Hybrid automatic repeat request codebook enhancements for sidelink mode 1

Abstract

Various aspects of the disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) can receive downlink control information (DCI) indicating that the UE is to retransmit sidelink hybrid automatic repeat request (HARQ) feedback. The UE can retransmit, based at least in part on the DCI, the sidelink HARQ feedback on a physical uplink control channel for one or more sidelink HARQ processes. Numerous other aspects are provided.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This Patent Application claims priority to U.S. Provisional Patent Application No. 63 / 198,056, titled “HYBRID AUTOMATIC REPEAT REQUEST CODEBOOK ENHANCEMENT FOR SIDELINK MODE 1,” filed September 25, 2020; and U.S. Nonprovisional Patent Application No. 17 / 445,447, titled “HYBRID AUTOMATIC REPEAT REQUEST CODEBOOK ENHANCEMENT FOR SIDELINK MODE 1,” filed August 19, 2021, which are expressly incorporated by reference herein. TECHNICAL FIELD

[0003] Aspects of the present disclosure relate generally to wireless communication, and to techniques and apparatuses for hybrid automatic repeat request codebook enhancement for sidelink mode 1. BACKGROUND

[0004] Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcasts. Typical wireless communication systems can employ multiple-access technologies capable of supporting 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 / LTE-Advanced is a set of enhancements to the Universal Mobile Telecommunications System (UMTS) mobile standard promulgated by the Third Generation Partnership Project (3 GPP).

[0005] A wireless network can include a number of base stations (BSs) that can support communication for a number of user equipment (UEs). A UE can communicate with a BS via the downlink and uplink. “Downlink” or “forward link” refers to

[0006] The above multiple access technologies have been adopted in various telecommunication standards to provide common protocol that enables different wireless devices to communicate on a municipal, national, regional, and even global level. NR, which can also be referred to as 5G, is a set of enhancements to the LTE mobile standard promulgated by 3GPP. NR is designed to better support mobile broadband Internet access by improving spectral efficiency, lowering costs, improving services, making use of new spectrum, and better integrating with other open standards using orthogonal frequency division multiplexing (OFDM) with a cyclic prefix (CP) (CP-OFDM) on the downlink (DL), using CP- OFDM and / or SC-FDM (e.g., also known as discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-s-OFDM)) for the uplink (UL), as well as promoting SUMMARY

[0007] In some aspects, a method of wireless communication performed by a user equipment (UE) includes receiving downlink control information (DCI) indicating that the UE is to retransmit sidelink hybrid automatic repeat request (HARQ) feedback; and retransmitting, based at least in part on the DCI, the sidelink HARQ feedback for one or more sidelink HARQ processes on a physical uplink control channel (PUCCH).

[0008] In some aspects, a method of wireless communication performed by a base station includes transmitting, to a UE, DCI indicating that the UE is to retransmit sidelink hybrid automatic repeat request (HARQ) feedback after the sidelink HARQ feedback is dropped; and receiving, based at least in part on transmitting the DCI, the sidelink HARQ feedback for one or more sidelink HARQ processes on a physical uplink control channel (PUCCH).

[0009] In some aspects, a UE for wireless communication includes a memory and one or more processors coupled to the memory, the one or more processors configured to: receive DCI indicating that the UE is to retransmit sidelink hybrid automatic repeat request (HARQ) feedback; and retransmit, based at least in part on the DCI, the sidelink HARQ feedback for one or more sidelink HARQ processes on a physical uplink control channel (PUCCH).

[0010] In some aspects, a base station for wireless communication includes a memory and one or more processors coupled to the memory, the one or more processors configured to: transmit, to a UE, DCI indicating that the UE is to retransmit sidelink hybrid automatic repeat request (HARQ) feedback after the sidelink HARQ feedback is dropped; and receive, based at least in part on transmitting the DCI, the sidelink HARQ feedback for one or more sidelink HARQ processes on a physical uplink control channel (PUCCH).

[0011] 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 DCI indicating that the UE is to retransmit sidelink HARQ feedback; and retransmit, based at least in part on the DCI, sidelink HARQ feedback for one or more sidelink HARQ processes on a PUCCH.

[0012] 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 base station, cause the base station to: transmit, to a UE, DCI indicating that the UE is to retransmit sidelink HARQ feedback after sidelink HARQ feedback is dropped; and receive, based at least in part on transmitting the DCI, sidelink HARQ feedback for one or more sidelink HARQ processes on a PUCCH.

[0013] In some aspects, an apparatus for wireless communication includes means for receiving DCI indicating that the apparatus is to retransmit sidelink HARQ feedback; and means for retransmitting, based at least in part on the DCI, sidelink HARQ feedback for one or more sidelink HARQ processes on a PUCCH.

[0014] In some aspects, an apparatus for wireless communication includes means for transmitting, to a UE, DCI indicating that the UE is to retransmit sidelink HARQ feedback after sidelink HARQ feedback is dropped; and means for receiving, based at least in part on transmitting the DCI, sidelink HARQ feedback for one or more sidelink HARQ processes on a PUCCH.

[0015] Aspects generally include a method, apparatus, system, computer program product, non-transitory computer-readable medium, user equipment, base station, wireless communication device, and / or processing system as substantially described herein with reference to and as illustrated by the drawings and specification.

[0016] The foregoing has outlined rather broadly the features and technical advantages of examples according to the disclosure. Additional features and advantages will be described in connection with the description of the subsequent detailed description. Additional features and advantages will be described hereinafter which form the subject of the claims of the disclosure. The disclosed concepts and specific examples can be readily utilized as bases upon which the other structures can be built employing the principles of this disclosure. Such equivalent constructions do not depart from the scope of the appended claims. The features and advantages of the concepts disclosed herein will become more fully apparent as the description proceeds in connection with the accompanying drawings in which like numerals designate similar parts throughout the several figures of the drawings. The features and advantages of the concepts disclosed herein will become more fully apparent as the description proceeds in connection with the accompanying drawings in which like numerals designate similar parts throughout the several figures of the drawings. Each figure is provided by way of explanation and is used only to provide a understanding of the concepts as claimed. No limitation on the scope of the claims is intended by the inclusion of the figures in the description. BRIEF DESCRIPTION OF DRAWINGS

[0017] For a more complete understanding of the above-described features of the present disclosure, reference is made to the detailed description being taken in connection with the accompanying drawings in which certain aspects are represented. It is noted that the drawings merely represent certain aspects of the present disclosure and are therefore not to be considered limiting of its scope, as the specification can admit to other aspects which are equivalent in nature to those described. Like reference numerals can denote like elements throughout the various drawings.

[0018] Figure 1 FIG. 1 is a diagram illustrating an example of a wireless network according to the present disclosure.

[0019] Figure 2 FIG. 2 is a diagram illustrating an example of a base station in communication with a user equipment (UE) in a wireless network, in accordance with the present disclosure.

[0020] Figure 3 FIG. 3 is a diagram illustrating an example of sidelink communication according to the present disclosure.

[0021] Figure 4 FIG. 4 is a diagram illustrating an example of sidelink communication and access link communication according to the present disclosure.

[0022] Figure 5 FIG. 5 is a diagram illustrating an example of hybrid automatic repeat request codebook enhancements for sidelink mode 1 according to the present disclosure.

[0023] Figure 6 FIG. 6 is a diagram illustrating an example process performed, for example, by a UE, in accordance with the present disclosure.

