BHAMRI ANKIT (DE)
HINDY AHMED (US)
CHEEMA SHER ALI (DE)
NANGIA VIJAY (US)
US20200366363A1 | 2020-11-19 |
CLAIMS 1. A repeater node apparatus, the apparatus comprising: a transceiver that: receives a first configuration from a base station of a mobile wireless communication network, the first configuration comprising channel state information reference signal (“CSI-RS”) configuration information for amplifying and forwarding CSI-RS beams to a user equipment (“UE”) device from the repeater node; receives a second configuration from the base station, the second configuration comprising configuration information for performing measurement and reporting of the CSI-RS beams; receives repeater-specific CSI-RS to be forwarded to the UE device; and transmits the repeater-specific CSI-RS to the UE device according to the first configuration. 2. The apparatus of claim 1, wherein the first configuration further comprises receiving time information of a location of slots with CSI-RS and beam information for each CSI-RS symbol. 3. The apparatus of claim 2, wherein the beam information comprises an association of one or more antenna ports at the base station with one or more antenna ports at the repeater for each symbol such that one or more CSI-RS received from the base station are grouped for one symbol and associated with one antenna port at the repeater. 4. The apparatus of claim 1, wherein, in response to identifying that the UE device is connected to the base station through the repeater node, the first configuration is limited to a time domain and the repeater node is configured with time and beam information such that CSI-RS resource elements (“REs”) for different ports are mapped to different orthogonal frequency-division multiplexing (“OFDM”) symbols. 5. The apparatus of claim 1, wherein the transceiver receives an indication from the base station to apply beam refinement on a single CSI-RS port beam, wherein a different beam configuration is applied for each of multiple symbols that are received on the single CSI- RS port beam from the base station. 6. The apparatus of claim 1, wherein the transceiver: receives different CSI-RS resources from the base station using a same spatial filter, the different CSI-RS resources receiving in different symbols; and transmits CSI-RS corresponding to the different CSI-RS resources using different beams. 7. The apparatus of claim 1, wherein the transceiver receives, from the base station, a CSI- RS resource set configuration and an indication for reporting CSI measurements for beam refinement for a link between the base station and the repeater node. 8. A base station apparatus, the apparatus comprising: a transceiver that: transmits a first configuration to a repeater node of a mobile wireless communication network, the first configuration comprising channel state information reference signal (“CSI-RS”) configuration information for amplifying and forwarding CSI-RS beams to a user equipment (“UE”) device from the repeater node; transmits a second configuration to the repeater node, the second configuration comprising configuration information for performing measurement and reporting of the CSI-RS beams; transmits repeater-specific CSI-RS to the repeater node to be forwarded to the UE device; and transmits an indication to the UE device to report repeater-specific CSI- RS measurements to the base station. 9. The apparatus of claim 8, wherein the first configuration further comprises receiving time information of a location of slots with CSI-RS and beam information for each CSI-RS symbol. 10. The apparatus of claim 9, wherein the beam information comprises an association of one or more antenna ports at the base station with one or more antenna ports at the repeater for each symbol such that one or more CSI-RS received from the base station are grouped for one symbol and associated with one antenna port at the repeater. 11. The apparatus of claim 8, further comprising a processor that, in response to identifying that the UE device is connected to the base station through the repeater node, limits the first configuration to a time domain and configures the repeater node with time and beam information such that CSI-RS resource elements (“REs”) for different ports are mapped to different orthogonal frequency-division multiplexing (“OFDM”) symbols. 12. The apparatus of claim 8, wherein the transceiver transmits an indication to the repeater node to apply beam refinement on a single CSI-RS port beam, wherein a different beam configuration is applied for each of multiple symbols that are received on the single CSI- RS port beam from the base station. 13. The apparatus of claim 12, further comprising a processor that configures the UE device to report at least one of CSI-RS resource indicator (“CRI”) reference signal received power and CRI signal-to-noise and interference ratio associated with a symbol identifier for the base station to identify a beam to be used at the repeater node. 14. The apparatus of claim 8, further comprising a processor that configures the repeater node to receive different CSI-RS resources using a same spatial filter, wherein the different CSI-RS resources are transmitted in different symbols using different beams. 15. The apparatus of claim 8, further comprising a processor that: configures the repeater node with a CSI-RS resource set configuration and an indication for reporting CSI measurements for beam refinement for a link between the base station and the repeater node; compares CSI measurements reported from the repeater node and the UE device; and at least one of selects a beam for each link between the base station, the UE, and the repeater node, and associates beams of links between the base station, the UE, and the repeater node. 16. The apparatus of claim 8, further comprising a processor that: configures different repeaters to forward repeater-specific RS to the UE device; and assigns CSI-RS beams to the different repeaters and configuring the different repeaters with time and directional information to forward the CSI-RS to the UE device. 17. The apparatus of claim 16, wherein the processor associates one of the different repeaters with ports on a given symbol with one code division multiplexing (“CDM”) and associating another one of the different repeaters with ports on a same symbol but with a different CDM in response to determining that the CSI-RS ports with CDM in a frequency domain should be applied. 18. The apparatus of claim 17, wherein the processor: configures the UE device to report measurements of repeater-specific RS to the base station; and selects a repeater of the different repeaters that can serve the UE device for data transmission. 19. The apparatus of claim 8, further comprising a processor that configures the UE device to report a quality of at least one configured link between the UE and a repeater node. 20. A user equipment (“UE”) apparatus, the apparatus comprising: a transceiver that: receives, from a base station of a mobile wireless communication network, an indication to report repeater-specific reference signal (“RS”) measurements associated with a repeater node and repeater- specific channel state information RS (“CSI-RS”); and transmits, to the base station, repeater-specific RS measurements associated with the received repeater-specific CSI-RS. |
