Sidelink feedback for multiple transmission-reception points

Abstract

Various aspects of the disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) can receive a plurality of sidelink transmissions associated with a spatial division multiplexing (SDM) configuration. The UE can fail to decode at least one of the plurality of sidelink transmissions. The UE can transmit feedback indicating the failure to decode the at least one sidelink transmission, wherein the feedback includes an indication of at least one layer of the SDM configuration associated with the at least one sidelink transmission. Numerous other aspects are described.

Description

Technical Field

[0001] Various aspects of this disclosure generally relate to wireless communications and techniques and apparatus for side link feedback for multiple transmit-receive points (TRPs). Background Technology

[0002] Wireless communication systems are widely deployed to provide a variety of telecommunications services such as telephone, video, data, messaging, and broadcasting. Typical wireless communication systems employ multiple access technologies that can support communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power). Examples of such multiple access technologies include Code Division Multiple Access (CDMA) systems, Time Division Multiple Access (TDMA) systems, Frequency Division Multiple Access (FDMA) systems, Orthogonal Frequency Division Multiple Access (OFDMA) systems, Single Carrier Frequency Division Multiple Access (SC-FDMA) systems, Time Division Synchronous Code Division Multiple Access (TD-SCDMA) systems, and Long Term Evolution (LTE). LTE / improved LTE is an enhanced set of the Universal Mobile Telecommunications System (UMTS) mobile standard released by the 3rd Generation Partnership Project (3GPP).

[0003] A wireless network may include multiple base stations (BSs) capable of supporting communication for multiple user equipments (UEs). UEs can communicate with the BS via downlinks and uplinks. A downlink (or forward link) refers to the communication link from the BS to the UE, and an uplink (or reverse link) refers to the communication link from the UE to the BS. As will be described in more detail herein, a BS may be referred to as a Node B, gNB, Access Point (AP), Radio Headend, Transmit / Receive Point (TRP), New Radio (NR) BS, 5G Node B, etc.

[0004] The above multiple access technologies have been adopted in various telecommunications standards to provide a common protocol enabling different user equipment to communicate at the city, country, region, and even global levels. NR (which can also be referred to as 5G) is an enhancement set of the LTE mobile standard released by 3GPP. NR is designed to better integrate with other open standards by improving spectrum efficiency, reducing costs, improving service, utilizing new spectrum, and using Orthogonal Frequency Division Multiplexing (OFDM) with Cyclic Prefix (CP) on the downlink (DL) and CP-OFDM and / or SC-FDM (e.g., also known as Discrete Fourier Transform Spread Spectrum OFDM (DFT-s-OFDM)) on the uplink (UL), as well as supporting beamforming, multiple-input multiple-output (MIMO) antenna technologies and carrier aggregation, thereby better supporting mobile broadband internet access. As the demand for mobile broadband access continues to grow, further improvements to LTE, NR, and other radio access technologies remain useful. Summary of the Invention

[0005] In some aspects, a method of wireless communication performed by a user equipment (UE) includes: receiving a plurality of sidelink transmissions associated with a spatial division multiplexing (SDM) configuration, the SDM configuration indicating how the plurality of sidelink transmissions will be multiplexed spatially; failing to decode at least one of the plurality of sidelink transmissions; and sending feedback indicating failure to decode at least one sidelink transmission, wherein the feedback includes an indication of at least one layer of the SDM configuration associated with at least one sidelink transmission.

[0006] In some aspects, a method of wireless communication performed by a first UE includes: transmitting to a second UE a plurality of sidelink transmissions associated with an SDM configuration, the SDM configuration indicating how the plurality of sidelink transmissions will be spatially multiplexed; receiving feedback indicating failure to decode at least one of the plurality of sidelink transmissions, wherein the feedback includes an indication of at least one layer of the SDM configuration associated with the at least one sidelink transmission; and selectively retransmitting at least one sidelink transmission based at least in part on the feedback.

[0007] In some aspects, a UE for wireless communication includes: a memory; and one or more processors operatively coupled to the memory, the memory and the one or more processors being configured to: receive a plurality of sidelink transmissions associated with an SDM configuration, the SDM configuration indicating how the plurality of sidelink transmissions will be spatially multiplexed; fail to decode at least one of the plurality of sidelink transmissions; and transmit feedback indicating failure to decode at least one sidelink transmission, wherein the feedback includes an indication of at least one layer of the SDM configuration associated with at least one sidelink transmission.

[0008] In some aspects, a first UE for wireless communication includes: a memory; and one or more processors operatively coupled to the memory, the memory and the one or more processors being configured to: transmit to a second UE a plurality of sidelink transmissions associated with an SDM configuration, the SDM configuration indicating how the plurality of sidelink transmissions will be spatially multiplexed; receive feedback indicating failure to decode at least one of the plurality of sidelink transmissions, wherein the feedback includes an indication of at least one layer of the SDM configuration associated with at least one sidelink transmission; and selectively retransmit at least one sidelink transmission based at least in part on the feedback.

[0009] In some aspects, a non-transitory computer-readable medium storing a set of instructions for wireless communication includes one or more instructions that, when executed by one or more processors of a UE, cause the UE to: receive a plurality of sidelink transmissions associated with an SDM configuration, the SDM configuration indicating how the plurality of sidelink transmissions will be multiplexed spatially; fail to decode at least one of the plurality of sidelink transmissions; and send feedback indicating failure to decode at least one sidelink transmission, wherein the feedback includes an indication of at least one layer of the SDM configuration associated with at least one sidelink transmission.

[0010] In some aspects, a non-transitory computer-readable medium storing a set of instructions for wireless communication includes one or more instructions that, when executed by one or more processors of a first UE, cause the first UE to: transmit to a second UE a plurality of sidelink transmissions associated with an SDM configuration, the SDM configuration indicating how the plurality of sidelink transmissions will be spatially multiplexed; receive feedback indicating failure to decode at least one of the plurality of sidelink transmissions, wherein the feedback includes an indication of at least one layer of the SDM configuration associated with at least one sidelink transmission; and selectively retransmit at least one sidelink transmission based at least in part on the feedback.

[0011] In some aspects, an apparatus for wireless communication includes: a unit for receiving a plurality of sidelink transmissions associated with an SDM configuration, the SDM configuration indicating how the plurality of sidelink transmissions will be spatially multiplexed; a unit for failing to decode at least one of the plurality of sidelink transmissions; and a unit for transmitting feedback indicating failure to decode at least one sidelink transmission, wherein the feedback includes an indication of at least one layer of the SDM configuration associated with at least one sidelink transmission.

[0012] In some aspects, an apparatus for wireless communication includes: a unit for transmitting to a UE a plurality of sidelink transmissions associated with an SDM configuration, the SDM configuration indicating how the plurality of sidelink transmissions will be spatially multiplexed; a unit for receiving feedback indicating failure to decode at least one of the plurality of sidelink transmissions, wherein the feedback includes an indication of at least one layer of the SDM configuration associated with the at least one sidelink transmission; and a unit for selectively retransmitting at least one sidelink transmission based at least in part on the feedback.

[0013] Aspects generally include methods, apparatus, systems, computer program products, non-transitory computer-readable media, user equipment, base stations, wireless communication equipment and / or processing systems as fully described herein with reference to the accompanying drawings and as illustrated by the drawings.

[0014] The features and technical advantages of the examples according to this disclosure have been outlined rather broadly above to provide a better understanding of the specific embodiments described below. Additional features and advantages will be described below. The disclosed concepts and specific examples can be readily used as the basis for modifying or designing other structures for achieving the same purpose as this disclosure. Such equivalent constructions do not depart from the scope of the appended claims. The characteristics (both their organization and operation) of the concepts disclosed herein, as well as their associated advantages, will be better understood from the following description when considered in conjunction with the accompanying drawings. Each drawing in the accompanying drawings is provided for illustrative and descriptive purposes and is not intended to limit the scope of the claims. Attached Figure Description

[0015] To gain a full understanding of the foregoing features of this disclosure, a more specific description of the invention, briefly outlined above, can be obtained by referring to various aspects, some of which are illustrated in the accompanying drawings. However, it should be noted that the drawings illustrate only certain typical aspects of this disclosure and are therefore not intended to limit its scope, as the specification may acknowledge other equally valid aspects. The same reference numerals in different drawings may identify the same or similar elements.

[0016] Figure 1 This is a diagram illustrating an example of a wireless network.

[0017] Figure 2 This is a diagram illustrating an example of communication between a base station and a UE in a wireless network according to various aspects of this disclosure.

[0018] Figure 3 This is a diagram illustrating an example of sidelink communication according to various aspects of this disclosure.

[0019] Figure 4 This is a diagram illustrating examples of sidelink communication and access link communication according to various aspects of this disclosure.

[0020] Figure 5 This is a diagram illustrating an example of multiple transmit-receive point (multiple TRP) communication according to various aspects of this disclosure.

[0021] Figure 6 This is a diagram illustrating an example of signaling associated with feedback for multiple sidelink transmissions that are spatially multiplexed, according to various aspects of this disclosure.

[0022] Figure 7 This is a diagram illustrating a structure 700 for feedback regarding multiple side link transmissions associated with a spatial division multiplexing (SDM) configuration, according to various aspects of this disclosure.

[0023] Figure 8 and 9 This is a diagram illustrating, for example, an example process performed by a UE according to various aspects of this disclosure.

[0024] Figure 10 and 11 This is a block diagram of an example device for wireless communication according to various aspects of this disclosure. Detailed Implementation

[0025] The various aspects of this disclosure are described more fully below with reference to the accompanying drawings. However, this disclosure may be embodied in many different forms and should not be construed as limited to any particular structure or function presented throughout this disclosure. Rather, these aspects are provided so that this disclosure will be thorough and complete, and will fully convey the scope of this disclosure to those skilled in the art. Based on the teachings herein, those skilled in the art will understand that the scope of this disclosure is intended to cover any aspect of the disclosure made herein, whether implemented independently of or in combination with any other aspect of this disclosure. For example, an apparatus or a method may be implemented using any number of the aspects set forth herein. Furthermore, the scope of this disclosure is intended to cover such apparatuses or methods implemented using structures, functions, or structures and functions other than or different from the aspects of the disclosure set forth herein. It should be understood that any aspect of the disclosure made herein may be embodied by one or more elements of the claims.

[0026] Several aspects of a telecommunications system will now be described with reference to various devices and techniques. These devices and techniques will be described in the following detailed embodiments and illustrated in the accompanying drawings through various frames, modules, components, circuits, steps, processes, algorithms, etc. (collectively referred to as “elements”). These elements can be implemented using hardware, software, or a combination thereof. Whether such an element is implemented as hardware or software depends on the specific application and the design constraints imposed on the entire system.

[0027] It should be noted that although terms commonly associated with 5G or NR radio access technology (RAT) may be used in this document to describe aspects, aspects of this disclosure may be applied to other RATs, such as 3G RAT, 4G RAT and / or RATs after 5G (e.g., 6G).