[0024] Figure 7 FIG. 7 is a diagram illustrating an example process performed, for example, by a base station, in accordance with the present disclosure.

[0025] Figures 8-9 FIG. 8 is a block diagram of an example apparatus for wireless communication in accordance with the present disclosure. DETAILED DESCRIPTION

[0026] 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 given 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 herein, whether implemented independently or in combination with any other aspect of this disclosure. For example, an apparatus or method may be implemented using any number of the aspects set forth herein. Furthermore, the scope of this disclosure is intended to cover apparatuses or methods that are 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 herein may be embodied by one or more components of the invention.

[0027] Now, some aspects of a telecommunications system will be given 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 by 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 overall system.

[0028] It should be noted that although the aspects herein are described using terms commonly associated with 5G or NR radio access technology (RAT), the aspects of this disclosure can be applied to other RATs, such as 3G RAT, 4G RAT and / or RATs after 5G (e.g., 6G).

[0029] Figure 1This is a diagram illustrating an example of a wireless network 100 according to this disclosure. The wireless network 100 may be a 5G (NR) network and / or an LTE network, or may include elements of a 5G (NR) network and / or an LTE network. The 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, or Transmit / Receive Point (TRP). Each BS may provide communication coverage for a specific geographic area. In 3GPP, depending on the context in which the term "cell" is used, the term "cell" may refer to the coverage area of ​​a BS and / or the BS subsystem serving that coverage area.

[0030] 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 a service subscription. A picocell can cover a relatively small geographic area and can allow unrestricted access by UEs with a service subscription. 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 example 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.

[0031] 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 use any suitable transport network to interconnect with each other and / or interconnect to one or more other BSs or network nodes (not shown) in the wireless network 100 via various types of backhaul interfaces (such as direct physical connections or virtual networks).

[0032] 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 send 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, or repeater.

[0033] Wireless network 100 can be a heterogeneous network comprising different types of Base Stations (BSs), such as macro BSs, pico BSs, femto BSs, and / or relay BSs. 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 relay BSs can have lower transmit power levels (e.g., 0.1 to 2 watts).

[0034] 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 directly with each other, or indirectly with each other via wireless or wired backhaul.

[0035] 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 equipment, biosensor / device, wearable device (smartwatch, smart clothing, smart glasses, smart wristband, smart jewelry (e.g., smart ring, smart bracelet)), entertainment device (e.g., music or video device, or satellite radio unit), 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.

[0036] Some UEs can be considered Machine-Type Communication (MTC) UEs or Evolved or Enhanced Machine-Type Communication (eMTC) UEs. For example, MTC and eMTC UEs include, for instance, robots, drones, remote devices, sensors, meters, monitors, and / or location tags that can communicate with a base station, another device (e.g., a remote device), or some other entity. For example, a wireless node can provide connectivity to or from a network (e.g., a wide area network such as the Internet or a cellular network) via a wired or wireless communication link. 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 in a housing that houses the components of UE 120, such as 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, electrically coupled, and / or electronically coupled.

[0037] 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 radio technology and / or air interface. A frequency can also be referred to as a carrier and / or frequency channel. 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.

[0038] 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 device). For example, UE 120 may communicate using peer-to-peer (P2P) communication, device-to-device (D2D) communication, vehicle-to-pedestrian (V2P) protocols, vehicle-to-everything (V2X) protocols (e.g., which may include vehicle-to-vehicle (V2V) protocols or vehicle-to-infrastructure (V2I) protocols), and / or mesh networks. In this case, UE 120 may perform scheduling operations, resource selection operations, and / or other operations described elsewhere herein as being performed by base station 110.

[0039] Devices in the wireless network 100 can communicate using the electromagnetic spectrum, which can be subdivided into various categories, bands, channels, etc., based on frequency or wavelength. For example, devices in the wireless network 100 can communicate using an operating band with a first frequency range (FR1) (FR1 can span from 410 MHz to 7.125 GHz), and / or can communicate using an operating band with a second frequency range (FR2) (FR2 can span from 24.25 GHz to 52.6 GHz). The frequencies between FR1 and FR2 are sometimes referred to as intermediate frequency (IF) frequencies. Although a portion of FR1 is greater than 6 GHz, FR1 is often referred to as the “sub-6 GHz” band. Similarly, FR2 is often referred to as the “millimeter wave” band, although it differs from the extremely high frequency (EHF) band (30 GHz–300 GHz) designated as a “millimeter wave” band by the International Telecommunication Union (ITU). Therefore, unless otherwise explicitly stated, it should be understood that the terms "sub-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," etc. (if used herein), can broadly refer to frequencies within the EHF band, frequencies within FR2, and / or intermediate frequency (e.g., less than 24.25 GHz). Modifications to the frequencies included in FR1 and FR2 are anticipated, and the techniques described herein can be applied to these modified frequency ranges.

[0040] As indicated above, Figure 1 This is provided as an example. Other examples may be provided in conjunction with [the example provided]. Figure 1 The descriptions are different.

[0041] Figure 2 This is a diagram illustrating an example 200 of communication between a base station 110 and a UE 120 in a wireless network 100 according to the present 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.

[0042] At base station 110, transmit 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 the channel quality index (CQI) received from each UE, process the data for each UE (e.g., coding and modulation) based at least in part on the MCS selected for each UE, and provide data symbols for all UEs. Transmit processor 220 can also process system information (e.g., for semi-static resource allocation information (SRPI)) and control information (e.g., CQI requests, grants, upper-layer signaling, etc.), and provide overhead symbols and control symbols. Transmit processor 220 can also generate reference symbols for reference signals (e.g., cell-specific reference signals (CRS), 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) on ​​data symbols, control symbols, overhead symbols, and / or reference symbols (if applicable), and provide T output symbol streams to T modulators (MODs) 232a to 232t. Each modulator 232 can process its corresponding output symbol stream (e.g., for OFDM) 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.

[0043] 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. Each demodulator 254 can condition (e.g., filter, amplify, downconvert, 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 received symbols. 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 the Received Reference Signal Power (RSRP), Received Signal Strength Indicator (RSSI), Received Reference Signal Quality (RSRQ), and / or CQI, etc. In some respects, one or more components of the UE 120 may be included in the housing.

[0044] Network controller 130 may include communication unit 294, controller / processor 290, and memory 292. For example, network controller 130 may include one or more devices in the core network. Network controller 130 may communicate with base station 110 via communication unit 294.

[0045] Antennas (e.g., antennas 234a to 234t and / or antennas 252a to 252r) may include one or more antenna panels, antenna groups, antenna element sets, and / or antenna arrays, etc., or may be included in 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 one or more antenna elements coupled to one or more transmitting and / or receiving components, such as... Figure 2 One or more components.

[0046] On the uplink, at UE 120, transmit 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). Transmit processor 264 can also generate reference symbols for one or more reference signals. Symbols from transmit processor 264 can be pre-encoded (if applicable) by TX MIMO processor 266, further processed by modulators 254a to 254r (e.g., for DFT-s-OFDM, CP-OFDM), and transmitted to base station 110. In some aspects, modulators and demodulators (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 processor (e.g., controller / processor 280) and memory 282 may be used with the transceiver to perform aspects of any of the methods described herein (e.g., as referenced). Figures 3-9 (As described).

