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Title:
BASE STATION CONTENTION WINDOW UPDATE WITH AUL IN TXOP
Document Type and Number:
WIPO Patent Application WO/2019/161160
Kind Code:
A1
Abstract:
Base station contention window update procedures with autonomous uplink (AUL) in a transmission opportunity (TxOP) is discussed. After acquiring a channel and scheduling the TxOP, a base station may transmit control signals to manage communications with served user equipments (UEs). Management of AUL communications in addition to update of the contention window may be determined based on whether the base station has either or both downlink data and scheduled uplink (SUL) transmissions scheduled for the TxOP. Where both downlink and SUL are scheduled, AUL transmissions are allowed, but update of the contention window uses feedback based on the downlink transmissions. Where SUL are scheduled, but no downlink data, AUL are allowed and the contention window is updated using performance information on the uplink transmissions. Finally, where neither data nor SU L are scheduled, the base station deactivate any AUL resources for the TxOP and will refrain from updating the contention window.

Inventors:
TIAN, Qingjiang (QUALCOMM Incorporated, ATTN: International IP Administration5775 Morehouse Driv, San Diego California, 92121-1714, US)
YERRAMALLI, Srinivas (QUALCOMM Incorporated, ATTN: International IP Administration5775 Morehouse Driv, San Diego California, 92121-1714, US)
SUN, Jing (QUALCOMM Incorporated, ATTN: International IP Administration5775 Morehouse Driv, San Diego California, 92121-1714, US)
ZHANG, Xiaoxia (QUALCOMM Incorporated, ATTN: International IP Administration5775 Morehouse Driv, San Diego California, 92121-1714, US)
LIU, Chih-Hao (QUALCOMM Incorporated, ATTN: International IP Administration5775 Morehouse Driv, San Diego California, 92121-1714, US)
Application Number:
US2019/018155
Publication Date:
August 22, 2019
Filing Date:
February 15, 2019
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
QUALCOMM INCORPORATED (ATTN: International IP Administration, 5775 Morehouse DriveSan Diego, California, 92121-1714, US)
International Classes:
H04L5/00; H04W56/00; H04W74/08
Domestic Patent References:
WO2017165405A22017-09-28
WO2017171603A12017-10-05
WO2017171604A12017-10-05
Other References:
INTEL CORPORATION: "A framework to enable autonomous uplink access", vol. RAN WG1, no. Prague, P.R. Czechia; 20170821 - 20170825, 20 August 2017 (2017-08-20), XP051315294, Retrieved from the Internet [retrieved on 20170820]
None
Attorney, Agent or Firm:
MEANEY, Thomas J. (Norton Rose Fulbright US LLP, 2200 Ross Ave.Suite 360, Dallas Texas, 75201-7932, US)
Download PDF:
Claims:
CLAIMS

1. A method of wireless communication, comprising:

acquiring, by a base station, a transmission opportunity (TxOP) in a shared communication channel;

transmitting, by the base station, control signals within the TxOP;

determining, by the base station, whether downlink data and scheduled uplink (SUL) data are scheduled for transmission within the TxOP;

in response to detenriination that the downlink data is not scheduled and the SUL data is scheduled within the TxOP,

detecting, by the base station, one or more autonomous uplink (AUL) transmissions within the TxOP; and

updating, by the base station, a contention window size based on a successful reception rate of the SUL data and the one or more AUL transmissions;

in response to determination that the downlink data is scheduled within the TxOP, updating, by the base station, the contention window size based on reception feedback associated with downlink data received from one or more served UEs; and

in response to deterrnination that the downlink data and the SUL data are not scheduled in the TxOP,

signaling, by the base station, a deactivation indicator of all AUL resources allocated for the TxOP, wherein the deactivation indicator is signaled in the control signals; and

refraining, by the base station, from updating the contention window size.

2. A method of wireless communication, including:

acquiring, by a base station, a transmission opportunity (TxOP) in a shared communication channel;

determining, by the base station, whether scheduled uplink (SUL) transmissions are scheduled within one or more uplink slots of the TxOP; and

transmitting, by the base station, dynamic control information identifying an autonomous uplink (AUL) transmission starting offset behavior, wherein the dynamic control information is based on the determining.

3. The method of claim 2, wherein the transmitting includes one of: transmitting the dynamic control information identifying earlier AUL transmission starting offsets in response to indication of no SUL transmissions scheduled in an uplink subframe within the TxOP; or

transmitting the dynamic control information identifying later AUL transmission starting offsets in response to indication of SUL transmissions scheduled in an uplink subframe within the TxOP.

4. The method of claim 2, wherein the dynamic control information includes a bitmap identifying determination of the SUL transmission scheduling for each uplink slot of the TxOP.

5. The method of claim 2, wherein the dynamic control information includes a field indicating one or more sets of AUL transmission starting offset behaviors for the TxOP, wherein the one or more sets of AUL transmission starting offset behaviors includes at least one or more of:

all uplink slots of the TxOP having the SUL transmissions scheduled;

no uplink slots of the TxOP having the SUL transmissions scheduled; and

one or more groups of uplink slots out of all uplink slots of the TxOP having the SUL transmissions scheduled.

6. The method of claim 2, wherein the AUL transmission starting offset behavior includes a different AUL transmission starting offset for each of a plurality of AUL user equipments (UEs) for one or more AUL slots within the TxOP.

7. An apparatus configured for wireless communication, the apparatus comprising:

at least one processor; and

a memory coupled to the at least one processor,

wherein the at least one processor is configured:

to acquire, by a base station, a transmission opportunity (TxOP) in a shared communication channel;

to transmit, by the base station, control signals within the TxOP; to determine, by the base station, whether downlink data and scheduled uplink (SUL) data are scheduled for transmission within the TxOP;

in response to determination that the downlink data is not scheduled and the SUL data is scheduled within the TxOP, the at least one processor is further configured:

to detect, by the base station, one or more autonomous uplink (AUL) transmissions within the TxOP; and

to update, by the base station, a contention window size based on a successful reception rate of the SUL data and the one or more AUL transmissions;

in response to detennination that the downlink data is scheduled within the TxOP, the at least one processor is further configured:

to update, by the base station, the contention window size based on reception feedback associated with downlink data received from one or more served UEs; and

in response to determination that the downlink data and the SUL data are not scheduled in the TxOP, the at least one processor is further configured:

to signal, by the base station, a deactivation indicator of all AUL resources allocated for the TxOP, wherein the deactivation indicator is signaled in the control signals; and

to refrain, by the base station, from updating the contention window size.

8. An apparatus configured for wireless communication, the apparatus comprising:

at least one processor; and

a memory coupled to the at least one processor,

wherein the at least one processor is configured:

to acquire, by a base station, a transmission opportunity (TxOP) in a shared communication channel;

to determine, by the base station, whether scheduled uplink (SUL)

transmissions are scheduled within one or more uplink slots of the TxOP; and

to transmit, by the base station, dynamic control information identifying an autonomous uplink (AUL) transmission starting offset behavior, wherein the dynamic control information is based on results of execution of the configuration of the at least one processor to determine.

9. The apparatus of claim 8, wherein the configuration of the at least one processor to transmit includes configuration of the at least one processor to one of:

transmit the dynamic control information identifying earlier AUL transmission starting offsets in response to indication of no SUL transmissions scheduled in an uplink subframe within the TxOP; or

transmit the dynamic control information identifying later AUL transmission starting offsets in response to indication of SUL transmissions scheduled in an uplink subframe within the TxOP.

10. The apparatus of claim 8, wherein the dynamic control information includes a bitmap identifying determination of the SUL transmission scheduling for each uplink slot of the TxOP.

11. The apparatus of claim 8, wherein the dynamic control information includes a field indicating one or more sets of AUL transmission starting offset behaviors for the TxOP, wherein the one or more sets of AUL transmission starting offset behaviors includes at least one or more of:

all uplink slots of the TxOP having the SUL transmissions scheduled;

no uplink slots of the TxOP having the SUL transmissions scheduled; and

one or more groups of uplink slots out of all uplink slots of the TxOP having the SUL transmissions scheduled.

