Sidelink component carrier selection for feedback during sidelink carrier aggregation

Abstract

In general, various aspects of the present disclosure relate to wireless communications. In some aspects, a first user equipment (UE) may receive communications from a second UE. The UE may send sidelink hybrid automatic repeat request acknowledgement (HARQ-ACK) feedback to the second UE using a sidelink component carrier based at least in part on the communications received from the second UE, wherein the sidelink component carrier is associated with transmitting sidelink HARQ-ACK feedback when sidelink carrier aggregation is configured for a UE group including the first UE and the second UE. Numerous other aspects are provided.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This patent application claims priority to U.S. non-provisional patent application No. 17 / 124,081, filed on December 16, 2020, entitled “SIDELINK COMPONENTCARRIER SELECTION FOR FEEDBACK DURING SIDELINK CARRIER AGGREGATION,” which is hereby expressly incorporated herein by reference. Technical Field

[0003]

[0006] Aspects of the present disclosure generally relate to wireless communications, and aspects of the present disclosure relate to techniques and apparatus for sidelink component carrier selection for feedback during sidelink carrier aggregation. Background Art

[0004] Wireless communication systems are widely deployed to provide a variety of telecommunication services, such as telephony, video, data, messaging, and broadcasting. Typical wireless communication systems may employ multiple access technologies capable of supporting communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power, etc.). 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 (3GPP).

[0005] A wireless network may include several base stations (BSs) that can support communications for several user equipment (UEs). User equipment (UEs) can communicate with a base station (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 head, transmit receive point (TRP), new radio (NR) BS, 5G Node B, etc.

[0006] The above multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different user devices to communicate at a city, country, region, and even global level. New Radio (NR) (which may also be referred to as 5G) is a set of enhancements to the LTE mobile standard released by the Third Generation Partnership Project (3GPP). NR is designed to better support mobile broadband Internet access by improving spectrum efficiency, reducing costs, improving services, utilizing new spectrum, and using orthogonal frequency division multiplexing (OFDM) with a cyclic prefix (CP) (CP-OFDM) on the downlink (DL), and using CP-OFDM and / or SC-FDM (e.g., also known as discrete Fourier transform spread OFDM (DFT-s-OFDM)) on the uplink (UL) to better integrate with other open standards, as well as supporting beamforming, multiple-input multiple-output (MIMO) antenna technology, and carrier aggregation. 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

[0007] In some aspects, a method of wireless communication performed by a first user equipment (UE) includes: receiving communications from a second UE; and sending sidelink hybrid automatic repeat request acknowledgement (HARQ-ACK) feedback to the second UE using a sidelink component carrier based at least in part on the communications received from the second UE, wherein the sidelink component carrier is associated with transmitting sidelink HARQ-ACK feedback when sidelink carrier aggregation is configured for a UE group including the first UE and the second UE.

[0008] In some aspects, a method of wireless communication performed by a first UE includes: sending data to a second UE; and receiving sidelink HARQ-ACK feedback from the second UE via a sidelink component carrier based at least in part on the data sent to the second UE, wherein the sidelink component carrier is associated with transmitting sidelink HARQ-ACK feedback when sidelink carrier aggregation is configured for a UE group including the first UE and the second UE.

[0009] 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 configured to: receive communications from a second UE; and send sidelink HARQ-ACK feedback to the second UE using a sidelink component carrier based at least in part on the communications received from the second UE, wherein the sidelink component carrier is associated with transmitting sidelink HARQ-ACK feedback when sidelink carrier aggregation is configured for a UE group including the first UE and the second UE.

[0010] 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 configured to: send data to a second UE; and receive sidelink HARQ-ACK feedback from the second UE via a sidelink component carrier based at least in part on the data sent to the second UE, wherein the sidelink component carrier is associated with transmitting sidelink HARQ-ACK feedback when sidelink carrier aggregation is configured for a UE group including the first UE and the second UE.

[0011] In some aspects, a non-transitory computer-readable medium storing an instruction set 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: receive communications from a second UE; and send sidelink HARQ-ACK feedback to the second UE using a sidelink component carrier based at least in part on the communications received from the second UE, wherein the sidelink component carrier is associated with transmitting sidelink HARQ-ACK feedback when sidelink carrier aggregation is configured for a UE group including the first UE and the second UE.

[0012] In some aspects, a non-transitory computer-readable medium storing an instruction set 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: send data to a second UE; and receive sidelink HARQ-ACK feedback from the second UE via a sidelink component carrier based at least in part on the data sent to the second UE, wherein the sidelink component carrier is associated with transmitting sidelink HARQ-ACK feedback when sidelink carrier aggregation is configured for a UE group including the first UE and the second UE.

[0013] In some aspects, a first device for wireless communication includes: a unit for receiving communications from a second device; and a unit for sending sidelink HARQ-ACK feedback to the second device using a sidelink component carrier based at least in part on the communications received from the second device, wherein the sidelink component carrier is associated with transmitting sidelink HARQ-ACK feedback when sidelink carrier aggregation is configured for a device group including the first device and the second device.

[0014] In some aspects, a first device for wireless communication includes: a unit for sending data to a second device; and a unit for receiving sidelink HARQ-ACK feedback from the second device via a sidelink component carrier based at least in part on the data sent to the second device, wherein the sidelink component carrier is associated with transmitting sidelink HARQ-ACK feedback when sidelink carrier aggregation is configured for a device group including the first device and the second device.

[0015] In summary, aspects include methods, apparatus, systems, computer program products, non-transitory computer-readable media, user equipment, base stations, wireless communication devices, and / or processing systems as fully described herein with reference to and as illustrated by the accompanying figures and description.

[0016] The foregoing has outlined rather broadly the features and technical advantages of the examples according to the present disclosure so that the following detailed description may be better understood. Additional features and advantages will be described below. The disclosed concepts and specific examples may be readily used as a basis for modifying or designing other structures for achieving the same purpose of the present disclosure. Such equivalent constructions do not depart from the scope of the appended claims. The characteristics of the concepts disclosed herein (both their organization and method of operation) and the associated advantages will be better understood from the description below when considered in conjunction with the accompanying drawings. Each of the figures in the accompanying drawings is provided for the purpose of illustration and description and not as a definition of a limitation to the claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to fully understand the above-mentioned features of the present disclosure, a more detailed description of the invention briefly summarized above can be obtained by referring to various aspects (some of which are shown in the accompanying drawings). However, it should be noted that the accompanying drawings only illustrate certain typical aspects of the present disclosure and are therefore not to be considered as limiting the scope of the present disclosure, as the description may allow for other equally effective aspects. The same reference numerals in different drawings may identify the same or similar elements.

[0018] Figure 1 is a diagram illustrating an example of a wireless network in accordance with various aspects of the present disclosure.

[0019] Figure 2 is a diagram illustrating an example of a base station communicating with a UE in a wireless network according to various aspects of the present disclosure.

[0020] Figure 3 is a diagram illustrating an example of sidelink communications according to various aspects of the present disclosure.

[0021] Figure 4is a diagram illustrating examples of sidelink and access link communications according to various aspects of the present disclosure.

[0022] Figure 5 is a diagram illustrating an example of a sidelink channel according to various aspects of the present disclosure.

[0023] Figure 6 is a diagram illustrating an example of determining physical sidelink feedback channel (PSFCH) resources in accordance with various aspects of the present disclosure.

[0024] Figure 7-11 is a diagram illustrating an example associated with sidelink component carrier selection for feedback during sidelink carrier aggregation in accordance with various aspects of the present disclosure.

[0025] Figure 12-13 is a diagram illustrating example procedures associated with sidelink component carrier selection for feedback during sidelink carrier aggregation in accordance with various aspects of the present disclosure.

[0026] Figure 14 is a block diagram of an example apparatus for wireless communication in accordance with various aspects of the present disclosure. DETAILED DESCRIPTION

[0027] The following describes various aspects of the present disclosure in more detail with reference to the accompanying drawings. However, the present disclosure can be embodied in many different forms and should not be construed as being limited to any specific structure or function presented throughout the present disclosure. More specifically, these aspects are provided so that the present disclosure will be thorough and complete and will fully convey the scope of the present disclosure to those skilled in the art. Based on the teachings herein, it should be understood by those skilled in the art that the scope of the present disclosure is intended to cover any aspect of the present disclosure disclosed herein, whether that aspect is implemented independently of any other aspect of the present disclosure or is implemented in combination with any other aspect of the present disclosure. For example, a device can be implemented or a method can be implemented using any number of aspects set forth herein. In addition, the scope of the present disclosure is intended to cover such devices or methods implemented using other structures, functionality, or structure and functionality in addition to or different from the various aspects of the present disclosure set forth herein. It should be understood that any aspect of the present disclosure disclosed herein can be embodied by one or more elements of the claims.

[0028] Several aspects of telecommunications systems will now be presented with reference to various devices and techniques. These devices and techniques will be described in the following detailed description by various blocks, modules, components, circuits, steps, processes, algorithms, etc. (collectively referred to as "elements") and illustrated in the accompanying drawings. These elements may be implemented using hardware, software, or a combination thereof. Whether such elements are implemented as hardware or software depends on the specific application and the design constraints imposed on the overall system.

[0029] It should be noted that while various aspects may be described herein using terminology generally associated with 5G or NR radio access technologies (RATs), various aspects of the present disclosure may be applied to other RATs, such as 3G RATs, 4G RATs, and / or RATs beyond 5G (e.g., 6G).

[0030] Figure 1 is a diagram illustrating an example of a wireless network 100 according to various aspects of the present disclosure. The wireless network 100 may be or may include elements of a 5G (NR) network, an LTE network, or the like. The wireless network 100 may include several base stations 110 (illustrated 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, a Node B, a gNB, a 5G Node B (NB), an access point, a transmit receive point (TRP), or the like. Each BS may provide communication coverage for a specific geographic area. In 3GPP, the term "cell" may refer to a coverage area of ​​a BS and / or a BS subsystem serving that coverage area, depending on the context in which the term is used.

[0031] A BS may provide communication coverage for a macro cell, a pico cell, a femto cell, and / or another type of cell. A macro cell may cover a relatively large geographic area (e.g., several kilometers in radius) and may allow unrestricted access by UEs with service subscription. A pico cell may cover a relatively small geographic area and may allow unrestricted access by UEs with service subscription. A femto cell may cover a relatively small geographic area (e.g., a residence) and may allow restricted access by UEs associated with the femto cell (e.g., UEs in a closed subscriber group (CSG)). A BS for a macro cell may be referred to as a macro BS. A BS for a pico cell may be referred to as a pico BS. A BS for a femto cell may be referred to as a femto BS or a home BS. In Figure 1In the example shown in FIG, BS 110a may be a macro BS for macrocell 102a, BS 110b may be a pico BS for picocell 102b, and BS 110c may be a femto BS for femtocell 102c. A BS may support one or more (e.g., three) cells. The terms "eNB," "base station," "NR BS," "gNB," "TRP," "AP," "Node B," "5G NB," and "cell" may be used interchangeably herein.

