CROSS-REFERENCE TO RELATED APPLICATIONS [0001] The present Application for Patent claims priority to pending U.S. Non- Provisional Application no. 17/370,993, filed July 8, 2021, and assigned to the assignee hereof and hereby expressly incorporated by reference herein as if fully set forth below and for all applicable purposes. Application No. 17/370,993 is related to co-filed U.S. Application No. 17/370,991 (Docket Ref No. 2103861U1) also filed on July 8, 2021, co filed U.S. Application No. 17/370,997 (Docket Ref. No. 2103861U3) also filed on July 8, 2021, and co-filed U.S. Application No. 17/371,003 (Docket Ref. No. 2104330) also filed on July 8, 2021.

TECHNICAL FIELD

[0002] The technology discussed below relates generally to wireless communication networks, and more particularly, to a sidelink cancellation indication for cancelling previously scheduled sidelink traffic.

BACKGROUND

[0003] Wireless communication between devices may be facilitated by various network configurations. In one configuration, a cellular network may enable user equipment (UEs) to communicate with one another through signaling with a nearby base station or cell. Another wireless communication network configuration is a device to device (D2D) network in which UEs may signal one another directly, rather than via an intermediary base station or cell. For example, D2D communication networks may utilize sidelink signaling to facilitate the direct communication between UEs over a proximity service (ProSe) PC5 interface. In some sidelink network configurations, UEs may further communicate in a cellular network, generally under the control of a base station. Thus, the UEs may be configured for uplink and downlink signaling via a base station and further for sidelink signaling directly between the UEs without transmissions passing through the base station.

[0004] Sidelink communication may be autonomously scheduled (e.g., self-scheduled) by the UEs or may be scheduled by the base station. For example, the base station may transmit sidelink scheduling information to schedule sidelink communication between UEs via downlink control information. In some examples, a common carrier may be shared between the sidelink network and the cellular network, such that the resources on the common carrier may be allocated for both sidelink communication and cellular communication (e.g., uplink and downlink communication). For example, the base station may schedule sidelink traffic on uplink resources utilized for both uplink transmissions and sidelink transmissions or on downlink resources utilized for both downlink transmissions and sidelink transmissions.

BRIEF SUMMARY OF SOME EXAMPLES

[0005] The following presents a summary of one or more aspects of the present disclosure, in order to provide a basic understanding of such aspects. This summary is not an extensive overview of all contemplated features of the disclosure and is intended neither to identify key or critical elements of all aspects of the disclosure nor to delineate the scope of any or all aspects of the disclosure. Its sole purpose is to present some concepts of one or more aspects of the disclosure in a form as a prelude to the more detailed description that is presented later.

[0006] In one example, a transmitting wireless communication device in a wireless communication network is disclosed. The transmitting wireless communication device includes a transceiver, a memory, and a processor coupled to the transceiver and the memory. The processor and the memory can be configured to receive sidelink scheduling information scheduling a sidelink transmission from the transmitting wireless communication device to a receiving wireless communication device from a network entity in the wireless communication network via the transceiver. The sidelink scheduling information can include scheduled resources for the sidelink transmission. The processor and the memory can further be configured to receive control information from the network entity via the transceiver. The control information can include a cancellation indication indicating at least overlapping resources between the scheduled resources and additional resources scheduled for an additional transmission. The processor and the memory can further be configured to cancel the sidelink transmission within cancelled resources comprising at least the overlapping resources, and transmit the sidelink transmission via the transceiver to the receiving wireless communication device via remaining resources of the scheduled resources outside of the cancelled resources.

[0007] Another example provides method for wireless communication at a transmitting wireless communication device in a wireless communication network. The method includes receiving sidelink scheduling information scheduling a sidelink transmission from the transmitting wireless communication device to a receiving wireless communication device from a network entity in the wireless communication network. The scheduling information can include scheduled resources for the sidelink transmission. The method further includes receiving control information from the network entity. The control information including a cancellation indication indicating at least overlapping resources between the scheduled resources and additional resources scheduled for an additional transmission. The method further includes cancelling the sidelink transmission within cancelled resources comprising at least the overlapping resources, and transmitting the sidelink transmission to the receiving wireless communication device via remaining resources of the scheduled resources outside of the cancelled resources.

[0008] Another example provides transmitting wireless communication device in a wireless communication network. The transmitting wireless communication device includes means for receiving sidelink scheduling information scheduling a sidelink transmission from the transmitting wireless communication device to a receiving wireless communication device from a network entity in the wireless communication network. The scheduling information can include scheduled resources for the sidelink transmission. The transmitting wireless communication device further includes means for receiving control information from the network entity. The control information can include a cancellation indication indicating at least overlapping resources between the scheduled resources and additional resources scheduled for an additional transmission. The transmitting wireless communication device further includes means for cancelling the sidelink transmission within cancelled resources comprising at least the overlapping resources, and means for transmitting the sidelink transmission to the receiving wireless communication device via remaining resources of the scheduled resources outside of the cancelled resources.

[0009] These and other aspects will become more fully understood upon a review of the detailed description, which follows. Other aspects, features, and examples will become apparent to those of ordinary skill in the art, upon reviewing the following description of specific, exemplary examples of in conjunction with the accompanying figures. While features may be discussed relative to certain examples and figures below, all examples can include one or more of the advantageous features discussed herein. In other words, while one or more examples may be discussed as having certain advantageous features, one or more of such features may also be used in accordance with the various examples discussed herein. In similar fashion, while exemplary examples may be discussed below as device, system, or method examples such exemplary examples can be implemented in various devices, systems, and methods.

BRIEF DESCRIPTION OF THE DRAWINGS

[0010] FIG. 1 is a diagram illustrating an example of a wireless radio access network according to some aspects.

[0011] FIG. 2 is a diagram illustrating an example of a frame structure for use in a wireless communication network according to some aspects.

[0012] FIG. 3 is a diagram illustrating an example of a wireless communication network employing sidelink communication according to some aspects.

[0013] FIGs. 4A and 4B are diagrams illustrating examples of sidelink slot structures according to some aspects.

[0014] FIG. 5 is a diagram illustrating an example of sidelink transmissions between wireless communication devices according to some aspects.

[0015] FIG. 6 illustrates an example of a wireless communication network configured to support industrial internet of things (IIoT) according to some aspects.

[0016] FIG. 7 is a signaling diagram illustrating exemplary signaling for sidelink cancellation according to some aspects.

[0017] FIG. 8 is a diagram illustrating an example of sidelink cancellation according to some aspects.

[0018] FIG. 9 is a diagram illustrating an example of downlink control information (DCI) carrying a cancellation indication according to some aspects.

[0019] FIG. 10 is a diagram illustrating an example of a resource region configuration for indicating overlapping resources according to some aspects.

[0020] FIG. 11 is a diagram illustrating an example of a preemption indication according to some aspects.

[0021] FIG. 12 is a diagram illustrating an example of DCI carrying scheduling information for a sidelink transmission according to some aspects.

[0022] FIG. 13 is a signaling diagram illustrating exemplary signaling for a sidelink transmission based on priority according to some aspects.

[0023] FIG. 14 is a signaling diagram illustrating exemplary signaling for feedback information based on priority according to some aspects.

[0024] FIG. 15 is a signaling diagram illustrating exemplary signaling for prioritized sidelink transmission according to some aspects. [0025] FIG. 16 is a diagram illustrating an example of a hard cancellation of resources allocated to a sidelink transmission according to some aspects.

[0026] FIG. 17 is a diagram illustrating an example of resumption of a sidelink transmission based on a hard cancellation of resources allocated to a sidelink transmission according to some aspects.

[0027] FIG. 18 is a diagram illustrating another example of resumption of a sidelink transmission based on a hard cancellation of resources allocated to a sidelink transmission according to some aspects.

[0028] FIG. 19 is a diagram illustrating another example of resumption of a sidelink transmission based on a hard cancellation of resources allocated to a sidelink transmission according to some aspects.

[0029] FIGs. 20A and 20B are diagrams illustrating other examples of resumption of a sidelink transmission based on a hard cancellation of resources allocated to a sidelink transmission according to some aspects.

[0030] FIG. 21 is a block diagram illustrating an example of a hardware implementation for a wireless communication device employing a processing system according to some aspects.

[0031] FIG. 22 is a flow chart of an exemplary method for sidelink cancellation at a wireless communication device according to some aspects.

[0032] FIG. 23 is a flow chart of another exemplary method for sidelink cancellation at a wireless communication device according to some aspects.

[0033] FIG. 24 is a flow chart of another exemplary method for sidelink cancellation at a wireless communication device according to some aspects.

[0034] FIG. 25 is a flow chart of an exemplary method for sidelink prioritization at a wireless communication device according to some aspects.

[0035] FIG. 26 is a block diagram illustrating an example of a hardware implementation for a network entity employing a processing system according to some aspects.

[0036] FIG. 27 is a flow chart of an exemplary method for sidelink cancellation at a network entity according to some aspects.

[0037] FIG. 28 is a flow chart illustrating an exemplary method for sidelink prioritization at a network entity according to some aspects.

DETAILED DESCRIPTION [0038] The detailed description set forth below in connection with the appended drawings is intended as a description of various configurations and is not intended to represent the only configurations in which the concepts described herein may be practiced. The detailed description includes specific details for the purpose of providing a thorough understanding of various concepts. However, it will be apparent to those skilled in the art that these concepts may be practiced without these specific details. In some instances, well known structures and components are shown in block diagram form in order to avoid obscuring such concepts.

[0039] Various aspects of the disclosure relate to techniques for facilitating sidelink cancellation to improve flexibility in scheduling higher priority traffic, such as ultra reliable low-latency communication (URLLC) uplink or sidelink traffic. A network entity, such as a base station, may schedule a sidelink transmission between a transmitting wireless communication device (e.g., a transmitting UE) and a receiving wireless communication device (e.g., a receiving UE). The network entity may then transmit scheduling information for the sidelink transmission to the transmitting UE or both the transmitting UE and the receiving UE. The scheduling information may include, for example, resources (e.g., time-frequency resources) allocated to the sidelink transmission. In some examples, the scheduling information may be transmitted within downlink control information (DCI), such as DCI 3_0 format.

[0040] The network entity may then schedule an additional transmission (e.g., a sidelink transmission or an uplink transmission) within at least a portion of the resources allocated to the sidelink transmission. The additional transmission may have a higher priority than the sidelink transmission. The network entity may further transmit control information including a cancellation indication to the transmitting UE or both the transmitting UE and the receiving UE. The cancellation indication may indicate at least an overlap between the portion of the resources allocated to the sidelink transmission and the additional transmission. Based on the cancellation indication, the transmitting UE may modify the sidelink transmission. In some examples, the transmitting UE may further transmit a preemption indication to the receiving UE informing the UE of the modification(s) made to the sidelink transmission to enable decoding of the modified sidelink transmission at the receiving UE.

[0041] Various aspects of the disclosure further relate to techniques for enhancing sidelink scheduling information to include a priority assigned to the sidelink transmission. For example, the DCI (e.g., DCI 3_0) may include a priority indicator indicating a priority assigned to the scheduled sidelink transmission. The priority indicator may facilitate intra-UE sidelink prioritization and/or intra-UE sidelink and uplink prioritization. For example, the transmitting UE may utilize the respective priority indicators received for each scheduled sidelink/uplink transmission to prioritize between the sidelink/uplink transmissions in examples in which there is an overlap between the resources allocated for each of the sidelink/uplink transmissions. The priority indicator may further facilitate hybrid automatic repeat request (HARQ) codebook construction on the sidelink and uplink for different priorities. Aspects further relate to including a power control parameter associated with the priority indicator in the scheduling information for the sidelink transmission (e.g., DCI 3_0). The power control parameter may indicate a transmission power for the sidelink transmission based on the assigned priority. For example, the power control parameter may indicate to boost the transmission power for high priority sidelink transmissions.

[0042] Other aspects of the disclosure relate to techniques for facilitating resumption of the sidelink transmission within resources outside of overlapping resources between the sidelink transmission and the additional transmission. For example, resumption may occur within non-overlapping time resources (e.g., symbols) and/or non-overlapping frequency resources. An additional reference signal may be included within at least a resumed portion of the sidelink transmission for phase continuity and/or an additional automatic gain control (AGC) symbol may be included within the resumed sidelink transmission for AGC calibration.

[0043] While aspects and examples are described in this application by illustration to some examples, those skilled in the art will understand that additional implementations and use cases may come about in many different arrangements and scenarios. Innovations described herein may be implemented across many differing platform types, devices, systems, shapes, sizes, and packaging arrangements. For example, aspects and/or uses may come about via integrated chip examples and other non-module-component based devices (e.g., end-user devices, vehicles, communication devices, computing devices, industrial equipment, retail/purchasing devices, medical devices, AI-enabled devices, etc.). While some examples may or may not be specifically directed to use cases or applications, a wide assortment of applicability of described innovations may occur. Implementations may range a spectrum from chip-level or modular components to non- modular, non-chip-level implementations and further to aggregate, distributed, or OEM devices or systems incorporating one or more aspects of the described innovations. In some practical settings, devices incorporating described aspects and features may also necessarily include additional components and features for implementation and practice of claimed and described examples. For example, transmission and reception of wireless signals necessarily includes a number of components for analog and digital purposes (e.g., hardware components including antenna, RF-chains, power amplifiers, modulators, buffer, processor(s), interleaver, adders/summers, etc.). It is intended that innovations described herein may be practiced in a wide variety of devices, chip-level components, systems, distributed arrangements, end-user devices, etc. of varying sizes, shapes, and constitution.

[0044] The various concepts presented throughout this disclosure may be implemented across a broad variety of telecommunication systems, network architectures, and communication standards. Referring now to FIG. 1, as an illustrative example without limitation, a schematic illustration of a radio access network 100 is provided. The RAN 100 may implement any suitable wireless communication technology or technologies to provide radio access. As one example, the RAN 100 may operate according to 3 ^rd Generation Partnership Project (3GPP) New Radio (NR) specifications, often referred to as 5G. As another example, the RAN 100 may operate under a hybrid of 5G NR and Evolved Universal Terrestrial Radio Access Network (eUTRAN) standards, often referred to as LTE. The 3GPP refers to this hybrid RAN as a next-generation RAN, or NG-RAN. Of course, many other examples may be utilized within the scope of the present disclosure.

[0045] The geographic region covered by the radio access network 100 may be divided into a number of cellular regions (cells) that can be uniquely identified by a user equipment (UE) based on an identification broadcasted over a geographical area from one access point or base station. FIG. 1 illustrates cells 102, 104, 106, and cell 108, each of which may include one or more sectors (not shown). A sector is a sub-area of a cell. All sectors within one cell are served by the same base station. A radio link within a sector can be identified by a single logical identification belonging to that sector. In a cell that is divided into sectors, the multiple sectors within a cell can be formed by groups of antennas with each antenna responsible for communication with UEs in a portion of the cell.

[0046] In general, a respective base station (BS) serves each cell. Broadly, a base station is a network element in a radio access network responsible for radio transmission and reception in one or more cells to or from a UE. A BS may also be referred to by those skilled in the art as a base transceiver station (BTS), a radio base station, a radio transceiver, a transceiver function, a basic service set (BSS), an extended service set (ESS), an access point (AP), a Node B (NB), an eNode B (eNB), a gNode B (gNB), a transmission and reception point (TRP), or some other suitable terminology. In some examples, a base station may include two or more TRPs that may be collocated or non- collocated. Each TRP may communicate on the same or different carrier frequency within the same or different frequency band. In examples where the RAN 100 operates according to both the LTE and 5G NR standards, one of the base stations may be an LTE base station, while another base station may be a 5G NR base station.

[0047] Various base station arrangements can be utilized. For example, in FIG. 1, two base stations 110 and 112 are shown in cells 102 and 104; and a third base station 114 is shown controlling a remote radio head (RRH) 116 in cell 106. That is, a base station can have an integrated antenna or can be connected to an antenna or RRH by feeder cables. In the illustrated example, the cells 102, 104, and 106 may be referred to as macrocells, as the base stations 110, 112, and 114 support cells having a large size. Further, a base station 118 is shown in the cell 108 which may overlap with one or more macrocells. In this example, the cell 108 may be referred to as a small cell (e.g., a microcell, picocell, femtocell, home base station, home Node B, home eNode B, etc.), as the base station 118 supports a cell having a relatively small size. Cell sizing can be done according to system design as well as component constraints.

[0048] It is to be understood that the radio access network 100 may include any number of wireless base stations and cells. Further, a relay node may be deployed to extend the size or coverage area of a given cell. The base stations 110, 112, 114, 118 provide wireless access points to a core network for any number of mobile apparatuses.

[0049] FIG. 1 further includes an unmanned aerial vehicle (UAV) 120, which may be a drone or quadcopter. The UAV 120 may be configured to function as a base station, or more specifically as a mobile base station. That is, in some examples, a cell may not necessarily be stationary, and the geographic area of the cell may move according to the location of a mobile base station such as the UAV 120.

[0050] In general, base stations may include a backhaul interface for communication with a backhaul portion (not shown) of the network. The backhaul may provide a link between a base station and a core network (not shown), and in some examples, the backhaul may provide interconnection between the respective base stations. The core network may be a part of a wireless communication system and may be independent of the radio access technology used in the radio access network. Various types of backhaul interfaces may be employed, such as a direct physical connection, a virtual network, or the like using any suitable transport network.

[0051] The RAN 100 is illustrated supporting wireless communication for multiple mobile apparatuses. A mobile apparatus is commonly referred to as user equipment (UE) in standards and specifications promulgated by the 3rd Generation Partnership Project (3GPP), but may also be referred to by those skilled in the art as a mobile station (MS), a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communications device, a remote device, a mobile subscriber station, an access terminal (AT), a mobile terminal, a wireless terminal, a remote terminal, a handset, a terminal, a user agent, a mobile client, a client, or some other suitable terminology. A UE may be an apparatus that provides a user with access to network services.

[0052] Within the present document, a “mobile” apparatus need not necessarily have a capability to move, and may be stationary. The term mobile apparatus or mobile device broadly refers to a diverse array of devices and technologies. For example, some non limiting examples of a mobile apparatus include a mobile, a cellular (cell) phone, a smart phone, a session initiation protocol (SIP) phone, a laptop, a personal computer (PC), a notebook, a netbook, a smartbook, a tablet, a personal digital assistant (PDA), and a broad array of embedded systems, e.g., corresponding to an “Internet of things” (IoT). A mobile apparatus may additionally be an automotive or other transportation vehicle, a remote sensor or actuator, a robot or robotics device, a satellite radio, a global positioning system (GPS) device, an object tracking device, a drone, a multi-copter, a quad-copter, a remote control device, a consumer and/or wearable device, such as eyewear, a wearable camera, a virtual reality device, a smart watch, a health or fitness backer, a digital audio player (e.g., MP3 player), a camera, a game console, etc. A mobile apparatus may additionally be a digital home or smart home device such as a home audio, video, and/or multimedia device, an appliance, a vending machine, intelligent lighting, a home security system, a smart meter, etc. A mobile apparatus may additionally be a smart energy device, a security device, a solar panel or solar array, a municipal infrasbucture device controlling electric power (e.g., a smart grid), lighting, water, etc., an industrial automation and enterprise device, a logistics conboller, agricultural equipment, etc. Still further, a mobile apparatus may provide for connected medicine or telemedicine support, i.e., health care at a distance. Telehealth devices may include telehealth monitoring devices and telehealth administration devices, whose communication may be given preferential treatment or prioritized access over other types of information, e.g., in ter s of prioritized access for transport of critical service data, and/or relevant QoS for transport of critical service data.

[0053] Within the RAN 100, the cells may include UEs that may be in communication with one or more sectors of each cell. For example, UEs 122 and 124 may be in communication with base station 110; UEs 126 and 128 may be in communication with base station 112; UEs 130 and 132 may be in communication with base station 114 by way of RRH 116; UE 134 may be in communication with base station 118; and UE 136 may be in communication with mobile base station 120. Here, each base station 110, 112, 114, 118, and 120 may be configured to provide an access point to a core network (not shown) for all the UEs in the respective cells. In some examples, the UAV 120 (e.g., the quadcopter) can be a mobile network node and may be configured to function as a UE. For example, the UAV 120 may operate within cell 102 by communicating with base station 110.

[0054] Wireless communication between a RAN 100 and a UE (e.g., UE 122 or 124) may be described as utilizing an air interface. Transmissions over the air interface from a base station (e.g., base station 110) to one or more UEs (e.g., UE 122 and 124) may be referred to as downlink (DL) transmission. In accordance with certain aspects of the present disclosure, the term downlink may refer to a point-to-multipoint transmission originating at a scheduling entity (described further below; e.g., base station 110). Another way to describe this scheme may be to use the term broadcast channel multiplexing. Transmissions from a UE (e.g., UE 122) to a base station (e.g., base station 110) may be referred to as uplink (UL) transmissions. In accordance with further aspects of the present disclosure, the term uplink may refer to a point-to-point transmission originating at a scheduled entity (described further below; e.g., UE 122).

[0055] For example, DL transmissions may include unicast or broadcast transmissions of control information and/or traffic information (e.g., user data traffic) from a base station (e.g., base station 110) to one or more UEs (e.g., UEs 122 and 124), while UL transmissions may include transmissions of control information and/or traffic information originating at a UE (e.g., UE 122). In addition, the uplink and/or downlink control information and/or traffic information may be time-divided into frames, subframes, slots, and/or symbols. As used herein, a symbol may refer to a unit of time that, in an orthogonal frequency division multiplexed (OFDM) waveform, carries one resource element (RE) per sub-carrier. A slot may carry 7 or 14 OFDM symbols. A subframe may refer to a duration of 1ms. Multiple subframes or slots may be grouped together to form a single frame or radio frame. Within the present disclosure, a frame may refer to a predetermined duration (e.g., 10 ms) for wireless transmissions, with each frame consisting of, for example, 10 subframes of 1 ms each. Of course, these definitions are not required, and any suitable scheme for organizing waveforms may be utilized, and various time divisions of the waveform may have any suitable duration.

[0056] In some examples, access to the air interface may be scheduled, wherein a scheduling entity (e.g., a base station) allocates resources (e.g., time-frequency resources) for communication among some or all devices and equipment within its service area or cell. Within the present disclosure, as discussed further below, the scheduling entity may be responsible for scheduling, assigning, reconfiguring, and releasing resources for one or more scheduled entities. That is, for scheduled communication, UEs or scheduled entities utilize resources allocated by the scheduling entity.

[0057] Base stations are not the only entities that may function as a scheduling entity.

That is, in some examples, a UE may function as a scheduling entity, scheduling resources for one or more scheduled entities (e.g., one or more other UEs). For example, two or more UEs (e.g., UEs 138, 140, and 142) may communicate with each other using sidelink signals 137 without relaying that communication through a base station. In some examples, the UEs 138, 140, and 142 may each function as a scheduling entity or transmitting sidelink device and/or a scheduled entity or a receiving sidelink device to schedule resources and communicate sidelink signals 137 therebetween without relying on scheduling or control information from a base station. In other examples, two or more UEs (e.g., UEs 126 and 128) within the coverage area of a base station (e.g., base station 112) may also communicate sidelink signals 127 over a direct link (sidelink) without conveying that communication through the base station 112. In this example, the base station 112 may allocate resources to the UEs 126 and 128 for the sidelink communication. In either case, such sidelink signaling 127 and 137 may be implemented in a peer-to-peer (P2P) network, a device-to-device (D2D) network, a vehicle-to-vehicle (V2V) network, a vehicle-to-everything (V2X) network, a mesh network, or other suitable direct link network.

[0058] In some examples, a D2D relay framework may be included within a cellular network to facilitate relaying of communication to/from the base station 112 via D2D links (e.g., sidelinks 127 or 137). For example, one or more UEs (e.g., UE 128) within the coverage area of the base station 112 may operate as relaying UEs to extend the coverage of the base station 112, improve the transmission reliability to one or more UEs (e.g., UE 126), and/or to allow the base station to recover from a failed UE link due to, for example, blockage or fading.

[0059] Two primary technologies that may be used by V2X networks include dedicated short range communication (DSRC) based on IEEE 802. lip standards and cellular V2X based on LTE and/or 5G (New Radio) standards. Various aspects of the present disclosure may relate to New Radio (NR) cellular V2X networks, referred to herein as V2X networks, for simplicity. However, it should be understood that the concepts disclosed herein may not be limited to a particular V2X standard or may be directed to sidelink networks other than V2X networks.

[0060] In order for transmissions over the air interface to obtain a low block error rate (BLER) while still achieving very high data rates, channel coding may be used. That is, wireless communication may generally utilize a suitable error correcting block code. In a typical block code, an information message or sequence is split up into code blocks (CBs), and an encoder (e.g., a CODEC) at the transmitting device then mathematically adds redundancy to the information message. Exploitation of this redundancy in the encoded information message can improve the reliability of the message, enabling correction for any bit errors that may occur due to the noise.