12. The apparatus of claim 8, wherein the AUL transmission starting offset behavior includes a different AUL transmission starting offset for each of a plurality of AUL user equipments (UEs) for one or more AUL slots within the TxOP.

Description:
BASE STATION CONTENTION WINDOW UPDATE WITH AUL IN TXOP

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application claims the benefit of U.S. Provisional Patent Application No. 62/710,428, entitled, "BASE STATION CONTENTION WINDOW UPDATE WITH AUL IN TXOP," filed on February 16, 2018, and U.S. Non-Provisional Patent Application 16/276,079, entitled, "BASE STATION CONTENTION WINDOW UPDATED WITH AUL IN TXOP," filed on February 14, 2019, the disclosure of both are hereby incorporated by reference in their entirety as if fully set forth below and for all application purposes.

[0002] which is expressly incorporated by reference herein in its entirety.

BACKGROUND

Field

[0003] Aspects of the present disclosure relate generally to wireless communication systems, and more particularly, to base station contention window update procedures with autonomous uplink (AUL) in a transmission opportunity (TxOP).

Background

[0004] Wireless communication networks are widely deployed to provide various communication services such as voice, video, packet data, messaging, broadcast, and the like. These wireless networks may be multiple-access networks capable of supporting multiple users by sharing the available network resources. Such networks, which are usually multiple access networks, support communications for multiple users by sharing the available network resources. One example of such a network is the Universal Terrestrial Radio Access Network (UTRAN). The UTRAN is the radio access network (RAN) defined as a part of the Universal Mobile Telecommunications System (UMTS), a third generation (3G) mobile phone technology supported by the 3rd Generation Partnership Project (3GPP). Examples of multiple-access network formats include Code Division Multiple Access (CDMA) networks, Time Division Multiple Access (TDMA) networks, Frequency Division Multiple Access (FDMA) networks, Orthogonal FDMA (OFDMA) networks, and Single-Carrier FDMA (SC-FDMA) networks.

[0005] A wireless communication network may include a number of base stations or node Bs that can support communication for a number of user equipments (UEs). A UE may communicate with a base station via downlink and uplink. The downlink (or forward link) refers to the communication link from the base station to the UE, and the uplink (or reverse link) refers to the communication link from the UE to the base station. [0006] A base station may transmit data and control information on the downlink to a UE and/or may receive data and control information on the uplink from the UE. On the downlink, a transmission from the base station may encounter interference due to transmissions from neighbor base stations or from other wireless radio frequency (RF) transmitters. On the uplink, a transmission from the UE may encounter interference from uplink transmissions of other UEs communicating with the neighbor base stations or from other wireless RF transmitters. This interference may degrade performance on both the downlink and uplink.

[0007] As the demand for mobile broadband access continues to increase, the possibilities of interference and congested networks grows with more UEs accessing the long-range wireless communication networks and more short-range wireless systems being deployed in communities. Research and development continue to advance wireless technologies not only to meet the growing demand for mobile broadband access, but to advance and enhance the user experience with mobile communications.

SUMMARY

[0008] In one aspect of the disclosure, a method of wireless communication includes acquiring, by a base station, a transmission opportunity (TxOP) in a shared communication channel, transmitting, by the base station, control signals within the TxOP, determining, by the base station, whether downlink data and scheduled uplink (SUL) data are scheduled for transmission within the TxOP, in response to determination that the downlink data is not scheduled and the SUL data is scheduled within the TxOP, detecting, by the base station, one or more autonomous uplink (AUL) transmissions within the TxOP, and updating, by the base station, a contention window size based on a successful reception rate of the SUL data and the one or more AUL transmissions, in response to determination that the downlink data is scheduled within the TxOP, updating, by the base station, the contention window size based on reception feedback associated with downlink data received from one or more served UEs, and in response to determination that the downlink data and the SUL data are not scheduled in the TxOP, signaling, by the base station, a deactivation indicator of all AUL resources allocated for the TxOP, wherein the deactivation indicator is signaled in the control signals; and refraining, by the base station, from updating the contention window size.

[0009] In an additional aspect of the disclosure, a method of wireless communication includes acquiring, by a base station, a transmission opportunity (TxOP) in a shared communication channel, determining, by the base station, whether scheduled uplink (SUL) transmissions are scheduled within one or more uplink slots of the TxOP, and transmitting, by the base station, dynamic control information identifying an autonomous uplink (AUL) transmission starting offset behavior, wherein the dynamic control information is based on the determining.

[0010] In an additional aspect of the disclosure, an apparatus configured for wireless communication includes means for acquiring, by a base station, a TxOP in a shared communication channel, means for transmitting, by the base station, control signals within the TxOP, means for deteirnining, by the base station, whether downlink data and SUL data are scheduled for transmission within the TxOP, means, executable in response to determination that the downlink data is not scheduled and the SUL data is scheduled within the TxOP, for detecting, by the base station, one or more AUL transmissions within the TxOP, and for updating, by the base station, a contention window size based on a successful reception rate of the SUL data and the one or more AUL transmissions, means, executable in response to determination that the downlink data is scheduled within the TxOP, for updating, by the base station, the contention window size based on reception feedback associated with downlink data received from one or more served UEs, and means, executable in response to determination that the downlink data and the SUL data are not scheduled in the TxOP, for signaling, by the base station, a deactivation indicator of all AUL resources allocated for the TxOP, wherein the deactivation indicator is signaled in the control signals, and for refraining, by the base station, from updating the contention window size.

[0011] In an additional aspect of the disclosure, an apparatus configured for wireless communication includes means for acquiring, by a base station, a TxOP in a shared communication channel, means for determining, by the base station, whether SUL transmissions are scheduled within one or more uplink slots of the TxOP, and means for transmitting, by the base station, dynamic control information identifying an AUL transmission starting offset behavior, wherein the dynamic control information is based on results of the means for determining.

[0012] In an additional aspect of the disclosure, a non-transitory computer-readable medium having program code recorded thereon. The program code further includes code to acquire, by a base station, a TxOP in a shared communication channel, code to transmit, by the base station, control signals within the TxOP, code to determine, by the base station, whether downlink data and SUL data are scheduled for transmission within the TxOP, code, executable in response to determination that the downlink data is not scheduled and the SUL data is scheduled within the TxOP, to detect, by the base station, one or more AUL transmissions within the TxOP, and to update, by the base station, a contention window size based on a successful reception rate of the SUL data and the one or more AUL transmissions, code, executable in response to determination that the downlink data is scheduled within the TxOP, to update, by the base station, the contention window size based on reception feedback associated with downlink data received from one or more served UEs, and code, executable in response to determination that the downlink data and the SUL data are not scheduled in the TxOP, to signal, by the base station, a deactivation indicator of all AUL resources allocated for the TxOP, wherein the deactivation indicator is signaled in the control signals, and to refrain, by the base station, from updating the contention window size.

[0013] In an additional aspect of the disclosure, a non-transitory computer-readable medium having program code recorded thereon. The program code further includes code to acquire, by a base station, a TxOP in a shared communication channel, code to determine, by the base station, whether SUL transmissions are scheduled within one or more uplink slots of the TxOP, and code to transmit, by the base station, dynamic control information identifying an AUL transmission starting offset behavior, wherein the dynamic control information is based on results of execution of the code to determine.

