Systems and methods for sidelink resource selection with beamforming

Abstract

A method for wireless communication is disclosed. And the first node determines that the beam failure recovery process, the initial beam pair establishment process or the beam refinement process is completed. Based on the determination, the first node performs a sensing procedure including receiving sidelink control information (SCI) from a third node. Based on the sensing procedure, the first node selects a sidelink grant for a sidelink transmission to a second node, and transmits the sidelink transmission to the second node based on the selected sidelink grant.

Description

[0001] Cross-references

[0002] This patent application claims priority to U.S. patent application No. 17 / 878,772, entitled “SYSTEM AND METHOD FOR SIDELINK RESOURCE SELECTION WITH BEAMFORMING,” filed by Ryu et al. on August 1, 2022, which is assigned to the assignee of this application and is expressly incorporated herein by reference. Background Art

[0003] Aspects of the present disclosure relate generally to wireless communications, and more particularly to techniques and apparatus for sidelink (SL) communications.

[0004] 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 that can support 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, and time division synchronous code division multiple access (TD-SCDMA) systems.

[0005] A wireless communication network may include several nodes, such as a base station (BS) and a user equipment (UE). A BS may support communication of several UEs. A UE may communicate with a BS via a downlink and an uplink. A downlink (or forward link) refers to a communication link from a BS to a UE, and an uplink (or reverse link) refers to a communication link from a UE to a BS. A BS may also be referred to as a Node B, a gNB, an Access Point (AP), a Radio Head, a Transmit Receive Point (TRP), a New Radio (NR) BS, a 5G Node B, etc. In addition, a UE may also be referred to as an access terminal, a terminal, a mobile station, a subscriber unit, a station, etc.

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

[0007] However, as the demand for mobile broadband access and low latency communications continues to increase, further improvements in wireless communications are needed. Preferably, these improvements should apply to LTE and / or NR, and / or also to other access technologies and telecommunication standards that adopt these technologies. Summary of the invention

[0008] In some aspects of the present disclosure, a method for wireless communication is disclosed, the method being performed by a first node such as a UE. The method may include: determining that a beam failure recovery (BFR) process, an initial beam pair establishment process, or a beam refinement process is completed; performing a sensing process based on the determination, wherein the sensing process includes receiving SL control information (SCI) from a third node; selecting a SL grant for a sidelink (SL) transmission to a second node based on the sensing process; and sending the SL transmission to the second node based on the selected SL grant.

[0009] In some aspects of the present disclosure, an apparatus for wireless communication of a first node may include: a component for determining that a beam failure recovery (BFR) process, an initial beam pair establishment process, or a beam refinement process is completed; a component for performing a sensing process based on the determination, wherein the sensing process includes receiving SL control information (SCI) from a third node; a component for selecting a SL grant for a side link (SL) transmission to a second node based on the sensing process; and a component for sending the SL transmission to the second node based on the selected SL grant.

[0010] In some aspects of the present disclosure, an apparatus for wireless communication of a first node may include: a memory; and one or more processors coupled to the memory, the memory and the one or more processors may be configured to: determine that a beam failure recovery (BFR) process, an initial beam pair establishment process, or a beam refinement process is completed; perform a sensing process based on the determination, wherein the sensing process includes receiving SL control information (SCI) from a third node; select a SL grant for a side link (SL) transmission to a second node based on the sensing process; and send the SL transmission to the second node based on the selected SL grant.

[0011] In some aspects of the present disclosure, a non-transitory computer-readable medium may store one or more instructions (e.g., a computer program) for wireless communication. The one or more instructions, when executed by one or more processors (e.g., one or more processors of a first node such as a UE), may cause the one or more processors to: determine that a beam failure recovery (BFR) process, an initial beam pair establishment process, or a beam refinement process is completed; perform a sensing process based on the determination, wherein the sensing process includes receiving SL control information (SCI) from a third node; select a SL grant for a sidelink (SL) transmission to a second node based on the sensing process; and send the SL transmission to the second node based on the selected SL grant.