[0061] Data coding may be implemented in multiple manners. In early 5G NR specifications, user data is coded using quasi-cyclic low-density parity check (LDPC) with two different base graphs: one base graph is used for large code blocks and/or high code rates, while the other base graph is used otherwise. Control information and the physical broadcast channel (PBCH) are coded using Polar coding, based on nested sequences. For these channels, puncturing, shortening, and repetition are used for rate matching.

[0062] Aspects of the present disclosure may be implemented utilizing any suitable channel code. Various implementations of base stations and UEs may include suitable hardware and capabilities (e.g., an encoder, a decoder, and/or a CODEC) to utilize one or more of these channel codes for wireless communication.

[0063] In the RAN 100, the ability for a UE to communicate while moving, independent of their location, is referred to as mobility. The various physical channels between the UE and the RAN are generally set up, maintained, and released under the control of an access and mobility management function (AMF). In some scenarios, the AMF may include a security context management function (SCMF) and a security anchor function (SEAF) that performs authentication. The SCMF can manage, in whole or in part, the security context for both the control plane and the user plane functionality.

[0064] In some examples, a RAN 100 may enable mobility and handovers (i.e., the transfer of a UE’s connection from one radio channel to another). For example, during a call with a scheduling entity, or at any other time, a UE may monitor various parameters of the signal from its serving cell as well as various parameters of neighboring cells. Depending on the quality of these parameters, the UE may maintain communication with one or more of the neighboring cells. During this time, if the UE moves from one cell to another, or if signal quality from a neighboring cell exceeds that from the serving cell for a given amount of time, the UE may undertake a handoff or handover from the serving cell to the neighboring (target) cell. For example, UE 124 may move from the geographic area corresponding to its serving cell 102 to the geographic area corresponding to a neighbor cell 106. When the signal strength or quality from the neighbor cell 106 exceeds that of its serving cell 102 for a given amount of time, the UE 124 may transmit a reporting message to its serving base station 110 indicating this condition. In response, the UE 124 may receive a handover command, and the UE may undergo a handover to the cell 106.

[0065] In various implementations, the air interface in the RAN 100 may utilize licensed spectrum, unlicensed spectrum, or shared spectrum. Licensed spectrum provides for exclusive use of a portion of the spectrum, generally by virtue of a mobile network operator purchasing a license from a government regulatory body. Unlicensed spectrum provides for shared use of a portion of the spectrum without need for a government- granted license. While compliance with some technical rules is generally still required to access unlicensed spectrum, generally, any operator or device may gain access. Shared spectrum may fall between licensed and unlicensed spectrum, wherein technical rules or limitations may be required to access the spectrum, but the spectrum may still be shared by multiple operators and/or multiple RATs. For example, the holder of a license for a portion of licensed spectrum may provide licensed shared access (LSA) to share that spectrum with other parties, e.g., with suitable licensee-determined conditions to gain access.

[0066] The air interface in the RAN 100 may utilize one or more multiplexing and multiple access algorithms to enable simultaneous communication of the various devices. For example, 5G NR specifications provide multiple access for UL or reverse link transmissions from UEs 122 and 124 to base station 110, and for multiplexing DL or forward link transmissions from the base station 110 to UEs 122 and 124 utilizing orthogonal frequency division multiplexing (OFDM) with a cyclic prefix (CP). In addition, for UL transmissions, 5G NR specifications provide support for discrete Fourier transform-spread-OFDM (DFT-s-OFDM) with a CP (also referred to as single-carrier FDMA (SC-FDMA)). However, within the scope of the present disclosure, multiplexing and multiple access are not limited to the above schemes, and may be provided utilizing time division multiple access (TDMA), code division multiple access (CDMA), frequency division multiple access (FDMA), sparse code multiple access (SCMA), resource spread multiple access (RSMA), or other suitable multiple access schemes. Further, multiplexing DL transmissions from the base station 110 to UEs 122 and 124 may be provided utilizing time division multiplexing (TDM), code division multiplexing (CDM), frequency division multiplexing (FDM), orthogonal frequency division multiplexing (OFDM), sparse code multiplexing (SCM), or other suitable multiplexing schemes.

[0067] Further, the air interface in the RAN 100 may utilize one or more duplexing algorithms. Duplex refers to a point-to-point communication link where both endpoints can communicate with one another in both directions. Full-duplex means both endpoints can simultaneously communicate with one another. Half-duplex means only one endpoint can send information to the other at a time. Half-duplex emulation is frequently implemented for wireless links utilizing time division duplex (TDD). In TDD, transmissions in different directions on a given channel are separated from one another using time division multiplexing. That is, at some times the channel is dedicated for transmissions in one direction, while at other times the channel is dedicated for transmissions in the other direction, where the direction may change very rapidly, e.g., several times per slot. In a wireless link, a full-duplex channel generally relies on physical isolation of a transmitter and receiver, and suitable interference cancellation technologies. Full-duplex emulation is frequently implemented for wireless links by utilizing frequency division duplex (FDD) or spatial division duplex (SDD). In FDD, transmissions in different directions may operate at different carrier frequencies (e.g., within paired spectrum). In SDD, transmissions in different directions on a given channel are separated from one another using spatial division multiplexing (SDM). In other examples, full- duplex communication may be implemented within unpaired spectrum (e.g., within a single carrier bandwidth), where transmissions in different directions occur within different sub-bands of the carrier bandwidth. This type of full-duplex communication may be referred to herein as sub-band full duplex (SBFD), also known as flexible duplex. [0068] Various aspects of the present disclosure will be described with reference to an OFDM waveform, schematically illustrated in FIG. 2. It should be understood by those of ordinary skill in the art that the various aspects of the present disclosure may be applied to an SC-FDMA waveform in substantially the same way as described herein below. That is, while some examples of the present disclosure may focus on an OFDM link for clarity, it should be understood that the same principles may be applied as well to SC-FDMA waveforms.

[0069] Referring now to FIG. 2, an expanded view of an exemplary subframe 202 is illustrated, showing an OFDM resource grid. However, as those skilled in the art will readily appreciate, the PHY transmission structure for any particular application may vary from the example described here, depending on any number of factors. Here, time is in the horizontal direction with units of OFDM symbols; and frequency is in the vertical direction with units of subcarriers of the carrier.

[0070] The resource grid 204 may be used to schematically represent time-frequency resources for a given antenna port. That is, in a multiple-input-multiple-output (MIMO) implementation with multiple antenna ports available, a corresponding multiple number of resource grids 204 may be available for communication. The resource grid 204 is divided into multiple resource elements (REs) 206. An RE, which is 1 subcarrier x 1 symbol, is the smallest discrete part of the time-frequency grid, and contains a single complex value representing data from a physical channel or signal. Depending on the modulation utilized in a particular implementation, each RE may represent one or more bits of information. In some examples, a block of REs may be referred to as a physical resource block (PRB) or more simply a resource block (RB) 208, which contains any suitable number of consecutive subcarriers in the frequency domain. In one example, an RB may include 12 subcarriers, a number independent of the numerology used. In some examples, depending on the numerology, an RB may include any suitable number of consecutive OFDM symbols in the time domain. Within the present disclosure, it is assumed that a single RB such as the RB 208 entirely corresponds to a single direction of communication (either transmission or reception for a given device).

[0071] A set of continuous or discontinuous resource blocks may be referred to herein as a Resource Block Group (RBG), sub-band, or bandwidth part (BWP). A set of sub-bands or BWPs may span the entire bandwidth. Scheduling of UEs or sidelink devices (hereinafter collectively referred to as UEs) for downlink, uplink, or sidelink transmissions typically involves scheduling one or more resource elements 206 within one or more sub-bands or bandwidth parts (BWPs). Thus, a UE generally utilizes only a subset of the resource grid 204. In some examples, an RB may be the smallest unit of resources that can be allocated to a UE. Thus, the more RBs scheduled for a UE, and the higher the modulation scheme chosen for the air interface, the higher the data rate for the UE. The RBs may be scheduled by a base station (e.g., gNB, eNB, etc.) or may be self- scheduled by a UE/sidelink device implementing D2D sidelink communication.

[0072] In this illustration, the RB 208 is shown as occupying less than the entire bandwidth of the subframe 202, with some subcarriers illustrated above and below the RB 208. In a given implementation, the subframe 202 may have a bandwidth corresponding to any number of one or more RBs 208. Further, in this illustration, the RB 208 is shown as occupying less than the entire duration of the subframe 202, although this is merely one possible example.

[0073] Each 1 ms subframe 202 may consist of one or multiple adjacent slots. In the example shown in FIG. 2, one subframe 202 includes four slots 210, as an illustrative example. In some examples, a slot may be defined according to a specified number of OFDM symbols with a given cyclic prefix (CP) length. For example, a slot may include 7 or 12 OFDM symbols with a nominal CP. Additional examples may include mini-slots, sometimes referred to as shortened transmission time intervals (TTIs), having a shorter duration (e.g., one to three OFDM symbols). These mini-slots or shortened transmission time intervals (TTIs) may in some cases be transmitted occupying resources scheduled for ongoing slot transmissions for the same or for different UEs. Any number of resource blocks may be utilized within a subframe or slot.

[0074] An expanded view of one of the slots 210 illustrates the slot 210 including a control region 212 and a data region 214. In general, the control region 212 may carry control channels, and the data region 214 may carry data channels. Of course, a slot may contain all DF, all UE, or at least one DF portion and at least one UE portion. The structure illustrated in FIG. 2 is merely exemplary in nature, and different slot structures may be utilized, and may include one or more of each of the control region(s) and data region(s).

[0075] Although not illustrated in FIG. 2, the various REs 206 within a RB 208 may be scheduled to carry one or more physical channels, including control channels, shared channels, data channels, etc. Other REs 206 within the RB 208 may also carry pilots or reference signals. These pilots or reference signals may provide for a receiving device to perform channel estimation of the corresponding channel, which may enable coherent demodulation/detection of the control and/or data channels within the RB 208.

[0076] In some examples, the slot 210 may be utilized for broadcast, multicast, groupcast, or unicast communication. For example, a broadcast, multicast, or groupcast communication may refer to a point-to-multipoint transmission by one device (e.g., a base station, UE, or other similar device) to other devices. Here, a broadcast communication is delivered to all devices, whereas a multicast or groupcast communication is delivered to multiple intended recipient devices. A unicast communication may refer to a point-to- point transmission by a one device to a single other device.

[0077] In an example of cellular communication over a cellular carrier via a Uu interface, for a DL transmission, the scheduling entity (e.g., a base station) may allocate one or more REs 206 (e.g., within the control region 212) to carry DL control information including one or more DL control channels, such as a physical downlink control channel (PDCCH), to one or more scheduled entities (e.g., UEs). The PDCCH carries downlink control information (DCI) including but not limited to power control commands (e.g., one or more open loop power control parameters and/or one or more closed loop power control parameters), scheduling information, a grant, and/or an assignment of REs for DL and UL transmissions. The PDCCH may further carry HARQ feedback transmissions such as an acknowledgment (ACK) or negative acknowledgment (NACK). HARQ is a technique well-known to those of ordinary skill in the art, wherein the integrity of packet transmissions may be checked at the receiving side for accuracy, e.g., utilizing any suitable integrity checking mechanism, such as a checksum or a cyclic redundancy check (CRC). If the integrity of the transmission is confirmed, an ACK may be transmitted, whereas if not confirmed, a NACK may be transmitted. In response to a NACK, the transmitting device may send a HARQ retransmission, which may implement chase combining, incremental redundancy, etc.

[0078] The base station may further allocate one or more REs 206 (e.g., in the control region 212 or the data region 214) to carry other DL signals, such as a demodulation reference signal (DMRS); a phase-tracking reference signal (PT-RS); a channel state information (CSI) reference signal (CSI-RS); and a synchronization signal block (SSB). SSBs may be broadcast at regular intervals based on a periodicity (e.g., 5, 10, 20, 20, 80, or 120 ms). An SSB includes a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a physical broadcast control channel (PBCH). A UE may utilize the PSS and SSS to achieve radio frame, subframe, slot, and symbol synchronization in the time domain, identify the center of the channel (system) bandwidth in the frequency domain, and identify the physical cell identity (PCI) of the cell.

[0079] The PBCH in the SSB may further include a master information block (MIB) that includes various system information, along with parameters for decoding a system information block (SIB). The SIB may be, for example, a SystemlnformationType 1 (SIB1) that may include various additional system information. The MIB and SIB1 together provide the minimum system information (SI) for initial access. Examples of system information transmitted in the MIB may include, but are not limited to, a subcarrier spacing (e.g., default downlink numerology), system frame number, a configuration of a PDCCH control resource set (CORESET) (e.g., PDCCH CORESETO), a cell barred indicator, a cell reselection indicator, a raster offset, and a search space for SIB1. Examples of remaining minimum system information (RMSI) transmitted in the SIB 1 may include, but are not limited to, a random access search space, a paging search space, downlink configuration information, and uplink configuration information.

[0080] In an UL transmission, the scheduled entity (e.g., UE) may utilize one or more REs 206 to carry UL control information (UCI) including one or more UL control channels, such as a physical uplink control channel (PUCCH), to the scheduling entity. UCI may include a variety of packet types and categories, including pilots, reference signals, and information configured to enable or assist in decoding uplink data transmissions. Examples of uplink reference signals may include a sounding reference signal (SRS) and an uplink DMRS. In some examples, the UCI may include a scheduling request (SR), i.e., request for the scheduling entity to schedule uplink transmissions. Here, in response to the SR transmitted on the UCI, the scheduling entity may transmit downlink control information (DCI) that may schedule resources for uplink packet transmissions. UCI may also include HARQ feedback, channel state feedback (CSF), such as a CSI report, or any other suitable UCI.

[0081] In addition to control information, one or more REs 206 (e.g., within the data region 214) may be allocated for data traffic. Such data traffic may be carried on one or more traffic channels, such as, for a DL transmission, a physical downlink shared channel (PDSCH); or for an UL transmission, a physical uplink shared channel (PUSCH). In some examples, one or more REs 206 within the data region 214 may be configured to carry other signals, such as one or more SIBs and DMRSs.

[0082] In an example of sidelink communication over a sidelink carrier via a PC5 interface, the control region 212 of the slot 210 may include a physical sidelink control channel (PSCCH) including sidelink control information (SCI) transmitted by an initiating (transmitting) sidelink device (e.g., Tx V2X device or other Tx UE) towards a set of one or more other receiving sidelink devices (e.g., Rx V2X device or other Rx UE). The data region 214 of the slot 210 may include a physical sidelink shared channel (PSSCH) including sidelink data traffic transmitted by the initiating (transmitting) sidelink device within resources reserved over the sidelink carrier by the transmitting sidelink device via the SCI. Other information may further be transmitted over various REs 206 within slot 210. For example, HARQ feedback information may be transmitted in a physical sidelink feedback channel (PSFCH) within the slot 210 from the receiving sidelink device to the transmitting sidelink device. In addition, one or more reference signals, such as a sidelink SSB, a sidelink CSI-RS, a sidelink SRS, and/or a sidelink positioning reference signal (PRS) may be transmitted within the slot 210.

[0083] These physical channels described above are generally multiplexed and mapped to transport channels for handling at the medium access control (MAC) layer. Transport channels carry blocks of information called transport blocks (TB). The transport block size (TBS), which may correspond to a number of bits of information, may be a controlled parameter, based on the modulation and coding scheme (MCS) and the number of RBs in a given transmission.

[0084] The channels or carriers illustrated in FIG. 2 are not necessarily all of the channels or carriers that may be utilized between devices, and those of ordinary skill in the art will recognize that other channels or carriers may be utilized in addition to those illustrated, such as other traffic, control, and feedback channels.

[0085] FIG. 3 illustrates an example of a wireless communication network 300 configured to support D2D or sidelink communication. In some examples, sidelink communication may include V2X communication. V2X communication involves the wireless exchange of information directly between not only vehicles (e.g., vehicles 302 and 304) themselves, but also directly between vehicles 302/304 and infrastructure (e.g., roadside units (RSUs) 306), such as streetlights, buildings, traffic cameras, tollbooths or other stationary objects, vehicles 302/304 and pedestrians 308, and vehicles 302/304 and wireless communication networks (e.g., base station 310). In some examples, V2X communication may be implemented in accordance with the New Radio (NR) cellular V2X standard defined by 3GPP, Release 16, or other suitable standard.

[0086] V2X communication enables vehicles 302 and 304 to obtain information related to the weather, nearby accidents, road conditions, activities of nearby vehicles and pedestrians, objects nearby the vehicle, and other pertinent information that may be utilized to improve the vehicle driving experience and increase vehicle safety. For example, such V2X data may enable autonomous driving and improve road safety and traffic efficiency. For example, the exchanged V2X data may be utilized by a V2X connected vehicle 302 and 304 to provide in-vehicle collision warnings, road hazard warnings, approaching emergency vehicle warnings, pre-/post-crash warnings and information, emergency brake warnings, traffic jam ahead warnings, lane change warnings, intelligent navigation services, and other similar information. In addition, V2X data received by a V2X connected mobile device of a pedestrian/cyclist 308 may be utilized to trigger a warning sound, vibration, flashing light, etc., in case of imminent danger.

[0087] The sidelink communication between vehicle-UEs (V-UEs) 302 and 304 or between a V-UE 302 or 304 and either an RSU 306 or a pedestrian-UE (P-UE) 308 may occur over a sidelink 312 utilizing a proximity service (ProSe) PC5 interface. In various aspects of the disclosure, the PC5 interface may further be utilized to support D2D sidelink 312 communication in other proximity use cases (e.g., other than V2X). Examples of other proximity use cases may include smart wearables, public safety, or commercial (e.g., entertainment, education, office, medical, and/or interactive) based proximity services. In the example shown in FIG. 3, ProSe communication may further occur between UEs 314 and 316.

[0088] ProSe communication may support different operational scenarios, such as in coverage, out-of-coverage, and partial coverage. Out-of-coverage refers to a scenario in which UEs (e.g., UEs 314 and 316) are outside of the coverage area of a base station (e.g., base station 310), but each are still configured for ProSe communication. Partial coverage refers to a scenario in which some of the UEs (e.g., V-UE 304) are outside of the coverage area of the base station 310, while other UEs (e.g., V-UE 302 and P-UE 308) are in communication with the base station 310. In-coverage refers to a scenario in which UEs (e.g., V-UE 302 and P-UE 308) are in communication with the base station 310 (e.g., gNB) via a Uu (e.g., cellular interface) connection to receive ProSe service authorization and provisioning information to support ProSe operations.

[0089] To facilitate D2D sidelink communication between, for example, UEs 314 and 316 over the sidelink 312, the UEs 314 and 316 may transmit discovery signals therebetween. In some examples, each discovery signal may include a synchronization signal, such as a primary synchronization signal (PSS) and/or a secondary synchronization signal (SSS) that facilitates device discovery and enables synchronization of communication on the sidelink 312. For example, the discovery signal may be utilized by the UE 316 to measure the signal strength and channel status of a potential sidelink (e.g., sidelink 312) with another UE (e.g., UE 314). The UE 316 may utilize the measurement results to select a UE (e.g., UE 314) for sidelink communication or relay communication.

[0090] In 5G NR sidelink, sidelink communication may utilize transmission or reception resource pools. For example, the minimum resource allocation unit in frequency may be a sub-channel (e.g., which may include, for example, 10, 15, 20, 25, 50, 75, or 100 consecutive resource blocks) and the minimum resource allocation unit in time may be one slot. The number of sub-channels in a resource pool may include between one and twenty-seven sub-channels. A radio resource control (RRC) configuration of the resource pools may be either pre-configured (e.g., a factory setting on the UE determined, for example, by sidelink standards or specifications) or configured by a base station (e.g., base station 310).

[0091] In addition, there may be two main resource allocation modes of operation for sidelink (e.g., PC5) communications. In a first mode, Mode 1, a base station (e.g., gNB) 310 may allocate resources to sidelink devices (e.g., V2X devices or other sidelink devices) for sidelink communication between the sidelink devices in various manners. For example, the base station 310 may allocate sidelink resources dynamically (e.g., a dynamic grant) to sidelink devices, in response to requests for sidelink resources from the sidelink devices. For example, the base station 310 may schedule the sidelink communication via DCI 3_0. In some examples, the base station 310 may schedule the PSCCF1/PSSCF1 within uplink resources indicated in DCI 3_0. The base station 310 may further activate preconfigured sidelink grants (e.g., configured grants) for sidelink communication among the sidelink devices. In some examples, the base station 310 may activate a configured grant (CG) via RRC signaling. In Mode 1 , sidelink feedback may be reported back to the base station 310 by a transmitting sidelink device.

[0092] In a second mode, Mode 2, the sidelink devices may autonomously select sidelink resources for sidelink communication therebetween. In some examples, a transmitting sidelink device may perform resource/channel sensing to select resources (e.g., sub channels) on the sidelink channel that are unoccupied. Signaling on the sidelink is the same between the two modes. Therefore, from a receiver’s point of view, there is no difference between the modes. [0093] In some examples, sidelink (e.g., PC5) communication may be scheduled by use of sidelink control information (SCI). SCI may include two SCI stages. Stage 1 sidelink control information (first stage SCI) may be referred to herein as SCI-1. Stage 2 sidelink control information (second stage SCI) may be referred to herein as SCI-2.

[0094] SCI-1 may be transmitted on a physical sidelink control channel (PSCCH). SCI-

1 may include information for resource allocation of a sidelink resource and for decoding of the second stage of sidelink control information (i.e., SCI-2). For example, SCI-1 may include a physical sidelink shared channel (PSSCH) resource assignment and a resource reservation period (if enabled). SCI-1 may further identify a priority level (e.g., Quality of Service (QoS)) of a PSSCH. For example, ultra-reliable-low-latency communication (URLLC) traffic may have a higher priority than text message traffic (e.g., short message service (SMS) traffic). Additionally, SCI-1 may include a PSSCH demodulation reference signal (DMRS) pattern (if more than one pattern is configured). The DMRS may be used by a receiver for radio channel estimation for demodulation of the associated physical channel. As indicated, SCI-1 may also include information about the SCI-2, for example, SCI-1 may disclose the format of the SCI-2. Here, the format indicates the resource size of SCI-2 (e.g., a number of REs that are allotted for SCI-2), a number of a PSSCH DMRS port(s), and a modulation and coding scheme (MCS) index. In some examples, SCI-1 may use two bits to indicate the SCI-2 format. Thus, in this example, four different SCI-2 formats may be supported. SCI-1 may include other information that is useful for establishing and decoding a PSSCH resource.

[0095] SCI-2 may also be transmitted on the PSCCH and may contain information for decoding the PSSCH. According to some aspects, SCI-2 includes a 16-bit layer 1 (LI) destination identifier (ID), an 8-bit LI source ID, a hybrid automatic repeat request (HARQ) process ID, a new data indicator (NDI), and a redundancy version (RV). For unicast communications, SCI-2 may further include a CSI report trigger. For groupcast communications, SCI-2 may further include a zone identifier and a maximum communication range for NACK. SCI-2 may include other information that is useful for establishing and decoding a PSSCH resource.

[0096] In some examples, the SCI (e.g., SCI-1 and/or SCI-2) may further include a resource assignment of retransmission resources reserved for one or more retransmissions of the sidelink transmission (e.g., the sidelink traffic/data). Thus, the SCI may include a respective PSSCH resource reservation and assignment for one or more retransmissions of the PSSCH. For example, the SCI may include a reservation message indicating the PSSCH resource reservation for the initial sidelink transmission (initial PSSCH) and one or more additional PSSCH resource reservations for one or more retransmissions of the PSSCH.

[0097] FIGs. 4A and 4B are diagrams illustrating examples of sidelink slot structures according to some aspects. The sidelink slot structures may be utilized, for example, in a V2X or other D2D network implementing sidelink. In the examples shown in FIGs. 4A and 4B, time is in the horizontal direction with units of symbols 402 (e.g., OFDM symbols); and frequency is in the vertical direction. Here, a carrier bandwidth 404 allocated for sidelink wireless communication is illustrated along the frequency axis. The carrier bandwidth 404 may include a plurality of sub-channels, where each sub-channel may include a configurable number of PRBs (e.g., 10, 15, 20, 25, 50, 75, or 100 PRBs).

[0098] Each of FIGs. 4A and 4B illustrate an example of a respective slot 400a or 400b including fourteen symbols 402 that may be used for sidelink communication. However, it should be understood that sidelink communication can be configured to occupy fewer than fourteen symbols in a slot 400a or 400b, and the disclosure is not limited to any particular number of symbols 402. Each sidelink slot 400a and 400b includes a physical sidelink control channel (PSCCH) 406 occupying a control region 418 of the slot 400a and 400b and a physical sidelink shared channel (PSSCH) 408 occupying a data region 420 of the slot 400a and 400b. The PSCCH 406 and PSSCH 408 are each transmitted on one or more symbols 402 of the slot 400a. The PSCCH 406 includes, for example, SCI-1 that schedules transmission of data traffic on time-frequency resources of the corresponding PSSCH 408. As shown in FIGs. 4A and 4B, the PSCCH 406 and corresponding PSSCH 408 are transmitted in the same slot 400a and 400b. In other examples, the PSCCH 406 may schedule a PSSCH in a subsequent slot.