[0014] In an additional aspect of the disclosure, an apparatus configured for wireless communication is disclosed. The apparatus includes at least one processor, and a memory coupled to the processor. The processor is configured to acquire, by a base station, a TxOP in a shared communication channel, to transmit, by the base station, control signals within the TxOP, to determine, by the base station, whether downlink data and SUL data are scheduled for transmission within the TxOP, in response to determination that the downlink data is not scheduled and the SUL data is scheduled within the TxOP, to detect, by the base station, one or more AUL transmissions within the TxOP, and to update, by the base station, a contention window size based on a successful reception rate of the SUL data and the one or more AUL transmissions, in response to determination that the downlink data is scheduled within the TxOP, to update, by the base station, the contention window size based on reception feedback associated with downlink data received from one or more served UEs, and in response to determination that the downlink data and the SUL data are not scheduled in the TxOP, to signal, by the base station, a deactivation indicator of all AUL resources allocated for the TxOP, wherein the deactivation indicator is signaled in the control signals, and to refrain, by the base station, from updating the contention window size.

[0015] In an additional aspect of the disclosure, an apparatus configured for wireless communication is disclosed. The apparatus includes at least one processor, and a memory coupled to the processor. The processor is configured to acquire, by a base station, a TxOP in a shared communication channel, to determine, by the base station, whether SUL transmissions are scheduled within one or more uplink slots of the TxOP, and to transmit, by the base station, dynamic control information identifying an AUL transmission starting offset behavior, wherein the dynamic control information is based on results of execution of the configuration of the at least one processor to determine.

[0016] The foregoing has outlined rather broadly the features and technical advantages of examples according to the disclosure in order that the detailed description that follows may be better understood. Additional features and advantages will be described hereinafter. The conception and specific examples disclosed may be readily utilized as a basis for modifying or designing other structures for carrying out the same purposes of the present disclosure. Such equivalent constructions do not depart from the scope of the appended claims. Characteristics of the concepts disclosed herein, both their organization and method of operation, together with associated advantages will be better understood from the following description when considered in connection with the accompanying figures. Each of the figures is provided for the purpose of illustration and description, and not as a definition of the limits of the claims.

BRIEF DESCRIPTION OF THE DRAWINGS

[0017] A further understanding of the nature and advantages of the present disclosure may be realized by reference to the following drawings. In the appended figures, similar components or features may have the same reference label. Further, various components of the same type may be distinguished by following the reference label by a dash and a second label that distinguishes among the similar components. If just the first reference label is used in the specification, the description is applicable to any one of the similar components having the same first reference label irrespective of the second reference label.

[0018] FIG. 1 is a block diagram illustrating details of a wireless communication system.

[0019] FIG. 2 is a block diagram illustrating a design of a base station and a UE configured according to one aspect of the present disclosure.

[0020] FIG. 3 is a block diagram illustrating a wireless communication system including base stations that use directional wireless beams.

[0021] FIG. 4 is a block diagram illustrating example blocks executed to implement one aspect of the present disclosure.

[0022] FIG. 5 is a block diagram illustrating a FeLAA network including a base station and UEs, each configured according to one aspect of the present disclosure.

[0023] FIG. 6 is a block diagram illustrating example blocks executed to implement one aspect of the present disclosure.

[0024] FIG. 7 is a block diagram illustrating an example base station configured according to aspects of the present disclosure. DETAILED DESCRIPTION

[0025] 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 limit the scope of the disclosure. Rather, the detailed description includes specific details for the purpose of providing a thorough understanding of the inventive subject matter. It will be apparent to those skilled in the art that these specific details are not required in every case and that, in some instances, well-known structures and components are shown in block diagram form for clarity of presentation.

[0026] This disclosure relates generally to providing or participating in authorized shared access between two or more wireless communications systems, also referred to as wireless communications networks. In various embodiments, the techniques and apparatus may be used for wireless communication networks such as code division multiple access (CDMA) networks, time division multiple access (TDMA) networks, frequency division multiple access (FDMA) networks, orthogonal FDMA (OFDMA) networks, single-carrier FDMA (SC- FDMA) networks, LTE networks, GSM networks, 5 th Generation (5G) or new radio (NR) networks, as well as other communications networks. As described herein, the terms "networks" and "systems" may be used interchangeably.

[0027] An OFDMA network may implement a radio technology such as evolved UTRA (E-UTRA), IEEE 802.11, IEEE 802.16, IEEE 802.20, flash-OFDM and the like. UTRA, E-UTRA, and Global System for Mobile Communications (GSM) are part of universal mobile telecommunication system (UMTS). In particular, long term evolution (LTE) is a release of UMTS that uses E-UTRA. UTRA, E-UTRA, GSM, UMTS and LTE are described in documents provided from an organization named "3rd Generation Partnership Project" (3GPP), and cdma2000 is described in documents from an organization named "3rd Generation Partnership Project 2" (3GPP2). These various radio technologies and standards are known or are being developed. For example, the 3rd Generation Partnership Project (3GPP) is a collaboration between groups of telecommunications associations that aims to define a globally applicable third generation (3G) mobile phone specification. 3GPP long term evolution (LTE) is a 3GPP project which was aimed at improving the universal mobile telecommunications system (UMTS) mobile phone standard. The 3 GPP may define specifications for the next generation of mobile networks, mobile systems, and mobile devices. The present disclosure is concerned with the evolution of wireless technologies from LTE, 4G, 5G, NR, and beyond with shared access to wireless spectrum between networks using a collection of new and different radio access technologies or radio air interfaces.

[0028] In particular, 5G networks contemplate diverse deployments, diverse spectrum, and diverse services and devices that may be implemented using an OFDM-based unified, air interface. In order to achieve these goals, further enhancements to LTE and LTE-A are considered in addition to development of the new radio technology for 5G NR networks. The 5G NR. will be capable of scaling to provide coverage (1) to a massive Internet of things (IoTs) with an ultra-high density (e.g., ~1M nodes/km 2 ), ultra-low complexity (e.g., ~10s of bits/sec), ultra- low energy (e.g., ~10+ years of battery life), and deep coverage with the capability to reach challenging locations; (2) including mission-critical control with strong security to safeguard sensitive personal, financial, or classified information, ultra-high reliability (e.g., ~99.9999% reliability), ultra-low latency (e.g., ~ 1 ms), and users with wide ranges of mobility or lack thereof; and (3) with enhanced mobile broadband including extreme high capacity (e.g., - 10 Tbps/km 2 ), extreme data rates (e.g., multi-Gbps rate, 100+ Mbps user experienced rates), and deep awareness with advanced discovery and optimizations.

[0029] The 5G NR may be implemented to use optimized OFDM-based waveforms with scalable numerology and transmission time interval (i ll); having a common, flexible framework to efficiently multiplex services and features with a dynamic, low-latency time division duplex (TDD)/frequency division duplex (FDD) design; and with advanced wireless technologies, such as massive multiple input, multiple output (MIMO), robust millimeter wave (mm Wave) transmissions, advanced channel coding, and device-centric mobility. Scalability of the numerology in SG NR, with scaling of subcarrier spacing, may efficiently address operating diverse services across diverse spectrum and diverse deployments. For example, in various outdoor and macro coverage deployments of less than 3 GHz FDD/TDD implementations, subcarrier spacing may occur with 15 kHz, for example over 1, 5, 10, 20 MHz, and the like bandwidth. For other various outdoor and small cell coverage deployments of TDD greater than 3 GHz, subcarrier spacing may occur with 30 kHz over 80/100 MHz bandwidth. For other various indoor wideband implementations, using a TDD over the unlicensed portion of the 5 GHz band, the subcarrier spacing may occur with 60 kHz over a 160 MHz bandwidth. Finally, for various deployments transmitting with mm Wave components at a TDD of 28 GHz, subcarrier spacing may occur with 120 kHz over a 500MHz bandwidth.

[0030] The scalable numerology of the SG NR facilitates scalable TTI for diverse latency and quality of service (QoS) requirements. For example, shorter TTI may be used for low latency and high reliability, while longer TTI may be used for higher spectral efficiency. The efficient multiplexing of long and short TTIs to allow transmissions to start on symbol boundaries. SG NR also contemplates a self-contained integrated subframe design with uplink/downlink scheduling information, data, and acknowledgement in the same subframe. The self-contained integrated subframe supports communications in unlicensed or contention-based shared spectrum, adaptive uplink/downlink that may be flexibly configured on a per-cell basis to dynamically switch between uplink and downlink to meet the current traffic needs.