[0032] In some aspects, the cells may not necessarily be stationary, and the geographic area of ​​the cells may move depending on the location of the mobile BS. In some aspects, the BSs may be interconnected to each other and / or 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, virtual networks, etc.).

[0033] The wireless network 100 may also include a relay station. A relay station is an entity that can receive transmissions of data from an upstream station (e.g., a BS or a UE) and send transmissions of data to a downstream station (e.g., a UE or a BS). A relay station may also be a UE that can relay transmissions for other UEs. Figure 1 In the example shown in , relay BS 110d may communicate with macro BS 110a and UE 120d to facilitate communication between BS 110a and UE 120d. A relay BS may also be referred to as a relay station, relay base station, relay, etc.

[0034] The wireless network 100 may be a heterogeneous network including different types of BSs (e.g., macro BSs, pico BSs, femto BSs, relay BSs, etc.). These different types of BSs may have different transmit power levels, different coverage areas, and different impacts on interference in the wireless network 100. For example, a macro BS may have a high transmit power level (e.g., 5 to 40 watts), while a pico BS, a femto BS, and a relay BS may have a lower transmit power level (e.g., 0.1 to 2 watts).

[0035] The network controller 130 may be coupled to a group of BSs and may provide coordination and control for these BSs. The network controller 130 may communicate with the BSs via a backhaul. The BSs may also communicate with each other via a wireless or wired backhaul (e.g., directly or indirectly).

[0036] UEs 120 (e.g., 120a, 120b, 120c) may be dispersed throughout the wireless network 100, and each UE may be stationary or mobile. A UE may also be referred to as an access terminal, terminal, mobile station, subscriber unit, station, etc. A UE may be a cellular phone (e.g., a smartphone), a personal digital assistant (PDA), a wireless modem, a wireless communication device, a handheld device, a laptop computer, a cordless phone, a wireless local loop (WLL) station, a tablet device, a camera, a gaming device, a netbook, a smartbook, an ultrabook, a medical device or apparatus, a biometric sensor / device, a wearable device (e.g., a smart watch, smart clothing, smart glasses, a smart wristband, smart jewelry (e.g., a smart ring, a smart bracelet)), an entertainment device (e.g., a music or video device, or a satellite radio unit), a vehicle component or sensor, a smart meter / sensor, industrial manufacturing equipment, a global positioning system device, or any other suitable device configured to communicate via a wireless or wired medium.

[0037] Some UEs may 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, location tags, etc., which can communicate with a base station, another device (e.g., a remote device), or some other entity. A wireless node may provide a connection to or to a network (e.g., a wide area network such as the Internet or a cellular network) via, for example, a wired or wireless communication link. Some UEs may be considered Internet of Things (IoT) devices and / or may be implemented as NB-IoT (narrowband Internet of Things) devices. Some UEs may be considered customer premises equipment (CPE). UE 120 may be included inside a housing that houses components of UE 120 (such as a processor component, a memory component, etc.). In some aspects, the processor component and the memory component may be coupled together. For example, a processor component (e.g., one or more processors) and a memory component (e.g., a memory) may be operatively coupled, communicatively coupled, electronically coupled, electrically coupled, etc.

[0038] In general, any number of wireless networks can be deployed in a given geographic area. Each wireless network can support a specific RAT and can operate on one or more frequencies. RATs can also be referred to as radio technologies, air interfaces, etc. Frequencies can also be referred to as carriers, frequency channels, etc. Each frequency can support a single RAT in a given geographic area to avoid interference between wireless networks of different RATs. In some cases, NR or 5G RAT networks can be deployed.

[0039] In some aspects, two or more UEs 120 (e.g., shown as UE 120a and UE 120e) can communicate directly using one or more sidelink channels (e.g., without using base station 110 as an intermediary to communicate with each other). For example, the UEs 120 can 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.), mesh networks, etc. In this case, the UEs 120 can perform scheduling operations, resource selection operations, and / or other operations described elsewhere herein as being performed by the base station 110.

[0040] Devices of the wireless network 100 may communicate using an 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 having a first frequency range (FR1) that may span from 410 MHz to 7.125 GHz, and / or may communicate using an operating band having a second frequency range (FR2) that may span from 24.25 GHz to 52.6 GHz. Frequencies between FR1 and FR2 are sometimes referred to as mid-band frequencies. Although a portion of FR1 is greater than 6 GHz, FR1 is often referred to as a "sub-6 GHz" band. Similarly, FR2 is often referred to as a "millimeter wave" band, although it is different from the extremely high frequency (EHF) band (30 GHz–300 GHz) identified as a "millimeter wave" band by the International Telecommunication Union (ITU). Therefore, unless otherwise expressly stated, it should be understood that the term "sub-6 GHz" and the like (if used herein) can broadly refer to frequencies less than 6 GHz, frequencies within FR1, and / or mid-band frequencies (e.g., greater than 7.125 GHz). Similarly, unless otherwise expressly stated, it should be understood that the term "millimeter wave" and the like (if used herein) can broadly refer to frequencies within the EHF band, frequencies within FR2, and / or mid-band frequencies (e.g., less than 24.25 GHz). It is contemplated that the frequencies included in FR1 and FR2 may be modified, and the techniques described herein are applicable to those modified frequency ranges.

[0041] As pointed out above, Figure 1 is provided as an example. Other examples may differ from those described in relation to Figure 1 Examples described.

[0042] Figure 2is a diagram illustrating an example 200 of a base station 110 in communication with a UE 120 in a wireless network 100 in accordance with various aspects of the present disclosure. The base station 110 may be equipped with T antennas 234a through 234t, and the UE 120 may be equipped with R antennas 252a through 252r, where in general, T ≥ 1 and R ≥ 1.

[0043] At the base station 110, a transmit processor 220 may receive data for one or more UEs from a data source 212, select one or more modulation and coding schemes (MCS) for each UE based at least in part on a channel quality indicator (CQI) received from the UE, process (e.g., encode and modulate) the data for each UE based at least in part on the MCS selected for the UE, and provide data symbols for all UEs. The transmit processor 220 may also process system information (e.g., for semi-static resource partitioning information (SRPI) and control information (e.g., CQI requests, grants, and / or upper layer signaling), and provide overhead symbols and control symbols. The transmit processor 220 may also generate reference symbols for reference signals (e.g., cell-specific reference signals (CRS), demodulation reference signals (DMRS), etc.) and synchronization signals (e.g., primary synchronization signals (PSS) and secondary synchronization signals (SSS)). A transmit (TX) multiple-input, multiple-output (MIMO) processor 230 may perform spatial processing (e.g., precoding) on ​​data symbols, control symbols, overhead symbols, and / or reference symbols, if applicable, and may provide T output symbol streams to T modulators (MODs) 232a through 232t. Each modulator 232 may process a corresponding output symbol stream (e.g., for OFDM, etc.) to obtain an output sample stream. Each modulator 232 may further process (e.g., convert to analog, amplify, filter, and upconvert) the output sample stream to obtain a downlink signal. T downlink signals from modulators 232a through 232t may be transmitted via T antennas 234a through 234t, respectively.

[0044] At UE 120, antennas 252a through 252r may receive downlink signals from base station 110 and / or other base stations and may provide received signals to demodulators (DEMODs) 254a through 254r, respectively. Each demodulator 254 may condition (e.g., filter, amplify, downconvert, and digitize) the received signal to obtain input samples. Each demodulator 254 may further process the input samples (e.g., for OFDM, etc.) to obtain received symbols. A MIMO detector 256 may obtain received symbols from all R demodulators 254a through 254r, perform MIMO detection on the received symbols (if applicable), and provide detected symbols. A receive processor 258 may process (e.g., demodulate and decode) the detected symbols, provide decoded data for UE 120 to a data sink 260, and provide decoded control information and system information to a controller / processor 280. The term "controller / processor" may refer to one or more controllers, one or more processors, or a combination thereof. The channel processor may determine reference signal received power (RSRP), received signal strength indicator (RSSI), reference signal received quality (RSRQ), channel quality indicator (CQI), etc. In some aspects, one or more components of the UE 120 may be included in the housing 284 .

[0045] The network controller 130 may include a communication unit 294, a controller / processor 290, and a memory 292. The network controller 130 may include, for example, one or more devices in a core network. The network controller 130 may communicate with the base station 110 via the communication unit 294.

[0046] On the uplink, at the UE 120, a transmit processor 264 may receive and process data from a data source 262 and control information from a controller / processor 280 (e.g., for reports including RSRP, RSSI, RSRQ, CQI, etc.). The transmit processor 264 may also generate reference symbols for one or more reference signals. The symbols from the transmit processor 264 may be precoded by a TX MIMO processor 266 (if applicable), further processed by modulators 254a through 254r (e.g., for DFT-s-OFDM, CP-OFDM, etc.), and transmitted to the base station 110. In some aspects, the UE 120 includes a transceiver. The transceiver may include any combination of antennas 252, modulators and / or demodulators 254, a MIMO detector 256, a receive processor 258, a transmit processor 264, and / or a 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 (e.g., as described with reference to Figure 7-13 description).

[0047] At base station 110, uplink signals from UE 120 and other UEs may be received by antenna 234, processed by demodulator 232, detected by MIMO detector 236 (if applicable), and further processed by receive processor 238 to obtain decoded data and control information sent by UE 120. Receive processor 238 may provide decoded data to a data sink 239 and decoded control information to controller / processor 240. Base station 110 may include a communication unit 244 and communicate with network controller 130 via communication unit 244. Base station 110 may include a scheduler 246 to schedule UE 120 for downlink and / or uplink communications. 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, receive processor 238, transmit 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 (e.g., as described with reference to Figure 7-13 description).