[0047] 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 the decoded data to data sink 239 and the decoded control information to controller / processor 240. Base station 110 may include communication unit 244 and can 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, the modulator and demodulator (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 processor (e.g., controller / processor 240) and memory 242 may be used with the transceiver to perform aspects of any of the methods described herein (e.g., as referenced). Figures 3-9 (As described).

[0048] The controller / processor 240 of base station 110, the controller / processor 280 of UE 120 and / or Figure 2 Any other components may execute one or more techniques associated with Hybrid Automatic Repeat Request (HARQ) codebook enhancement for sidelink mode 1, 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 6 Process 600 Figure 7 The operation of process 700 and / or other processes as described herein. Memory 242 and memory 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 6 Process 600 Figure 7 The process 700 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.

[0049] In some aspects, UE 120 includes: a unit for receiving downlink control information (DCI) instructing the UE to retransmit sidelink HARQ feedback; and / or a unit for retransmitting sidelink HARQ feedback for one or more sidelink HARQ procedures on the Physical Uplink Control Channel (PUCCH), at least in part based on the DCI. Units for UE 120 to perform the operations described herein may include, for example, an antenna 252, a demodulator 254, a MIMO detector 256, a receive processor 258, a transmit processor 264, a TX MIMO processor 266, a modulator 254, a controller / processor 280, and / or a memory 282.

[0050] In some aspects, UE 120 includes: a unit for transmitting a new data indicator (NDI) for each corresponding sidelink HARQ procedure in one or more sidelink HARQ procedures.

[0051] In some aspects, base station 110 includes: a unit for transmitting a DCI to the UE, the DCI instructing the UE to retransmit the sidelink HARQ feedback after it has been discarded; and / or a unit for receiving sidelink HARQ feedback on the PUCCH for one or more sidelink HARQ procedures, at least in part based on the transmitted DCI. Units for base station 110 to perform the operations described herein may include, for example, a transmit processor 220, a TX MIMO processor 230, a modulator 232, an antenna 234, a demodulator 232, a MIMO detector 236, a receive processor 238, a controller / processor 240, a memory 242, and / or a scheduler 246.

[0052] In some aspects, base station 110 includes: a unit for transmitting a trigger for reporting only type 3 codebooks in the frequency domain resource allocation field of the DCI.

[0053] In some aspects, base station 110 includes: a unit for transmitting parameters for Type 3 codebook control in a radio resource control message, wherein the parameters indicate that the UE will transmit the sidelink HARQ feedback concatenated with or multiplexed in the Type 3 codebook for the Uu interface, wherein receiving the sidelink HARQ feedback includes: receiving the sidelink HARQ feedback concatenated with or multiplexed in the Type 3 codebook for the Uu interface.

[0054] Although Figure 2 The boxes in the diagram are shown as different components, but the functionality 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 functionality 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 indicated above, Figure 2 This is provided as an example. Other examples may be provided in conjunction with [the example provided]. Figure 2 The descriptions are different.

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

[0057] like Figure 3As 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. UE 305-1 and UE 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, UE 305 (e.g., UE 305-1 and / or UE 305-2) can correspond to one or more other UEs (e.g., UE 120) described elsewhere herein. In some aspects, one or more sidelink channels 310 can use a PC5 interface and / or can operate in a high-frequency band (e.g., the 5.9 GHz band). Additionally or alternatively, UE 305 can 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 Sidelink Control Channel (PSCCH) 315, a Physical Sidelink Shared Channel (PSSCH) 320, and / or a Physical Sidelink Feedback Channel (PSFCH) 325. PSCCH 315 may be used to transmit control information, similar to a Physical Downlink Control Channel (PDCCH) and / or a PUCCH used for cellular communication with base station 110 via an access link or access channel. PSSCH 320 may be used to transmit data, similar to a Physical Downlink Shared Channel (PDSCH) and / or a Physical Uplink Shared Channel (PUSCH) used for cellular communication with base station 110 via an access link or access channel. For example, PSCCH 315 may carry sidelink control information (SCI) 330, which may indicate various control information for sidelink communication, such as one or more resources (e.g., time resources, frequency resources, spatial resources, etc.), wherein a transport block (TB) 335 may be carried on PSCCH 320. TB 335 may include data. PSFCH 325 can be used to transmit side-link feedback 340, such as HARQ feedback (e.g., ACK / NACK information), transmit power control (TPC), scheduling request (SR), etc.

[0059] In some aspects, one or more sidelink channels 310 may use a resource pool. For example, a scheduling allocation may be transmitted in a subchannel using a specific resource block (RB) spanning a time period (e.g., included in SCI 330). In some aspects, data transmission associated with a scheduling allocation (e.g., on PSSCH 320) may occupy adjacent RBs in the same subframe as the scheduling allocation (e.g., using frequency division multiplexing). In some aspects, the scheduling allocation and associated data transmission are not transmitted on adjacent RBs.

[0060] In some aspects, UE 305 may operate using a transmission mode referred to as sidelink mode 2, where resource selection and / or scheduling is performed by UE 305 (e.g., rather than base station 110 in sidelink mode 1). In some aspects, UE 305 may perform resource selection and / or scheduling by sensing the transmission availability of 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, SCI 330 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, 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 the transport mode (sidelink mode 2) in which UE 305 performs resource selection and / or scheduling, 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) to be used for an upcoming sidelink transmission, such as one or more resource blocks (e.g., for TB 335) to be used for an upcoming sidelink transmission on PSSCH 320, one or more subframes to be used for an upcoming sidelink transmission, modulation and coding scheme (MCS) to be used for an upcoming sidelink transmission, etc. In some aspects, UE 305 can generate sidelink grants indicating one or more parameters (e.g., periodicity of sidelink transmission) for semi-persistent scheduling (SPS). Additionally or alternatively, UE 305 can generate sidelink grants for event-driven scheduling, such as for on-demand sidelink messages.

[0063] As indicated above, Figure 3 This is provided as an example. Other examples may be provided in conjunction with [the example provided]. Figure 3 The descriptions are different.

[0064] Figure 4 This is a diagram illustrating example 400 of sidelink communication and access link communication according to 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. Additionally or alternatively, in some sidelink modes (e.g., sidelink mode 1), 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 1The direct link between UE 405 and UE 410 (e.g., via the PC5 interface) can be referred to as a sidelink, and the direct link between base station 110 and UE 405 (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 405) or uplink communication (from UE 405 to base station 110). UE 405 can use a Type 3 codebook triggered by bits added via DCI 1_1 to report ACK or NACK for all configured HARQ procedures for the Uu interface. The Type 3 codebook can be used to map data to antennas and / or physical channels to provide more accurate feedback than Type I or Type II codebooks. UE 405 can also utilize ACK or NACK to report NDI for each HARQ procedure.

[0066] In sidelink mode 1, base station 110 specifies resources for UE 405 to send sidelink communication to UE 410 via a DCI on the access link. Base station 110 may send a DCI to schedule sidelink communication and indicate HARQ feedback reporting timing (e.g., a timing value k for the duration between receiving the DCI and sending the HARQ feedback). Base station 110 may indicate resource indicators for PSFCH resources, and the sidelink HARQ feedback reported by UE 405 may depend on the PSFCH resources specified by base station 110. Base station 110 may configure a type 1 sidelink configuration grant (CG) and send Radio Resource Control (RRC) parameters, including parameters indicating the timing for sidelink HARQ feedback (e.g., sl-ACKtoUL-ACK). Base station 110 may configure a type 2 sidelink CG, and activating DCI3_0 can provide timing for sidelink HARQ feedback. UE 410 can send sidelink HARQ feedback (ACK or NACK) for sidelink communication to UE 405, and UE 405 can report the sidelink HARQ feedback to base station 110. The sidelink HARQ feedback can be multiplexed into the codebook reported on PUCCH or PUSCH. However, if there is a conflict between sidelink HARQ feedback, uplink communication (e.g., on the Uu interface), and / or HARQ feedback for uplink communication, there is a mechanism to discard the sidelink HARQ feedback, uplink communication, and / or HARQ feedback for the Uu interface.