[0031] Various other aspects and features of the disclosure are further described below. It should be apparent that the teachings herein may be embodied in a wide variety of forms and that any specific structure, function, or both being disclosed herein is merely representative and not limiting. Based on the teachings herein one of an ordinary level of skill in the art should appreciate that an aspect disclosed herein may be implemented independently of any other aspects and that two or more of these aspects may be combined in various ways. For example, an apparatus may be implemented or a method may be practiced using any number of the aspects set forth herein. In addition, such an apparatus may be implemented or such a method may be practiced using other structure, functionality, or structure and functionality in addition to or other than one or more of the aspects set forth herein. For example, a method may be implemented as part of a system, device, apparatus, and/or as instructions stored on a computer readable medium for execution on a processor or computer. Furthermore, an aspect may comprise at least one element of a claim.

[0032] FIG. 1 is a block diagram illustrating SG network 100 including various base stations and UEs configured according to aspects of the present disclosure. The 5G network 100 includes a number of base stations 105 and other network entities. A base station may be a station that communicates with the UEs and may also be referred to as an evolved node B (eNB), a next generation eNB (gNB), an access point, and the like. Each base station 10S may provide communication coverage for a particular geographic area. In 3GPP, the term "cell" can refer to this particular geographic coverage area of a base station and/or a base station subsystem serving the coverage area, depending on the context in which the term is used.

[0033] A base station may provide communication coverage for a macro cell or a small cell, such as a pico cell or a femto cell, and/or other types of cell. A macro cell generally covers a relatively large geographic area (e.g., several kilometers in radius) and may allow unrestricted access by UEs with service subscriptions with the network provider. A small cell, such as a pico cell, would generally cover a relatively smaller geographic area and may allow unrestricted access by UEs with service subscriptions with the network provider. A small cell, such as a femto cell, would also generally cover a relatively small geographic area (e.g., a home) and, in addition to unrestricted access, may also provide restricted access by UEs having an association with the femto cell (e.g., UEs in a closed subscriber group (CSG), UEs for users in the home, and the like). A base station for a macro cell may be referred to as a macro base station. A base station for a small cell may be referred to as a small cell base station, a pico base station, a femto base station or a home base station. In the example shown in FIG. 1, the base stations 105d and lOSe are regular macro base stations, while base stations 105a-105c are macro base stations enabled with one of 3 dimension (3D), full dimension (FD), or massive MIMO. Base stations 105a- 105c take advantage of their higher dimension MIMO capabilities to exploit 3D beanifoiming in both elevation and azimuth beamforming to increase coverage and capacity. Base station 105f is a small cell base station which may be a home node or portable access point. A base station may support one or multiple (e.g., two, three, four, and the like) cells.

[0034] The 5G network 100 may support synchronous or asynchronous operation. For synchronous operation, the base stations may have similar frame timing, and transmissions from different base stations may be approximately aligned in time. For asynchronous operation, the base stations may have different frame timing, and transmissions from different base stations may not be aligned in time.

[0035] The UEs 115 are dispersed throughout the wireless network 100, and each UE may be stationary or mobile. A UE may also be referred to as a terminal, a mobile station, a subscriber unit, a station, or the like. A UE may be a cellular phone, a personal digital assistant (PDA), a wireless modem, a wireless communication device, a handheld device, a tablet computer, a laptop computer, a cordless phone, a wireless local loop (WLL) station, or the like. In one aspect, a UE may be a device that includes a Universal Integrated Circuit Card (UICC). In another aspect, a UE may be a device that does not include a UICC. In some aspects, UEs that do not include UICCs may also be referred to as internet of everything (IoE) devices. UEs 115a-115d are examples of mobile smart phone-type devices accessing 5G network 100 A UE may also be a machine specifically configured for connected communication, including machine type communication (MTC), enhanced MTC (eMTC), narrowband IoT (NB-IoT) and the like. UEs 115e- 115k are examples of various machines configured for communication that access 5G network 100. A UE may be able to communicate with any type of the base stations, whether macro base station, small cell, or the like. In FIG. 1, a lightning bolt (e.g., communication links) indicates wireless transmissions between a UE and a serving base station, which is a base station designated to serve the UE on the downlink and/or uplink, or desired transmission between base stations, and backhaul transmissions between base stations. [0036] In operation at SG network 100, base stations 105a-105c serve UEs 115a and 115b using 3D beamforming and coordinated spatial techniques, such as coordinated multipoint (CoMP) or multi-connectivity. Macro base station 105d performs backhaul communications with base stations 105a- 105c, as well as small cell, base station 105f. Macro base station 105d also transmits multicast services which are subscribed to and received by UEs 115c and 115d. Such multicast services may include mobile television or stream video, or may include other services for providing community information, such as weather emergencies or alerts, such as Amber alerts or gray alerts.

[0037] 5G network 100 also support mission critical communications with ultra-reliable and redundant links for mission critical devices, such UE 115e, which is a drone. Redundant communication links with UE 115e include from macro base stations 105d and 105e, as well as small cell base station 105f. Other machine type devices, such as UE 115f (thermometer), UE 115g (smart meter), and UE 115h (wearable device) may communicate through 5G network 100 either directly with base stations, such as small cell base station 105f, and macro base station 105e, or in multi-hop configurations by communicating with another user device which relays its information to the network, such as UE 115f communicating temperature measurement information to the smart meter, UE 115g, which is then reported to the network through small cell base station 105f. 5G network 100 may also provide additional network efficiency through dynamic, low-latency TDD/FDD communications, such as in a vehicle-to-vehicle (V2V) mesh network between UEs 115i-l 15k communicating with macro base station 105e.

[0038] FIG. 2 shows a block diagram of a design of a base station 105 and a UE 115, which may be one of the base station and one of the UEs in FIG. 1. At the base station 105, a transmit processor 220 may receive data from a data source 212 and control information from a controller/processor 240. The control information may be for the PBCH, PCFICH, PHICH, PDCCH, EPDCCH, MPDCCH etc. The data may be for the PDSCH, etc. The transmit processor 220 may process (e.g., encode and symbol map) the data and control information to obtain data symbols and control symbols, respectively. The transmit processor 220 may also generate reference symbols, e.g., for the PSS, SSS, and cell-specific reference signal. A transmit (TX) multiple-input multiple-output (MIMO) processor 230 may perform spatial processing (e.g., precoding) on the data symbols, the control symbols, and/or the reference symbols, if applicable, and may provide output symbol streams to the modulators (MODs) 232a through 232t. Each modulator 232 may process a respective output symbol stream (e.g., for OFDM, etc.) to obtain an output sample stream. Each modulator 232 may further process (e.g., convert to analog, amplify, filter, and upconvert) the output sample stream to obtain a downlink signal. Downlink signals from modulators 232a through 232t may be transmitted via the antennas 234a through 234t, respectively.

[0039] At the UE 115, the antennas 252a through 252r may receive the downlink signals from the base station 105 and may provide received signals to the demodulators (DEMODs) 254a through 254r, respectively. Each demodulator 254 may condition (e.g., filter, amplify, downconvert, and digitize) a respective received signal to obtain input samples. Each demodulator 254 may further process the input samples (e.g., for OFDM, etc.) to obtain received symbols. A MIMO detector 256 may obtain received symbols from all the demodulators 254a through 254r, perform MIMO detection on the received symbols if applicable, and provide detected symbols. A receive processor 258 may process (e.g., demodulate, deinterleave, and decode) the detected symbols, provide decoded data for the UE 115 to a data sink 260, and provide decoded control information to a controller/processor 280.