[0028] Figure 1This diagram illustrates an example of a wireless network 100. Wireless network 100 may be or may include a 5G (NR) network and / or an LTE network, etc. Wireless network 100 may include multiple base stations 110 (shown as BS 110a, BS 110b, BS 110c, and BS 110d) and other network entities. A base station (BS) is an entity that communicates with a user equipment (UE) and may also be referred to as an NR BS, Node B, gNB, 5G Node B (NB), access point, Transmit / Receive Point (TRP), etc. Each BS can provide communication coverage for a specific geographic area. In 3GPP, the term "cell" can refer to the coverage area of ​​a BS and / or the BS subsystem serving that coverage area, depending on the context in which the term is used.

[0029] A BS can provide communication coverage for macrocells, picocells, femtocells, and / or another type of cell. A macrocell can cover a relatively large geographic area (e.g., a radius of several kilometers) and can allow unrestricted access by UEs with service subscriptions. A picocell can cover a relatively small geographic area and can allow unrestricted access by UEs with service subscriptions. A femtocell can cover a relatively small geographic area (e.g., a residential area) and can allow restricted access by UEs associated with that femtocell (e.g., UEs in a Closed User Group (CSG)). A BS used for macrocells can be referred to as a macro BS. A BS used for picocells can be referred to as a pico BS. A BS used for femtocells can be referred to as a femtocell BS or a home BS. Figure 1 In the examples shown, BS 110a can be a macro BS for macro cell 102a, BS 110b can be a pico BS for pico cell 102b, and BS 110c can be a femto BS for femto cell 102c. A BS can support one or more (e.g., three) cells. The terms “eNB,” “base station,” “NR BS,” “gNB,” “TRP,” “AP,” “Node B,” “5G NB,” and “cell” are used interchangeably herein.

[0030] In some respects, the cell may not be stationary, and the geographical area of ​​the cell may move depending on the location of the mobile BS. In some respects, BSs may interconnect with each other and / or interconnect to one or more other BSs or network nodes (not shown) in the wireless network 100 using any suitable transport network through various types of backhaul interfaces (such as direct physical connections or virtual networks).

[0031] The wireless network 100 may also include a relay station. A relay station is an entity that can receive data transmissions from an upstream station (e.g., a BS or a UE) and transmit the data transmissions to a downstream station (e.g., a UE or a BS). A relay station can also be a UE capable of relaying transmissions to other UEs. Figure 1 In the example shown, relay BS 110d can communicate with macro BS 110a and UE 120d to facilitate communication between BS 110a and UE 120d. A relay BS can also be referred to as a relay station, relay base station, repeater, etc.

[0032] Wireless network 100 can be a heterogeneous network comprising different types of Base Stations (BSs) (e.g., macro BSs, pico BSs, femto BSs, repeater BSs, etc.). These different types of BSs can have different transmit power levels, different coverage areas, and different effects on interference in wireless network 100. For example, macro BSs can have high transmit power levels (e.g., 5 to 40 watts), while pico BSs, femto BSs, and repeater BSs can have lower transmit power levels (e.g., 0.1 to 2 watts).

[0033] Network controller 130 can be coupled to a group of base stations (BSs) and can provide coordination and control for these BSs. Network controller 130 can communicate with the BSs via backhaul. BSs can also communicate with each other directly or indirectly via wireless or wired backhaul.

[0034] UE 120 (e.g., 120a, 120b, 120c) may be distributed throughout the wireless network 100, and each UE may be stationary or mobile. UE may also be referred to as an access terminal, terminal, mobile station, user unit, station, etc. UE may be a cellular phone (e.g., a smartphone), personal digital assistant (PDA), wireless modem, wireless communication device, handheld device, laptop computer, cordless phone, wireless local loop (WLL) station, tablet device, camera, gaming device, netbook, smartbook, ultrabook, medical device or apparatus, biometric sensor / device, wearable device (smartwatch, smart clothing, smart glasses, smart wristband, smart jewelry (e.g., smart ring, smart bracelet, etc.)), entertainment device (e.g., music or video device, or satellite radio unit, etc.), vehicle component or sensor, smart meter / sensor, industrial manufacturing equipment, GPS device, or any other suitable device configured to communicate via wireless or wired media.

[0035] Some UEs can be considered Machine-Type Communication (MTC) or Evolved or Enhanced Machine-Type Communication (eMTC) UEs. MTC and eMTC UEs include, for example, robots, drones, remote devices, sensors, meters, monitors, and / or location tags, which can communicate with a base station, another device (e.g., a remote device), or some other entity. Wireless nodes can provide connectivity to or to a network (e.g., a wide area network such as the Internet or a cellular network) via wired or wireless communication links, for example. Some UEs can be considered Internet of Things (IoT) devices, and / or can be implemented as NB-IoT (Narrowband Internet of Things) devices. Some UEs can be considered Customer Premises Equipment (CPE). UE 120 can be included within a housing that houses the components of UE 120 (e.g., processor components and / or memory components). In some aspects, the processor components and memory components can be coupled together. For example, the processor components (e.g., one or more processors) and memory components (e.g., memory) can be operatively coupled, communicatively coupled, electronically coupled, and / or electrically coupled.

[0036] Typically, any number of wireless networks can be deployed in a given geographical area. Each wireless network can support a specific RAT and can operate on one or more frequencies. A RAT can also be referred to as a radio technology, air interface, etc. A frequency can also be referred to as a carrier, channel, etc. Each frequency can support a single RAT in a given geographical area to avoid interference between wireless networks using different RATs. In some cases, NR or 5G RAT networks can be deployed.

[0037] In some respects, two or more UEs 120 (e.g., shown as UE 120a and UE 120e) may communicate directly using one or more sidelink channels (e.g., without using base station 110 as an intermediary for communication). For example, UEs 120 may communicate using peer-to-peer (P2P) communication, device-to-device (D2D) communication, vehicle-to-everything (V2X) protocols (e.g., which may include vehicle-to-vehicle (V2V) protocols, vehicle-to-infrastructure (V2I) protocols, etc.) and / or mesh networks. In this case, UEs 120 may perform scheduling operations, resource selection operations, and / or other operations described herein as being performed by base station 110.

[0038] Devices of the wireless network 100 may communicate using the electromagnetic spectrum, which may be subdivided into various categories, bands, channels, etc., based on frequency or wavelength. For example, devices of the wireless network 100 may communicate using an operating band with a first frequency range (FR1) (spanning from 410 MHz to 7.125 GHz), and / or may communicate using an operating band with a second frequency range (FR2) (spanning from 24.25 GHz to 52.6 GHz). Frequencies between FR1 and FR2 are sometimes referred to as intermediate frequency (IF) bands. Although a portion of FR1 is greater than 6 GHz, FR1 is generally referred to as the “below 6 GHz” band. Similarly, FR2 is generally referred to as the “millimeter wave” band, although it is different from the extremely high frequency (EHF) band (30 GHz–300 GHz) designated as the “millimeter wave” band by the International Telecommunication Union (ITU). Therefore, unless explicitly stated otherwise, it should be understood that the terms “below 6 GHz”, etc. (if used herein), can broadly refer to frequencies less than 6 GHz, frequencies within FR1, and / or intermediate frequency (e.g., greater than 7.125 GHz). Similarly, unless otherwise explicitly stated, it should be understood that the terms “millimeter wave” and the like (if used herein) can broadly refer to frequencies within the EHF band, frequencies within FR2, and / or intermediate frequency band frequencies (e.g., less than 24.25 GHz). It is anticipated that the frequencies included in FR1 and FR2 may be modified, and the techniques described herein are applicable to those modified frequency ranges.

[0039] As pointed out above, Figure 1 This is provided as an example. Other examples may differ from the one provided. Figure 1 As described.

[0040] Figure 2 This is a diagram illustrating an example of communication between a base station 110 and a UE 120 in a wireless network 100 according to various aspects of this disclosure. The base station 110 may be equipped with T antennas 234a to 234t, and the UE 120 may be equipped with R antennas 252a to 252r, wherein typically, T ≥ 1 and R ≥ 1.

[0041] At base station 110, transmitting processor 220 can receive data for one or more UEs from data source 212, select one or more modulation and coding schemes (MCS) for each UE based at least in part on channel quality indicators (CQI) received from each UE, process (e.g., code and modulate) the data for each UE based at least in part on the MCS selected for each UE, and provide data symbols for all UEs. Transmitting processor 220 can also process system information (e.g., semi-static resource allocation information (SRPI)) and control information (e.g., CQI requests, permission, and / or upper-layer signaling), and provide overhead symbols and control symbols. Transmitting processor 220 can also generate reference symbols for reference signals (e.g., cell-specific reference signals (CRS) or demodulation reference signals (DMRS)) and synchronization signals (e.g., primary synchronization signal (PSS) or secondary synchronization signal (SSS)). The transmit (TX) multiple-input multiple-output (MIMO) processor 230 can perform spatial processing (e.g., precoding, if applicable) on data symbols, control symbols, overhead symbols, and / or reference symbols, and can provide T output symbol streams to T modulators (MODs) 232a to 232t. Each modulator 232 can (e.g., for OFDM) process its corresponding output symbol stream to obtain an output sample stream. Each modulator 232 can further process (e.g., convert to analog, amplify, filter, and up-convert) the output sample stream to obtain a downlink signal. The T downlink signals from modulators 232a to 232t can be transmitted via T antennas 234a to 234t respectively.

[0042] At UE 120, antennas 252a to 252r can receive downlink signals from base station 110 and / or other base stations, and can provide the received signals to demodulators (DEMODs) 254a to 254r respectively. Each demodulator 254 can adjust (e.g., filter, amplify, down-convert, and digitize) the received signal to obtain an input sample. Each demodulator 254 can further process the input sample (e.g., for OFDM) to obtain a received symbol. MIMO detector 256 can obtain the received symbols from all R demodulators 254a to 254r, perform MIMO detection on the received symbols (if applicable), and provide the detected symbols. Receive processor 258 can process (e.g., demodulate and decode) the detected symbols, provide decoded data for UE 120 to data sink 260, and provide decoded control information and system information to controller / processor 280. The term "controller / processor" can refer to one or more controllers, one or more processors, or a combination thereof. The channel processor can determine parameters such as the Reference Signal Received Power (RSRP), Received Signal Strength Indicator (RSSI), Reference Signal Received Quality (RSRQ), and / or Channel Quality Indicator (CQI). In some aspects, one or more components of the UE 120 may be included in the housing 284.

[0043] Network controller 130 may include communication unit 294, controller / processor 290, and memory 292. Network controller 130 may include one or more devices, such as those in a core network. Network controller 130 may communicate with base station 110 via communication unit 294.

[0044] Antennas (e.g., antennas 234a to 234t and / or antennas 252a to 252r) may include or be included within the following: one or more antenna panels, antenna groups, antenna element sets, and / or antenna arrays, etc. Antenna panels, antenna groups, antenna element sets, and / or antenna arrays may include one or more antenna elements. Antenna panels, antenna groups, antenna element sets, and / or antenna arrays may include coplanar antenna element sets and / or non-coplanar antenna element sets. Antenna panels, antenna groups, antenna element sets, and / or antenna arrays may include antenna elements within a single housing and / or antenna elements within multiple housings. Antenna panels, antenna groups, antenna element sets, and / or antenna arrays may include antenna elements coupled to one or more transmitting and / or receiving components (e.g., Figure 2 One or more antenna elements (one or more components).