[0067] Mechanisms for discarding communications or HARQ feedback may involve prioritizing sidelink HARQ feedback, uplink communications, and / or HARQ feedback for uplink communications. A priority value of 0 indicates the highest priority, and 1 indicates the next highest priority. If uplink communication with a priority value of 1 (e.g., for Ultra-Reliable Low-Latency Communication (URLLC)) is to be sent, UE 405 may send sidelink HARQ feedback if the priority value of the sidelink HARQ feedback is lower than a specific threshold for URLLC (e.g., sl-PriorityThresholdULURLLC) (higher priority). Otherwise, UE 405 may send uplink communication and discard the sidelink HARQ feedback. The priority value of uplink communication 1 is a higher priority than the priority value of sidelink HARQ feedback 2. UE 405 may determine to send uplink communication with a priority value of 0 for enhanced mobile broadband (eMBB). If the sidelink HARQ feedback has a lower priority value than the sidelink priority threshold (e.g., sl-PriorityThreshold), UE 405 may send the sidelink HARQ feedback. Otherwise, UE 405 may send uplink communication with a priority value of 0. In summary, base station 110 can use RRC configuration to prioritize uplink transmissions / HARQ feedback (URLLC or eMBB) on PUCCH / PUSCH and sidelink HARQ feedback on PUCCH. In some configurations, UE 405 may discard the sidelink HARQ feedback. If the sidelink HARQ feedback is discarded (not sent as scheduled), base station 110 may not receive sidelink HARQ feedback regarding whether the sidelink communication was successfully received and decoded. If the sidelink HARQ feedback is never retransmitted, base station 110 may not know that the sidelink communication sent by UE 405 to UE 410 (in sidelink mode 1) failed, and the communication may be degraded. As a result, UE 405 wastes power, processing resources, and signaling resources on sidelink resources where transmission failed.

[0068] As indicated above, Figure 4 This is provided as an example. Other examples can be found in the source material. Figure 4 The descriptions are different.

[0069] Figure 5 This is a diagram illustrating example 500 of a HARQ codebook enhancement for side-link mode 1 according to the present disclosure. Figure 5 As shown, Example 500 includes BS 510 (e.g., Figure 1 and 2 The BS 110 and UE 520 (as depicted in the text) Figure 1and 2 Communication between UE 120 (as depicted in the diagram). In some aspects, a wireless network (such as wireless network 100) may include BS 510 and UE 520. BS 510 and UE 520 may communicate on a radio access link, which may include an uplink and a downlink on a Uu interface. Figure 5 It is also shown that UE 520 can communicate with UE 530 on the sidelink in sidelink mode 1, wherein BS 510 specifies the sidelink channel resources for transmitting sidelink communication.

[0070] Based on the aspects described herein, the UE can recover dropped sidelink HARQ feedback by retransmitting it. For example, the base station can instruct the UE to retransmit sidelink HARQ feedback in the DCI by including one or more bits in DCI format 3_0 to trigger the retransmission of sidelink HARQ feedback. The UE can multiplex the ACK or NACK for each HARQ procedure in one or more HARQ procedures for sidelink communication on the sidelink into a sidelink HARQ ACK codebook and retransmit the sidelink HARQ ACK codebook to the base station scheduling the sidelink communication. The base station can then adjust the scheduling of sidelink communication based on the sidelink HARQ feedback. As a result, the UE saves power, processing resources, and signaling resources that would otherwise be wasted due to failed sidelink communication transmissions.

[0071] As indicated by reference numeral 540, UE 520 receives a DCI instructing UE 520 to retransmit the sidelink HARQ feedback. The DCI may include bits of DCI format 3_0 to trigger the sidelink HARQ feedback retransmission. BS 510 can configure UE 520 to send NDI for each corresponding HARQ procedure.

[0072] The sidelink HARQ ACK codebook can be a Type 3 codebook configured separately from any Type 3 HARQ ACK codebook used for the Uu interface. The Type 3 codebook can have the same priority value as the lowest priority value across all HARQ procedures. In some aspects, the DCI may not include valid sidelink resource permission, making the DCI primarily used to instruct the UE 520 to report only the Type 3 codebook. The DCI used to signal only Type 3 codebook reporting can use a special combination of the Frequency Domain Resource Allocation (FDRA) fields in the DCI (e.g., the field is all 1s). The DCI can also indicate a timing value k for the duration between the DCI and the sidelink HARQ feedback. Retransmitting sidelink HARQ feedback using a Type 3 codebook is a codebook enhancement for sidelink HARQ in sidelink mode 1, providing greater reliability for sidelink communication.

[0073] Example 500 relates to sidelink mode 1, and therefore BS 510 can configure UE 520 for CG sidelink transmission, or use DCI to schedule UE 520 to use physical sidelink channel resources to send sidelink communication. As shown by reference numeral 545, UE 520 can send sidelink communication. UE 530 can determine whether the sidelink communication was successful. If so, UE 530 can send a HARQ ACK to UE 520 as sidelink HARQ feedback. Otherwise, UE 530 can send a HARQ NACK to UE 520 as sidelink HARQ feedback. ACK or NACK can be multiplexed into the sidelink HARQ codebook. As shown by reference numeral 550, UE 520 can receive sidelink HARQ feedback.

[0074] In some scenarios, BS 510 may not receive sidelink HARQ feedback from UE 520. UE 520 may have already sent sidelink HARQ feedback to BS 510, but BS 510 did not receive it. In some scenarios, UE 520 may have discarded the sidelink HARQ feedback due to higher priority communication, as shown by reference numeral 555. As shown by reference numeral 560, UE 520 may buffer the sidelink HARQ feedback for later retransmission. Based at least in part on the DCI indicating sidelink HARQ retransmission, UE 520 may retransmit the sidelink HARQ feedback to BS 510, as shown by reference numeral 565. UE 520 may send sidelink HARQ feedback multiplexed in a sidelink HARQ ACK codebook (which may be a type 3 codebook).

[0075] In some aspects, UE 520 can transmit sidelink HARQ feedback as well as HARQ feedback for the Uu interface (for communication on the physical channel between BS 510 and UE 520). For example, sidelink HARQ feedback can be concatenated or multiplexed with HARQ feedback for the Uu interface in a HARQ ACK codebook, which can be a Type 3 codebook for the Uu interface. Transmission of the HARQ ACK codebook for the Uu interface can be triggered by bits in DCI 1_1. HARQ feedback for the Uu interface can be for HARQ procedures for multiple component carriers (CCs) (e.g., for all CCs), and sidelink HARQ feedback can be for one or more HARQ procedures on one or more sidelink CCs.