[0110] In another implementation, new rows are added to the CSI-RS location table or a new table can be configured, when a smart repeater is used, where patterns are limited to: ^ Only FDM (examples illustrated in Figure 5A, but different patterns are also possible for densities p=1,2,4); ^ Only TDM (examples illustrated in Figure 5B, but different TDM different patterns are also possible); ^ FDM+TDM (examples illustrated in Figure 5C, but different patterns are also possible for densities p=1,2,4 and different TDM patterns); ^ TD-CDM (examples illustrated in figure 5D, but different patterns are also possible for TD-CDM); and ^ FDM+TD-CDM (examples illustrated in Figure 5E). [0111] In one implementation, more patterns are accommodated by supporting additional values of density such as p=2,4. [0112] In one implementation, the maximum number of CSI-RS ports are limited/restricted (due to absence of FD-CDM) to less than 32 ports, when smart repeater is used. [0113] In one embodiment directed to a repeater with measurement (baseband) capability, shown in Figures 6A and 6B, a smart repeater(s) with a baseband for CSI-RS measurement is configured by the network with a CSI-RS resource set configuration and an indication for reporting CSI measurements for beam refinement between BS and repeater. The repeater, in one embodiment, measures the CSI-RS from the BS based on the configured CSI-RS resource set and reports CSI measurements that include CRI-RSRP, CRI-SINR, and/or the like, for each configured CSI-RS (or report the largest CSI measurement or a subset of CSI measurements). Upon receiving the report, in one embodiment, the BS may select the beam that is associated with the best measured CSI-RS for DL data transmission to the repeater. [0114] Based upon predefined thresholds of the measured CSI-RS from the repeater and from the UE, in one embodiment, the BS may decide to select the beam with the highest CRI- RSRP/CRI-SINR (or a suitable beam, e.g., a beam with CSI above a threshold) reported from the UE (e.g., measured on the beam amplified and forwarded by the repeater) and use it also for the link between the BS and the smart repeater if the beam with the highest RSRP (or the suitable beam) reported from the UE is the same as that reported by the smart repeater, or if the beam with highest RSRP (or the suitable beam) reported by the UE satisfies the predefined threshold. [0115] In one embodiment, if the beam with the highest RSRP (or the suitable beam) reported from the UE is different than the one reported by the repeater and the beam with highest RSRP (or the suitable beam) reported by the UE doesn’t satisfy a predefined threshold, then the BS selects the beam with the highest RSRP (or a suitable beam above an RSRP threshold) reported by the repeater for the link between the repeater and BS and configures the repeater to use the beam direction/spatial filter associated with the highest RSRP beam (or a suitable beam above an RSRP threshold) reported by the UE for the next CSI-RS period. [0116] In another embodiment, the network or BS shares an UL RS configuration with the repeater, e.g., SRS transmission configuration in time and frequency. The repeater then uses the same transmit beam for signal forwarding to the UE as the receive beam used for signal reception from the UE in prior slot(s) (e.g., assuming beam correspondence). [0117] In one embodiment directed to CSI-RS repeater selection, the BS configures the UE with repeater-specific reference signals to report the best repeater that may be used to serve the UE or CRI corresponding to the best repeater or CSI-RS resources received with highest RSRP/SINR or above a threshold. The BS may associate a CSI-RS resource with a particular repeater. Due to UE mobility, it may happen that the UE is no longer in the coverage of the repeater that forwarded the SSB/CSI-RS beam for that UE for connection. The BS, in one embodiment, configures multiple repeaters to forward repeater specific reference signals to UEs. In one implementation, the BS assigns SSB/CSI-RS beams to different repeaters and configures the repeaters with time and directional information to forward the SSB/CSI-RS. The UE, in one embodiment, measures the CSI-RS received from multiple repeaters and reports the CRI- RSRP/CRI-SINR/SSB-INDEX-RSRP/SSB-INDEX-SINR to the BS. Based on a predefined threshold and based on the SSB/CSI-RS with the highest RSRP (or a suitable beam above a RSRP threshold), in one embodiment, the BS assigns the repeater associated with the SSB/CSI-RS beam with the highest RSRP (or the suitable beam) to serve the reporting UE. Based on the reported RSRP, in one embodiment, the network may switch on, turn on, activate, or the like the repeater associated with the highest RSRP (or RSRP/SINR above a threshold) and switch off, turn off, deactivate, or the like, the other repeaters e.g., associated with a lower RSRP. [0118] In one embodiment, the network may configure the UE with a set of reference signals, such as CSI-RS, where one subset of CSI-RS ports is associated with one smart repeater and another subset of CSI-RS ports are associated with another smart repeater. In one implementation, the UE can be configured/pre-configured with the association of smart repeaters and corresponding CSI-RS ports. [0119] In one implementation, when the CSI-RS ports with CDM in the frequency domain needs to be applied to a smart repeater, then one smart repeater can be associated with ports on a given symbol with CDM1 (e.g., first CDM code or orthogonal code), while another smart repeater can be associated with ports on the same symbol on same REs, but with a different CDM2 (e.g., second CDM code or orthogonal code). This may effectively allow the same CSI-RS patterns from a gNB and UE perspective. Basically, in one embodiment, the same number of CSI-RS ports, such as the maximum 32 ports, can be maintained, but each smart repeater is associated with only a subset. For example, when two smart repeaters are used, then 16 ports can be associated with the first smart repeater and another 16 ports can be associated with the second smart repeater. [0120] In another implementation, the BS configures repeater RS different than the CSI- RS. The RS may be scrambled with the repeater ID (e.g., repeater ID or an ID corresponding to a repeater used in the initialization of the pseudo-random sequence generator associated with the CSI-RS sequence) and mapped to repeater specific resources. The UE, in one embodiment, is configured with the BS with the resources of these RS and indicated to measure and report the RSRP/SINR of the configured RS resources. The BS may assign the corresponding repeater with the highest RSRP (or RSRP/SINR above a threshold) RS reported from the UE. [0121] In one implementation, the BS configures the UE to report the quality of all or a subset of configured links (e.g., CSI-RS beams/repeater-specific RS). In another implementation, the UE is configured to report only the links with qualities that satisfy a predefined threshold. [0122] Figure 7 depicts a user equipment apparatus 700 that may be used for repeater configuration for channel state information reference signal, according to embodiments of the disclosure. In various embodiments, the user equipment apparatus 700 is used to implement one or more of the solutions described above. The user equipment apparatus 700 may be one embodiment of the remote unit 105 and/or the UE, described above. Furthermore, the user equipment apparatus 700 may include a processor 705, a memory 710, an input device 715, an output device 720, and a transceiver 725. [0123] In some embodiments, the input device 715 and the output device 720 are combined into a single device, such as a touchscreen. In certain embodiments, the user equipment apparatus 700 may not include any input device 715 and/or output device 720. In various embodiments, the user equipment apparatus 700 may include one or more of: the processor 705, the memory 710, and the transceiver 725, and may not include the input device 715 and/or the output device 720. [0124] As depicted, the transceiver 725 includes at least one transmitter 730 and at least one receiver 735. In some embodiments, the transceiver 725 communicates with one or more cells (or wireless coverage areas) supported by one or more base units 121. In various embodiments, the