[0048] The controller / processor 240 of the base station 110, the controller / processor 280 of the UE 120, and / or Figure 2 Any other components in the may perform one or more techniques associated with sidelink component carrier selection for feedback during sidelink carrier aggregation, as described in more detail elsewhere herein. For example, the controller / processor 240 of the base station 110, the controller / processor 280 of the UE 120, and / or Figure 2 Any other component in may perform or direct e.g. Figure 12 The process of 1200 Figure 13 1300 and / or other processes as described herein. Memories 242 and 282 may store data and program codes 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, program code, etc.) for wireless communications. For example, the one or more instructions, when executed (e.g., directly or after compilation, conversion, interpretation, etc.) by one or more processors of base station 110 and / or UE 120, may cause the one or more processors, UE 120, and / or base station 110 to perform or direct, for example, Figure 12 The process of 1200 Figure 13The operations of process 1300 and / or other processes as described herein. In some aspects, executing instructions may include running instructions, converting instructions, compiling instructions, interpreting instructions, etc.

[0049] In some aspects, a UE (e.g., UE 120) may include: means for receiving a communication from a second UE; means for sending sidelink HARQ-ACK feedback to the second UE using a sidelink component carrier based at least in part on the communication received from the second UE, wherein the sidelink component carrier is associated with transmitting sidelink HARQ-ACK feedback when sidelink carrier aggregation is configured for a UE group including the first UE and the second UE; etc. In some aspects, such means may include in conjunction with Figure 2 One or more components of UE 120 are depicted, such as controller / processor 280, transmit processor 264, TX MIMO processor 266, MOD 254, antenna 252, DEMOD 254, MIMO detector 256, receive processor 258, and the like.

[0050] In some aspects, a UE (e.g., UE 120) can include: means for sending data to a second UE; means for receiving sidelink HARQ-ACK feedback from the second UE via a sidelink component carrier based at least in part on the data sent to the second UE, wherein the sidelink component carrier is associated with transmitting sidelink HARQ-ACK feedback when sidelink carrier aggregation is configured for a UE group including the first UE and the second UE, etc. In some aspects, such means can include in conjunction with Figure 2 One or more components of UE 120 are depicted, such as controller / processor 280, transmit processor 264, TX MIMO processor 266, MOD 254, antenna 252, DEMOD 254, MIMO detector 256, receive processor 258, and the like.

[0051] Although Figure 2 The blocks in FIG. 2 are shown as distinct components, but the functionality described above with respect to these blocks may be implemented in a single hardware, software, or combined component, or in various combinations of components. For example, the functionality described with respect to the transmit processor 264, the receive processor 258, and / or the TX MIMO processor 266 may be performed by or under the control of the controller / processor 280.

[0052] As pointed out above, Figure 2 is provided as an example. Other examples may differ from those described in relation to Figure 2 Examples described.

[0053] Figure 3is a diagram illustrating an example 300 of sidelink communications in accordance with various aspects of the present disclosure.

[0054] like Figure 3 As shown, a first UE 305-1 can communicate with a 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, vehicle-to-person (V2P) communication, etc.), mesh networking, etc. In some aspects, UEs 305 (e.g., UE 305-1 and / or UE 305-2) can correspond to one or more other UEs described elsewhere herein, such as UE 120. 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., a 5.9 GHz band). Additionally or alternatively, UEs 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.).

[0055] like Figure 3 As further shown, the 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. Similar to the physical downlink control channel (PDCCH) and / or physical uplink control channel (PUCCH) used for cellular communication with base station 110 via an 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 an access link or access channel, PSSCH 320 may be used to transmit data. 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 transport blocks (TBs) 335 may be carried on PSSCH 320. The TB 335 may include data. The PSFCH 325 may be used to transmit sidelink feedback 340, such as HARQ feedback (eg, acknowledgement or negative acknowledgement (ACK / NACK) information), transmit power control (TPC), scheduling request (SR), and the like.

[0056] In some aspects, one or more sidelink channels 310 may utilize a resource pool. For example, a scheduling assignment (e.g., included in SCI 330) may be sent in a subchannel using specific resource blocks (RBs) across time. In some aspects, a data transmission associated with the 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, the scheduling assignment and the associated data transmission are not sent on adjacent RBs.

[0057] In some aspects, the UE 305 can operate using a transmission mode in which resource selection and / or scheduling is performed by the UE 305 (e.g., rather than the base station 110). In some aspects, the UE 305 can perform resource selection and / or scheduling by sensing channel availability for transmission. For example, the UE 305 can measure received signal strength indicator (RSSI) parameters associated with various sidelink channels (e.g., sidelink RSSI (S-RSSI) parameters), can measure reference signal received power (RSRP) parameters associated with various sidelink channels (e.g., PSSCH-RSRP parameters), can measure reference signal received quality (RSRQ) parameters associated with various sidelink channels (e.g., PSSCH-RSRQ parameters), etc., and can select a channel for transmission of sidelink communications based at least in part on the measurements.

[0058] Additionally or alternatively, the UE 305 may perform resource selection and / or scheduling using the SCI 330 received in the PSCCH 315, which may indicate occupied resources, channel parameters, etc. Additionally or alternatively, the UE 305 may perform resource selection and / or scheduling by determining a channel busy rate (CBR) associated with various sidelink channels, which may be used for rate control (e.g., by indicating a maximum number of resource blocks that the UE 305 may use for a particular set of subframes).

[0059] In a transmission mode in which resource selection and / or scheduling is performed by the UE 305, the UE 305 may generate a sidelink grant and may send the grant in the SCI 330. The sidelink grant may indicate, for example, one or more parameters (e.g., transmission parameters) for an upcoming sidelink transmission, such as one or more resource blocks to be used for the upcoming sidelink transmission on the PSSCH 320 (e.g., for TB 335), one or more subframes to be used for the upcoming sidelink transmission, a modulation and coding scheme (MCS) to be used for the upcoming sidelink transmission, etc. In some aspects, the UE 305 may generate a sidelink grant that indicates one or more parameters for semi-persistent scheduling (SPS), such as a periodicity of the sidelink transmission. Additionally or alternatively, the UE 305 may generate a sidelink grant for event-driven scheduling (e.g., for on-demand sidelink messages).

[0060] As pointed out above, Figure 3 is provided as an example. Other examples may differ from those described in relation to Figure 3 Examples described.

[0061] Figure 4 is a diagram illustrating an example 400 of sidelink and access link communications in accordance with various aspects of the present disclosure.

[0062] 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 in conjunction with Figure 3 As further shown, in some sidelink modes, the base station 110 can communicate with the Tx / Rx UE 405 via a first access link. Additionally or alternatively, in some sidelink modes, the base station 110 can communicate with the Rx / Tx UE 410 via a second access link. The Tx / Rx UE 405 and / or the Rx / Tx UE 410 can 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 called a sidelink, and the direct link between base station 110 and UE 120 (e.g., via the Uu interface) can be called an access link. Sidelink communications can be sent via the sidelink, and access link communications can be sent via the access link. Access link communications can be downlink communications (from base station 110 to UE 120) or uplink communications (from UE 120 to base station 110).

[0063] As pointed out above, Figure 4is provided as an example. Other examples may differ from those described in relation to Figure 4 Examples described.

[0064] In LTE systems, sidelink carrier aggregation is used for LTE Mode 4 resource allocation. LTE Mode 4 resource allocation may correspond to NR Mode 2 resource allocation, where autonomous transmission may be performed via a sidelink channel via a sensing and reservation mechanism. From a physical layer perspective, up to eight sidelink component carriers may be aggregated. Furthermore, a specific sidelink component carrier may be indicated by higher layers for transmission and potential retransmission of data, such as a medium access control (MAC) protocol data unit (PDU).

[0065] Configuration for aggregated sidelink component carriers may be provided via higher layers. A subset of the aggregated sidelink component carriers may be active in a UE at a given time, depending on the active applications executing on the UE. The mapping between a given sidelink component carrier and a given application may occur at higher layers. For example, a UE interested in a given application may identify the set of sidelink component carriers that are activated for transmission and / or reception without handshaking or negotiation involving the UE. One application may be mapped to a single sidelink component carrier. In some cases, carrier aggregation capable and non-carrier aggregation capable UEs may communicate with each other. Non-carrier aggregation UEs may support basic safety messages that may be mapped to a sidelink component carrier shared by a non-carrier aggregation UE and a carrier aggregation capable UE.

[0066] In NR systems, sidelink carrier aggregation can be associated with two independent operating modes. In the first operating mode, sidelink carrier aggregation can be established and controlled by the network. In the second operating mode, sidelink carrier aggregation can be established by peer UEs (such as other sidelink UEs).

[0067] In NR systems, sidelink carrier aggregation can be associated with one of several broadcast types, such as unicast, multicast, or broadcast. Regarding unicast, one unicast session or multiple unicast sessions can be supported. For example, a relay UE can support multiple remote UEs in multiple unicast sessions.

[0068] There are several differences between sidelink carrier aggregation in LTE systems and sidelink carrier aggregation in NR systems. LTE systems may support broadcast, but not unicast and multicast, while NR systems may support unicast, multicast, and broadcast. LTE systems may not support sidelink HARQ feedback, while NR systems may support sidelink HARQ feedback. NR systems may support sidelink HARQ feedback for unicast and multicast. In LTE systems, sidelink carrier aggregation may not be controlled by the base station, while in NR systems, sidelink carrier aggregation may not be controlled by the base station.

[0069] A bandwidth portion can be configured with multiple transmit and receive sidelink resource pools. Each transmit sidelink resource pool can also be used for reception. However, a given receive sidelink resource pool may not be used for transmission. PSFCH configuration can be specific to each sidelink resource pool.

[0070] In a given bandwidth portion, multiple sidelink resource pools (e.g., all sidelink resource pools) may have the same PSFCH configuration. Thus, when a UE is active on multiple sidelink resource pools, phase discontinuity due to misaligned transmissions may not occur.

[0071] For sidelink carrier aggregation, the sidelink component carriers may be pre-configured, and each bandwidth part may be pre-configured with several sidelink resource pools. Alternatively, for sidelink carrier aggregation, the sidelink component carriers may be configured, and the sidelink resource pools associated with each bandwidth part may be configured by a third node (such as a base station or relay node).

[0072] Figure 5 is a diagram illustrating an example 500 of a sidelink channel in accordance with various aspects of the present disclosure.

[0073] like Figure 5 As shown, PSCCH and PSSCH can be associated with multiple resources in the time domain and frequency domain. PSFCH can be associated with multiple resources in the time domain and frequency domain. PSCCH and PSSCH may not be separated by a gap. PSCCH and PSSCH may be separated from PSFCH by a gap.

[0074] As pointed out above, Figure 5 is provided as an example. Other examples may differ from those described in relation to Figure 5 Examples described.

[0075] Figure 6 is a diagram illustrating an example 600 of determining PSFCH resources in accordance with various aspects of the present disclosure.