[0076] BS 510 can use RRC parameters for Type 3 HARQ codebook control to instruct UE 520 to include sidelink HARQ feedback and HARQ feedback for the Uu interface in the HARQ ACK codebook. UE 520 can control the inclusion of NDI for sidelinks individually or jointly with the inclusion of NDI for the Uu interface HARQ procedure. That is, NDI can indicate each sidelink HARQ procedure and / or each Uu interface HARQ procedure. Sidelink HARQ feedback can be treated as follows: in scenarios with carrier aggregation, sidelink HARQ feedback is HARQ feedback for different Uu interfaces. Concatenating or multiplexing sidelink HARQ feedback with HARQ feedback for the Uu interface in the Type 3 codebook is a codebook enhancement that improves the efficiency of reporting HARQ feedback to BS510.

[0077] As indicated above, Figure 5 This is provided as an example. Other examples may be provided in conjunction with [the example provided]. Figure 5 The descriptions are different.

[0078] Figure 6 This is a diagram illustrating an example procedure 600 performed by a UE, for example, according to this disclosure. Example procedure 600 is a UE (e.g., Figures 1-2 The UE 120 depicted in the text Figure 3 The UE 305-1 depicted in the text Figure 4 UE 405 as depicted in the text Figure 5 The example depicted is of a UE 520 performing operations associated with HARQ codebook enhancements for side link mode 1.

[0079] like Figure 6 As shown, in some aspects, process 600 may include: receiving a DCI (block 610) instructing the UE to retransmit the relink-side HARQ feedback. For example, the UE may (e.g., using...) Figure 8 The receiving component 802 described herein receives the DCI indicating that the UE will retransmit the side-link HARQ feedback, as described above.

[0080] like Figure 6 As further shown, in some aspects, process 600 may include: retransmitting sidelink HARQ feedback for one or more sidelink HARQ procedures on the PUCCH, at least in part based on DCI (box 620). For example, the UE may (e.g., using...) Figure 8 The transmission component 804 and / or retransmission component 808 described herein are at least partially based on DCI, and retransmit sidelink HARQ feedback for one or more sidelink HARQ procedures on the PUCCH as described above.

[0081] Process 600 may include additional aspects, such as any single aspect or any combination thereof described above and / or in conjunction with one or more other process descriptions described elsewhere in this document.

[0082] In the first aspect, the DCI includes bits with DCI format 3_0 for triggering retransmissions of the side link HARQ feedback.

[0083] In the second aspect, either alone or in combination with the first aspect, for each sidelink HARQ procedure in one or more sidelink HARQ procedures, the sidelink HARQ feedback includes a HARQ ACK or NACK multiplexed into the sidelink HARQ ACK codebook.

[0084] In a third aspect, either alone or in combination with one or more of the first and second aspects, process 600 includes: sending an NDI for each corresponding sidelink HARQ process in one or more sidelink HARQ processes.

[0085] In the fourth aspect, either alone or in combination with one or more of the first to third aspects, the sidelink HARQ ACK codebook is a type 3 codebook.

[0086] In the fifth aspect, either alone or in combination with one or more of the first to fourth aspects, the priority of the Type 3 codebook is the same as the highest priority of all sidelink HARQ processes across one or more sidelink HARQ processes.

[0087] In the sixth aspect, retransmitting the sidelink HARQ feedback, either alone or in combination with one or more of the first to fifth aspects, includes retransmitting the sidelink HARQ feedback after receiving a trigger in the DCI for reporting only the type 3 codebook, without requiring valid sidelink permission.

[0088] In the seventh aspect, either alone or in combination with one or more of the first to sixth aspects, the triggering for reporting only the type 3 codebook is indicated by a special combination of the FDRA fields in the DCI.

[0089] In the eighth aspect, retransmitting the sidelink HARQ feedback, either alone or in combination with one or more of the first to seventh aspects, includes: concatenating or multiplexing the sidelink HARQ feedback with the HARQ feedback for the Uu interface in a type 3 codebook for the Uu interface, and transmitting the type 3 codebook for the Uu interface.

[0090] In the ninth aspect, either alone or in combination with one or more aspects from the first to the eighth aspects, the DCI is in DCI format 1_1.

[0091] In the tenth aspect, either alone or in combination with one or more aspects from the first to the ninth aspect, sidelink HARQ feedback is used for multiple sidelink CCs.

[0092] In the eleventh aspect, either alone or in combination with one or more of the first to tenth aspects, transmitting a Type 3 codebook for the Uu interface with sidelink HARQ feedback comprises: transmitting a Type 3 codebook for the Uu interface with sidelink HARQ feedback based at least in part on parameters received in a radio resource control message for Type 3 codebook control.

[0093] Although Figure 6 The example box of process 600 is shown, but in some aspects, process 600 may include... Figure 6 The boxes described herein are compared to additional boxes, fewer boxes, different boxes, or boxes with different arrangements. Alternatively, two or more boxes in the boxes of process 600 may be executed in parallel.

[0094] Figure 7 This is a diagram illustrating an example process 700 performed, for example, by a base station according to this disclosure. Example process 700 is performed by a base station (e.g., Figures 1-2 Base station 110 described in section 4 Figure 5 The example depicted in the text shows the BS 510 performing operations associated with the Hybrid Automatic Repeat Request Codebook Enhancement for Side Link Mode 1.

[0095] like Figure 7 As shown, in some aspects, process 700 may include: sending a DCI to the UE, the DCI instructing the UE to retransmit the sidelink HARQ feedback after it has been discarded (box 710). For example, the base station may (e.g., using...) Figure 9 The transmission component 904 depicted sends a DCI to the UE, which instructs the UE to retransmit the sidelink HARQ feedback after it has been discarded, as described above.

[0096] like Figure 7 As further shown, in some aspects, process 700 may include: receiving sidelink HARQ feedback on the PUCCH for one or more sidelink HARQ procedures, at least in part based on the transmitted DCI (box 720). For example, the base station may (e.g., using...) Figure 9 The receiving component 902 described herein receives, at least in part, sidelink HARQ feedback on the PUCCH for one or more sidelink HARQ procedures, as described above, based on the transmitting DCI.

[0097] Process 700 may include additional aspects, such as any single aspect or any combination thereof described above and / or in conjunction with one or more other process descriptions described elsewhere in this document.

[0098] In the first aspect, the DCI includes bits with DCI format 3_0 for triggering retransmissions of the side link HARQ feedback.

[0099] In the second aspect, either alone or in combination with the first aspect, for each sidelink HARQ procedure in one or more sidelink HARQ procedures, the sidelink HARQ feedback includes a HARQ ACK or NACK multiplexed into the sidelink HARQ ACK codebook.

[0100] In the third aspect, either alone or in combination with one or more of the first and second aspects, the sidelink HARQ ACK codebook is a type 3 codebook.

[0101] In the fourth aspect, either alone or in combination with one or more of the first to third aspects, process 700 includes: sending a trigger for reporting only type 3 codebooks in the FDRA field of the DCI.

[0102] In the fifth aspect, receiving sidelink HARQ feedback, either alone or in combination with one or more of the first to fourth aspects, includes: receiving sidelink HARQ feedback concatenated with or multiplexed with HARQ feedback for the Uu interface in a type 3 codebook for the Uu interface, and the DCI is DCI format 1_1.

[0103] In a sixth aspect, either alone or in combination with one or more of the first to fifth aspects, process 700 includes: transmitting parameters for Type 3 codebook control in a radio resource control message, wherein the parameters indicate that the UE will transmit sidelink HARQ feedback concatenated with or multiplexed in a Type 3 codebook for the Uu interface, and receiving sidelink HARQ feedback includes: receiving sidelink HARQ feedback concatenated with or multiplexed in a Type 3 codebook for the Uu interface.