[0012] Features according to examples of the present disclosure have been outlined quite broadly above. Additional features and advantages will be described below. The concepts and specific examples disclosed can be readily used as a basis for modifying or designing other structures for achieving the same purpose of the present disclosure. Such equivalent constructions do not depart from the scope of the appended claims. The characteristics of the concepts disclosed herein (both their organization and method of operation) and the associated advantages will be better understood from the following description when considered in conjunction with the accompanying drawings. Each of the figures in the accompanying drawings is provided for the purpose of illustration and description and not as a definition of limitations of the claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to understand the above aspects of the present disclosure in detail, a more specific description is provided below with reference to various aspects, some of which are illustrated in the accompanying drawings. However, it should be noted that the accompanying drawings only illustrate certain typical aspects of the present disclosure and are therefore not to be considered as limiting the scope thereof, as the specification may admit other equally effective aspects. The same reference numerals in different drawings may identify the same or similar elements.

[0014] Figure 1 is a block diagram conceptually illustrating an example of a wireless communication network including SL communications according to various aspects of the present disclosure.

[0015] Figure 2is a block diagram conceptually illustrating examples of nodes (such as a BS and a UE) communicating with other nodes (such as other UEs) in a wireless communication network according to aspects of the present disclosure.

[0016] Figure 3 is a block diagram conceptually illustrating an example of a radio frame structure in a wireless communication network according to aspects of the present disclosure.

[0017] Figure 4 is a diagram illustrating full SL channel sensing and SL transmission resource selection according to various aspects of the present disclosure.

[0018] Figure 5 is a diagram illustrating resource reservation for SL transmission of multiple transport blocks (TBs) according to various aspects of the present disclosure.

[0019] Figure 6 is a diagram illustrating periodicity based partial sensing (PBPS) according to aspects of the present disclosure.

[0020] Figure 7 is a diagram illustrating continuous partial sensing (CPS) according to aspects of the present disclosure.

[0021] Fig. 8A An exemplary process flow for creating a non-periodic Mode 2SL transmission grant in accordance with aspects of the present disclosure is illustrated.

[0022] Figure 8B An exemplary process flow for creating a periodic mode 2SL transmission grant in accordance with aspects of the present disclosure is illustrated.

[0023] Fig.9A and Fig. 9B is a block diagram conceptually illustrating an example of SL transmission using beamforming according to aspects of the present disclosure.

[0024] Fig. 9C is a block diagram conceptually illustrating an example of SL transmission using beamforming according to aspects of the present disclosure.

[0025] Fig.10 is a diagram illustrating example processes performed, for example, by a node (such as a Tx UE) according to aspects of the present disclosure. DETAILED DESCRIPTION

[0026] Various aspects of the disclosure are described in more detail below with reference to the accompanying drawings.

[0027] However, the present disclosure can be implemented in many different forms and should not be interpreted as being limited to any specific structure or function given throughout the present disclosure. On the contrary, these aspects are provided so that the present disclosure will be thorough and complete, and the scope of the present disclosure will be fully conveyed to those skilled in the art. Based on the teachings of this article, it should be understood by those skilled in the art that the scope of the present disclosure is intended to cover any aspect of the 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 a device or method practiced using other structures, functional functions, or structures and functionality other than the various aspects of the present disclosure given herein or different from the various aspects of the present disclosure given herein. It should be understood that any aspect of the disclosure disclosed herein can be implemented by one or more elements of the claims. Although specific feature combinations are described below with respect to certain aspects of the present disclosure, it should be understood that in order to achieve the technical advantages of the devices, systems, methods, and computer programs disclosed herein, not all features of the examples discussed must exist. The disclosed aspects can be modified by combining certain features of one aspect with one or more features of other aspects. Those skilled in the art will understand that features, steps, components and / or functional elements of one aspect may be combined with compatible features, steps, components and / or functional elements of any other aspect of the present disclosure.

[0028] Several aspects of the communication system 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, algorithms, etc. (collectively referred to as "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.

[0029] It should be noted that although various aspects are described herein using terms commonly associated with 3G and / or 4G wireless technologies, various aspects of the present disclosure may also be applicable to communication systems based on other generations (such as 5G and beyond, including NR technology and open RAN (O-RAN) technology).

