Techniques for priority handling of simultaneous physical sidelink feedback channels in sidelink unlicenses

Abstract

Various aspects of the present disclosure generally relate to wireless communications. In some aspects, a responding user equipment (UE) may receive, on an unlicensed sidelink channel, a plurality of physical sidelink shared channel (PSSCH) transmissions associated with a physical sidelink feedback channel (PSFCH) transmission occasion, where at least one PSFCH transmission in the PSFCH transmission occasion is in a shared channel occupancy time (COT). The UE may determine a minimum number of PSFCH transmissions to be transmitted in the PSFCH transmission occasion. The UE may select, based at least in part on whether a plurality of scheduled PSFCH transmissions associated with the PSFCH transmission occasion are in the shared COT, a set of PSFCH transmissions including at least the minimum number of PSFCH transmissions among the scheduled PSFCH transmissions. The UE may transmit the selected set of PSFCH transmissions on the unlicensed sidelink channel in the PSFCH transmission opportunity. Numerous other aspects are described.

Description

Technical Field

[0001] Aspects of the present disclosure relate generally to wireless communications and to techniques and apparatus associated with priority handling for simultaneous physical sidelink feedback channels (PSFCHs) in sidelink unlicensed (SL-U).

[0002] Related technical description

[0003] Wireless communication systems are widely deployed to provide a variety of telecommunication services, such as telephony, video, data, messaging, and broadcasts. 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).

[0004] A wireless network may include one or more network nodes that support communication for wireless communication devices, such as user equipment (UE) or multiple UEs. The UE may communicate with the network node via downlink and uplink communications. A "downlink" (or "DL") refers to the communication link from the network node to the UE, and an "uplink" (or "UL") refers to the communication link from the UE to the network node. Some wireless networks may support device-to-device communication, such as via a local link (e.g., a sidelink (SL), a wireless local area network (WLAN) link, and / or a wireless personal area network (WPAN) link, etc.).

[0005] These multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different UEs to communicate at a city, country, region, or global level. New Radio (NR), which may also be referred to as 5G, is a set of enhancements to the LTE mobile standard promulgated by 3GPP. NR is designed to better support mobile broadband Internet access by: improving 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 and CP-OFDM or single carrier frequency division multiplexing (SC-FDM) (also known as discrete Fourier transform spread OFDM (DFT-s-OFDM) on the uplink to better integrate with other open standards; as well as supporting beamforming, multiple-input multiple-output (MIMO) antenna technology, and carrier aggregation. Summary of the Invention

[0006] Some aspects described herein relate to a method for wireless communication performed by a responsive user equipment (UE). The method may include receiving, on an unlicensed sidelink channel, a plurality of physical sidelink shared channel (PSSCH) transmissions associated with a physical sidelink feedback channel (PSFCH) transmission opportunity, wherein at least one of the PSFCH transmission opportunities is transmitted in a shared channel occupancy time (COT). The method may include determining a minimum number of PSFCH transmissions to be transmitted in the PSFCH transmission opportunity. The method may include selecting a set of PSFCH transmissions including at least a minimum number of PSFCH transmissions among the scheduled PSFCH transmissions based at least in part on whether the plurality of scheduled PSFCH transmissions associated with the PSFCH transmission opportunity are in a shared COT. The method may include transmitting the selected set of PSFCH transmissions on the unlicensed sidelink channel in the PSFCH transmission opportunity.

[0007] Some aspects described herein relate to a response UE for wireless communication. The response UE may include a memory and one or more processors coupled to the memory. The one or more processors may be configured to receive multiple PSSCH transmissions associated with PSFCH transmission opportunities on an unlicensed sidelink channel, wherein at least one PSFCH transmission in the PSFCH transmission opportunities is in a shared COT. The one or more processors may be configured to determine a minimum number of PSFCH transmissions to be sent in the PSFCH transmission opportunity. The one or more processors may be configured to select a set of PSFCH transmissions including at least the minimum number of PSFCH transmissions among the scheduled PSFCH transmissions based at least in part on whether the multiple scheduled PSFCH transmissions associated with the PSFCH transmission opportunity are in the shared COT. The one or more processors may be configured to send the selected set of PSFCH transmissions on the unlicensed sidelink channel in the PSFCH transmission opportunity.

[0008] Certain aspects described herein relate to a non-transitory computer-readable medium storing a set of instructions for wireless communication by a responsive UE. The set of instructions, when executed by one or more processors of the UE, may cause the UE to receive multiple PSFCH transmissions associated with PSFCH transmission opportunities on an unlicensed sidelink channel, wherein at least one of the PSFCH transmission opportunities is within a shared COT. The set of instructions, when executed by the one or more processors of the UE, may cause the UE to determine a minimum number of PSFCH transmissions to be transmitted in the PSFCH transmission opportunity. The set of instructions, when executed by the one or more processors of the UE, may cause the UE to select a set of PSFCH transmissions including at least the minimum number of PSFCH transmissions among scheduled PSFCH transmissions based at least in part on whether the multiple scheduled PSFCH transmissions associated with the PSFCH transmission opportunity are within the shared COT. The set of instructions, when executed by the one or more processors of the UE, may cause the UE to transmit the selected set of PSFCH transmissions on the unlicensed sidelink channel in the PSFCH transmission opportunity.

[0009] Some aspects described herein relate to an apparatus for wireless communication. The apparatus may include means for receiving multiple PSFCH transmissions associated with PSFCH transmission opportunities on an unlicensed sidelink channel, wherein at least one PSFCH transmission in the PSFCH transmission opportunities is in a shared COT. The apparatus may include means for determining a minimum number of PSFCH transmissions to be sent in the PSFCH transmission opportunity. The apparatus may include means for selecting a set of PSFCH transmissions including at least the minimum number of PSFCH transmissions among scheduled PSFCH transmissions based at least in part on whether the multiple scheduled PSFCH transmissions associated with the PSFCH transmission opportunity are in the shared COT. The apparatus may include means for transmitting the selected set of PSFCH transmissions on the unlicensed sidelink channel in the PSFCH transmission opportunity.

[0010] The various aspects collectively include methods, apparatus, systems, computer program products, non-transitory computer-readable media, user equipment, base stations, network entities, network nodes, wireless communication devices, and / or processing systems as fully described herein with reference to the accompanying drawings and description, and as illustrated in the accompanying drawings and description.

[0011] The features and technical advantages of the examples according to the present disclosure have been outlined quite broadly above so that the detailed description below may be better understood. Additional features and advantages will be described below. The concepts and specific examples disclosed may be readily utilized as a basis for modifying or designing other structures for achieving the same purposes 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 following description when considered in conjunction with the accompanying drawings. Each of the figures in the drawings is provided for the purpose of illustration and description and not as a definition of limitations of the claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order that the above-mentioned features of the present disclosure may be fully understood, a more particular description of the invention briefly summarized above may be obtained by reference to various aspects (some of which are illustrated in the accompanying drawings). It should be noted, however, that the drawings illustrate only certain typical aspects of the present disclosure and are not therefore to be considered limiting of its scope, as the description may admit to other equally effective aspects. The same reference numerals in different drawings may identify the same or similar elements.

[0013] Figure 1 is a diagram illustrating an example of a wireless network according to the present disclosure.

[0014] Figure 2 is a diagram illustrating an example of communication between a network node and a user equipment (UE) in a wireless network according to the present disclosure.

[0015] Figure 3 is a diagram illustrating an example of side link communication according to the present disclosure.

[0016] Figure 4 is a diagram illustrating an example of side link communication and access link communication according to the present disclosure.

[0017] Figure 5 is a diagram illustrating an example of resources associated with a physical sidelink feedback channel (PSFCH) according to the present disclosure.

[0018] Figure 6 is a diagram illustrating an example of channel occupancy time (COT) sharing for sidelink unlicensed (SL-U) according to the present disclosure.

[0019] Figure 7 is a diagram illustrating an example of multiple PSFCH transmission using a shared COT in SL-U according to the present disclosure.

[0020] Figure 8is a diagram illustrating an example associated with selecting multiple PSFCH transmissions to be transmitted in a PSFCH transmission opportunity when a shared COT in SL-U is used according to the present disclosure.

[0021] Figures 9A to 9B is a diagram illustrating an example associated with selecting PSFCH transmission to be transmitted in a PSFCH transmission opportunity when a shared COT in SL-U is used according to the present disclosure.

[0022] Figure 10 is a diagram illustrating an example process associated with priority handling of simultaneous PSFCHs in SL-U according to the present disclosure.

[0023] Figure 11 is a diagram of an example apparatus for wireless communications according to the present disclosure. DETAILED DESCRIPTION

[0024] Various aspects of the present disclosure are described more fully below with reference to the accompanying drawings. However, the present disclosure can be embodied in many different forms and should not be interpreted as being limited to any specific structure or function presented throughout the present disclosure. Instead, these aspects are provided so that the present disclosure will be thorough and complete, and the scope of protection of the present disclosure will be fully conveyed to those skilled in the art. Those skilled in the art will appreciate that the scope of the present disclosure is intended to cover any aspect of the present disclosure disclosed herein, whether it is implemented independently or in combination with any other aspect of the present disclosure. For example, any number of aspects set forth herein can be used to implement a device or practice method. In addition, the scope of the present disclosure is intended to cover such devices or methods that are practiced using other structures, functionality, or structure and functionality in addition to or different from the various aspects of the disclosure set forth herein. It should be understood that any aspect of the disclosure disclosed herein can be embodied by one or more elements of the present claims.

[0025] 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 and illustrated in the accompanying drawings by various blocks, modules, components, circuits, steps, processes, or algorithms (collectively, "elements"). These elements can be implemented using hardware, software, or a combination thereof. Whether these elements are implemented as hardware or software depends on the specific application and the design constraints imposed on the overall system.

[0026] Although various aspects may be described herein using terminology generally associated with 5G or New Radio (NR) radio access technology (RAT), various aspects of the present disclosure may be applicable to other RATs, such as 3G RAT, 4G RAT, and / or post-5G (e.g., 6G) RATs.

[0027] Figure 1 1 is a diagram illustrating an example of a wireless network 100. Wireless network 100 may be a 5G (e.g., NR) network or a 4G (e.g., Long Term Evolution (LTE)) network, or may include elements of a 5G (e.g., NR) network or elements of a 4G (e.g., Long Term Evolution (LTE)) network, etc. Wireless network 100 may include one or more network nodes 110 (illustrated as network node 110a, network node 110b, network node 110c, and network node 110d), user equipment (UE) 120 or multiple UEs 120 (illustrated as UE 120a, UE 120b, UE 120c, UE 120d, and UE 120e), or other entities. Network node 110 is an example of a network node communicating with UE 120. As shown, network node 110 may include one or more network nodes. For example, the network node 110 may be a converged network node, meaning that the converged network node is configured to utilize a radio protocol stack that is physically or logically integrated within a single RAN node (e.g., within a single device or unit). As another example, the network node 110 may be a disaggregated network node (sometimes referred to as a disaggregated base station), meaning that the network node 110 is configured to utilize a protocol stack that is physically or logically distributed between two or more nodes (such as one or more central units (CUs), one or more distributed units (DUs), or one or more radio units (RUs)).

[0028] In some examples, the network node 110 is or includes a network node (such as an RU) that communicates with the UE 120 via a radio access link. In some examples, the network node 110 is or includes a network node (such as a DU) that communicates with other network nodes 110 via a fronthaul link or a midhaul link. In some examples, the network node 110 is or includes a network node (such as a CU) that communicates with other network nodes 110 via a midhaul link or communicates with the core network via a backhaul link. In some examples, the network node 110 (such as a converged network node 110 or a decomposed network node 110) may include multiple network nodes, such as one or more RUs, one or more CUs, and / or one or more DUs. For example, the network node 110 may include an NR base station, an LTE base station, a Node B, an eNB (e.g., in 4G), a gNB (e.g., in 5G), an access point, a transmit receive point (TRP), a DU, an RU, a CU, a mobility element of the network, a core network node, a network element, network equipment, a RAN node, or a combination thereof. In some examples, network nodes 110 may be interconnected to each other or to one or more other network nodes 110 in wireless network 100 using any suitable transport network via various types of fronthaul interfaces, midhaul interfaces, and / or backhaul interfaces, such as direct physical connections, air interfaces, or virtual networks.

[0029] In some examples, network node 110 may provide communication coverage for a particular geographic area. In the Third Generation Partnership Project (3GPP), the term "cell" may refer to the coverage area of ​​network node 110 or a network node subsystem serving that coverage area, depending on the context in which the term is used. Network node 110 may provide communication coverage for a macrocell, a picocell, a femtocell, or another type of cell. A macrocell may cover a relatively large geographic area (e.g., several kilometers in radius) and may allow unrestricted access by UEs 120 with service subscriptions. A picocell may cover a relatively small geographic area and may allow unrestricted access by UEs 120 with service subscriptions. A femtocell may cover a relatively small geographic area (e.g., a residence) and may allow restricted access by UEs 120 associated with the femtocell (e.g., UEs 120 in a closed subscriber group (CSG)). A network node 110 for a macrocell may be referred to as a macro network node. A network node 110 for a picocell may be referred to as a pico network node. The network node 110 for a femto cell may be referred to as a femto network node or a home network node. Figure 1In the example shown, network node 110a may be a macro network node for macro cell 102a, network node 110b may be a pico network node for pico cell 102b, and network node 110c may be a femto network node for femto cell 102c. A network node may support one or more (e.g., three) cells. In some examples, the cells may not necessarily be stationary, and the geographic area of ​​the cells may move depending on the location of a mobile network node 110 (e.g., a mobile network node).

[0030] In some aspects, the term "base station" or "network node" may refer to a converged base station, a decomposed base station, an integrated access and backhaul (IAB) node, a relay node, or one or more components thereof. For example, in some aspects, a "base station" or "network node" may refer to a CU, a DU, a RU, a near real-time (near-RT) RAN intelligent controller (RIC), or a non-real-time (non-RT) RIC, or a combination thereof. In some aspects, the term "base station" or "network node" may refer to a device configured to perform one or more functions, such as those described herein in conjunction with network node 110. In some aspects, the term "base station" or "network node" may refer to multiple devices configured to perform one or more functions. For example, in some distributed systems, each of multiple different devices (which may be located in the same geographic location or in different geographic locations) may be configured to perform at least a portion of a function, or to repeatedly perform at least a portion of the function, and the term "base station" or "network node" may refer to any one or more of these different devices. In some aspects, the term "base station" or "network node" may refer to one or more virtual base stations or one or more virtual base station functions. For example, in some aspects, two or more base station functions may be instantiated on a single device. In some aspects, the term "base station" or "network node" may refer to one of the base station functions but not another base station function. In this way, a single device may include more than one base station.

[0031] The wireless network 100 may include one or more relay stations. A relay station is a network node that receives transmissions of data from an upstream node (e.g., a network node 110 or a UE 120) and transmits the transmissions of data to a downstream node (e.g., a UE 120 or a network node 110). A relay station may be a UE 120 that can relay transmissions for other UEs 120. Figure 1 In the example shown, a network node 110d (e.g., a relay network node) may communicate with a network node 110a (e.g., a macro network node) and a UE 120d to facilitate communications between the network node 110a and the UE 120d. A network node 110 that relays communications may be referred to as a relay station, a relay base station, a relay network node, a relay node, a relay, or a relay, among others.

[0032] The wireless network 100 may be a heterogeneous network that includes different types of network nodes 110, such as macro network nodes, pico network nodes, femto network nodes, or relay network nodes. These different types of network nodes 110 may have different transmit power levels, different coverage areas, or different impacts on interference in the wireless network 100. For example, a macro network node may have a high transmit power level (e.g., 5 watts to 40 watts), while a pico network node, a femto network node, and a relay network node may have a lower transmit power level (e.g., 0.1 watt to 2 watts).

[0033] The network controller 130 may be coupled to or in communication with a set of network nodes 110 and may provide coordination and control for these network nodes 110. The network controller 130 may communicate with the network nodes 110 via a backhaul communication link or a midhaul communication link. The network nodes 110 may also communicate directly with each other or indirectly via a wireless backhaul communication link or a wired backhaul communication link. In some aspects, the network controller 130 may be or may include a CU or a core network device.

[0034] UEs 120 may be dispersed throughout wireless network 100, and each UE 120 may be stationary or mobile. UE 120 may include, for example, an access terminal, a terminal, a mobile station, or a subscriber unit. UE 120 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, a biometric device, a wearable device (e.g., a smart watch, smart clothing, smart glasses, a smart wristband, smart jewelry (e.g., a smart ring or smart bracelet)), an entertainment device (e.g., a music device, a video device, or a satellite radio), an in-vehicle component or sensor, a smart meter / sensor, industrial manufacturing equipment, a global positioning system device, a UE function of a network node, or any other suitable device configured to communicate via a wireless or wired medium.

[0035] Some UEs 120 may be considered machine type communication (MTC) or evolved or enhanced machine type communication (eMTC) UEs. MTC UEs or eMTC UEs may include, for example, robots, drones, remote devices, sensors, meters, monitors, or location tags that can communicate with a network node, another device (e.g., a remote device), or some other entity. Some UEs 120 may be considered Internet of Things (IoT) devices or may be implemented as NB-IoT (narrowband IoT) devices. Some UEs 120 may be considered customer premises equipment. The UE 120 may be included inside a housing that houses components of the UE 120, such as a processor component or a memory component. In some examples, the processor component and the memory component may be coupled together. For example, the processor component (e.g., one or more processors) and the memory component (e.g., memory) may be operatively coupled, communicatively coupled, electronically coupled, or electrically coupled.