[0104] Although Figure 7 An example box of process 700 is shown, but in some aspects, process 700 may include... Figure 7 The boxes described herein are compared to additional boxes, fewer boxes, different boxes, or boxes with different arrangements. Alternatively, two or more boxes in the boxes of process 700 may be executed in parallel.

[0105] Figure 8This is a diagram of an example device 800 for wireless communication. Device 800 may be a UE (e.g., UE 120, UE 405, UE 520), or a UE may include device 800. In some aspects, device 800 includes a receiving component 802 and a transmitting component 804, which can communicate with each other (e.g., via one or more buses and / or one or more other components). As shown, device 800 can use the receiving component 802 and the transmitting component 804 to communicate with another device 806 (e.g., a UE, a base station, or another wireless communication device). As further shown, device 800 may include a retransmission component 808, etc.

[0106] In some respects, device 800 can be configured to perform the functions described herein. Figures 1-5 The one or more operations described herein. Alternatively or concurrently, the device 800 may be configured to perform one or more processes described herein, such as... Figure 6 The process 600. In some aspects, the apparatus 800 and / or Figure 8 One or more components shown may include the combination described above. Figure 2 One or more components of the described UE. Alternatively or in combination... Figure 2 Implemented in one or more of the described components Figure 8 One or more components are shown. Alternatively or additionally, 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.

[0107] Receiver 802 may receive communications from device 806, such as reference signals, control information, data communications, or combinations thereof. Receiver 802 may provide the received communications to one or more other components of device 800. In some aspects, receiver 802 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), and may provide the processed signal to one or more other components of device 806. In some aspects, receiver 802 may include the above-described combinations. Figure 2 The described UE includes one or more antennas, demodulators, MIMO detectors, receiver processors, controllers / processors, memory, or combinations thereof.

[0108] The transmission component 804 can send communications, such as reference signals, control information, data communications, or combinations thereof, to the device 806. In some aspects, one or more other components in the device 806 can generate communications and provide the generated communications to the transmission component 804 for transmission to the device 806. In some aspects, the transmission component 804 can perform signal processing (such as filtering, amplification, modulation, digital-to-analog conversion, multiplexing, interleaving, mapping, or encoding) on ​​the generated communications and can send the processed signals to the device 806. In some aspects, the transmission component 804 may include the above-described combinations. 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 804 may be co-located with the receive component 802 in a transceiver.

[0109] The receiving component 802 can receive a DCI indicating that the UE will retransmit the sidelink HARQ feedback. The retransmission component 808 can, at least in part, retransmit the sidelink HARQ feedback for one or more sidelink HARQ procedures on the PUCCH based on the DCI. The retransmission component 808 may include the above-described combination... Figure 2 The described UE includes a modulator, transmit MIMO processor, transmit processor, controller / processor, memory, or a combination thereof. The retransmission component 808 may employ the transmission component 804. The transmission component 804 may transmit NDI for each corresponding sidelink HARQ procedure in one or more sidelink HARQ procedures.

[0110] Figure 8 The number and arrangement of components shown are provided as an example. In practice, different arrangements may exist. Figure 8 Compared to additional components, fewer components, different components, or components with different arrangements, those components in the text. Furthermore, Figure 8 The two or more components shown can be implemented in a single component, or Figure 8 The single component shown can be implemented as multiple distributed components. Alternatively, Figure 8 The component collection shown (e.g., one or more components) can perform actions described as being performed by Figure 8 The other set of components shown performs one or more functions.

[0111] Figure 9This is a block diagram of an example device 900 for wireless communication. Device 900 may be a base station (e.g., BS 110, BS 510), or a base station may include device 900. In some aspects, device 900 includes a receiving component 902 and a transmitting component 904, which can communicate with each other (e.g., via one or more buses and / or one or more other components). As shown, device 900 can use the receiving component 902 and the transmitting component 904 to communicate with another device 906 (e.g., a UE, a base station, or another wireless communication device). As further shown, device 900 may include a codebook component 908, etc.

[0112] In some respects, device 900 can be configured to perform the functions described herein. Figures 1-5 The one or more operations described herein. Alternatively or concurrently, the apparatus 900 may be configured to perform one or more processes described herein, such as... Figure 7 The process 700. In some aspects, the apparatus 900 and / or Figure 9 One or more components shown may include the combination described above. Figure 2 One or more components of the described base station. Alternatively or alternatively, may be combined with the above. Figure 2 Implemented in one or more of the described components Figure 9 One or more components are shown. Alternatively or additionally, 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.

[0113] Receiver 902 may receive communications from device 906, such as reference signals, control information, data communications, or combinations thereof. Receiver 902 may provide the received communications to one or more other components of device 900. In some aspects, receiver 902 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), and may provide the processed signal to one or more other components of device 906. In some aspects, receiver 902 may include the above-described combinations. Figure 2 The described base station includes one or more antennas, demodulators, MIMO detectors, receiver processors, controllers / processors, memory, or combinations thereof.

[0114] The transmission component 904 can send communications, such as reference signals, control information, data communications, or combinations thereof, to the device 906. In some aspects, one or more other components in the device 906 can generate communications and provide the generated communications to the transmission component 904 for transmission to the device 906. In some aspects, the transmission component 904 can perform signal processing (such as filtering, amplification, modulation, digital-to-analog conversion, multiplexing, interleaving, mapping, or encoding) on ​​the generated communications and can send the processed signals to the device 906. In some aspects, the transmission component 904 may include the above-described combinations. Figure 2 The described base station includes one or more antennas, modulators, transmit MIMO processors, transmit processors, controllers / processors, memory, or combinations thereof. In some aspects, the transmit component 904 may be co-located with the receive component 902 in a transceiver.

[0115] Transmitting component 904 can send a DCI to the UE, the DCI instructing the UE to retransmit the sidelink HARQ feedback after it has been discarded. Receiving component 902 can receive sidelink HARQ feedback on the PUCCH for one or more sidelink HARQ procedures, at least in part based on the transmitted DCI.

[0116] Codebook component 908 can send a trigger for reporting only type 3 codebooks in the frequency domain resource allocation field of the DCI. Codebook component 908 can include the above-mentioned combination Figure 2 The described base station includes one or more antennas, modulators, transmit MIMO processors, transmit processors, controllers / processors, memory, or combinations thereof. Codebook component 908 may employ transmission component 904.

[0117] The codebook component 908 can send parameters for Type 3 codebook control in a radio resource control message, wherein the parameters indicate that the UE will send sidelink HARQ feedback concatenated with or multiplexed in the Type 3 codebook for the Uu interface, and the receiving component 902 can receive sidelink HARQ feedback concatenated with or multiplexed in the Type 3 codebook for the Uu interface.

[0118] Figure 9 The number and arrangement of components shown are provided as an example. In practice, different arrangements may exist. Figure 9 Compared to additional components, fewer components, different components, or components with different arrangements, those components in the text. Furthermore, Figure 9 The two or more components shown can be implemented in a single component, or Figure 9 The single component shown can be implemented as multiple distributed components. Alternatively, Figure 9The component collection shown (e.g., one or more components) can perform actions described as being performed by Figure 9 The other set of components shown performs one or more functions.

[0119] Below is an overview of some aspects of this disclosure.