[0030] Figure 11 is a diagram showing a wireless network 100 in which various aspects of the present disclosure may be practiced. The wireless network 100 may be an LTE network, an O-RAN network, a 5G or NR network, etc. The wireless network 100 may include several network nodes, such as BS 110 (shown as BS 110a, BS 110b, BS 110c, and BS 110d), and UE 120 (shown as UE 120a, UE 120b, UE 120c, UE 120d, and UE 120e) and other network entities. A BS is an entity that communicates with a UE and may also be referred to as a base station, NR BS, Node B, gNB, 5G Node B (gNB), access point (AP), transmit receive point (TRP), etc. Each BS may provide communication coverage for a specific geographic area. In 3GPP, the term "cell" may refer to a coverage area of ​​a BS and / or a BS subsystem serving the coverage area, depending on the context in which the term is used.

[0031] A BS may provide communication coverage for a macro cell, a pico cell, a femto cell, and / or another type of cell. A macro cell may cover a relatively large geographic area (e.g., a radius of several kilometers) and may allow unrestricted access by UEs with service subscriptions. A pico cell may cover a relatively small geographic area and may allow unrestricted access by UEs with service subscriptions. A femto cell may cover a relatively small geographic area (e.g., a home) and may allow restricted access by UEs associated with the femto cell (e.g., UEs in a closed subscriber group (CSG)). A BS for a macro cell may be referred to as a macro BS. A BS for a pico cell may be referred to as a pico BS. A BS for a femto cell may be referred to as a femto BS or a home BS. In Figure 1 In the example shown in , BS110a may be a macro BS for macro cell 102a, BS110b may be a pico BS for pico cell 102b, and BS110c may be a femto BS for femto cell 102c. A BS may support one or more (e.g., three) cells. The terms "eNB", "base station", "NR BS", "gNB", "TRP", "AP", "node B", "5G NB", and "cell" may be used interchangeably herein.

[0032] The wireless network 100 may also include a relay station. A relay station is an entity that can receive transmissions of data from an upstream station (e.g., a BS or a UE) and transmit the transmissions of the data to a downstream station (e.g., a UE or a BS). A relay station may also be a UE that can relay transmissions for other UEs. Figure 1In the example shown in , a relay station BS 110d may communicate with a macro BS 110a and a UE 120d to facilitate communication between the BS 110a and the UE 120d. A relay station may also be referred to as a relay BS, a relay base station, a relay, or the like.

[0033] The wireless network 100 may be a heterogeneous network including different types of BSs, such as a macro BS, a pico BS, a femto BS, a relay BS, etc. These different types of BSs may have different transmission power levels, different coverage areas, and different effects on interference in the wireless network 100. For example, a macro BS may have a high transmission power level (e.g., 5 watts to 40 watts), while a pico BS, a femto BS, and a relay BS may have a lower transmission power level (e.g., 0.1 watt to 2 watts).

[0034] The network controller 130 may be coupled to one or more BSs (e.g., a set of BSs) and may provide coordination and control for these BSs. The network controller 130 may communicate with the BSs via backhaul. The BSs may also communicate with each other (e.g., directly or indirectly via wireless or wired backhaul).

[0035] UE 120 (e.g., 120a, 120b, 120c, 120d, 120e, etc.) may be dispersed throughout wireless network 100, and each UE may be stationary or mobile. UE may communicate with one or more BSs in wireless network 100 and may send data (e.g., Figure 1 120a and UE 120e) with another UE (e.g., UE 120a and UE 120e, such as Figure 1 ) for communication, etc.

[0036] In some cases, two or more nodes (e.g., UEs) may communicate with each other using SL transmissions. Applications of such SL communications may include public safety, nearby services, UE-to-network relaying, vehicle-to-everything (V2X) communications, Internet of Everything (IoE) communications, Internet of Things (IoT) communications, mission-critical grids, and / or various other suitable applications. Generally, a SL transmission may refer to a signal transmitted from one node (e.g., UE1) to another node (e.g., UE2) without relaying the transmission through a scheduling entity (e.g., UE or BS), even if a scheduling entity may be involved for scheduling and / or control purposes. In some examples, licensed spectrum may be used to convey SL transmissions (unlike wireless local area networks that may use unlicensed spectrum).