[0099] In some examples, the PSCCH 406 duration is configured to be two or three symbols. In addition, the PSCCH 406 may be configured to span a configurable number of PRBs, limited to a single sub-channel. The PSSCH resource size may be fixed for a resource pool (e.g., 10% to 100% of one sub-channel in the first two or three symbols). For example, the PSCCH 406 may occupy 10, 12, 15, 20, or 25 RBs of a single sub channel. A DMRS may further be present in every PSCCH symbol. In some examples, the DMRS may be placed on every fourth RE of the PSCCH 406. A frequency domain orthogonal cover code (FD-OCC) may further be applied to the PSCCH DMRS to reduce the impact of colliding PSCCH transmissions on the sidelink channel. For example, a transmitting UE may randomly select the FD-OCC from a set of pre-defined FD-OCCs. In each of the examples shown in FIGs. 4A and 4B, the starting symbol for the PSCCH 406 is the second symbol of the corresponding slot 400a or 400b and the PSCCH 406 spans three symbols 402.

[0100] The PSSCH 408 may be time-division multiplexed (TDMed) with the PSCCH 406 and/or frequency-division multiplexed (FDMed) with the PSCCH 406. In the example shown in FIG. 4A, the PSSCH 408 includes a first portion 408a that is TDMed with the PSCCH 406 and a second portion 408b that is FDMed with the PSCCH 406. In the example shown in FIG. 4B, the PSSCH 408 is TDMed with the PSCCH 406.

[0101] One and two layer transmissions of the PSSCH 408 may be supported with various modulation orders (e.g., QPSK, 16-QAM, 64-QAM and 246-QAM). In addition, the PSSCH 408 may include DMRSs 414 configured in a two, three, or four symbol DMRS pattern. For example, slot 400a shown in FIG. 4A illustrates a two symbol DMRS pattern, while slot 400b shown in FIG. 4B illustrates a three symbol DMRS pattern. In some examples, the transmitting UE can select the DMRS pattern and indicate the selected DMRS pattern in SCI-1, according to channel conditions. The DMRS pattern may be selected, for example, based on the number of PSSCH 408 symbols in the slot 400a or 400b. In addition, a gap symbol 416 is present after the PSSCH 408 in each slot 400a and 400b.

[0102] Each slot 400a and 400b further includes SCI-2 412 mapped to contiguous RBs in the PSSCH 408 starting from the first symbol containing a PSSCH DMRS. In the example shown in FIG. 4A, the first symbol containing a PSSCH DMRS is the fifth symbol occurring immediately after the last symbol carrying the PSCCH 406. Therefore, the SCI-2 412 is mapped to RBs within the fifth symbol. In the example shown in FIG. 4B, the first symbol containing a PSSCH DMRS is the second symbol, which also includes the PSCCH 406. In addition, the SCI-2/PSSCH DMRS 412 are shown spanning symbols two through five. As a result, the SCI-2 PSSCH DMRS 412 may be FDMed with the PSCCH 406 in symbols two through four and TDMed with the PSCCH 406 in symbol five.

[0103] The SCI-2 may be scrambled separately from the sidelink shared channel. In addition, the SCI-2 may utilize QPSK. When the PSSCH transmission spans two layers, the SCI-2 modulation symbols may be copied on (e.g., repeated on) both layers. The SCI- 1 in the PSCCH 406 may be blind decoded at the receiving wireless communication device. However, since the format, starting location, and number of REs of the SCI-2412 may be derived from the SCI-1, blind decoding of SCI-2 is not needed at the receiver (receiving UE).

[0104] In each of FIGs. 4A and 4B, the second symbol of each slot 400a and 400b is copied onto (repeated on) a first symbol 410 thereof for automatic gain control (AGC) settling. For example, in FIG. 4A, the second symbol containing the PSCCH 406 FDMed with the PSSCH 408b may be transmitted on both the first symbol and the second symbol. In the example shown in FIG. 4B, the second symbol containing the PSCCH 406 FDMed with the SCI-2/PSSCH DMRS 412 may be transmitted on both the first symbol and the second symbol.

[0105] FIG. 5 is a diagram illustrating an example of a sidelink slot structure with feedback resources according to some aspects. The sidelink slot structure may be utilized, for example, in a V2X or other D2D network implementing sidelink. In the example shown in FIG. 5, time is in the horizontal direction with units of symbols 502 (e.g., OFDM symbols); and frequency is in the vertical direction. Here, a carrier bandwidth 504 allocated for sidelink wireless communication is illustrated along the frequency axis. A slot 500 having the slot structure shown in FIG. 5 includes fourteen symbols 502 that may be used for sidelink communication. However, it should be understood that sidelink communication can be configured to occupy fewer than fourteen symbols in a slot 500, and the disclosure is not limited to any particular number of symbols 502.

[0106] As in the examples shown in FIGs. 4A and 4B, the sidelink slot 500 includes a PSCCH 506 occupying a control region of the slot 500 and a PSSCH 508 occupying a data region of the slot 500. The PSCCH 506 and PSSCH 508 are each transmitted on one or more symbols 502 of the slot 500. The PSCCH 506 includes, for example, SCI-1 that schedules transmission of data traffic on time-frequency resources of the corresponding PSSCH 508. As shown in FIG. 5, the starting symbol for the PSCCH 506 is the second symbol of the slot 500 and the PSCCH 506 spans three symbols 502. The PSSCH 508 may be time-division multiplexed (TDMed) with the PSCCH 506 and/or frequency- division multiplexed (FDMed) with the PSCCH 506. In the example shown in FIG. 5, the PSSCH 508 includes a first portion 508a that is TDMed with the PSCCH 506 and a second portion 508b that is FDMed with the PSCCH 506.

[0107] The PSSCH 508 may further include a DMRSs 514 configured in a two, three, or four symbol DMRS pattern. For example, slot 500 shown in FIG. 5 illustrates a two symbol DMRS pattern. In some examples, the transmitting UE can select the DMRS pattern and indicate the selected DMRS pattern in SCI-1, according to channel conditions. The DMRS pattern may be selected, for example, based on the number of PSSCH 508 symbols in the slot 500. In addition, a gap symbol 516 is present after the PSSCH 508 in the slot 500.

[0108] The slot 500 further includes SCI-2512 mapped to contiguous RBs in the PSSCH 508 starting from the first symbol containing a PSSCH DMRS. In the example shown in FIG. 5, the first symbol containing a PSSCH DMRS is the fifth symbol occurring immediately after the last symbol carrying the PSCCH 506. Therefore, the SCI-2 512 is mapped to RBs within the fifth symbol.

[0109] In addition, as shown in FIG. 5, the second symbol of the slot 500 is copied onto (repeated on) a first symbol 510 thereof for automatic gain control (AGC) settling. For example, in FIG. 5, the second symbol containing the PSCCH 506 FDMed with the PSSCH 508b may be transmitted on both the first symbol and the second symbol.

[0110] HARQ feedback may further be transmitted on a physical sidelink feedback channel (PSFCH) 518 in a configurable resource period of 0, 1, 2, or 4 slots. In sidelink slots (e.g., slot 500) containing the PSFCH 518, one symbol 502 may be allocated to the PSFCH 518, and the PSFCH 518 may be copied onto (repeated on) a previous symbol for AGC settling. In the example shown in FIG. 5, the PSFCH 518 is transmitted on the thirteenth symbol and copied onto the twelfth symbol in the slot 500. A gap symbol 516 may further be placed after the PSFCH symbols 518.

[0111] In some examples, there is a mapping between the PSSCH 508 and the corresponding PSFCH resource. The mapping may be based on, for example, the starting sub-channel of the PSSCH 508, the slot containing the PSSCH 508, the source ID and the destination ID. In addition, the PSFCH can be enabled for unicast and groupcast communication. For unicast, the PSFCH may include one ACK/NACK bit. For groupcast, there may be two feedback modes for the PSFCH. In a first groupcast PSFCH mode, the receiving UE transmits only NACK, whereas in a second groupcast PSFCH mode, the receiving UE may transmit either ACK or NACK. The number of available PSFCH resources may be equal to or greater than the number of UEs in the second groupcast PSFCH mode.

[0112] FIG. 6 illustrates an example of a wireless communication network 600 configured to support industrial internet of things (IIoT). The IIoT network 600 may include a base station (e.g., gNB) 602 and a plurality of IIoT devices, such as a programmable logic controller (PLC) 604 and other IIoT devices 606a and 606b. In the example shown in FIG. 6, the other IIoT devices 606a and 606b may include sensors/actuators (SAs). In some examples, the PLC 604 may be configured to control between approximately twenty to fifty SAs (two of which 606a and 606b are illustrated, for simplicity). The base station 602 and IIoT devices 604, 606a, and 606b may communicate, for example, via respective cellular (Uu) links 608a, 608b, and 608c.

[0113] Traffic between the PLC 604 and SAs 606a and 606b may have a tight latency (e.g., 1~2 ms) and an ultra-reliability requirement of a 10 ⁶ error rate. Communication between the PLC 604 and SAs 606a and 606b through the base station 602 (e.g., via Uu links 608a-608c) results in multiple over the air (OTA) transmissions, thus affecting latency and reliability. Therefore, the PLC 604 and SAs 606a and 606b can further be configured for sidelink communication via sidelinks 610a and 610b to enable direct communication between the PLC 604 and each of the SAs 606a and 606b. In some examples, the sidelink communication may be scheduled by the base station 602 (e.g., in a Mode 1 sidelink configuration). For example, the base station 602 may schedule sidelink communication between the PLC 604 and one or more of the SAs 606a and 606b via DCI 3_0.

[0114] In some examples, the base station 602 may receive a scheduling request from the

PLC 604 or one of the SAs 606a or 606b requesting the base station 602 schedule high priority traffic (e.g., URLLC traffic) to be transmitted via a sidelink 610a or 610b or a Uu link 608a-608c. However, the base station 602 may have previously scheduled a lower priority PSSCH (or PSSCH retransmission) on one of the sidelinks 610a or 610b that may prevent the higher priority transmission (e.g., uplink or sidelink transmission) from meeting the URLLC requirements.

[0115] Therefore, various aspects of the disclosure facilitate modification of a lower priority sidelink transmission to enable scheduling of a higher priority sidelink or uplink transmission on resources (e.g., time-frequency resources) that overlap with the lower priority sidelink transmission. The lower priority sidelink transmission may be modified, for example, by cancelling the sidelink transmission within at least the overlapping resources or reducing the transmission power of the sidelink transmission within at least the overlapping resources. This may result in improved scheduling flexibility and interference coordination within the wireless communication network.

[0116] In some examples, a base station (e.g., base station 310 or 602) may schedule resources for a sidelink transmission (e.g., an initial sidelink transmission or a sidelink retransmission) from a transmitting wireless communication device (e.g., a transmitting UE, such as a V2X or D2D device shown in FIG. 3 or an IIoT device shown in FIG. 6) to a receiving UE. The base station may then transmit a cancellation indication to at least the transmitting UE indicating an overlap between at least a portion of the resources scheduled for the sidelink transmission and an additional transmission (e.g., an uplink or sidelink transmission). The transmitting UE may then modify the sidelink transmission based on the cancellation indication.

[0117] In some examples, the control information carrying the cancellation indication may further include resource information identifying at least the portion of the resources that overlap the additional transmission. For example, the resource information may include a plurality of bits, each corresponding to a resource block group and a symbol. In some examples, each bit may map to an uplink symbol or a flexible symbol. In other examples, each bit may only map to an uplink symbol. The resource region (e.g., time and frequency resource region) associated with the resource information may be configured, for example, via radio resource control (RRC) signaling.

[0118] In some examples, the control information may include a DCI 2_4 format or a new DCI format. The DCI 2_4 format is used to notify a UE (or group of UEs) of the resource block groups and symbols on which the UE should cancel a corresponding uplink transmission. Thus, the DCI 2_4 format provides an uplink cancellation indication (ULCI). Aspects disclosed herein may utilize the DCI 2_4 format to further provide a sidelink cancellation indication (SLCI). Thus, in examples in which the control information includes a DCI 2_4 format, the same set of bits in the resource information may be used to cancel the scheduled resources of a sidelink transmission and/or an uplink transmission that overlaps with the additional (higher priority) transmission. For example, a UE decoding a DCI 2_4 may cancel the scheduled resources of an uplink transmission (e.g., a physical uplink shared channel (PUSCH) or sounding reference signal (SRS)) and/or a sidelink transmission (e.g., a physical sidelink control channel (PSCCH)/physical sidelink shared channel (PSSCH)) indicated by the cancellation indication.

[0119] In examples in which the control information includes a new DCI format (or an enhanced DCI 2_4 format), the network entity may transmit a cancellation application indicator indicating whether the cancellation indication is applicable to one or more of uplink transmissions or sidelink transmissions. In some examples, the cancellation application indicator may be included within the control information carrying the cancellation indication. For example, the cancellation application indicator may be a dedicated field in the control information that indicates whether the cancellation indication is applicable to only uplink transmissions, only sidelink transmissions, or both uplink and sidelink transmissions. In some examples, the cancellation application indicator may be configured via radio resource control (RRC) signaling. In some examples, the cancellation application indicator may include a cancellation indication radio network temporary identifier (CI-RNTI) utilized to scramble a cyclic redundancy check (CRC) of the control information. In some examples, the cancellation application indicator may include a search space configuration associated with the control information. For example, the search space configuration may include respective search spaces or monitoring occasions within one or more search spaces that are each associated with one or more of an uplink cancellation indication (e.g., for cancelling or modifying an uplink transmission) or a sidelink cancellation indication (e.g., for cancelling or modifying a sidelink transmission). As another example, the search space configuration may associate search spaces or monitoring occasions utilized to schedule uplink transmissions or sidelink transmissions with search spaces or monitoring occasions utilized for uplink cancellation indications or sidelink cancellation indications, respectively.

[0120] In some examples, a dedicated DCI format may be configured for each type of cancellation. For example, DCI 2_4 format may be utilized for uplink cancellation, whereas other DCI formats may be utilized for sidelink cancellation and for both uplink and sidelink cancellation.

[0121] In some examples, the control information carrying the cancellation indication

(e.g., the new DCI format or enhanced DCI 2_4 format) may further include cancellation behavior information associated with the cancellation indication. The transmitting UE may utilize the cancellation behavior information to modify the sidelink transmission. For example, the cancellation behavior information may include the resource information indicating at least the portion of the resources that overlaps with the additional transmission. As another example, the cancellation behavior information may include a priority indicator or cast type of the additional transmission, and the transmitting UE may modify the sidelink transmission based on the priority indicator and/or cast type. In an example, the scheduling information for the sidelink transmission may further include a priority indicator associated with the sidelink transmission. In this example, the transmitting UE may modify the sidelink transmission based on the respective priority indicators of the additional transmission and the sidelink transmission. For example, if the priority indicator of the sidelink transmission indicates a lower priority than the priority indicator of the additional transmission, the transmitting UE may cancel at least the portion of the resources for the sidelink transmission. As another example, the priority indicator may be a multi-bit priority indicator. In this example, the transmitting UE may compare the multi-bit priority indicator with a threshold and modify the sidelink transmission in response to the multi-bit priority indicator indicating a lower priority than the priority indicator of the additional transmission and the multi-bit priority indicator being below the threshold.

[0122] In some examples, the cancellation behavior information may include a cancellation type of the cancellation indication. For example, the cancellation type may include a hard cancellation type or a soft cancellation type. In examples in which the cancellation type is the hard cancellation type, the transmitting UE may cancel at least the portion of the resources for the sidelink transmission. In examples in which the cancellation type is the soft cancellation type, the cancellation behavior information may further include a power control parameter associated with the soft cancellation type. The transmitting UE may then reduce a transmission power of the sidelink transmission within at least the portion of the resources based on the power control parameter. In other examples, when the cancellation type is the soft cancellation type, the transmitting UE may use the portion of the resources for active interference cancellation (AIC) to reduce emissions to other frequencies and/or tone reservation (TR) to improve the peak-to- average -power ratio (PAPR) of the sidelink transmission.

[0123] In some examples, the control information carrying the cancellation indication may further include preemption scheduling information scheduling the transmission of a preemption indication from the transmitting UE to the receiving UE. In other examples, the transmitting UE may select resources for the transmission of the preemption indication to the receiving UE without receiving a grant from the network entity. In some examples, the preemption indication may be transmitted within a retransmission resource for the sidelink transmission. For example, the scheduling information scheduling the sidelink transmission may further schedule one or more retransmissions of the sidelink transmission. The transmitting UE may include the preemption indication in the next retransmission of the sidelink transmission following the transmission of the modified sidelink transmission. In other examples, the preemption indication may be transmitted within first stage sidelink control information, second stage sidelink control information, a sidelink medium access control (MAC) control element (MAC-CE), or a sidelink radio resource control (RRC) message. The preemption indication may indicate, for example, preemption information associated with the cancellation behavior information. In some examples, the preemption information may include resource information identifying at least the portion of the resources, a symbol index offset for a demodulation reference signal, a puncturing pattern of the sidelink transmission, and/or a rate matching pattern of the sidelink transmission. The receiving UE may process the sidelink transmission (e.g., (re)-attempt to decode the sidelink transmission) based on the preemption indication.

[0124] Other aspects of the disclosure provide an enhancement in scheduling of sidelink transmissions to include a priority indicator associated with the sidelink transmission. For example, the base station may include a single bit or multi-bit priority indicator within DCI (e.g., DCI 3_0 format) scheduling a sidelink transmission. The priority indicator may facilitate prioritization between multiple transmissions (e.g., sidelink and/or uplink transmissions) scheduled for a transmitting UE. For example, the transmitting UE may receive respective scheduling information (e.g., respective DCI 3_0) for each of a sidelink transmission and an additional transmission (e.g., uplink or sidelink). The scheduling information may indicate that the two transmissions are scheduled on overlapping resources. The transmitting UE may utilize the respective priority indicators included in each of the scheduling information to prioritize between the transmissions within the overlapping resources. The priority indicator may further facilitate HARQ codebook construction based on priority. The priority indicator may further be associated with a power control parameter indicating a transmission power of the sidelink transmission based on the priority indicator. In some examples, the priority indicator may be included in a scheduling request for the sidelink transmission sent to the base station.

[0125] Other aspects of the disclosure facilitate resumption of the sidelink transmission within resources outside of the overlapping resources. For example, resumption may occur within non-overlapping time resources (e.g., symbols) and/or non-overlapping frequency resources. An additional reference signal may be included within at least a resumed portion of the sidelink transmission for phase continuity and/or an additional AGC symbol may be included within the resumed sidelink transmission for AGC calibration.

[0126] FIG. 7 is a signaling diagram illustrating exemplary signaling 700 for sidelink cancellation between a base station (e.g., gNB) 702, a transmitting (Tx) UE 704, and a receiving (Rx) UE 706 according to some aspects. The base station 702 may correspond to any of the base stations or other scheduling entities illustrated in any of FIGs. 1, 3, and/or 6. In addition, the Tx UE 704 and Rx UE 706 may correspond to any of the UEs, sidelink devices, V2X devices, D2D devices, IIoT devices, or other scheduled entities illustrated in any of FIGs. 1, 3, and/or 6.

[0127] At 708, the base station 702 may transmit scheduling information scheduling a sidelink transmission to the Tx UE 704. In some examples, the base station 702 may transmit the scheduling information to both the Tx UE 704 and the Rx UE 706. The scheduling information may be transmitted within, for example, DCI, such as DCI 3_0. The scheduling information may include resources (e.g., time-frequency resources) allocated to the sidelink transmission. For example, the resources allocated to the sidelink transmission may include one or more sub-channels and one or more slots. In some examples, the scheduling information may further include a priority indicator indicating a priority of the sidelink transmission. In addition, the scheduling information may further include a power control parameter associated with the priority indicator and indicating a transmission power of the sidelink transmission based on the priority.

[0128] At 710, the base station 702 may transmit a cancellation indication to the Tx UE 704. The cancellation indication may be transmitted within control information, such as DCI. For example, the DCI may include a DCI 2_4 format or a new or enhanced DCI format. In some examples, the base station 702 may select between multiple DCI formats. For example, a first format may be the DCI 2_4 format, which may be utilized for cancellation of uplink transmissions, a second format may be another DCI format, which may be utilized for cancellation of sidelink transmissions, and a third format may be a different DCI format, which may be utilized for cancellation of both uplink and sidelink transmissions. In some examples, the base station 702 may transmit the same DCI carrying the cancellation indication (e.g., a sidelink cancellation indication (SLCI)) to both the Tx UE 704 and the Rx UE 706. In some examples, the base station 702 may transmit separate DCI, each carrying the SLCI, to the Tx UE 704 and the Rx UE 706.

[0129] In some examples, the DCI may be associated with a cancellation application indicator indicating whether the cancellation indication is applicable to only uplink transmissions, only sidelink transmissions, or both uplink and sidelink transmissions. For example, the DCI may include a dedicated field including the cancellation application indicator. In other examples, the cancellation application indicator may be configured via RRC signaling. In yet other examples, the cancellation application indicator may include a cancellation indication radio network temporary identifier (CI-RNTI) utilized to scramble a cyclic redundancy check (CRC) of the control information. In still other examples, the cancellation application indicator may include a search space configuration of the DCI. For example, the search space configuration may configure respective search spaces and/or respective monitoring occasions within a search space for cancellation of uplink transmissions, sidelink transmissions, and/or both uplink and sidelink transmissions. Thus, each search space or monitoring occasion may be associated with cancellation of a specific type of transmission (e.g., uplink, sidelink, or both uplink and sidelink). In some examples, the search space configuration may associate search spaces or monitoring occasions utilized to schedule uplink transmissions or sidelink transmissions with search spaces or monitoring occasions utilized for uplink cancellation indications or sidelink cancellation indications, respectively. For example, upon blind decoding a DCI 3_0 scheduling a sidelink transmission within a particular search space or monitoring occasion, a receiving UE may be able to identify a search space or monitoring occasion to monitor for a DCI 2_4 or other new DCI format cancelling the sidelink transmission. The mapping between scheduling DCI and corresponding cancellation DCI may be configured, for example, via RRC signaling.

[0130] The cancellation indication (e.g., SLCI) may indicate, for example, at least an overlap between a portion of the resources allocated to the sidelink transmission and an additional transmission. For example, the cancellation indication may include resource information identifying at least the portion of the resources that overlap with the additional transmission (e.g., the overlapping resources). In some examples, the resource information may include a plurality of bits, each corresponding to a resource block group (RBG) and a symbol of a sidelink resource region (e.g., a sidelink resource pool). Each RBG may include, for example, two or more RBs of a sub-channel. The sidelink resource region (e.g., TimeFrequencyRegionSL parameter) for sidelink cancellation may be configured via RRC signaling or as a codepoint (e.g., bitmap) in the DCI. In some examples, the sidelink resource region may include both uplink symbols and flexible symbols of a semi-static time division duplex (TDD) pattern. In this example, the DCI may include the DCI 2_4 format, which may be used for both uplink cancellation and sidelink cancellation without any modification to the DCI 2_4 format. Thus, upon receiving the DCI 2_4, the Tx UE 704 may cancel any scheduled transmission (uplink and/or sidelink) within the overlapping resources. In other examples, the sidelink resource region may include only uplink symbols of the semi-static TDD pattern. This sidelink resource region configuration may be utilized in examples in which sidelink transmissions may only be transmitted on uplink symbols (and not flexible symbols). [0131] In some examples, the cancellation indication (e.g., SLCI) may include cancellation behavior information. The cancellation behavior information may include the resource information defining the overlapping resources, as described above. In examples in which the DCI include a new or enhanced DCI format, the cancellation behavior information may further indicate a cancellation behavior to be applied by the transmitting UE. The cancellation behavior applied by the Tx UE 704 may include, for example, modifying the sidelink transmission within at least the overlapping resources. Such modification may include cancellation of the sidelink transmission within at least the overlapping resources, reduction of the transmission power of the sidelink transmission within at least the overlapping resources or other suitable modification behavior. For example, the cancellation behavior information may include a cancellation type of the cancellation indication. The cancellation type may include a hard cancellation indicator or a soft cancellation indicator. The hard cancellation indicator may indicate that the Tx UE 704 should cancel the sidelink transmission within at least the overlapping resources. The soft cancellation indicator may indicate that Tx UE 704 should reduce the transmission power of the sidelink transmission within at least the overlapping resources or engage in other cancellation behavior to minimize interference and/or improve the signal properties of the sidelink transmission. For example, the soft cancellation indicator may indicate that the Tx UE 704 should utilize the overlapping resources for another purpose, such as active interference cancellation (AIC) to facilitate inter-client interference (ICI) cancellation or tone reservation (TR) to modulate the signal in the overlapping resources in order to reduce the peak-to-average-power (PAPR) ratio of the sidelink transmission.