[0036] Generally speaking, any number of wireless networks 100 may be deployed in a given geographic area. Each wireless network 100 may support a specific RAT and may operate on one or more frequencies. A RAT may also be referred to as a radio technology or air interface. A frequency may also be referred to as a carrier or frequency channel. Each frequency in a given geographic area may support a single RAT to avoid interference between wireless networks of different RATs. In some cases, NR or 5G RAT networks may be deployed.

[0037] In some examples, 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 network node 110 as an intermediary to communicate with each other). For example, UE 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, or vehicle-to-pedestrian (V2P) protocols), or a mesh network. In such examples, UE 120 can perform scheduling operations, resource selection operations, or other operations described elsewhere herein as being performed by network node 110.

[0038] Devices of the wireless network 100 may communicate using an electromagnetic spectrum, which may be subdivided into various categories, bands, or channels by frequency or wavelength. For example, devices of the wireless network 100 may communicate using one or more operating bands. In 5G NR, two initial operating bands have been identified as frequency range designations FR1 (410 MHz to 7.125 GHz) and FR2 (24.25 GHz to 52.6 GHz). Although a portion of FR1 is greater than 6 GHz, FR1 is often (interchangeably) referred to as the “sub-6 GHz” band in various documents and articles. A similar naming issue sometimes occurs with respect to FR2, which is often (interchangeably) referred to as the “millimeter wave” band in documents and articles, although it is different from the extremely high frequency (EHF) band (30 GHz to 300 GHz) identified as the “millimeter wave” band by the International Telecommunication Union (ITU).

[0039] Frequencies between FR1 and FR2 are generally referred to as mid-band frequencies. Recent 5G NR research has identified the operating bands for these mid-band frequencies as frequency range designation FR3 (7.125 GHz to 24.25 GHz). The frequency bands falling within FR3 can inherit FR1 characteristics or FR2 characteristics, and thus the features of FR1 or FR2 can be effectively extended to mid-band frequencies. In addition, higher frequency bands are currently being explored to extend 5G NR operation to more than 52.6 GHz. For example, three higher operating bands have been identified as frequency range designations FR4a or FR4-1 (52.6 GHz to 71 GHz), FR4 (52.6 GHz to 114.25 GHz), and FR5 (114.25 GHz to 300 GHz). Each of these higher frequency bands falls within the EHF band.

[0040] With these examples in mind, unless otherwise specified, if the term "sub-6 GHz" is used herein, it may broadly refer to frequencies that may be less than 6 GHz, frequencies that may be within FR1, or frequencies that may include mid-band frequencies. Furthermore, unless otherwise specified, if the term "millimeter wave" is used herein, it may broadly refer to frequencies that may include mid-band frequencies, frequencies that may be within FR2, FR4, FR4-a, FR4-1, or FR5, or frequencies that may be within the EHF band. It is contemplated that the frequencies included in these operating bands (e.g., FR1, FR2, FR3, FR4, FR4-a, FR4-1, or FR5) may be modified, and that the techniques described herein are applicable to those modified frequency ranges.

[0041] In some aspects, UE 120 may include a communications manager 140. As described in greater detail elsewhere herein, communications manager 140 may receive a plurality of physical sidelink shared channel (PSSCH) transmissions associated with a physical sidelink feedback channel (PSFCH) transmission opportunity on an unlicensed sidelink channel, wherein at least one of the PSFCH transmission opportunities is within a shared channel occupancy time (COT); determine a minimum number of PSFCH transmissions to be transmitted in the PSFCH transmission opportunity; select a set of PSFCH transmissions among the scheduled PSFCH transmissions that includes at least the minimum number of PSFCH transmissions based at least in part on whether the plurality of scheduled PSFCH transmissions associated with the PSFCH transmission opportunity are within the shared COT; and transmit the selected set of PSFCH transmissions on the unlicensed sidelink channel in the PSFCH transmission opportunity. Additionally or alternatively, communications manager 140 may perform one or more other operations described herein.

[0042] As indicated above, Figure 1 are provided as examples. Other examples can be found in the Figure 1 The examples described are different.

[0043] Figure 2 2 is a diagram illustrating example 200 of a network node 110 communicating with a UE 120 in a wireless network 100. The network node 110 may be equipped with a set of antennas 234a through 234t, such as T antennas (T ≥ 1). The UE 120 may be equipped with a set of antennas 252a through 252r, such as R antennas (R ≥ 1). The network node 110 of example 200 includes one or more radio frequency components, such as antennas 234 and a modem 232. In some examples, the network node 110 may include an interface, a communication component, or another component that facilitates communication with the UE 120 or another network node. Some network nodes 110 may not include radio frequency components, such as one or more CUs or one or more DUs, that facilitate direct communication with the UE 120.

[0044] At network node 110, transmit processor 220 may receive data intended for UE 120 (or a set of UEs 120) from data source 212. Transmit processor 220 may use one or more channel quality indicators (CQIs) received from UE 120 to select one or more modulation and coding schemes (MCSs) for UE 120. Network node 110 may process (e.g., encode and modulate) the data for UE 120 using the MCS selected for UE 120 and may provide data symbols to UE 120. Transmit processor 220 may process system information (e.g., for semi-static resource partitioning information (SRPI)) and control information (e.g., CQI requests, grants, or upper layer signaling) and provide overhead symbols and control symbols. Transmit processor 220 may generate reference symbols for reference signals (e.g., cell-specific reference signals (CRS) or demodulation reference signals (DMRS)) and synchronization signals (e.g., primary synchronization signals (PSS) or secondary synchronization signals (SSS)). The transmit (TX) multiple-input, multiple-output (MIMO) processor 230 may perform spatial processing (e.g., precoding) on ​​data symbols, control symbols, overhead symbols, or reference symbols, as applicable, and may provide a set of output symbol streams (e.g., T output symbol streams) to a corresponding set of modems 232 (e.g., T modems) (shown as modems 232a through 232t). For example, each output symbol stream may be provided to a modulator component (shown as MOD) of the modem 232. Each modem 232 may process a corresponding output symbol stream (e.g., for OFDM) using a corresponding modulator component to obtain an output sample stream. Each modem 232 may also process (e.g., convert to analog, amplify, filter, or upconvert) the output sample stream using a corresponding modulator component to obtain a downlink signal. The modems 232a through 232t may transmit a set of downlink signals (e.g., T downlink signals) via a corresponding set of antennas 234 (e.g., T antennas) (shown as antennas 234a through 234t).

[0045] At the UE 120, a set of antennas 252 (shown as antennas 252a through 252r) may receive downlink signals from the network node 110 or other network nodes 110 and may provide a set of received signals (e.g., R received signals) to a set of modems 254 (e.g., R modems) (shown as modems 254a through 254r). For example, each received signal may be provided to a demodulator component (shown as DEMOD) of the modem 254. Each modem 254 may use a corresponding demodulator component to condition (e.g., filter, amplify, downconvert, or digitize) the received signal to obtain input samples. Each modem 254 may use the demodulator component to further process the input samples (e.g., for OFDM) to obtain received symbols. A MIMO detector 256 may obtain received symbols from the modem 254, may perform MIMO detection on the received symbols if applicable, and may provide detected symbols. The receive processor 258 may process (e.g., demodulate and decode) the detected symbols, may provide decoded data for the UE 120 to a data sink 260, and may 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 a reference signal received power (RSRP) parameter, a received signal strength indicator (RSSI) parameter, a reference signal received quality (RSRQ) parameter, or a CQI parameter, among other parameters. In some examples, one or more components of the UE 120 may be included in a housing 284.

[0046] 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 network node 110 via the communication unit 294.

[0047] One or more antennas (e.g., antennas 234a to 234t or antennas 252a to 252r) may include or may be included in one or more antenna panels, one or more antenna groups, one or more sets of antenna elements, or one or more antenna arrays, etc. An antenna panel, antenna group, set of antenna elements, or antenna array may include one or more antenna elements (in a single housing or multiple housings), a set of coplanar antenna elements, a set of non-coplanar antenna elements, or a plurality of antenna elements coupled to one or more transmit or receive components (such as antennas 234a to 234t, antennas 252a to 252r). Figure 2 One or more antenna elements of one or more components).

[0048] On the uplink, at the UE 120, a transmit processor 264 may receive and process data from a data source 262 and control information (e.g., for reports including RSRP, RSSI, RSRQ, or CQI) from a controller / processor 280. The transmit processor 264 may generate reference symbols for one or more reference signals. The symbols from the transmit processor 264 may be pre-decoded by a TX MIMO processor 266, where applicable, further processed by a modem 254 (e.g., for DFT-s-OFDM or CP-OFDM), and transmitted to the network node 110. In some examples, the modem 254 of the UE 120 may include a modulator and a demodulator. In some examples, the UE 120 includes a transceiver. The transceiver may include any combination of an antenna 252, a modem 254, a MIMO detector 256, a receive processor 258, a transmit processor 264, or a TX MIMO processor 266. The transceiver may be used by a processor (e.g., the controller / processor 280) and a memory 282 to perform operations described herein (e.g., with reference to FIG. 2 ). Figure 8 、 Figures 9A to 9B 、 Figure 10 and / or Figure 11 ) any aspects of any process described in the process.

[0049] At the network node 110, uplink signals from the UE 120 or other UEs may be received by an antenna 234, processed by a modem 232 (e.g., a demodulator component of the modem 232, shown as DEMOD), detected by a MIMO detector 236, if applicable, and further processed by a receive processor 238 to obtain decoded data and control information transmitted via the UE 120. The receive processor 238 may provide the decoded data to a data sink 239 and the decoded control information to a controller / processor 240. The network node 110 may include a communication unit 244 and may communicate with the network controller 130 via the communication unit 244. The network node 110 may include a scheduler 246 to schedule one or more UEs 120 for downlink or uplink communication. In some examples, the modem 232 of the network node 110 may include a modulator and a demodulator. In some examples, the network node 110 includes a transceiver. The transceiver may include any combination of antenna 234, modem 232, MIMO detector 236, receive processor 238, transmit processor 220, or TX MIMO processor 230. The transceiver may be used by a processor (e.g., controller / processor 240) and memory 242 to execute the instructions herein (e.g., reference 242). Figure 8 、 Figures 9A to 9B 、 Figure 10 and / or Figure 11 ) any aspects of any process described in the process.

[0050] In some aspects, the controller / processor 280 may be a component of a processing system. A processing system may generally be a system or series of machines or components that receives input and processes the input to produce a set of outputs, which may be communicated to other systems or components, such as the UE 120. For example, the processing system of the UE 120 may be a system that includes various other components or subcomponents of the UE 120.

[0051] The processing system of UE 120 may interface with one or more other components of UE 120, may process information (such as input or signals) received from one or more other components, or may output information to one or more other components. For example, a chip or modem of UE 120 may include: a processing system, a first interface for receiving or obtaining information, and a second interface for outputting, sending, or providing information. In some examples, the first interface may be an interface between the processing system of the chip or modem and a receiver, allowing UE 120 to receive information or signal input and pass the information to the processing system. In some examples, the second interface may be an interface between the processing system of the chip or modem and a transmitter, allowing UE 120 to transmit information output from the chip or modem. One of ordinary skill in the art will readily recognize that the second interface may also obtain or receive information or signal input, and the first interface may also output, send, or provide information.

[0052] In some aspects, controller / processor 240 may be a component of a processing system. A processing system may generally be a system or series of machines or components that receives input and processes the input to produce a set of outputs that may be passed to other systems or components, such as network node 110. For example, the processing system of network node 110 may be a system that includes various other components or subcomponents of network node 110.

[0053] The processing system of network node 110 may interface with one or more other components of network node 110, process information (such as input or signals) received from one or more other components, or output information to one or more other components. For example, a chip or modem of network node 110 may include a processing system, a first interface for receiving or obtaining information, and a second interface for outputting, sending, or providing information. In some examples, the first interface may be an interface between the processing system of the chip or modem and a receiver, allowing network node 110 to receive information or signal input and pass information to the processing system. In some examples, the second interface may be an interface between the processing system of the chip or modem and a transmitter, allowing network node 110 to transmit information output from the chip or modem. Those skilled in the art will readily appreciate that the second interface may also obtain or receive information or signal input, and the first interface may also output, send, or provide information.

[0054] The controller / processor 240 of the network node 110, the controller / processor 280 of the UE 120, or Figure 2 Any other component of the controller / processor 240 of the network node 110, the controller / processor 280 of the UE 120, or the like may perform one or more techniques associated with priority handling of simultaneous PSFCHs in the sidelink ungranted (SL-U) as described in more detail elsewhere herein. For example, the controller / processor 240 of the network node 110, the controller / processor 280 of the UE 120, or the like Figure 2 Any other component (or combination of components) may perform or direct e.g. Figure 10 10 and / or other processes as described herein. Memory 242 and memory 282 may store data and program codes for network node 110 and UE 120, respectively. In some examples, memory 242 and memory 282 may include non-transitory computer-readable media storing one or more instructions (e.g., code or program code) for wireless communication. For example, the one or more instructions, when executed (e.g., directly or after compilation, conversion, or interpretation) by one or more processors of network node 110 or UE 120, may cause the one or more processors, UE 120, or network node 110 to perform or direct, for example, Figure 10 The operations of process 1000 and / or other processes as described herein. In some examples, executing instructions may include running instructions, converting instructions, compiling instructions, and / or interpreting instructions, among others.

[0055] In some aspects, the responding UE 120 includes: means for receiving a plurality of PSFCH transmissions associated with a PSFCH transmission opportunity on an unlicensed sidelink channel, wherein at least one of the PSFCH transmission opportunities is in a shared COT; means for determining a minimum number of PSFCH transmissions to be sent in the PSFCH transmission opportunity; means for selecting a set of PSFCH transmissions including at least the minimum number of PSFCH transmissions among the scheduled PSFCH transmissions based at least in part on whether the plurality of scheduled PSFCH transmissions associated with the PSFCH transmission opportunity are in the shared COT; and / or means for transmitting the selected set of PSFCH transmissions on the unlicensed sidelink channel in the PSFCH transmission opportunity. The means of the responding UE 120 performing the operations described herein may include, for example, one or more of the communications manager 140, the antenna 252, the modem 254, the MIMO detector 256, the receive processor 258, the transmit processor 264, the TX MIMO processor 266, the controller / processor 280, or the memory 282.

[0056] Although Figure 2 The blocks in FIG. 2 are illustrated 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.

[0057] As indicated above, Figure 2 are provided as examples. Other examples can be found in the Figure 2 The examples described are different.

[0058] The deployment of a communication system such as a 5G NR system can be arranged in a variety of ways with various components or constituent parts. In a 5G NR system or network, a network node, a network entity, a mobility element of the network, a RAN node, a core network node, a network element, a base station or network equipment may be implemented in an aggregated architecture or a decomposed architecture. For example, a base station (such as a node B (NB), an evolved NB (eNB), an NR base station, a 5G NB, an access point (AP), a TRP or a cell, etc.) or one or more units (or one or more components) performing base station functionality may be implemented as an aggregated base station (also referred to as an independent base station or a monolithic base station) or a decomposed base station. A “network entity” or a “network node” may refer to a decomposed base station or one or more units of a decomposed base station (such as one or more CUs, one or more DUs, one or more RUs or a combination thereof).

[0059] A converged base station (e.g., a converged network node) may be configured to utilize a radio protocol stack that is physically or logically integrated within a single RAN node (e.g., within a single device or unit). A decomposed base station (e.g., a decomposed network node) may be configured to utilize a protocol stack that is physically or logically distributed between two or more units (such as one or more CUs, one or more DUs, or one or more RUs). In some examples, the CU may be implemented within a network node, and one or more DUs may be co-located with the CU, or alternatively, may be geographically or virtually spread across one or more other network nodes. The DU may be implemented to communicate with one or more RUs. Each of the CU, DU, and RU may also be implemented as a virtual unit, such as a virtual central unit (VCU), a virtual distributed unit (VDU), or a virtual radio unit (VRU), among others.

[0060] Base station type operation or network design may take into account the aggregated nature of base station functionality. For example, a disaggregated base station may be utilized in an IAB network, an open radio access network (O-RAN (such as a network configuration initiated by the O-RAN Alliance)), or a virtualized radio access network (vRAN, also known as a cloud radio access network (C-RAN)) to facilitate scaling of the communication system by separating base station functionality into one or more units that can be deployed separately. A disaggregated base station may include functionality implemented across two or more units at various physical locations, as well as functionality implemented virtually for at least one unit, which may enable flexibility in network design. Various units of the disaggregated base station may be configured for wired or wireless communication with at least one other unit of the disaggregated base station.

[0061] Figure 3 is a diagram illustrating an example 300 of sidelink communications according to the present disclosure.

[0062] like Figure 3As 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, and / or V2P communication), and / or mesh networking. 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 transmit time intervals (TTIs) (e.g., frames, subframes, time slots, or symbols).