[0045] On the uplink, at UE 120, the transmitting processor 264 can receive and process data from data source 262 and control information from controller / processor 280 (e.g., for reporting RSRP, RSSI, RSRQ, and / or CQI). The transmitting processor 264 can also generate reference symbols for one or more reference signals. Symbols from the transmitting processor 264 can be pre-coded (if applicable) by TX MIMO processor 266, further processed by modulators 254a to 254r (e.g., for DFT-s-OFDM or CP-OFDM), and transmitted to base station 110. In some aspects, the modulator and demodulator (e.g., MOD / DEMOD 254) of UE 120 can be included in the modem of UE 120. In some aspects, UE 120 includes a transceiver. The transceiver may include any combination of antenna 252, modulator and / or demodulator 254, MIMO detector 256, receiver processor 258, transmitter processor 264, and / or TX MIMO processor 266. The transceiver may be used by a processor (e.g., controller / processor 280) and memory 282 to perform aspects of any of the methods described herein, for example, as referenced. Figure 3-9 As described.

[0046] At base station 110, uplink signals from UE 120 and other UEs can be received by antenna 234, processed by demodulator 232, detected by MIMO detector 236 (if applicable), and further processed by receiver processor 238 to obtain decoded data and control information transmitted by UE 120. Receiver processor 238 can provide decoded data to data sink 239 and decoded control information to controller / processor 240. Base station 110 may include communication unit 244 and communicate with network controller 130 via communication unit 244. Base station 110 may include scheduler 246 to schedule UE 120 for downlink and / or uplink communication. In some aspects, modulators and demodulators (e.g., MOD / DEMOD 232) of base station 110 may be included in the modem of base station 110. In some aspects, base station 110 includes a transceiver. The transceiver may include any combination of antenna 234, modulator and / or demodulator 232, MIMO detector 236, receiver processor 238, transmitter processor 220, and / or TX MIMO processor 230. The transceiver may be used by a processor (e.g., controller / processor 240) and memory 242 to perform aspects of any of the methods described herein, for example, as referenced. Figure 3-9 Described.

[0047] The controller / processor 240 of base station 110, the controller / processor 280 of UE 120 and / or Figure 2 Any other components may perform one or more techniques associated with side link feedback for multiple transmit-receive points (TRPs), as described in more detail elsewhere herein. For example, the controller / processor 240 of base station 110, the controller / processor 280 of UE 120, and / or Figure 2 Any other component can perform or direct, for example Figure 8 The process 800 Figure 9 The operation of process 900 and / or other processes as described herein. Memory 242 and 282 may store data and program code for base station 110 and UE 120, respectively. In some aspects, memory 242 and / or memory 282 may include a non-transitory computer-readable medium storing one or more instructions (e.g., code and / or program code) for wireless communication. For example, one or more instructions, when executed by one or more processors of base station 110 and / or UE 120 (e.g., directly, or after compilation, translation, and / or interpretation), may cause one or more processors, UE 120, and / or base station 110 to perform or direct, for example... Figure 8 The process 800 Figure 9 The operation of process 900 and / or other processes as described herein. In some aspects, the execution instructions may include run instructions, translation instructions, compilation instructions, and / or interpretation instructions, etc.

[0048] In some aspects, UE 120 includes: a unit for receiving a plurality of sidelink transmissions associated with a spatial division multiplexing (SDM) configuration, the SDM configuration indicating how the plurality of sidelink transmissions will be multiplexed spatially; a unit for failing to decode at least one of the plurality of sidelink transmissions; and / or a unit for transmitting feedback indicating failure to decode at least one sidelink transmission, wherein the feedback includes an indication of at least one layer of the SDM configuration associated with at least one sidelink transmission. Units for UE 120 to perform the operations described herein may include, for example, one or more of antenna 252, demodulator 254, MIMO detector 256, receive processor 258, transmit processor 264, TX MIMO processor 266, modulator 254, controller / processor 280, or memory 282.

[0049] In some aspects, UE 120 includes: a unit for determining whether to provide feedback on each sidelink transmission based at least in part on whether each of the plurality of sidelink transmissions is within a threshold range and whether feedback is enabled for each sidelink transmission.

[0050] In some aspects, UE 120 includes: a unit for determining, at least in part, the provision of feedback associated with multiple sidelink transmissions based on at least one of the following: the broadcast type of the multiple sidelink transmissions, the area identifier of the multiple sidelink transmissions, the range requirement of the multiple sidelink transmissions, or the determination that the multiple sidelink transmissions are SDM transmissions of a single packet set.

[0051] In some aspects, UE 120 includes: a unit for transmitting to a second UE a plurality of sidelink transmissions associated with an SDM configuration, the SDM configuration indicating how the plurality of sidelink transmissions will be spatially multiplexed; a unit for receiving feedback indicating failure to decode at least one of the plurality of sidelink transmissions, wherein the feedback includes an indication of at least one layer of the SDM configuration associated with at least one sidelink transmission; and / or a unit for selectively retransmitting at least one sidelink transmission based at least in part on the feedback. Units for the UE to perform the operations described herein may include, for example, one or more of antenna 252, demodulator 254, MIMO detector 256, receive processor 258, transmit processor 264, TXMIMO processor 266, modulator 254, controller / processor 280, or memory 282.

[0052] In some aspects, UE 120 includes: a unit for identifying at least one layer based at least in part on a set of resource elements (REs) on which instructions are transmitted; a unit for identifying communications to be retransmitted based at least in part on at least one layer; and / or a unit for retransmitting communications via at least one layer.

[0053] In some aspects, UE 120 includes: a unit for retransmitting an appropriate subset of multiple sidelink transmissions based at least in part on feedback including indications to at least one layer.

[0054] Although Figure 2 The boxes in the diagram are shown as different components, but the functions described above with respect to these boxes can be implemented in a single hardware, software, or combined component, or in various combinations of components. For example, the functions described with respect to transmit processor 264, receive processor 258, and / or TX MIMO processor 266 can be performed by controller / processor 280 or under the control of controller / processor 280.

[0055] As pointed out above, Figure 2 This is provided as an example. Other examples may differ from the one provided. Figure 2 As described.

[0056] Figure 3 This is a diagram illustrating example 300 of sidelink communication according to various aspects of this disclosure.

[0057] like Figure 3 As shown, the first UE 305-1 can communicate with the second UE 305-2 (and one or more other UEs 305) via one or more sidelink channels 310. UEs 305-1 and 305-2 can communicate using one or more sidelink channels 310 for P2P communication, D2D communication, V2X communication (e.g., which may include V2V communication, V2I communication, V2P communication, etc.), mesh networks, etc. In some aspects, UEs 305 (e.g., UEs 305-1 and / or UEs 305-2) can correspond to one or more other UEs described elsewhere herein, such as UE 120. In some aspects, one or more of the UEs 305 can be combined... Figure 5 A more detailed description of the multi-TRP UE. In some aspects, one or more sidelink channels 310 may use the ProSe sidelink (PC5) interface and / or may operate in a high-frequency band (e.g., the 5.9 GHz band). Alternatively or concurrently, the UE 305 may use Global Navigation Satellite System (GNSS) timing to synchronize the timing of transmission time intervals (TTIs) (e.g., frames, subframes, time slots, symbols, etc.).

[0058] like Figure 3 As further shown, one or more sidelink channels 310 may include a Physical Side Link Control Channel (PSCCH) 315, a Physical Side Link Shared Channel (PSSCH) 320, and / or a Physical Side Link Feedback Channel (PSFCH) 325. Similar to the Physical Downlink Control Channel (PDCCH) and / or Physical Uplink Control Channel (PUCCH) used for cellular communication with base station 110 via access link or access channel, PSCCH 315 may be used to transmit control information. Similar to the Physical Downlink Shared Channel (PDSCH) and / or Physical Uplink Shared Channel (PUSCH) used for cellular communication with base station 110 via access link or access channel, PSSCH 320 may be used to transmit data. For example, PSCCH 315 can carry sidelink control information (SCI) 330, which can indicate various control information for sidelink communication, such as one or more resources (e.g., time resources, frequency resources, space resources, etc.) of transport block (TB) 335 carried on PSCCH 320. TB 335 can include data. PSCCH 325 can be used to transmit sidelink feedback 340, such as hybrid automatic repeat request (HARQ) feedback (e.g., acknowledgment or negative acknowledgment (ACK / NACK) information), transmit power control (TPC), scheduling request (SR), etc.

[0059] In some aspects, one or more sidelink channels 310 may use resource pooling. For example, scheduling assignments may be transmitted in subchannels using specific resource blocks (RBs) spanning a time period (e.g., included in SCI 330). In some aspects, data transmissions associated with a scheduling assignment (e.g., on PSSCH 320) may occupy adjacent RBs in the same subframe as the scheduling assignment (e.g., using frequency division multiplexing). In some aspects, scheduling assignments and associated data transmissions are not transmitted on adjacent RBs. In some aspects, space division multiplexing (SDM) configurations may be used to transmit sidelink channels 310, and SDM configurations are described in more detail elsewhere herein.

[0060] In some aspects, UE 305 may operate using a transmission mode in which resource selection and / or scheduling is performed by UE 305 (e.g., not by base station 110). In some aspects, UE 305 may perform resource selection and / or scheduling by sensing the availability of the transmission channels. For example, UE 305 may measure Received Signal Strength Indicator (RSSI) parameters (e.g., sidelink RSSI (S-RSSI) parameters) associated with various sidelink channels, may measure Reference Signal Received Power (RSRP) parameters (e.g., PSSCH-RSRP parameters) associated with various sidelink channels, may measure Reference Signal Received Quality (RSRQ) parameters (e.g., PSSCH-RSRQ parameters) associated with various sidelink channels, and so on, and may select the channel for transmission for sidelink communication based at least in part on the measurements.

[0061] Alternatively, UE 305 may use SCI 330 received in PSCCH 315 to perform resource selection and / or scheduling, whereby SCI 320 may indicate occupied resources, channel parameters, etc. Alternatively, UE 305 may perform resource selection and / or scheduling by determining the Channel Busy Rate (CBR) associated with various sidelink channels, whereby the CBR may be used for rate control (e.g., by indicating the maximum number of resource blocks that UE 305 can use for a particular set of subframes).

[0062] In a transport mode where resource selection and / or scheduling is performed by UE 305, UE 305 can generate sidelink grants and can send the grants in SCI 330. Sidelink grants can indicate one or more parameters (e.g., transport parameters) for an upcoming sidelink transport, such as one or more resource blocks (e.g., for TB 335) to be used for an upcoming sidelink transport on PSSCH 320, one or more subframes to be used for an upcoming sidelink transport, modulation and coding scheme (MCS) to be used for an upcoming sidelink transport, etc. In some aspects, UE 305 can generate sidelink grants indicating one or more parameters (e.g., the period of the sidelink transport) for semi-persistent scheduling (SPS). Alternatively or concurrently, UE 305 can generate sidelink grants for event-driven scheduling (e.g., for on-demand sidelink messages).

[0063] As pointed out above, Figure 3 This is provided as an example. Other examples may differ from the one provided. Figure 3 As described.