[0120] Aspect 1: A method of wireless communication performed by a user equipment (UE), comprising: receiving downlink control information (DCI) instructing the UE to retransmit a sidelink hybrid automatic repeat request (HARQ) feedback; and retransmitting, at least in part, a sidelink HARQ feedback for one or more sidelink HARQ procedures on a physical uplink control channel (PUCCH) based on the DCI.

[0121] Aspect 2: According to the method of aspect 1, wherein the DCI includes bits having DCI format 3_0 for triggering retransmission of side link HARQ feedback.

[0122] Aspect 3: According to the method of aspect 1 or 2, wherein, for each sidelink HARQ procedure in one or more sidelink HARQ procedures, the sidelink HARQ feedback includes a HARQ acknowledgment (ACK) or negative acknowledgment (NACK) multiplexed into the sidelink HARQ ACK codebook.

[0123] Aspect 4: The method according to aspect 3 further includes: sending a new data indicator for each corresponding sidelink HARQ process in one or more sidelink HARQ processes.

[0124] Aspect 5: The method described in aspect 3 or 4, wherein the side-link HARQ ACK codebook is a type 3 codebook.

[0125] Aspect 6: According to the method of aspect 5, wherein the priority of the type 3 codebook is the same as the highest priority of all sidelink HARQ processes across one or more sidelink HARQ processes.

[0126] Aspect 7: The method according to aspect 5 or 6, wherein the retransmission-side traversal HARQ feedback includes: receiving retransmission-side traversal HARQ feedback in the DCI after a trigger for reporting only the type 3 codebook is received, without requiring valid side traversal permission.

[0127] Aspect 8: According to the method described in aspect 7, the trigger for reporting only type 3 codebooks is indicated by a special combination of frequency domain resource allocation fields in the DCI.

[0128] Aspect 9: The method according to any one of Aspects 1-8, wherein the retransmission side link HARQ feedback comprises: concatenating or multiplexing the side link HARQ feedback with the HARQ feedback for the Uu interface in a Type 3 codebook for the Uu interface, and transmitting the Type 3 codebook for the Uu interface.

[0129] Aspect 10: The method described in aspect 9, wherein the DCI is DCI format 1_1.

[0130] Aspect 11: The method according to aspect 9 or 10, wherein the side-link HARQ feedback is used for multiple side-link component carriers (CCs).

[0131] Aspect 12: The method according to any one of Aspects 9-11, wherein transmitting a Type 3 codebook for the Uu interface with side-link HARQ feedback comprises: transmitting a Type 3 codebook for the Uu interface with side-link HARQ feedback based at least in part on parameters received in a radio resource control message for Type 3 codebook control.

[0132] Aspect 13, a method of wireless communication performed by a base station, comprising: sending downlink control information (DCI) to a user equipment (UE), the DCI instructing the UE to retransmit a sidelink HARQ feedback after a sidelink hybrid automatic repeat request (HARQ) feedback has been discarded; and receiving, at least in part based on the transmission of the DCI, sidelink HARQ feedback for one or more sidelink HARQ procedures on a physical uplink control channel (PUCCH).

[0133] Aspect 14: The method according to aspect 13, wherein the DCI includes bits having DCI format 3_0 for triggering retransmission of side link HARQ feedback.

[0134] Aspect 15: The method according to aspect 13 or 14, wherein, for each sidelink HARQ procedure in one or more sidelink HARQ procedures, the sidelink HARQ feedback includes a HARQ acknowledgment (ACK) or negative acknowledgment (NACK) multiplexed into the sidelink HARQ ACK codebook.

[0135] Aspect 16: According to the method described in aspect 15, wherein the side-link HARQ ACK codebook is a type 3 codebook.

[0136] Aspect 17: The method according to aspect 16 further includes: sending a trigger for reporting only type 3 codebooks in the frequency domain resource allocation field of the DCI.

[0137] Aspect 18: The method according to aspect 16 or 17, wherein receiving side link HARQ feedback includes: receiving side link HARQ feedback concatenated or multiplexed with HARQ feedback for the Uu interface in a type 3 codebook for the Uu interface, and wherein the DCI is DCI format 1_1.

[0138] Aspect 19: The method according to any one of Aspects 16-18 further comprises: transmitting parameters for Type 3 codebook control in a radio resource control message, wherein the parameters indicate that the UE will transmit sidelink HARQ feedback concatenated with or multiplexed in a Type 3 codebook for the Uu interface, wherein receiving sidelink HARQ feedback includes: receiving sidelink HARQ feedback concatenated with or multiplexed in a Type 3 codebook for the Uu interface.

[0139] Aspect 20: 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 1-19.

[0140] Aspect 21: An apparatus for wireless communication, comprising a memory and one or more processors coupled to the memory, the one or more processors being configured to perform the method according to one or more aspects of aspects 1-19.

[0141] Aspect 22: An apparatus for wireless communication, comprising at least one unit for performing the method according to one or more of aspects 1-19.

[0142] Aspect 23: 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 1-19.

[0143] Aspect 24: 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 1-19.

[0144] The above 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 can be made based on the above disclosure, or from various forms of practice.

[0145] As used herein, the term "component" is intended to be interpreted broadly as hardware, firmware, and / or a combination of hardware and software. Whether referred to as software, firmware, middleware, microcode, hardware description language, or other terms, "software" should be interpreted broadly as instructions, instruction sets, code, code segments, program code, programs, subroutines, software modules, application programs, software applications, software packages, routines, subroutines, objects, executable files, threads of execution, procedures, and / or functions, etc. As used herein, a processor is implemented as hardware, firmware, and / or a combination of hardware and software.

[0146] It will be apparent that the systems and / or methods described herein can be implemented in various forms of hardware, firmware, and / or combinations of hardware and software. The actual dedicated control hardware or software code used to implement these systems and / or methods is not a limitation in any respect. Therefore, the operation and performance of these systems and / or methods are described without reference to specific software code, and it is to be understood that the software and hardware can be designed to implement these systems and / or methods, at least in part, based on the descriptions herein.

[0147] 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.

[0148] Although specific combinations of features are recited in the claims and / or disclosed in the specification, these combinations are not intended to limit the disclosure of the aspects. In fact, many of these features can be combined in ways not specifically stated in the claims and / or not disclosed in the specification. While each dependent claim listed below directly depends on only one claim, the disclosure of the aspects includes each dependent claim as well as every other claim item in the claim set. As used herein, the phrase “at least one of” refers to any combination of these items, including individual members. For example, “at least one of a, b, or c” is intended to cover a, b, c, ab, ac, bc, and abc, and any combination having 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).

[0149] The elements, actions, or instructions used herein should not be construed as essential or necessary 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 by the article “the” and may be used interchangeably with “one or more.” Furthermore, as used herein, the terms “collection” and “group” are intended to include one or more items (e.g., related items, unrelated items, 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 terminology is used. Furthermore, as used herein, the terms “have,” “possess,” “contain,” and similar terms are intended to be open-ended terms. Furthermore, the phrase “based on” is intended to mean “at least partially based on” unless otherwise explicitly stated. 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 explicitly 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 coupled to the memory are configured to: Receive downlink control information (DCI) instructing the UE to retransmit the sidelink hybrid automatic repeat request (HARQ) feedback after it has been discarded; and Based at least in part on the DCI, after the sidelink HARQ feedback for the sidelink communication is discarded, the sidelink HARQ feedback for one or more sidelink HARQ procedures is retransmitted on the Physical Uplink Control Channel (PUCCH).