[0132] In some examples, the cancellation behavior information may indicate the cancellation behavior to be applied based on the priority of the sidelink transmission and/or a cast type (e.g., unicast, groupcast, or broadcast) of the sidelink transmission. In an example, the cancellation behavior information may indicate that the Tx UE 704 should apply either hard cancellation behavior or soft cancellation behavior based on the priority of the sidelink transmission or the cast type of the sidelink transmission. As another example, the cancellation behavior information may indicate the cancellation behavior to be applied based on the respective priorities and/or respective cast types of the sidelink transmission and the additional transmission. For example, the cancellation behavior information may include a priority indicator indicating the priority of the additional transmission and/or a cast type indicator indicating the cast type of the additional transmission. In an example, the Tx UE 704 may apply a hard cancellation to the sidelink transmission in response to the priority of the sidelink transmission being lower than the priority of the additional transmission. The Tx UE 704 may further apply a soft cancellation to the sidelink transmission in response to the priority of the sidelink transmission being higher than the priority of the additional transmission.

[0133] In some examples, the cancellation indication may only be applicable to sidelink transmissions associated with a particular priority (e.g., a low priority PSSCH). In other examples, the cancellation indication may be applicable to the sidelink transmission regardless of the priority of the sidelink transmission. In this example, the base station 702 may transmit an RRC message to the Tx UE 704 indicating to cancel both high priority and low priority PSSCHs in response to receiving a cancellation indication.

[0134] The control information carrying the cancellation indication (e.g., SLCI) may further include preemption scheduling information scheduling a preemption indication to be sent from the Tx UE 704 to the Rx UE 706. The Tx UE 704 may transmit the preemption indication (PI) to the Rx UE 706 to indicate preemption information associated with the cancellation indication (e.g., cancellation behavior information, such as resource information, cancellation type, etc.). The Rx UE 706 may process (e.g., re(attempt) decoding of the sidelink transmission) based on the preemption indication.

[0135] At 712, the Tx UE 704 may optionally modify the sidelink transmission based on the cancellation indication. In some examples, the Tx UE 704 may modify the sidelink transmission based on the priority of the sidelink transmission. The priority of the sidelink transmission may be indicated, for example, in the DCI scheduling the sidelink transmission. For example, the Tx UE 704 may modify the sidelink transmission based on the sidelink transmission being a low priority sidelink transmission. In this example, the Tx UE 704 may not modify the sidelink transmission and may transmit the sidelink transmission based on the original scheduling information (e.g., scheduled resources, etc.) included in the scheduling DCI. As another example, the Tx UE 704 may modify the sidelink transmission based on the sidelink transmission being a low priority or a high priority sidelink transmission, as indicated via RRC signaling. As yet another example, the Tx UE 704 may modify the sidelink transmission based on a comparison between the priority and a threshold. For example, the priority indicator may indicate a priority level between 0 and 3, where 0 indicates a high priority and 3 indicates a low priority. In an example, the threshold may correspond to a priority level of 2. The Tx UE 704 may then modify the sidelink transmission in response to the priority level being greater than (or greater than or equal to) the threshold. In some examples, the threshold may be configured via RRC signaling.

[0136] In some examples, modification of the sidelink transmission may include cancelling the entire sidelink transmission (e.g., not transmitting the sidelink transmission). For example, the Tx UE 704 may cancel the sidelink transmission in all scheduled resources based on an amount of overlapping or non-overlapping resources. In an example, the Tx UE 704 may cancel the sidelink transmission in a l scheduled resources in response to a non-overlapping resource percentage (e.g., the percentage of non-overlapping resources of the scheduled resources) being less than a threshold.

[0137] In other examples, modification of the sidelink transmission includes generating a modified sidelink transmission and transmitting the modified sidelink transmission to the Rx UE 706. For example, the Tx UE 704 may cancel the sidelink transmission within at least the overlapping resources and transmit the sidelink transmission within remaining resources of the scheduled resources. In this example, the Tx UE 704 may generate a new waveform for transmission of the sidelink transmission within the remaining resources, shift a DM-RS within the sidelink transmission (e.g., shift the DM-RS by an offset), delay the sidelink transmission (e.g., shift all symbols by an offset), puncture the sidelink transmission using a puncturing pattern (e.g., puncture the sidelink transmission in the cancelled resources), perform rate-matching of the sidelink transmission using a new rate matching pattern based on the remaining resources, and/or boost the transmission power of the sidelink transmission in the remaining resources. Here, the remaining resources may include the scheduled resources other than (outside of) the cancelled resources. As another example, the Tx UE 704 may reduce the transmission power of the sidelink transmission within at least the overlapping resources or utilize the overlapping resources for a different purpose (e.g., AIC or TR).

[0138] At 714, the Tx UE 704 may optionally transmit a preemption indication (PI) to the Rx UE 706. In examples in which the Rx UE 706 is in-coverage and the cancellation indication is sent to the Rx UE as well as the Tx UE, the Tx UE 704 may not transmit the PI to the Rx UE. However, if the Rx UE 706 is out-of-coverage or if the cancelled resources differ from those indicated in the cancellation indication or the Tx UE 704 performs other modifications to the sidelink transmission, the Tx UE 704 may transmit the PI to the Rx UE 706. The PI may inform the Rx UE 706 about the cancellation behavior of the modified sidelink transmission to facilitate decoding (or re-attempted decoding) of the modified sidelink transmission by the Rx UE 706. For example, the PI may include resource information identifying the cancelled or modified resources, a symbol index offset for a DMRS included within the sidelink transmission (e.g., based on the cancelled resources), a delayed transmission indication indicating that all symbols of the sidelink transmission are shifted by a symbol index offset, a puncturing pattern of the sidelink transmission, a rate matching pattern of the sidelink transmission, and/or a power parameter indicating a transmission power of at least one of the remaining resources or the overlapping resources.

[0139] In some examples, the control information carrying the cancellation indication may include the preemption scheduling information scheduling the PI, as indicated above. In other examples, the Tx UE 704 may select resources for the transmission of the PI without receiving a grant from the network entity. For example, the SLCI transmission may have a high priority, and based on the high priority, the Tx UE 704 may randomly select resources (e.g., from the sidelink resource pool) without a grant. In some examples, the PI may be transmitted within a retransmission resource for the sidelink transmission. For example, the scheduling information scheduling the sidelink transmission may further schedule one or more retransmissions of the sidelink transmission. The transmitting UE may include the PI in the next retransmission of the sidelink transmission following the transmission of the modified sidelink transmission at 712. In some examples, the PI may be transmitted within SCI-1, SCI-2, a sidelink medium access control (MAC) control element (MAC-CE), or a sidelink radio resource control (RRC) message.

[0140] FIG. 8 is a diagram illustrating an example of sidelink cancellation according to some aspects. In the example shown in FIG. 8, a base station 802 is shown in wireless communication with a high priority UE (HP-UE) 804 and a low priority UE (LP-UE) 806 via respective Uu links. The LP-UE 806 may further be in wireless communication with an Rx-UE 808 via a sidelink. The Rx-UE 808 may be within the coverage area of the base station 802 or outside of the coverage area of the base station 802. The base station (e.g., gNB) 802 may be any of the base stations or other scheduling entities illustrated in any of FIGs. 1, 3, 6, or 7. In addition, each of the UEs 804, 806, and 808 may be any of the UEs, V2X devices, D2D devices, sidelink device, IIoT devices, or other scheduled entities illustrated in any of FIGs. 1, 3, 6, or 7.

[0141] The diagram of FIG. 8 illustrates exemplary communication that may occur over time (t) between the base station 802 and each of the UEs 804, 806, and 808. For example, to schedule a sidelink transmission from the LP-UE 806 to the Rx-UE 808, the LP-UE 806 may generate and transmit a scheduling request (SR) 810 to the base station 802. The SR may be a low priority SR (LP SR) 810 for a low priority sidelink transmission. In some examples, the LP SR 810 may include a priority indicator indicating a priority (e.g., low priority) of the sidelink transmission. In other examples, the base station 802 may determine the priority of the sidelink transmission.

[0142] In response to receiving the LP SR 810, the base station may schedule the sidelink transmission and generate and transmit to the LP-UE 806 control information (e.g., DCI 3_0) 812 including scheduling information for the sidelink transmission. The scheduling information may include, for example, scheduled resources (e.g., time-frequency resources) for the sidelink transmission and other suitable information. For example, the resources allocated to the sidelink transmission may include one or more sub-channels and one or more slots. In some examples, the scheduling information may further include a priority indicator indicating a priority of the sidelink transmission and a power control parameter associated with the priority indicator and indicating a transmission power of the sidelink transmission based on the priority. In examples in which the Rx-UE 808 is within the coverage area of the base station, the base station 802 may further transmit the DCI 3_0812 to the Rx-UE 808.

[0143] After scheduling the sidelink transmission, the base station 802 may receive another scheduling request 814 from the HP-UE 804. The SR may be a high priority SR (HP SR) 814 for a high priority sidelink or uplink transmission (e.g., URLCC transmission). In some examples, the HP SR 814 may include a priority indicator indicating a priority (e.g., high priority) of the sidelink or uplink transmission. In other examples, the base station 802 may determine the priority of the sidelink or uplink transmission.

[0144] The base station 802 may then schedule the high priority transmission for the HP- UE 804 and generate and transmit DCI 816 containing scheduling information for the high priority transmission to the HP-UE 804. In some examples, the base station 802 may schedule the high priority transmission (e.g., a high priority uplink transmission) for the HP-UE 804 without first receiving the HP SR 814 from the HP-UE 804. In examples in which the base station 802 schedules the high priority transmission on resources that overlap (e.g., in time and frequency) with the resources scheduled for the low priority sidelink transmission, the base station 802 may generate and transmit a sidelink cancellation indication (SLCI) 818 to the LP-UE 806. The SLCI 818 may be transmitted to the LP-UE 806 within DCI, such as DCI 2_4 or a new or enhanced DCI. In some examples, the base station 802 may further transmit the same SLCI 818 to the Rx-UE 808 or may transmit respective SLCIs to each of the LP-UE 806 and Rx-UE 808.

[0145] The SLCI 818 may indicate, for example, an overlap between at least a portion of the resources scheduled for (allocated to) the low priority sidelink transmission and the high priority transmission. For example, the SLCI 818 may include resource information identifying at least the portion of the resources that overlap with the additional transmission (e.g., the overlapping resources). The SLCI 818 may further include cancellation behavior information, which may include, for example, the resource information, a cancellation type (e.g., hard or soft) of the SLCI 818, and/or other information that may indicate a cancellation behavior to be applied by the LP-UE 806 to the low priority sidelink transmission. For example, the cancellation behavior information may indicate the cancellation behavior to be applied based on the priority of the low priority sidelink transmission and/or high priority transmission and/or a cast type (e.g., unicast, groupcast, or broadcast) of the low priority sidelink transmission and/or high priority transmission. In some examples, the DCI carrying the SLCI 818 may further include preemption scheduling information scheduling a preemption indication to be sent from the LP-UE 806 to the Rx-UE 808.

[0146] Based on the SLCI 818, the LP-UE 806 may modify the low priority sidelink transmission. In the example shown in FIG. 8, the LP-UE 806 may transmit the low priority sidelink transmission (PSSCH) 820 within remaining resources (e.g., the scheduled resources for the sidelink transmission that were not cancelled by the SLCI 818) and cancel the low priority sidelink transmission 822 within the overlapping resources allocated to the high priority transmission. For example, the LP-UE 806 may generate a new waveform for the low priority sidelink transmission 820 for the remaining resources, apply a new rate matching pattern to the sidelink transmission 820 based on the remaining resources, and/or boost the transmission power of the sidelink transmission 820 in the remaining resources. The LP-UE 806 may further puncture the sidelink transmission 822 in the cancelled resources. In other examples, instead of cancelling the low priority sidelink transmission, the SLCI 818 may indicate that the LP-UE 806 should reduce the transmission power of the sidelink transmission 822 within at least the overlapping resources or utilize the overlapping resources of the sidelink transmission 822 for a different purpose (e.g., AIC or TR). The HP-UE 804 may further transmit the high priority transmission (e.g., PSSCH or PUSCH) 824 within the overlapping resources. [0147] To facilitate decoding of the low priority PSSCH at the Rx-UE 808, the LP-UE 806 may further transmit a preemption indication (PI) 826 to the Rx-UE 808. In the example shown in FIG. 8, the PI 826 may be transmitted within a next retransmission (PSSCH Re-Tx) 826 of the low priority sidelink transmission 820. In other examples, resources for the PI 826 may be included in the SLCI 818 or may be selected by the LP- UE 806. The PI 826 may be transmitted, for example, within SCI-1, SCI-2, a sidelink MAC-CE, or a sidelink RRC message.

[0148] FIG. 9 is a diagram illustrating an example of downlink control information (DCI) 900 carrying a cancellation indication 902 according to some aspects. The DCI 900 may include a DCI 2_4 format, an enhanced DCI 2_4 format, or a new format. The cancellation indication 902 includes resource information 904 identifying at least a portion of the resources allocated to a sidelink transmission that overlap with an additional transmission (e.g., an additional sidelink or uplink transmission). For example, the resource information 904 may include a plurality of bits, each corresponding to a resource block group (RBG) and symbol of a resource region (e.g., a sidelink resource pool).

[0149] In some examples, the cancellation indication 902 may be a sidelink cancellation indication (SLCI), an uplink cancellation indication (ULCI), or both an ULCI and SLCI. In some examples, dedicated DCI formats may be used for uplink cancellation (e.g., DCI 2_4), sidelink cancellation, and both uplink and sidelink cancellation. In other examples, the DCI 900 may be a DCI 2_4 and the cancellation indication 902 may be considered as both an ULCI and SLCI. In this example, the Tx UE may cancel any transmission (SL or UL) within the overlapping resources identified in the resource information 904. As another example, the DCI 900 may be an enhanced DCI (e.g., an enhanced DCI 2_4 or another/new DCI) that includes a cancellation application indicator 906, which may be a dedicated field of the cancellation indication 902. In other examples, instead of including a dedicated field, the cancellation application indicator may be transmitted within an RRC message that indicates to the UE whether the cancellation indication 902 received in the enhanced DCI is an SLCI, an ULCI, or both an SLCI and ULCI. In other examples, a CRC of the DCI 900 may be scrambled with one of a plurality of CI-RNTIs (e.g., a SLCI- RNTI, an ULCI-RNTI, or a SL/ULCI-RNTI) indicating whether the cancellation indication 902 is a SLCI, ULCI, or both SLCI and ULCI. In other examples, the DCI 900 may be transmitted within a specific search space or monitoring occasion that is associated with a particular cancellation type (e.g., sidelink, uplink, or both) based on a search space configuration of the PDCCH search space. [0150] In examples in which the DCI 900 is a new or enhanced DCI format, the cancellation indication 902 may further include cancellation behavior information 908. In some examples, the resource information 904 may form a part of the cancellation behavior information 908. The cancellation behavior information 908 may further optionally include additional cancellation behavior information indicating a cancellation behavior applied to the sidelink transmission by the transmitting UE. For example, the cancellation behavior information 908 may include a cancellation type of the cancellation indication. The cancellation type may include a hard cancellation indicator or a soft cancellation indicator. The hard cancellation indicator cancels the sidelink transmission within at least the overlapping resources. The soft cancellation indicator may further indicate whether the transmitting UE should reduce the transmission power of the sidelink transmission within at least the overlapping resources or engage in other cancellation behavior to minimize interference and/or improve the signal properties of the sidelink transmission.

[0151] In some examples, the cancellation behavior information 908 may further indicate the cancellation behavior to be applied based on the priority of the sidelink transmission and/or a cast type (e.g., unicast, groupcast, or broadcast) of the sidelink transmission. In some examples, the cancellation behavior information 908 may further include a priority indicator and/or cast type of the additional transmission, and may indicate the cancellation behavior to be applied by the transmitting UE based on the respective priority types and/or cast types of the sidelink transmission and the additional transmission.

[0152] The DCI 900 carrying the cancellation indication 902 may further include PI scheduling information 910 indicating resources scheduled for a PI transmission by the transmitting UE. The PI resources may correspond to SCI-1 resources, SCI-2 resources, sidelink MAC-CE resources, or sidelink RRC resources.

[0153] FIG. 10 is a diagram illustrating an example of a resource region configuration 1000 for indicating overlapping resources according to some aspects. The resource region configuration 1000 includes frequency resources 1002 divided into RB Groups 1004 and time resources 1006 divided into symbols 1008 of a slot. In the example shown in FIG. 10, two RB Groups (RB Group 1 and RB Group 2) are illustrated for simplicity. Each RB Group 1004 may include, for example, two or more RBs of a sub-channel. The symbols 1008 may be based on a semi-static TDD pattern of downlink, uplink, and flexible symbols in a cell. In some examples, the symbols 1008 may correspond to the uplink symbols and the flexible symbols in a slot (e.g., in examples in which the resource region configuration 1000 corresponds to an uplink and/or sidelink resource region). In other examples, the symbols 1008 may correspond to only the uplink symbols in a slot (e.g., in examples in which the resource region configuration 1000 corresponds to a sidelink resource region). Thus, the resource region configuration 1000 includes a plurality of resources 1010 (e.g., resources 0-12), each corresponding to an RB Group 1004 and a symbol 1008. The resource region configuration 1000 (e.g., TimeFrequencyRegionSL parameter) for sidelink cancellation may be configured via RRC signaling or as a codepoint (e.g., bitmap) in DCI.

[0154] The resource region configuration 1000 shown in FIG. 10 may be utilized to indicate overlapping resources between a low priority sidelink transmission and a higher priority additional transmission (e.g., uplink or sidelink transmission). For example, DCI 1012 carrying a cancellation indication may include resource information 1014 indicating the overlapping resources. The first symbol in the resource region configuration 1000 associated with the DCI 1012 may be T' _pr0 c,2 after the last symbol of the DCI 1012. In some examples, a UE may not expect to cancel a symbol 1008 starting earlier than T _pr0 c,2 after the last symbol of a PDCCH control resource set (CORESET) detecting the DCI 1012.

[0155] As shown in FIG. 10, the resource information 1014 may include a plurality of bits, each mapping to one of the resources 1010 in the resource region configuration 1000. Each bit may be set to zero or one based on whether the corresponding resource 1010 is an overlapping resource. For example, a bit set to zero indicates there is no overlap between a sidelink transmission scheduled on the resource 1010 and an additional transmission, whereas a bit set to one indicates there is an overlap between a sidelink transmission scheduled on the resource 1010 and the additional transmission. In the example shown in FIG. 10, resources 10 and 12 are overlapping resources, and thus the bits in the resource information 1014 corresponding to resources 10 and 12 are set to one.

[0156] The DCI 1012 may correspond, for example, to a DCI 2_4 format, an enhanced format (e.g., an enhanced DCI 2_4) or a new format. In examples in which the DCI 1012 includes the DCI 2_4 format, the resource region configuration 1000 includes both uplink and flexible symbols 1008, since uplink transmissions may be scheduled on uplink and/or flexible symbols. In this example, the bits in the resource information 1014 that map to flexible symbols 1008 may be set to zero, as sidelink transmissions may not be scheduled on flexible symbols of a slot. In examples in which the DCI 1012 includes an enhanced or new DCI, the resource region configuration 1000 may include only uplink symbols 1008. In this example, each bit in the resource information 1014 may be set to zero or one, depending on the scheduled overlapping resources. In addition, the number of bits included in the resource information 1014 may be reduced, since sidelink transmissions may be scheduled on only uplink symbols, and therefore, flexible symbols may not be included in the resource region configuration 1000. For example, instead of including fourteen bits in the resource information 1014, the resource information 1014 may include only five or ten bits, depending on the number of uplink symbols in the semi-static TDD pattern.

[0157] FIG. 11 is a diagram illustrating an example of a preemption indication (PI) 1100 according to some aspects. The PI 1100 may be transmitted within, for example, a retransmission resource of a sidelink transmission or within SCI-1, SCI-2, a sidelink MAC-CE, or sidelink RRC message. The PI 1100 informs an Rx UE about the cancellation behavior applied to a sidelink transmission by the Tx UE to enable the Rx UE to attempt decoding or re-attempt decoding of the sidelink transmission.

[0158] The PI 1100 may include resource information 1102 indicating modified resources of a plurality of scheduled resources of a sidelink transmission. The resource information 1102 may further indicate whether the modified resources are cancelled resources or reduced power resources. In examples in which the modified resources are reduced power resources, the resource information 1102 may further indicate the transmission power of the sidelink transmission on the reduced power resources. In some examples, the resource information 1102 includes a cancellation pattern (e.g., a bitmap) for the modified resources. In some examples, the cancellation pattern may be the same as the resource information included in the cancellation indication (e.g., resource information 904/1014 shown in FIGs. 9/10). In other examples, the cancellation pattern may be different than the resource information included in the cancellation indication. As an example, the cancellation pattern may differ from the cancellation indication based on a minimum frequency resource size that may be cancelled. For example, if the cancellation indication cancels only a portion of a sub-channel, the Tx UE may cancel the entire sub-channel. Thus, the cancellation pattern indicates the actual modified resources of the sidelink transmission.

[0159] The PI 1100 may further optionally include a DMRS symbol index offset 1104, a delayed transmission indication 1106, a puncturing pattern 1108, and/or a rate-matching pattern 1110 for the sidelink transmission. The DMRS symbol index offset 1104 may indicate an offset between an original DMRS symbol of the sidelink transmission (e.g., based on the original scheduled sidelink transmission) and an actual DMRS symbol of the sidelink transmission (e.g., after modification of the sidelink transmission based on the cancellation indication). The delayed transmission indication 1106 may indicate that all symbols of the sidelink transmission are shifted by a certain offset (e.g., in symbols). Thus, the delayed transmission indication 1106 may indicate the first symbol of the modified sidelink transmission. The puncturing pattern 1108 may indicate a particular puncturing pattern applied to the sidelink transmission based on the cancellation indication. Similarly, the rate-matching pattern 1110 may indicate a particular rate matching applied to the modified sidelink transmission based on the resources utilized for the sidelink transmission (e.g., the remaining resources of the scheduled resources that were not cancelled by the cancellation indication).

[0160] FIG. 12 is a diagram illustrating an example of DCI 1200 carrying scheduling information 1202 for a sidelink transmission according to some aspects. The DCI may be, for example, an enhanced DCI 3_0 format or a new DCI format that provides an enhancement in scheduling of sidelink transmissions by indicating a priority of the sidelink transmission in the sidelink scheduling information 1202. The sidelink scheduling information 1202 can include sidelink resources (e.g., time-frequency resources) 1204 scheduled by a network entity (e.g., a base station, such as a gNB) for a transmitting wireless communication device (e.g., a UE) to transmit the sidelink transmission (e.g., PSCCH/PSSCH) to a receiving wireless communication device. The sidelink resources 1204 may be within a sidelink resource pool. In addition, the sidelink resources may include one or more sub-channels in the frequency domain and one or more slots in the time domain.

[0161] The scheduling information 1202 may further include a priority indicator 1206 indicating a priority of the sidelink transmission. In some examples, the priority indicator 1206 may be based on a priority indicator the network entity received from the transmitting wireless communication device. For example, the transmitting wireless communication device may include a priority indicator indicating a requested priority for the sidelink transmission in a scheduling request sent to the network entity. In other examples, the priority indicator may be associated with a traffic type of the sidelink transmission (e.g., PSSCH) or UE category (e.g., high-end UE, low-end UE, or reduced capability UE) of the transmitting wireless communication device. The priority indicator 1206 may provide for selective modification/cancellation of the sidelink transmission in response to receiving a cancellation indication (e.g., SLCI) for the sidelink transmission. For example, the transmitting wireless communication device may modify/cancel the sidelink transmission within at least the overlapping resources indicated by the SLCI in response to the priority indicator 1206 indicating a low priority PSSCH or the priority indicator indicating a priority level greater than a threshold. In addition, the priority indicator 1206 may facilitate prioritization between multiple transmissions (e.g., sidelink and/or uplink transmissions) scheduled for the transmitting wireless communication device. The priority indicator 1206 may further facilitate HARQ codebook construction based on priority.

[0162] The priority indicator 1206 may be, for example, a single bit or a multi-bit priority indicator. In an example, a single bit priority indicator 1206 may be utilized to prioritize between enhanced mobile broadband (eMBB) PSSCHs and URLLC PSSCHs. For example, the single bit priority indicator 1206 may indicate a low priority when the scheduled PSSCH is an eMBB PSSCH and a high priority when the scheduled PSSCH is an URLLC PSSCH. A multi-bit priority indicator may allow for more than two priority levels. For example, the multi-bit priority indicator may indicate a priority level between 0 and 3. In addition, the multi-bit priority indicator may facilitate comparison with a threshold to selectively modify/cancel the sidelink transmission.

[0163] The scheduling information 1202 may further include a power control parameter 1208 associated with the priority indicator 1206. The power control parameter 1208 may include, for example, a set of P0 and P0-alpha included within a transmit power control (TPC) command field in the DCI 1200, which may collectively indicate to either reduce or boost a transmission power of the sidelink transmission. For example, the power control parameter 1208 may include a first power control parameter 1208 (e.g., a first set of P0 and P0-alpha) for a first priority indicator associated with eMBB traffic and a second power control parameter 1208 (e.g., a second set of P0 and P0-alpha) for a second priority indicator associated with URLLC traffic. The first power control parameter 1208 associated with eMBB traffic may indicate to reduce the transmission power of the sidelink transmission, whereas the second power control parameter 1208 may indicate to boost the transmission power of the sidelink transmission. The power control parameter 1208 indicates the originally scheduled transmission power of the sidelink transmission prior to receiving any cancellation indication (e.g., SLCI).