[0076] The periodPSFCHresource parameter may indicate the PSFCH period in the sidelink resource pool in number of time slots. The periodPSFCHresource parameter may be set to {0,1,2,4}. When the periodPSFCHresource parameter is set to 0, PSFCH transmissions from the UE in the sidelink resource pool may be disabled. The UE may send a PSFCH in a first time slot that includes PSFCH resources and is at least a number of time slots after the last time slot of PSSCH reception in the sidelink resource pool (as provided by the minimum time gap for PSFCH (MinTimeGapPSFCH) parameter). The resource block set PSFCH (rbSetPSFCH) parameter may indicate the number of resource blocks in the sidelink resource pool used for PSFCH transmission. The parameter numSubchannel can indicate the number of subchannels N used for the sidelink resource pool. subch The number of PSSCH slots associated with a PSFCH slot can be determined by Indicates and can be determined based at least in part on the periodPSFCHresource parameter. where α represents an integer value. In addition, in Indicates the number of PSFCH PRBs used for the subchannel.

[0077] UE can Physical resource blocks Physical resource blocks are allocated to time slot i and subchannel j, where And 0≤j≤N subch .

[0078] exist Figure 4 In the example shown, Can be equal to four, which can correspond to the PSFCH period. In addition, N subch may be equal to ten, which may correspond to the number of subchannels used in the sidelink resource pool. Can correspond to It is equal to two. In other words, each subchannel may be associated with two PSFCH PRBs (which may correspond to 80 PRBs for PSFCH). In this example, each subchannel may be associated with two PSFCH PRBs, but the PSFCH may be transmitted on one of the PSFCH PRBs.

[0079] As pointed out above, Figure 6 is provided as an example. Other examples may differ from those described in relation to Figure 6 Examples described.

[0080] For sidelink carrier aggregation, sidelink HARQ ACK feedback may be performed on a per sidelink resource pool and per sidelink component carrier basis. In some cases, it may be beneficial to use a single sidelink component carrier or a subset of sidelink component carriers to perform sidelink HARQ ACK feedback for several reasons. For example, different UEs establishing a sidelink connection may have different capabilities in terms of the number of supported transmit and receive sidelink component carriers. Furthermore, simultaneous transmission of PSFCHs on different sidelink component carriers may introduce maximum power reduction (MPR) values ​​or additional MPR (A-MPR) values, thereby reducing reliability. Furthermore, the UE may expend an increased amount of power when transmitting multiple PSFCHs compared to transmitting a single PSFCH carrying the same number of bits. Therefore, a single sidelink component carrier or a subset of component carriers may be selected to transmit sidelink HARQ ACK feedback.

[0081] For the first UE, the sidelink HARQ component carrier (e.g., sidelink primary cell) can be the same or different. The first UE can send a sidelink HARQ to the second UE on the first component carrier (e.g., CC0), and the second UE can send a sidelink HARQ to the first UE on the second component carrier (e.g., CC1).

[0082] As explained above, in NR systems, sidelink HARQ-ACK feedback may be supported, which was not previously supported in LTE systems. However, the sidelink UE may not be configured to send sidelink HARQ-ACK feedback for sidelink carrier aggregation. In other words, the sidelink UE may not be configured to use a specific sidelink component carrier and / or sidelink resource pool to send sidelink HARQ-ACK feedback.

[0083] In various aspects of the techniques and apparatus described herein, when sidelink carrier aggregation is configured across a pair or group of UEs, a single sidelink resource pool or sidelink component carrier may be assigned to carry sidelink HARQ-ACK feedback for a group of sidelink resource pools or sidelink component carriers. In some aspects, within a group of sidelink component carriers with a PSFCH configuration, a single sidelink component carrier or a subset of sidelink component carriers may be indicated to the sidelink UE to carry the sidelink HARQ-ACK feedback. For example, the sidelink UE may receive the indication from a base station or a relay node. In some aspects, when sidelink carrier aggregation is allowed across sidelink component carriers with the same PSFCH configuration, a sidelink component carrier or a subset of sidelink component carriers may be selected to transmit the sidelink HARQ-ACK feedback. When a subset of sidelink component carriers is selected, mapping may be performed between each sidelink component carrier and each of the sidelink HARQ component carriers. For example, HARQ for PSSCH on a first component carrier (eg, CC1) may be mapped to a first sidelink HARQ component carrier, and HARQ for PSSCH on a second component carrier (eg, CC2) may be mapped to a second sidelink HARQ component carrier.

[0084] Figure 7 is a diagram illustrating an example 700 associated with sidelink component carrier selection for feedback during sidelink carrier aggregation in accordance with various aspects of the present disclosure. Figure 7 As shown, example 700 includes communications between a first UE (e.g., UE 120a) and a second UE (e.g., UE 120e). In some aspects, the first UE and the second UE may be included in a wireless network, such as wireless network 100. The first UE and the second UE may communicate on a wireless sidelink.

[0085] As indicated by reference numeral 702, when sidelink carrier aggregation is configured for a UE group that may include a first UE and a second UE, the first UE may determine a sidelink component carrier associated with transmitting sidelink HARQ-ACK feedback. The first UE and the second UE may be sidelink UEs. The sidelink component carrier may be associated with a sidelink resource pool for transmitting sidelink HARQ-ACK feedback. For example, in the case of unicast, the sidelink component carrier associated with transmitting sidelink HARQ-ACK feedback may be determined by both the first UE and the second UE in the negotiation during PC5 link establishment. The sidelink component carrier associated with transmitting sidelink HARQ-ACK feedback may be determined at least in part based on the transmit / receive capabilities of the first UE and the second UE and / or the frequency bands supported by the first UE and the second UE.

[0086] In some aspects, when sidelink carrier aggregation is configured across a UE pair (e.g., a first UE and a second UE) or a UE group, a single sidelink resource pool or a single sidelink component carrier may be assigned to carry sidelink HARQ-ACK feedback for the sidelink resource pool or the sidelink component carrier group.

[0087] In some aspects, a sidelink component carrier group may be pre-configured for a UE pair or group of UEs. For example, a UE pair or group may select a sidelink component carrier group to communicate with each other. A sidelink component carrier group may be associated with the same PSFCH configuration, different PSFCH configurations, or no PSFCH configuration. A sidelink component carrier group may include a single sidelink component carrier designated to carry sidelink HARQ-ACK feedback.

[0088] In some aspects, a single sidelink component carrier (or a subset of sidelink component carriers) for carrying sidelink HARQ-ACK feedback may be indicated to the first UE, where the single sidelink component carrier (or subset) may be associated with a PSFCH configuration. The first UE may receive the indication via explicit signaling from the base station. For example, when the first UE and / or the second UE is within the coverage of the base station, the indication may be received directly from the base station. Alternatively, the indication may be received indirectly from the base station, for example, via another node such as a relay node. When the first UE and / or the second UE is out of coverage relative to the base station, the indication may be received indirectly from the base station.

[0089] In some aspects, the first UE may determine a sidelink component carrier associated with transmitting sidelink HARQ-ACK feedback based at least in part on receiving an indication of the sidelink component carrier. The sidelink component carrier may be associated with a PSFCH configuration. In some aspects, the first UE may receive the indication from the base station when the first UE is within coverage relative to the base station. In some aspects, the first UE may receive the indication from the base station via a relay node when the first UE is out of coverage relative to the base station.

[0090] In some aspects, a first UE may receive an indication of a sidelink component carrier from a second UE via a sidelink connection between the first UE and the second UE. In other words, a sidelink component carrier for transmitting sidelink HARQ-ACK feedback may be selected between the first UE and the second UE connected via the sidelink connection. The sidelink component carrier may be determined by the first UE or the second UE, or the sidelink component carrier may be negotiated between the first UE and the second UE.

[0091] In some aspects, when multiple sidelink resource pools or sidelink component carriers can be used to carry sidelink HARQ-ACK feedback, a mapping between the multiple sidelink resource pools or sidelink component carriers and a specific sidelink resource pool or sidelink component carrier assigned to carry sidelink HARQ-ACK feedback can be indicated to the UE via an indication sent to the first UE. In other words, the specific sidelink resource pool or sidelink component carrier associated with the indication can be selected from a group of sidelink component carriers configured to potentially carry sidelink HARQ-ACK feedback. In some aspects, when the first UE is within coverage relative to the base station, the first UE can receive the indication from the base station. In some aspects, when the first UE is out of coverage relative to the base station, the first UE can receive the indication from the base station via a relay node.

[0092] In some aspects, for each sidelink connection (e.g., a sidelink connection between a first UE and a second UE), sidelink HARQ-ACK feedback associated with one sidelink component carrier may be associated with a single sidelink HARQ-ACK feedback sidelink component carrier. In other words, the sidelink component carrier used to transmit sidelink HARQ-ACK feedback to the second UE may be specific to the sidelink connection between the first UE and the second UE.

[0093] As an example, the first UE may have a unicast link with the second UE, and the first UE may have a separate unicast link with the third UE. For the sidelink connection between the first UE and the second UE, a single sidelink component carrier may be selected to carry the sidelink HARQ-ACK feedback. In this case, multiple sidelink component carriers (e.g., all sidelink component carriers) between the first UE and the second UE may have associated sidelink HARQ-ACK feedback sent on a single sidelink carrier. The first UE may have a separate sidelink connection with the third UE on the same multiple sidelink component carriers. For the separate sidelink connection between the first UE and the third UE, a separate sidelink component carrier may be selected to carry the sidelink HARQ-ACK feedback between the first UE and the third UE.

[0094] In some aspects, a sidelink component carrier associated with transmitting sidelink HARQ-ACK feedback may not be received from the base station. In this case, the first UE may determine the sidelink component carrier based on whether a single sidelink component carrier is associated with the PSFCH configuration or whether a group or multiple sidelink component carriers are associated with the PSFCH configuration.

[0095] In some aspects, when a single sidelink component carrier is associated with the PSFCH configuration, the first UE may select the single sidelink component carrier to carry sidelink HARQ-ACK feedback.

[0096] In some aspects, when a sidelink component carrier group is associated with a PSFCH configuration, the first UE may select one of the sidelink component carriers to carry sidelink HARQ-ACK feedback. In some aspects, the sidelink component carrier selected by the first UE may correspond to an initial sidelink component carrier used for discovery and link establishment (e.g., PC5 link establishment) between the first UE and the second UE. In some aspects, the sidelink component carrier selected by the first UE may correspond to a sidelink component carrier associated with a minimum index relative to the sidelink component carrier group. In some aspects, the first UE may select the sidelink component carrier based at least in part on an associated PSFCH configuration, which may indicate a number of resource blocks, supported sidelink feedback channel formats, and a periodicity.