2. The UE according to claim 1, wherein, The DCI includes bits with DCI format 3_0 for triggering retransmissions of the side link HARQ feedback.

3. The UE according to claim 1, wherein, For each sidelink HARQ procedure in the one or more sidelink HARQ procedures, the sidelink HARQ feedback includes a HARQ acknowledgment (ACK) or a negative acknowledgment (NACK) multiplexed into the sidelink HARQ ACK codebook.

4. The UE according to claim 3, wherein, The one or more processors are configured to send a new data indicator for each corresponding sidelink HARQ procedure in the one or more sidelink HARQ procedures.

5. The UE according to claim 3, wherein, The sidelink HARQ ACK codebook is a type 3 codebook.

6. The UE according to claim 5, wherein, The priority of the type 3 codebook is the same as the highest priority of all sidelink HARQ processes that span the one or more sidelink HARQ processes.

7. The UE according to claim 5, wherein, The one or more processors used for retransmitting the sidelink HARQ feedback are configured to retransmit the sidelink HARQ feedback after receiving a trigger in the DCI that does not include a valid sidelink permission, the trigger being used to report only the type 3 codebook.

8. The UE according to claim 7, wherein, The trigger for reporting only type 3 codebooks is indicated by a specific combination of frequency domain resource allocation fields in the DCI.

9. The UE according to claim 1, wherein, The one or more processors used for retransmitting the sidelink HARQ feedback are configured to: concatenate or multiplex the sidelink HARQ feedback with the HARQ feedback for the Uu interface in a Type 3 codebook for the Uu interface, and transmit the Type 3 codebook for the Uu interface.

10. The UE according to claim 9, wherein, The DCI is in DCI format 1_1.

11. The UE according to claim 9, wherein, The sidelink HARQ feedback is used for multiple sidelink component carriers (CCs).

12. The UE according to claim 9, wherein, The one or more processors for transmitting the Type 3 codebook for the Uu interface with the sidelink HARQ feedback are configured to transmit the Type 3 codebook for the Uu interface with the sidelink HARQ feedback, at least in part based on parameters for Type 3 codebook control received in a radio resource control message.

13. A base station for wireless communication, comprising: Memory; as well as One or more processors coupled to the memory are configured to: Sending downlink control information (DCI) to the user equipment (UE), the DCI instructing the UE to retransmit the sidelink HARQ feedback used for sidelink communication after the sidelink hybrid automatic repeat request (HARQ) feedback for the sidelink communication has been discarded; and At least in part, based on transmitting the DCI, the sidelink HARQ feedback for one or more sidelink HARQ procedures is received on the Physical Uplink Control Channel (PUCCH).

14. The base station according to claim 13, wherein, The DCI includes bits with DCI format 3_0 for triggering retransmissions of the side link HARQ feedback.

15. The base station according to claim 13, wherein, For each sidelink HARQ procedure in the one or more sidelink HARQ procedures, the sidelink HARQ feedback includes a HARQ acknowledgment (ACK) or a negative acknowledgment (NACK) multiplexed into the sidelink HARQ ACK codebook.

16. The base station according to claim 15, wherein, The sidelink HARQ ACK codebook is a type 3 codebook.

17. The base station according to claim 16, wherein, The one or more processors are configured to send a trigger for reporting only type 3 codebooks in the frequency domain resource allocation field of the DCI.

18. The base station according to claim 16, wherein, The one or more processors for receiving the sidelink HARQ feedback are configured to: receive the sidelink HARQ feedback concatenated with or multiplexed with the HARQ feedback for the Uu interface in a type 3 codebook for the Uu interface, wherein the DCI is DCI format 1_1.

19. The base station according to claim 16, wherein, The one or more processors are configured to: send parameters for Type 3 codebook control in a radio resource control message, wherein the parameters indicate that the UE will send the sidelink HARQ feedback concatenated with or multiplexed in the Type 3 codebook for the Uu interface, and wherein the one or more processors for receiving the sidelink HARQ feedback are configured to: receive the sidelink HARQ feedback concatenated with or multiplexed in the Type 3 codebook for the Uu interface.

20. A method for wireless communication performed by a user equipment (UE), comprising: Receive downlink control information (DCI) instructing the UE to retransmit the sidelink hybrid automatic repeat request (HARQ) feedback after it has been discarded; and Based at least in part on the DCI, after the sidelink HARQ feedback for the sidelink communication is discarded, the sidelink HARQ feedback for one or more sidelink HARQ procedures is retransmitted on the Physical Uplink Control Channel (PUCCH).

21. The method according to claim 20, wherein, The DCI includes bits with DCI format 3_0 for triggering retransmissions of the side link HARQ feedback.

22. The method according to claim 20, wherein, For each of the one or more sidelink HARQ processes, the sidelink HARQ feedback includes a HARQ acknowledgment (ACK) or negative acknowledgment (NACK) multiplexed into the sidelink HARQ ACK codebook, wherein the sidelink HARQ ACK codebook is a type 3 codebook.

23. The method according to claim 22, wherein, The priority of the type 3 codebook is the same as the highest priority of all sidelink HARQ processes that span the one or more sidelink HARQ processes.

24. The method of claim 20, wherein, The retransmission of the sidelink HARQ feedback includes: retransmitting the sidelink HARQ feedback after receiving a trigger in the DCI for reporting only the type 3 codebook, without requiring a valid sidelink permission.

25. The method according to claim 20, wherein, Retransmitting the sidelink HARQ feedback includes: concatenating or multiplexing the sidelink HARQ feedback with the HARQ feedback for the Uu interface in the type 3 codebook for the Uu interface, and sending the type 3 codebook for the Uu interface.

26. A method for wireless communication performed by a base station, comprising: Sending downlink control information (DCI) to the user equipment (UE), the DCI instructing the UE to retransmit the sidelink HARQ feedback used for sidelink communication after the sidelink hybrid automatic repeat request (HARQ) feedback for the sidelink communication has been discarded; and At least in part, based on transmitting the DCI, the sidelink HARQ feedback for one or more sidelink HARQ procedures is received on the Physical Uplink Control Channel (PUCCH).

27. The method according to claim 26, wherein, The DCI includes bits of DCI format 3_0 for triggering retransmissions of the sidelink HARQ feedback, wherein, for each sidelink HARQ procedure in the one or more sidelink HARQ procedures, the sidelink HARQ feedback includes a HARQ ACK or a negative ACK multiplexed into the sidelink HARQ ACK codebook, and wherein the sidelink HARQ ACK codebook is a type 3 codebook.

28. The method of claim 26, further comprising: A trigger for reporting only type 3 codebooks is sent in the frequency domain resource allocation field of the DCI.

29. The method according to claim 26, wherein, Receiving the sidelink HARQ feedback includes: receiving the sidelink HARQ feedback concatenated or multiplexed with the HARQ feedback for the Uu interface in a type 3 codebook for the Uu interface, wherein the DCI is DCI format 1_1.

30. The method of claim 26, further comprising: In a radio resource control message, parameters for Type 3 codebook control are sent, wherein the parameters indicate that the UE will send the sidelink HARQ feedback concatenated with or multiplexed in the Type 3 codebook for the Uu interface, wherein receiving the sidelink HARQ feedback includes receiving the sidelink HARQ feedback concatenated with or multiplexed in the Type 3 codebook for the Uu interface.

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