[0164] FIG. 13 is a signaling diagram illustrating exemplary signaling between a base station (e.g., gNB) 1302, a transmitting (Tx) UE 1304, and a receiving (Rx) UE 1306 for a sidelink transmission based on priority according to some aspects. The base station 1302 may correspond to any of the base stations or other scheduling entities illustrated in any of FIGs. 1, 3, and/or 6-8. In addition, the Tx UE 1304 and Rx UE 1306 may correspond to any of the UEs, sidelink devices, V2X devices, D2D devices, IIoT devices, or other scheduled entities illustrated in any of FIGs. 1, 3, and/or 6-8.

[0165] At 1308, the Tx UE 1304 may transmit a scheduling request to the base station 1302 to schedule a sidelink transmission (e.g., PSSCH) from the Tx UE 1304 to the Rx UE 1306. The scheduling request may include a priority indicator for the PSSCH. The priority indicator may indicate a requested priority (e.g., priority level) for the PSSCH. For example, the priority indicator may be a single bit priority indicator requesting either a low priority or high priority or a multi-bit priority indicator requesting one of three or more priority levels. The scheduling request may further include a packet delay budget, Quality of Service (QoS), and other suitable parameters for the sidelink transmission.

[0166] At 1310, the base station 1302 may generate and transmit scheduling DCI (e.g., DCI 1200 shown in FIG. 12) to the Tx UE 1304 scheduling the sidelink transmission based on the scheduling request and according to various traffic parameters. The scheduling DCI may include scheduling information for the PSSCH. For example, the scheduling information may include resources allocated to the PSSCH, a priority indicator indicating the priority assigned to the PSSCH, and a power control parameter (PCP) associated with the assigned priority indicator. The priority indicator included in the scheduling information may be the same as or different than the priority indicator requested by the Tx UE 1304 in the scheduling request.

[0167] At 1312, the Tx UE 1304 may generate and transmit the PSSCH to the Rx UE 1306 at a transmission power based on the priority indicator and PCP included in the scheduling DCI. For example, the priority indicator included in the scheduling DCI may indicate that the PSSCH has a high priority (e.g., associated with a URLLC PSSCH). In this example, the Tx UE 1304 may boost the transmission power of the PSSCH based on the PCP included in the scheduling DCI.

[0168] FIG. 14 is a signaling diagram illustrating exemplary signaling between a base station (e.g., gNB) 1402, a transmitting (Tx) UE 1404, and a receiving (Rx) UE 1406 for feedback information based on priority according to some aspects. The base station 1402 may correspond to any of the base stations or other scheduling entities illustrated in any of FIGs. 1, 3, 6-8, and/or 13. In addition, the Tx UE 1404 and Rx UE 1406 may correspond to any of the UEs, sidelink devices, V2X devices, D2D devices, IIoT devices, or other scheduled entities illustrated in any of FIGs. 1, 3, 6-8, and/or 13. [0169] At 1408, the Tx UE 1404 may transmit a scheduling request to the base station 1402 to schedule a sidelink transmission (e.g., PSSCH) from the Tx UE 1404 to the Rx UE 1406. The scheduling request may include a priority indicator for the PSSCH. The priority indicator may indicate a requested priority (e.g., priority level) for the PSSCH. For example, the priority indicator may be a single bit priority indicator requesting either a low priority or high priority or a multi-bit priority indicator requesting one of three or more priority levels.

[0170] At 1410, the base station 1402 may generate and transmit scheduling DCI (e.g., DCI 1200 shown in FIG. 12) to the Tx UE 1404 scheduling the sidelink transmission. The scheduling DCI may include scheduling information for the PSSCH. For example, the scheduling information may include resources allocated to the PSSCH and a priority indicator (PI) indicating the priority assigned to the PSSCH. In some examples, the scheduling information may further include a power control parameter (PCP) associated with the assigned priority indicator. The priority indicator included in the scheduling information may be the same as or different than the priority indicator requested by the Tx UE 1404 in the scheduling request.

[0171] At 1412, the Tx UE 1404 may generate and transmit the PSSCH with the priority indicator included in the scheduling DCI to the Rx UE 1406. For example, the priority indicator may be included within SCI-1 associated with the PSSCH. In some examples, the priority indicator associated with the PSSCH may indicate that the PSSCH has a high priority (e.g., associated with a URLLC PSSCH) or a low priority (e.g., associated with an eMBB PSSCH).

[0172] At 1414, the Rx UE 1406 may process (e.g., decode, demodulate, etc.) the PSSCH and select a HARQ codebook (CB) for generating sidelink feedback information (e.g., HARQ ACK/NACK) for the PSSCH. For example, the Rx UE 1406 may select a first HARQ CB for a low priority PSSCH and a second HARQ CB for a high priority PSSCH. The second HARQ CB may provide for more robust coding of the sidelink HARQ feedback information to improve reliability of the sidelink HARQ feedback information, and therefore, increase the probability of decoding the sidelink HARQ feedback information at the Tx UE 1404.

[0173] At 1416, the Rx UE 1406 may then generate the sidelink HARQ feedback information (e.g., a PSFCH) utilizing the selected HARQ CB and transmit the encoded sidelink HARQ feedback information to the Tx UE 1404. At 1418, the Tx UE 1404 may then process (e.g., decode, demodulate, etc.) the sidelink HARQ feedback information and select a HARQ codebook (CB) for generating uplink feedback information corresponding to the sidelink feedback information to inform the base station 1402 of whether the Rx UE 1406 was able to receive and decode the PSSCH. Thus, the uplink HARQ feedback information (e.g., HARQ ACK or NACK) is the same as the sidelink HARQ feedback information. For example, the Tx UE 1406 may select a first HARQ CB for a low priority PSSCH and a second HARQ CB for a high priority PSSCH. At 1420, the Rx UE 1404 may then generate the uplink HARQ feedback information (e.g., a PUCCH carrying the uplink HARQ feedback information) and transmit the uplink HARQ feedback information to the base station 1402.

[0174] FIG. 15 is a signaling diagram illustrating exemplary signaling between a base station (e.g., gNB) 1502, a transmitting (Tx) UE 1504, and receiving (Rx) UEs 1506 and 1508 for prioritized sidelink transmission according to some aspects. The base station 1502 may correspond to any of the base stations or other scheduling entities illustrated in any of FIGs. 1, 3, 6-8, 13 and/or 14. In addition, the Tx UE 1504 and each of the Rx UEs 1506 and 1508 may correspond to any of the UEs, sidelink devices, V2X devices, D2D devices, IIoT devices, or other scheduled entities illustrated in any of FIGs. 1, 3, 6-8, 13 and/or 14.

[0175] At 1510, the Tx UE 1504 may transmit a scheduling request to the base station 1502 to schedule a first sidelink transmission (e.g., first PSSCH) from the Tx UE 1504 to a first Rx UE (Rx UE-1) 1506. The scheduling request may include a priority indicator for the first PSSCH. The priority indicator may indicate a requested priority (e.g., priority level) for the first PSSCH. For example, the priority indicator may be a single bit priority indicator requesting either a low priority or high priority or a multi-bit priority indicator requesting one of three or more priority levels.

[0176] At 1512, the base station 1502 may generate and transmit scheduling DCI (e.g., DCI 1200 shown in FIG. 12) to the Tx UE 1504 scheduling the first sidelink transmission. The scheduling DCI may include scheduling information for the first PSSCH. For example, the scheduling information may include resources allocated to the first PSSCH and a first priority indicator indicating the priority assigned to the first PSSCH. In some examples, the scheduling information may further include a power control parameter (PCP) associated with the assigned priority indicator. The priority indicator included in the scheduling information may be the same as or different than the priority indicator requested by the Tx UE 1504 in the scheduling request. [0177] At 1514, the Tx UE 1504 may transmit a scheduling request to the base station 1502 to schedule an additional transmission. The additional transmission may be an uplink transmission from the Tx UE 1504 to the base station 1502 or a second sidelink transmission (e.g., second PSSCH) from the Tx UE 1504 to a second Rx UE (Rx UE-2) 1508, the latter being illustrated in FIG. 15. The scheduling request may include a priority indicator for the additional transmission. The priority indicator may indicate a requested priority (e.g., priority level) for the additional transmission. For example, the priority indicator may be a single bit priority indicator requesting either a low priority or high priority or a multi-bit priority indicator requesting one of three or more priority levels.

[0178] At 1516, the base station 1502 may generate and transmit scheduling DCI (e.g., DCI 1200 shown in FIG. 12) to the Tx UE 1504 scheduling the second sidelink transmission. The scheduling DCI may include scheduling information for the second PSSCH (or other additional transmission, such as an uplink transmission). For example, the scheduling information may include resources allocated to the second PSSCH and a second priority indicator indicating the priority assigned to the second PSSCH. In some examples, the scheduling information may further include a power control parameter (PCP) associated with the assigned priority indicator. The priority indicator included in the scheduling information may be the same as or different than the priority indicator requested by the Tx UE 1504 in the scheduling request for the second (additional) transmission.

[0179] At 1518, the Tx UE 1504 may detect an overlap between the resources scheduled for the first PSSCH and the resources scheduled for the second PSSCH. At 1520, the Tx UE 1504 may then cancel one of the first PSSCH or the second PSSCH based on the respective priorities assigned to each of the first PSSCH and the second PSSCH by the base station 1502. For example, the second priority indicator assigned to the second PSSCH may indicate a higher priority than the first priority indicator assigned to the first PSSCH. Therefore, in the example shown in FIG. 15, at 1522, the Tx UE 1504 may transmit the second PSSCH with the second priority indicator to the RX UE-2 1508 and cancel the first PSSCH to the RX UE-1 1506.

[0180] At 1524, the Tx UE 1504 may then optionally transmit a preemption indication to the Rx UE-1 1506 indicating cancellation of the first PSSCH. For example, the preemption indication may be transmitted to the Rx UE-1 1506 when the Rx UE-1 is in coverage of the base station 1502, and therefore, has received the scheduling DCI scheduling the first PSSCH from the base station 1502. [0181] The example shown in FIG. 15 depicts prioritization between overlapping sidelink transmissions. In other examples, the Tx UE 1504 may similarly prioritize between a sidelink transmission and an uplink transmission. For example, at 1514, the Tx UE may transmit a scheduling request for scheduling an uplink transmission to the base station 1502, and the scheduling DCI transmitted at 1516 from the base station 1502 to the Tx UE 1504 may include scheduling information (including a priority indicator) for the uplink transmission. The Tx UE 1504 may then detect an overlap between resources scheduled for the sidelink transmission and the uplink transmission and cancel one of the sidelink transmission or the uplink transmission based on the respective priorities assigned to the sidelink transmission and uplink transmission at 1518 and 1520. In examples in which the sidelink transmission (e.g., first PSSCH) is cancelled, the Tx UE 1504 may further transmit the preemption information to the Rx UE-1 1506 at 1524.

[0182] In examples in which the cancellation behavior information for the cancellation indication indicates a hard cancellation of a sidelink transmission within at least overlapping resources between the sidelink transmission and an additional (e.g., higher priority) transmission, the transmitting UE may further be configured to facilitate resumption of the sidelink transmission within resources allocated to the sidelink transmission that are outside of the overlapping resources. For example, resumption may occur within non-overlapping time resources (e.g., symbols) and/or non-overlapping frequency resources. Thus, in this example, the transmitting UE may cancel the sidelink transmission within at least the indicated overlapping resources and transmit the sidelink transmission based on remaining resources (e.g., non-cancelled resources) of the scheduled resources for the sidelink transmission.

[0183] FIG. 16 is a diagram illustrating an example of a hard cancellation of resources 1602 allocated to a sidelink transmission 1600 according to some aspects. As described above, a transmitting UE may receive control information including a cancellation indication indicating at least overlapping resources 1604 between the scheduled resources 1602 for the sidelink transmission 1600 and additional resources scheduled for an additional transmission. As used herein, the term scheduled resources 1602 includes both time resources (e.g., symbols of one or more slots) and frequency resources (e.g., one or more sub-channels, each including a number of RBs). In some examples, the control information may further include cancellation behavior information including a cancellation type of the cancellation indication. For example, the cancellation type may include a hard cancellation type or a soft cancellation type. [0184] In examples in which the cancellation type is the hard cancellation type, the transmitting UE may cancel the sidelink transmission 1600 in cancelled resources 1606 including at least the overlapping resources 1604 indicated in the cancellation indication. In some examples, the transmitting UE may determine the cancelled resources 1606 based on a cancellation behavior of the transmitting UE, which may be configured by the network (e.g., via the cancellation behavior information in the control information carrying the cancellation indication or RRC signaling) or pre-configured on the transmitting UE (e.g., by the original equipment manufacturer (OEM) based on, for example, 3GPP standards or specifications).

[0185] For example, as shown in FIG. 16, the cancelled resources 1606 include a cancelled portion of the time resources of the scheduled resources 1602 and a cancelled portion of the frequency resources of the scheduled resources 1602 within the cancelled portion of the time resources. In an example, the cancelled resources 1606 can include both the overlapping cancelled resources 1604 and non-overlapping cancelled resources 1608 (e.g., non-overlapping time and frequency resources) adjacent to the overlapping resources 1604 starting with the first symbol of the overlapping resources 1604. In the example shown in FIG. 16, the cancelled non-overlapping resources 1608 may include all scheduled resources 1602 (time-frequency resources) that are outside of the overlapping resources 1604 starting with the first symbol of the overlapping resources 1604. Thus, the transmitting UE may cancel the sidelink transmission from a first symbol of the overlapping resources 1604 to a last symbol of the scheduled resources 1602 of the sidelink transmission. In some examples, the cancelled non-overlapping resources 1608 may be configured via the cancellation indication or RRC signaling.

[0186] The transmitting UE may then transmit the sidelink transmission 1600 within remaining resources 1610 of the scheduled resources 1602. The remaining resources 1610 may include resources scheduled prior to the first symbol of the overlapping resources 1604. In some examples, the transmitting UE may transmit the sidelink transmission via the remaining resources 1610 based on the amount of remaining resources. For example, the transmitting UE may transmit the sidelink transmission via the remaining resources in response to a remaining resource percentage (e.g., the percentage of remaining resources of the scheduled resources) being greater than a threshold. Thus, the transmitting UE may cancel the sidelink transmission in all scheduled resources 1602 (e.g., not transmit the sidelink transmission) in response to the remaining resource percentage being less than or equal to the threshold. [0187] In the example shown in FIG. 16, there is no resumption of the sidelink transmission in any of the non-overlapping resources 1608. This may result in the non overlapping resources being wasted (e.g., not used for any sidelink transmission). In other examples, the transmitting UE may resume the sidelink transmission in scheduled resources 1602 that are outside of the overlapping resources 1604, but that occur at the same time and/or subsequent to the overlapping resources 1604 (e.g., the non-overlapping resources 1608), as shown and described in more detail in FIGs. 20-23B below.

[0188] FIG. 17 is a diagram illustrating an example of resumption of a sidelink transmission 1700 based on a hard cancellation of resources 1702 allocated to the sidelink transmission 1700 according to some aspects. In the example shown in FIG. 17, the transmitting UE may cancel the sidelink transmission 1700 in cancelled resources 1706 including a cancelled portion of the time resources of the scheduled resources 1702 and a cancelled portion of the frequency resources of the scheduled resources 1702 within the cancelled portion of the time resources. For example, the cancelled resources 1706 can include the overlapping resources 1704 indicated by the cancellation indication with the hard cancellation type and cancelled non-overlapping resources 1708 adjacent the overlapping resources starting with the first symbol of the overlapping resources 1704.

[0189] In the example shown in FIG. 17, the cancelled non-overlapping resources 1708 include a portion (e.g., less than all) of the scheduled resources 1702 that are outside of the overlapping resources 1704 starting with the first symbol of the overlapping resources 1704. As a result, the transmitting UE may use the non-cancelled resources starting with the first symbol of the overlapping resources 1704 to resume the sidelink transmission 1700. For example, the transmitting UE may transmit a first portion of the sidelink transmission 1700 via a first set of resources 1710a of the scheduled resources 1702 and a second portion of the sidelink transmission 1700 (e.g., a resumed portion of the sidelink transmission) via a second set of resources 1710b of the scheduled resources 1702, where the first set of resources 1710a and the second set of resources 1710b are separated by the overlapping resources 1704. In this example, the remaining resources on which the sidelink transmission 1700 is transmitted include both the first and second sets of resources 1710a and 1710b.

[0190] In some examples, as shown in FIG. 17, the cancelled resources 1706 may include all of the frequency resources of the scheduled resources 1702 within the cancelled portion of the time resources (e.g., within the overlapping symbols in the overlapping resources 1704). In some examples, the transmitting UE may resume the sidelink transmission via all frequency resources of the first non-overlapping symbol subsequent to the overlapping resources 1704. In other examples, as shown in FIG. 17, the cancelled non-overlapping resources 1708 may provide a gap between the overlapping resources 1704 utilized for the additional transmission and the second set of resources 1710b utilized for the second portion of the sidelink transmission in each of a time domain and a frequency domain. Thus, the transmitting UE may resume the sidelink transmission after a gap (e.g., at least one symbol) in time from the last symbol of the overlapping resources 1704. As such, the cancelled non-overlapping resources 1708 with sidelink transmission resumption may be referred to herein as gap resources 1708. In some examples, the gap resources 1708 may be configured via the cancellation indication or RRC signaling.

[0191] In some examples, the second portion of the sidelink transmission transmitted via the second set of resources 1710b may be different than the first portion of the sidelink transmission transmitted via the first set of resources 1710a to improve the decoding probability of the receiving UE. For example, the first portion of the sidelink transmission and the second portion of the sidelink transmission may each include different sets of coded bits corresponding to the sidelink transmission. In some examples, the second portion of the sidelink transmission may include an additional reference signal or different rate-matching of the coded bits. For example, the transmitting UE may modify a rate matching behavior of the sidelink transmission based on the cancelled resources 1706 indicated by the cancellation indication. In some examples, the transmitting UE may maintain phase continuity between the first portion of the sidelink transmission and the second portion of the sidelink transmission based on the cancelled resources 1706.

[0192] FIG. 18 is a diagram illustrating another example of resumption of a sidelink transmission 1800 based on a hard cancellation of resources 1802 allocated to a sidelink transmission 1800 according to some aspects. In the example shown in FIG. 18, the transmitting UE may cancel the sidelink transmission 1800 in cancelled resources including a cancelled portion of the time resources of the scheduled resources 1802 and a cancelled portion of the frequency resources of the scheduled resources 1802 within the cancelled portion of the time resources. In this example, the cancelled portion of the frequency resources may include all of the frequency resources in at least a first symbol of the overlapping resources 1804 indicated by the cancellation indication with the hard cancellation type and a portion of the frequency resources in the remaining symbols of the overlapping resources 1804. In addition, the cancelled portion of the time resources may include all of the symbols of the overlapping resources 1804 and at least one additional symbol following the last symbol of the overlapping resources 1804. Thus, the cancelled resources can include the overlapping resources 1804 and gap resources 1806 adjacent the overlapping resources. Here, the gap resources 1806 may be defined by the cancelled portions of the time and frequency resources outside of the overlapping resources 1804. In addition, the gap resources 1806 may be configured via the cancellation indication or RRC signaling.

[0193] As in the example shown in FIG. 20, the transmitting UE may transmit a first portion of the sidelink transmission 1800 via a first set of resources 1808a of the scheduled resources 1802 and a second portion of the sidelink transmission 1800 via a second set of resources 1808b of the scheduled resources 1802, where the second set of resources 1808b is separated in time and frequency from the overlapping resources 1804 by the gap resources 1806. In this example, the remaining resources on which the sidelink transmission 1800 is transmitted include both the first and second sets of resources 1808a and 1808b.

[0194] In particular, as shown in FIG. 18, the second portion of the sidelink transmission transmitted via the second set of resources 1808b includes a part of the cancelled portion of the time resources and a part of the frequency resources of the scheduled resources 1802 outside of the cancelled portion of the frequency resources (e.g., outside of the frequency resources of the overlapping resources 1804). In this example, the transmitting UE may further transmit an additional reference signal, such as a sidelink phase-tracking reference signal (PT-RS) 1810, to facilitate phase jump estimation by the receiving UE between the first portion of the sidelink transmission and the second portion of the sidelink transmission. In addition, the gap resources 1806 may be configured to provide sufficient time for preparing the sidelink PT-RS. The transmitting UE may transmit the PT-RS 1810 across all time resources of the second set of resources 1808b utilized for the second portion of the sidelink transmission. For example, the transmitting UE may transmit the PT-RS 1810 from a first symbol of the part of the cancelled portion of the time resources to a last symbol of the scheduled resources 1802 for the sidelink transmission.

[0195] In some examples, the first portion of the sidelink transmission transmitted via the first set of resources 1808a may include at least one sidelink DM-RS. In this example, the sidelink PT-RS may include a repeated version of one of the sidelink DM-RSs. In some examples, a density of the sidelink PT-RS (e.g., the repeated sidelink DM-RS) in the time and frequency domains may be pre-configured (e.g., based on 3GPP standards or specification) or configured via the cancellation indication or RRC signaling. In addition, the sidelink PT-RS (e.g., repeated DM-RS) may have a scrambling or sequence pattern configured via RRC signaling. For example, the transmitting UE may receive an RRC configuration of the sidelink PT-RS (e.g., repeated DM-RS) indicating the scrambling pattern, sequence pattern, and/or density from a network entity (e.g., base station, such as a gNB). In some examples, the second portion of the sidelink transmission further comprises a sidelink DM-RS different than the sidelink PT-RS. In this example, the transmitting UE may transmit the sidelink PT-RS across one or more symbols of the second set of resources 1808b utilized for the second portion of the sidelink transmission that are devoid of the sidelink DM-RS. The receiving UE may further be notified of the sidelink PT-RS (e.g., repeated DM-RS) configuration via, for example, the cancellation indication, RRC signaling, and/or the preemption indication.

[0196] In some examples, the transmitting UE may resume the sidelink transmission to transmit the sidelink transmission via both the first set of resources 1808a and the second set of resources 1808b of the remaining resources based on the amount of the second set of resources 1808b. For example, the transmitting UE may transmit the sidelink transmission via the second set of resources 1808b of the remaining resources in response to a remaining resource percentage of the second set of resources 1808b (e.g., the percentage of second set of resources 1808b of the scheduled resources 1802) being greater than a threshold. The transmitting UE may transmit the sidelink transmission via only the first set of resources 1808a in response to the remaining resource percentage being less than or equal to the threshold.

[0197] FIG. 19 is a diagram illustrating another example of resumption of a sidelink transmission 1900 based on a hard cancellation of resources 1902 allocated to the sidelink transmission 1900 according to some aspects. In the example shown in FIG. 19, the transmitting UE may cancel the sidelink transmission 1900 in cancelled resources including a cancelled portion of the time resources of the scheduled resources 1902 and a cancelled portion of the frequency resources of the scheduled resources 1902 within the cancelled portion of the time resources. In this example, the cancelled portion of the time resources may include all of the symbols of the overlapping resources 1904 indicated by the cancellation indication with the hard cancellation type and at least one additional symbol following the last symbol of the overlapping resources 1904. In addition, the cancelled portion of the frequency resources may include all of the frequency resources in all of the cancelled time resources. Thus, the cancelled resources can include the overlapping resources 1904 and gap resources 1906 adjacent the overlapping resources. Here, the gap resources 1906 may be defined by the cancelled portions of the time and frequency resources outside of the overlapping resources 1904. In addition, the gap resources 1906 may be configured via the cancellation indication or RRC signaling.

[0198] As in the example shown in FIG. 21, the transmitting UE may transmit a first portion of the sidelink transmission 1900 via a first set of resources 1908a of the scheduled resources 1902 and a second portion of the sidelink transmission 1900 via a second set of resources 1908b of the scheduled resources 1902, where the second set of resources 1908b is separated in time and frequency from the overlapping resources 1904 by the gap resources 1906. In this example, the remaining resources on which the sidelink transmission 1900 is transmitted include both the first and second sets of resources 1908a and 1908b.

[0199] In this example, the transmitting UE may further transmit an additional reference signal, such as a sidelink phase-tracking reference signal (PT-RS) 1910, to facilitate phase jump estimation by the receiving UE between the first portion of the sidelink transmission and the second portion of the sidelink transmission. The transmitting UE may transmit the PT-RS 1910 across at least a portion of the time resources of the second set of resources 1908b utilized for the second portion of the sidelink transmission. For example, the transmitting UE may transmit the PT-RS 1910 from a second symbol of the second set of resources 1908b to a last symbol of the scheduled resources 1902 for the sidelink transmission. In this example, the transmitting UE may further include an AGC symbol 1912 as the first symbol of the second set of resources 1908b for AGC settling of the second portion of the sidelink transmission. In some examples, the AGC symbol 1912 may include a copy of the second symbol of the second set of resources 1908b for AGC calibration. In other examples, the AGC symbol 1912 may include a pre-configured reference signal for AGC calibration. The receiving UE may further be notified of the sidelink PT-RS 1910 and AGC symbol 1912 configuration via, for example, the cancellation indication, RRC signaling, and/or the preemption indication.