[0064] Figure 4 This is a diagram illustrating example 400 of sidelink communication and access link communication according to various aspects of this disclosure.

[0065] like Figure 4 As shown, the transmitter (Tx) / receiver (Rx) UE 405 and the Rx / Tx UE 410 can communicate with each other via a side link, as described above. Figure 3 As described further, in some sidelink modes, base station 110 may communicate with Tx / Rx UE 405 via a first access link. Alternatively, in some sidelink modes, base station 110 may communicate with Rx / Tx UE 410 via a second access link. Tx / Rx UE 405 and / or Rx / Tx UE 410 may correspond to one or more UEs described elsewhere herein, such as... Figure 1 UE 120. Therefore, the direct link between UE 120 (e.g., via the PC5 interface) can be referred to as a sidelink, and the direct link between base station 110 and UE 120 (e.g., via the Uu interface) can be referred to as an access link. Sidelink communication can be transmitted via the sidelink, and access link communication can be transmitted via the access link. Access link communication can be downlink communication (from base station 110 to UE 120) or uplink communication (from UE 120 to base station 110).

[0066] As pointed out above, Figure 4This is provided as an example. Other examples may differ from the one provided. Figure 4 As described.

[0067] Figure 5 This is a diagram illustrating example 500 of multi-TRP communication (sometimes referred to as multi-panel communication) according to various aspects of this disclosure. Figure 5 As shown, multiple TRP 505s associated with UE 120-1 can communicate with the same UE 120-2.

[0068] A TRP 505 can be a distributed unit (DU) of UE 120-1, such as an antenna panel, antenna, antenna sub-panel, antenna array, etc. In some aspects, a TRP 505 can have a separate antenna and / or separate functional components, as well as a common control unit associated with UE 120-1. In some aspects, multiple TRPs 505 can use different quasi-co-location (QCL) relationships (e.g., different spatial parameters, different Transmission Configuration Indicator (TCI) states, different precoding parameters, different beamforming parameters, etc.) to transmit communication in the same transmission time interval (TTI) (e.g., time slots, micro-time slots, subframes, symbols, etc.) or in different TTIs (e.g., the same communication or different communication). In some aspects, a TCI state can be used to indicate one or more QCL relationships. For example, a TCI state can indicate the QCL relationship between a given channel (e.g., PSCCH, PSSCH, PSFCH, etc.) and the source signal. The TCI status can indicate that parameters to be used for a given channel (e.g., Doppler shift, Doppler spread, spatial parameters such as spatial reception parameters, average delay, delay spread, etc.) should be derived based on the source signal. TRP 505 can be configured to provide service to UE 120-2 individually (e.g., using dynamic selection) or jointly (e.g., using joint transmission with one or more other TRP 505s). Each TRP 505 may include a corresponding radio frequency (RF) module with shared hardware and / or software controllers. In some aspects, TRP 505 may be able to perform directional transmissions, for example, based at least in part on the aforementioned QCL relationships or spatial parameters.

[0069] In some aspects, multiple TRPs 505 of UE 120-1 can be implemented in association with a vehicle. For example, a vehicle-based UE can have two or more TRPs 505. In some aspects, a car can have a front antenna panel and a rear antenna panel (e.g., TRPs 505). In some aspects, a vehicle can have many TRPs 505. For example, a larger vehicle (such as a truck or tractor-trailer) can have several TRPs 505. The TRPs 505 of a vehicle can be spatially separated from each other. As just two examples, the front and rear TRPs 505s on a car can be separated from each other by approximately 3 to 4 meters, while a tractor-trailer can have an interval of approximately 20 meters between the TRPs 505. This displacement between TRP 505s can mean that each TRP 505 can view the channel differently from the other TRP 505s (e.g., the propagation path and / or propagation characteristics of the signals received or transmitted by each TRP 505), for example, due to differences in distance, line-of-sight versus non-line-of-sight channels, congestion, etc.

[0070] Multiple TRP 505 (in) Figure 5 TRPs 505 (represented as TRP A and TRP B) can communicate with the same UE 120-2 in a coordinated manner (e.g., using coordinated multicast, etc.) to improve reliability, increase throughput, etc. TRPs 505 can coordinate such communication via an interface between TRPs 505 (e.g., via UE 120-1 managing the TRPs 505). Different TRPs 505 can communicate with UE 120-2 using different QCL relationships (e.g., different TCI states), different demodulation reference signal (DMRS) ports, different layers (e.g., layers of multi-layer communication), etc.

[0071] In some aspects, TRP 505 can use SDM configuration to transmit sidelink communications. SDM configuration can indicate how communications will be multiplexed across different spatial layers (hereinafter referred to as "layers"). Communications transmitted using SDM configuration can be associated with common control signals, such as a common PSCCH carrying sidelink control information (SCI). The SCI can carry information about the SDM configuration, such as instructions on how to multiplex multiple sidelink transmissions, how to decode each layer, and so on. For example, different layers can have different Hybrid Automatic Repeat Request (HARQ) process identifiers, Quadrature Demodulation Reference Signal (DMRS) modes, etc., so that communications on different layers can be distinguished from each other at UE 120-2. Multiple sidelink transmissions transmitted using SDM configuration can be transmitted on at least partially overlapping time and frequency (time-frequency or time / frequency) resources.

[0072] As pointed out above, Figure 5This is provided as an example. Other examples may differ from the one provided. Figure 5 As described.

[0073] A UE (e.g., UE 120, UE 305, UE 405 / 410) can send feedback about sidelink transmissions via the PSFCH. For example, the UE can determine the result of decoding a communication (e.g., PSCCH or PSSCH) and can provide HARQ feedback (e.g., ACK or NACK) about the communication via the PSFCH. The PSFCH can be associated with PSFCH resources. Feedback can be mapped to PSFCH resources based at least in part on the time-frequency resources occupied by the communication associated with the feedback and the source identifier of the communication. For example, a receiving UE (e.g., UE 120-2) can be configured (e.g., pre-configured, configured via radio resource control signaling, etc.) with rules indicating how feedback about the communication will be mapped to the communication, and these rules can be based at least in part on the time-frequency resources on which the communication is received and the source identifier (e.g., information identifying the UE sending the communication).

[0074] Some sidelink transmissions can be associated with an SDM configuration. As mentioned above, the SDM configuration can indicate how multiple sidelink transmissions associated with at least partially overlapping time-frequency resource allocations will be spatially multiplexed at the appropriate layer for transmission to the receiving UE. However, if the feedback resources for multiple sidelink transmissions are determined at least in part based on the time-frequency resource allocations of the multiple sidelink transmissions, and if the multiple sidelink transmissions overlap with each other, feedback for multiple sidelink transmissions can be mapped to the same feedback resource. This can be particularly problematic for connectionless multicast and broadcast communications, since for multicast and broadcast communications, the destination identifier of the communication is not specified and therefore cannot be used to distinguish the communications from each other in order to determine the feedback resources.

[0075] If the transmitter (e.g., UE 120-1) cannot distinguish which communication is associated with feedback received on the PSFCH resource—for example, because multiple communications are mapped to the PSFCH resource—the transmitter may use communication and processing resources to retransmit each communication associated with the PSFCH resource. Alternatively, the transmitter may ignore the feedback, resulting in reduced throughput between the transmitter and receiver. Therefore, the reliability and efficiency of sidelink communication are degraded, particularly for multi-TRP UEs performing sidelink communication.

[0076] Some of the techniques and apparatuses described herein provide competing solutions for feedback on PSFCH resources related to multiple sidelink transmissions. For example, some of the techniques and apparatuses described herein provide for determining feedback of communication and its associated one or more layers, the communication including multiple sidelink transmissions associated with an SDM configuration. In some aspects, a receiving UE (e.g., UE 120-2) may fail to decode one or more of the multiple sidelink transmissions and may identify one or more layers corresponding to the one or more sidelink transmissions. The receiving UE may provide feedback indicating one or more layers. For example, the receiving UE may provide a common NACK associated with all layers of the multiple sidelink transmissions and may provide an indication of one or more layers in association with the common NACK (e.g., in the same PSFCH resource). A sending UE (e.g., which sent at least one of the multiple sidelink transmissions) may receive feedback on the PSFCH resource, may identify one or more layers at least in part based on the indication, and may take appropriate actions (e.g., retransmit one or more sidelink communications associated with one or more layers, modify the transport configuration or SDM configuration at least in part based on the feedback, etc.).

[0077] By providing feedback indicating one or more layers associated with one or more failed side-link transmissions related to the SDM configuration, the receiving UE enables the sending UE to identify a subset of layers in the SDM communication that were not received by the receiving UE. Therefore, the sending UE can retransmit a subset of the SDM communication transmissions, thereby saving communication and computational resources associated with indiscriminate retransmission of SDM communication and improving throughput compared to determining not to retransmit SDM communication. Alternatively, the sending UE can adjust the transmission configuration or SDM configuration at least in part based on the feedback, which can improve the reliability and robustness of SDM communication. Furthermore, the use of common NACK and the indication of one or more layers improves backward compatibility with UEs that can only detect common NACK.

[0078] Figure 6 This is a diagram illustrating example 600 of signaling associated with feedback for multiple sidelink transmissions via spatial multiplexing, according to various aspects of this disclosure. As shown, example 600 includes UE 120-1 and UE 120-2 (e.g., UE 120, UE 305, UE 405 / 410). As further shown, UE 120-2 may be associated with a first TRP and a second TRP (e.g., TRP 505, and...). Figure 6 The two are associated with each other (represented as TRP 1 and TRP 2 respectively).

[0079] As in Figure 6As shown by reference numeral 610 in the accompanying drawings, UE 120-1 can receive control information from UE 120-2 (e.g., via a first TRP or a second TRP). For example, the control information may include an SCI transmitted via the PSSCH. As further shown, the SCI may carry scheduling information for multiple sidelink transmissions. For example, the SCI may indicate resource allocation (e.g., time-frequency resource allocation) and SDM configuration for multiple sidelink transmissions. In some aspects, the SDM configuration may be included in the indication of resource allocation. For example, based at least in part on quasi-co-location information (e.g., the state of one or more Transport Configuration Indicators (TCIs) for multiple sidelink transmissions), layer-associated identifiers, etc., the SDM configuration may indicate the layer (e.g., spatial layer) for carrying each of the multiple sidelink transmissions. In some aspects, communications (e.g., packets, etc.) may be transmitted by UE 120-2 at multiple layers via multiple sidelink transmissions, thereby providing spatial diversity for communications.

[0080] In some aspects, the PSCCH (e.g., and / or SCI) can be a common control channel for each of the multiple sidelink transmissions. For example, the PSSCH can schedule each of the multiple sidelink transmissions. In some aspects, UE 120 can determine scheduling information to schedule the transmissions of the multiple sidelink transmissions associated with the SDM configuration. In some aspects, the SCI can include a first part (e.g., SCI-1) and a second part (e.g., SCI-2). In some aspects, the first part can be common to the multiple sidelink transmissions, and the second part can be specific to each of the multiple sidelink transmissions. In some aspects, the first and second parts can be common to the multiple sidelink transmissions.