[0063] As in Figure 3 As further shown in FIG, one or more sidelink channels 310 may include a physical sidelink control channel (PSCCH) 315, a PSSCH 320, and / or a PSFCH 325. PSCCH 315 may be used to convey control information, similar to a physical downlink control channel (PDCCH) and / or a physical uplink control channel (PUCCH) used for cellular communication with network node 110 via an access link or access channel. PSSCH 320 may be used to convey data, similar to a physical downlink shared channel (PDSCH) and / or a physical uplink shared channel (PUSCH) used for cellular communication with network node 110 via an access link or access channel. For example, PSCCH 315 may carry sidelink control information (SCI) 330, which may indicate various control information for sidelink communication, such as one or more resources (e.g., time resources, frequency resources, and / or space resources), wherein transport blocks (TBs) 335 may be carried on PSSCH 320. TBs 335 may include data. The PSFCH 325 may be used to communicate sidelink feedback 340, such as hybrid automatic repeat request (HARQ) feedback (eg, acknowledgement or negative acknowledgement (ACK / NACK) information), transmit power control (TPC), and / or scheduling requests (SR).

[0064] Although shown on the PSCCH 315, in some aspects, the SCI 330 may include multiple communications in different levels, such as a first-level SCI (SCI-1) and a second-level SCI (SCI-2). SCI-1 may be transmitted on the PSCCH 315. SCI-2 may be transmitted on the PSSCH 320. SCI-1 may include, for example, an indication of one or more resources (e.g., time resources, frequency resources, and / or space resources) on the PSSCH 320, information for decoding sidelink communications on the PSSCH, a quality of service (QoS) priority value, a resource reservation period, a PSSCH DMRS pattern, an SCI format for SCI-2, a beta offset for SCI-2, the number of PSSCH DMRS ports, and / or an MCS. SCI-2 may include information associated with data transmission on the PSSCH 320, such as a HARQ process ID, a new data indicator (NDI), a source identifier, a destination identifier, and / or a channel state information (CSI) report trigger.

[0065] 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 transmitted in a subchannel using specific resource blocks (RBs) across time. In some aspects, a data transmission associated with a scheduling assignment (e.g., on PSSCH 320) may occupy adjacent RBs in the same subframe as the scheduling assignment (e.g., using frequency division multiplexing). In some aspects, the scheduling assignment and the associated data transmission are not transmitted on adjacent RBs.

[0066] In some aspects, the UE 305 may operate using a sidelink transmission mode (e.g., Mode 1) in which resource selection and / or scheduling is performed by the network node 110 (e.g., a base station, CU, or DU). For example, the UE 305 may receive a grant for sidelink channel access and / or scheduling from the network node 110 (e.g., directly or via one or more network nodes) (e.g., in downlink control information (DCI) or in a radio resource control (RRC) message, such as a grant for configuration). In some aspects, the UE 305 may operate using a transmission mode (e.g., Mode 2) in which resource selection and / or scheduling is performed by the UE 305 (e.g., rather than the network node 110). In some aspects, the UE 305 may perform resource selection and / or scheduling by sensing channel availability for transmission. For example, UE 305 may measure RSSI parameters associated with various sidelink channels (e.g., sidelink-RSSI (S-RSSI) parameters), may measure RSRP parameters associated with various sidelink channels (e.g., PSSCH-RSRP parameters), and / or may measure RSRQ parameters associated with various sidelink channels (e.g., PSSCH-RSRQ parameters), and may select a channel for sending sidelink communications based at least in part on the measurements.

[0067] 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 and / or channel parameters. Additionally or alternatively, the UE 305 may perform resource selection and / or scheduling by determining a channel busy rate (CBR) associated with each sidelink channel, which may be used for rate control (e.g., by indicating a maximum number of RBs that the UE 305 may use for a particular set of subframes).

[0068] 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 transmit the grant in the SCI 330. The sidelink grant may indicate, for example, one or more parameters (e.g., transmission parameters) to be used for an upcoming sidelink transmission, such as one or more resource blocks (e.g., for TB 335) to be used for the upcoming sidelink transmission on the PSSCH 320, one or more subframes to be used for the upcoming sidelink transmission, and / or an MCS to be used for the upcoming sidelink transmission. In some aspects, the UE 305 may generate a sidelink grant that indicates one or more parameters for semi-persistent scheduling (SPS), such as the periodicity of the sidelink transmission. Additionally or alternatively, the UE 305 may generate a sidelink grant for event-driven scheduling, such as for on-demand sidelink messages.

[0069] As indicated above, Figure 3 are provided as examples. Other examples can be found in the Figure 3 The examples described are different.

[0070] Figure 4 is a diagram illustrating an example 400 of sidelink and access link communications according to the present disclosure.

[0071] 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 network node 110 may communicate (e.g., directly or via one or more network nodes) with the Tx / Rx UE 405, such as via a first access link. Additionally or alternatively, in some sidelink modes, the network node 110 may communicate (e.g., directly or via one or more network nodes) with the Rx / Tx UE 410, such as via a first access link. The Tx / Rx UE 405 and / or the Rx / Tx UE 410 may correspond to one or more UEs described elsewhere herein, such as Figure 1 UE 120. Thus, a direct link between UEs 120 (e.g., via a PC5 interface) may be referred to as a side link, and a direct link between network 110 and UE 120 (e.g., via a Uu interface) may be referred to as an access link. Sidelink communications may be sent via the side link, and access link communications may be sent via the access link. Access link communications may be downlink communications (from network node 110 to UE 120) or uplink communications (from UE 120 to network node 110).

[0072] As indicated above, Figure 4 are provided as examples. Other examples can be found in the Figure 4 The examples described are different.

[0073] Figure 5 is a diagram illustrating an example 500 of resources associated with a PSFCH 510 according to the present disclosure. As described herein, the resources shown in example 500 may be associated with sidelink communications, such as in conjunction with Figure 3 and Figure 4 For example, the resources shown in example 500 and described herein may be associated with sidelink communications between and / or among multiple UEs (e.g., UE 120, UE 305-1, UE 305-2, Tx / Rx UE 405, and / or Rx / Tx UE 410, etc.). Additionally or alternatively, Figure 5 The PSFCH 510 shown in FIG. 1 and described herein may correspond to a PSFCH 510 in conjunction with Figure 3PSFCH 325 described.

[0074] In some aspects, the PSFCH 510 may be associated with (e.g., used to carry or otherwise provide HARQ feedback associated with) the PSSCH 520, which may correspond to a PSSCH in conjunction with Figure 3 For example, in some aspects, the HARQ feedback may include an ACK indicating that the responding UE successfully received and decoded a PSSCH message sent on the PSSCH 520, or a NACK indicating that the responding UE failed to receive or failed to decode the PSSCH message sent on the PSSCH 520. Additionally or alternatively, the PSFCH 510 may be used to carry collision information associated with a PSSCH message sent on the PSSCH 520 (e.g., indicating resource conflicts for resources reserved for upcoming transmissions on the PSSCH 520 and / or resource conflicts for transmissions already made on the PSSCH 520).

[0075] The PSSCH 520 may be associated with a set of PSSCH opportunities 530, which may exist across a resource grid associated with time slots n and n+1 and subchannels m, m+1, m+2, and m+3. Each PSSCH opportunity 530 may correspond to a different PSFCH resource 540 associated with the PSFCH 510. For example, for a PSSCH communication received in time slot n and subchannel m, the responding UE may send HARQ feedback information 550 on multiple physical resource blocks (PRBs) within the corresponding PSFCH resource 540, as shown by the arrow connecting the PSSCH opportunity 530 associated with time slot n and subchannel m to the PSFCH resource 540 including the HARQ feedback information 550. Similarly, each of the other PSSCH opportunities 530 may be associated with a corresponding PSFCH resource 540. In some cases, for each PSFCH resource 540, the responding UE may use multiple length-12 sequence repetitions across multiple PRBs and / or may use different cyclic shift (CS) pairs (e.g., CS pair 0 and CS pair 1) to distinguish ACK or NACK for each sequence.

[0076] In some instances, the resources associated with the PSFCH 510 may be associated with a resource pool that is not a dedicated PSFCH resource pool as in example 500. Instead, in example 500, the resource pool associated with the PSFCH 510 includes resources for multiple sidelink communication types (e.g., different sidelink channels), such as PSSCH communication and / or PSCCH communication in addition to PSFCH communication. In such cases, the responding UE providing the HARQ feedback information 550 may be configured with one or more parameters to determine the PSFCH 510 and / or the specific PSFCH resources 540 used to transmit the HARQ feedback information 550. For example, the responding UE may receive an indication of a PSFCH period parameter (e.g., a periodPSFCHresource parameter), which may indicate a period (in number of time slots) for PSFCH transmissions within the resource pool. In some cases, the PSFCH period parameter may have a value equal to zero (0), which may indicate that no PSFCH is present, or the PSFCH period parameter may have a value of one slot, two slots, or four slots. For a given PSSCH 520, the responding UE may then send HARQ feedback information 550 (e.g., ACK / NACK information) in the first slot associated with the PSFCH resource 540 after the PSSCH 520 and after a minimum time gap, which may be indicated by a PSFCH minimum time gap parameter (e.g., a minTimeGapPSFCH parameter).

[0077] Additionally or alternatively, the UE may receive an indication of a set of PRBs for PSFCH transmission and reception within a time slot (e.g., denoted as and / or indicated in the sl-PSFCH-RB-Set parameter). Thus, each PSSCH opportunity 530 may be associated with multiple PRBs, which may be More specifically, the PSSCH 520 may be associated with multiple slots associated with one PSFCH 510 slot (e.g., represented as In example 500, the number of time slots is equal to two (2), corresponding to time slot n and time slot n+1), and / or the PSSCH 520 may be associated with multiple subchannels within each time slot (e.g., represented as In example 500, the number of subchannels is equal to four (4), corresponding to subchannels m, m+1, m+2, and m+3. In such cases, each subchannel and / or time slot of the PSSCH 520 resource grid (e.g., each PSSCH opportunity 530) may be associated with a plurality of PSFCH PRBs for PSFCH transmission and reception (e.g., represented as ), the number of PSFCH PRBs can be equal to The mapping between each subchannel and / or time slot (e.g., each PSSCH opportunity 530) of the PSSCH 520 resource grid and the corresponding PSFCH resource 540 can be performed in a time-first manner, as in Figure 5 For example, the first PSSCH opportunity 530 in time (e.g., PSSCH opportunity 530 in time slot n) in the first subchannel (e.g., subchannel m) may be mapped to the first PSFCH resource 540, the second PSSCH opportunity 530 in time in the first subchannel may be mapped to the second PSFCH resource 540, the first PSSCH opportunity 530 in time in the second subchannel may be mapped to the third PSFCH resource 540, and so on.

[0078] In some cases, the size of the PSFCH resource pool (e.g., ) can be equal to In such cases, The PSFCH resource pool may be based at least in part on whether the PSFCH resource pool is associated with multiple subchannels in a PSSCH slot. For example, if the PSFCH resource pool is associated with only one PSSCH subchannel, then may be equal to one (1), or may otherwise be equal to the number of subchannels within each PSSCH slot (e.g., ). In addition, The number of cyclic shift pairs associated with a PSFCH resource pool may correspond to the number of cyclic shift pairs associated with a PSFCH resource pool, which may be configured per resource pool, and the item may correspond to the number of PSFCH PRBs associated with each subchannel and / or time slot (e.g., each PSSCH opportunity 530) of the PSSCH 520 resource grid, as described above. Additionally or alternatively, the responding UE may calculate the number of PSFCH PRBs according to the formula To determine the PSFCH resources, Corresponding to the size of the PSFCH resource pool (as described above), P ID corresponds to a physical source identifier indicated by an SCI message (eg, SCI-2A or SCI-2B) associated with the PSSCH 520, and M ID is zero (0) or corresponds to the identity of the responding UE receiving the PSSCH 520. In other words, for unicast transmission, M ID may be equal to zero (0), and the responding UE may select a value that depends only on the source identifier (e.g., P ID ) provides feedback in the PSFCH resource pool, while for multicast transmission, each receiving UE can select a separate resource in the resource pool to send feedback, which depends on the P ID and M ID .Both.

[0079] As indicated above, Figure 5 are provided as examples. Other examples can be found in the Figure 5 The examples described are different.

[0080] Figure 6 is a diagram illustrating an example 600 of COT sharing of SL-U according to the present disclosure.

[0081] In order to accommodate the ever-increasing business demands, various efforts have been made to improve the spectrum efficiency in wireless networks and thereby increase network capacity (e.g., via the use of higher-order modulation, advanced MIMO antenna technology, and / or multi-cell coordination technology, etc.). Another way to potentially increase network capacity is to expand the system bandwidth. However, the available spectrum in the lower frequency bands that has traditionally been licensed or otherwise allocated to mobile network operators has become very scarce. Therefore, various technologies have been developed to enable the operation of cellular RATs in unlicensed or other shared spectrum. For example, License Assisted Access (LAA) uses carrier aggregation on the downlink to combine LTE in a licensed band with LTE in an unlicensed band (e.g., the 2.4 and / or 5 GHz bands that have been filled with wireless local area network (WLAN) or "Wi-Fi" devices). In other examples, enhanced LAA (eLAA) and further enhanced LAA (feLAA) technologies enable both uplink and downlink LTE operation in unlicensed spectrum, MulteFire is an LTE-based technology that operates in standalone mode in unlicensed and shared spectrum, NR-U enables NR operation in unlicensed spectrum, and SL-U enables sidelink operation in unlicensed spectrum. Generally speaking, when operating a cellular RAT (e.g., using LAA, eLAA, feLAA, MulteFire, NR-U, and / or SL-U) in unlicensed spectrum, one challenge that arises is the need to ensure fair coexistence with incumbent (e.g., WLAN) systems that may operate in the unlicensed spectrum.

[0082] For example, before obtaining access to an unlicensed channel and / or transmitting on an unlicensed channel, a transmitting device (e.g., network node 110, UE 120, etc.) having a packet to transmit may need to perform a listen-before-talk (LBT) process to contend for access to the unlicensed channel. The LBT process may generally include a clear channel assessment (CCA) process that is performed to determine whether the unlicensed channel is available (e.g., not occupied by other transmitters). Specifically, the CCA process may include detecting an energy level on the unlicensed channel and determining whether the energy level meets (e.g., is less than or equal to) a threshold (sometimes referred to as an energy detection threshold (EDT)). When the energy level meets (e.g., is not equal to or exceeds) the threshold, the CCA process is considered successful, and the transmitting device may obtain access to the unlicensed channel within a duration that may be referred to as a COT, during which the transmitting device may perform transmission without performing additional LBT operations. When the energy level does not meet the threshold, the CCA process is unsuccessful, and contention for access to the unlicensed channel may be considered unsuccessful.

[0083] When the CCA procedure results in a determination that the unlicensed channel band is unavailable (e.g., because the energy level detected on the unlicensed channel indicates that another device is already using the channel), the CCA procedure may be performed again at a later time. In environments where the transmitting device may lack access to the unlicensed channel (e.g., due to WLAN activity or transmissions by other devices), an extended CCA (eCCA) procedure may be employed to increase the likelihood that the transmitting device will successfully obtain access to the unlicensed channel. For example, a transmitting device performing an eCCA procedure may perform a random number of CCA procedures (from 1 to q) based on an eCCA counter. In the event that and / or when the transmitting device senses that the channel has become clear, the transmitting device may initiate a random waiting period based on the eCCA counter and begin transmitting if the channel remains clear within the random waiting period.

[0084] Thus, while wireless networks may be configured to use unlicensed spectrum to achieve faster data rates, provide a more responsive user experience, and / or offload traffic from licensed spectrum, the need to ensure fair coexistence with incumbent systems (e.g., WLAN devices) may hinder efficient use of the unlicensed spectrum. For example, even when there is no interference, the LBT process used to ensure that no other device is already using the channel introduces a delay before transmission can begin, which may degrade the user experience and / or result in unacceptable performance for latency-sensitive or delay-sensitive applications. Furthermore, these problems may be exacerbated when the initial CCA process is unsuccessful, as the transmitting device may only be able to transmit on the channel after performing an additional number of CCA processes and determining that the channel has become clear and remained clear for a random waiting period. Furthermore, in some cases, the COT obtained by the initiating transmitting device may have a duration that is longer than the duration necessary for the transmitting device to perform the desired transmission, which may result in inefficient use of the unlicensed channel.

[0085] Therefore, in some cases, the wireless network may share the COT initiated by the transmitting device with other nodes to improve access and / or efficiency for unlicensed channels. For example, in downlink-to-uplink COT sharing on the access link, the network node may use eCCA to obtain the COT, and the COT may be shared with one or more UEs (e.g., UE 120, UE 305, etc.), which may then transmit uplink signals within the COT initiated by the network node. In this case, a UE attempting to initiate an uplink transmission within the COT shared with the network node may perform the uplink transmission without having to perform an LBT procedure (e.g., a Category 1 LBT procedure, also referred to as no LBT), or the UE may perform the uplink transmission after performing a single CCA using a shorter LBT procedure (e.g., a Category 2 LBT procedure when the downlink-to-uplink gap duration is between 16 μs and 25 μs and / or a Category 1 LBT procedure when the downlink-to-uplink gap duration is less than or equal to 16 μs).