transceiver 725 is operable on unlicensed spectrum. Moreover, the transceiver 725 may include multiple UE panel supporting one or more beams. Additionally, the transceiver 725 may support at least one network interface 740 and/or application interface 745. The application interface(s) 745 may support one or more APIs. The network interface(s) 740 may support 3GPP reference points, such as Uu, N1, PC5, etc. Other network interfaces 740 may be supported, as understood by one of ordinary skill in the art. [0125] The processor 705, in one embodiment, may include any known controller capable of executing computer-readable instructions and/or capable of performing logical operations. For example, the processor 705 may be a microcontroller, a microprocessor, a central processing unit (“CPU”), a graphics processing unit (“GPU”), an auxiliary processing unit, a field programmable gate array (“FPGA”), or similar programmable controller. In some embodiments, the processor 705 executes instructions stored in the memory 710 to perform the methods and routines described herein. The processor 705 is communicatively coupled to the memory 710, the input device 715, the output device 720, and the transceiver 725. In certain embodiments, the processor 705 may include an application processor (also known as “main processor”) which manages application- domain and operating system (“OS”) functions and a baseband processor (also known as “baseband radio processor”) which manages radio functions. [0126] In various embodiments, the processor 705 and transceiver 725 control the user equipment apparatus 700 to implement the above described UE behaviors. In one embodiment, the transceiver 725 receives, from a base station of a mobile wireless communication network, an indication to report repeater-specific reference signal (“RS”) measurements associated with a repeater node and repeater-specific channel state information RS (“CSI-RS”) and transmits, to the base station, repeater-specific RS measurements associated with the received repeater-specific CSI-RS. [0127] In one embodiment, the transceiver 725 receives a configuration from the base station for reporting at least one of CSI-RS resource indicator (“CRI”) reference signal received power and CRI signal-to-noise and interference ratio associated with a symbol identifier for the base station to identify a beam to be used at the repeater node. [0128] In one embodiment, the transceiver 725 receives a configuration to report a quality of at least one configured link. In one embodiment, the transceiver 725 receives a configuration to report a quality of at least one configured link in response to the quality of the at least one configured link satisfying a predefined quality threshold. [0129] The memory 710, in one embodiment, is a computer readable storage medium. In some embodiments, the memory 710 includes volatile computer storage media. For example, the memory 710 may include a RAM, including dynamic RAM (“DRAM”), synchronous dynamic RAM (“SDRAM”), and/or static RAM (“SRAM”). In some embodiments, the memory 710 includes non-volatile computer storage media. For example, the memory 710 may include a hard disk drive, a flash memory, or any other suitable non-volatile computer storage device. In some embodiments, the memory 710 includes both volatile and non-volatile computer storage media. [0130] In some embodiments, the memory 710 stores data related to repeater configuration for channel state information reference signal. For example, the memory 710 may store various parameters, panel/beam configurations, resource assignments, policies, and the like as described above. In certain embodiments, the memory 710 also stores program code and related data, such as an operating system or other controller algorithms operating on the user equipment apparatus 700. [0131] The input device 715, in one embodiment, may include any known computer input device including a touch panel, a button, a keyboard, a stylus, a microphone, or the like. In some embodiments, the input device 715 may be integrated with the output device 720, for example, as a touchscreen or similar touch-sensitive display. In some embodiments, the input device 715 includes a touchscreen such that text may be input using a virtual keyboard displayed on the touchscreen and/or by handwriting on the touchscreen. In some embodiments, the input device 715 includes two or more different devices, such as a keyboard and a touch panel. [0132] The output device 720, in one embodiment, is designed to output visual, audible, and/or haptic signals. In some embodiments, the output device 720 includes an electronically controllable display or display device capable of outputting visual data to a user. For example, the output device 720 may include, but is not limited to, an LCD display, an LED display, an OLED display, a projector, or similar display device capable of outputting images, text, or the like to a user. As another, non-limiting, example, the output device 720 may include a wearable display separate from, but communicatively coupled to, the rest of the user equipment apparatus 700, such as a smart watch, smart glasses, a heads-up display, or the like. Further, the output device 720 may be a component of a smart phone, a personal digital assistant, a television, a table computer, a notebook (laptop) computer, a personal computer, a vehicle dashboard, or the like. [0133] In certain embodiments, the output device 720 includes one or more speakers for producing sound. For example, the output device 720 may produce an audible alert or notification (e.g., a beep or chime). In some embodiments, the output device 720 includes one or more haptic devices for producing vibrations, motion, or other haptic feedback. In some embodiments, all, or portions of the output device 720 may be integrated with the input device 715. For example, the input device 715 and output device 720 may form a touchscreen or similar touch-sensitive display. In other embodiments, the output device 720 may be located near the input device 715. [0134] The transceiver 725 communicates with one or more network functions of a mobile communication network via one or more access networks. The transceiver 725 operates under the control of the processor 705 to transmit messages, data, and other signals and also to receive messages, data, and other signals. For example, the processor 705 may selectively activate the transceiver 725 (or portions thereof) at particular times in order to send and receive messages. [0135] The transceiver 725 includes at least transmitter 730 and at least one receiver 735. One or more transmitters 730 may be used to provide UL communication signals to a base unit 121, such as the UL transmissions described herein. Similarly, one or more receivers 735 may be used to receive DL communication signals from the base unit 121, as described herein. Although only one transmitter 730 and one receiver 735 are illustrated, the user equipment apparatus 700 may have any suitable number of transmitters 730 and receivers 735. Further, the transmitter(s) 730 and the receiver(s) 735 may be any suitable type of transmitters and receivers. In one embodiment, the transceiver 725 includes a first transmitter/receiver pair used to communicate with a mobile communication network over licensed radio spectrum and a second transmitter/receiver pair used to communicate with a mobile communication network over unlicensed radio spectrum. [0136] In certain embodiments, the first transmitter/receiver pair used to communicate with a mobile communication network over licensed radio spectrum and the second transmitter/receiver pair used to communicate with a mobile communication network over unlicensed radio spectrum may be combined into a single transceiver unit, for example a single chip performing functions for use with both