[0040] On the uplink, at the UE 115, a transmit processor 264 may receive and process data (e.g., for the PUSCH) from a data source 262 and control information (e.g., for the PUCCH) from the controller/processor 280. The transmit processor 264 may also generate reference symbols for a reference signal. The symbols from the transmit processor 264 may be precoded by a TX MIMO processor 266 if applicable, further processed by the modulators 254a through 254r (e.g., for SC-FDM, etc.), and transmitted to the base station 105. At the base station 105, the uplink signals from the UE 115 may be received by the antennas 234, processed by the demodulators 232, detected by a MIMO detector 236 if applicable, and further processed by a receive processor 238 to obtain decoded data and control information sent by the UE 115. The processor 238 may provide the decoded data to a data sink 239 and the decoded control information to the controller/processor 240.

[0041] The controllers/processors 240 and 280 may direct the operation at the base station 105 and the UE 115, respectively. The controller/processor 240 and/or other processors and modules at the base station 105 may perform or direct the execution of various processes for the techniques described herein. The controllers/processor 280 and/or other processors and modules at the UE 115 may also perform or direct the execution of the functional blocks illustrated in FIGs. 4 and 6, and/or other processes for the techniques described herein. The memories 242 and 282 may store data and program codes for the base station 105 and the UE 115, respectively. A scheduler 244 may schedule UEs for data transmission on the downlink and/or uplink.

[0042] Wireless communications systems operated by different network operating entities (e.g., network operators) may share spectrum. In some instances, a network operating entity may be configured to use an entirety of a designated shared spectrum for at least a period of time before another network operating entity uses the entirety of the designated shared spectrum for a different period of time. Thus, in order to allow network operating entities use of the full designated shared spectrum, and in order to mitigate interfering communications between the different network operating entities, certain resources (e.g., time) may be partitioned and allocated to the different network operating entities for certain types of communication.

[0043] For example, a network operating entity may be allocated certain time resources reserved for exclusive communication by the network operating entity using the entirety of the shared spectrum. The network operating entity may also be allocated other time resources where the entity is given priority over other network operating entities to communicate using the shared spectrum. These time resources, prioritized for use by the network operating entity, may be utilized by other network operating entities on an opportunistic basis if the prioritized network operating entity does not utilize the resources. Additional time resources may be allocated for any network operator to use on an opportunistic basis.

[0044] Access to the shared spectrum and the arbitration of time resources among different network operating entities may be centrally controlled by a separate entity, autonomously determined by a predefined arbitration scheme, or dynamically determined based on interactions between wireless nodes of the network operators.

[0045] In some cases, UE 115 and base station 105 may operate in a shared radio frequency spectrum band, which may include licensed or unlicensed (e.g., contention-based) frequency spectrum. In an unlicensed frequency portion of the shared radio frequency spectrum band, UEs 115 or base stations 105 may traditionally perform a medium-sensing procedure to contend for access to the frequency spectrum. For example, UE 115 or base station 105 may perform a listen before talk (LBT) procedure such as a clear channel assessment (CCA) prior to communicating in order to determine whether the shared channel is available. A CCA may include an energy detection procedure to determine whether there are any other active transmissions. For example, a device may infer that a change in a received signal strength indicator (RSSI) of a power meter indicates that a channel is occupied. Specifically, signal power that is concentrated in a certain bandwidth and exceeds a predetermined noise floor may indicate another wireless transmitter. A CCA also may include detection of specific sequences that indicate use of the channel. For example, another device may transmit a specific preamble prior to transmitting a data sequence. In some cases, an LBT procedure may include a wireless node adjusting its own backoff window based on the amount of energy detected on a channel and/or the acknowledge/negative-acknowledge (ACK/NACK) feedback for its own transmitted packets as a proxy for collisions. [0046] Use of a medium-sensing procedure to contend for access to an unlicensed shared spectrum may result in communication inefficiencies. This may be particularly evident when multiple network operating entities (e.g., network operators) are attempting to access a shared resource. In 5G network 100, base stations 105 and UEs 115 may be operated by the same or different network operating entities. In some examples, an individual base station 105 or UE 115 may be operated by more than one network operating entity. In other examples, each base station 105 and UE 115 may be operated by a single network operating entity. Requiring each base station 105 and UE 115 of different network operating entities to contend for shared resources may result in increased signaling overhead and communication latency.

[0047] FIG. 3 illustrates an example of a timing diagram 300 for coordinated resource partitioning.

The timing diagram 300 includes a superframe 305, which may represent a fixed duration of time (e.g., 20 ms). Superframe 305 may be repeated for a given communication session and may be used by a wireless system such as 5G network 100 described with reference to FIG. 1. The superframe 305 may be divided into intervals such as an acquisition interval (A-INT) 310 and an arbitration interval 315. As described in more detail below, the A-INT 310 and arbitration interval 315 may be subdivided into sub-intervals, designated for certain resource types, and allocated to different network operating entities to facilitate coordinated communications between the different network operating entities. For example, the arbitration interval 315 may be divided into a plurality of sub-intervals 320. Also, the superframe 305 may be further divided into a plurality of subframes 325 with a fixed duration (e.g., 1 ms). While timing diagram 300 illustrates three different network operating entities (e.g., Operator A, Operator B, Operator C), the number of network operating entities using the superframe 305 for coordinated communications may be greater than or fewer than the number illustrated in timing diagram 300.

[0048] The A-INT 310 may be a dedicated interval of the superframe 305 that is reserved for exclusive communications by the network operating entities. In some examples, each network operating entity may be allocated certain resources within the A-INT 310 for exclusive communications. For example, resources 330-a may be reserved for exclusive communications by Operator A, such as through base station 105a, resources 330-b may be reserved for exclusive communications by Operator B, such as through base station 105b, and resources 330-c may be reserved for exclusive communications by Operator C, such as through base station 105c. Since the resources 330-a are reserved for exclusive communications by Operator A, neither Operator B nor Operator C can communicate during resources 330-a, even if Operator A chooses not to communicate during those resources. That is, access to exclusive resources is limited to the designated network operator. Similar restrictions apply to resources 330-b for Operator B and resources 330-c for Operator C. The wireless nodes of Operator A (e.g. UEs 1 IS or base stations 105) may communicate any information desired during their exclusive resources 330-a, such as control information or data.

[0049] When communicating over an exclusive resource, a network operating entity does not need to perform any medium sensing procedures (e.g., listen-before-talk (LBT) or clear channel assessment (CCA)) because the network operating entity knows that the resources are reserved. Because only the designated network operating entity may communicate over exclusive resources, there may be a reduced likelihood of interfering communications as compared to relying on medium sensing techniques alone (e.g., no hidden node problem). In some examples, the A-INT 310 is used to transmit control information, such as synchronization signals (e.g., SYNC signals), system information (e.g., system information blocks (SIBs)), paging information (e.g., physical broadcast channel (PBCH) messages), or random access information (e.g., random access channel (RACH) signals). In some examples, all of the wireless nodes associated with a network operating entity may transmit at the same time during their exclusive resources.

[0050] In some examples, resources may be classified as prioritized for certain network operating entities. Resources that are assigned with priority for a certain network operating entity may be referred to as a guaranteed interval (G-INT) for that network operating entity. The interval of resources used by the network operating entity during the G-INT may be referred to as a prioritized sub-interval. For example, resources 335-a may be prioritized for use by Operator A and may therefore be referred to as a G-INT for Operator A (e.g., G-INT-OpA). Similarly, resources 335-b may be prioritized for Operator B, resources 335-c may be prioritized for Operator C, resources 335-d may be prioritized for Operator A, resources 335-e may be prioritized for Operator B, and resources 335-f may be prioritized for operator C.