[0037] UE may also be referred to as an access terminal, terminal, mobile station, subscriber unit, station, etc. A UE may be a cellular phone (e.g., a smart phone), a personal digital assistant (PDA), a wireless modem, a wireless communication device, a handheld device, a laptop computer, a cordless phone, a wireless local loop (WLL) station, a tablet device, a camera, a gaming device, a netbook, a smartbook, an ultrabook, a medical device or equipment, a biosensor / device, a wearable device (smart watch, smart clothing, smart glasses, smart wristband, smart jewelry (e.g., smart ring, smart bracelet)), an entertainment device (e.g., a music or video device, or a satellite radio), an in-vehicle component or sensor, a smart meter / sensor, industrial manufacturing equipment, a global positioning system device, or any other suitable device configured to communicate via a wireless medium or a wired medium.

[0038] Some UEs may be considered as machine type communication (MTC) UEs, or evolved or enhanced machine type communication (eMTC) UEs. For example, MTC and eMTC UEs include robots, drones, remote devices, sensors, meters, monitors, location tags, etc. that can communicate with a base station, another device (e.g., a remote device), or some other entity. A wireless node (e.g., UE, BS, etc.) may provide, for example, a connection to a network (e.g., a wide area network such as the Internet or a cellular network) or a connection to a network via a wired or wireless communication link. Some UEs may be considered as Internet of Things (IoT) devices and / or may be implemented as NB-IoT (narrowband Internet of Things) devices. Some UEs may be considered as customer premises equipment (CPE). UE 120 may be included in a housing that houses components of UE 120 (e.g., processor components, memory components, etc.).

[0039] Generally speaking, any number of wireless networks can be deployed in a given geographic area. Each wireless network can support a specific radio access technology (RAT) and can operate on one or more frequencies. RAT can also be referred to as radio technology, air interface, etc. Frequency can also be referred to as carrier, frequency channel, etc. In a given geographic area, each frequency can support a single RAT to avoid interference between wireless networks of different RATs. In some cases, NR or 5G RAT networks can be deployed.

[0040] As described herein, a node (which may be referred to as a node, a network node, a network entity, or a wireless node) may include, may be, or may be included in (e.g., as a component of) a base station (e.g., any base station described herein), a UE (e.g., any UE described herein), a network controller, an apparatus, a device, a computing system, an integrated access and backhaul (IAB) node, a distributed unit (DU), a central unit (CU), a remote / radio unit (RU) (which may also be referred to as a remote radio unit (RRU)), and / or another processing entity configured to perform any of the techniques described herein. For example, the network node may be a UE. For another example, the network node may be a base station or a network entity. For another example, a first network node may be configured to communicate with a second network node or a third network node. In one aspect of this example, the first network node may be a UE, the second network node may be a base station, and the third network node may be a UE. In another aspect of this example, the first network node may be a UE, the second network node may be a base station, and the third network node may be a base station. In yet other aspects of this example, the first network node, the second network node, and the third network node may be different relative to these examples. Similarly, references to UE, base station, device, equipment, computing system, etc. may include disclosure of UE, base station, device, equipment, computing system, etc. as a network node. For example, a disclosure that a UE is configured to receive information from a base station also discloses that a first network node is configured to receive information from a second network node. Consistent with the present disclosure, once a specific example is expanded according to the present disclosure (e.g., a UE is configured to receive information from a base station also discloses that a first network node is configured to receive information from a second network node), a broader example of a narrower example may be interpreted in reverse, but in a broad, open-ended manner. In the above example where a UE is configured to receive information from a base station also discloses that a first network node is configured to receive information from a second network node, the first network node may refer to a first UE configured to receive information, a first base station, a first device, a first device, a first computing system, a first set of one or more components, a first processing entity, etc.; and the second network node may refer to a second UE, a second base station, a second device, a second device, a second computing system, a second set of one or more components, a second processing entity, etc.

[0041] As described herein, different terms may be used in various aspects to describe the communication of information (e.g., any information, signal, etc.). The disclosure of one communication term includes the disclosure of other communication terms. For example, a first network node may be described as being configured to send information to a second network node. In this example and consistent with the present disclosure, when the first network node is configured to send information to the second network node, the first network node may be configured to provide, transmit, output, communicate, or send information to the second network node. Similarly, in this example and consistent with the present disclosure, when the first network node is configured to send information to the second network node, the second network node may be configured to receive, obtain, or decode information provided, transmitted, output, communicated, or sent by the first network node.