[0200] In some examples, the transmitting UE may resume the sidelink transmission to transmit the sidelink transmission via both the first set of resources 1908a and the second set of resources 1908b of the remaining resources based on the amount of the second set of resources 1908b (e.g., resume resources). For example, the transmitting UE may transmit the sidelink transmission via the second set of resources 1908b of the remaining resources in response to a resume resource percentage of the second set of resources 1908b (e.g., the percentage of second set of resources 1908b of the scheduled resources 1902) being greater than a threshold. The transmitting UE may transmit the sidelink transmission via only the first set of resources 1908a in response to the resume resource percentage being less than or equal to the threshold.

[0201] FIGs. 20A and 20B are diagrams illustrating other examples of resumption of a sidelink transmission 2000 based on a hard cancellation of resources 2002 allocated to the sidelink transmission 2000 according to some aspects. The examples shown in FIGs. 20A and 20B illustrate different configurations of the sidelink transmission (e.g., sidelink transmissions 2000a and 2000b) based on the cancellation behavior configured for the sidelink transmission. Thus, each of FIGs. 20A and 20B illustrate different sidelink transmissions 2000a and 2000b based on the same set of scheduled resources 2002 and the same overlapping resources 2004 indicated by a cancellation indication with the hard cancellation type, for simplicity.

[0202] Based on the cancellation behavior associated with the cancellation indication, the transmitting UE may cancel each of the sidelink transmissions 2000a and 2000b in cancelled resources including a cancelled portion of the time resources of the scheduled resources 2002 and a cancelled portion of the frequency resources of the scheduled resources 2002 within the cancelled portion of the time resources. In the example shown in FIG. 20A, the cancelled portion of the time resources may include all of the symbols of the overlapping resources 2004 and at least one additional symbol following the last symbol of the overlapping resources 2004. In addition, the cancelled portion of the frequency resources may include a portion of the frequency resources in all of the cancelled time resources. In the example shown in FIG. 20B, the cancelled portion of the time resources may include all of the symbols of the overlapping resources 2004 and at least one additional symbol following the last symbol of the overlapping resources 2004. In addition, the cancelled portion of the frequency resources may include all of the frequency resources in all of the cancelled time resources.

[0203] Thus, in each of FIGs. 20A and 20B, the cancelled resources can include the overlapping resources 2004 and respective gap resources 2006a and 2006b adjacent the overlapping resources. Here, the gap resources 2006a and 2006b may be defined by the cancelled portions of the time and frequency resources outside of the overlapping resources 2004 in each of FIGs. 20A and 20B. In addition, the gap resources 2006a and 2006b (e.g., the cancellation behavior) may be configured via the cancellation indication or RRC signaling.

[0204] As in the example shown in FIG. 22, in each of FIGs. 20 A and 20B, the transmitting UE may transmit a first portion of the sidelink transmission 2000 via a first set of resources 2008a of the scheduled resources 2002 and a second portion of the sidelink transmission 2000 via a second set of resources 2008b of the scheduled resources 2002, where the second set of resources 2008b is separated in time and frequency from the overlapping resources 2004 by the gap resources 2006. In this example, the remaining resources on which the sidelink transmission 2000 is transmitted include both the first and second sets of resources 2008a and 2008b.

[0205] In this example, the transmitting UE may further transmit an additional reference signal, such as a sidelink phase-tracking reference signal (PT-RS) 2010, to facilitate phase jump estimation by the receiving UE between the first portion of the sidelink transmission and the second portion of the sidelink transmission, as described above in connection with FIG. 22. In the example shown in FIG. 20A, the second set of resources 2008b is adjacent the first set of resources 2008b in time over a portion of the frequency resources. Thus, as shown in FIG. 20A, the sidelink PT-RS 2010 can be transmitted across all symbols of the scheduled resources 2002 of the sidelink transmission via the common frequency resources between the first set of resources 2008a and the second set of resources 2008b. In the example shown in FIG. 20B, the second set of resources 2008b is separated in both time and frequency from the first set of resources 2008b. Thus, as shown in FIG. 20B, the sidelink PT-RS 2010 can be transmitted across all symbols of the second set of resources 2008b. The receiving UE may further be notified of the sidelink PT-RS 2010 configuration via, for example, the cancellation indication, RRC signaling, and/or the preemption indication.

[0206] FIG. 21 is a block diagram illustrating an example of a hardware implementation for a wireless communication device 2100 employing a processing system 2114. For example, the wireless communication device 2100 may correspond to a sidelink device, such as a V2X device, D2D device or other UE or wireless communication device configured for sidelink communication, as shown and described above in reference to FIGs. 1, 3, 6, 7, and/or 13-15.

[0207] The wireless communication device 2100 may be implemented with a processing system 2114 that includes one or more processors 2104. Examples of processors 2104 include microprocessors, microcontrollers, digital signal processors (DSPs), field programmable gate arrays (FPGAs), programmable logic devices (PLDs), state machines, gated logic, discrete hardware circuits, and other suitable hardware configured to perform the various functionality described throughout this disclosure. In various examples, the wireless communication device 2100 may be configured to perform any one or more of the functions described herein. That is, the processor 2104, as utilized in the wireless communication device 2100, may be used to implement any one or more of the processes and procedures described below.

[0208] The processor 2104 may in some instances be implemented via a baseband or modem chip and in other implementations, the processor 2104 may include a number of devices distinct and different from a baseband or modem chip (e.g., in such scenarios as may work in concert to achieve examples discussed herein). And as mentioned above, various hardware arrangements and components outside of a baseband modem processor can be used in implementations, including RF-chains, power amplifiers, modulators, buffers, interleavers, adders/summers, etc.

[0209] In this example, the processing system 2114 may be implemented with a bus architecture, represented generally by the bus 2102. The bus 2102 may include any number of interconnecting buses and bridges depending on the specific application of the processing system 2114 and the overall design constraints. The bus 2102 links together various circuits including one or more processors (represented generally by the processor 2104), a memory 2105, and computer-readable media (represented generally by the computer-readable medium 2106). The bus 2102 may also link various other circuits such as timing sources, peripherals, voltage regulators, and power management circuits, which are well known in the art, and therefore, will not be described any further.

[0210] A bus interface 2108 provides an interface between the bus 2102, a transceiver 2110, and a power source 2130. The transceiver 2110 provides a communication interface or a means for communicating with various other apparatus over a transmission medium (e.g., air interface). Depending upon the nature of the apparatus, a user interface 2112 (e.g., keypad, display, touch screen, speaker, microphone, control knobs, etc.) may also be provided. Of course, such a user interface 2112 is optional, and may be omitted in some examples.

[0211] The processor 2104 is responsible for managing the bus 2102 and general processing, including the execution of software stored on the computer-readable medium 2106. The software, when executed by the processor 2104, causes the processing system 2114 to perform the various functions described below for any particular apparatus. The computer-readable medium 2106 and the memory 2105 may also be used for storing data that is manipulated by the processor 2104 when executing software. For example, the memory 2105 may store one or more of a cancellation indication (Cl) 2116, a preemption indication (PI) 2118, one or more threshold(s) 2120, or HARQ codebooks (CBs) 2122 used by the processor 2104 in generating and/or processing sidelink transmissions.

[0212] One or more processors 2104 in the processing system may execute software.

Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise. The software may reside on a computer-readable medium 2106.

[0213] The computer-readable medium 2106 may be a non-transitory computer-readable medium. A non-transitory computer-readable medium includes, by way of example, a magnetic storage device (e.g., hard disk, floppy disk, magnetic strip), an optical disk (e.g., a compact disc (CD) or a digital versatile disc (DVD)), a smart card, a flash memory device (e.g., a card, a stick, or a key drive), a random access memory (RAM), a read only memory (ROM), a programmable ROM (PROM), an erasable PROM (EPROM), an electrically erasable PROM (EEPROM), a register, a removable disk, and any other suitable medium for storing software and/or instructions that may be accessed and read by a computer. The computer-readable medium 2106 may reside in the processing system 2114, external to the processing system 2114, or distributed across multiple entities including the processing system 2114. The computer-readable medium 2106 may be embodied in a computer program product. By way of example, a computer program product may include a computer-readable medium in packaging materials. In some examples, the computer-readable medium 2106 may be part of the memory 2105. Those skilled in the art will recognize how best to implement the described functionality presented throughout this disclosure depending on the particular application and the overall design constraints imposed on the overall system.

[0214] In some aspects of the disclosure, the processor 2104 may include circuitry configured for various functions. For example, the processor 2104 may include communication and processing circuitry 2142, configured to communicate with one or more sidelink devices (e.g., other UEs) via respective sidelinks (e.g., PC5 interfaces). In addition, the communication and processing circuitry 2142 may be configured to communicate with a network entity (e.g., a base station, such as s gNB or eNB) via a Uu link. In some examples, the communication and processing circuitry 2142 may include one or more hardware components that provide the physical structure that performs processes related to wireless communication (e.g., signal reception and/or signal transmission) and signal processing (e.g., processing a received signal and/or processing a signal for transmission). For example, the communication and processing circuitry 2142 may include one or more transmit/receive chains.

[0215] In some implementations where the communication involves receiving information, the communication and processing circuitry 2142 may obtain information from a component of the wireless communication device 2100 (e.g., from the transceiver 2110 that receives the information via radio frequency signaling or some other type of signaling suitable for the applicable communication medium), process (e.g., decode) the information, and output the processed information. For example, the communication and processing circuitry 2142 may output the information to another component of the processor 2104, to the memory 2105, or to the bus interface 2108. In some examples, the communication and processing circuitry 2142 may receive one or more of signals, messages, other information, or any combination thereof. In some examples, the communication and processing circuitry 2142 may receive information via one or more channels. In some examples, the communication and processing circuitry 2142 may include functionality for a means for receiving. In some examples, the communication and processing circuitry 2142 may include functionality for a means for processing, including a means for demodulating, a means for decoding, etc.

[0216] In some implementations where the communication involves sending (e.g., transmitting) information, the communication and processing circuitry 2142 may obtain information (e.g., from another component of the processor 2104, the memory 2105, or the bus interface 2108), process (e.g., modulate, encode, etc.) the information, and output the processed information. For example, the communication and processing circuitry 2142 may output the information to the transceiver 2110 (e.g., that transmits the information via radio frequency signaling or some other type of signaling suitable for the applicable communication medium). In some examples, the communication and processing circuitry 2142 may send one or more of signals, messages, other information, or any combination thereof. In some examples, the communication and processing circuitry 2142 may send information via one or more channels. In some examples, the communication and processing circuitry 2142 may include functionality for a means for sending (e.g., a means for transmitting). In some examples, the communication and processing circuitry 2142 may include functionality for a means for generating, including a means for modulating, a means for encoding, etc.

[0217] In some examples, the communication and processing circuitry 2142 may be configured to receive sidelink scheduling information scheduling a sidelink transmission from a transmitting wireless communication device to a receiving wireless communication device. The scheduling information may include, for example, scheduled resources for the sidelink transmission and/or a cast type (e.g., unicast, groupcast, or broadcast) of the sidelink transmission. The sidelink scheduling information may be received, for example, via downlink control information (DCI) format 3_0.

[0218] In some examples, the DCI 3_0 can include a priority indicator for the sidelink transmission. For example, the priority indicator may include a single bit priority indicator or a multi-bit priority indicator. In examples in which the wireless communication device 2100 is the transmitting wireless communication device, the communication and processing circuitry 2142 may further be configured to transmit the sidelink transmission to the receiving wireless communication device based on the scheduling information that includes the priority indicator. In some examples, the scheduling information may further include a power control parameter associated with the priority indicator. In this example, the communication and processing circuitry 2142 may further be configured to control the power source 2130 to transmit the sidelink transmission at a transmission power based on the power control parameter. In some examples, the communication and processing circuitry 2142 may further be configured to transmit the priority indicator for the sidelink transmission to the receiving wireless communication device. In some examples, the communication and processing circuitry 2142 may further be configured to transmit a scheduling request including the priority indicator for the sidelink transmission to the network entity.

[0219] The communication and processing circuitry 2142 may further be configured to receive control information including a cancellation indication 2116 from a network entity. The cancellation indication 2116 may indicate at least an overlap between a portion of the resources allocated to the sidelink transmission and an additional transmission. Thus, the cancellation indication 2116 may indicate at least overlapping resources between the scheduled resources for the sidelink transmission and additional resources scheduled for the additional transmission. For example, the cancellation indication 2116 may include resource information identifying at least the portion of the resources (e.g., the overlapping resources). In some examples, the resource information may include a plurality of bits, each corresponding to a resource block group of a plurality of resource block groups and a symbol of a plurality of symbols. In some examples, each bit maps to either an uplink symbol or a flexible symbol. In other examples, each bit maps to only an uplink symbol. In some examples, the control information may include DCI format 2_4 or a new DCI format.

[0220] In some examples, the control information may further include cancellation behavior information associated with the cancellation indication 2116. For example, the cancellation behavior information may include one or more of a priority indicator of the additional transmission, a cast type of the additional transmission, a cancellation type (e.g., a hard cancellation indicator or a soft cancellation indicator), or a power control parameter. In some examples, the wireless communication device 2100 receiving the sidelink scheduling information and/or the control information including the cancellation indication 2116 may be the transmitting wireless communication device or the receiving wireless communication device.

[0221] The communication and processing circuitry 2142 may further be configured to receive a cancellation application indicator indicating whether the cancellation indication 2116 is applicable to one or more of uplink transmissions or sidelink transmissions. For example, the communication and processing circuitry 2142 may be configured to receive the cancellation application indicator as a dedicated field within the control information, as a dedicated format of the control information, via radio resource control (RRC) signaling, as a cancellation indicator radio network temporary identifier (CI-RNTI) utilized to scramble a cyclic redundancy check (CRC) of the control information, or as a search space configuration associated with the control information. In some examples, the cancellation application indicator may indicate that the cancellation indication is a sidelink cancellation indication applicable to a sidelink transmission scheduled on the overlapping resources. In other examples, the cancellation application indicator may indicate that the cancellation indication is applicable to both a sidelink transmission and an uplink transmission, each scheduled on the overlapping resources.

[0222] The communication and processing circuitry 2142 may further be configured to communicate (e.g., transmit or receive) a preemption indication 2118. For example, the preemption indication 2118 may be communicated from the transmitting wireless communication device transmitting the sidelink transmission to the receiving wireless communication device within a retransmission resource for the sidelink transmission, SCI-1, SCI-2, a si del ink MAC-CE, or a sidelink RRC message. In some examples, preemption scheduling information for the preemption indication 2118 may be included in the control information carrying the cancellation indication. The preemption indication 2118 may include preemption information associated with the overlapping resources. For example, the preemption indication 2118 may include at least one of resource information identifying at least the portion of the resources that overlaps with the additional transmission, a symbol index offset for a demodulation reference signal transmitted within the sidelink transmission, a puncturing pattern of the sidelink transmission, or a rate matching pattern of the sidelink transmission. In some examples, a receiving wireless communication device may receive the preemption information within the control information carrying the cancellation indication 2116 from the network entity. In this example, the preemption indication 2118 may additionally optionally be sent from the transmitting wireless communication device to the receiving wireless communication device.

[0223] The communication and processing circuitry 2142 may further be configured to communicate (e.g., transmit or receive) the sidelink transmission based on the cancellation indication 2116. In some examples, the communication and processing circuitry 2142 may be configured to transmit the sidelink transmission via remaining resources of the scheduled resources outside of cancelled resources including at least the overlapping resources. In some examples, the communication and processing circuitry 2142 may be configured to resume transmission of the sidelink transmission in scheduled resources outside of the overlapping resources based on the cancellation indication. For example, the communication and processing circuitry 2142 may be configured to resume transmission of the sidelink transmission on resources that are outside of the overlapping resources, but that occur at the same time and/or subsequent to the overlapping resources. In an example, the communication and processing circuitry 2142 may be configured to transmit a first portion of the sidelink transmission via a first set of resources of the scheduled resources and a second portion of the sidelink transmission (e.g., a resumed portion of the sidelink transmission) via a second set of resources of the scheduled resources. The first and second sets of resources may be separated by at least the overlapping resources.

[0224] In some examples, the communication and processing circuitry 2142 may further be configured to transmit a reference signal and/or an additional automatic gain control (AGC) symbol within the second portion of the sidelink transmission. The communication and processing circuitry 2142 may further be configured to execute communication and processing instructions (software) 2152 stored in the computer- readable medium 2106 to implement one or more of the functions described herein.

[0225] The processor 2104 may further include sidelink cancellation circuitry 2144, configured to receive the control information including the sidelink cancellation indication from the communication and processing circuitry 2142 and modify and/or selectively transmit a scheduled sidelink transmission based on the cancellation indication 2116. In some examples, the sidelink cancellation circuitry 2144 may be configured to modify and/or selectively transmit the scheduled sidelink transmission based on the cancellation indication 2116 and cancellation behavior defined for the wireless communication device (e.g., via the cancellation behavior information in the control information, via RRC signaling, or as pre-configured on the wireless communication device 2100).

[0226] For example, the sidelink cancellation circuitry 2144 may be configured to cancel the entire sidelink transmission (e.g., not transmit the sidelink transmission). For example, the sidelink cancellation circuitry 2144 may cancel the sidelink transmission in all scheduled resources based on an amount of overlapping or non-overlapping resources. In an example, the sidelink cancellation circuitry 2144 may cancel the sidelink transmission in all scheduled resources in response to a non-overlapping resource percentage (e.g., the percentage of non-overlapping resources of the scheduled resources) or a remaining resource percentage (e.g., the percentage of the remaining resources outside of the cancelled resources) being less than a threshold (e.g., a resource percentage threshold) 2120.

[0227] In some examples, the sidelink cancellation circuitry 2144 may further be configured to shift a DM-RS within the sidelink transmission (e.g., shift the DM-RS by an offset), delay the sidelink transmission (e.g., shift all symbols by an offset), puncture the sidelink transmission using a puncturing pattern based on the remaining resources utilized for the sidelink transmission, perform rate-matching of the sidelink transmission based on the remaining resources, and/or boost the transmission power of the sidelink transmission in the remaining resources based on the cancellation indication 2116 and the cancellation behavior defined for the wireless communication device 2100.

[0228] In some examples, the sidelink cancellation circuitry 2144 may be configured to modify the sidelink transmission based on the cancellation behavior information included in the control information carrying the cancellation indication. For example, the cancellation behavior information may include at least one of a priority indicator or a cast type (e.g., unicast, groupcast, or broadcast) of the additional transmission. In some examples, the sidelink cancellation circuitry 2144 may be configured to modify the sidelink transmission based on the cast type of the additional transmission and an additional cast type of the sidelink transmission.

[0229] In some examples, the sidelink cancellation circuitry 2144 may be configured to modify the sidelink transmission based on the priority indicator of the additional transmission and an additional priority indicator of the sidelink transmission (e.g., included in the scheduling information for the sidelink transmission). For example, the sidelink cancellation circuitry 2144 may be configured to cancel at least the portion of the resources (e.g., overlapping resources) for the sidelink transmission based on the additional priority indicator of the sidelink transmission indicating a lower priority than the priority indicator of the additional transmission. In examples in which the priority indicator is a multi-bit priority indicator, the sidelink cancellation circuitry 2144 may further compare the multi-bit priority indicator to a threshold (e.g., a multi-bit priority threshold) 2120 and modify (e.g., cancel at least the overlapping resources) the sidelink transmission in response to the multi-bit priority indicator being below the multi-bit priority threshold 2120.

[0230] In examples in which the additional transmission is an additional sidelink transmission scheduled for transmission by the wireless communication device 2100, the control information including the cancellation indication may correspond to sidelink scheduling DCI for the additional sidelink transmission. In this example, the sidelink cancellation circuitry 2144 may be configured to compare the respective priorities (e.g., as represented by the priority indicators) of each of the sidelink transmission and the additional sidelink transmission and cancel the entire sidelink transmission in response to the priority of the sidelink transmission being lower than the priority of the additional sidelink transmission.

[0231] In some examples, the cancellation behavior information includes a cancellation type (e.g., hard cancellation indicator or soft cancellation indicator) of the cancellation indication. In examples in which the cancellation type includes the soft cancellation indicator, the cancellation behavior information may further include a power control parameter associated with the soft cancellation indicator. In this example, the sidelink cancellation circuitry 2144 may be configured to control the power source 2130 to reduce a transmission power of the sidelink transmission within at least the portion of the resources (e.g., overlapping resources) based on the power control parameter. In other examples, when the cancellation type is the soft cancellation type, the sidelink cancellation circuitry 2144 may use the portion of the resources (e.g., overlapping resources) for active interference cancellation (AIC) to reduce emissions to other frequencies and/or tone reservation (TR) to improve the peak-to-average-power ratio (PAPR) of the sidelink transmission.

[0232] In some examples, the sidelink cancellation circuitry 2144 may be configured to cancel the sidelink transmission within cancellation resources including at least the overlapping resources and operate together with the communication and processing circuitry 2142 to transmit the sidelink transmission via remaining resources of the scheduled resources outside of the cancelled resources. For example, the sidelink cancellation circuitry 2144 may be configured to cancel the sidelink transmission from a first symbol of the overlapping resources to a last symbol of the scheduled resources of the sidelink transmission. In this example, the cancelled resources include all scheduled resources starting with the first symbol of the overlapping resources.

[0233] In other examples, the sidelink cancellation circuitry 2144 may be configured to resume the sidelink transmission in resources (e.g., resume resources) outside of the cancelled resources that occur in symbols associated with the overlapping resources or after the overlapping resources. In some examples, the sidelink cancellation circuitry 2144 may be configured to resume the sidelink transmission in the resume resources in response to a resume resource percentage of the resume resources being greater than a threshold (e.g., a resume resource threshold) 2120.

[0234] In examples in which sidelink resumption occurs, the sidelink cancellation circuitry 2144 may be configured to transmit a first portion of the sidelink transmission via a first set of resources of the scheduled resources and a second portion of the sidelink transmission via a second set of resources of the scheduled resources, where the first set of resources and the second set of resources are separated by the overlapping resources. In this example, the sidelink cancellation circuitry 2144 may be configured to cancel the sidelink transmission within the cancelled resources including the overlapping resources and gap resources adjacent the overlapping resources to provide a gap between the overlapping resources utilized for the additional transmission and the second set of resources utilized for the second portion of the sidelink transmission in each of a time domain and a frequency domain. In some examples, the sidelink cancellation circuitry 2144 may further be configured to modify a rate-matching behavior of the sidelink transmission based on the cancellation indication.

[0235] In some examples, the scheduled resources for the sidelink transmission include time resources and frequency resources, and the cancelled resources include a cancelled portion of the time resources of the scheduled resources, and a cancelled portion of the frequency resources within the cancelled portion of the time resources. In some examples, the cancelled portion of the frequency resources further includes all of the frequency resources of the scheduled resources within the cancelled portion of the time resources. In this example, the first portion of the sidelink transmission and the second portion of the sidelink transmission may each include different sets of coded bits corresponding to the sidelink transmission. In some examples, the sidelink cancellation circuitry 2144 may further be configured to maintain phase continuity between the first portion of the sidelink transmission and the second portion of the sidelink transmission based on the cancelled portion of the time resources.

[0236] In some examples, the sidelink cancellation circuitry 2144 may further be configured to transmit a reference signal within at least the second portion of the sidelink transmission. For example, the second portion of the sidelink transmission may include a part of the cancelled portion of the time resources and a part of the frequency resources outside of the cancelled portion of the frequency resources. In this example, the sidelink cancellation circuitry 2144 may be configured to transmit the reference signal across the second portion of the sidelink transmission in the time domain. For example, the sidelink cancellation circuitry 2144 may be configured to transmit the reference signal from a first symbol of the part of the cancelled portion of the time resources to a last symbol of the scheduled resources for the sidelink transmission. In some examples, the reference signal may include a sidelink phase-tracking reference signal (PT-RS). In some examples, the first portion of the sidelink transmission includes a sidelink DM-RS and the sidelink PT- RS includes a repeated version of the sidelink DM-RS. The sidelink DM-RS configuration may be received, for example, via RRC signaling.

[0237] In some examples, the second portion of the sidelink transmission includes a sidelink DM-RS. In this example, the sidelink cancellation circuitry 2144 may be configured to transmit the sidelink PT-RS across one or more symbols of the second portion of the sidelink transmission that are devoid of the sidelink DM-RS. In some examples, the sidelink cancellation circuitry 2144 may further be configured to transmit a first reference signal in a first symbol of the second portion of the sidelink transmission for automatic gain control training and transmit a second reference signal across one or more remaining symbols of the second portion of the sidelink transmission. In some examples, the sidelink cancellation circuitry 2144 may be configured to transmit the reference signal across all of the time resources of the sidelink transmission. The sidelink cancellation circuitry 2144 may further be configured to execute sidelink cancellation instructions (software) 2154 stored in the computer-readable medium 2106 to implement one or more of the functions described herein.