[0051] The various G-INT resources illustrated in FIG. 3 appear to be staggered to illustrate their association with their respective network operating entities, but these resources may all be on the same frequency bandwidth. Thus, if viewed along a time-frequency grid, the G-INT resources may appear as a contiguous line within the superframe 305. This partitioning of data may be an example of time division multiplexing (TDM). Also, when resources appear in the same sub-interval (e.g., resources 340-a and resources 335-b), these resources represent the same time resources with respect to the superframe 305 (e.g., the resources occupy the same sub-interval 320), but the resources are separately designated to illustrate that the same time resources can be classified differently for different operators. [0052] When resources are assigned with priority for a certain network operating entity (e.g., a G- INT), that network operating entity may communicate using those resources without having to wait or perform any medium sensing procedures (e.g., LBT or CCA). For example, the wireless nodes of Operator A are free to communicate any data or control information during resources 335-a without interference from the wireless nodes of Operator B or Operator C.

[0053] A network operating entity may additionally signal to another operator that it intends to use a particular G-INT. For example, referring to resources 335-a, Operator A may signal to Operator B and Operator C that it intends to use resources 335-a. Such signaling may be referred to as an activity indication. Moreover, since Operator A has priority over resources 335-a, Operator A may be considered as a higher priority operator than both Operator B and Operator C. However, as discussed above, Operator A does not have to send signaling to the other network operating entities to ensure interference-free transmission during resources 335- a because the resources 335-a are assigned with priority to Operator A.

[0054] Similarly, a network operating entity may signal to another network operating entity that it intends not to use a particular G-INT. This signaling may also be referred to as an activity indication. For example, referring to resources 335-b, Operator B may signal to Operator A and Operator C that it intends not to use the resources 335-b for communication, even though the resources are assigned with priority to Operator B. With reference to resources 335-b, Operator B may be considered a higher priority network operating entity than Operator A and Operator C. In such cases, Operators A and C may attempt to use resources of sub-interval 320 on an opportunistic basis. Thus, from the perspective of Operator A, the sub-interval 320 that contains resources 335-b may be considered an opportunistic interval (O-INT) for Operator A (e.g., O-INT-OpA). For illustrative purposes, resources 340-a may represent the O-INT for Operator A. Also, from the perspective of Operator C, the same sub-interval 320 may represent an O-INT for Operator C with corresponding resources 340-b. Resources 340-a, 335-b, and 340-b all represent the same time resources (e.g., a particular sub-interval 320), but are identified separately to signify that the same resources may be considered as a G-INT for some network operating entities and yet as an O-INT for others.

[0055] To utilize resources on an opportunistic basis, Operator A and Operator C may perform medium-sensing procedures to check for communications on a particular channel before transmitting data. For example, if Operator B decides not to use resources 335-b (e.g., G-INT- OpB), then Operator A may use those same resources (e.g., represented by resources 340-a) by first checking the channel for interference (e.g., LBT) and then transmitting data if the channel was determined to be clear. Similarly, if Operator C wanted to access resources on an opportunistic basis during sub-interval 320 (e.g., use an O-INT represented by resources 340- b) in response to an indication that Operator B was not going to use its G-INT, Operator C may perform a medium sensing procedure and access the resources if available. In some cases, two operators (e.g., Operator A and Operator C) may attempt to access the same resources, in which case the operators may employ contention-based procedures to avoid interfering communications. The operators may also have sub-priorities assigned to them designed to determine which operator may gain access to resources if more than operator is attempting access simultaneously.

[0056] In some examples, a network operating entity may intend not to use a particular G-INT assigned to it, but may not send out an activity indication that conveys the intent not to use the resources. In such cases, for a particular sub-interval 320, lower priority operating entities may be configured to monitor the channel to determine whether a higher priority operating entity is using the resources. If a lower priority operating entity determines through LBT or similar method that a higher priority operating entity is not going to use its G-INT resources, then the lower priority operating entities may attempt to access the resources on an opportunistic basis as described above.

[0057] In some examples, access to a G-INT or O-INT may be preceded by a reservation signal (e.g., request-to-send (RTS)/clear-to-send (CTS)), and the contention window (CW) may be randomly chosen between one and the total number of operating entities.

[0058] In some examples, an operating entity may employ or be compatible with coordinated multipoint (CoMP) communications. For example an operating entity may employ CoMP and dynamic time division duplex (TDD) in a G-INT and opportunistic CoMP in an O-INT as needed.

[0059] In the example illustrated in FIG.3, each sub-interval 320 includes a G-INT for one of Operator A, B, or C. However, in some cases, one or more sub-intervals 320 may include resources that are neither reserved for exclusive use nor reserved for prioritized use (e.g., unassigned resources). Such unassigned resources may be considered an O-INT for any network operating entity, and may be accessed on an opportunistic basis as described above.

[0060] In some examples, each subframe 325 may contain 14 symbols (e.g., 250-μ8 for 60 kHz tone spacing). These subframes 325 may be standalone, self-contained Interval-Cs (ITCs) or the subframes 325 may be a part of a long ITC. An ITC may be a self-contained transmission starting with a downlink transmission and ending with a uplink transmission. In some embodiments, an ITC may contain one or more subframes 325 operating contiguously upon medium occupation. In some cases, there may be a maximum of eight network operators in an A-INT 310 (e.g., with duration of 2 ms) assuming a 250-μβ transmission opportunity.

[0061] Although three operators are illustrated in FIG. 3, it should be understood that fewer or more network operating entities may be configured to operate in a coordinated manner as described above. In some cases, the location of the G-INT, O-INT, or A-INT within superframe 305 for each operator is determined autonomously based on the number of network operating entities active in a system. For example, if there is only one network operating entity, each sub-interval 320 may be occupied by a G-INT for that single network operating entity, or the sub-intervals 320 may alternate between G-INTs for that network operating entity and O-INTs to allow other network operating entities to enter. If there are two network operating entities, the sub-intervals 320 may alternate between G-INTs for the first network operating entity and G-INTs for the second network operating entity. If there are three network operating entities, the G-INT and O-INTs for each network operating entity may be designed as illustrated in FIG. 3. If there are four network operating entities, the first four sub-intervals 320 may include consecutive G- INTs for the four network operating entities and the remaining two sub-intervals 320 may contain O-INTs. Similarly, if there are five network operating entities, the first five sub- intervals 320 may contain consecutive G-INTs for the five network operating entities and the remaining sub-interval 320 may contain an O-INT. If there are six network operating entities, all six sub-intervals 320 may include consecutive G-INTs for each network operating entity. It should be understood that these examples are for illustrative purposes only and that other autonomously determined interval allocations may be used.

[0062] It should be understood that the coordination framework described with reference to FIG. 3 is for illustration purposes only. For example, the duration of superframe 305 may be more or less than 20 ms. Also, the number, duration, and location of sub-intervals 320 and subframes 325 may differ from the configuration illustrated. Also, the types of resource designations (e.g., exclusive, prioritized, unassigned) may differ or include more or less sub-designations.

[0063] Within a transmission opportunity (TxOP) acquired by a base station, after transmission of the PDCCH, two different scenarios may exist. In a first scenario, the base station transmits data (e.g., PDSCH) within the TxOP along with any scheduled uplink portions which may overlap with configured autonomous uplink (AUL) resources. In such a scenario, current license assisted access (LAA) procedures will not consider uplink transmissions for contention window update at the base station. Instead, feedback for the downlink data transmissions would be used. In a second scenario, the base station has no data to transmit (e.g., no PDSCH transmission); and any scheduled uplink portions may again overlap with the configured AUL resources. In such a scenario, it may be unclear how to handle contention window updates at the base station. Current LAA procedures provide for contention window update when less than 10% of the scheduled uplink (SUL) transmission blocks are successfully received when no AUL transmissions are allowed.

[0064] In such a second scenario, when AUL transmissions are permitted and possibly presented, it may be difficult to incorporate AUL performance with the SUL in detennining when to perform contention window update. The base station may not be capable of determining whether a failure to detect AUL, using a demodulation reference signal (DMRS)-based detection or AUL uplink control indicator (UCI)-based detection, is due to a hidden interferer or due simply to no AUL UEs transmitting. Thus, with a hidden interferer, DMRS detection may fail resulting in no contention window update even when the uplink transmission block (TB) is not successfully received, or where DMRS detection fails because no AUL UEs have transmitted on the uplink, an unnecessary contention window update may result at the base station.