[0097] In some aspects, when a sidelink component carrier group is associated with a PSFCH configuration, the sidelink component carrier can be selected by the first UE or the second UE. For example, a UE pair (e.g., a first UE and a second UE) or a UE group can identify a single sidelink component carrier (or a subset of sidelink component carriers) with a PSFCH configuration for transmitting sidelink HARQ-ACK feedback. The single sidelink component carrier (or subset) can be determined by the first UE or the second UE, or the sidelink component carrier can be negotiated between the first UE and the second UE.

[0098] In some aspects, when a sidelink component carrier group is associated with a PSFCH configuration, the first UE may select a sidelink component carrier using other factors such as a source identifier (ID), a destination ID, a regional ID, a broadcast type including unicast, multicast, or broadcast, a channel busyness rate, a transmission priority, and / or a processing timeline of the first UE or the second UE. When multiple processes are used for the sidelink, the processing timeline may be considered. In some aspects, the first UE may select a sidelink component carrier based at least in part on one or more frequency bands or frequency band combinations used for sidelink carrier aggregation. In some aspects, the first UE may select a sidelink component carrier based at least in part on whether the sidelink component carrier is a licensed or unlicensed sidelink component carrier, whether the sidelink component carrier is associated with a first frequency range or a second frequency range, whether the sidelink component carrier is shared with Uu interface communications, etc.

[0099] In some aspects, the first UE may select a sidelink component carrier based at least in part on capabilities of the first UE and a second UE involved in the link carrier aggregation relative to a number of sidelink component carriers available for transmit and receive operations.

[0100] As an example, a first UE may have established a sidelink connection with a second UE. The first UE may transmit on four sidelink component carriers and receive on four sidelink component carriers. However, the second UE may receive on four sidelink component carriers but transmit on two sidelink component carriers. In this case, the sidelink component carrier used for sidelink HARQ-ACK feedback may be selected from the two sidelink component carriers available for transmission by the second UE.

[0101] In some aspects, the sidelink component carrier used to transmit sidelink HARQ-ACK feedback may be common among a group of UEs or may not be common across a group of UEs. In other words, for communications between a pair of UEs or a group of UEs, the sidelink component carrier used to transmit sidelink HARQ-ACK feedback may be the same across the UEs or may be different between the UEs.

[0102] For example, for sidelink carrier aggregation between a first UE and a second UE, a single sidelink component carrier may be determined to transmit (e.g., send or receive) sidelink HARQ-ACK feedback for both the first UE and the second UE, or a first sidelink component carrier may be determined to transmit sidelink HARQ-ACK feedback for the first UE, and a second sidelink component carrier may be determined to transmit sidelink HARQ-ACK feedback for the second UE. In other words, the first UE may use the first sidelink component carrier to transmit sidelink HARQ-ACK feedback, and the second UE may use the second sidelink component carrier to transmit sidelink HARQ-ACK feedback.

[0103] The first UE may receive communications from the second UE, as indicated by reference numeral 704. For example, the first UE may receive data from the second UE that is to be ACK-NACKed by the first UE.

[0104] As indicated by reference numeral 706, the first UE may use a sidelink component carrier to send sidelink HARQ-ACK feedback to the second UE. The sidelink HARQ-ACK feedback may be sent to the second UE via the PSFCH. The first UE may send the sidelink HARQ-ACK feedback on the sidelink component carrier based at least in part on data received from the second UE (e.g., based at least in part on successful or unsuccessful reception or decoding of the data). The first UE may send the sidelink HARQ-ACK feedback after selecting the sidelink component carrier or after receiving an indication of the sidelink component carrier (e.g., from a base station, a relay node, or a second UE).

[0105] As pointed out above, Figure 7 is provided as an example. Other examples may differ from those described in relation to Figure 7 Examples described.

[0106] Figure 8 is a diagram illustrating an example 800 associated with sidelink component carrier selection for feedback during sidelink carrier aggregation in accordance with various aspects of the present disclosure.

[0107] In some aspects, when a single sidelink component carrier or a subset of sidelink component carriers is selected to transmit sidelink HARQ-ACK feedback, PSFCH transmissions (e.g., sidelink HARQ-ACK feedback transmissions) across multiple sidelink component carriers can be aligned. In some aspects, the PSFCH configuration can be per sidelink resource pool and / or per carrier. In other words, the PSFCH configuration can be common across multiple active UEs on a given sidelink resource pool.

[0108] In some aspects, a sidelink component carrier for transmitting sidelink HARQ-ACK feedback may be selected based at least in part on the application and / or service type to be supported. For example, when there are multiple component carriers with PSFCH resources, the PSFCH configuration may have different periods. An appropriate PSFCH configuration with a given period may be selected based at least in part on the application and / or service type.

[0109] In some aspects, when sidelink carrier aggregation is allowed across sidelink component carriers associated with the same PSFCH configuration, one sidelink component carrier or a subset of sidelink component carriers may be selected to transmit sidelink HARQ-ACK feedback. In other words, one sidelink component carrier or subset may be determined as the sidelink HARQ component carrier. In this case, the UE may not send sidelink HARQ-ACK feedback on other sidelink component carriers. However, the UE's PSSCH transmission and reception in the PSFCH timeslot may be retained, as in a non-carrier aggregation scenario.

[0110] like Figure 8 As shown, a sidelink component carrier group may be configured for a first UE and a second UE. The sidelink component carrier group may include a first sidelink component carrier (SL CC0), a second sidelink component carrier (SL CC1), a third sidelink component carrier (SL CC2), and a fourth sidelink component carrier (SL CC3) associated with a primary cell. In this example, the first sidelink component carrier may include two separate PSFCH resources, and the corresponding PSFCH resources associated with the second sidelink component carrier, the third sidelink component carrier, and the fourth sidelink component carrier may not be used by the first UE and the second UE.

[0111] As pointed out above, Figure 8 is provided as an example. Other examples may differ from those described in relation to Figure 8 Examples described.

[0112] Figure 9 is a diagram illustrating an example 900 associated with sidelink component carrier selection for feedback during sidelink carrier aggregation in accordance with various aspects of the present disclosure.

[0113] In some aspects, sidelink carrier aggregation may be included in an in-band sidelink component carrier set associated with the same PSFCH configuration. In other words, when the in-band sidelink component carriers have the same PSFCH configuration and are included in the sidelink carrier aggregation, at least one in-band sidelink component carrier per in-band sidelink component carrier set may be identified to carry sidelink HARQ-ACK feedback. In some aspects, rate matching may be limited to each in-band sidelink component carrier set.

[0114] like Figure 9As shown, a sidelink component carrier group can be configured for the first UE and the second UE. The sidelink component carrier group can be an in-band sidelink component carrier. The sidelink component carrier group may include a first sidelink packet carrier (SL CC0) and a second sidelink component carrier (SL CC1) associated with the first primary cell, wherein the first sidelink component carrier and the second sidelink component carrier may be associated with the first frequency band. The sidelink component carrier group may include a third sidelink component carrier (SL CC2) and a fourth sidelink component carrier (SL CC3) associated with the second primary cell, wherein the third sidelink component carrier and the fourth sidelink component carrier may be associated with the second frequency band. In this example, the first sidelink component carrier may include two separate PSFCH resources, and the corresponding PSFCH resources associated with the second sidelink component carrier may not be used by the first UE and the second UE. In addition, the third sidelink component carrier may include two separate PSFCH resources, and the corresponding PSFCH resources associated with the fourth sidelink component carrier may not be used by the first UE and the second UE.

[0115] In some aspects, when multiple in-band sidelink component carriers and inter-band sidelink component carriers are associated with the same PSFCH configuration, a single sidelink component carrier may be selected to carry sidelink HARQ-ACK feedback. In some aspects, when some sidelink component carriers are in-band and some are inter-band, one sidelink component carrier may be selected as the sidelink HARQ component carrier. However, in this case, the transmission may be shortened to maintain phase continuity.

[0116] As pointed out above, Figure 9 is provided as an example. Other examples may differ from those described in relation to Figure 9 Examples described.

[0117] Figure 10 is a diagram illustrating an example 1000 associated with sidelink component carrier selection for feedback during sidelink carrier aggregation in accordance with various aspects of the present disclosure.

[0118] In some aspects, a sidelink component carrier may be selected based at least in part on a rate matching pattern applied on a per-sidelink component carrier basis or per-sidelink resource pool basis across the plurality of sidelink component carriers. In other words, when the rate matching pattern is applied on a per-sidelink component carrier basis or on a per-sidelink resource pool basis across the plurality of sidelink component carriers, a single sidelink component carrier or a subset of sidelink component carriers may be selected to carry sidelink HARQ-ACK feedback. In some aspects, the UE may not transmit the PSFCH in other opportunities on other sidelink component carriers or sidelink resource pools, and the UE may shorten transmissions from the UE in time slots associated with the rate matching pattern.

[0119] like Figure 10 As shown, a sidelink component carrier group can be configured for the first UE and the second UE. The sidelink component carrier group may include a first sidelink component carrier (SL CC0), a second sidelink component carrier (SL CC1), a third sidelink component carrier (SL CC2) and a fourth sidelink component carrier (SL CC3) associated with the primary cell. In this example, the first sidelink component carrier may include two separate PSFCH resources. The second sidelink component carrier, the third sidelink component carrier and the fourth sidelink component carrier may be associated with PSFCH resources that are not used by the first UE and the second UE. In addition, a rate matching mode may be applied across the first sidelink component carrier, the second sidelink component carrier, the third sidelink component carrier and the fourth sidelink component carrier, and the first UE and the second UE may shorten transmissions in time slots associated with the rate matching mode.

[0120] As pointed out above, Figure 10 is provided as an example. Other examples may differ from those described in relation to Figure 10 Examples described.

[0121] Figure 11 is a diagram illustrating an example 1100 associated with sidelink component carrier selection for feedback during sidelink carrier aggregation in accordance with various aspects of the present disclosure.

[0122] In some aspects, a sidelink component carrier may be selected based at least in part on a rate matching pattern applied per frequency band across multiple in-band sidelink component carriers. In other words, when the rate matching pattern is applied on a per-frequency band basis (e.g., for multiple in-band sidelink component carriers), a single sidelink component carrier or a subset of sidelink component carriers per frequency band may be selected to carry sidelink HARQ-ACK feedback. On a per-frequency band basis, the UE may not transmit the PSFCH in other sidelink component carriers or other occasions in the sidelink resource pool, and the UE may shorten transmissions from the UE in time slots associated with the rate matching pattern.