licensed and unlicensed radio spectrum. In some embodiments, the first transmitter/receiver pair and the second transmitter/receiver pair may share one or more hardware components. For example, certain transceivers 725, transmitters 730, and receivers 735 may be implemented as physically separate components that access a shared hardware resource and/or software resource, such as for example, the network interface 740. [0137] In various embodiments, one or more transmitters 730 and/or one or more receivers 735 may be implemented and/or integrated into a single hardware component, such as a multi- transceiver chip, a system-on-a-chip, an ASIC, or other type of hardware component. In certain embodiments, one or more transmitters 730 and/or one or more receivers 735 may be implemented and/or integrated into a multi-chip module. In some embodiments, other components such as the network interface 740 or other hardware components/circuits may be integrated with any number of transmitters 730 and/or receivers 735 into a single chip. In such embodiment, the transmitters 730 and receivers 735 may be logically configured as a transceiver 725 that uses one more common control signals or as modular transmitters 730 and receivers 735 implemented in the same hardware chip or in a multi-chip module. [0138] Figure 8 depicts a network apparatus 800 that may be used for repeater configuration for channel state information reference signal, according to embodiments of the disclosure. In one embodiment, network apparatus 800 may be one implementation of a RAN node, such as the base unit 121, the RAN node 210, or gNB, described above. Furthermore, the base network apparatus 800 may include a processor 805, a memory 810, an input device 815, an output device 820, and a transceiver 825. [0139] In some embodiments, the input device 815 and the output device 820 are combined into a single device, such as a touchscreen. In certain embodiments, the network apparatus 800 may not include any input device 815 and/or output device 820. In various embodiments, the network apparatus 800 may include one or more of: the processor 805, the memory 810, and the transceiver 825, and may not include the input device 815 and/or the output device 820. [0140] As depicted, the transceiver 825 includes at least one transmitter 830 and at least one receiver 835. Here, the transceiver 825 communicates with one or more remote units 105. Additionally, the transceiver 825 may support at least one network interface 840 and/or application interface 845. The application interface(s) 845 may support one or more APIs. The network interface(s) 840 may support 3GPP reference points, such as Uu, N1, N2 and N3. Other network interfaces 840 may be supported, as understood by one of ordinary skill in the art. [0141] The processor 805, in one embodiment, may include any known controller capable of executing computer-readable instructions and/or capable of performing logical operations. For example, the processor 805 may be a microcontroller, a microprocessor, a CPU, a GPU, an auxiliary processing unit, a FPGA, or similar programmable controller. In some embodiments, the processor 805 executes instructions stored in the memory 810 to perform the methods and routines described herein. The processor 805 is communicatively coupled to the memory 810, the input device 815, the output device 820, and the transceiver 825. In certain embodiments, the processor 805 may include an application processor (also known as “main processor”) which manages application-domain and operating system (“OS”) functions and a baseband processor (also known as “baseband radio processor”) which manages radio function. [0142] In various embodiments, the network apparatus 800 is a RAN node (e.g., gNB) that includes a processor 805 and a transceiver 825. In one embodiment, the transceiver 825 transmits an initial setup configuration to a repeater node for establishing a forwarding link with a user equipment (“UE”) device, transmits an initial access configuration to the repeater node, the initial access configuration comprising one or more configuration parameters that allow the UE to establish access to a mobile wireless communication network via the repeater node, and receives feedback from the repeater node that indicates reception of one or more of the initial setup configuration and the initial access configuration. [0143] The memory 810, in one embodiment, is a computer readable storage medium. In some embodiments, the memory 810 includes volatile computer storage media. For example, the memory 810 may include a RAM, including dynamic RAM (“DRAM”), synchronous dynamic RAM (“SDRAM”), and/or static RAM (“SRAM”). In some embodiments, the memory 810 includes non-volatile computer storage media. For example, the memory 810 may include a hard disk drive, a flash memory, or any other suitable non-volatile computer storage device. In some embodiments, the memory 810 includes both volatile and non-volatile computer storage media. [0144] In some embodiments, the memory 810 stores data related to repeater configuration for channel state information reference signal. For example, the memory 810 may store parameters, configurations, resource assignments, policies, and the like, as described above. In certain embodiments, the memory 810 also stores program code and related data, such as an operating system or other controller algorithms operating on the network apparatus 800. [0145] The input device 815, in one embodiment, may include any known computer input device including a touch panel, a button, a keyboard, a stylus, a microphone, or the like. In some embodiments, the input device 815 may be integrated with the output device 820, for example, as a touchscreen or similar touch-sensitive display. In some embodiments, the input device 815 includes a touchscreen such that text may be input using a virtual keyboard displayed on the touchscreen and/or by handwriting on the touchscreen. In some embodiments, the input device 815 includes two or more different devices, such as a keyboard and a touch panel. [0146] The output device 820, in one embodiment, is designed to output visual, audible, and/or haptic signals. In some embodiments, the output device 820 includes an electronically controllable display or display device capable of outputting visual data to a user. For example, the output device 820 may include, but is not limited to, an LCD display, an LED display, an OLED display, a projector, or similar display device capable of outputting images, text, or the like to a user. As another, non-limiting, example, the output device 820 may include a wearable display separate from, but communicatively coupled to, the rest of the network apparatus 800, such as a smart watch, smart glasses, a heads-up display, or the like. Further, the output device 820 may be a component of a smart phone, a personal digital assistant, a television, a table computer, a notebook (laptop) computer, a personal computer, a vehicle dashboard, or the like. [0147] In certain embodiments, the output device 820 includes one or more speakers for producing sound. For example, the output device 820 may produce an audible alert or notification (e.g., a beep or chime). In some embodiments, the output device 820 includes one or more haptic devices for producing vibrations, motion, or other haptic feedback. In some embodiments, all, or portions of the output device 820 may be integrated with the input device 815. For example, the input device 815 and output device 820 may form a touchscreen or similar touch-sensitive display. In other embodiments, the output device 820 may be located near the input device 815. [0148] The transceiver 825 includes at least transmitter 830 and at least one receiver 835. One or more transmitters 830 may be used to communicate with the UE, as described herein. Similarly, one