[0065] A base station would not be expected to acquire a TxOP with no scheduled downlink data and no scheduled control signals (e.g., downlink control information (DCIs)) in LAA unless it knows, such as through buffer status report (BSR) from the UE, that there may be uplink traffic for some served UEs. In such case, it may be efficient for the base station to schedule transmissions on the uplink regions (e.g., SUL) once it has accessed the medium and not depend exclusively on AUL transmissions from the UEs. Accordingly, various aspects of the present disclosure are directed to adjusting availability of AUL resources based on the scheduled communications within the TxOP and allowing AUL consideration for contention window updates when SUL transmissions are available without scheduled downlink transmissions.

[0066] FIG. 4 is a block diagram illustrating example blocks executed to implement one aspect of the present disclosure. The example blocks will also be described with respect to base station 105 as illustrated in FIG. 7. FIG. 7 is a block diagram illustrating base station 105 configured according to one aspect of the present disclosure. Base station 105 includes the structure, hardware, and components as illustrated for eNB 105 of FIG. 2. For example, base station 105 includes controller/processor 240, which operates to execute logic or computer instructions stored in memory 242, as well as controlling the components of base station 105 that provide the features and functionality of base station 105. Base station 105, under control of controller/processor 240, transmits and receives signals via wireless radios 700a-t and antennas 234a-t. Wireless radios 700a-t includes various components and hardware, as illustrated in FIG. 2 for base station 105, including modulator/demodulators 232a-t, MIMO detector 236, receive processor 238, transmit processor 220, and TX MIMO processor 230. [0067] At block 400, a base station acquires a TxOP on a shared communication channel. A base station operating using FeLAA may perform a listen before talk (LBT) procedure to acquire the shared channel. For example base station 105, under control of controller/processor 240, executes LBT logic 701, stored in memory 242. The execution environment of LBT logic 701 allows the base station to monitor and acquire the shared channel. Base station 10S obtains a maximum channel occupancy time (MCOT) after acquiring the channel and schedules the TxOP with multiple configured downlink and uplink slots.

[0068] At block 401, the base station transmits control signals within the TxOP. Base station 105 executes control signal generator 702, stored in memory 242, and transmits the control signals, via wireless radios 700a-t and antennas 234a-t, to configure communications between various UEs, whether through scheduled communications (e.g., SUL) or by configuring AUL resources within the TxOP.

[0069] A determination is made, at block 402, whether downlink data is scheduled in the TxOP. Base station 105 may determine downlink data scheduling via scheduler 244. If downlink data is scheduled in TxOP, then, at block 403, the base station may update its contention window size using any downlink data feedback received from served UEs. The contention window for base station 105 is related to the attempted transmissions base station 105 makes. The feedback related to the downlink data provides a more direct evaluation of the transmission channel quality, which may have a more accurate effect on contention window updates.

[0070] If the base station determines that no downlink data is scheduled, at block 402, then, at block 404, a further determination is made whether SUL transmissions are scheduled within the TxOP. Base station 105 may determine whether SUL transmissions are scheduled via scheduler 244. If no SUL transmissions are scheduled, and there is no downlink data, the base station, at block 405 deactivates all AUL resources within the TxOP. Because base station 105 may be incapable of distinguishing between a failure to detect AUL transmissions because of an interference-based DMRS-based detection failure and a failure to detect AUL transmissions because the AUL UE simply failed to transmit, there would be no benefit to allowing AUL transmissions where no SUL or downlink transmissions are scheduled in the TxOP.

[0071] At block 406, the base station refrains from updating its contention window size within the TxOP. Without signal reception or quality information available from either downlink feedback or uplink transmissions, there is no basis for updating the contention window size.

[0072] If the base station determines that SUL transmissions are scheduled in the TxOP at block 404, then, at block 407, the base station detects AUL transmissions. When SUL transmissions are scheduled without any downlink data to transmit in a TxOP, base station 105 may beneficially allow AUL UEs to transmit during configured AUL resources.

[0073] At block 408, the base station may update its contention window using a reception success rate for both SUL and AUL transmissions. Without downlink data feedback, base station 105 may use the reception success rate for the uplink communications to update its contention window size. Base station 105, under control of controller/processor 240, executes contention window update logic 704. The execution environment of contention window update logic 704 allows base station 105 to update its contention window using the uplink transmissions.

[0074] FIG. 5 is a block diagram illustrating a FeLAA network 50 including a base station 105 and UEs 115a- 115d, each configured according to one aspect of the present disclosure. Where both control (e.g., PDCCH, CPDCCH, etc.) and data (e.g., PDSCH) are scheduled for transmission in a TxOP acquired by base station 105, both SUL and AUL resources are configured to allow UEs 115a- 115d SUL and AUL transmissions. In such case, base station 105 will use feedback from downlink transmissions without any uplink transmission performance for contention window updates. For example, when base station transmits downlink data to UEs 115a and 115b during the TxOP, it may use acknowledgement signals (ACK/NACK), channel state information (CSI), and the like to determine updates to the contention window.

[0075] Where only control information is to be transmitted in a TxOP without SUL, base station 105 deactivates any AUL resources in the TxOP using a deactivation indicator in the control signals. In such case, base station 105 will not update its contention window. Where control and SUL are to be transmitted in a TxOP, base station 105 would maintain AUL resources for AUL transmissions. In such case, base station 105 would use both SUL reception performance and detected AUL for contention window updates. For example, UEs 115a and 115b are each scheduled for SUL during the TxOP, while UE 115d has uplink data that is transmitted using the configured AUL resources. Base station 105 may use the successful reception rate of uplink transmissions from UEs 115a, 115b, and 115d to update it contention window size.

[0076] FIG. 6 is a block diagram illustrating example blocks executed to implement one aspect of the present disclosure. The example blocks will also be described with respect to base station 105 as illustrated in FIG. 7.

[0077] At block 600, a base station acquires a TxOP on a shared communication channel. As noted above, base station 105 operating using FeLAA may perform a listen before talk (LBT) procedure to acquire the shared channel. Base station 105 executes LBT logic 701, stored in memory 242, and obtains a maximum channel occupancy time (MCOT) after acquiring the channel and schedules the TxOP with multiple configured downlink and uplink slots.

[0078] At block 601, a determination is made whether SUL transmissions are scheduled within the TxOP. Base station 105 may determine whether SUL transmissions are scheduled via scheduler 244. AUL transmissions may be dynamically provided AUL transmission offset information depending on whether SUL transmissions are scheduled in the TxOP. If no SUL transmissions are scheduled, then, at block 602, the base station transmits dynamic control information identifying an earlier AUL transmission start offset. Where no SUL transmissions are scheduled in a TxOP, base station 105 may desire to minimize any transmission gaps in the TxOP by providing an earlier AUL transmission offset. Base station 105 may select the earlier offsets within AUL transmission start offset 704, stored in memory 242, and include such offsets in control signals generated by execution of control signal generator 702 and transmitted via wireless radios 700a-t and antennas 234a-t. With no SUL to protect, AUL UEs may be more aggressive in acquiring the channel for AUL transmissions.

[0079] If the base station detects SUL scheduled in the TxOP at block 601, it may transmit dynamic control information identifying a later AUL transmission start offset. As base station 105 detects scheduled SUL, it may desire to protect and prioritize the SUL. Therefore, later AUL transmission offsets selected from AUL transmission start offset 704 may be provided to the AUL UEs in control signals generated by execution of control signal generator 702 and transmitted via wireless radios 700a-t and antennas 234a-t.