[0123] like Figure 11 As shown, a sidelink component carrier group can be configured for a first UE and a second UE. The sidelink component carrier group can be an in-band sidelink component carrier. The sidelink component carrier group may include a first sidelink packet carrier (SL CC0) and a second sidelink component carrier (SL CC1) associated with a first primary cell, wherein the first sidelink component carrier and the second sidelink component carrier may be associated with a first frequency band. The sidelink component carrier group may include a third sidelink component carrier (SL CC2) and a fourth sidelink component carrier (SL CC3) associated with a second primary cell, wherein the third sidelink component carrier and the fourth sidelink component carrier may be associated with a second frequency band. In this example, the first sidelink component carrier may include two separate PSFCH resources. The second sidelink component carrier may be associated with a PSFCH resource that is not used by the first UE and the second UE. A rate matching mode may be applied across the first sidelink component carrier and the second sidelink component carrier, and the first UE and the second UE may shorten transmissions in time slots associated with the rate matching mode. Furthermore, the third sidelink component carrier may include two separate PSFCH resources, and the corresponding PSFCH resources associated with the fourth sidelink component carrier may not be used by the first UE and the second UE.

[0124] As pointed out above, Figure 11 is provided as an example. Other examples may differ from those described in relation to Figure 11 Examples described.

[0125] Figure 12 is a diagram illustrating an example process 1200, performed, for example, by a first UE, in accordance with various aspects of the present disclosure. Example process 1200 is an example of operations in which a first UE (e.g., UE 120) performs sidelink component carrier selection for feedback during sidelink carrier aggregation.

[0126] like Figure 12As shown, in some aspects, process 1200 may include receiving a communication from a second UE (block 1210). For example, the first UE (e.g., using antenna 252, demodulator 254, MIMO detector 256, receive processor 258, controller / processor 280, and / or memory 282) may receive a communication from the second UE, as described above.

[0127] like Figure 12 As further shown, in some aspects, process 1200 may include transmitting sidelink HARQ-ACK feedback to the second UE using a sidelink component carrier based at least in part on communications received from the second UE, wherein the sidelink component carrier is associated with transmitting sidelink HARQ-ACK feedback when sidelink carrier aggregation is configured for a UE group including the first UE and the second UE (block 1220). For example, the first UE (e.g., using antenna 252, transmit processor 264, TX MIMO processor 266, modulator 254, controller / processor 280, and / or memory 282) may transmit sidelink hybrid automatic repeat request acknowledgement (HARQ-ACK) feedback to the second UE using a sidelink component carrier based at least in part on communications received from the second UE, wherein the sidelink component carrier is associated with transmitting sidelink HARQ-ACK feedback when sidelink carrier aggregation is configured for a UE group including the first UE and the second UE, as described above.

[0128] Process 1200 may include additional aspects, such as any single aspect or any combination of the aspects described below and / or in conjunction with one or more other processes described elsewhere herein.

[0129] In a first aspect, a sidelink component carrier is associated with a sidelink resource pool for transmitting sidelink HARQ-ACK feedback.

[0130] In a second aspect, alone or in combination with the first aspect, a sidelink component carrier group comprising sidelink component carriers is pre-configured for a UE group, wherein the sidelink component carrier group is associated with the same sidelink feedback channel configuration, different sidelink feedback channel configurations, or is not associated with a sidelink feedback channel configuration.

[0131] In a third aspect, alone or in combination with one or more of the first and second aspects, the sidelink component carrier is included in a subset of sidelink component carriers, wherein the subset is part of a plurality of sidelink component carriers.

[0132] In a fourth aspect, alone or in combination with one or more of aspects 1 to 3, process 1200 comprises receiving an indication of a sidelink component carrier associated with transmitting sidelink HARQ-ACK feedback, wherein the sidelink component carrier is associated with a sidelink feedback channel configuration.

[0133] In a fifth aspect, alone or in combination with one or more of the first to fourth aspects, the indication is received from a base station.

[0134] In a sixth aspect, alone or in combination with one or more of the first to fifth aspects, the indication is received from the base station via the relay node.

[0135] In a seventh aspect, alone or in combination with one or more of the first to sixth aspects, the indication is received from the second UE via a sidelink connection between the first UE and the second UE.

[0136] In an eighth aspect, alone or in combination with one or more of aspects 1 to 7, the sidelink component carrier associated with the indication is selected from a group of sidelink component carriers configured to potentially carry sidelink HARQ-ACK feedback.

[0137] In a ninth aspect, alone or in combination with one or more of the first to eighth aspects, the sidelink component carrier used to transmit sidelink HARQ-ACK feedback to the second UE is specific to the sidelink connection between the first UE and the second UE.

[0138] In a tenth aspect, alone or in combination with one or more of the first to ninth aspects, a sidelink component carrier used to transmit sidelink HARQ-ACK feedback is associated with a sidelink feedback channel configuration.

[0139] In an eleventh aspect, alone or in combination with one or more of the first to tenth aspects, the sidelink component carrier is selected from a sidelink component carrier group associated with a sidelink feedback channel configuration.

[0140] In a twelfth aspect, alone or in combination with one or more of the first to eleventh aspects, the sidelink component carrier corresponds to an initial sidelink component carrier used for discovery and link establishment between the first UE and the second UE.

[0141] In a thirteenth aspect, alone or in combination with one or more of the first to twelfth aspects, the sidelink component carrier is associated with a smallest index relative to other sidelink component carriers in the sidelink component carrier group.

[0142] In a fourteenth aspect, alone or in combination with one or more of aspects one to thirteen, the sidelink component carrier is selected based at least in part on a sidelink feedback channel configuration associated with a sidelink component carrier group including the sidelink component carrier, wherein the sidelink feedback channel configuration indicates a number of resource blocks, supported sidelink feedback channel formats and a periodicity.

[0143] In a fifteenth aspect, alone or in combination with one or more of the first to fourteenth aspects, the sidelink component carrier is selected by one or more of the first UE or the second UE.

[0144] In the sixteenth aspect, alone or in combination with one or more of the first to fifteenth aspects, the sidelink component carrier is selected based at least in part on: a source ID, a destination ID, an area ID, a broadcast type including unicast, multicast or broadcast, a channel busy rate, a transmission priority, a processing timeline of the first UE or the second UE, an application, or a service type.

[0145] In a seventeenth aspect, alone or in combination with one or more of the first to sixteenth aspects, the sidelink component carrier is selected based at least in part on one or more frequency bands or frequency band combinations used for sidelink carrier aggregation.

[0146] In an eighteenth aspect, alone or in combination with one or more of the first to seventeenth aspects, the sidelink component carrier is selected based at least in part on whether the sidelink component carrier is a licensed carrier or an unlicensed carrier.

[0147] In a nineteenth aspect, alone or in combination with one or more of aspects 1 to 18, the sidelink component carrier is selected based at least in part on whether the sidelink component carrier is associated with the first frequency range or the second frequency range.

[0148] In a twentieth aspect, alone or in combination with one or more of the first to nineteenth aspects, the sidelink component carrier is selected based at least in part on whether the sidelink component carrier is shared with Uu interface communications.

[0149] In aspect 21, alone or in combination with one or more of aspects 1 to 20, the sidelink component carrier is selected based at least in part on the capabilities of the first UE and the second UE relative to the number of sidelink component carriers available for transmission and reception.

[0150] In a twenty-second aspect, alone or in combination with one or more of the first to twenty-first aspects, a sidelink component carrier used to transmit sidelink HARQ-ACK feedback is common among the UE group.

[0151] In a twenty-third aspect, alone or in combination with one or more of the first to twenty-second aspects, the sidelink component carrier used to transmit sidelink HARQ-ACK feedback is different among the UE groups.

[0152] In a twenty-fourth aspect, alone or in combination with one or more of the first to twenty-third aspects, sidelink carrier aggregation is allowed across sidelink component carriers associated with the same sidelink feedback channel configuration.

[0153] In a twenty-fifth aspect, alone or in combination with one or more of aspects one to twenty-fourth, sidelink carrier aggregation is included in a set of in-band sidelink component carriers associated with the same sidelink feedback channel configuration.

[0154] In aspect 26, alone or in combination with one or more of aspects 1 to 25, the sidelink component carrier is selected based at least in part on a rate matching pattern applied for each sidelink component carrier or for each sidelink resource pool across multiple sidelink component carriers, or the sidelink component carrier is selected based at least in part on a rate matching pattern applied for each frequency band across multiple in-band sidelink component carriers.

[0155] Although Figure 12 Example blocks of process 1200 are shown, but in some aspects, process 1200 may include Figure 12 The blocks may be additional blocks, fewer blocks, different blocks, or blocks arranged in a different manner than those depicted in process 1200. Additionally or alternatively, two or more blocks of the blocks of process 1200 may be executed in parallel.

[0156] Figure 13 1 is a diagram illustrating an example process 1300, performed, for example, by a first UE, in accordance with various aspects of the present disclosure. Example process 1300 is an example of operations in which a first UE (e.g., UE 120) performs sidelink component carrier selection for feedback during sidelink carrier aggregation. Note that in example process 1300, the first UE and the second UE are reversed relative to example process 1200.

[0157] like Figure 13As shown, in some aspects, process 1300 may include transmitting data to a second UE (block 1310). For example, the UE (e.g., using antenna 252, transmit processor 264, TX MIMO processor 266, modulator 254, controller / processor 280, and / or memory 282) may transmit data to the second UE, as described above.

[0158] like Figure 13 As further shown, in some aspects, process 1300 may include receiving sidelink HARQ-ACK feedback from the second UE via a sidelink component carrier based at least in part on data transmitted to the second UE, wherein the sidelink component carrier is associated with transmitting sidelink HARQ-ACK feedback when sidelink carrier aggregation is configured for a UE group including the first UE and the second UE (block 1320). For example, the first UE (e.g., using antenna 252, demodulator 254, MIMO detector 256, receive processor 258, controller / processor 280, and / or memory 282) may receive sidelink hybrid automatic repeat request acknowledgement (HARQ-ACK) feedback from the second UE via a sidelink component carrier based at least in part on data transmitted to the second UE, wherein the sidelink component carrier is associated with transmitting sidelink HARQ-ACK feedback when sidelink carrier aggregation is configured for a UE group including the first UE and the second UE, as described above.

[0159] Process 1300 may include additional aspects, such as any single aspect or any combination of the aspects described below and / or in conjunction with one or more other processes described elsewhere herein.