[0086] Additionally or alternatively, the wireless network may support uplink-to-downlink COT sharing from the UE to the network node on the access link. For example, the UE may perform a Category 4 LBT procedure to initiate a COT (e.g., for configuring a grant of a PUSCH or a scheduled uplink transmission), which may be shared with the network node via Group Common Uplink Control Information (GC-UCI), which indicates the starting point and duration of the remaining portion of the COT to be shared with the network node. For example, the UE may perform a Category 4 LBT procedure to initiate a COT with a duration of 4 milliseconds (ms) and may use only 1 ms of the COT so that the remaining 3 ms of the COT may be shared with another device. In this case, the network node may need to obtain the remaining portion of the COT immediately after the UE's last transmission in the earlier (used) portion of the COT by performing Category 1 or Category 2 LBT sensing using a 16 μs gap or a 25 μs gap before the base station's transmission. In this way, a network node may transmit control and / or broadcast signals and / or channels directed to any UE served by the network node, as long as the transmission includes downlink signals, channels and / or other transmissions (e.g., PDSCH, PDCCH, reference signals, etc.) intended to be received by the UE initiating the COT.

[0087] Additionally or alternatively, the wireless network may support UE-to-UE COT sharing on the sidelink. Figure 6 As shown by reference numeral 610 in FIG, the COT initiated by the transmitting UE (e.g., UE 305-1) can be shared with the responding UE (e.g., UE 305-2) in a frequency division multiplexing (FDM) mode by dividing the COT into multiple interlaces (e.g., time periods during which one or more UEs can perform transmission operations). Figure 6 As shown, the transmitting UE initiating the COT may use one or more sidelink resources (e.g., time and frequency resources) to transmit in the first interlace after the COT has been obtained, and the responding UE may use sidelink frequency resources that do not overlap with the sidelink frequency resources used by the initiating UE to perform transmission operations in subsequent interlaces. Figure 6As shown, FDM or interlace-based COT sharing can introduce short transmission gaps between interlaces to allow other UEs to perform transmission operations in subsequent interlaces during the shared COT, and the SCI sent by the COT initiating UE can carry information to support interlace-based COT sharing. For example, the SCI containing COT sharing information can be regarded as a COT sharing grant from the initiating UE that is sharing the COT, and all responding UEs that are eligible to share the COT (e.g., based on a distance metric, a group identifier, and / or other information) can use the SCI as a COT sharing grant. In this case, the responding UE can perform a Category 1 or Category 2 LBT procedure before transmitting at any time until the end of the COT, and the transmission gap restriction may not apply (e.g., a UE sharing the COT can start transmitting anywhere within the shared COT area, even if there is a gap greater than 25 μs between the transmission and the end of the last transmission of the COT initiating UE).

[0088] Additionally or alternatively, as shown in reference numeral 620, UE-to-UE COT sharing can be implemented in a time division multiplexing (TDM) mode. In this case, the total COT can be divided into an initial time period during which the initiating UE can perform transmissions (which may include one or more SCI transmissions, the one or more SCI transmissions including a COT sharing signal to indicate when the initial transmission will end) and the remaining duration of the COT available for sharing. Thus, one or more responding UEs can monitor the SCIs transmitted by other UEs (e.g., the initiating UE) to recover COT sharing information that can be used to perform transmissions during the time period corresponding to the shared COT. Thus, as described herein, UE-to-UE COT sharing can achieve better access to unlicensed spectrum and / or more efficient use of the unlicensed spectrum by enabling multiple UEs to perform transmissions during the COT obtained by the initiating UE (e.g., a UE that successfully performs a Category 4 LBT procedure to obtain access to an unlicensed channel).

[0089] As indicated above, Figure 6 are provided as examples. Other examples can be found in the Figure 6 The examples described are different.

[0090] Figure 7 is a diagram illustrating an example 700 of multiple PSFCH transmission using a shared COT in SL-U according to the present disclosure.

[0091] Generally speaking, when a responding UE receives one or more PSSCH transmissions from one or more transmitting UEs, the responding UE may send one or more PSFCH transmissions in a PSFCH transmission opportunity, the one or more PSFCH transmissions carrying HARQ feedback and / or collision information associated with the one or more PSSCH transmissions. For example, depending on the sidelink configuration, a PSFCH symbol may be associated with one or more PSSCH time slots, thereby allowing a PSFCH transmission associated with any PSSCH transmission received in one or more PSSCH time slots to be sent in the associated PSFCH transmission opportunity. Therefore, in the case where the responding UE receives multiple PSSCH transmissions in a time period associated with a PSFCH transmission opportunity, the responding UE may have multiple simultaneous PSFCH transmissions to be sent in the associated PSFCH transmission opportunity. However, the responding UE may be subject to a maximum transmit power limit for the PSFCH transmissions sent in the PSFCH transmission opportunity and / or may have the ability to support only a maximum number of simultaneous PSFCH transmissions. In such cases, the responding UE may apply one or more priority rules to select the PSFCH transmission to be sent in the PSFCH transmission opportunity.

[0092] For example, in some cases, the responding UE may be configured with a PSFCH power control parameter (e.g., d1-P0-PSFCH) that indicates a P0 value for PSFCH power control based on downlink path loss. In such cases, when the responding UE is provided with the d1-P0-PSFCH parameter to configure PSFCH power control based on downlink path loss, the responding UE may calculate the required (e.g., minimum) PSFCH transmit power as:

[0093] P PSFCH,one =P O,PSFCH +10log 10 (2 μ )+α PSFCH PL,

[0094] Among them, P O,PSFCH is the value of dl-P0-PSFCH; μ is the subcarrier spacing of the active bandwidth part; α PSFCH is a coefficient for path loss compensation, whose value is a parameter indicating the α value of downlink path loss based power control of PSFCH (e.g., dl-Alpha-PSFCH), or a value of one (1) when the parameter indicating the α value of downlink path loss based power control of PSFCH is not configured; and when the active sidelink bandwidth portion is on serving cell c, PL = PL b,f,c (q d). Thus, when the responding UE is configured with dl-P0-PSFCH for downlink path loss-based PSFCH power control, the responding UE may calculate the required PSFCH transmit power using the equation provided above based on downlink path loss measurements associated with one or more reference signal resources. For example, in some aspects, when the responding UE is configured to monitor the PDCCH in serving cell c to detect DCI having format 0_0, the reference signal resources may correspond to the resources used by the responding UE to determine the power for PUSCH transmissions scheduled by DCI messages having format 0_0 in serving cell c. Alternatively, when the responding UE is not configured to monitor the PDCCH in serving cell c to detect DCI having format 0_0, the reference signal resources used to calculate the required PSFCH transmit power may correspond to the synchronization signal blocks (SSBs) used by the responding UE to obtain the master information block (MIB). Alternatively, in a case where the responding UE is not configured with dl-P0-PSFCH for downlink path loss based PSFCH power control, the responding UE may determine how many PSFCH transmissions to send in a PSFCH transmission opportunity, and then determine the PSFCH transmission power based on the maximum transmit power PSFCH and the number of PSFCH transmissions (e.g., instead of the dl-P0-PSFCH parameter for downlink path loss based PSFCH power control).

[0095] In general, as described herein, a responding UE may support up to N of the PSFCH transmission opportunities. max,PSFCH simultaneous PSFCH transmissions, whereby the responding UE may need to transmit from N scheduled PSFCH transmission opportunities. sch,Tx,PSFCH Select N PSFCHs to be sent in a given PSFCH transmission opportunity Tx,PSFCH Specifically, N is selected to be sent in the PSFCH transmission opportunity. Tx,PSFCH The number of PSFCH transmissions scheduled to be sent in the PSFCH transmission opportunity may depend on whether the number of PSFCH transmissions scheduled to be sent in the PSFCH transmission opportunity exceeds the maximum number of simultaneous PSFCH transmissions supported by the responding UE, and / or may depend on whether the responding UE is configured with the dl-P0-PSFCH parameter for PSFCH power control based on downlink path loss.

[0096] For example, in N sch,Tx,PSFCH ≤N max,PSFCH (e.g., the number of PSFCH transmissions scheduled in the PSFCH transmission opportunity does not exceed the maximum number of simultaneous PSFCH transmissions supported by the responding UE) and d1-PO-PSFCH is configured, the number of PSFCH transmissions selected for transmission may be equal to the number of PSFCH transmissions scheduled in the PSFCH transmission opportunity (e.g., N Tx,PSFCH=N sch,Tx,PSFCH ), and when the total transmit power of the scheduled PSFCH does not exceed the maximum output power, and P PSFCH,k (i) = P PSFCH,one (For example, P PSFCH,one +10log 10 (N sch,Tx,PSFCH )≤P CMAX , where P CMAX is the maximum output power).

[0097] Otherwise, in N sch,Tx,PSFCH ≤N max,PSFCH And dl-P0-PSFCH is configured, but N is scheduled in the PSFCH transmission opportunity sch,Tx,PSFCH When the total transmit power of the PSFCHs exceeds the maximum output power, the responding UE may first transmit the N sch,Tx,PSFCH In ascending order of the corresponding priority value, any PSFCH transmission in the PSFCH transmissions, and then in the N PSFCH transmissions carrying the conflict information sch,Tx,PSFCH The N to be transmitted in a PSFCH opportunity is determined autonomously in ascending order of priority value on any of the PSFCH transmissions. Tx,PSFCH In other words, the PSFCH transmission carrying HARQ feedback always has a higher priority than the PSFCH transmission carrying collision information, and the priority values ​​in the PSFCH transmission carrying HARQ feedback and the PSFCH transmission carrying collision information can be determined in ascending order based on the priority values ​​associated with the PSFCH transmissions. Therefore, the responding UE can determine N to be sent in the PSFCH opportunity. Tx,PSFCH PSFCH is sent, so that For 1≤i≤8, M i is the number of PSFCH transmissions with priority value i carrying HARQ feedback, and for i>8, M i is the number of PSFCH transmissions with priority value i-8 of PSFCH transmissions with collision information, and K may be defined as the maximum value satisfying the following expression:

[0098]

[0099] or zero (0) if there is no value that satisfies the preceding expression, and

[0100] P PSFCH,k (i) = min(P CMAX -10log 10 (N Tx,PSFCH ),P PSFCH,one )

[0101] Among them, P CMAX -10log 10 (N Tx,PSFCH ) is the allowed transmission power, and P PSFCH,one is the required transmit power. Therefore, N Tx,PSFCH Subject to a lower limit or minimum, the number of PSFCH transmissions selected for actual transmission in a PSFCH transmission opportunity must equal or exceed the number given by Defined lower limit.

[0102] However, in some cases, the number of PSFCH transmissions scheduled in a PSFCH transmission opportunity may exceed the maximum number of simultaneous PSFCH transmissions supported by the responding UE. sch,Tx,PSFCH >N max,PSFCH ), and when the dl-P0-PSFCH parameter is configured, the responding UE may select the maximum number of simultaneous PSFCH transmissions supported by the responding UE from the PSFCH transmissions scheduled in the PSFCH transmission opportunity based first on the priority field value associated with any of the scheduled PSFCH transmissions carrying HARQ feedback in ascending order, and then based on the priority field value associated with any of the scheduled PSFCH transmissions carrying collision information in ascending order. For example, in N max,PSFCH The total transmission power of PSFCHs does not exceed P CMAX (For example, P PSFCH,one +10log 10 (N max,PSFCM )≤P CMAX ), the number of PSFCH transmissions selected to be transmitted in the PSFCH transmission opportunity may be equal to the maximum number of simultaneous PSFCH transmissions supported by the responding UE. PSFCH,k (i) = P PSFCH,one (For example, the required transmit power is determined based on the d1-P0-PSFCH parameter.) Otherwise, max,PSFCH The total transmission power of PSFCHs exceeds P CMAX In the case of a collision, the responding UE may autonomously select N in ascending order of the corresponding priority field value on any PSFCH transmission carrying HARQ feedback, and then in ascending order of the priority value on any PSFCH transmission carrying collision information. Tx,PSFCH PSFCH is sent, so that Therefore, when the number of PSFCH transmissions scheduled in a PSFCH transmission opportunity exceeds the maximum number of simultaneous PSFCH transmissions supported by the responding UE, the responding UE may first select the maximum number of simultaneous PSFCH transmissions supported by the responding UE from the PSFCH transmissions scheduled in the PSFCH transmission opportunity, and then use the same priority rules that apply when the number of PSFCH transmissions scheduled in the PSFCH transmission opportunity does not exceed the maximum number of simultaneous PSFCH transmissions supported by the responding UE to select the PSFCH transmission to be sent in the PSFCH transmission opportunity.

[0103] Alternatively, in the case where downlink path loss-based PSFCH power control is not configured (e.g., the d1-P0-PSFCH parameter is not configured), the responding UE may autonomously select the N 100 100 100 0 ... Tx,PSFCH PSFCH is sent, so that N Tx,PSFCH ≥1, where P CMAX N can be selected for transmission in PSFCH transmission opportunity Tx,PSFCH The PSFCH is sent to determine.

[0104] Generally speaking, the priority rules for handling multiple simultaneous PSFCH transmissions described above are defined for sidelink operation in a licensed band and therefore do not take into account certain factors that may affect sidelink operation in an unlicensed band. For example, in SL-U, where COT sharing is not available, a UE that needs to transmit a sidelink message (e.g., a PSCCH message, a PSSCH message, and / or a PSFCH message) may need to perform a Cat-4 LBT procedure before transmitting. However, where COT sharing is available, a UE that needs to transmit may perform a Cat-2 LBT procedure, which may enable the UE to access the unlicensed channel more easily. For example, when UE-to-UE COT sharing is implemented (e.g., as described above with reference to Figure 6 As described herein, when at least one of the PSFCH transmissions being transmitted by the responding UE in a symbol or slot within a set of resource blocks (RBs) corresponding to a shared COT is intended for or directed to a transmitting UE initiating the COT, the responding UE attempting to transmit one or more PSFCH transmissions on an unlicensed channel may utilize the COT shared by the transmitting UE initiating the COT. In addition, in some cases, the responding UE may be allowed to use the shared COT to transmit one or more PSFCH transmissions to other UEs (e.g., other than the transmitting UE initiating the COT).

[0105] However, as described herein, due to the capabilities of the responding UE, the responding UE may be subject to a limit on the maximum number of PSFCH transmissions that can be sent simultaneously in a given PSFCH opportunity (e.g., the maximum number of simultaneous PSFCH transmissions supported by the UE, N ). max,PSFCH ) and / or maximum transmit power constraints (e.g., P CMAX applicable value). For example, when the number of simultaneous PSFCH transmissions scheduled in a PSFCH transmission opportunity exceeds the capability of the responding UE and / or the total transmit power of the PSFCH transmissions to be sent simultaneously exceeds the maximum transmit power, the responding UE may apply a priority rule to select the PSFCH transmissions to be sent based on the information carried by the PSFCH transmissions (e.g., where HARQ feedback has a higher priority than a collision indication) and based on an ascending order of the priority values ​​of the information carried by each PSFCH transmission. However, in an unlicensed band, in-COT PSFCH transmissions (e.g., PSFCH transmissions within a shared COT) and out-of-COT PSFCH transmissions (e.g., PSFCH transmissions outside a shared COT) may use different channel access types and, therefore, may have different channel access probabilities. Furthermore, in an in-COT PSFCH transmission, whether the PSFCH transmission is intended for the UE that initiated the shared COT may affect whether the responding UE can use the shared COT to perform in-COT PSFCH transmissions towards one or more UEs other than the UE that initiated the shared COT. For example, in a situation where one or more PSFCH transmissions intended for a UE initiating a shared COT are dropped (e.g., because the number of simultaneous PSFCH transmissions scheduled in a PSFCH transmission opportunity exceeds the capability of the responding UE and / or the total transmit power of the PSFCH transmissions to be sent simultaneously exceeds the maximum transmit power), the responding UE may be unable to use the shared COT to send PSFCH transmissions toward any UE other than the UE initiating the COT, which may increase the probability of LBT failure for PSFCH transmissions in the COT directed to any UE other than the UE initiating the COT.

[0106] For example, reference Figure 7 , example 700 depicts a scenario in which a responding UE (UE0) receives multiple PSSCH transmissions associated with a PSFCH transmission opportunity on an unlicensed sidelink channel. Thus, the responding UE may have multiple PSFCH transmissions to be sent in a PSFCH transmission opportunity (shown as a PSFCH symbol). For example, Figure 7As shown, the responding UE may receive a first PSSCH transmission from a first UE (UE1), a second PSSCH transmission from a second UE (UE2), a third PSSCH transmission from a third UE (UE3), a fourth PSSCH transmission from a fourth UE (UE4), and a fifth PSSCH transmission from a fifth UE (UE5), wherein each PSFCH to be transmitted in a PSFCH transmission opportunity may correspond to the time and frequency position of the associated PSSCH transmission. For example, in Figure 7 In the PSFCH k, the PSFCH k can point to the UE k PSFCH transmission (e.g., PSFCH 1 is directed to UE1, PSFCH 2 is directed to UE2, and so on). In addition, in example 700, the first transmitting UE (UE1) may be the UE that initiates the COT, which may be shared with the responding UEs such that the responding UEs may use a portion of the shared COT for PSFCH transmission (e.g., the last time slot of the shared COT, which includes the PSFCH transmission opportunity). Thus, Figure 7 As shown, PSFCH transmissions 1 to 3 are in-COT PSFCH transmissions (e.g., because PSFCH transmissions 1 to 3 are within RB set 0 associated with the shared COT), and PSFCH transmissions 4 and 5 are out-of-COT PSFCH transmissions (e.g., because PSFCH transmissions 4 and 5 are within RB set 1 that is outside the RB set associated with the shared COT). Therefore, as shown by reference numeral 710, the responding UE may not be able to use COT sharing to transmit the out-of-COT PSFCH transmission (e.g., the responding UE may need to perform a Cat-4 LBT procedure to transmit the out-of-COT PSFCH transmission), and thus the out-of-COT PSFCH transmission may have a lower channel access probability than the in-COT PSFCH transmission.