[0238] The processor 2104 may further include sidelink preemption circuitry 2146, configured to either generate and transmit a preemption indication indicating preemption information to a receiving wireless communication device or process a received sidelink transmission based on the preemption information. The preemption information may include at least one of resource information identifying at least the portion of the resources, a symbol index offset for a demodulation reference signal, a delayed transmission indication, a puncturing pattern of the sidelink transmission, a rate matching pattern of the sidelink transmission, or a power control parameter.

[0239] In examples in which the wireless communication device 2100 is a receiving wireless communication device, the sidelink preemption circuitry 2146 may be configured to operate together with the communication and processing circuitry 2142 to receive the preemption indication including the preemption information from the transmitting wireless communication device and/or the cancellation indication indicating the preemption information (e.g., the resource information and cancellation behavior information) from a network entity (e.g., a base station). In examples in which the preemption information is received from the transmitting wireless communication device, the sidelink preemption circuitry 2146 may be configured to receive the preemption indication within a retransmission resource for the sidelink transmission, first stage sidelink control information, second stage sidelink control information, a sidelink medium access control (MAC) control element (MAC-CE), or a sidelink radio resource control (RRC) message. In addition, the sidelink preemption circuitry 2146 may be configured to re-attempt decoding of the sidelink transmission based on the preemption indication. In examples in which the preemption information is received from the network entity, the sidelink preemption circuitry 2146 may be configured to receive the control information (e.g., DCI 2_4 or a new DCI format) including the cancellation indication from the network entity. In this example, the sidelink preemption circuitry 2146 may be configured to initially attempt decoding of the sidelink transmission based on the preemption information. The sidelink preemption circuitry 2146 may further be configured to execute sidelink preemption instructions (software) 2156 stored in the computer-readable medium 2106 to implement one or more of the functions described herein.

[0240] The processor 2104 may further include sidelink HARQ circuitry 2148, configured to receive and/or transmit acknowledgement information for the sidelink transmission using one of a plurality of HARQ codebooks (CBs) 2122 selected based on the priority associated with the sidelink transmission. Each HARQ CB 2122 may be associated with a respective priority indicator for sidelink transmissions. In addition, the HARQ CBs 2122 may include sidelink HARQ CBs and uplink HARQ CBs. In examples in which the wireless communication device 2100 is a receiving wireless communication device, the sidelink HARQ circuitry 2148 may be configured to receive the priority indicator associated with the sidelink transmission from the transmitting wireless communication device and select a HARQ CB 2122 corresponding to the priority indicator. The sidelink HARQ circuitry 2148 may then be configured to generate sidelink acknowledgement information (e.g., ACK/NACK) for the sidelink transmission and encode the sidelink acknowledgement information based on the selected HARQ CB 2122. The sidelink HARQ circuitry 2148 may then be configured to operate together with the communication and processing circuitry 2142 to transmit the sidelink acknowledgement entity to the transmitting wireless communication device.

[0241] In examples in which the wireless communication device 2100 is a transmitting wireless communication device, the sidelink HARQ circuitry 2148 may be configured to identify the priority indicator associated with the sidelink transmission (e.g., based on the scheduling information for the sidelink transmission). The sidelink HARQ circuitry 2148 may further be configured to receive the sidelink acknowledgement information from the receiving wireless communication device and decode the sidelink acknowledgement information based on the HARQ CB 2122 associated with the priority indicator of the sidelink transmission. The sidelink HARQ circuitry 2148 may further be configured to generate uplink acknowledgement information corresponding to the sidelink acknowledgement information, select an uplink HARQ CB 2122 based on the priority indicator associated with the sidelink transmission, and encode the uplink acknowledgement information based on the selected uplink HARQ CB 2122. The sidelink HARQ circuitry 2148 may then be configured to operate together with the communication and processing circuitry 2142 to transmit the uplink acknowledgement entity to the network entity. The sidelink HARQ circuitry 2148 may further be configured to execute sidelink HARQ instructions (software) 2158 stored in the computer-readable medium 2106 to implement one or more of the functions described herein.

[0242] FIG. 22 is a flow chart 2200 of an exemplary method for sidelink cancellation according to some aspects. As described below, some or all illustrated features may be omitted in a particular implementation within the scope of the present disclosure, and some illustrated features may not be required for implementation of all examples. In some examples, the method may be performed by the wireless communication device 2100, as described above and illustrated in FIG. 21, by a processor or processing system, or by any suitable means for carrying out the described functions.

[0243] At block 2202, the wireless communication device (e.g., a transmitting wireless communication device configured for sidelink communication) may receive sidelink scheduling information scheduling a sidelink transmission from the transmitting wireless communication device to a receiving wireless communication device from a network entity (e.g., a base station, such as a gNB) in the wireless communication network. The scheduling information can include resources allocated to the sidelink transmission. In some examples, the sidelink scheduling information may be received within DCI 3_0. In some examples, the scheduling information further includes a priority indicator indicating a priority of the sidelink transmission and/or a cast type (e.g., unicast, groupcast, or broadcast) of the sidelink transmission. For example, the communication and processing circuitry 2142 and transceiver 2110, shown and described above in connection with FIG. 21, may provide a means to receive the sidelink scheduling information.

[0244] At block 2204, the transmitting wireless communication device may receive control information from the network entity including a cancellation indication indicating at least an overlap between a portion of the resources allocated to the sidelink transmission and an additional transmission. In some examples, the control information includes downlink control information (DCI) format 2_4 or a new DCI format. In some examples, the cancellation indication includes resource information identifying at least the portion of the resources. The resource information can include a plurality of bits, each corresponding to a resource block group of a plurality of resource block groups and a symbol of a plurality of symbols. In some examples, each bit in the plurality of bits maps to one of an uplink symbol or a flexible symbol. In other examples, each bit in the plurality of bits maps to an uplink symbol. [0245] In some examples, the control information further includes cancellation behavior information associated with the cancellation indication. In some examples, the cancellation behavior information includes at least one of a priority indicator or a cast type of the additional transmission. In some examples, the cancellation behavior information includes a cancellation type of the cancellation indication. The cancellation type can include a hard cancellation indicator or a soft cancellation indicator. In some examples, the cancellation behavior information includes a power control parameter associated with the soft cancellation indicator. In some examples, the control information further includes preemption scheduling information for a preemption indication to be transmitted from the transmitting wireless communication device to the receiving wireless communication device.

[0246] In some examples, the transmitting wireless communication device may further receive a cancellation application indicator indicating whether the cancellation indication is applicable to one or more of uplink transmissions or sidelink transmissions. For example, the cancellation application indicator can include one of one or more cancellation indicator radio network temporary identifiers (CI-RNTIs). A cyclic redundancy check of the control information may be scrambled with a CI-RNTI of the one or more CI-RNTIs. As another example, the cancellation application indicator can include a search space configuration associated with the control information. The search space configuration can include respective search spaces or respective monitoring occasions within one or more search spaces, each of the respective search spaces or the respective monitoring occasions being associated with at least one of an uplink cancellation indication or a sidelink cancellation indication. For example, the communication and processing circuitry 2142 and transceiver 2110, shown and described above in connection with FIG. 21, may provide a means to receive the control information including the cancellation indication.

[0247] At block 2206, the transmitting wireless communication device may modify the sidelink transmission based on the cancellation indication. In some examples, the transmitting wireless communication device may modify the sidelink transmission based on the cancellation behavior information. In some examples, the cancellation behavior information may include at least one of the priority indicator or the cast type of the additional transmission. In this example, the transmitting wireless communication device may modify the sidelink transmission based on the priority indicator of the additional transmission and an additional priority indicator of the sidelink transmission received in the scheduling information for the sidelink transmission. In some examples, the transmitting wireless communication device may cancel at least the portion of the resources for the sidelink transmission based on the additional priority indicator of the sidelink transmission indicating a lower priority than the priority indicator of the additional transmission. In some examples, the additional priority indicator includes a multi-bit priority indicator. In this example, the wireless communication device may compare the multi-bit priority indicator with a threshold and modify the sidelink transmission based on the priority indicator of the additional transmission and the multi bit priority indicator of the sidelink transmission and in response to the multi-bit priority indicator being below the threshold. In some examples, the transmitting wireless communication device may modify the sidelink transmission based on the cast type of the additional transmission and an additional cast type of the sidelink transmission received in the scheduling information for the sidelink transmission.

[0248] In some examples, the cancellation behavior information may include the cancellation type (e.g., hard or soft cancellation indicator). In this example, the transmitting wireless communication device may cancel at least the portion of the resources for the sidelink transmission in response to the cancellation type comprising the hard cancellation indicator. In some examples, the cancellation behavior information further includes the power control parameter associated with the soft cancellation indicator. In this example, the transmitting wireless communication device may reduce a transmission power of the sidelink transmission within at least the portion of the resources based on the power control parameter in response to the cancellation type including the soft cancellation indicator. For example, the sidelink cancellation circuitry 2144, together with the communication and processing circuitry 2142 and transceiver 2110, shown and described above in connection with FIG. 21 may provide a means to modify the sidelink transmission.

[0249] At block 2208, the transmitting wireless communication device may further optionally transmit the preemption indication indicating preemption information associated with the cancellation indication to the receiving wireless communication device. For example, the transmitting wireless communication device may transmit the preemption indication in examples in which the receiving wireless communication device is out-of-coverage of the network entity or in response to modifying the sidelink transmission different than indicated by the cancellation indication. In some examples, the transmitting wireless communication device may transmit the preemption indication to the receiving wireless communication device within a retransmission resource for the sidelink transmission, first stage sidelink control information, second stage si del ink control information, a sidelink medium access control (MAC) control element (MAC- CE), or a sidelink radio resource control (RRC) message. In some examples, the preemption information includes at least one of resource information identifying at least the portion of the resources, a symbol index offset for a demodulation reference signal, a delayed transmission indication, a puncturing pattern of the sidelink transmission, a rate matching pattern of the sidelink transmission, or a power control parameter. For example, the sidelink preemption circuitry 2146, together with the communication and processing circuitry 2142 and transceiver 2110, shown and described above in connection with FIG. 21 may provide a means to transmit the preemption indication.

[0250] In one configuration, the wireless communication device 2100 includes means for receiving sidelink scheduling information scheduling a sidelink transmission from the transmitting wireless communication device to a receiving wireless communication device from a network entity in the wireless communication network, wherein the scheduling information comprises resources allocated to the sidelink transmission, as described in the present disclosure. The wireless communication device 2100 further includes means for receiving control information from the network entity, the control information comprising a cancellation indication indicating at least an overlap between a portion of the resources allocated to the sidelink transmission and an additional transmission and means for modifying the sidelink transmission based on the cancellation indication. In one aspect, the aforementioned means may be the processor 2104 shown in FIG. 21 configured to perform the functions recited by the aforementioned means. In another aspect, the aforementioned means may be a circuit or any apparatus configured to perform the functions recited by the aforementioned means.

[0251] Of course, in the above examples, the circuitry included in the processor 2104 is merely provided as an example, and other means for carrying out the described functions may be included within various aspects of the present disclosure, including but not limited to the instructions stored in the computer-readable storage medium 2106, or any other suitable apparatus or means described in any one of the FIGs. 1, 3, 6, 7, and/or 13-15, and utilizing, for example, the processes and/or algorithms described herein in relation to FIG. 22.

[0252] FIG. 23 is a flow chart 2300 of another exemplary method for sidelink cancellation according to some aspects. As described below, some or all illustrated features may be omitted in a particular implementation within the scope of the present disclosure, and some illustrated features may not be required for implementation of all examples. In some examples, the method may be performed by the wireless communication device 2100, as described above and illustrated in FIG. 21, by a processor or processing system, or by any suitable means for carrying out the described functions.

[0253] At block 2302, the wireless communication device (e.g., a receiving wireless communication device configured for sidelink communication) may receive a si del ink transmission from a transmitting wireless communication device. For example, the communication and processing circuitry 2142 and transceiver 2110, shown and described above in connection with FIG. 21, may provide a means to receive the sidelink transmission.

[0254] At block 2304, the receiving wireless communication device may receive preemption information associated with a portion of resources scheduled for the sidelink transmission that overlaps with an additional transmission from at least one of the transmitting wireless communication device or a network entity that scheduled the sidelink transmission. In some examples, the receiving wireless communication device may receive a preemption indication including the preemption information from the transmitting wireless communication device within a retransmission resource for the sidelink transmission, first stage sidelink control information, second stage sidelink control information, a sidelink medium access control (MAC) control element (MAC- CE), or a sidelink radio resource control (RRC) message. In some examples, the preemption information includes at least one of resource information identifying at least the portion of the resources, a symbol index offset for a demodulation reference signal, a delayed transmission indication, a puncturing pattern of the sidelink transmission, a rate matching pattern of the sidelink transmission, or a power control parameter. For example, the sidelink preemption circuitry 2146, together with the communication and processing circuitry 2142 and transceiver 2110, shown and described above in connection with FIG. 21 may provide a means to receive the preemption information.

[0255] At block 2306, the receiving wireless communication device may process the sidelink transmission based on the preemption information. For example, the sidelink preemption circuitry 2146, together with the communication and processing circuitry 2142, shown and described above in connection with FIG. 21 may provide a means to process the sidelink transmission based on the preemption information. [0256] In one configuration, the wireless communication device 2100 includes means for receiving a sidelink transmission from a transmitting wireless communication device, as described in the present disclosure. The wireless communication device 2100 further includes means for receiving preemption information associated with a portion of resources scheduled for the sidelink transmission that overlaps with an additional transmission from at least one of the transmitting wireless communication device or a network entity that scheduled the sidelink transmission and means for processing the sidelink transmission based on the preemption information. In one aspect, the aforementioned means may be the processor 2104 shown in FIG. 21 configured to perform the functions recited by the aforementioned means. In another aspect, the aforementioned means may be a circuit or any apparatus configured to perform the functions recited by the aforementioned means.

[0257] Of course, in the above examples, the circuitry included in the processor 2104 is merely provided as an example, and other means for carrying out the described functions may be included within various aspects of the present disclosure, including but not limited to the instructions stored in the computer-readable storage medium 2106, or any other suitable apparatus or means described in any one of the FIGs. 1, 3, 6, 7, and/or 13-15, and utilizing, for example, the processes and/or algorithms described herein in relation to FIG. 23.

[0258] FIG. 24 is a flow chart 2400 of another exemplary method for sidelink cancellation according to some aspects. As described below, some or all illustrated features may be omitted in a particular implementation within the scope of the present disclosure, and some illustrated features may not be required for implementation of all examples. In some examples, the method may be performed by the wireless communication device 2100, as described above and illustrated in FIG. 21, by a processor or processing system, or by any suitable means for carrying out the described functions.

[0259] At block 2402, the wireless communication device (e.g., a transmitting wireless communication device configured for sidelink communication) may receive sidelink scheduling information scheduling a sidelink transmission from the transmitting wireless communication device to a receiving wireless communication device from a network entity in the wireless communication network. The scheduling information can include scheduled resources for the sidelink transmission. In some examples, the sidelink scheduling information may be received within DCI 3_0. In some examples, the scheduled resources include time resources and frequency resources. For example, the communication and processing circuitry 2142 and transceiver 2110, shown and described above in connection with FIG. 21, may provide a means to receive the sidelink scheduling information.

[0260] At block 2404, the transmitting wireless communication device may receive control information from the network entity including a cancellation indication indicating at least overlapping resources between the scheduled resources and additional resources scheduled for an additional transmission. In some examples, the control information may include a DCI 2_4 format or a new DCI format. For example, the communication and processing circuitry 2142 and transceiver 2110, shown and described above in connection with FIG. 21, may provide a means to receive the control information including the cancellation indication.

[0261] At block 2406, the transmitting wireless communication device may cancel the sidelink transmission within cancelled resources including at least the overlapping resources. In some examples, the transmitting wireless communication device may cancel the sidelink transmission from a first symbol of the overlapping resources to a last symbol of the scheduled resources. In some examples, the transmitting wireless communication device may cancel the sidelink transmission within the cancelled resources including the overlapping resources and gap resources adjacent the overlapping resources to provide a gap between the overlapping resources utilized for the additional transmission and a second set of resources utilized for a second portion of the sidelink transmission in each of a time domain and a frequency domain.

[0262] In some examples, the cancelled resources include a cancelled portion of the time resources of the scheduled resources and a cancelled portion of the frequency resources within the cancelled portion of the time resources. In some examples, the cancelled portion of the frequency resources includes all of the frequency resources of the scheduled resources within the cancelled portion of the time resources. For example, the sidelink cancellation circuitry 2144 shown and described above in connection with FIG. 21 may cancel the sidelink transmission within the cancelled resources.

[0263] At block 2408, the transmitting wireless communication device may transmit the sidelink transmission to the receiving wireless communication device via remaining resources of the scheduled resources outside of the cancelled resources. In some examples, the transmitting wireless communication device may transmit the sidelink transmission to the receiving wireless communication device via the remaining resources in response to a percentage of the scheduled resources corresponding to the remaining resources being greater than a threshold.

[0264] In some examples, the transmitting wireless communication device may transmit a first portion of the sidelink transmission via a first set of resources of the scheduled resources and a second portion of the sidelink transmission via a second set of resources of the scheduled resources, where the first set of resources and the second set of resources are separated by the overlapping resources. In some examples, the transmitting wireless communication device may modify a rate-matching behavior of the sidelink transmission based on the cancellation indication. In some examples, the first portion of the sidelink transmission and the second portion of the sidelink transmission include different sets of coded bits corresponding to the sidelink transmission.

[0265] In some examples, the transmitting wireless communication device may maintain phase continuity between the first portion of the sidelink transmission and the second portion of the sidelink transmission based on the cancelled portion of the time resources. In some examples, the transmitting wireless communication device may transmit a reference signal within at least the second portion of the sidelink transmission. In some examples, the second portion of the sidelink transmission includes a part of the cancelled portion of the time resources and a part of the frequency resources outside of the cancelled portion of the frequency resources. In this example, the transmitting wireless communication device may transmit the reference signal across the second portion of the sidelink transmission in the time domain. In some examples, the transmitting wireless communication device may transmit the reference signal from a first symbol of the part of the cancelled portion of the time resources to a last symbol of the scheduled resources for the sidelink transmission.

[0266] In some examples, the reference signal includes a sidelink phase-tracking reference signal (PT-RS). In some examples, the first portion of the sidelink transmission includes a sidelink demodulation reference signal (DM-RS) and the sidelink PT-RS includes a repeated version of the sidelink demodulation reference signal (DM-RS). In some examples, the transmitting wireless communication device may receive a radio resource control (RRC) configuration of the sidelink DM-RS from the network entity. In some examples, the second portion of the sidelink transmission comprises a sidelink DM- RS. In this example, the transmitting wireless communication device may transmit the sidelink PT-RS across one or more symbols of the second portion of the sidelink transmission that are devoid of the sidelink DM-RS. In some examples, the transmitting wireless communication device may transmit a first reference signal in a first symbol of the second portion of the sidelink transmission for automatic gain control training and transmit a second reference signal across one or more remaining symbols of the second portion of the sidelink transmission. In some examples, the transmitting wireless communication device may transmit the reference signal across all of the time resources of the sidelink transmission. For example, the sidelink cancellation circuitry 2144, together with the communication and processing circuitry 2142 and transceiver 2110, shown and described above in connection with FIG. 21 may transmit the sidelink transmission via the remaining resources.

[0267] In one configuration, the wireless communication device 2100 includes means for receiving sidelink scheduling information scheduling a sidelink transmission from the transmitting wireless communication device to a receiving wireless communication device from a network entity in the wireless communication network, wherein the scheduling information comprises scheduled resources for the sidelink transmission, as described in the present disclosure. The wireless communication device 2100 further includes means for receiving control information from the network entity, the control information comprising a cancellation indication indicating at least overlapping resources between the scheduled resources and additional resources scheduled for an additional transmission, means for cancelling the sidelink transmission within cancelled resources comprising at least the overlapping resources, and means for transmitting the sidelink transmission to the receiving wireless communication device via remaining resources of the scheduled resources outside of the cancelled resources. In one aspect, the aforementioned means may be the processor 2104 shown in FIG. 21 configured to perform the functions recited by the aforementioned means. In another aspect, the aforementioned means may be a circuit or any apparatus configured to perform the functions recited by the aforementioned means.

[0268] Of course, in the above examples, the circuitry included in the processor 2104 is merely provided as an example, and other means for carrying out the described functions may be included within various aspects of the present disclosure, including but not limited to the instructions stored in the computer-readable storage medium 2106, or any other suitable apparatus or means described in any one of the FIGs. 1, 3, 6, 7, and/or 13-15, and utilizing, for example, the processes and/or algorithms described herein in relation to FIG. 24. [0269] FIG. 25 is a flow chart 2500 of an exemplary method for sidelink prioritization according to some aspects. As described below, some or all illustrated features may be omitted in a particular implementation within the scope of the present disclosure, and some illustrated features may not be required for implementation of all examples. In some examples, the method may be performed by the wireless communication device 2100, as described above and illustrated in FIG. 21, by a processor or processing system, or by any suitable means for carrying out the described functions.

[0270] At block 2502, the wireless communication device (e.g., a transmitting wireless communication device configured for sidelink communication) may receive sidelink scheduling information scheduling a sidelink transmission from the transmitting wireless communication device to a receiving wireless communication device from a network entity in the wireless communication network. The scheduling information can include at least a priority indicator for the sidelink transmission. In some examples, the priority indicator includes a single bit priority indicator. In some examples, the priority indicator includes a multi-bit priority indicator. In some examples, the scheduling information further includes a power control parameter associated with the priority indicator. In some examples, the scheduling information includes downlink control information (DCI) format 3_0. In some examples, the transmitting wireless communication device may further transmit a scheduling request to the network entity for the sidelink transmission. The scheduling request can include the priority indicator. For example, the communication and processing circuitry 2142 and transceiver 2110, shown and described above in connection with FIG. 21, may provide a means to receive the sidelink scheduling information.

[0271] At block 2504, the transmitting wireless communication device may transmit the sidelink transmission to the receiving wireless communication device based on the scheduling information. In some examples, the transmitting wireless communication device may transmit the priority indicator for the sidelink transmission to the receiving wireless communication device. In some examples, the transmitting wireless communication device may transmit the sidelink transmission at a transmission power based on the power control parameter. For example, the communication and processing circuitry 2142 and transceiver 2110, shown and described above in connection with FIG. 21, may provide a means to transmit the sidelink transmission.

[0272] At block 2506, the transmitting wireless communication device may further optionally receive sidelink acknowledgement information of the sidelink transmission from the receiving wireless communication device encoded based on a sidelink hybrid automatic repeat request (HARQ) codebook associated with the priority indicator. For example, the sidelink HARQ circuitry 2148, together with the communication and processing circuitry 2142 and transceiver 2110, shown and described above in connection with FIG. 21, may provide a means to receive the sidelink acknowledgement information.

[0273] At block 2508, the transmitting wireless communication device may further optionally select an uplink hybrid automatic repeat request (HARQ) codebook for uplink acknowledgement information corresponding to the sidelink acknowledgement information based on the priority indicator. For example, the sidelink HARQ circuitry 2148 shown and described above in connection with FIG. 21, may provide a means to select the uplink HARQ codebook.

[0274] At block 2510, the transmitting wireless communication device may further optionally transmit the uplink acknowledgement information to the network entity based on the selected uplink HARQ codebook. For example, the sidelink HARQ circuitry 2148, together with the communication and processing circuitry 2142 and transceiver 2110, shown and described above in connection with FIG. 21, may provide a means to transmit the uplink acknowledgement information.

[0275] In one configuration, the wireless communication device 2100 includes means for receiving sidelink scheduling information scheduling a sidelink transmission from the transmitting wireless communication device to a receiving wireless communication device from a network entity in the wireless communication network, wherein the scheduling information comprises at least a priority indicator for the sidelink transmission, as described in the present disclosure. The wireless communication device 2100 further includes means for transmitting the sidelink transmission to the receiving wireless communication device based on the scheduling information. In one aspect, the aforementioned means may be the processor 2104 shown in FIG. 21 configured to perform the functions recited by the aforementioned means. In another aspect, the aforementioned means may be a circuit or any apparatus configured to perform the functions recited by the aforementioned means.

[0276] Of course, in the above examples, the circuitry included in the processor 2104 is merely provided as an example, and other means for carrying out the described functions may be included within various aspects of the present disclosure, including but not limited to the instructions stored in the computer-readable storage medium 2106, or any other suitable apparatus or means described in any one of the FIGs. 1, 3, 6, 7, and/or 13-15, and utilizing, for example, the processes and/or algorithms described herein in relation to FIG. 25.

[0277] FIG. 26 is a conceptual diagram illustrating an example of a hardware implementation for an exemplary network entity 2600 employing a processing system 2614. For example, the network entity 2600 may correspond to any of the base stations (e.g., gNBs) or scheduling entities shown in any one or more of FIGs. 1, 3, 6, 7 and/or 13-15.