[0160] Although Figure 13 Example blocks of process 1300 are shown, but in some aspects, process 1300 may include Figure 13 1300. In some embodiments, the process 1300 may include additional blocks, fewer blocks, different blocks, or blocks arranged in a different manner than those depicted in the process 1300. Additionally or alternatively, two or more blocks of the blocks in the process 1300 may be executed in parallel.

[0161] Figure 14 1 is a block diagram of an example apparatus 1400 for wireless communication. Apparatus 1400 may be a first UE, or the first UE may include apparatus 1400. In some aspects, apparatus 1400 includes a receiving component 1402 and a transmitting component 1404, which may communicate with each other (e.g., via one or more buses and / or one or more other components). As shown, apparatus 1400 may communicate with another apparatus 1406 (such as a UE, a base station, or another wireless communication device) using receiving component 1402 and transmitting component 1404.

[0162] In some aspects, the apparatus 1400 may be configured to perform the Figure 7-11 Additionally or alternatively, the apparatus 1400 may be configured to perform one or more of the processes described herein, such as Figure 12 Course 1200 and / or Figure 13 Process 1300. In some aspects, Figure 14 The apparatus 1400 and / or one or more components shown in FIG. 1 may include the above-mentioned apparatus 1400 and / or one or more components ... Figure 2 Additionally or alternatively, Figure 14 One or more components shown in the above may be combined Figure 2 In addition or alternatively, one or more components in the component set may be at least partially implemented as software stored in a 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.

[0163] The receiving component 1402 may receive communications, such as reference signals, control information, data communications, or a combination thereof, from the apparatus 1406. The receiving component 1402 may provide the received communications to one or more other components of the apparatus 1400. In some aspects, the receiving component 1402 may perform signal processing (e.g., filtering, amplification, demodulation, analog-to-digital conversion, demultiplexing, deinterleaving, demapping, equalization, interference cancellation, or decoding, among other examples) on the received communications and may provide the processed signals to one or more other components of the apparatus 1406. In some aspects, the receiving component 1402 may include the processing described above in conjunction with Figure 2 One or more antennas, demodulators, MIMO detectors, receive processors, controllers / processors, memories, or combinations thereof of the described first UE.

[0164] The transmitting component 1404 may transmit communications, such as reference signals, control information, data communications, or a combination thereof, to the apparatus 1406. In some aspects, one or more other components of the apparatus 1406 may generate communications and may provide the generated communications to the transmitting component 1404 for transmission to the apparatus 1406. In some aspects, the transmitting component 1404 may perform signal processing (e.g., filtering, amplification, modulation, digital-to-analog conversion, multiplexing, interleaving, mapping, or encoding, among other examples) on the generated communications and may transmit the processed signals to the apparatus 1406. In some aspects, the transmitting component 1404 may include the components described above in conjunction with Figure 2One or more antennas, modulators, transmit MIMO processors, transmit processors, controllers / processors, memories, or combinations thereof of the described first UE. In some aspects, the transmit component 1404 can be co-located with the receive component 1402 in a transceiver.

[0165] The receiving component 1402 can receive communications from the second UE. The transmitting component 1404 can transmit sidelink HARQ-ACK feedback to the second UE using a sidelink component carrier associated with transmitting sidelink HARQ-ACK feedback when sidelink carrier aggregation is configured for a UE group including the first UE and the second UE based at least in part on the communications received from the second UE.

[0166] The transmitting component 1404 can transmit data to the second UE. The receiving component 1402 can receive sidelink HARQ-ACK feedback from the second UE via a sidelink component carrier based at least in part on the data transmitted to the second UE, wherein the sidelink component carrier is associated with transmitting sidelink HARQ-ACK feedback when sidelink carrier aggregation is configured for a UE group including the first UE and the second UE.

[0167] Receiving component 1402 may receive an indication of a sidelink component carrier associated with transmitting sidelink HARQ-ACK feedback, wherein the sidelink component carrier is associated with a sidelink feedback channel configuration.

[0168] Figure 14 The number and arrangement of components shown are provided as examples. In practice, there may be Figure 14 The components shown may include additional components, fewer components, different components, or components arranged differently than those shown. Figure 14 Two or more components shown may be implemented in a single component, or Figure 14 The single component shown may be implemented as multiple distributed components. Additionally or alternatively, Figure 14 The illustrated set of (one or more) components may perform the operations described as being performed by Figure 14 Another group of components is shown performing one or more functions.

[0169] The following provides a summary of various aspects of the present disclosure:

[0170] Aspect 1: A method of wireless communication performed by a first user equipment (UE), comprising: receiving communications from a second UE; and sending sidelink hybrid automatic repeat request acknowledgement (HARQ-ACK) feedback to the second UE using a sidelink component carrier based at least in part on the communications received from the second UE, wherein the sidelink component carrier is associated with transmitting the sidelink HARQ-ACK feedback when sidelink carrier aggregation is configured for a UE group including the first UE and the second UE.

[0171] Aspect 2: The method according to aspect 1, wherein the sidelink component carrier is associated with a sidelink resource pool used to transmit the sidelink HARQ-ACK feedback.

[0172] Aspect 3: A method according to any one of Aspects 1 to 2, wherein a sidelink component carrier group including the sidelink component carrier is pre-configured for the UE group, wherein the sidelink component carrier group is associated with the same sidelink feedback channel configuration, different sidelink feedback channel configurations, or is not associated with a sidelink feedback channel configuration.

[0173] Aspect 4: The method according to any one of aspects 1 to 3, wherein the sidelink component carrier is included in a subset of sidelink component carriers, wherein the subset is part of a plurality of sidelink component carriers.

[0174] Aspect 5: The method according to any one of aspects 1 to 4 further includes: receiving an indication of the sidelink component carrier associated with transmitting the sidelink HARQ-ACK feedback, wherein the sidelink component carrier is associated with a sidelink feedback channel configuration.

[0175] Aspect 6: The method according to aspect 5, wherein the indication is received from a base station.

[0176] Aspect 7: The method according to any one of aspects 5 to 6, wherein the indication is received from the base station via a relay node.

[0177] Aspect 8: The method according to any one of aspects 5 to 7, wherein the indication is received from the second UE via a sidelink connection between the first UE and the second UE.

[0178] Aspect 9: The method according to any one of aspects 5 to 8, wherein the sidelink component carrier associated with the indication is selected from a group of sidelink component carriers configured to potentially carry the sidelink HARQ-ACK feedback.

[0179] Aspect 10: The method according to any one of aspects 1 to 9, wherein the sidelink component carrier used to transmit the sidelink HARQ-ACK feedback to the second UE is specific to the sidelink connection between the first UE and the second UE.

[0180] Aspect 11: The method according to any one of aspects 1 to 10, wherein the sidelink component carrier used to transmit the sidelink HARQ-ACK feedback is associated with a sidelink feedback channel configuration.

[0181] Aspect 12: The method according to any one of aspects 1 to 11, wherein the sidelink component carrier is selected from a sidelink component carrier group associated with a sidelink feedback channel configuration.

[0182] Aspect 13: The method according to any one of aspects 1 to 12, wherein the sidelink component carrier corresponds to an initial sidelink component carrier used for discovery and link establishment between the first UE and the second UE.

[0183] Aspect 14: The method according to any one of aspects 1 to 13, wherein the sidelink component carrier is associated with a smallest index relative to other sidelink component carriers in the sidelink component carrier group.

[0184] Aspect 15: A method according to any one of Aspects 1 to 14, wherein the sidelink component carrier is selected at least in part based on a sidelink feedback channel configuration associated with a sidelink component carrier group including the sidelink component carrier, wherein the sidelink feedback channel configuration indicates the number of resource blocks, supported sidelink feedback channel formats and periodicity.

[0185] Aspect 16: The method according to any one of aspects 1 to 15, wherein the sidelink component carrier is selected by one or more of the first UE or the second UE.

[0186] Aspect 17: A method according to any one of Aspects 1 to 16, wherein the sidelink component carrier is selected at least in part based on: a source identifier (ID), a destination ID, an area ID, a broadcast type including unicast, groupcast or broadcast, a channel busy rate, a transmission priority, a processing timeline of the first UE or the second UE, an application, or a service type.

[0187] Aspect 18: The method of any one of aspects 1 to 17, wherein the sidelink component carrier is selected based at least in part on one or more frequency bands or frequency band combinations used for the sidelink carrier aggregation.

[0188] Aspect 19: The method of any one of aspects 1 to 18, wherein the sidelink component carrier is selected based at least in part on whether the sidelink component carrier is a licensed carrier or an unlicensed carrier.

[0189] Aspect 20: The method of any one of aspects 1 to 19, wherein the sidelink component carrier is selected based at least in part on whether the sidelink component carrier is associated with a first frequency range or a second frequency range.

[0190] Aspect 21: The method according to any one of aspects 1 to 20, wherein the sidelink component carrier is selected based at least in part on whether the sidelink component carrier is shared with Uu interface communication.

[0191] Aspect 22: A method according to any one of Aspects 1 to 21, wherein the sidelink component carrier is selected at least in part based on the capabilities of the first UE and the second UE relative to the number of sidelink component carriers available for transmission and reception.

[0192] Aspect 23: The method according to any one of aspects 1 to 22, wherein the sidelink component carrier used to transmit the sidelink HARQ-ACK feedback is common among the UE group.

[0193] Aspect 24: The method according to any one of aspects 1 to 23, wherein the sidelink component carrier used to transmit the sidelink HARQ-ACK feedback is different among the UE group.

[0194] Aspect 25: The method according to any one of aspects 1 to 24, wherein the sidelink carrier aggregation is allowed across sidelink component carriers associated with the same sidelink feedback channel configuration.

[0195] Aspect 26: The method according to any one of aspects 1 to 25, wherein the sidelink carrier aggregation is included in a set of in-band sidelink component carriers associated with the same sidelink feedback channel configuration.

[0196] Aspect 27: A method according to any one of Aspects 1 to 26, wherein: the sidelink component carrier is selected at least in part based on a rate matching pattern applied for each sidelink component carrier or for each sidelink resource pool across multiple sidelink component carriers; or the sidelink component carrier is selected at least in part based on a rate matching pattern applied for each frequency band across multiple in-band sidelink component carriers.

[0197] Aspect 28: A method of wireless communication performed by a first user equipment (UE), comprising: sending data to a second UE; and receiving sidelink hybrid automatic repeat request acknowledgment (HARQ-ACK) feedback from the second UE via a sidelink component carrier based at least in part on the data sent to the second UE, wherein the sidelink component carrier is associated with transmitting the sidelink HARQ-ACK feedback when sidelink carrier aggregation is configured for a UE group including the first UE and the second UE.