[0107] In addition, in the event that the responding UE is unable to send all five PSFCH transmissions scheduled in the PSFCH transmission opportunity (e.g., due to maximum transmit power limitations and / or UE capability limitations), the responding UE may need to select one or more PSFCH transmissions to be sent. For example, in the event that the responding UE applies the legacy priority rules described above and the PSFCH transmissions scheduled in the PSFCH transmission opportunity all carry the same type of information (e.g., HARQ feedback or collision information), the PSFCH transmissions may be sorted in ascending order based on the priority field value. For example, as shown, the PSFCH transmission associated with the PSSCH from UE1 has priority 5 (p1=5), the PSFCH transmission associated with the PSSCH from UE2 has priority 1 (p2=1), the PSFCH transmission associated with the PSSCH from UE3 has priority 3 (p3=3), the PSFCH transmission associated with the PSSCH from UE4 has priority 1 (p4=1), and the PSFCH transmission associated with the PSSCH from UE5 has priority 3 (p5=3). PSFCH transmissions are sorted in ascending order of priority value based on a priority rule (e.g., where a larger priority value corresponds to a lower priority), with PSFCH transmissions directed to UE4 and UE2 having the highest priority, PSFCH transmissions directed to UE3 and UE5 having the second highest priority, and PSFCH transmissions directed to UE1 having the lowest priority.

[0108] Therefore, as shown in reference numeral 720, applying the legacy priority rules to handle simultaneous PSFCH transmissions (e.g., when the PSFCH transmissions scheduled in the PSFCH transmission opportunity exceed the UE capabilities and / or maximum transmit power limit) may cause the responding UE to drop the PSFCH transmission to UE1 (which has the lowest probability). As a result, the responding UE may not be able to use the COT shared by UE1 for PSFCH transmissions in other COTs to UE2 and UE-3 because there is no PSFCH transmission intended for the UE (e.g., UE1) that initiated the shared COT. In this case, the channel access probability for the PSFCH transmissions to UE2 and UE-3 will be lower because the responding UE will need to perform a Cat-4 LBT procedure instead of a Cat-2 LBT procedure. However, if the responding UE were to send a PSFCH transmission directed to UE1, the responding UE would be able to use the shared COT to send to all PSFCH transmissions in the PSFCH transmissions in the COTs of UE1, UE2, and UE3 (subject to UE capabilities and / or maximum transmit power limits). Thus, some aspects described herein relate to techniques associated with priority handling for simultaneous PSFCH transmissions in an unlicensed channel, where the priority handling may include one or more rules based on whether the PSFCH transmissions scheduled in the PSFCH transmissions are within or outside a shared COT.

[0109] As indicated above, Figure 7 are provided as examples. Other examples can be found in the Figure 7 The examples described are different.

[0110] Figure 8 is a diagram illustrating an example 800 associated with selecting multiple PSFCH transmissions to be sent in a PSFCH transmission opportunity when using a shared COT in SL-U according to the present disclosure.

[0111] In some aspects, as described herein, example 800 relates to a scenario in which a responding UE receives multiple PSSCH transmissions associated with a PSFCH transmission opportunity on an unlicensed channel and at least one PSFCH transmission scheduled in the PSFCH transmission opportunity is in a shared COT. Thus, in such a scenario, the responding UE may determine a minimum number of PSFCH transmissions to be transmitted in the PSFCH opportunity based on whether the PSFCH transmission scheduled to be transmitted in the PSFCH opportunity is an in-COT PSFCH transmission or an out-of-COT PSFCH transmission. For example, in a scenario in which the responding UE supports at most N PSFCH transmissions in the PSFCH transmission opportunity, the responding UE may determine a minimum number of PSFCH transmissions to be transmitted in the PSFCH opportunity based on whether the PSFCH transmission scheduled to be transmitted in the PSFCH opportunity is an in-COT PSFCH transmission or an out-of-COT PSFCH transmission. max,PSFCH simultaneous PSFCH transmissions and the responding UE has N to transmit in a given PSFCH transmission opportunity sch,Tx,PSFCHIn the case of multiple PSFCH transmissions, the UE may determine N based on whether the PSFCH transmission is an in-COT or out-of-COT PSFCH transmission if at least one of the PSFCH transmissions in the symbols or slots within the set of RBs corresponding to the shared COT is intended for the UE initiating the shared COT. Tx,PSFCH (e.g., a value corresponding to the minimum number of PSFCH transmissions to be sent in a PSFCH transmission opportunity).

[0112] For example, in the case where the number of PSFCH transmissions scheduled in a PSFCH transmission opportunity is less than or equal to (e.g., does not exceed) the maximum number of simultaneous PSFCH transmissions supported by the responding UE and the dl-P0-PSFCH parameter that configures PSFCH power control based on downlink path loss is configured, the responding UE may schedule PSFCH transmissions in the PSFCH transmission opportunity with a maximum number of PSFCH transmissions exceeding P. CMAX Determine N under the condition of total transmission power Tx,PSFCH In such cases, the responding UE may determine N Tx,PSFCH The value of N Tx,PSFCH ≥X≥1 (for example, X is N Tx,PSFCH , and X must be greater than or equal to 1). Additionally, in some aspects, X can be defined as:

[0113]

[0114] Where K is to ensure that all The total transmission power of PSFCHs does not exceed P CMAX The maximum value of , and Y is the PSFCH index of the specific PSFCH that satisfies the conditions for allowing the responding UE to utilize the shared COT. For example, in some aspects, each PSFCH transmission scheduled to be transmitted in a PSFCH transmission opportunity may be based on the above reference Figure 6The priority rules described are assigned indexes in ascending order (e.g., where any PSFCH transmission carrying HARQ feedback has a higher priority than any PSFCH transmission carrying conflicting information, and PSFCH transmissions carrying the same information type are prioritized in ascending order based on the priority field value). In addition, for any PSFCH transmissions with the same priority, the PSFCH transmissions may be indexed based on the time domain and / or frequency domain location of the associated PSSCH. In some aspects, the specific PSFCH that meets the conditions for allowing the responding UE to utilize the shared COT may correspond to the first PSFCH transmission in the shared COT, the first PSFCH transmission in the shared COT and intended for a UE initiating the shared COT, the last PSFCH transmission of a PSFCH in at least one COT ensured to be transmitted in the shared COT or the set of RBs corresponding to the shared COT, or the last PSFCH transmission of a PSFCH in at least one COT ensured to be transmitted in the shared COT or the set of RBs corresponding to the shared COT.

[0115] Alternatively, in the case where the number of PSFCH transmissions scheduled in a PSFCH transmission opportunity exceeds the maximum number of simultaneous PSFCH transmissions supported by the responding UE and the d1-P0-PSFCH parameter is configured, the responding UE may first select N PSFCH transmissions to be sent in the PSFCH transmission opportunity based on the priority rules described in further detail above. max,PSFCH PSFCH is sent, where N max,PSFCH is the maximum number of simultaneous PSFCH transmissions supported by the responding UE. The responding UE may then max,PSFCH Select N out of the PSFCHs sent Tx,PSFCH PSFCH is sent, where N Tx,PSFCH ≥X≥1, K is to ensure that all The total transmission power of PSFCHs does not exceed P CMAX The maximum value of Y, and the PSFCH index of the specific PSFCH that meets the conditions allowing the responding UE to utilize the shared COT does not exceed N max,PSFCH In the case of PSFCH index or when PSFCH index exceeds N max,PSFCH In the case of

[0116] Alternatively, in the case where the d1-P0-PSFCH parameter is not configured (e.g., the responding UE cannot determine the required PSFCH transmit power based on the downlink path loss), the responding UE may select N to be transmitted in the PSFCH transmission opportunity based on existing priority rules. Fx,PSFCH PSFCH is sent, where N Tx,PSFCH≥Y≥1, and Y is the PSFCH index of a specific PSFCH that the responding UE is allowed to utilize the shared COT (e.g., corresponding to the first PSFCH transmission in the shared COT, the first PSFCH transmission in the shared COT and intended for a UE initiating a shared COT, the last PSFCH transmission of a PSFCH in at least one COT ensured to be sent in the shared COT or the set of RBs corresponding to the shared COT, or the last PSFCH transmission of a PSFCH in at least one COT ensured to be sent in the shared COT or the set of RBs corresponding to the shared COT).

[0117] For example, Figure 8 As shown, a responding UE (e.g., UE0) may receive multiple PSSCH transmissions associated with a PSFCH transmission opportunity, including at least one PSFCH transmission directed to a transmitting UE that initiates a COT shared with the responding UE. As shown in reference numeral 810, the UE may select a minimum number of PSFCH transmissions to be sent in a PSFCH transmission opportunity based on whether the PSFCH transmission is within or outside the shared COT. As described herein, example 800 relates to a scenario in which the number of PSFCH transmissions scheduled in a PSFCH transmission opportunity does not exceed the maximum number of simultaneous PSFCH transmissions supported by the responding UE. However, in the event that the number of PSFCH transmissions scheduled in a PSFCH transmission opportunity exceeds the maximum number of simultaneous PSFCH transmissions supported by the responding UE, a similar technique may be applied (e.g., the responding UE may first select the maximum supported number of simultaneous PSFCH transmissions from the scheduled PSFCH transmissions using the legacy priority rule, and then may apply the same technique as applied when the number of scheduled PSFCH transmissions does not exceed the maximum simultaneous PSFCH transmissions supported by the responding UE).

[0118] For example, as shown by reference numeral 820, each PSFCH transmission scheduled to be transmitted in a PSFCH transmission opportunity may be indexed according to the priority value and / or time / frequency location of the associated PSSCH. -2 and UE5 are associated with the highest priority values ​​(p2=1 and p5=1) and are associated with the PSFCH transmissions from UE -5 The associated PSSCH transmission from UE -2 The associated PSSCH transmissions of UE2 are earlier in the time domain and lower in the frequency domain. Therefore, the PSFCH transmission to UE2 is assigned index 1, and the PSFCH transmission to UE5 is assigned index 2. In addition, the same pattern can be applied to the remaining PSFCH transmissions to UE1, UE3, and UE4. In this example, based on the legacy priority rule, PSFCH1 = PSFCH2 > PSFCH3 > PSFCH4 > PSFCH5. In one example, assuming PPSFCH1 +P PSFCH2 +P PSFCH3 +P PSFCH4 ≤P CMAX , but P PSFCH1 +P PSFCH2 +P PSFCH3 +P PSFCH4 +P PSFCH5 >P CMAX , K can have a value of 3, which is to ensure that all The total transmission power of PSFCHs does not exceed P CMAX Therefore, based on the specified N Tx,PSFCH ≥X and According to the rule, X may have a value corresponding to max(M1+M2+M3,Y), where M1 has a value of 2 (e.g., based on the presence of two PSFCH transmissions with a priority of 1), M2 has a value of 1 (e.g., based on the presence of one PSFCH transmission with a priority of 2), and M3 has a value of 1 (e.g., based on the presence of one PSFCH transmission with a priority of 3).

[0119] Therefore, in Figure 8 In the example 800 depicted in FIG, X may have a value corresponding to max(M1+M2+M3,Y)=max(4,Y), where Y is the PSFCH index of the specific PSFCH that the responding UE is allowed to utilize the shared COT. For example, in the case where the specific PSFCH that the responding UE is allowed to utilize the shared COT is the first PSFCH transmitted in the shared COT, Y has a value of 1 (e.g., corresponding to PSFCH 1 directed to UE2), such that N Tx,PSFCH ≥ 4. Alternatively, in the case where the specific PSFCH that allows the responding UE to utilize the shared COT is the first PSFCH transmission in the shared COT and intended for the UE initiating the shared COT (e.g., UE1), Y has a value of 5 (e.g., corresponding to PSFCH 5 directed to UE1), whereby N Tx,PSFCH ≥ 5. Alternatively, in the case where the specific PSFCH that allows the responding UE to utilize the shared COT is the last PSFCH transmission that ensures that at least one PSFCH in the COT is transmitted in the shared COT or the RB set corresponding to the shared COT, Y has a value of 1 (e.g., corresponding to PSFCH 1 directed to UE2), whereby N Tx,PSFCH ≥ 4. Alternatively, in the case where the specific PSFCH that allows the responding UE to utilize the shared COT is the last PSFCH transmission in the shared COT or RB set that is guaranteed to be sent for a PSFCH in at least one COT intended for the UE initiating the shared COT, Y has a value of 5 (e.g., corresponding to PSFCH 5 directed to UE1), whereby N Tx,PSFCH≥ 5. In this way, the responding UE can ensure that the responding UE will be able to select a minimum number (or lower limit) of PSFCH transmissions for PSFCH transmission opportunities by means of a shared COT.

[0120] As indicated above, Figure 8 are provided as examples. Other examples can be found in the Figure 8 The examples described are different.

[0121] Figures 9A to 9B is a diagram illustrating an example 900 associated with selecting a PSFCH transmission to be sent in a PSFCH transmission opportunity when using a shared COT in SL-U according to the present disclosure.

[0122] In some aspects, as described herein, example 900 relates to a scenario in which a responding UE receives multiple PSSCH transmissions associated with a PSFCH transmission opportunity on an unlicensed channel and at least one PSFCH transmission scheduled in the PSFCH transmission opportunity is in a shared COT. For example, as described herein, a PSFCH transmission scheduled in a PSFCH transmission opportunity may typically carry HARQ feedback or collision information for the associated PSSCH. Thus, in such a case, when the scheduled PSFCH transmissions have a total transmit power that exceeds a maximum transmit power limit and / or the number of scheduled PSFCH transmissions exceeds a maximum number of simultaneous PSFCH transmissions supported by the responding UE, the responding UE may select N PSFCH transmissions scheduled to be transmitted in the PSFCH opportunity. sch,Tx,PSFXH Select N of the PSFCHs to be sent in the PSFCH opportunity Tx,PSFCH PSFCH is sent.

[0123] For example, the number of PSFCH transmissions scheduled in a PSFCH transmission opportunity does not exceed the maximum number of simultaneous PSFCH transmissions supported by the responding UE (e.g., N sch,Tx,PSFCH ≤N max,PSFCH ) and configured with the dl-P0-PSFCH parameter for configuring PSFCH power control based on downlink path loss, the responding UE may send a power of more than P on the scheduled PSFCH. CMAX In the case of the total transmission power of Tx,PSFCH In such cases, the responding UE may initially select N on the PSFCH transmission in one or more COTs. Tx,PSFCH PSFCH transmissions, and one or more PSFCH transmissions may then be selected from the set of PSFCH transmissions outside the COT such that N Tx,PSFCH ≥X≥1, where And K is to ensure that all The total transmission power of PSFCHs does not exceed P CMAX The maximum value, M i is the number of PSFCHs with the i-th priority.

[0124] For example, in some aspects, among PSFCH transmissions in the COT, the responding UE may generally select the PSFCH transmission to be sent in the PSFCH transmission opportunity based on a priority value associated with the PSFCH transmission to be sent in the PSFCH transmission opportunity, information carried in the PSFCH transmission to be sent in the PSFCH transmission opportunity, and / or a type of UE intended to receive the PSFCH transmission to be sent in the PSFCH transmission opportunity. For example, in some aspects, the responding UE may use the information carried in the PSFCH transmission as a primary criterion for selecting the PSFCH transmission to be sent in the PSFCH transmission opportunity, and may use the priority value associated with the PSFCH transmission as a secondary criterion (e.g., the responding UE may first select one or more PSFCH transmissions in ascending order of corresponding priority field values ​​on any PSFCH transmission that carries HARQ feedback for the associated PSSCH transmission, and may then select one or more PSFCH transmissions in ascending order of corresponding priority field values ​​on any remaining PSFCH transmissions that carry conflicting information).

[0125] Alternatively, in some aspects, in a PSFCH transmission in a COT, the responding UE may use the type of UE intended to receive the PSFCH transmission as a primary criterion for selecting the PSFCH transmission to be transmitted in the PSFCH transmission opportunity, and may use the priority value associated with the PSFCH transmission as a secondary criterion. For example, in some aspects, the responding UE may first select one or more PSFCH transmissions in ascending order of corresponding priority field values ​​on any PSFCH transmission directed to the transmitting UE that initiated the shared COT, and may then select one or more PSFCH transmissions in ascending order of corresponding priority field values ​​on any remaining PSFCH transmissions directed to transmitting UEs other than the COT initiating UE. Alternatively, in some aspects, the responding UE may first select the PSFCH transmission associated with the lowest priority field value (e.g., the highest priority) or the PSFCH transmission associated with the earliest time slot for each RB set on the PSFCH transmission intended for the COT initiating UE (e.g., in the case where there are multiple PSFCH transmissions intended for the COT initiating UE and having the same priority), and the responding UE may then select one or more PSFCH transmissions in ascending order of priority values ​​on the remaining PSFCH transmissions.