or more receivers 835 may be used to communicate with network functions in the non-public network (“NPN”), PLMN and/or RAN, as described herein. Although only one transmitter 830 and one receiver 835 are illustrated, the network apparatus 800 may have any suitable number of transmitters 830 and receivers 835. Further, the transmitter(s) 830 and the receiver(s) 835 may be any suitable type of transmitters and receivers. [0149] In one embodiment, the transceiver 825 receives a first configuration from a base station of a mobile wireless communication network, the first configuration comprising channel state information reference signal (“CSI-RS”) configuration information for amplifying and forwarding CSI-RS beams to a user equipment (“UE”) device from the repeater node. [0150] In one embodiment, the transceiver 825 receives a second configuration from the base station, the second configuration comprising configuration information for performing measurement and reporting of the CSI-RS beams. In one embodiment, the transceiver 825 receives repeater-specific CSI-RS to be forwarded to the UE device and transmits the repeater-specific CSI- RS to the UE device according to the first configuration. [0151] In one embodiment, the first configuration further comprises receiving time information of a location of slots with CSI-RS and beam information for each CSI-RS symbol. In one embodiment, the beam information comprises an association of one or more antenna ports at the base station with one or more antenna ports at the repeater for each symbol such that one or more CSI-RS received from the base station are grouped for one symbol and associated with one antenna port at the repeater. [0152] In one embodiment, in response to identifying that the UE device is connected to the base station through the repeater node, the first configuration is limited to a time domain and the repeater node is configured with time and beam information such that CSI-RS resource elements (“REs”) for different ports are mapped to different orthogonal frequency-division multiplexing (“OFDM”) symbols. [0153] In one embodiment, the transceiver 825 receives an indication from the base station to apply beam refinement on a single CSI-RS port beam, wherein a different beam configuration is applied for each of multiple symbols that are received on the single CSI-RS port beam from the base station. [0154] In one embodiment, the transceiver 825 receives different CSI-RS resources from the base station using a same spatial filter, the different CSI-RS resources receiving in different symbols, and transmits CSI-RS corresponding to the different CSI-RS resources using different beams. [0155] In one embodiment, the transceiver 825 receives, from the base station, a CSI-RS resource set configuration and an indication for reporting CSI measurements for beam refinement for a link between the base station and the repeater node. [0156] In one embodiment, the transceiver 825 receives an uplink (“UL”) RS configuration from the base station for transmitting and receiving, on a same beam, signals from the UE device in a prior slot. [0157] In one embodiment, the transceiver 825 transmits a first configuration to a repeater node of a mobile wireless communication network, the first configuration comprising channel state information reference signal (“CSI-RS”) configuration information for amplifying and forwarding CSI-RS beams to a user equipment (“UE”) device from the repeater node. [0158] In one embodiment, the transceiver 825 transmits a second configuration to the repeater node, the second configuration comprising configuration information for performing measurement and reporting of the CSI-RS beams. In one embodiment, the transceiver 825 transmits repeater-specific CSI-RS to the repeater node to be forwarded to the UE device and transmits an indication to the UE device to report repeater-specific CSI-RS measurements to the base station. [0159] In one embodiment, the first configuration further comprises receiving time information of a location of slots with CSI-RS and beam information for each CSI-RS symbol. In one embodiment, the beam information comprises an association of one or more antenna ports at the base station with one or more antenna ports at the repeater for each symbol such that one or more CSI-RS received from the base station are grouped for one symbol and associated with one antenna port at the repeater. [0160] In one embodiment, the second apparatus includes a processor that, in response to identifying that the UE device is connected to the base station through the repeater node, limits the first configuration to a time domain and configures the repeater node with time and beam information such that CSI-RS resource elements (“REs”) for different ports are mapped to different orthogonal frequency-division multiplexing (“OFDM”) symbols. [0161] In one embodiment, the transceiver 825 transmits an indication to the repeater node to apply beam refinement on a single CSI-RS port beam, wherein a different beam configuration is applied for each of multiple symbols that are received on the single CSI-RS port beam from the base station. [0162] In one embodiment, the processor 805 configures the UE device to report at least one of CSI-RS resource indicator (“CRI”) reference signal received power and CRI signal-to-noise and interference ratio associated with a symbol identifier for the base station to identify a beam to be used at the repeater node. [0163] In one embodiment, the processor 805 configures the repeater node to receive different CSI-RS resources using a same spatial filter, wherein the different CSI-RS resources are transmitted in different symbols using different beams. [0164] In one embodiment, the processor 805 configures the repeater node with a CSI-RS resource set configuration and an indication for reporting CSI measurements for beam refinement for a link between the base station and the repeater node, compares CSI measurements reported from the repeater node and the UE device, and at least one of selects a beam for each link between the base station, the UE, and the repeater node, and associates beams of links between the base station, the UE, and the repeater node. [0165] In one embodiment, the transceiver 825 transmits to the repeater node an uplink (“UL”) RS configuration from the base station for transmitting and receiving, on a same beam, signals from the UE device in a prior slot. In one embodiment, the transceiver 825 configures different repeaters to forward repeater-specific RS to the UE device. [0166] In one embodiment, the processor 805 assigns CSI-RS beams to the different repeaters and configuring the different repeaters with time and directional information to forward the CSI-RS to the UE device. In one embodiment, the processor 805 associates one of the different repeaters with ports on a given symbol with one code division multiplexing (“CDM”) and associating another one of the different repeaters with ports on a same symbol but with a different CDM in response to determining that the CSI-RS ports with CDM in a frequency domain should be applied. [0167] In one embodiment, the processor 805 configures the UE device to report measurements of repeater-specific RS to the base station ad selects a repeater of the different repeaters that can serve the UE device for data transmission. [0168] In one embodiment, the processor 805 configures the UE device to report a quality of at least one configured link between the UE and a repeater node. In one embodiment, the processor 805 configures the UE device to report a quality of at least one configured link in response to the quality of the at least one configured link satisfying a predefined quality threshold. [0169] Figure 9 is a flowchart diagram of a method 900 for repeater configuration for channel state