[0081] In some aspects, multiple sidelink transmissions can have broadcast types that are not associated with a destination identifier. For example, multiple sidelink transmissions can be multicast transmissions, broadcast transmissions, etc. A broadcast type not associated with a destination identifier is a transmission using that broadcast type that does not include a destination identifier. For example, unicast is a broadcast type associated with a destination identifier, while multicast and broadcast are broadcast types not associated with a destination identifier.

[0082] In some aspects, UE 120-1 can determine whether to provide feedback for a specific layer (or a specific sidelink transmission) scheduled by the PSSCH. For example, UE 120-1 can identify one or more layers among multiple layers associated with multiple sidelink transmissions to be included in a group (referred to herein as the group of interest or scope of interest) for which UE 120-1 will provide feedback. In some aspects, UE 120-1 can identify one or more layers at least in part based on the broadcast type (e.g., unicast, multicast, etc.). For example, UE 120-1 can determine to provide feedback for layers associated with one or more sidelink transmissions of a specific broadcast type. In some aspects, UE 120-1 can identify one or more layers at least in part based on a region identifier or other location information associated with one or more layers. For example, UE 120-1 can determine to provide feedback for layers associated with a sidelink transmission that is associated with the same region identifier or a communication range requirement inferred from the region identifier (e.g., the same region identifier as UE 120-1). In some aspects, UE 120-1 may identify one or more layers based at least in part on range requirements associated with multiple sidelink transmissions. For example, UE 120-1 may determine to provide feedback for layers associated with sidelink transmissions of UE 120-1 within a threshold range identified by the range requirements. In some aspects, UE 120-1 may identify one or more layers based at least in part on an indication of whether to provide feedback (e.g., an indication of whether to enable feedback). For example, an SCI (e.g., a second part of an SCI, such as SCI-2) may indicate whether to provide feedback for the corresponding sidelink transmission or layer.

[0083] In some respects, UE 120 may determine whether to provide feedback for a given sidelink transmission based at least in part on the required range, the reference signal received power (RSRP) of the DMRS transmitted on the sidelink, and an indication of whether feedback is enabled for a given layer. For example, UE 120-1 may perform this determination at least in part based on the following table, where “low” indicates a DMRS RSRP that fails to meet a threshold, and “high” indicates a DMRS RSRP that meets a threshold:

[0084] Data DMRS RSRP Should we send feedback? Out of range and feedback disabled - no Within range and with feedback enabled. Low no Within range and with feedback enabled. high yes

[0085] In some aspects, UE 120-1 can determine whether to provide feedback for each sidelink transmission (e.g., each packet) sent on a layer included in the group of interest, as described above. For example, UE 120-1 can use the table shown above regarding each sidelink transmission received on a layer included in the group of interest to determine whether feedback should be provided for each sidelink transmission.

[0086] As shown by reference numeral 620, UE 120-2 can transmit multiple sidelink transmissions associated with the SDM configuration indicated by control information. For example, UE 120-2's first TRP can transmit a first sidelink transmission (SL transmission 1) at Layer 1, and UE 120-2's second TRP can transmit a second sidelink transmission (SL transmission 2) at Layer 2. In some aspects, the first and second sidelink transmissions can carry corresponding communications (e.g., corresponding packets or groups of packets). The first and second sidelink transmissions can be transmitted via corresponding resource allocations indicated by the PSCCH shown by reference numeral 610.

[0087] As indicated by reference numeral 630, UE 120-1 may fail to receive one or more of a plurality of sidelink transmissions. For example, UE 120-1 may fail to decode one or more sidelink transmissions. In example 600, UE 120-1 fails to receive a first sidelink communication at Layer 1. In some aspects, UE 120-1 may fail to receive a subset of the plurality of sidelink transmissions. In some aspects, UE 120-1 may fail to receive all of the plurality of sidelink transmissions.

[0088] As indicated by reference numeral 640, UE 120-1 can send and UE 120-2 can receive feedback regarding multiple sidelink transmissions. For example, UE 120-1 can determine that it has failed to receive one or more sidelink transmissions on one or more layers. UE 120-1 can send feedback indicating the failure to decode one or more sidelink transmissions via PSFCH resources. For example, UE 120-1 can receive information configuring the period (in timeslots) for PSFCH timing resources (referred to herein as PSFCH resources). If the period indicates that a timeslot contains PSFCH resources, UE 120-1 can send feedback on the PSFCH resources in that timeslot. "PSFCH resources" may be used interchangeably with "PSFCH timing" herein.

[0089] As shown, feedback may include a public NACK. A public NACK (which may be referred to as a primary NACK or a first NACK) is an indication that UE 120-1 has not received at least one sidelink transmission associated with the PSFCH resource. If UE 120-1 has successfully received all of the multiple sidelink transmissions associated with the PSFCH resource, UE 120-1 may send a public ACK, which indicates that UE 120-1 has successfully received all of the multiple sidelink transmissions associated with the PSFCH resource. In some aspects, UE 120-1 may identify the PSFCH resource used for the public NACK. In some aspects, the public NACK may be located at a resource defined by the time / frequency resources associated with the multiple sidelink transmissions (e.g., within the PSFCH resource). In some aspects, UE 120-1 may identify the PSFCH resource for common NACK based at least in part on time-frequency resources associated with multiple sidelink communications, source identifiers of multiple sidelink transmissions (e.g., source identifier associated with UE 120-2), etc. As another example, UE 120-1 may identify the PSFCH resource based at least in part on the period associated with the PSFCH resource (e.g., feedback may be sent in the next time slot including the PSFCH resource after multiple sidelink transmissions).

[0090] As further illustrated, the feedback may include an indication (which may be referred to as one or more secondary NACKs) of at least one layer associated with at least one sidelink transmission that UE 120-1 failed to decode, configured for the SDM. In Example 600, the indication may indicate the first layer. In some aspects, the indication may be sent on several resource elements (REs) equal to the number of layers on which at least one sidelink transmission failed. The indication may include information on each of the several REs indicating whether UE 120-1 failed to receive the sidelink transmission at the corresponding layer. For example, such information may be a binary indication (e.g., ACK / NACK), a sequence of binary indications on multiple REs, etc.

[0091] In some aspects, UE 120-1 can identify several REs used to carry an indication (e.g., the number of REs and / or a specific RE). For example, the number of REs for a PSFCH resource can be determined by N. RE The number of REs not used by the PSFCH channel (e.g., public NACK) or other communications can be represented by N0. UE 120-1 can select several REs from the N0 REs not used by the PSFCH channel on the PSFCH symbol. For example, in a PSFCH symbol with N... RE In a system with multiple REs, the PSFCH channel will be [0, N] RE-N0-1] is used for PSFCH, UE 120-1 can transfer data from [N] RE -N0,N RE The REs selected or enumerated in [0, N0-1] are used for indication. UE 120-1 may select (e.g., enumerate) L REs from N0 REs, where L is the number of layers included in the group of interest. For example, the indication may be sent on several REs equal to the number of layers on which at least one sidelink transmission has failed. In some aspects, UE 120-1 may select N0 REs from [0, N0-1]. For example, UE 120-1 may select the starting index i for indication based at least in part on at least one source identifier associated with at least one sidelink transmission and at least in part on the number of layers: i = mod(L*S) ID ,N0), where S ID This is the source identifier (i.e., the transmitter identifier). In another example, N0 resources can be split into X blocks, where X is the maximum number of spatial streams or layers supported by the UE 120-1. For each RE set, the UE 120-1 can select an index. In yet another example, UE 120-1 may partition the PSFCH resources at least in part based on the number of layers (L) in the group of interest, the time resource T (e.g., relative transmission time interval (TTI)) associated with at least one sidelink transmission associated with multiple sidelink transmissions, and the frequency resource f (e.g., subchannel or resource block (RB) allocation) associated with at least one sidelink transmission, and then the starting index for indication can be determined as The indication may include information on each of several REs indicating whether UE 120-1 failed to receive sidelink transmissions at the corresponding layer.

[0092] As indicated by reference numeral 650 in the accompanying drawings, UE 120-2 may retransmit one or more sidelink transmissions indicated by feedback. For example, UE 120-2 may determine that UE 120-1 failed to receive one or more sidelink transmissions at one or more layers, as indicated by the feedback. Therefore, UE 120-2 may retransmit one or more sidelink transmissions. In some aspects, UE 120-2 may modify the transmission configuration used for retransmitting one or more sidelink transmissions. For example, UE 120-2 may use more robust modulation or coding, may increase the number of retransmissions, may use a different set of layers, etc.

[0093] In some respects, UE 120-2 can determine whether feedback has been received in the PSFCH resource. For example, UE 120-2 can determine the PSFCH resource as described above with respect to UE 120-1. If UE 120-2 does not detect a common NACK in the PSFCH resource, UE 120-2 can determine that UE 120-1 has successfully received multiple sidelink communications. If UE 120-2 detects a common NACK, UE 120-2 can determine that UE 120-1 has not successfully received one or more sidelink transmissions out of multiple sidelink transmissions. If UE 120-2 detects a common NACK, UE 120-2 can identify the number of REs (e.g., the number of REs and / or a specific RE) on which the indication was sent, as described above with respect to UE 120-1. If one or more of the REs in that number indicate a NACK (e.g., indicating that no sidelink transmission on the corresponding layer of the group of interest was received), then UE 120-2 can identify at least one layer at least partially based on the one or more REs on which the indication was sent, and can identify one or more communications to be retransmitted at least partially based on the layer or set of layers associated with the NACK. Therefore, UE 120-2 can retransmit communications on one or more layers that may correspond to an appropriate subset (e.g., less than all) of UE 120-2's multiple sidelink transmissions. If UE 120-2 does not detect a NACK in any of the REs on which the indication is to be sent, then UE 120-2 can retransmit all of the multiple sidelink communications.

[0094] It should be noted that using a common NACK and indications for one or more layers enables backward compatibility with legacy UEs. For example, a UE that cannot interpret indications for one or more layers can still interpret a common NACK and therefore can retransmit multiple sidelink transmissions. In another example, such a UE can select the set of sidelink transmissions for retransmission based at least in part on PSFCH signal power measurements (e.g., reference signal received power, etc.) on each TRP of the UE and supplementary feedback (when available) sent by other sidelink UEs.

[0095] As pointed out above, Figure 6 This is provided as an example. Other examples may differ from the one provided. Figure 6 As described.

[0096] Figure 7This is a diagram illustrating a time slot structure 700 according to various aspects of this disclosure, which includes feedback regarding multiple sidelink transmissions associated with an SDM configuration. Structure 700 includes PSCCH, PSSCH, and PSFCH resources 710 (as well as Automatic Gain Control (AGC) symbols indicated by diagonal padding and gap symbols indicated by dashed padding). Resources used for public NACK are indicated by reference numeral 720. As shown, the last two symbols of a time slot, excluding the gap symbols, can be used for PSFCH transmission. Potential resources for indications to one or more layers are indicated by reference numeral 730. As shown, indications can be transmitted in the same PSFCH resources (e.g., the same PSFCH transmission timing resources) as public NACK using one or more unused REs not used by public NACK, thereby providing backward compatibility and more accurate indication of HARQ feedback for SDM communication in sidelink networks with multiple TRP transmitters.

[0097] As pointed out above, Figure 7 This is provided as an example. Other examples may differ from the one provided. Figure 7 As described.