[0126] Alternatively, in some aspects, the responding UE may use the type of UE intended to receive the PSFCH transmission as a primary criterion for selecting the PSFCH transmission to be sent in the PSFCH transmission opportunity, may use information carried in the PSFCH transmission as a secondary criterion, and may use a priority value associated with the PSFCH transmission as a tertiary criterion. For example, in some aspects, the responding UE may first select one or more PSFCH transmissions in ascending order of corresponding priority field values ​​on any PSFCH transmission that carries HARQ feedback for the associated PSSCH and is intended for the COT-initiating UE, may then select in ascending order of corresponding priority field values ​​on any PSFCH transmission that carries conflicting information and is intended for the COT-initiating UE, may then select in ascending order of corresponding priority field values ​​on any PSFCH transmission that carries HARQ feedback and is intended for a UE other than the COT-initiating UE, and may then select in ascending order of priority values ​​on any PSFCH transmission that carries conflicting information and is intended for a UE other than the COT-initiating UE. Alternatively, in some aspects, the responding UE may first select the PSFCH transmission associated with the lowest priority field value (e.g., the highest priority) or the PSFCH transmission associated with the earliest time slot for each RB set on any PSFCH transmission intended for the COT initiating UE (e.g., in the case where there are multiple PSFCH transmissions intended for the COT initiating UE with the same priority), and may then select the PSFCH transmissions on the remaining PSFCH transmissions in ascending order of corresponding priority field values ​​on the PSFCH transmissions carrying HARQ feedback, and may then select in ascending order of priority field values ​​on any PSFCH transmissions carrying conflicting information.

[0127] In some aspects, after selecting PSFCH transmissions in a COT using the techniques described above, the number of PSFCH transmissions in the selected COT does not exceed N Tx,PSFCHIn the case where the responding UE selects one or more out-of-COT PSFCH transmissions to be included in the PSFCH transmission in the PSFCH transmission opportunity. For example, among the set of out-of-COT PSFCH transmissions, the responding UE may select one or more PSFCH transmissions to be sent in the PSFCH transmission opportunity based on the priority values ​​of the out-of-COT PSFCH transmissions and / or the information carried in the out-of-COT PSFCH transmissions. For example, in some aspects, the responding UE may first select one or more out-of-COT PSFCH transmissions in ascending order of priority field values ​​on any out-of-COT PSFCH transmissions among the out-of-COT PSFCH transmissions that carry HARQ feedback, and may then select one or more out-of-COT PSFCH transmissions in ascending order of priority field values ​​on any out-of-COT PSFCH transmissions among the out-of-COT PSFCH transmissions that carry collision information. Alternatively, in the case where the responding UE communicates according to an SL-U configuration that does not support collision indication, the out-of-COT PSFCH transmission may be selected based solely on the priority values ​​of the out-of-COT PSFCH transmissions.

[0128] For example, as in Figure 9A As shown by reference numeral 910 in FIG, the responding UE may select one or more PSFCH transmissions to be sent in a PSFCH transmission opportunity using the criteria described above, which is typically based on whether the PSFCH transmission is within or outside the shared COT. For example, Figure 9A A scenario is depicted in which a responding UE receives multiple PSSCH transmissions associated with PSFCH transmission opportunities, including one or more PSFCH transmissions directed to a UE initiating a shared COT (e.g., UE1 in the illustrated example). Figure 9A In the example illustrated in , each PSFCH transmission scheduled to be sent in a PSFCH transmission opportunity may carry the same type of information (e.g., HARQ feedback or collision information). Therefore, in the case where the responding UE uses the information carried in the PSFCH transmission as the primary criterion and the priority value as the secondary criterion to select one or more PSFCH transmissions in the COT, the various PSFCH transmissions may be prioritized as PSFCH 2>PSFCH 3>PSFCH 1-1=PSFCH 1-2>PSFCH 4>PSFCH 5, where PSFCH k may refer to the PSFCH k to be sent to the UE. k PSFCH, and PSFCH ki may refer to the presence of a UE k In case of multiple PSFCH transmissions, the k The i-th PSFCH.

[0129] Alternatively, in a case where the responding UE first selects the PSFCH transmission in the COT in ascending order of the corresponding priority field values ​​on any PSFCH transmission intended for the COT initiating UE, and then selects the PSFCH transmission in the COT in ascending order of the priority values ​​on any PSFCH transmission intended for UEs other than the COT initiating UE, the various PSFCH transmissions may be prioritized as PSFCH1-1=PSFCH1-2>PSFCH2>PSFCH3>PSFCH4>PSFCH5. Alternatively, in a case where the responding UE first selects the PSFCH transmission associated with the lowest priority field value or the PSFCH transmission associated with the earliest time slot for each RB set on any PSFCH transmission intended for the COT initiating UE, and then selects the PSFCH transmission on the remaining PSFCH transmissions in ascending order of the priority values, the various PSFCH transmissions may be prioritized as PSFCH1-1>PSFCH2>PSFCH3>PSFCH1-2>PSFCH4>PSFCH5. In addition, in P PSFCH2 +P PSFCH3 +P PSFCH1-1 +P PSFCH1-2 +P PSFCH4 ≤P CMAX And P PSFCH2 +P PSFCH3 +P PsFCH1-1 +P PSFCH1-2 +P PSFCH4 +P PSFCH5 >P CMAX In the scenario, X may have the value 4, based on the definition, thus And K is to ensure that all The total transmission power of PSFCHs does not exceed P CMAX The maximum value, M i is the number of PSFCHs with the i-th priority.

[0130] Additionally or alternatively, the total transmit power of the PSFCH transmissions scheduled to be transmitted in the PSFCH transmission opportunity exceeds P CMAX In the case of a PSFCH transmission opportunity, the responding UE may select N to be sent based on one or more rules. Tx,PSFCH PSFCH is sent, where N Tx,PSFCh ≥X≥1, And K is to ensure that all The total transmission power of PSFCHs does not exceed P CMAX The maximum value, M i is the number of PSFCHs with priority i. For example, if the total transmit power of PSFCHs scheduled for PSFCH transmission opportunities exceeds P CMAX, the responding UE may first select the PSFCH transmission associated with the lowest priority field value or the PSFCH transmission associated with the earliest time slot for each RB set over the PSFCH transmissions in the COT (e.g., in the case where there are multiple PSFCH transmissions with the same priority intended for the COT initiating UE), and may then select the PSFCH transmission over the remaining PSFCH transmissions in ascending order of corresponding priority field values ​​over any PSFCH transmissions carrying HARQ feedback, and then in ascending order of priority values ​​over any PSFCH transmissions carrying colliding information (e.g., based on the legacy priority rules described elsewhere herein). For example, when applying this rule to Figure 9A When selecting a PSFCH transmission to be sent in a PSFCH transmission opportunity in the scenario depicted in

[0045] , the various PSFCH transmissions may be prioritized such that PSFCH 2 = PSFCH 4 > PSFCH 3 = PSFCH 5 > PSFCH 1-1 = PSFCH 1-2.

[0131] Alternatively, if the total transmission power of the PSFCH transmissions scheduled for the PSFCH transmission opportunity exceeds P CMAX , the responding UE may first select the PSFCH transmission associated with the lowest priority field value or the PSFCH transmission associated with the earliest time slot for each RB set on the PSFCH transmissions in the COT intended for the COT initiating UE (e.g., in the case where there are multiple PSFCH transmissions intended for the COT initiating UE with the same priority), and the responding UE may then select the PSFCH transmissions on the remaining PSFCH transmissions in ascending order of corresponding priority field values ​​on any PSFCH transmissions carrying HARQ feedback and then in ascending order of priority values ​​on any PSFCH transmissions carrying colliding information (e.g., based on the legacy priority rule described herein). For example, when applying this rule to Figure 9A When selecting a PSFCH transmission to be sent in a PSFCH transmission opportunity in the scenario depicted in

[0045] , various PSFCH transmissions may be prioritized such that PSFCH 1-1>PSFCH 2=PSFCH 4>PSFCH 3=PSFCH 5>PSFCH 1-2.

[0132] Furthermore, although techniques for selecting a PSFCH transmission to transmit in a PSFCH transmission opportunity are described herein with respect to a scenario where the number of PSFCH transmissions scheduled in the PSFCH transmission opportunity does not exceed the maximum number of simultaneous PSFCH transmissions supported by the responding UE, similar techniques may be used when the number of PSFCH transmissions scheduled in the PSFCH transmission opportunity exceeds the maximum number of simultaneous PSFCH transmissions supported by the responding UE. For example, in such a case (e.g., when N sch,Tx,PSFCH >Nmax,PSFCH and d1-P0-PSFCH is configured), the responding UE may first select N scheduled in the PSFCH transmission opportunity. sch,Tx,PSFCH Select N out of the PSFCHs sent max,PSFCH PSFCHs (e.g., using the techniques described above). For example, if N max,PSFCH The total transmission power of PSFCHs exceeds P CMAX , then the responding UE can max,PSFCH Select N out of the PSFCHs sent Tx,PSFCH PSFCH is sent, where N Tx,PSFCH ≥X≥1, And K is to ensure that all The total transmission power of PSFCHs shall not exceed P CMAX The maximum value, M i is the number of PSFCHs with the i-th priority.

[0133] For example, as in Figure 9B As shown by reference numeral 920 in FIG, when the number of PSFCH transmissions to be sent in a PSFCH transmission opportunity exceeds the capability of the responding UE, the responding UE may initially select one or more PSFCH transmissions to be discarded. For example, in some aspects, the responding UE may first select one or more PSFCH transmissions on the in-COT PSFCH transmissions and then may select one or more PSFCH transmissions on the out-of-COT PSFCH transmissions. In the illustrated example, N max,PSFCH =4, and there are 5 PSFCH transmissions scheduled to be sent in the PSFCH transmission opportunity. Therefore, the responding UE may need to select 4 PSFCH transmissions to be sent in the PSFCH transmission opportunity from the 5 PSFCH transmissions scheduled to be sent. For example, where the transmission in the COT is selected based on the information carried and then based on the priority value, the various PSFCH transmissions may be prioritized such that PSFCH 2>PSFCH 3>PSFCH 1>PSFCH 5>PSFCH 4 (e.g., PSFCH transmissions 1-3 in the COT have a higher priority than PSFCH transmissions 4-5 outside the COT, PSFCH 2 has the lowest priority field value corresponding to the highest priority among the PSFCH transmissions in the COT, and PSFCH 4 has the highest priority field value corresponding to the lowest priority among the PSFCH transmissions outside the COT). Therefore, in this example, the responding UE may discard PSFCH 4.

[0134] Alternatively, where transmissions in the COT are selected based first on the expected UE type and then on the priority value, the various PSFCH transmissions may be prioritized such that PSFCH 1>PSFCH 2>PSFCH 3>PSFCH 5>PSFCH 4 (e.g., PSFCH transmissions 1-3 in the COT have a higher priority than PSFCH transmissions 4-5 outside the COT, PSFCH 1 has the highest priority based on being directed to the COT-originating UE, PSFCH 2 in the COT has a lower priority field value (corresponding to a higher priority) than PSFCH 3 in the COT, and PSFCH 4 outside the COT has the highest priority field value corresponding to the lowest priority among the PSFCH transmissions outside the COT). Thus, in this example, the responding UE may similarly discard PSFCH 4, which has the lowest priority. As in Figure 9B As further shown in FIG. 1 by reference numeral 930, the responding UE may then select a PSFCH transmission to be transmitted in a PSFCH transmission opportunity from the remaining PSFCH transmissions, subject to any transmit power constraints. For example, the responding UE may select N PSFCH transmissions from the four PSFCH transmissions selected in the first step. Tx,PSFCH PSFCH is sent, if P PSFCH1 +P PSFCH2 +P PSFCH3 ≤P CMAX And P PSFCH1 +P PSFCH2 +P PSFCH3 +P PSFCH5 >P CMAX , then N tx,PSFCH ≥3.

[0135] Furthermore, in some aspects, the same or similar techniques may be applied in situations where the d1-PO-PSFCH parameters are not configured. For example, in such situations, the responding UE may use the techniques described herein to select N to be sent in a PSFCH transmission opportunity. Tx,PSFCH PSFCH is sent, where N Tx,PSFCH ≥1.

[0136] As indicated above, Figures 9A to 9B are provided as examples. Other examples can be found in the Figures 9A to 9B The examples described are different.

[0137] Figure 10 is a diagram illustrating an example process 1000, performed, for example, by a UE, in accordance with the present disclosure. Example process 1000 is an example of operations in which a UE (e.g., UE 120) performs techniques for priority handling of simultaneous PSFCHs in SL-U.

[0138] like Figure 10As shown, in some aspects, process 1000 may include receiving a plurality of PSSCH transmissions associated with PSFCH transmission opportunities on an unlicensed sidelink channel, wherein at least one of the PSFCH transmission opportunities is in a shared COT (block 1010). For example, a UE (e.g., using Figure 11 The receiving component 1102 and / or the communication manager 1106 depicted in the figure can receive multiple PSSCH transmissions associated with PSFCH transmission opportunities on an unlicensed sidelink channel, wherein at least one PSFCH transmission in the PSFCH transmission opportunities is in a shared COT, as described above.

[0139] As in Figure 10 As further shown in FIG. 1 , in some aspects, process 1000 may include determining a minimum number of PSFCH transmissions to be sent in a PSFCH transmission opportunity (block 1020). For example, a UE (e.g., using Figure 11 The communication manager 1106 depicted in FIG) may determine a minimum number of PSFCH transmissions to be sent in a PSFCH transmission opportunity, as described above.

[0140] As in Figure 10 As further shown in FIG, in some aspects, process 1000 may include selecting a set of PSFCH transmissions including at least a minimum number of PSFCH transmissions among the scheduled PSFCH transmissions based at least in part on whether a plurality of scheduled PSFCH transmissions associated with the PSFCH transmission opportunity are in a shared COT (block 1030). Figure 11 The communication manager 1106 depicted in FIG) may select a set of PSFCH transmissions including at least a minimum number of PSFCH transmissions among the scheduled PSFCH transmissions based at least in part on whether multiple scheduled PSFCH transmissions associated with the PSFCH transmission opportunity are in a shared COT, as described above.

[0141] As in Figure 10 As further shown in FIG, in some aspects, process 1000 may include transmitting, in a PSFCH transmission opportunity, the selected set of PSFCH transmissions on an unlicensed sidelink channel (block 1040). Figure 11 The transmitting component 1104 and / or the communication manager 1106 depicted in FIG may transmit the selected set of PSFCH transmissions on the unlicensed sidelink channel in the PSFCH transmission opportunity, as described above.

[0142] Process 1000 may include additional aspects, such as any single aspect or any combination of aspects described below and / or in conjunction with one or more other processes described elsewhere herein.

[0143] In a first aspect, a minimum number of PSFCH transmissions to be sent in a PSFCH transmission opportunity is based at least in part on PSFCH indices associated with PSFCH transmissions that meet conditions for utilizing a shared COT.

[0144] In a second aspect, alone or in combination with the first aspect, the PSFCH transmission that meets the conditions for utilizing the shared COT is a first PSFCH transmission among a plurality of scheduled PSFCH transmissions, the first PSFCH transmission being in the shared COT.

[0145] In a third aspect, either alone or in combination with one or more of the first and second aspects, the PSFCH transmission that satisfies the conditions for utilizing the shared COT is the first PSFCH transmission among multiple scheduled PSFCH transmissions, which is in the shared COT and points to the transmitting UE that initiates the shared COT.

[0146] In a fourth aspect, either alone or in combination with one or more of the first to third aspects, the PSFCH transmission that satisfies the conditions for utilizing a shared COT is the last PSFCH transmission among multiple scheduled PSFCH transmissions, which last PSFCH transmission ensures that the selected set of PSFCH transmissions includes at least one PSFCH in each COT set of RBs associated with the shared COT.

[0147] In a fifth aspect, either alone or in combination with one or more of the first to fourth aspects, the PSFCH transmission that satisfies the conditions for utilizing a shared COT is the last PSFCH transmission among multiple PSFCH transmissions, which last PSFCH transmission ensures that the selected set of PSFCH transmissions includes at least one PSFCH in each RB set associated with the shared COT pointing to the transmitting UE initiating the shared COT.

[0148] In a sixth aspect, either alone or in combination with one or more of the first to fifth aspects, the minimum number of PSFCH transmissions to be sent in a PSFCH transmission opportunity is the maximum of: the value of a parameter related to the maximum number of PSFCH transmissions that can be sent in a PSFCH opportunity with a total transmit power not exceeding a maximum transmit power constraint, and a PSFCH index associated with a PSFCH transmission that satisfies the conditions for utilizing a shared COT.

[0149] In a seventh aspect, alone or in combination with one or more of the first to sixth aspects, selecting a set of PSFCH transmissions based at least in part on whether the scheduled PSFCH transmissions are in a shared COT includes: selecting one or more PSFCH transmissions from a first set of scheduled PSFCH transmissions in the shared COT, and then selecting one or more PSFCH transmissions from a second set of scheduled PSFCH transmissions outside the shared COT based at least in part on the number of scheduled PSFCH transmissions associated with PSFCH transmission opportunities having a total transmit power that exceeds a maximum transmit power constraint.

[0150] In an eighth aspect, alone or in combination with one or more of the first to seventh aspects, one or more PSFCH transmissions are selected from a first set of scheduled PSFCH transmissions in a shared COT based on a primary criterion related to information carried in the scheduled PSFCH transmissions and a secondary criterion related to a priority value associated with the scheduled PSFCH transmissions.