information reference signal. The method 900 may be performed by a repeater node such as a network equipment apparatus 800. In some embodiments, the method 900 may be performed by a processor executing program code, for example, a microcontroller, a microprocessor, a CPU, a GPU, an auxiliary processing unit, a FPGA, or the like. [0170] In one embodiment, the method 900 includes receiving 905 a first configuration from a base station of a mobile wireless communication network, the first configuration comprising channel state information reference signal (“CSI-RS”) configuration information for amplifying and forwarding CSI-RS beams to a user equipment (“UE”) device from the repeater node. In one embodiment, the method 900 includes receiving 910 a second configuration from the base station, the second configuration comprising configuration information for performing measurement and reporting of the CSI-RS beams. [0171] In one embodiment, the method 900 includes receiving 915 repeater-specific CSI- RS to be forwarded to the UE device. In one embodiment, the method 900 includes transmitting 920 the repeater-specific CSI-RS to the UE device according to the first configuration, and the method 900 ends. [0172] Figure 10 is a flowchart diagram of a method 1000 for repeater configuration for channel state information reference signal. The method 1000 may be performed by a network entity such as a base node, a gNB, and/or the network equipment apparatus 800. In some embodiments, the method 1000 may be performed by a processor executing program code, for example, a microcontroller, a microprocessor, a CPU, a GPU, an auxiliary processing unit, a FPGA, or the like. [0173] In one embodiment, the method 1000 includes transmitting 1005 a first configuration to a repeater node of a mobile wireless communication network, the first configuration comprising channel state information reference signal (“CSI-RS”) configuration information for amplifying and forwarding CSI-RS beams to a user equipment (“UE”) device from the repeater node. In one embodiment, the method 1000 includes transmitting 1010 a second configuration to the repeater node, the second configuration comprising configuration information for performing measurement and reporting of the CSI-RS beams. [0174] In one embodiment, the method 1000 includes transmitting 1015 repeater-specific CSI-RS to the repeater node to be forwarded to the UE device. In one embodiment, the method 1000 includes transmitting 1020 an indication to the UE device to report repeater-specific CSI-RS measurements to the base station, and the method 1000 ends. [0175] Figure 11 is a flowchart diagram of a method 1100 for repeater configuration for channel state information reference signal. The method 1100 may be performed by a user equipment apparatus 700 such as remote unit 105. In some embodiments, the method 1100 may be performed by a processor executing program code, for example, a microcontroller, a microprocessor, a CPU, a GPU, an auxiliary processing unit, a FPGA, or the like. [0176] In one embodiment, the method 1100 includes receiving 1105, from a base station of a mobile wireless communication network, an indication to report repeater-specific reference signal (“RS”) measurements associated with a repeater node and repeater-specific channel state information RS (“CSI-RS”). In one embodiment, the method 1100 includes transmitting 1110, to the base station, repeater-specific RS measurements associated with the received repeater-specific CSI-RS, and the method 1100 ends. [0177] A first apparatus is disclosed for repeater configuration for channel state information reference signal. The first apparatus may include a repeater node such as a network equipment apparatus 800. In some embodiments, the first apparatus includes a processor executing program code, for example, a microcontroller, a microprocessor, a CPU, a GPU, an auxiliary processing unit, a FPGA, or the like. [0178] In one embodiment, the first apparatus includes a transceiver that receives a first configuration from a base station of a mobile wireless communication network, the first configuration comprising channel state information reference signal (“CSI-RS”) configuration information for amplifying and forwarding CSI-RS beams to a user equipment (“UE”) device from the repeater node. [0179] In one embodiment, the transceiver receives a second configuration from the base station, the second configuration comprising configuration information for performing measurement and reporting of the CSI-RS beams. In one embodiment, the transceiver receives repeater-specific CSI-RS to be forwarded to the UE device and transmits the repeater-specific CSI- RS to the UE device according to the first configuration. [0180] In one embodiment, the first configuration further comprises receiving time information of a location of slots with CSI-RS and beam information for each CSI-RS symbol. In one embodiment, the beam information comprises an association of one or more antenna ports at the base station with one or more antenna ports at the repeater for each symbol such that one or more CSI-RS received from the base station are grouped for one symbol and associated with one antenna port at the repeater. [0181] In one embodiment, in response to identifying that the UE device is connected to the base station through the repeater node, the first configuration is limited to a time domain and the repeater node is configured with time and beam information such that CSI-RS resource elements (“REs”) for different ports are mapped to different orthogonal frequency-division multiplexing (“OFDM”) symbols. [0182] In one embodiment, the transceiver receives an indication from the base station to apply beam refinement on a single CSI-RS port beam, wherein a different beam configuration is applied for each of multiple symbols that are received on the single CSI-RS port beam from the base station. [0183] In one embodiment, the transceiver receives different CSI-RS resources from the base station using a same spatial filter, the different CSI-RS resources receiving in different symbols, and transmits CSI-RS corresponding to the different CSI-RS resources using different beams. [0184] In one embodiment, the transceiver receives, from the base station, a CSI-RS resource set configuration and an indication for reporting CSI measurements for beam refinement for a link between the base station and the repeater node. [0185] In one embodiment, the transceiver receives an uplink (“UL”) RS configuration from the base station for transmitting and receiving, on a same beam, signals from the UE device in a prior slot. [0186] A first method is disclosed for repeater configuration for channel state information reference signal. The first method may be performed by a repeater node such as a network equipment apparatus 800. In some embodiments, the fist method may be performed by a processor executing program code, for example, a microcontroller, a microprocessor, a CPU, a GPU, an auxiliary processing unit, a FPGA, or the like. [0187] In one embodiment, the first method includes receiving a first configuration from a base station of a mobile wireless communication network, the first configuration comprising channel state information reference signal (“CSI-RS”) configuration information for amplifying and forwarding CSI-RS beams to a user equipment (“UE”) device from the repeater node. [0188] In one embodiment, the first method includes receiving a second configuration from the base station, the second configuration comprising configuration information for performing measurement and reporting of the CSI-RS beams. In one embodiment, the first method includes receiving repeater-specific CSI-RS to be forwarded to the UE device and transmits the repeater-specific CSI-RS to the UE device according to the first configuration. [0189] In