[0042] like Figure 1 As shown, UE 120 may include a communication manager 140 (e.g., implemented in hardware or software). As described in more detail elsewhere herein, the communication manager 140 may determine that a BFR process, an initial beam pair establishment process, or a beam refinement process is complete. Expressed in a different way, the communication manager 140 may determine that at least one or more of the BFR process, the initial beam pair establishment process, or the beam refinement process is complete. Based on the determination, the communication manager 140 may perform a sensing process (e.g., see Figure 4 and Figure 5 ), wherein the sensing process may include receiving an SCI from another UE on a SL (e.g., link 150) between a UE 120 (e.g., UE 120a) and another UE 120 (e.g., UE 120e). Based on the sensing process, the communication manager 140 may select a SL grant for a SL transmission to another UE 120 (e.g., UE 120f). For example, such a SL grant may include transmission resources for the SL transmission, and transmission resources for one or more HARQ retransmissions, and an optional transmission periodicity. The communication manager 140 may then send the SL transmission to the other UE 120 based on the selected SL grant. Additionally or alternatively, the communication manager 140 may perform one or more other operations described herein. For example, in some aspects, the sensing process may be performed by the communication manager based on a receive beam configuration of a UE 120 (e.g., UE 120a), wherein the receive beam configuration is determined based on a completed BFR process, a completed initial beam pair establishment process, or a completed beam refinement process.

[0043] As noted above, Figure 1 This is provided as an example only. Other examples may be found in connection with Figure 1 The content described is different.

[0044] Figure 2A block diagram of a design 200 of a node such as a BS 110 and UEs 120 such as 120a and 120e is shown, which may be Figure 1 1. UE 120e may be equipped similarly to UE 120a. BS 110 may be equipped with T antennas 234a through 234t, and UE 120a and UE 120e may be equipped with R antennas 252a through 252r, where in general, T≥1 and R≥1.

[0045] At BS110, the transmit processor 220 may receive data for one or more UEs from the data source 212, select one or more modulation and coding schemes (MCS) for each UE based on a channel quality indicator (CQI) received from the UE, process (e.g., encode and modulate) the data for each UE based on the MCS selected for the UE, and provide data symbols for all UEs. The transmit processor 220 may also process system information (e.g., for semi-static resource partitioning information (SRPI), etc.) and control information (e.g., CQI requests, grants, upper layer signaling, etc.), and provide overhead symbols and control symbols. The transmit processor 220 may also generate reference symbols for reference signals (e.g., cell-specific reference signals (CRS)) and synchronization signals (e.g., primary synchronization signals (PSS) and secondary synchronization signals (SSS)). The transmit (Tx) multiple-input multiple-output (MIMO) processor 230 may perform spatial processing (e.g., pre-coding) on ​​data symbols, control symbols, overhead symbols, and reference symbols, where applicable, and may provide T output symbol streams to T modulators (MOD) 232a to 232t. Each modulator 232 (e.g., 232a to 232t) may process a corresponding output symbol stream (e.g., for OFDM, etc.) to obtain an output sample stream. Each modulator 232 may further process (e.g., convert to analog, amplify, filter, and up-convert) the output sample stream to obtain a downlink signal. The T downlink signals from modulators 232a to 232t may be transmitted via T antennas 234a to 234t, respectively.

[0046] At UE 120a, antennas 252a to 252r may receive downlink signals from base station 110 and / or other base stations, may receive sidelink signals from another UE 120e (e.g., UE 120a may receive SL signals from UE 120e and / or vice versa), and may provide received signals to demodulators (DEMOD) 254a to 254r, respectively. Each demodulator 254 (e.g., 254a to 254r) may condition (e.g., filter, amplify, downconvert, and digitize) the received signal to obtain input samples. Each demodulator 254 may further process the input samples (e.g., for OFDM, etc.) to obtain received symbols. A MIMO detector 256 may obtain received symbols from all R demodulators 254a to 254r, perform MIMO detection on the received symbols (if applicable), and provide detected symbols. The receive processor 258 may process (e.g., demodulate and decode) the detected symbols, provide decoded data for the UE 120a to a data sink 260, and provide decoded control information and system information to the controller / processor 280. The channel processor may identify reference signal received power (RSRP), received signal strength indicator (RSSI), reference signal received quality (RSRQ), channel quality indicator (CQI), etc. In some aspects, one or more components of the UE 120a and / or UE 120e may be included in a housing.