[0151] In a ninth aspect, alone or in combination with one or more of aspects one to eight, one or more PSFCH transmissions are selected from a first set of scheduled PSFCH transmissions in a shared COT based on a primary criterion related to a type associated with one or more transmitting UEs intended to receive the scheduled PSFCH transmissions and a secondary criterion related to a priority value associated with the scheduled PSFCH transmissions.

[0152] In a tenth aspect, alone or in combination with one or more of aspects one to nine, wherein selecting one or more PSFCH transmissions from a first set of scheduled PSFCH transmissions in a shared COT comprises selecting a first PSFCH transmission associated with a lowest priority value or earliest time slot within each RB set in the shared COT from a first subset of scheduled PSFCH transmissions in the shared COT and directed to a transmitting UE initiating the shared COT, and then selecting one or more PSFCH transmissions from a remaining subset of the scheduled PSFCH transmissions based on the priority values ​​associated with the scheduled PSFCH transmissions.

[0153] In an eleventh aspect, alone or in combination with one or more of aspects one to ten, one or more PSFCH transmissions are selected from a first set of scheduled PSFCH transmissions in a shared COT based on a primary criterion related to a type associated with one or more transmitting UEs intended to receive the scheduled PSFCH transmissions, a secondary criterion related to information carried in the scheduled PSFCH transmissions, and a tertiary criterion related to a priority value associated with the scheduled PSFCH transmissions.

[0154] In the twelfth aspect, alone or in combination with one or more of the first to eleventh aspects, selecting one or more PSFCH transmissions from a first set of scheduled PSFCH transmissions in a shared COT includes: selecting a first PSFCH transmission associated with the lowest priority value or earliest time slot within each RB set in the shared COT from a first subset of scheduled PSFCH transmissions in the shared COT and directed to a transmitting UE that initiates the shared COT, and then selecting one or more PSFCH transmissions from the remaining subset of scheduled PSFCH transmissions based on primary criteria related to information carried in the scheduled PSFCH transmissions and secondary criteria related to priority values ​​associated with the scheduled PSFCH transmissions.

[0155] In a thirteenth aspect, alone or in combination with one or more of the first to twelfth aspects, one or more PSFCH transmissions are selected from a second set of scheduled PSFCH transmissions outside the shared COT based on a primary criterion related to information carried in the scheduled PSFCH transmissions and a secondary criterion related to a priority value associated with the scheduled PSFCH transmissions.

[0156] In a fourteenth aspect, selecting the group of PSFCH transmissions, alone or in combination with one or more of aspects one to thirteen, comprises selecting a first PSFCH transmission associated with a lowest priority value or earliest time slot within each RB set in the shared COT from a first subset of scheduled PSFCH transmissions in the shared COT, and then selecting one or more PSFCH transmissions from a remaining subset of scheduled PSFCH transmissions according to a priority rule based at least in part on a number of scheduled PSFCH transmissions associated with PSFCH transmission opportunities having a total transmit power exceeding a maximum transmit power constraint.

[0157] In a fifteenth aspect, alone or in combination with one or more of aspects one to fourteen, selecting a set of PSFCH transmissions comprises selecting a first PSFCH transmission associated with a lowest priority value or earliest time slot within each RB set in the shared COT from a first subset of scheduled PSFCH transmissions in the shared COT and directed to a transmitting UE initiating the shared COT, and then selecting one or more PSFCH transmissions from a remaining subset of scheduled PSFCH transmissions according to a priority rule based at least in part on the number of scheduled PSFCH transmissions associated with PSFCH transmission opportunities having a total transmit power exceeding a maximum transmit power constraint.

[0158] In a sixteenth aspect, alone or in combination with one or more of the first to fifteenth aspects, the number of PSFCH transmissions included in the set of PSFCH transmissions does not exceed a maximum number of simultaneous PSFCH transmissions supported by the UE.

[0159] although Figure 10 Example blocks of process 1000 are shown, but in some aspects, process 1000 may include Figure 10 1000. In some embodiments, the process 1000 may include additional blocks, fewer blocks, different blocks, or blocks arranged in a different manner than those depicted in FIG. Additionally or alternatively, two or more blocks of the blocks of process 1000 may be executed in parallel.

[0160] Figure 11 1 is a diagram of an example apparatus 1100 for wireless communication according to the present disclosure. Apparatus 1100 may be a responding UE, or a responding UE may include apparatus 1100. In some aspects, apparatus 1100 includes a receiving component 1102, a sending component 1104, and / or a communication manager 1106, which may communicate with each other (e.g., via one or more buses and / or one or more other components). In some aspects, communication manager 1106 is a communication manager that is configured to communicate with one another. Figure 1 As shown, the device 1100 can communicate with another device 1108, such as a UE or a network node (such as a CU, DU, RU, or base station), using a receiving component 1102 and a sending component 1104.

[0161] In some aspects, the apparatus 1100 may be configured to perform Figure 8 and Figures 9A to 9B Additionally or alternatively, the apparatus 1100 may be configured to perform one or more processes described herein, such as Figure 10 The process 1000. In some aspects, Figure 11 The apparatus 1100 and / or one or more components shown may include a combination of Figure 2 Additionally or alternatively, Figure 11 One or more components shown may be combined in Figure 2 In addition or alternatively, one or more components in the set of components may be implemented at least in part as software stored in a memory. For example, a component (or a portion of a component) may be implemented as instructions or code that are stored in a non-transitory computer-readable medium and can be executed by a controller or processor to perform the function or operation of the component.

[0162] The receiving component 1102 may receive communications, such as reference signals, control information, data communications, or a combination thereof, from the device 1108. The receiving component 1102 may provide the received communications to one or more other components of the device 1100. In some aspects, the receiving component 1102 may perform signal processing (such as filtering, amplification, demodulation, analog-to-digital conversion, demultiplexing, deinterleaving, demapping, equalization, interference cancellation, or decoding, etc.) on the received communications and may provide the processed signals to one or more other components of the device 1100. In some aspects, the receiving component 1102 may include a combination of Figure 2 The described responsive UE may include one or more antennas, modems, demodulators, MIMO detectors, receive processors, controllers / processors, memories, or combinations thereof.

[0163] The transmitting component 1104 may transmit communications, such as reference signals, control information, data communications, or a combination thereof, to the device 1108. In some aspects, one or more other components of the device 1100 may generate communications and may provide the generated communications to the transmitting component 1104 for transmission to the device 1108. In some aspects, the transmitting component 1104 may perform signal processing (such as filtering, amplification, modulation, digital-to-analog conversion, multiplexing, interleaving, mapping, or encoding, etc.) on the generated communications and may transmit the processed signals to the device 1108. In some aspects, the transmitting component 1104 may include a combination of Figure 2 One or more antennas, modems, modulators, transmit MIMO processors, transmit processors, controllers / processors, memories, or combinations thereof, of the described responsive UE. In some aspects, the transmit component 1104 can be co-located with the receive component 1102 in a transceiver.

[0164] The communications manager 1106 can support the operation of the receiving component 1102 and / or the sending component 1104. For example, the communications manager 1106 can receive information associated with configuring the receipt of communications by the receiving component 1102 and / or the sending of communications by the sending component 1104. Additionally or alternatively, the communications manager 1106 can generate and / or provide control information to the receiving component 1102 and / or the sending component 1104 to control the receipt and / or sending of communications.

[0165] Receiving component 1102 may receive a plurality of PSFCH transmissions associated with a PSFCH transmission opportunity on an unlicensed sidelink channel, wherein at least one of the PSFCH transmission opportunities is within a shared COT. Communications manager 1106 may determine a minimum number of PSFCH transmissions to be transmitted in the PSFCH transmission opportunity. Communications manager 1106 may select a set of PSFCH transmissions from the scheduled PSFCH transmissions that includes at least the minimum number of PSFCH transmissions based at least in part on whether the plurality of scheduled PSFCH transmissions associated with the PSFCH transmission opportunity are within the shared COT. Transmitting component 1104 may transmit the selected set of PSFCH transmissions on the unlicensed sidelink channel in the PSFCH transmission opportunity.

[0166] Figure 11 The number and arrangement of components shown in FIG are provided as examples. In practice, there may be Figure 11 Additional components, fewer components, different components, or components arranged differently than those shown in FIG. Figure 11 Two or more components shown in FIG may be implemented in a single component, or Figure 11 A single component shown in may be implemented as multiple distributed components. Additionally or alternatively, Figure 11 The set of component(s) shown in FIG. 1 may be described as being executable by Figure 11 Another collection of components shown in FIG.

[0167] The following provides an overview of some aspects of the disclosure:

[0168] Aspect 1: A method of wireless communication performed by a responding UE, the method comprising: receiving multiple PSSCH transmissions associated with PSFCH transmission opportunities on an unlicensed sidelink channel, wherein at least one PSFCH transmission in the PSFCH transmission opportunities is in a shared COT; determining a minimum number of PSFCH transmissions to be sent in the PSFCH transmission opportunity; selecting a PSFCH transmission set including at least the minimum number of PSFCH transmissions among the scheduled PSFCH transmissions based at least in part on whether the multiple scheduled PSFCH transmissions associated with the PSFCH transmission opportunity are in the shared COT; and sending the selected set of PSFCH transmissions on the unlicensed sidelink channel in the PSFCH transmission opportunity.

[0169] Aspect 2: The method of aspect 1, wherein the minimum number of PSFCH transmissions to be transmitted in the PSFCH transmission opportunity is based at least in part on PSFCH indices associated with PSFCH transmissions that meet the conditions for utilizing the shared COT.

[0170] Aspect 3: The method according to aspect 2, wherein the PSFCH transmission that meets the condition for utilizing the shared COT is the first PSFCH transmission among the multiple scheduled PSFCH transmissions, and the first PSFCH transmission is in the shared COT.

[0171] Aspect 4: The method according to Aspect 2, wherein the PSFCH transmission that meets the conditions for utilizing the shared COT is the first PSFCH transmission among the multiple scheduled PSFCH transmissions, and the first PSFCH transmission is in the shared COT and points to the transmitting UE that initiates the shared COT.

[0172] Aspect 5: A method according to Aspect 2, wherein the PSFCH transmission that meets the conditions for utilizing the shared COT is the last PSFCH transmission among the multiple scheduled PSFCH transmissions, and the last PSFCH transmission ensures that the selected set of PSFCH transmissions includes at least one PSFCH in each RB set associated with the shared COT.

[0173] Aspect 6: A method according to Aspect 2, wherein the PSFCH transmission that meets the conditions for utilizing the shared COT is the last PSFCH transmission among the multiple PSFCH transmissions, and the last PSFCH transmission ensures that the selected set of PSFCH transmissions includes a PSFCH in at least one COT in each RB set associated with the shared COT pointing to the transmitting UE that initiates the shared COT.

[0174] Aspect 7: A method according to Aspect 2, wherein the minimum number of PSFCH transmissions to be sent in the PSFCH transmission opportunity is the maximum of the following: the value of a parameter related to the maximum number of PSFCH transmissions that can be sent in the PSFCH opportunity with a total transmission power not exceeding the maximum transmission power constraint, and the PSFCH index associated with the PSFCH transmission that satisfies the condition for utilizing the shared COT.

[0175] Aspect 8: A method according to any one of Aspects 1 to 7, wherein selecting the set of PSFCH transmissions based at least in part on whether the scheduled PSFCH transmissions are in the shared COT includes: selecting one or more PSFCH transmissions from a first set of scheduled PSFCH transmissions in the shared COT, and then selecting one or more PSFCH transmissions from a second set of scheduled PSFCH transmissions outside the shared COT based at least in part on the number of scheduled PSFCH transmissions associated with the PSFCH transmission opportunities having a total transmit power exceeding a maximum transmit power constraint.

[0176] Aspect 9: A method according to Aspect 8, wherein the one or more PSFCH transmissions are selected from the first set of scheduled PSFCH transmissions in the shared COT based on a primary criterion related to the information carried in the scheduled PSFCH transmission and a secondary criterion related to a priority value associated with the scheduled PSFCH transmission.

[0177] Aspect 10: A method according to Aspect 8, wherein the one or more PSFCH transmissions are selected from the first set of scheduled PSFCH transmissions in the shared COT based on a primary criterion related to a type associated with one or more transmitting UEs intended to receive the scheduled PSFCH transmissions and a secondary criterion related to a priority value associated with the scheduled PSFCH transmissions.

[0178] Aspect 11: A method according to Aspect 8, wherein selecting the one or more PSFCH transmissions from the first set of scheduled PSFCH transmissions in the shared COT includes: selecting a first PSFCH transmission associated with the lowest priority value or earliest time slot within each RB set in the shared COT from a first subset of scheduled PSFCH transmissions in the shared COT and pointing to a transmitting UE that initiates the shared COT, and then selecting one or more PSFCH transmissions from the remaining subset of scheduled PSFCH transmissions based on the priority value associated with the scheduled PSFCH transmissions.

[0179] Aspect 12: A method according to Aspect 8, wherein the one or more PSFCH transmissions are selected from the first set of scheduled PSFCH transmissions in the shared COT based on a primary criterion related to a type associated with one or more transmitting UEs intended to receive the scheduled PSFCH transmissions, a secondary criterion related to information carried in the scheduled PSFCH transmissions, and a tertiary criterion related to a priority value associated with the scheduled PSFCH transmissions.

[0180] Aspect 13: A method according to Aspect 8, wherein selecting the one or more PSFCH transmissions from the first set of scheduled PSFCH transmissions in the shared COT includes: selecting a first PSFCH transmission associated with the lowest priority value or earliest time slot within each RB set in the shared COT from a first subset of scheduled PSFCH transmissions in the shared COT and pointing to a transmitting UE that initiates the shared COT, and then selecting one or more PSFCH transmissions from the remaining subset of scheduled PSFCH transmissions based on a primary criterion related to the information carried in the scheduled PSFCH transmission and a secondary criterion related to the priority value associated with the scheduled PSFCH transmission.

[0181] Aspect 14: A method according to Aspect 8, wherein the one or more PSFCH transmissions are selected from the second set of scheduled PSFCH transmissions outside the shared COT based on a primary criterion related to the information carried in the scheduled PSFCH transmission and a secondary criterion related to the priority value associated with the scheduled PSFCH transmission.

[0182] Aspect 15: A method according to any one of Aspects 1 to 14, wherein selecting the set of PSFCH transmissions includes: selecting a first PSFCH transmission associated with a lowest priority value or earliest time slot within each RB set in the shared COT from a first subset of scheduled PSFCH transmissions in the shared COT, and then selecting one or more PSFCH transmissions from the remaining subset of scheduled PSFCH transmissions according to a priority rule based at least in part on the number of scheduled PSFCH transmissions associated with the PSFCH transmission opportunities having a total transmit power exceeding a maximum transmit power constraint.

[0183] Aspect 16: A method according to any one of Aspects 1 to 15, wherein selecting the set of PSFCH transmissions includes: selecting a first PSFCH transmission associated with the lowest priority value or earliest time slot within each RB set in the shared COT from a first subset of scheduled PSFCH transmissions in the shared COT and directed to a transmitting UE that initiates the shared COT, and then selecting one or more PSFCH transmissions from the remaining subset of scheduled PSFCH transmissions according to a priority rule based at least in part on the number of scheduled PSFCH transmissions associated with the PSFCH transmission opportunities having a total transmit power exceeding a maximum transmit power constraint.

[0184] Aspect 17: The method according to any one of aspects 1 to 16, wherein the number of PSFCH transmissions included in the set of PSFCH transmissions does not exceed the maximum number of simultaneous PSFCH transmissions supported by the UE.

[0185] Aspect 18: An apparatus for wireless communication at a device, the apparatus 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 one or more of the methods described in aspects 1 to 17.

[0186] Aspect 19: A device for wireless communication, the device comprising: a memory; and one or more processors coupled to the memory, the one or more processors configured to perform the method according to one or more of aspects 1 to 17.

[0187] Aspect 20: An apparatus for wireless communication, the apparatus comprising at least one component for performing the method according to one or more of aspects 1 to 17.

[0188] Aspect 21: 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 to 17.

[0189] Aspect 22: 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 one or more of the methods described in aspects 1 to 17.

[0190] While the foregoing disclosure provides illustration and description, it 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 these aspects.

[0191] As used herein, the term "component" is intended to be broadly interpreted as hardware, firmware, or a combination of hardware and software. As used herein, a processor is implemented in hardware, firmware, or a combination of hardware and software. As used herein, the phrase "based on" is intended to be broadly interpreted as "based at least in part on". As used herein, depending on the context, "satisfying a threshold" may refer to a value 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. As used herein, a phrase referring to "at least one of" a list of items refers to any combination of these items (including a single member). As an example, "at least one of a, b, or c" is intended to cover: a, b, c, a+b, a+c, b+c, and a+b+c.

[0192] In addition, as used herein, the article "a" and "a kind of" are intended to include one or more projects, and can be used interchangeably with "one or more". In addition, as used herein, the article "said" is intended to include one or more projects connected with the article "said", and can be used interchangeably with "one or more". In addition, as used herein, the term "set" and "group" are intended to include one or more projects (for example, related projects, unrelated projects, or the combination of related and unrelated projects), and can be used interchangeably with "one or more". If only want to refer to a project, then use phrase "only one" or similar terms. In addition, as used herein, the term "having" and similar terms are intended to be open terms that do not limit the elements (for example, "having" A elements can also have B) that they modify. In addition, as used herein, the term "or" is intended to be inclusive when used in a sequence, and can be used interchangeably with "and / or", unless otherwise explicitly stated (for example, when used in combination with "any one of" or "only one of").