[0198] Aspect 29: An apparatus for wireless communication at a device, comprising: a processor; a memory coupled to the processor; and instructions, the instructions being stored in the memory and executable by the processor to cause the apparatus to perform a method according to one or more of Aspects 1-27.

[0199] Aspect 30: 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 configured to perform the method according to one or more of aspects 1-27.

[0200] Aspect 31: An apparatus for wireless communication, comprising at least one means for performing the method according to one or more of aspects 1-27.

[0201] Aspect 32: A non-transitory computer-readable medium storing code for wireless communication, the code comprising instructions executable by a processor to perform the method according to one or more of aspects 1-27.

[0202] Aspect 33: A non-transitory computer-readable medium storing an instruction set for wireless communication, the instruction set comprising one or more instructions that, when executed by one or more processors of a device, cause the device to perform a method according to one or more of aspects 1-27.

[0203] Aspect 34: 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 aspect 28.

[0204] Aspect 35: 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 configured to perform the method according to aspect 28.

[0205] Aspect 36: An apparatus for wireless communication, comprising at least one means for performing the method of aspect 28.

[0206] Aspect 37: A non-transitory computer-readable medium storing code for wireless communication, the code comprising instructions executable by a processor to perform the method according to aspect 28.

[0207] Aspect 38: A non-transitory computer-readable medium storing an instruction set for wireless communication, the instruction set comprising one or more instructions that, when executed by one or more processors of a device, cause the device to perform the method of aspect 28.

[0208] The foregoing disclosure provides illustration and description, but is not intended to be exhaustive or to limit the aspects to the precise forms disclosed. Modifications and variations are possible in light of the above disclosure or may be acquired from practice of the aspects.

[0209] As used herein, the term "component" is intended to be broadly interpreted as hardware, firmware, and / or a combination of hardware and software. As used herein, a processor is implemented using hardware, firmware, and / or a combination of hardware and software. It will be apparent that the systems and / or methods described herein may be implemented using different forms of hardware, firmware, and / or a combination of hardware and software. The actual specialized control hardware or software code used to implement these systems and / or methods is not limiting in any way. Therefore, the operation and behavior of the systems and / or methods are described herein without reference to specific software code, it being understood that software and hardware may be designed to implement the systems and / or methods based, at least in part, on the description herein.

[0210] As used herein, satisfying a threshold may refer to a value being greater than a threshold, greater than or equal to a threshold, less than a threshold, less than or equal to a threshold, equal to a threshold, not equal to a threshold, etc., depending on the context.

[0211] Even if the specific combination of features is recorded in the claims and / or disclosed in the specification, these combinations are not intended to limit the disclosure of each aspect. In fact, many features in these features can be combined in a manner not specifically recorded in the claims and / or specifically disclosed in the specification. Although each dependent claim listed below can only directly depend on one claim, the disclosure of each aspect includes the combination of each dependent claim and each other claim in the claim set. The phrase of "at least one of" the list of items refers to any combination of those items, including single members. For example, "at least one of the following: a, b or c" is intended to cover a, b, c, ab, ac, bc and abc, and any combination with the multiple of the same element (for example, aa, aaa, aab, aac, abb, acc, bb, bbb, bbc, cc and ccc or any other sorting of a, b and c).

[0212] None of the elements, actions or instructions used herein should be interpreted as key or necessary, unless clearly described as such. In addition, as used herein, the articles "a" and "an" are intended to include one or more projects, and can be used interchangeably with "one or more". In addition, as used herein, the article "the" is intended to include one or more projects quoted in conjunction with the article "the", and can be used interchangeably with "one or more". In addition, as used herein, the terms "set" and "group" are intended to include one or more projects (for example, related projects, unrelated projects, the combination of related projects and unrelated projects, etc.), and can be used interchangeably with "one or more". In the case of only expecting a project, phrase "only one" or similar language is used. In addition, as used herein, the terms "have", "have", "have" etc. are intended to be open terms. In addition, unless otherwise clearly stated, phrase "based on" is intended to mean "at least partially based on". Furthermore, as used herein, the term "or" when used in a series is intended to be inclusive and can be used interchangeably with "and / or" unless expressly stated otherwise (e.g., if used in conjunction with "either" or "only one of").

Claims

1. A method of wireless communication performed by a first user equipment (UE), comprising: receiving a communication from a second UE; as well as sending sidelink hybrid automatic repeat request acknowledgement (HARQ-ACK) feedback to the second UE using a sidelink component carrier based at least in part on the communication received from the second UE, wherein the sidelink component carrier is associated with transmitting the sidelink HARQ-ACK feedback when sidelink carrier aggregation is configured for a UE group including the first UE and the second UE, The sidelink component carrier is selected at least in part based on: (i) a rate matching pattern applied across multiple sidelink component carriers and for each sidelink component carrier or for each sidelink resource pool; or (ii) a rate matching pattern applied according to frequency band and across multiple in-band sidelink component carriers.

2. The method according to claim 1, wherein The sidelink component carrier is associated with a sidelink resource pool for transmitting the sidelink HARQ-ACK feedback.

3. The method according to claim 1, wherein A sidelink component carrier group including the sidelink component carrier is pre-configured for the UE group, wherein the sidelink component carrier group is associated with the same sidelink feedback channel configuration, different sidelink feedback channel configurations, or is not associated with a sidelink feedback channel configuration.

4. The method according to claim 1, wherein The sidelink component carrier is included in a subset of sidelink component carriers, wherein the subset is a portion of a plurality of sidelink component carriers.

5. The method according to claim 1, further comprising: An indication of the sidelink component carrier associated with transmitting the sidelink HARQ-ACK feedback is received, wherein the sidelink component carrier is associated with a sidelink feedback channel configuration.

6. The method according to claim 5, wherein: The indication is received from a base station.

7. The method according to claim 5, wherein: The indication is received from the base station via the relay node.

8. The method according to claim 5, wherein The indication is received from the second UE via a sidelink connection between the first UE and the second UE.

9. The method according to claim 5, wherein: The sidelink component carrier associated with the indication is selected from a group of sidelink component carriers configured to potentially carry the sidelink HARQ-ACK feedback.

10. The method according to claim 1, wherein The sidelink component carrier used to transmit the sidelink HARQ-ACK feedback to the second UE is specific to a sidelink connection between the first UE and the second UE.

11. The method according to claim 1, wherein The sidelink component carrier used to transmit the sidelink HARQ-ACK feedback is associated with a sidelink feedback channel configuration.

12. The method according to claim 1, wherein The sidelink component carrier is selected from a group of sidelink component carriers associated with a sidelink feedback channel configuration.

13. The method according to claim 1, wherein The sidelink component carrier corresponds to an initial sidelink component carrier used for discovery and link establishment between the first UE and the second UE.

14. The method according to claim 1, wherein The sidelink component carrier is associated with a smallest index relative to other sidelink component carriers in the sidelink component carrier group.

15. The method according to claim 1, wherein The sidelink component carrier is selected based at least in part on a sidelink feedback channel configuration associated with a sidelink component carrier group that includes the sidelink component carrier, wherein the sidelink feedback channel configuration indicates a number of resource blocks, supported sidelink feedback channel formats, and a periodicity.

16. The method according to claim 1, wherein The sidelink component carrier is selected by one or more of the first UE or the second UE.

17. The method according to claim 1, wherein The sidelink component carrier is selected based at least in part on a source identifier (ID), a destination ID, an area ID, a broadcast type including unicast, multicast, or broadcast, a channel busyness rate, a transmission priority, a processing timeline of the first UE or the second UE, an application, or a service type.

18. The method according to claim 1, wherein The sidelink component carrier is selected based at least in part on one or more frequency bands or frequency band combinations used for the sidelink carrier aggregation.

19. The method according to claim 1, wherein The sidelink component carrier is selected based at least in part on whether the sidelink component carrier is a licensed carrier or an unlicensed carrier.

20. The method according to claim 1, wherein The sidelink component carrier is selected based at least in part on whether the sidelink component carrier is associated with a first frequency range or a second frequency range.

21. The method according to claim 1, wherein The sidelink component carrier is selected based at least in part on whether the sidelink component carrier is shared with Uu interface communications.

22. The method according to claim 1, wherein The sidelink component carrier is selected based at least in part on capabilities of the first UE and the second UE relative to a number of sidelink component carriers available for transmission and reception.

23. The method according to claim 1, wherein The sidelink component carrier used to transmit the sidelink HARQ-ACK feedback is common among the UE group.

24. The method according to claim 1, wherein The sidelink component carrier used to transmit the sidelink HARQ-ACK feedback is different among the UE group.

25. The method according to claim 1, wherein The sidelink carrier aggregation is allowed across sidelink component carriers associated with the same sidelink feedback channel configuration.

26. The method according to claim 1, wherein The sidelink carrier aggregation is included in a set of in-band sidelink component carriers associated with the same sidelink feedback channel configuration.

27. A method of wireless communication performed by a first user equipment (UE), comprising: sending data to a second UE; as well as After sending the data to the second UE, receiving sidelink hybrid automatic repeat request acknowledgement (HARQ-ACK) feedback from the second UE via a sidelink component carrier associated with transmitting the sidelink HARQ-ACK feedback when sidelink carrier aggregation is configured for a UE group including the first UE and the second UE, The sidelink component carrier is selected at least in part based on: (i) a rate matching pattern applied across multiple sidelink component carriers and for each sidelink component carrier or for each sidelink resource pool; or (ii) a rate matching pattern applied according to frequency band and across multiple in-band sidelink component carriers.

28. A first user equipment (UE) for wireless communication, comprising: Memory; as well as One or more processors operatively coupled to the memory, the memory and the one or more processors configured to perform the method according to any one of claims 1 to 26.

29. A first user equipment (UE) for wireless communication, comprising: Memory; as well as one or more processors operatively coupled to the memory, the memory and the one or more processors configured to: sending data to a second UE; as well as After sending the data to the second UE, receiving sidelink hybrid automatic repeat request acknowledgement (HARQ-ACK) feedback from the second UE via a sidelink component carrier associated with transmitting the sidelink HARQ-ACK feedback when sidelink carrier aggregation is configured for a UE group including the first UE and the second UE, The sidelink component carrier is selected at least in part based on: (i) a rate matching pattern applied across multiple sidelink component carriers and for each sidelink component carrier or for each sidelink resource pool; or (ii) a rate matching pattern applied according to frequency band and across multiple in-band sidelink component carriers.

Images