[0080] Referring back to FIG. 5, such additional aspects of the present disclosure are directed to dynamic configuration of AUL UE starting positions within a TxOP acquired by base station 105. In further enhanced LAA (FeLAA), when an AUL UE (e.g., UE 115d) is allocated to occupy the full channel bandwidth (e.g., occupying all interlaces), the AUL UE should be configured with an AUL-specific transmission start offset value range for AUL transmissions. In general, because AUL are not scheduled, base station 105 would not necessarily know which UE may have AUL data for transmission. As such, base station 105 would allocate multiple AUL UEs to the same AUL resource. For example, base station 105 may allocate UEs 115c and 115d for the same AUL resource. The transmission start offset value not only assists in different AUL UEs (UEs 115c and 115d) avoiding collisions among themselves, the value of the offset may also assist in avoiding collisions between the AUL and SUL transmissions (SUL UEs 115a and 115b). The offset may be randomly generated within a specific range as supported for an AUL UE. The UE can be configured with different range values for AUL transmissions outside of the base station 105's obtained maximum channel occupancy time (MCOT) and AUL transmission inside the MCOT.

[0081] For AUL transmissions outside of the base station-obtained MCOT, an AUL UE (e.g., UEs 115c and 11 Sd) can randomly select an offset value from a more-aggressive set of offset times (e.g., offset 6 {16, 25, 24, 43, 52, 61ms}), while for AUL transmissions inside of the MCOT, the AUL UE (UEs 115c and 115d) can randomly select an offset value from a more conservative set of offset times (e.g., offset e {34, 43, 52, 61ms}). Aspects of the present disclosure provide for a dynamic range of AUL UEs starting offset values within a base station- acquired MCOT in order to improve spectrum efficiency.

[0082] For an uplink slot in base station 105's TxOP, base station 105 may want to have different AUL behaviors for uplink starting offsets depending on whether there are SUL scheduled or not. If SUL transmissions are scheduled in the slot, base station 105 may want to have later AUL starting offsets to give priority to the SUL UEs. Thus, AUL transmissions may still occur even though the SUL UEs fail to acquire the shared channel. If there are no SUL transmissions scheduled in a slot, base station 105 may want to have earlier AUL starting offsets in order to reduce the gap of signal transmissions in the TxOP. The different AUL starting offsets may be explicitly indicated in dynamic control information to control the AUL transmission starting offset behavior. Because this is targeting AUL UEs (e.g., UEs 115c and 115d), the dynamic control information may be included in a broadcast signal, such as CPDCCH.

[0083] It should be noted that the dynamic control information may be bundled with an indication of whether the slot has SUL scheduled or not.

[0084] Additional aspects of the present disclosure provide for directly indicating uplink slots scheduled for SUL. The additional aspects may provide for base station 105 (FIG. 5) to indicate which uplink slots are scheduled for SUL transmission. In one example aspect, the indication can be in the form of a bitmap identifying all uplink slots of a TxOP. For example, a '0' may indicate uplink slots without scheduled SUL, while a T may indicate uplink slots with scheduled SUL if the corresponding UE gains channel access. For the uplink slots identified by the bitmap as having scheduled SUL, any AUL UEs (e.g., UE 115c and 115d) may either decide not to transmit on such slots or may select a later transmission start offset to protect the potential SUL transmissions on these slots. For uplink slots identified by the bitmap as having no scheduled SULs, the AUL UEs may select a more aggressive starting offset.

[0085] While a bitmap identifying the SUL scheduling for each uplink slot in a TxOP is efficient to accurately control AUL UE behavior, a number of bits equal to the number of uplink slots would be used for such a bit map (currently, up to 6 uplink slots may be included in a TxOP). Another example aspect provides for AUL behavior to be generally controlled using fewer bits. For example, 2 bits may be used to indicate general SUL scheduling (e.g., 00 - all slots have scheduled SUL; 11 - no slots have scheduled SUL; 01 - the first half of uplink slots have scheduled SUL; 10 - the last half of uplink slots have scheduled SUL). Such a lower-bit field would mainly affect which set of starting positions is allowed for AUL in each slot. The field may not need to match the scheduled SUL allocation exactly in the uplink slots.

[0086] In additional aspects of the present disclosure, base station 105 (FIG. 5) may dynamically offset AUL transmissions within a base station TxOP. Base station 105 may dynamically indicate the starting position for each AUL subframe to different UEs. Thus, base station 105 may configure different AUL UEs (e.g., UEs 115c and 115d) to have different starting positions for an AUL subframe. Such explicit indication may be used to prioritize certain AUL UEs within the subframe, to prioritize SUL within the subframe, or to mitigate possible collisions. Base station 105 may also configure each AUL UE (e.g., UEs 115c and 115d) with different starting positions for different AUL subframes, which may be used to provide fairness among AUL UEs over the long term, to prioritize SUL, or to mitigate possible collisions.

[0087] Those of skill in the art would understand that information and signals may be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referenced throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

[0088] The functional blocks and modules in FIGs. 4 and 6 may comprise processors, electronics devices, hardware devices, electronics components, logical circuits, memories, software codes, firmware codes, etc., or any combination thereof.

[0089] Those of skill would further appreciate that the various illustrative logical blocks, modules, circuits, and algorithm steps described in connection with the disclosure herein may be implemented as electronic hardware, computer software, or combinations of both. To clearly illustrate this interchangeability of hardware and software, various illustrative components, blocks, modules, circuits, and steps have been described above generally in terms of their functionality. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present disclosure. Skilled artisans will also readily recognize that the order or combination of components, methods, or interactions that are described herein are merely examples and that the components, methods, or interactions of the various aspects of the present disclosure may be combined or performed in ways other than those illustrated and described herein.

[0090] The various illustrative logical blocks, modules, and circuits described in connection with the disclosure herein may be implemented or performed with a general-purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general-purpose processor may be a microprocessor, but in the alternative, the processor may be any conventional processor, controller, microcontroller, or state machine. A processor may also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.

[0091] The steps of a method or algorithm described in connection with the disclosure herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, a removable disk, a CD- ROM, or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor such that the processor can read information from, and write information to, the storage medium. In the alternative, the storage medium may be integral to the processor. The processor and the storage medium may reside in an ASIC. The ASIC may reside in a user terminal. In the alternative, the processor and the storage medium may reside as discrete components in a user terminal.

[0092] In one or more exemplary designs, the functions described may be implemented in hardware, software, firmware, or any combination thereof. If implemented in software, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. Computer-readable storage media may be any available media that can be accessed by a general purpose or special purpose computer. By way of example, and not limitation, such computer-readable media can comprise RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to carry or store desired program code means in the form of instructions or data structures and that can be accessed by a general-purpose or special -purpose computer, or a general-purpose or special-purpose processor. Also, a connection may be properly termed a computer-readable medium. For example, if the software is transmitted from a website, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, or digital subscriber line (DSL), then the coaxial cable, fiber optic cable, twisted pair, or DSL, are included in the definition of medium. Disk and disc, as used herein, includes compact disc (CD), laser disc, optical disc, digital versatile disc (DVD), floppy disk and blu-ray disc where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above should also be included within the scope of computer-readable media.

[0093] As used herein, including in the claims, the term "and/or," when used in a list of two or more items, means that any one of the listed items can be employed by itself, or any combination of two or more of the listed items can be employed. For example, if a composition is described as containing components A, B, and/or C, the composition can contain A alone; B alone; C alone; A and B in combination; A and C in combination; B and C in combination; or A, B, and C in combination. Also, as used herein, including in the claims, "or" as used in a list of items prefaced by "at least one of indicates a disjunctive list such that, for example, a list of "at least one of A, B, or C" means A or B or C or AB or AC or BC or ABC (i.e., A and B and C) or any of these in any combination thereof.

[0094] The previous description of the disclosure is provided to enable any person skilled in the art to make or use the disclosure. Various modifications to the disclosure will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other variations without departing from the spirit or scope of the disclosure. Thus, the disclosure is not intended to be limited to the examples and designs described herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.