[0193] The various illustrative logics, logic blocks, modules, circuits, and algorithmic processes described in conjunction with the various aspects disclosed herein may be implemented as electronic hardware, computer software, or a combination of both. The interchangeability of hardware and software has been generally described in terms of functionality and exemplified in the various illustrative components, blocks, modules, circuits, and processes described herein. Whether such functionality is implemented in hardware or software depends on the specific application and the design constraints imposed on the overall system.

[0194] The hardware and data processing apparatus for implementing the various illustrative logic components, logic blocks, modules, and circuits described in conjunction with the various aspects disclosed herein may be implemented or executed using a general-purpose single-chip or multi-chip processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic components, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general-purpose processor may be a microprocessor, or any conventional processor, controller, microcontroller, or state machine. A processor may also be implemented as a combination of computing devices, for example, a combination of a DSP and a microprocessor, a plurality of microprocessors, a combination of one or more microprocessors and a DSP core, or any other such configuration. In some aspects, specific processes and methods may be performed by circuits dedicated to a given function.

[0195] In one or more aspects, the functions described may be implemented in hardware, digital electronic circuitry, computer software, firmware, including the structures disclosed in this specification and their structural equivalents, or any combination thereof. Aspects of the subject matter described in this specification may also be implemented as one or more computer programs (such as one or more modules of computer program instructions) encoded on computer storage media for execution by data processing apparatus or to control the operation of the data processing apparatus.

[0196] If implemented in software, the function may be stored as one or more instructions or codes on a computer-readable medium or sent via a computer-readable medium. The process of the method or algorithm disclosed herein may be implemented in a processor-executable software module that may reside on a computer-readable medium. Computer-readable media include both computer storage media and communication media, and communication media include any media that can realize transferring a computer program from one place to another. The storage medium may be any available medium that a computer can access. By way of example and not limitation, such computer-readable media may include RAM, ROM, EEPROM, CD-ROM or other optical disk storage devices, magnetic disk storage devices or other magnetic storage devices, or any other medium that can be used to store the desired program code in the form of an instruction or data structure and that can be accessed by a computer. In addition, any connection may be appropriately referred to as a computer-readable medium. Disks and optical disks as used herein include compact discs (CDs), laser discs, optical discs, digital versatile discs (DVDs), floppy disks and blue-ray discs, wherein disks typically reproduce data magnetically, while optical discs reproduce data optically with lasers. The combination of media described herein should also be included within the scope of computer-readable media. Additionally, the operations of a method or algorithm may reside as a code and instruction set, or any combination of code and instruction sets, on a machine-readable medium or computer-readable medium, which may be incorporated into a computer program product.

[0197] Various modifications to the aspects described in this disclosure may be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other aspects without departing from the spirit or scope of this disclosure. Therefore, the claims are not intended to be limited to the aspects shown herein but are to be accorded the widest scope consistent with this disclosure, the principles and novel features disclosed herein.

[0198] Additionally, one of ordinary skill in the art will readily recognize that the terms "upper" and "lower" are sometimes used for ease of describing the drawings and indicate relative positions corresponding to the orientation of the drawings on a correctly oriented page and may not reflect the correct orientation of any device as implemented.

[0199] Certain features described in this specification in the context of separate aspects may also be implemented in combination in a single aspect. Conversely, various features described in the context of a single aspect may also be implemented in multiple aspects individually or in any suitable subcombination. Furthermore, while features may be described as functioning in certain combinations and even initially claimed as such, one or more features from a claimed combination may in some cases be omitted from that combination, and a claimed combination may be directed to a subcombination or variations of a subcombination.

[0200] Similarly, although operations are depicted in a particular order in the accompanying drawings, this should not be understood as requiring such operations to be performed in the particular order shown or in a sequential order, or to perform all illustrated operations to achieve the desired result. In addition, the accompanying drawings may schematically depict one or more example processes in the form of flow charts. However, other operations not depicted may be incorporated into the schematically illustrated example processes. For example, one or more additional operations may be performed before, after, simultaneously with, or between any of the illustrated operations. In certain environments, multitasking and parallel processing are advantageous. In addition, the separation of various system components in the various aspects described should not be understood as requiring such separation in all aspects, and it should be understood that the described program components and systems can generally be integrated together in a single software product or packaged into multiple software products. Additionally, other aspects also fall within the scope of the appended claims. In some cases, the actions recited in the claims may be performed in different orders and still achieve the desired result.

Claims

1. A method of wireless communication performed by a responsive user equipment (UE), the method comprising: receiving, on an unlicensed sidelink channel, a plurality of physical sidelink shared channel (PSSCH) transmissions associated with physical sidelink feedback channel (PSFCH) transmission opportunities, wherein at least one of the PSFCH transmission opportunities is in a shared channel occupancy time (COT); determining a minimum number of PSFCH transmissions to be sent in the PSFCH transmission opportunity; selecting a PSFCH transmission set including at least the minimum number of PSFCH transmissions among the scheduled PSFCH transmissions based at least in part on whether a plurality of scheduled PSFCH transmissions associated with the PSFCH transmission opportunity are in the shared COT; as well as The selected PSFCH transmission set is transmitted on the unlicensed sidelink channel in the PSFCH transmission opportunity.

2. The method of claim 1 , wherein the minimum number of PSFCH transmissions to be sent in the PSFCH transmission opportunity is based at least in part on PSFCH indices associated with PSFCH transmissions that meet the conditions for utilizing the shared COT.

3. The method of claim 2, wherein the PSFCH transmission that meets the condition for utilizing the shared COT is a first PSFCH transmission among the plurality of scheduled PSFCH transmissions, the first PSFCH transmission being in the shared COT.

4. The method of claim 2, wherein the PSFCH transmission that satisfies the condition for utilizing the shared COT is a first PSFCH transmission among the multiple scheduled PSFCH transmissions, the first PSFCH transmission being in the shared COT and directed to a transmitting UE that initiates the shared COT.

5. The method of claim 2 , wherein the PSFCH transmission that satisfies the condition for utilizing the shared COT is a last PSFCH transmission among the multiple scheduled PSFCH transmissions, the last PSFCH transmission ensuring that the selected set of PSFCH transmissions includes at least one in-COT PSFCH in each resource block (RB) set associated with the shared COT.

6. The method of claim 2, wherein the PSFCH transmission that satisfies the condition for utilizing the shared COT is the last PSFCH transmission among the multiple PSFCH transmissions, the last PSFCH transmission ensuring that the selected set of PSFCH transmissions includes at least one PSFCH in each resource block (RB) set associated with the shared COT pointing to the transmitting UE initiating the shared COT.

7. The method of claim 2, wherein the minimum number of PSFCH transmissions to be sent in the PSFCH transmission opportunity is the maximum of: the value of a parameter related to the maximum number of PSFCH transmissions that can be transmitted in said PSFCH opportunity with a total transmit power that does not exceed the maximum transmit power constraint, and The PSFCH index associated with the PSFCH transmission that meets the conditions for utilizing the shared COT.

8. The method of claim 1 , wherein selecting the set of PSFCH transmissions based at least in part on whether the scheduled PSFCH transmissions are in the shared COT comprises: One or more PSFCH transmissions are selected from a first set of scheduled PSFCH transmissions in the shared COT, and then one or more PSFCH transmissions are selected from a second set of scheduled PSFCH transmissions outside the shared COT based at least in part on the number of scheduled PSFCH transmissions associated with the PSFCH transmission opportunities having a total transmit power that exceeds a maximum transmit power constraint.

9. The method of claim 8, wherein selecting the one or more PSFCH transmissions from the first set of scheduled PSFCH transmissions in the shared COT is based on a primary criterion related to information carried in the scheduled PSFCH transmissions and a secondary criterion related to a priority value associated with the scheduled PSFCH transmissions.

10. The method of claim 8, wherein selecting the one or more PSFCH transmissions from the first set of scheduled PSFCH transmissions in the shared COT is based on a primary criterion related to a type associated with one or more transmitting UEs intended to receive the scheduled PSFCH transmissions and a secondary criterion related to a priority value associated with the scheduled PSFCH transmissions.

11. The method of claim 8, wherein selecting the one or more PSFCH transmissions from the first set of scheduled PSFCH transmissions in the shared COT comprises: A first PSFCH transmission associated with a lowest priority value or earliest time slot within each set of resource blocks (RBs) in the shared COT is selected from a first subset of scheduled PSFCH transmissions in the shared COT and directed to a transmitting UE initiating the shared COT, and one or more PSFCH transmissions are then selected from a remaining subset of scheduled PSFCH transmissions based on the priority values ​​associated with the scheduled PSFCH transmissions.

12. A method according to claim 8, wherein the one or more PSFCH transmissions are selected from the first set of scheduled PSFCH transmissions in the shared COT based on a primary criterion related to a type associated with one or more transmitting UEs intended to receive the scheduled PSFCH transmissions, a secondary criterion related to information carried in the scheduled PSFCH transmissions, and a tertiary criterion related to a priority value associated with the scheduled PSFCH transmissions.

13. The method of claim 8, wherein selecting the one or more PSFCH transmissions from the first set of scheduled PSFCH transmissions in the shared COT comprises: A first PSFCH transmission associated with a lowest priority value or earliest time slot within each set of resource blocks (RBs) in the shared COT is selected from a first subset of scheduled PSFCH transmissions in the shared COT and directed to a transmitting UE initiating the shared COT, and then one or more PSFCH transmissions are selected from the remaining subset of scheduled PSFCH transmissions based on primary criteria related to information carried in the scheduled PSFCH transmissions and secondary criteria related to priority values ​​associated with the scheduled PSFCH transmissions.

14. The method of claim 8, wherein selecting the one or more PSFCH transmissions from the second set of scheduled PSFCH transmissions outside the shared COT is based on a primary criterion related to information carried in the scheduled PSFCH transmissions and a secondary criterion related to a priority value associated with the scheduled PSFCH transmissions.

15. The method of claim 1 , wherein selecting the set of PSFCH transmissions comprises: A first PSFCH transmission associated with a lowest priority value or earliest time slot within each set of resource blocks (RBs) in the shared COT is selected from a first subset of scheduled PSFCH transmissions in the shared COT, and one or more PSFCH transmissions are then selected from a remaining subset of scheduled PSFCH transmissions according to a priority rule based at least in part on the number of scheduled PSFCH transmissions associated with the PSFCH transmission opportunities having a total transmit power that exceeds a maximum transmit power constraint.

16. The method of claim 1 , wherein selecting the set of PSFCH transmissions comprises: A first PSFCH transmission associated with a lowest priority value or earliest time slot within each set of resource blocks (RBs) in the shared COT is selected from a first subset of scheduled PSFCH transmissions in the shared COT and directed to a transmitting UE initiating the shared COT, and one or more PSFCH transmissions are then selected from a remaining subset of scheduled PSFCH transmissions according to a priority rule based at least in part on the number of scheduled PSFCH transmissions associated with the PSFCH transmission opportunities having a total transmit power exceeding a maximum transmit power constraint.

17. The method of claim 1, wherein the number of PSFCH transmissions included in the set of PSFCH transmissions does not exceed a maximum number of simultaneous PSFCH transmissions supported by the UE.

18. A responsive user equipment (UE) for wireless communication, the responsive user equipment (UE) comprising: Memory; and one or more processors coupled to the memory, the one or more processors configured to: receiving, on an unlicensed sidelink channel, a plurality of physical sidelink shared channel (PSSCH) transmissions associated with physical sidelink feedback channel (PSFCH) transmission opportunities, wherein at least one of the PSFCH transmission opportunities is in a shared channel occupancy time (COT); determining a minimum number of PSFCH transmissions to be sent in the PSFCH transmission opportunity; selecting a set of PSFCH transmissions including at least the minimum number of PSFCH transmissions among the scheduled PSFCH transmissions based at least in part on whether a plurality of scheduled PSFCH transmissions associated with the PSFCH transmission opportunity are in the shared COT; as well as The selected set of PSFCH transmissions is transmitted on the unlicensed sidelink channel in the PSFCH transmission opportunity.

19. The responding UE of claim 18, wherein the minimum number of PSFCH transmissions to be sent in the PSFCH transmission opportunity is based at least in part on PSFCH indices associated with PSFCH transmissions that meet the conditions for utilizing the shared COT.

20. The responding UE of claim 19, wherein the PSFCH transmission that meets the condition for utilizing the shared COT is a first PSFCH transmission among the plurality of scheduled PSFCH transmissions, the first PSFCH transmission being in the shared COT.

21. The responding UE according to claim 19, wherein the PSFCH transmission that meets the condition for utilizing the shared COT is the first PSFCH transmission among the multiple scheduled PSFCH transmissions, and the first PSFCH transmission is in the shared COT and is directed to the transmitting UE that initiates the shared COT.

22. The responding UE of claim 19, wherein the PSFCH transmission that satisfies the condition for utilizing the shared COT is a last PSFCH transmission among the multiple scheduled PSFCH transmissions, the last PSFCH transmission ensuring that the selected set of PSFCH transmissions includes at least one in-COT PSFCH in each resource block (RB) set associated with the shared COT.

23. The responding UE according to claim 19, wherein the PSFCH transmission that meets the condition for utilizing the shared COT is the last PSFCH transmission among the multiple PSFCH transmissions, and the last PSFCH transmission ensures that the selected set of PSFCH transmissions includes at least one PSFCH in each resource block (RB) set associated with the shared COT pointing to the transmitting UE initiating the shared COT.

24. The responding UE of claim 19, wherein the minimum number of PSFCH transmissions to be sent in the PSFCH transmission opportunity is a maximum of: the value of a parameter related to the maximum number of PSFCH transmissions that can be transmitted in said PSFCH opportunity with a total transmit power that does not exceed the maximum transmit power constraint, and The PSFCH index associated with the PSFCH transmission that meets the conditions for utilizing the shared COT.

25. A responding UE according to claim 18, wherein in order to select the set of PSFCH transmissions based at least in part on whether the scheduled PSFCH transmission is in the shared COT, the one or more processors are configured to: select one or more PSFCH transmissions from a first set of scheduled PSFCH transmissions in the shared COT, and then select one or more PSFCH transmissions from a second set of scheduled PSFCH transmissions outside the shared COT based at least in part on the number of scheduled PSFCH transmissions associated with the PSFCH transmission opportunities having a total transmit power that exceeds a maximum transmit power constraint.

26. A responding UE according to claim 18, wherein to select the set of PSFCH transmissions, the one or more processors are configured to: select a first PSFCH transmission associated with a lowest priority value or earliest time slot within each set of resource blocks (RBs) in the shared COT from a first subset of scheduled PSFCH transmissions in the shared COT, and then select one or more PSFCH transmissions from a remaining subset of scheduled PSFCH transmissions according to a priority rule based at least in part on the number of scheduled PSFCH transmissions associated with the PSFCH transmission opportunities having a total transmit power exceeding a maximum transmit power constraint.

27. A responding UE according to claim 18, wherein in order to select the set of PSFCH transmissions, the one or more processors are configured to: select a first PSFCH transmission associated with a lowest priority value or earliest time slot within each resource block (RB) set in the shared COT from a first subset of scheduled PSFCH transmissions in the shared COT and directed to the transmitting UE initiating the shared COT, and then select one or more PSFCH transmissions from the remaining subset of scheduled PSFCH transmissions according to a priority rule based at least in part on the number of scheduled PSFCH transmissions associated with the PSFCH transmission opportunities having a total transmit power exceeding a maximum transmit power constraint.

28. The responding UE of claim 18, wherein the number of PSFCH transmissions included in the set of PSFCH transmissions does not exceed a maximum number of simultaneous PSFCH transmissions supported by the UE.

29. 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 responding user equipment (UE), cause the responding UE to: receiving, on an unlicensed sidelink channel, a plurality of physical sidelink shared channel (PSSCH) transmissions associated with physical sidelink feedback channel (PSFCH) transmission opportunities, wherein at least one of the PSFCH transmission opportunities is in a shared channel occupancy time (COT); determining a minimum number of PSFCH transmissions to be sent in the PSFCH transmission opportunity; selecting a set of PSFCH transmissions including at least the minimum number of PSFCH transmissions among the scheduled PSFCH transmissions based at least in part on whether a plurality of scheduled PSFCH transmissions associated with the PSFCH transmission opportunity are in the shared COT; as well as The selected set of PSFCH transmissions is transmitted on the unlicensed sidelink channel in the PSFCH transmission opportunity.

30. An apparatus for wireless communication, the apparatus comprising: means for receiving, on an unlicensed sidelink channel, a plurality of physical sidelink shared channel (PSSCH) transmissions associated with physical sidelink feedback channel (PSFCH) transmission opportunities, wherein at least one of the PSFCH transmission opportunities is in a shared channel occupancy time (COT); means for determining a minimum number of PSFCH transmissions to be sent in said PSFCH transmission opportunity; means for selecting, among the scheduled PSFCH transmissions, a set of PSFCH transmissions comprising at least the minimum number of PSFCH transmissions based at least in part on whether a plurality of scheduled PSFCH transmissions associated with the PSFCH transmission opportunity are in the shared COT; and Means for transmitting a selected set of PSFCH transmissions on the unlicensed sidelink channel in the PSFCH transmission opportunities.

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