[0278] In accordance with various aspects of the disclosure, an element, or any portion of an element, or any combination of elements may be implemented with a processing system 2614 that includes one or more processors 2604. The processing system 2614 may be substantially the same as the processing system 2114 illustrated in FIG. 21, including a bus interface 2608, a bus 2602, memory 2605, a processor 2604, and a computer- readable medium 2606. Furthermore, the network entity 2600 may include an optional user interface 2612 and a transceiver 2610. The processor 2604, as utilized in a network entity 2600, may be used to implement any one or more of the processes described below.

[0279] The processor 2604 may include resource assignment and scheduling circuitry 2642, configured to generate, schedule, and modify a resource assignment or grant of time-frequency resources (e.g., a set of one or more resource elements). For example, the resource assignment and scheduling circuitry 2642 may be configured to allocate/schedule resources for a sidelink transmission from a transmitting wireless communication device to a receiving wireless communication device. The resource assignment and scheduling circuitry 2642 may further schedule resources for an additional transmission (e.g., an uplink transmission, such as a PUSCFi or SRS, or an additional sidelink transmission). In some examples, at least a portion of the resources allocated to the sidelink transmission may overlap with the resources scheduled for the additional transmission. The resource assignment and scheduling circuitry 2642 may further schedule control information including a cancellation indication indicating an overlap between the portion of the resources allocated to the sidelink transmission and the additional transmission. In addition, the resource assignment and scheduling circuitry 2642 may further schedule resources for the transmission of a preemption indication from the transmitting wireless communication device to the receiving wireless communication device. The resource assignment and scheduling circuitry 2642 may further be configured to execute resource assignment and scheduling instructions (software) 2652 stored in the computer-readable medium 2606 to implement one or more of the functions described herein.

[0280] The processor 2604 may further include communication and processing circuitry 2644 configured to communicate with at least the transmitting wireless communication device via a Uu link. The communication and processing circuitry 2644 may further be configured to communicate with the receiving wireless communication device via a Uu link. In some examples, the communication and processing circuitry 2644 may include one or more hardware components that provide the physical structure that performs processes related to wireless communication (e.g., signal reception and/or signal transmission) and signal processing (e.g., processing a received signal and/or processing a signal for transmission). For example, the communication and processing circuitry 2644 may include one or more transmit/receive chains.

[0281] In some implementations where the communication involves receiving information, the communication and processing circuitry 2644 may obtain information from a component of the network entity 2600 (e.g., from the transceiver 2610 that receives the information via radio frequency signaling or some other type of signaling suitable for the applicable communication medium), process (e.g., decode) the information, and output the processed information. For example, the communication and processing circuitry 2644 may output the information to another component of the processor 2604, to the memory 2605, or to the bus interface 2608. In some examples, the communication and processing circuitry 2644 may receive one or more of signals, messages, other information, or any combination thereof. In some examples, the communication and processing circuitry 2644 may receive information via one or more channels. In some examples, the communication and processing circuitry 2644 may include functionality for a means for receiving. In some examples, the communication and processing circuitry 2644 may include functionality for a means for processing, including a means for demodulating, a means for decoding, etc.

[0282] In some implementations where the communication involves sending (e.g., transmitting) information, the communication and processing circuitry 2644 may obtain information (e.g., from another component of the processor 2604, the memory 2605, or the bus interface 2608), process (e.g., modulate, encode, etc.) the information, and output the processed information. For example, the communication and processing circuitry 2644 may output the information to the transceiver 2610 (e.g., that transmits the information via radio frequency signaling or some other type of signaling suitable for the applicable communication medium). In some examples, the communication and processing circuitry 2644 may send one or more of signals, messages, other information, or any combination thereof. In some examples, the communication and processing circuitry 2644 may send information via one or more channels. In some examples, the communication and processing circuitry 2644 may include functionality for a means for sending (e.g., a means for transmitting). In some examples, the communication and processing circuitry 2644 may include functionality for a means for generating, including a means for modulating, a means for encoding, etc.

[0283] The communication and processing circuitry 2644 may be configured to transmit sidelink scheduling information scheduling a sidelink transmission from a transmitting wireless communication device to a receiving wireless communication device to at least the transmitting wireless communication device. The scheduling information may include, for example, scheduled resources for the sidelink transmission and/or a cast type (e.g., unicast, groupcast, or broadcast) of the sidelink transmission. The sidelink scheduling information may be transmitted, for example, via downlink control information (DCI) format 3_0.

[0284] In some examples, the DCI 3_0 can include a priority indicator for the sidelink transmission. The priority indicator may be one of two or more priority indicators 2618 that may be associated with sidelink transmissions. The priority indicators 2618 may be maintained, for example, in memory 2605. For example, the priority indicator may include a single bit priority indicator or a multi-bit priority indicator. In some examples, the scheduling information may further include a power control parameter associated with the priority indicator. In some examples, the communication and processing circuitry 2644 may further be configured to receive a scheduling request 2616 including the priority indicator for the sidelink transmission from the transmitting wireless communication device. In some examples, the communication and processing circuitry 2644 may store the scheduling request 2616 within, for example, memory 2605 for processing by the resource assignment and scheduling circuitry 2642 to schedule the resources for the requested sidelink transmission and select the requested priority indicator 2618 for the sidelink transmission.

[0285] The communication and processing circuitry 2644 may further be configured to transmit control information including a cancellation indication to at least the transmitting wireless communication device. For example, the communication and processing circuitry 2644 may transmit the control information to only the transmitting wireless communication device or to both the transmitting wireless communication device and the receiving wireless communication device. In some examples, the communication and processing circuitry 2644 may transmit separate control information including the cancellation indication to the receiving wireless communication device. In some examples, each control information may include DCI format 2_4 or a new DCI format.

[0286] In some examples, the cancellation indication may indicate preemption information utilized by the receiving wireless communication device in processing the sidelink transmission. For example, the preemption information may include at least one of resource information identifying overlapping resources between the sidelink transmission and the additional transmission, a symbol index offset for a demodulation reference signal, a delayed transmission indication, a puncturing pattern of the sidelink transmission, a rate matching pattern of the sidelink transmission, or a power control parameter.

[0287] In some examples, the cancellation indication may indicate at least an overlap between a portion of the resources allocated to the sidelink transmission and an additional transmission. Thus, the cancellation indication may indicate at least overlapping resources between the scheduled resources for the sidelink transmission and additional resources scheduled for the additional transmission. For example, the cancellation indication may include resource information identifying at least the portion of the resources (e.g., the overlapping resources). In some examples, the resource information may include a plurality of bits, each corresponding to a resource block group of a plurality of resource block groups and a symbol of a plurality of symbols. In some examples, each bit maps to either an uplink symbol or a flexible symbol. In other examples, each bit maps to only an uplink symbol.

[0288] In some examples, the control information may further include cancellation behavior information associated with the cancellation indication that indicates at least one modification of the sidelink transmission. For example, the cancellation behavior information may include one or more of a priority indicator of the additional transmission, a cast type of the additional transmission, a cancellation type (e.g., a hard cancellation indicator or a soft cancellation indicator), or a power control parameter. The cancellation behavior information may further include other cancellation behavior, such as the cancellation behavior indicated by the preemption information.

[0289] In some examples, the control information may further include preemption scheduling information for the preemption indication to be transmitted from the transmitting wireless communication device to the receiving wireless communication device. In some examples, the preemption scheduling information may schedule transmission of the preemption indication within a retransmission resource for the sidelink transmission, first stage sidelink control information, second stage si del ink control information, a sidelink medium access control (MAC) control element (MAC- CE), or a sidelink radio resource control (RRC) message.

[0290] The communication and processing circuitry 2644 may further be configured to transmit a cancellation application indicator indicating whether the cancellation indication is applicable to one or more of uplink transmissions or sidelink transmissions to at least the transmitting wireless communication device. For example, the communication and processing circuitry 2644 may be configured to transmit the cancellation application indicator as a dedicated field within the control information, as a dedicated format of the control information, via radio resource control (RRC) signaling, as a cancellation indicator radio network temporary identifier (CI-RNTI) utilized to scramble a cyclic redundancy check (CRC) of the control information, or as a search space configuration associated with the control information. In some examples, the cancellation application indicator may indicate that the cancellation indication is a sidelink cancellation indication applicable to a sidelink transmission scheduled on the overlapping resources. In other examples, the cancellation application indicator may indicate that the cancellation indication is applicable to both a sidelink transmission and an uplink transmission, each scheduled on the overlapping resources.

[0291] In some examples, the communication and processing circuitry 2644 may be configured to transmit additional scheduling information for an additional sidelink transmission to the transmitting wireless communication device via, for example, DCI 3_0. In this example, the additional scheduling information may correspond to the cancellation indication indicating the overlap between the portion of the resources allocated to the sidelink transmission and the additional sidelink transmission. The communication and processing circuitry 2644 may further be configured to execute communication and processing instructions (software) 2654 stored in the computer- readable medium 2606 to implement one or more of the functions described herein.

[0292] The processor 2604 may further include sidelink cancellation circuitry 2646, configured to generate the control information including the cancellation indication. In some examples, the sidelink cancellation circuitry 2646 may further be configured to generate the resource information identifying at least the portion of the resources allocated to the sidelink transmission and to include the resource information in the control information. In addition, the sidelink cancellation circuitry 2646 may further be configured to generate cancellation behavior associated with the cancellation indication and to transmit the cancellation behavior in the control information (e.g., as the cancellation behavior information) and/or via RRC signaling to at least the transmitting wireless communication device. The sidelink cancellation circuitry 2646 may further be configured to execute sidelink cancellation instructions (software) 2656 stored in the computer-readable medium 2606 to implement one or more of the functions described herein.

[0293] The processor 2604 may further include HARQ circuitry 2648, configured to receive acknowledgement information of the sidelink transmission from the transmitting device based on the priority indicator. The acknowledgement information may correspond to sidelink acknowledgement information received by the transmitting wireless communication device from the receiving wireless communication device. In some examples, the acknowledgement information may be encoded based on one of two or more HARQ codebooks (CBs) 2620, each associated with a respective priority indicator of a sidelink transmission. In this example, the HARQ circuitry 2648 may decode the acknowledgement information based on the HARQ CB 2620 associated with the priority indicator included in the scheduling information for the sidelink transmission. The HARQ circuitry 2648 may further be configured to execute HARQ instructions (software) 2658 stored in the computer-readable medium 2606 to implement one or more of the functions described herein.

[0294] FIG. 27 is a flow chart 2700 of an exemplary method for sidelink cancellation according to some aspects. As described below, some or all illustrated features may be omitted in a particular implementation within the scope of the present disclosure, and some illustrated features may not be required for implementation of all examples. In some examples, the method may be performed by the network entity 2600, as described above and illustrated in FIG. 26, by a processor or processing system, or by any suitable means for carrying out the described functions.

[0295] At block 2702, the network entity may transmit sidelink scheduling information scheduling a sidelink transmission from a transmitting wireless communication device to a receiving wireless communication device. The scheduling information can include resources allocated to the sidelink transmission. In some examples, the sidelink scheduling information may be transmitted within DCI 3_0. In some examples, the scheduling information further includes a priority indicator indicating a priority of the sidelink transmission and/or a cast type (e.g., unicast, groupcast, or broadcast) of the sidelink transmission. For example, the communication and processing circuitry 2644 and transceiver 2610, shown and described above in connection with FIG. 26, may provide a means to transmit the sidelink scheduling information.

[0296] At block 2704, the network entity may transmit control information to at least the transmitting wireless communication device including a cancellation indication indicating an overlap between at least a portion of the resources allocated to the sidelink transmission and an additional transmission. In some examples, the control information comprises downlink control information (DCI) format 2_4 or a new DCI format. In some examples, the control information includes resource information identifying at least the portion of the resources allocated to the sidelink transmission. The resource information can include a plurality of bits, each corresponding to a resource block group of a plurality of resource block groups and symbol of a plurality of symbols. In some examples, the control information further includes cancellation behavior information associated with the cancellation indication. The cancellation behavior information can indicate at least one modification of the sidelink transmission. In some examples, the network entity may further transmit a cancellation application indicator indicating whether the cancellation indication is applicable to one or more of uplink transmissions or sidelink transmissions. For example, the sidelink cancellation circuitry 2646, together with the communication and processing circuitry 2644 and transceiver 2610, shown and described above in connection with FIG. 26, may provide a means to transmit the control information including the cancellation indication.

[0297] In one configuration, the network entity includes means for transmitting sidelink scheduling information scheduling a sidelink transmission from a transmitting wireless communication device to a receiving wireless communication device, wherein the scheduling information comprises resources allocated to the sidelink transmission. The network entity further includes means for transmitting control information to at least the transmitting wireless communication device, the control information comprising a cancellation indication indicating at least an overlap between a portion of the resources allocated to the sidelink transmission and an additional transmission. In one aspect, the aforementioned means may be the processor 2604 shown in FIG. 26 configured to perform the functions recited by the aforementioned means. In another aspect, the aforementioned means may be a circuit or any apparatus configured to perform the functions recited by the aforementioned means.

[0298] Of course, in the above examples, the circuitry included in the processor 2604 is merely provided as an example, and other means for carrying out the described functions may be included within various aspects of the present disclosure, including but not limited to the instructions stored in the computer-readable storage medium 2606, or any other suitable apparatus or means described in any one of the FIGs. 1, 3, 6, 7, and/or 13-15, and utilizing, for example, the processes and/or algorithms described herein in relation to FIG. 27.

[0299] FIG. 28 is a flow chart 2800 of an exemplary method for sidelink prioritization according to some aspects. As described below, some or all illustrated features may be omitted in a particular implementation within the scope of the present disclosure, and some illustrated features may not be required for implementation of all examples. In some examples, the method may be performed by the network entity 2600, as described above and illustrated in FIG. 26, by a processor or processing system, or by any suitable means for carrying out the described functions.

[0300] At block 2802, the network entity may transmit sidelink scheduling information scheduling a sidelink transmission from a transmitting wireless communication device to a receiving wireless communication device. The scheduling information can include at least a priority indicator for the sidelink transmission. In some examples, the priority indicator includes a single bit priority indicator. In some examples, the priority indicator includes a multi-bit priority indicator. In some examples, the scheduling information further includes a power control parameter associated with the priority indicator that indicates a transmission power of the sidelink transmission. In some examples, the scheduling information includes downlink control information (DCI) format 3_0. In some examples, the network entity may further receive a scheduling request from the transmitting wireless communication device for the sidelink transmission. The scheduling request can include the priority indicator. For example, the communication and processing circuitry 2644 and transceiver 2610, shown and described above in connection with FIG. 26, may provide a means to transmit the sidelink scheduling information.

[0301] At block 2804, the network entity may receive acknowledgement information of the sidelink transmission from the transmitting device based on the priority indicator. The acknowledgement information can correspond to sidelink acknowledgement information received by the transmitting wireless communication device from the receiving wireless communication device. In some examples, the acknowledgement information is encoded based on a hybrid automatic repeat request (HARQ) codebook associated with the priority indicator. For example, the HARQ circuitry 2648, together with the communication and processing circuitry 2644 and transceiver 2610, shown and described above in connection with FIG. 26 may provide a means to receive the acknowledgement information.

[0302] In one configuration, the network entity includes means for transmitting si del ink scheduling information scheduling a sidelink transmission from a transmitting wireless communication device to a receiving wireless communication device, wherein the scheduling information comprises at least a priority indicator for the sidelink transmission. The network entity further includes means for receiving acknowledgement information of the sidelink transmission from the transmitting device based on the priority indicator, the acknowledgement information corresponding to sidelink acknowledgement information received by the transmitting wireless communication device from the receiving wireless communication device. In one aspect, the aforementioned means may be the processor 2604 shown in FIG. 26 configured to perform the functions recited by the aforementioned means. In another aspect, the aforementioned means may be a circuit or any apparatus configured to perform the functions recited by the aforementioned means.

[0303] Of course, in the above examples, the circuitry included in the processor 2604 is merely provided as an example, and other means for carrying out the described functions may be included within various aspects of the present disclosure, including but not limited to the instructions stored in the computer-readable storage medium 2606, or any other suitable apparatus or means described in any one of the FIGs. 1, 3, 6, 7, and/or 13-15, and utilizing, for example, the processes and/or algorithms described herein in relation to FIG. 28.

[0304] The processes shown in FIGs. 22-25, 27, and 28 may include additional aspects, such as any single aspect or any combination of aspects described below and/or in connection with one or more other processes described elsewhere herein.

[0305] Aspect 1: A method for wireless communication at a transmitting wireless communication device in a wireless communication network, the method comprising: receiving sidelink scheduling information scheduling a sidelink transmission from the transmitting wireless communication device to a receiving wireless communication device from a network entity in the wireless communication network, wherein the scheduling information comprises scheduled resources for the sidelink transmission; receiving control information from the network entity, the control information comprising a cancellation indication indicating at least overlapping resources between the scheduled resources and additional resources scheduled for an additional transmission; cancelling the sidelink transmission within cancelled resources comprising at least the overlapping resources; and transmitting the sidelink transmission to the receiving wireless communication device via remaining resources of the scheduled resources outside of the cancelled resources.

[0306] Aspect 2: The method of aspect 1 , wherein the cancelling the sidelink transmission further comprises: cancelling the sidelink transmission from a first symbol of the overlapping resources to a last symbol of the scheduled resources.

[0307] Aspect 3: The method of aspect 1, wherein the transmitting the sidelink transmission further comprises: transmitting a first portion of the sidelink transmission via a first set of resources of the scheduled resources and a second portion of the sidelink transmission via a second set of resources of the scheduled resources, wherein the first set of resources and the second set of resources are separated by the overlapping resources.

[0308] Aspect 4: The method of aspect 3, wherein the cancelling the sidelink transmission further comprises: cancelling the sidelink transmission within the cancelled resources comprising the overlapping resources and gap resources adjacent the overlapping resources to provide a gap between the overlapping resources utilized for the additional transmission and the second set of resources utilized for the second portion of the sidelink transmission in each of a time domain and a frequency domain.

[0309] Aspect 5: The method of aspect 4, further comprising: modifying a rate-matching behavior of the sidelink transmission based on the cancellation indication.

[0310] Aspect 6: The method of aspect 4 or 5, wherein the scheduled resources comprise time resources and frequency resources, and wherein the cancelled resources comprise a cancelled portion of the time resources of the scheduled resources, and a cancelled portion of the frequency resources within the cancelled portion of the time resources.

[0311] Aspect 7: The method of aspect 6, wherein the cancelled portion of the frequency resources further comprises all of the frequency resources of the scheduled resources within the cancelled portion of the time resources.

[0312] Aspect 8: The method of aspect 7, wherein the first portion of the sidelink transmission and the second portion of the sidelink transmission comprise different sets of coded bits corresponding to the sidelink transmission. [0313] Aspect 9: The method of aspect 7 or 8, further comprising: maintaining phase continuity between the first portion of the sidelink transmission and the second portion of the sidelink transmission based on the cancelled portion of the time resources.

[0314] Aspect 10: The method of any of aspects 6 through 8, further comprising: transmitting a reference signal within at least the second portion of the sidelink transmission.

[0315] Aspect 11: The method of aspect 10, wherein the second portion of the sidelink transmission comprises a part of the cancelled portion of the time resources and a part of the frequency resources outside of the cancelled portion of the frequency resources, and wherein the transmitting the sidelink transmission further comprises: transmitting the reference signal across the second portion of the sidelink transmission in the time domain.

[0316] Aspect 12: The method of aspect 11, wherein the transmitting the reference signal further comprises: transmitting the reference signal from a first symbol of the part of the cancelled portion of the time resources to a last symbol of the scheduled resources for the sidelink transmission.

[0317] Aspect 13: The method of aspect 11, wherein the reference signal comprises a sidelink phase-tracking reference signal (PT-RS).

[0318] Aspect 14: The method of aspect 13, wherein the first portion of the sidelink transmission comprises a sidelink demodulation reference signal (DM-RS) and the sidelink PT-RS comprises a repeated version of the sidelink demodulation reference signal (DM-RS).

[0319] Aspect 15: The method of aspect 13, wherein the PT-RS comprises a sidelink DM- RS, and further comprising: receiving a radio resource control (RRC) configuration of the sidelink DM-RS from the network entity.

[0320] Aspect 16: The method of aspect 13, wherein the second portion of the sidelink transmission comprises a sidelink DM-RS, and wherein the transmitting the reference signal further comprises: transmit the sidelink PT-RS across one or more symbols of the second portion of the sidelink transmission that are devoid of the sidelink DM-RS.

[0321] Aspect 17: The method of any of aspects 10 through 16, wherein the second portion of the sidelink transmission comprises a sidelink DM-RS, and wherein the transmitting the reference signal further comprises: transmitting a first reference signal in a first symbol of the second portion of the sidelink transmission for automatic gain control training; and transmitting a second reference signal across one or more remaining symbols of the second portion of the sidelink transmission. [0322] Aspect 18: The method of any of aspects 10 through 16, wherein the transmitting the reference signal further comprises: transmitting the reference signal across all of the time resources of the sidelink transmission.

[0323] Aspect 19: The method of any of aspects 1 through 17, wherein the transmitting the sidelink transmission further comprises: transmitting the sidelink transmission to the receiving wireless communication device via the remaining resources in response to a percentage of the scheduled resources corresponding to the remaining resources being greater than a threshold.

[0324] Aspect 20: An apparatus in a wireless communication network comprising a transceiver, a memory, and a processor coupled to the transceiver and the memory, the processor and the memory configured to perform a method of any one of examples 1 through 19.

[0325] Aspect 21: An apparatus configured for wireless communication comprising means for performing a method of any one of examples 1 through 19.

[0326] Aspect 22: An article of manufacture comprising a non-transitory computer- readable medium having stored therein instructions executable by one or more processors of a wireless communication device in a wireless communication network to perform a method of any one of examples 1 through 19.

[0327] Several aspects of a wireless communication network have been presented with reference to an exemplary implementation. As those skilled in the art will readily appreciate, various aspects described throughout this disclosure may be extended to other telecommunication systems, network architectures and communication standards.

[0328] By way of example, various aspects may be implemented within other systems defined by 3GPP, such as Long-Term Evolution (LTE), the Evolved Packet System (EPS), the Universal Mobile Telecommunication System (UMTS), and/or the Global System for Mobile (GSM). Various aspects may also be extended to systems defined by the 3rd Generation Partnership Project 2 (3GPP2), such as CDMA2000 and/or Evolution- Data Optimized (EV-DO). Other examples may be implemented within systems employing IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Ultra- Wideband (UWB), Bluetooth, and/or other suitable systems. The actual telecommunication standard, network architecture, and/or communication standard employed will depend on the specific application and the overall design constraints imposed on the system.

[0329] Within the present disclosure, the word “exemplary” is used to mean “serving as an example, instance, or illustration.” Any implementation or aspect described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other aspects of the disclosure. Likewise, the term “aspects” does not require that all aspects of the disclosure include the discussed feature, advantage or mode of operation. The term “coupled” is used herein to refer to the direct or indirect coupling between two objects. For example, if object A physically touches object B, and object B touches object C, then objects A and C may still be considered coupled to one another — even if they do not directly physically touch each other. For instance, a first object may be coupled to a second object even though the first object is never directly physically in contact with the second object. The terms “circuit” and “circuitry” are used broadly, and intended to include both hardware implementations of electrical devices and conductors that, when connected and configured, enable the performance of the functions described in the present disclosure, without limitation as to the type of electronic circuits, as well as software implementations of information and instructions that, when executed by a processor, enable the performance of the functions described in the present disclosure.

[0330] One or more of the components, steps, features and/or functions illustrated in

FIGs. 1-28 may be rearranged and/or combined into a single component, step, feature or function or embodied in several components, steps, or functions. Additional elements, components, steps, and/or functions may also be added without departing from novel features disclosed herein. The apparatus, devices, and/or components illustrated in FIGs. 1, 3, 6, 7, 13-15, 21, and/or 26 may be configured to perform one or more of the methods, features, or steps described herein. The novel algorithms described herein may also be efficiently implemented in software and/or embedded in hardware.

[0331] It is to be understood that the specific order or hierarchy of steps in the methods disclosed is an illustration of exemplary processes. Based upon design preferences, it is understood that the specific order or hierarchy of steps in the methods may be rearranged. The accompanying method claims present elements of the various steps in a sample order and are not meant to be limited to the specific order or hierarchy presented unless specifically recited therein.

[0332] The previous description is provided to enable any person skilled in the art to practice the various aspects described herein. Various modifications to these aspects will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other aspects. Thus, the claims are not intended to be limited to the aspects shown herein, but are to be accorded the full scope consistent with the language of the claims, wherein reference to an element in the singular is not intended to mean “one and only one” unless specifically so stated, but rather “one or more.” Unless specifically stated otherwise, the term “some” refers to one or more. A phrase referring to “at least one of’ a list of items refers to any combination of those items, including single members. As an example, “at least one of: a, b, or c” is intended to cover: a; b; c; a and b; a and c; b and c; and a, b, and c. All structural and functional equivalents to the elements of the various aspects described throughout this disclosure that are known or later come to be known to those of ordinary skill in the art are expressly incorporated herein by reference and are intended to be encompassed by the claims. Moreover, nothing disclosed herein is intended to be dedicated to the public regardless of whether such disclosure is explicitly recited in the cl aims.