[0098] Figure 8 This is a diagram illustrating, for example, an example process 800 performed by a UE according to various aspects of this disclosure. Example process 800 is an example in which a UE (e.g., UE 120) performs operations associated with side link feedback for multiple transmit-receive points.

[0099] like Figure 8 As shown, in some aspects, process 800 may include: receiving multiple side link transmissions associated with a spatial division multiplexing (SDM) configuration, the SDM configuration indicating how the multiple side link transmissions will be multiplexed spatially (block 810). For example, a UE (e.g., using...) Figure 10 The receiving component 1002 depicted can receive multiple side link transmissions associated with an SDM configuration that indicates how the multiple side link transmissions will be multiplexed spatially, as described above.

[0100] like Figure 8 Further, in some aspects, process 800 may include: failing to decode at least one of a plurality of sidelink transmissions (block 820). For example, the UE (e.g., using...) Figure 10 The receiving component 1002 described herein may fail to decode at least one of the multiple sidelink transmissions, as described above.

[0101] like Figure 8As further shown, in some aspects, process 800 may include: sending feedback indicating failure to decode at least one sidelink transmission, wherein the feedback includes an indication of at least one layer of the SDM configuration associated with at least one sidelink transmission (block 830). For example, the UE (e.g., using...) Figure 10 The transmitting component 1004 described herein may transmit feedback indicating failure to decode at least one side link transmission, wherein the feedback includes an indication of at least one layer of the SDM configuration associated with at least one side link transmission, as described above.

[0102] Process 800 may include additional aspects, such as any single aspect or any combination thereof described below and / or in conjunction with one or more other process descriptions elsewhere described herein.

[0103] In the first aspect, the indication is sent in a sidelink feedback channel having a common NACK corresponding to multiple sidelink transmissions, and the indication is sent on a resource element in the sidelink feedback channel that is not used by the common NACK.

[0104] In the second aspect, either alone or in combination with the first aspect, process 800 includes: determining whether to provide feedback on each sidelink transmission based at least in part on whether each of the plurality of sidelink transmissions is within a threshold range and whether feedback is enabled for each sidelink transmission.

[0105] In the third aspect, either alone or in combination with one or more of the first and second aspects, process 800 includes: determining, at least in part, to provide feedback associated with the multiple sidelink transmissions based on at least one of the following: the broadcast type of the multiple sidelink transmissions, the area identifier of the multiple sidelink transmissions, the range requirement of the multiple sidelink transmissions, or the determination that the multiple sidelink transmissions are SDM transmissions of a single packet set.

[0106] In the fourth aspect, either alone or in combination with one or more of the first to third aspects, the negative acknowledgment of the feedback is located at a resource defined by time and frequency (time / frequency) resources associated with multiple side link transmissions.

[0107] In the fifth aspect, either alone or in combination with one or more of the first to fourth aspects, it indicates that the transmission is in a sidelink feedback channel having a common NACK corresponding to multiple sidelink transmissions, and indicates that the transmission is on a number of REs equal to the number of layers on which at least one sidelink transmission has failed.

[0108] In the sixth aspect, either alone or in combination with one or more of the first to fifth aspects, several REs are selected based at least in part on at least one source identifier associated with at least one side link transmission.

[0109] In the seventh aspect, either alone or in combination with one or more of the first to sixth aspects, several REs are selected at least in part based on the number of layers on which at least one side link transmission fails and the maximum number of layers supported by the UE.

[0110] In the eighth aspect, either alone or in combination with one or more of the first to seventh aspects, several REs are selected based at least in part on the following: the number of layers on which at least one sidelink transmission fails, the maximum number of layers supported by the UE, the time resources associated with at least one sidelink transmission, and the frequency resources associated with at least one sidelink transmission.

[0111] In the ninth aspect, either alone or in combination with one or more of the first to eighth aspects, it indicates that information indicating whether the UE has failed to receive sidelink transmissions at the corresponding layer is included on each of the plurality of REs.

[0112] In the tenth aspect, either alone or in combination with one or more aspects from the first to the ninth aspect, multiple sidelink transmissions have broadcast types that are not associated with a destination identifier.

[0113] Although Figure 8 The example box of process 800 is shown, but in some aspects, process 800 may include... Figure 8 The boxes depicted in the diagram are compared to additional boxes, fewer boxes, different boxes, or boxes arranged in a different manner. Alternatively, two or more boxes in process 800 may be executed in parallel.

[0114] Figure 9 This is a diagram illustrating, for example, an example process 900 performed by a UE according to various aspects of this disclosure. Example process 900 is an example in which a first UE (e.g., UE 120, UE 305, UE 405 / 410) performs operations associated with side link feedback for multiple transmit-receive points.

[0115] like Figure 9 As shown, in some aspects, process 900 may include: sending to a second UE multiple sidelink transmissions associated with an SDM configuration indicating how the multiple sidelink transmissions will be multiplexed spatially (block 910). For example, a first UE (e.g., using...) Figure 11The transmitting component 1104 described herein can transmit multiple side link transmissions associated with an SDM configuration to a second UE, the SDM configuration indicating how the multiple side link transmissions will be multiplexed spatially, as described above.

[0116] like Figure 9 As further shown, in some aspects, process 900 may include: receiving feedback indicating a failure to decode at least one of a plurality of sidelink transmissions, wherein the feedback includes an indication of at least one layer of the SDM configuration associated with the at least one sidelink transmission (block 920). For example, the UE (e.g., using...) Figure 11 The receiving component 1102 depicted herein may receive feedback indicating failure to decode at least one of a plurality of sidelink transmissions, wherein the feedback includes an indication of at least one layer of the SDM configuration associated with at least one sidelink transmission, as described above.

[0117] like Figure 9 As further shown, in some aspects, process 900 may include: selectively retransmitting at least one side link transmission based at least in part on feedback (block 930). For example, the UE (e.g., using...) Figure 11 The transmitting component 1104 described herein can selectively retransmit at least one side link transmission based at least in part on feedback, as described above.

[0118] Process 900 may include additional aspects, such as any single aspect or any combination thereof described below and / or in conjunction with one or more other process descriptions elsewhere described herein.

[0119] In the first aspect, selectively retransmitting at least one side link transmission based at least in part on feedback further includes: identifying at least one layer based at least in part on a set of REs on which instructions are sent; identifying the communication to be retransmitted based at least in part on at least one layer; and retransmitting the communication via at least one layer.

[0120] In the second aspect, either alone or in combination with the first aspect, the RE set is based at least in part on at least one source identifier associated with the first UE.

[0121] In the third aspect, either alone or in combination with one or more of the first and second aspects, the RE set is selected at least in part based on the number of layers on which at least one side link transmission fails and the maximum number of layers supported by the second UE.

[0122] In the fourth aspect, either alone or in combination with one or more of the first to third aspects, the RE set is selected based at least in part on the following: the number of layers on which at least one sidelink transmission fails, the maximum number of layers supported by the second UE, the time resources associated with at least one sidelink transmission, and the frequency resources associated with at least one sidelink transmission.

[0123] In the fifth aspect, either alone or in combination with one or more of the first to fourth aspects, it is indicated that information indicating whether the second UE failed to receive sidelink transmissions at the corresponding layer is included on each RE in the RE set.

[0124] In the sixth aspect, selectively retransmitting at least one side link transmission based at least in part on feedback, either alone or in combination with one or more of the first to fifth aspects, further includes retransmitting an appropriate subset of multiple side link transmissions based at least in part on feedback including indications to at least one layer.

[0125] In the seventh aspect, either alone or in combination with one or more of the first to sixth aspects, the first UE is a multi-TRP UE, and multiple sidelink transmissions are sent via the corresponding TRP of the first UE.

[0126] Although Figure 9 An example box of process 900 is shown, but in some aspects, process 900 may include... Figure 9 The boxes depicted in the diagram are compared to additional boxes, fewer boxes, different boxes, or boxes arranged in a different manner. Alternatively, two or more boxes in process 900 may be executed in parallel.

[0127] Figure 10 This is a block diagram of an example device 1000 for wireless communication. Device 1000 may be a UE, or a UE may include device 1000. In some aspects, device 1000 includes a receiving component 1002 and a transmitting component 1004, which can communicate with each other (e.g., via one or more buses and / or one or more other components). As shown, device 1000 can use the receiving component 1002 and the transmitting component 1004 to communicate with another device 1006 (such as a UE, a base station, or another wireless communication device). As further shown, device 1000 may include a determining component 1008, etc.

[0128] In some respects, device 1000 can be configured to perform the functions described herein. Figure 3-7 One or more operations described herein. Alternatively or concurrently, the device 1000 may be configured to perform one or more processes described herein, such as... Figure 8The process 800 or a combination thereof. In some respects, Figure 10 The device 1000 and / or one or more components shown may include the above-described components. Figure 2 One or more components of the UE as described. Alternatively or in addition, Figure 10 One or more components shown can be combined with the above. Figure 2 The description refers to implementation within one or more components. Alternatively, one or more components in the set of components may be implemented, at least partially, as software stored in memory. For example, a component (or a portion of a component) may be implemented as instructions or code stored in a non-transitory computer-readable medium and executable by a controller or processor to perform the function or operation of the component.

[0129] Receiver 1002 may receive communications from device 1006, such as reference signals, control information, data communications, or combinations thereof. Receiver 1002 may provide the received communications to one or more other components of device 1000. In some aspects, receiver 1002 may perform signal processing on the received communications (e.g., filtering, amplification, demodulation, analog-to-digital conversion, demultiplexing, deinterleaving, demapping, equalization, interference cancellation, or decoding, etc.) and may provide the processed signal to one or more other components of device 1006. In some aspects, receiver 1002 may include the elements described above. Figure 2 The described UE includes one or more antennas, demodulators, MIMO detectors, receiver processors, controllers / processors, memory, or combinations thereof.

[0130] Transmitting component 1004 can transmit communications, such as reference signals, control information, data communications, or combinations thereof, to device 1006. In some aspects, one or more other components of device 1006 can generate communications and provide the generated communications to transmitting component 1004 for transmission to device 1006. In some aspects, transmitting component 1004 can perform signal processing (e.g., filtering, amplification, modulation, digital-to-analog conversion, multiplexing, interleaving, mapping, or encoding, etc.) on the generated communications and can transmit the processed signals to device 1006. In some aspects, transmitting component 1004 may include the combinations described above. Figure 2 The described UE includes one or more antennas, modulators, transmit MIMO processors, transmit processors, controllers / processors, memory, or combinations thereof. In some aspects, the transmit component 1004 may be co-located with the receive component 1002 in a transceiver.

[0131] The receiving component 1002 may receive multiple sidelink transmissions associated with the SDM configuration. The receiving component 1002 may fail to decode at least one of the multiple sidelink transmissions. The transmitting component 1004 may send feedback indicating failure to decode at least one sidelink transmission, wherein the feedback includes an indication of at least one layer of the SDM configuration associated with at least one sidelink transmission.

[0132] The determining component 1008 may determine whether to provide feedback on each sidelink transmission based at least in part on whether each of the multiple sidelink transmissions is within a threshold range and whether feedback is enabled for each sidelink transmission.