one embodiment, the first configuration further comprises receiving time information of a location of slots with CSI-RS and beam information for each CSI-RS symbol. In one embodiment, the beam information comprises an association of one or more antenna ports at the base station with one or more antenna ports at the repeater for each symbol such that one or more CSI-RS received from the base station are grouped for one symbol and associated with one antenna port at the repeater. [0190] In one embodiment, in response to identifying that the UE device is connected to the base station through the repeater node, the first method includes limiting the first configuration to a time domain and the repeater node is configured with time and beam information such that CSI-RS resource elements (“REs”) for different ports are mapped to different orthogonal frequency-division multiplexing (“OFDM”) symbols. [0191] In one embodiment, the first method includes receiving an indication from the base station to apply beam refinement on a single CSI-RS port beam, wherein a different beam configuration is applied for each of multiple symbols that are received on the single CSI-RS port beam from the base station. [0192] In one embodiment, the first method includes receiving different CSI-RS resources from the base station using a same spatial filter, the different CSI-RS resources receiving in different symbols, and transmitting CSI-RS corresponding to the different CSI-RS resources using different beams. [0193] In one embodiment, the first method includes receiving, from the base station, a CSI-RS resource set configuration and an indication for reporting CSI measurements for beam refinement for a link between the base station and the repeater node. [0194] In one embodiment, the first method includes receiving an uplink (“UL”) RS configuration from the base station for transmitting and receiving, on a same beam, signals from the UE device in a prior slot. [0195] A second apparatus is disclosed for repeater configuration for channel state information reference signal. The second apparatus may include a network entity such as a base node, a gNB, and/or the network equipment apparatus 800. In some embodiments, the second apparatus includes a processor executing program code, for example, a microcontroller, a microprocessor, a CPU, a GPU, an auxiliary processing unit, a FPGA, or the like. [0196] In one embodiment, the second apparatus includes a transceiver that transmits a first configuration to a repeater node of a mobile wireless communication network, the first configuration comprising channel state information reference signal (“CSI-RS”) configuration information for amplifying and forwarding CSI-RS beams to a user equipment (“UE”) device from the repeater node. [0197] In one embodiment, the transceiver transmits a second configuration to the repeater node, the second configuration comprising configuration information for performing measurement and reporting of the CSI-RS beams. In one embodiment, the transceiver transmits repeater-specific CSI-RS to the repeater node to be forwarded to the UE device and transmits an indication to the UE device to report repeater-specific CSI-RS measurements to the base station. [0198] In one embodiment, the first configuration further comprises receiving time information of a location of slots with CSI-RS and beam information for each CSI-RS symbol. In one embodiment, the beam information comprises an association of one or more antenna ports at the base station with one or more antenna ports at the repeater for each symbol such that one or more CSI-RS received from the base station are grouped for one symbol and associated with one antenna port at the repeater. [0199] In one embodiment, the second apparatus includes a processor that, in response to identifying that the UE device is connected to the base station through the repeater node, limits the first configuration to a time domain and configures the repeater node with time and beam information such that CSI-RS resource elements (“REs”) for different ports are mapped to different orthogonal frequency-division multiplexing (“OFDM”) symbols. [0200] In one embodiment, the transceiver transmits an indication to the repeater node to apply beam refinement on a single CSI-RS port beam, wherein a different beam configuration is applied for each of multiple symbols that are received on the single CSI-RS port beam from the base station. [0201] In one embodiment, the processor configures the UE device to report at least one of CSI-RS resource indicator (“CRI”) reference signal received power and CRI signal-to-noise and interference ratio associated with a symbol identifier for the base station to identify a beam to be used at the repeater node. [0202] In one embodiment, the processor configures the repeater node to receive different CSI-RS resources using a same spatial filter, wherein the different CSI-RS resources are transmitted in different symbols using different beams. [0203] In one embodiment, the processor configures the repeater node with a CSI-RS resource set configuration and an indication for reporting CSI measurements for beam refinement for a link between the base station and the repeater node, compares CSI measurements reported from the repeater node and the UE device, and at least one of selects a beam for each link between the base station, the UE, and the repeater node, and associates beams of links between the base station, the UE, and the repeater node. [0204] In one embodiment, the transceiver transmits to the repeater node an uplink (“UL”) RS configuration from the base station for transmitting and receiving, on a same beam, signals from the UE device in a prior slot. In one embodiment, the transceiver configures different repeaters to forward repeater-specific RS to the UE device. [0205] In one embodiment, the processor assigns CSI-RS beams to the different repeaters and configuring the different repeaters with time and directional information to forward the CSI- RS to the UE device. In one embodiment, the processor associates one of the different repeaters with ports on a given symbol with one code division multiplexing (“CDM”) and associating another one of the different repeaters with ports on a same symbol but with a different CDM in response to determining that the CSI-RS ports with CDM in a frequency domain should be applied. [0206] In one embodiment, the processor configures the UE device to report measurements of repeater-specific RS to the base station ad selects a repeater of the different repeaters that can serve the UE device for data transmission. [0207] In one embodiment, the processor configures the UE device to report a quality of at least one configured link between the UE and a repeater node. In one embodiment, the processor configures the UE device to report a quality of at least one configured link in response to the quality of the at least one configured link satisfying a predefined quality threshold. [0208] A second method is disclosed for repeater configuration for channel state information reference signal. The second method may be performed by a network entity such as a base node, a gNB, and/or the network equipment apparatus 800. In some embodiments, the second method may be performed by a processor executing program code, for example, a microcontroller, a microprocessor, a CPU, a GPU, an auxiliary processing unit, a FPGA, or the like. [0209] In one embodiment, the second method includes transmitting a first configuration to a repeater node of a mobile wireless communication network, the first configuration comprising channel state information reference signal (“CSI-RS”) configuration information for amplifying and forwarding CSI-RS beams to a user equipment (“UE”) device from the repeater node. [0210] In one embodiment, the second method includes