[0133] The determining component 1008 may determine, at least in part, the feedback associated with the multiple sidelink transmissions based on at least one of the following: the broadcast type of the multiple sidelink transmissions, the area identifier of the multiple sidelink transmissions, the range requirement of the multiple sidelink transmissions, or the determination that the multiple sidelink transmissions are SDM transmissions of a single packet set.

[0134] Figure 10 The number and arrangement of components shown are provided as an example. In reality, they can exist in combination with... Figure 10 The components shown are compared to additional components, fewer components, different components, or components arranged in a different manner. Furthermore, Figure 10 The two or more components shown can be implemented within a single component, or Figure 10 The single component shown can be implemented as multiple distributed components. Alternatively, Figure 10 The set (one or more) components shown can perform actions described by Figure 10 The other set of components shown performs one or more functions.

[0135] Figure 11 This is a block diagram of an example device 1100 for wireless communication. Device 1100 may be a first UE, or a first UE may include device 1100. In some aspects, device 1100 includes a receiving component 1102 and a transmitting component 1104, which can communicate with each other (e.g., via one or more buses and / or one or more other components). As shown, device 1100 can use the receiving component 1102 and the transmitting component 1104 to communicate with another device 1106 (such as a UE, a base station, or another wireless communication device). As further shown, device 1100 may include a determining component 1108, etc.

[0136] In some respects, device 1100 can be configured to perform the functions described herein. Figure 3-7One or more operations described herein. Alternatively or concurrently, device 1100 may be configured to perform one or more processes described herein, such as... Figure 9 The process 900 or a combination thereof. In some respects, Figure 11 The device 1100 and / or one or more components shown may include the above-described components. Figure 2 One or more components of the first UE described. Alternatively or additionally, Figure 11 One or more components shown can be combined with the above. Figure 2 The description refers to implementation within one or more components. Alternatively, one or more components in the set of components may be implemented, at least partially, as software stored in memory. For example, a component (or a portion of a component) may be implemented as instructions or code stored in a non-transitory computer-readable medium and executable by a controller or processor to perform the function or operation of the component.

[0137] Receiver 1102 may receive communications from device 1106, such as reference signals, control information, data communications, or combinations thereof. Receiver 1102 may provide the received communications to one or more other components of device 1100. In some aspects, receiver 1102 may perform signal processing on the received communications (e.g., filtering, amplification, demodulation, analog-to-digital conversion, demultiplexing, deinterleaving, demapping, equalization, interference cancellation, or decoding, etc.) and may provide the processed signal to one or more other components of device 1106. In some aspects, receiver 1102 may include the elements described above. Figure 2 The first UE described includes one or more antennas, demodulators, MIMO detectors, receiver processors, controllers / processors, memory, or combinations thereof.

[0138] Transmitting component 1104 can transmit communications, such as reference signals, control information, data communications, or combinations thereof, to device 1106. In some aspects, one or more other components of device 1106 can generate communications and provide the generated communications to transmitting component 1104 for transmission to device 1106. In some aspects, transmitting component 1104 can perform signal processing (e.g., filtering, amplification, modulation, digital-to-analog conversion, multiplexing, interleaving, mapping, or encoding, etc.) on the generated communications and can transmit the processed signals to device 1106. In some aspects, transmitting component 1104 can include the combinations described above. Figure 2 The first UE described includes one or more antennas, modulators, transmit MIMO processors, transmit processors, controllers / processors, memory, or combinations thereof. In some aspects, the transmit component 1104 may be co-located with the receive component 1102 in a transceiver.

[0139] Transmitting component 1104 can transmit multiple sidelink transmissions associated with the SDM configuration to the second UE. Receiving component 1102 can receive feedback indicating failure to decode at least one of the multiple sidelink transmissions, wherein the feedback includes an indication of at least one layer of the SDM configuration associated with the at least one sidelink transmission. Transmitting component 1104 can selectively retransmit at least one sidelink transmission based at least in part on the feedback. Determining component 1108 can determine resources.

[0140] Figure 11 The number and arrangement of components shown are provided as an example. In reality, they can exist in combination with... Figure 11 The components shown are compared to additional components, fewer components, different components, or components arranged in a different way. Furthermore, Figure 11 The two or more components shown can be implemented within a single component, or Figure 11 The single component shown can be implemented as multiple distributed components. Alternatively, Figure 11 The set (one or more) components shown can perform actions described by Figure 11 The other set of components shown performs one or more functions.

[0141] The following provides a summary of some aspects of this disclosure:

[0142] Aspect 1: A method of wireless communication performed by a user equipment (UE), comprising: receiving a plurality of sidelink transmissions associated with a spatial division multiplexing (SDM) configuration, the SDM configuration indicating how the plurality of sidelink transmissions will be multiplexed spatially; failing to decode at least one of the plurality of sidelink transmissions; and transmitting feedback indicating failure to decode at least one sidelink transmission, wherein the feedback includes an indication of at least one layer of the SDM configuration associated with at least one sidelink transmission.

[0143] Aspect 2: According to the method of aspect 1, the indication is sent in a sidelink feedback channel having common negative acknowledgments (NACKs) corresponding to multiple sidelink transmissions, and the indication is sent on a resource element in the sidelink feedback channel that is not used by common NACKs.

[0144] Aspect 3: The method according to any one of Aspects 1-2 further includes: determining whether to provide feedback on each sidelink transmission based at least in part on whether each of the plurality of sidelink transmissions is within a threshold range and whether feedback is enabled for each sidelink transmission.

[0145] Aspect 4: The method according to any one of Aspects 1-3 further includes: determining, at least in part, the feedback associated with the multiple sidelink transmissions based on at least one of the following: the broadcast type of the multiple sidelink transmissions, the area identifier of the multiple sidelink transmissions, the range requirement of the multiple sidelink transmissions, or the determination that the multiple sidelink transmissions are SDM transmissions of a single packet set.

[0146] Aspect 5: The method according to any one of Aspects 1-4, wherein the negative acknowledgment of the feedback is located at a resource defined by time and frequency (time / frequency) resources associated with multiple side link transmissions.

[0147] Aspect 6: The method according to any one of Aspects 1-5, wherein the indication is transmitted in a sidelink feedback channel having common negative acknowledgments (NACKs) corresponding to a plurality of sidelink transmissions, and wherein the indication is transmitted on a plurality of resource elements (REs) equal to the number of layers on which at least one sidelink transmission has failed.

[0148] Aspect 7: According to the method of aspect 6, wherein the plurality of REs are selected at least in part based on at least one source identifier associated with at least one side link transmission.

[0149] Aspect 8: According to the method of aspect 6, wherein the plurality of REs are selected at least in part based on the number of layers on which at least one side link transmission has failed and the maximum number of layers supported by the UE.

[0150] Aspect 9: According to the method of aspect 8, wherein the plurality of REs are selected at least in part based on the following: the number of layers on which at least one sidelink transmission fails, the maximum number of layers supported by the UE, the time resources associated with at least one sidelink transmission, and the frequency resources associated with at least one sidelink transmission.

[0151] Aspect 10: The method according to aspect 6, wherein the indication on each of the plurality of REs includes information indicating whether the UE has failed to receive side link transmissions at the corresponding layer.

[0152] Aspect 11: The method according to any one of Aspects 1-10, wherein the plurality of sidelink transmissions have a broadcast type not associated with a destination identifier.

[0153] Aspect 12: A method of wireless communication performed by a first user equipment (UE), comprising: transmitting to a second UE a plurality of sidelink transmissions associated with a spatial division multiplexing (SDM) configuration, the SDM configuration indicating how the plurality of sidelink transmissions will be multiplexed spatially; receiving feedback indicating failure to decode at least one of the plurality of sidelink transmissions, wherein the feedback includes an indication of at least one layer of the SDM configuration associated with the at least one sidelink transmission; and selectively retransmitting at least one sidelink transmission based at least in part on the feedback.

[0154] Aspect 13: The method according to aspect 12, wherein selectively retransmitting at least one side link transmission based at least in part on feedback further comprises: identifying at least one layer based at least in part on a set of resource elements (REs) on which instructions are sent; identifying the communication to be retransmitted based at least in part on at least one layer; and retransmitting the communication via at least one layer.

[0155] Aspect 14: The method according to aspect 13, wherein the RE set is based at least in part on at least one source identifier associated with the first UE.

[0156] Aspect 15: According to the method of aspect 13, wherein the RE set is selected at least in part based on the number of layers on which at least one side link transmission fails and the maximum number of layers supported by the second UE.

[0157] Aspect 16: According to the method of aspect 15, the set of REs is selected based at least in part on the following: the number of layers on which at least one sidelink transmission fails, the maximum number of layers supported by the second UE, the time resources associated with at least one sidelink transmission, and the frequency resources associated with at least one sidelink transmission.

[0158] Aspect 17: The method according to aspect 13, wherein the indication on each RE in the RE set includes information indicating whether the second UE failed to receive side link transmission at the corresponding layer.

[0159] Aspect 18: The method according to any one of Aspects 12-17, wherein selectively retransmitting at least one side link transmission based at least in part on feedback further comprises: retransmitting an appropriate subset of a plurality of side link transmissions based at least in part on feedback including an indication of at least one layer.

[0160] Aspect 19: The method according to any one of Aspects 12-18, wherein the first UE is a multiple transmit-receive point (TRP) UE, and wherein multiple sidelink transmissions are transmitted via the respective TRPs of the first UE.

[0161] Aspect 19: An apparatus for wireless communication at a device, comprising: a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform the method according to one or more of aspects 1-11.

[0162] Aspect 20: An apparatus for wireless communication, comprising a memory and one or more processors coupled to the memory, the memory and the one or more processors being configured to perform the method according to one or more of aspects 1-11.

[0163] Aspect 21: An apparatus for wireless communication, comprising at least one unit for performing the method according to one or more of aspects 1-11.

[0164] Aspect 22: A non-transitory computer-readable medium storing code for wireless communication, the code including instructions executable by a processor to perform the methods described in accordance with one or more of aspects 1-11.

[0165] Aspect 23: A non-transitory computer-readable medium storing a set of instructions for wireless communication, the set of instructions comprising one or more instructions which, when executed by one or more processors of a device, cause the device to perform the method according to one or more aspects of aspects 1-11.

[0166] Aspect 24: An apparatus for wireless communication at a device, comprising: a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform the method according to one or more of aspects 12-19.

[0167] Aspect 25: An apparatus for wireless communication, comprising a memory and one or more processors coupled to the memory, the memory and the one or more processors being configured to perform the method according to one or more aspects of aspects 12-19.

[0168] Aspect 26: An apparatus for wireless communication, comprising at least one unit for performing the method according to one or more aspects 12-19.

[0169] Aspect 27: A non-transitory computer-readable medium storing code for wireless communication, the code including instructions executable by a processor to perform the methods described in one or more of aspects 12-19.

[0170] Aspect 28: A non-transitory computer-readable medium storing a set of instructions for wireless communication, the set of instructions comprising one or more instructions which, when executed by one or more processors of a device, cause the device to perform the method described in one or more of aspects 12-19.