transmitting a second configuration to the repeater node, the second configuration comprising configuration information for performing measurement and reporting of the CSI-RS beams. In one embodiment, the second method includes transmitting repeater-specific CSI-RS to the repeater node to be forwarded to the UE device and transmitting an indication to the UE device to report repeater-specific CSI-RS measurements to the base station. [0211] In one embodiment, the first configuration further comprises receiving time information of a location of slots with CSI-RS and beam information for each CSI-RS symbol. In one embodiment, the beam information comprises an association of one or more antenna ports at the base station with one or more antenna ports at the repeater for each symbol such that one or more CSI-RS received from the base station are grouped for one symbol and associated with one antenna port at the repeater. [0212] In one embodiment, the second method includes, in response to identifying that the UE device is connected to the base station through the repeater node, limiting the first configuration to a time domain and configuring the repeater node with time and beam information such that CSI-RS resource elements (“REs”) for different ports are mapped to different orthogonal frequency-division multiplexing (“OFDM”) symbols. [0213] In one embodiment, the second method includes transmitting an indication to the repeater node to apply beam refinement on a single CSI-RS port beam, wherein a different beam configuration is applied for each of multiple symbols that are received on the single CSI-RS port beam from the base station. [0214] In one embodiment, the second method includes configuring the UE device to report at least one of CSI-RS resource indicator (“CRI”) reference signal received power and CRI signal-to-noise and interference ratio associated with a symbol identifier for the base station to identify a beam to be used at the repeater node. [0215] In one embodiment, the second method includes configuring the repeater node to receive different CSI-RS resources using a same spatial filter, wherein the different CSI-RS resources are transmitted in different symbols using different beams. [0216] In one embodiment, the second method includes configuring the repeater node with a CSI-RS resource set configuration and an indication for reporting CSI measurements for beam refinement for a link between the base station and the repeater node, compares CSI measurements reported from the repeater node and the UE device, and at least one of selects a beam for each link between the base station, the UE, and the repeater node, and associates beams of links between the base station, the UE, and the repeater node. [0217] In one embodiment, the second method includes transmitting to the repeater node an uplink (“UL”) RS configuration from the base station for transmitting and receiving, on a same beam, signals from the UE device in a prior slot. In one embodiment, the second method includes configuring different repeaters to forward repeater-specific RS to the UE device. [0218] In one embodiment, the second method includes assigning CSI-RS beams to the different repeaters and configuring the different repeaters with time and directional information to forward the CSI-RS to the UE device. In one embodiment, the second method includes associating one of the different repeaters with ports on a given symbol with one code division multiplexing (“CDM”) and associating another one of the different repeaters with ports on a same symbol but with a different CDM in response to determining that the CSI-RS ports with CDM in a frequency domain should be applied. [0219] In one embodiment, the second method includes configuring the UE device to report measurements of repeater-specific RS to the base station ad selects a repeater of the different repeaters that can serve the UE device for data transmission. [0220] In one embodiment, the second method includes configuring the UE device to report a quality of at least one configured link between the UE and a repeater node. In one embodiment the second method includes configuring the UE device to report a quality of at least one configured link in response to the quality of the at least one configured link satisfying a predefined quality threshold. [0221] A third apparatus is disclosed for repeater configuration for channel state information reference signal. The third apparatus may include a user equipment apparatus 700 such as remote unit 105. In some embodiments, the third apparatus may be performed by a processor executing program code, for example, a microcontroller, a microprocessor, a CPU, a GPU, an auxiliary processing unit, a FPGA, or the like. [0222] In one embodiment, the third apparatus includes a transceiver that receives, from a base station of a mobile wireless communication network, an indication to report repeater-specific reference signal (“RS”) measurements associated with a repeater node and repeater-specific channel state information RS (“CSI-RS”) and transmits, to the base station, repeater-specific RS measurements associated with the received repeater-specific CSI-RS. [0223] In one embodiment, the transceiver receives a configuration from the base station for reporting at least one of CSI-RS resource indicator (“CRI”) reference signal received power and CRI signal-to-noise and interference ratio associated with a symbol identifier for the base station to identify a beam to be used at the repeater node. [0224] In one embodiment, the transceiver receives a configuration to report a quality of at least one configured link. In one embodiment, the transceiver receives a configuration to report a quality of at least one configured link in response to the quality of the at least one configured link satisfying a predefined quality threshold. [0225] A third method is disclosed for repeater configuration for channel state information reference signal. The third method may be performed by a user equipment apparatus 700 such as remote unit 105. In some embodiments, the third method may be performed by a processor executing program code, for example, a microcontroller, a microprocessor, a CPU, a GPU, an auxiliary processing unit, a FPGA, or the like. [0226] In one embodiment, the third method includes receiving, from a base station of a mobile wireless communication network, an indication to report repeater-specific reference signal (“RS”) measurements associated with a repeater node and repeater-specific channel state information RS (“CSI-RS”) and transmits, to the base station, repeater-specific RS measurements associated with the received repeater-specific CSI-RS. [0227] In one embodiment, the third method includes receiving a configuration from the base station for reporting at least one of CSI-RS resource indicator (“CRI”) reference signal received power and CRI signal-to-noise and interference ratio associated with a symbol identifier for the base station to identify a beam to be used at the repeater node. [0228] In one embodiment, the third method includes receiving a configuration to report a quality of at least one configured link. In one embodiment, the third method includes receiving a configuration to report a quality of at least one configured link in response to the quality of the at least one configured link satisfying a predefined quality threshold. [0229] Embodiments may be practiced in other specific forms. The described embodiments are to be considered in all respects only as illustrative and not restrictive. The scope of the invention is, therefore, indicated by the appended claims rather than by the foregoing description. All changes which come within the meaning and range of equivalency of the claims are to be embraced within their scope.
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