[0171] The foregoing disclosure provides explanations and descriptions, but is not intended to be exhaustive or to limit the aspects to the precise form disclosed. Modifications and variations may be made based on the foregoing disclosure, or modifications and variations may be derived from practice in the aspects.

[0172] As used herein, the term "component" is intended to be interpreted broadly as hardware and / or a combination of hardware and software. Whether referred to as software, firmware, middleware, microcode, hardware description language, or other names, "software" should be interpreted broadly as instructions, instruction sets, code, code segments, program code, programs, subroutines, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, threads of execution, procedures, and / or functions. As used herein, processors are implemented using hardware and / or a combination of hardware and software. It will be apparent that the systems and / or methods described herein can be implemented using various forms of hardware and / or combinations of hardware and software. The actual specialized control hardware or software code used to implement these systems and / or methods is not a limitation in any respect. Therefore, while the operation and behavior of systems and / or methods are described herein without reference to specific software code, it is to be understood that software and hardware can be designed to implement systems and / or methods, at least in part, based on the descriptions herein.

[0173] As used in this article, depending on the context, satisfying the threshold can refer to a value greater than the threshold, greater than or equal to the threshold, less than the threshold, less than or equal to the threshold, equal to the threshold, not equal to the threshold, etc.

[0174] Even if a specific combination of features is recited in the claims and / or disclosed in the specification, such combinations are not intended to limit the disclosure of the aspects. In fact, many of these features can be combined in ways that are not specifically recited in the claims and / or specifically disclosed in the specification. While each dependent claim listed below may depend directly on only one claim, the disclosure of the aspects includes combinations of each dependent claim with every other claim in the claim set. As used herein, the phrase “at least one of” in the list of items refers to any combination of those items, including single members. For example, “at least one of a, b, or c” is intended to cover a, b, c, ab, ac, bc, and abc, as well as any combination of multiples of the same element (e.g., aa, aaa, aab, aac, abb, acc, bb, bbb, bbc, cc, and ccc, or any other ordering of a, b, and c).

[0175] The elements, actions, or instructions used herein should not be construed as critical or essential unless explicitly stated otherwise. Furthermore, as used herein, the articles “a” and “an” are intended to include one or more items and may be used interchangeably with “one or more.” Furthermore, as used herein, the article “the” is intended to include one or more items referenced in combination with the article “the” and may be used interchangeably with “one or more.” Furthermore, as used herein, the terms “set” and “group” are intended to include one or more items (e.g., related items, unrelated items, or a combination of related and unrelated items) and may be used interchangeably with “one or more.” Where only one item is intended, the phrase “only one” or similar language is used. Furthermore, as used herein, the terms “has,” “have,” “having,” etc., are intended to be open-ended terms. Furthermore, unless explicitly stated otherwise, the phrase “based on” is intended to mean “at least partially based on.” Furthermore, as used herein, the term “or” is intended to be inclusive when used in a series and may be used interchangeably with “and / or” unless otherwise expressly stated (e.g., if used in conjunction with “any” or “only one of”).

Claims

1. A user equipment (UE) for wireless communication, comprising: Memory; as well as One or more processors operatively coupled to the memory, the one or more processors being configured to: Receive multiple sidelink transmissions, wherein the multiple sidelink transmissions are transmitted using a spatial division multiplexing (SDM) configuration, the SDM configuration indicating how the multiple sidelink transmissions will be multiplexed spatially; Decode the multiple sidelink transmissions; and If at least one of the plurality of sidelink transmissions fails to be decoded, feedback indicating the failure to decode the at least one sidelink transmission is sent, wherein the feedback includes an indication of at least one layer of the SDM configuration regarding the at least one sidelink transmission, and wherein the indication is sent in a sidelink feedback channel having a common negative acknowledgment (NACK) corresponding to the plurality of sidelink transmissions, and wherein the indication is sent on a resource element in the sidelink feedback channel that is not used by the common NACK.

2. The UE according to claim 1, wherein, The multiple sidelink transmissions have broadcast types that are not associated with the destination identifier.

3. The UE according to claim 1, wherein, The one or more processors are further configured to: Whether to provide feedback for each sidelink transmission is determined at least in part based on whether each of the plurality of sidelink transmissions is within a threshold range and whether feedback is enabled for each sidelink transmission.

4. The UE according to claim 1, wherein, The one or more processors are further configured to: The feedback provided in connection with the plurality of side link transmissions is determined based at least in part on at least one of the following: The broadcast types of the multiple side link transmissions, The region identifiers transmitted by the multiple side links The range requirements for the transmission of the multiple side links, or Regarding the determination that the multiple sidelink transmissions are SDM transmissions of a single packet set.

5. The UE according to claim 1, wherein, The negative acknowledgment of the feedback is located at a resource defined by the time and frequency resources associated with the plurality of sidelink transmissions.

6. The UE according to claim 1, wherein, The instruction is sent on several resource elements (REs) equal to the number of layers on which the at least one side link transmission failed.

7. The UE according to claim 6, wherein, The plurality of REs are selected, at least in part, based on at least one source identifier associated with the at least one sidelink transmission.

8. The UE according to claim 6, wherein, The plurality of REs are selected at least in part based on the number of layers on which the at least one side link transmission failed and the maximum number of layers supported by the UE.

9. The UE according to claim 8, wherein, The plurality of REs are selected at least in part based on the following: the number of layers on which the at least one sidelink transmission fails, the maximum number of layers supported by the UE, the time resources associated with the at least one sidelink transmission, and the frequency resources associated with the at least one sidelink transmission.

10. The UE according to claim 6, wherein, The indication includes information on each of the plurality of REs indicating whether the UE failed to receive sidelink transmissions at the corresponding layer.

11. A first user equipment (UE) for wireless communication, comprising: Memory; as well as One or more processors operatively coupled to the memory, the one or more processors being configured to: Multiple sidelink transmissions are sent to a second UE, wherein the multiple sidelink transmissions are sent using a spatial division multiplexing (SDM) configuration, the SDM configuration indicating how the multiple sidelink transmissions will be multiplexed spatially; The system receives feedback indicating that it failed to decode at least one of the plurality of sidelink transmissions, wherein the feedback includes an indication of at least one layer of the SDM configuration regarding the at least one sidelink transmission; and The at least one side link transmission is selectively retransmitted, at least in part, based on the feedback. The indication is received in a sidelink feedback channel having a common negative acknowledgment (NACK) corresponding to the plurality of sidelink transmissions, and the indication is received on a resource element in the sidelink feedback channel that is not used by the common NACK.

12. The first UE according to claim 11, wherein, When selectively retransmitting the at least one side link transmission based at least in part on the feedback, the one or more processors are configured to: The at least one layer is identified at least in part based on the set of resource elements (REs) on which the instructions are sent; The communication to be retransmitted is identified at least in part based on the at least one layer; as well as The communication is retransmitted via the at least one layer.

13. The first UE according to claim 12, wherein, The RE set is based at least in part on at least one source identifier associated with the first UE.

14. The first UE according to claim 12, wherein, The RE set is selected at least in part based on the number of layers on which the at least one side link transmission failed and the maximum number of layers supported by the second UE.

15. The first UE according to claim 14, wherein, The RE set is selected based at least in part on the following: the number of layers on which the at least one sidelink transmission fails, the maximum number of layers supported by the second UE, the time resources associated with the at least one sidelink transmission, and the frequency resources associated with the at least one sidelink transmission.

16. The first UE according to claim 12, wherein, The indication includes information on each RE in the RE set indicating whether the second UE failed to receive sidelink transmissions at the corresponding layer.

17. The first UE according to claim 11, wherein, When selectively retransmitting the at least one side link transmission based at least in part on the feedback, the one or more processors are configured to: An appropriate subset of the plurality of sidelink transmissions is retransmitted, at least in part, based on the feedback, which includes instructions for the at least one layer.

18. The first UE according to claim 11, wherein, The first UE is a multiple transmit-receive point (TRP) UE, and the multiple sidelink transmissions are transmitted via the respective TRPs of the first UE.

19. A method for wireless communication performed by a user equipment (UE), comprising: Receive multiple sidelink transmissions, wherein the multiple sidelink transmissions are transmitted using a spatial division multiplexing (SDM) configuration, the SDM configuration indicating how the multiple sidelink transmissions will be multiplexed spatially; Decode the multiple sidelink transmissions; and If at least one of the plurality of sidelink transmissions fails to be decoded, feedback indicating the failure to decode the at least one sidelink transmission is sent, wherein the feedback includes an indication of at least one layer of the SDM configuration regarding the at least one sidelink transmission, and wherein the indication is sent in a sidelink feedback channel having a common negative acknowledgment (NACK) corresponding to the plurality of sidelink transmissions, and wherein the indication is sent on a resource element in the sidelink feedback channel that is not used by the common NACK.

20. The method of claim 19, further comprising: Whether to provide feedback for each sidelink transmission is determined at least in part based on whether each of the plurality of sidelink transmissions is within a threshold range and whether feedback is enabled for each sidelink transmission.

21. The method of claim 19, further comprising: The feedback provided in connection with the plurality of side link transmissions is determined based at least in part on at least one of the following: The broadcast types of the multiple side link transmissions, The region identifiers transmitted by the multiple side links The range requirements for the transmission of the multiple side links, or Regarding the determination that the multiple sidelink transmissions are SDM transmissions of a single packet set.

22. The method according to claim 19, wherein, The indication is sent in a sidelink feedback channel having a common negative acknowledgment (NACK) corresponding to the plurality of sidelink transmissions, and wherein the indication is sent on a plurality of resource elements (REs) equal to the number of layers on which the at least one sidelink transmission has failed.

23. The method according to claim 22, wherein, The indication includes information on each of the plurality of REs indicating whether the UE failed to receive sidelink transmissions at the corresponding layer.

24. A method for wireless communication performed by a first user equipment (UE), comprising: Multiple sidelink transmissions are sent to a second UE, wherein the multiple sidelink transmissions are sent using a spatial division multiplexing (SDM) configuration, the SDM configuration indicating how the multiple sidelink transmissions will be multiplexed spatially; The system receives feedback indicating that it failed to decode at least one of the plurality of sidelink transmissions, wherein the feedback includes an indication of at least one layer of the SDM configuration regarding the at least one sidelink transmission; and The at least one side link transmission is selectively retransmitted, at least in part, based on the feedback. The indication is received in a sidelink feedback channel having a common negative acknowledgment (NACK) corresponding to the plurality of sidelink transmissions, and the indication is received on a resource element in the sidelink feedback channel that is not used by the common NACK.

25. The method according to claim 24, wherein, Selectively retransmitting the at least one sidelink transmission based at least in part on the feedback also includes: The at least one layer is identified at least in part based on the set of resource elements (REs) on which the instructions are sent; Identifying communications to be retransmitted is based at least in part on the at least one layer; and The communication is retransmitted via the at least one layer.

26. The method of claim 25, wherein, The RE set is based at least in part on at least one source identifier associated with the first UE.

27. The method according to claim 25, wherein, The RE set is selected at least in part based on the number of layers on which the at least one side link transmission failed and the maximum number of layers supported by the second UE.

28. The method according to claim 24, wherein, The first UE is a multiple transmit-receive point (TRP) UE, and the multiple sidelink transmissions are transmitted via the respective TRPs of the first UE.

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