[0047] On the uplink or SL 205, at UE 120a or at UE 120e, 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, CQI, etc.) from a controller / processor 280. The transmit processor 264 may also 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 modulators 254a to 254r (e.g., for DFT-s-OFDM, CP-OFDM, etc.), and sent on the uplink to the base station 110 and / or on the sidelink to another UE 120e. At the base station 110, uplink signals from the UE 120a, UE 120e, and other UEs may be received by antennas 234 (e.g., 234a through 234t), processed by the demodulator 232, detected by the MIMO detector 236 if applicable, and further processed by the receive processor 238 to obtain decoded data and control information transmitted by the UE 120a and / or UE 120e. 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 base station 110 may include a communication unit 244 and communicate with the network controller 130 via the communication unit 244. The network controller 130 may include a communication unit 294, a controller / processor 290, and a memory 292.

[0048] The controller / processor 240 of the base station 110, the controller / processor 280 of the UE 120a, and / or Figure 2 Any other components of the UE 120a may perform one or more techniques associated with SL resource selection using beamforming, as described in more detail elsewhere herein. For example, the controller / processor 280 and / or Figure 2 Any other component of the present invention may for example perform or direct the Figure 5 , Figure 6 , Figure 7 , Figure 8, Figure 9 or Fig.10 Operation of the disclosed methods and / or other methods and processes as described herein. Memories 242 and 282 may store data and program codes for base station 110 and UE 120a, respectively, such as computer programs for SL sensing and resource selection described elsewhere herein. Scheduler 246 may schedule UEs for data transmission on a downlink, uplink, or SL. In some aspects disclosed herein, such as in NR Mode 2 SL, controller / processor 280 may determine, for example, SL grants for SL transmissions to UE 120e based on SL channel sensing and resource selection processes with beamforming as disclosed herein.

[0049] In some aspects, UE 120 (e.g., UE 120a and / or UE 120e) may therefore include components for determining that a BFR process, an initial beam pair establishment process, or a beam refinement process is complete. UE 120 (e.g., UE 120a and / or UE 120e) may also include components for performing a sensing process based on the determination, wherein the sensing process includes receiving an SCI from another UE. UE 120 (e.g., UE 120a and / or UE 120e) may also include: components for selecting a SL grant for a SL transmission to another UE based on the sensing process; and components for sending a SL transmission to another UE based on the selected SL grant. UE 120 (e.g., UE 120a and / or UE 120e) may also include components for performing one or more other operations described herein.

[0050] Similarly, in some aspects, UE 120 (e.g., UE 120a and / or UE 120e) may therefore include a memory and one or more processors coupled to the memory, the memory and the one or more processors may be configured to: determine that a BFR process, an initial beam pair establishment process, or a beam refinement process is complete; perform a sensing process based on the determination, wherein the sensing process includes receiving an SCI from another UE; select a SL grant for a SL transmission to another UE based on the sensing process; and send the SL transmission based on the selected SL grant. The one or more processors and memory of UE 120 (e.g., UE 120a and / or UE 120e) may be further configured to perform one or more other operations described herein.

[0051] As indicated above, Figure 2 This is provided as an example only. Other examples may be found in connection with Figure 2 The content described is different.

[0052] Figure 3 An example radio frame structure 300 is shown for communicating on a SL between UEs in a wireless communication system (e.g., LTE, 5G NR, O-RAN, etc.). The transmission timeline of the SL may be divided into units of radio frames, where t represents time. Each radio frame may have a predetermined duration (e.g., 10 milliseconds (ms)) and may be divided into a plurality of subframes with indices 0 to 2L-1. Each subframe may include two time slots. As an example, each radio frame may be divided into 10 subframes 0 to 9 and 20 time slots with indices 0 to 19. Each time slot may include multiple symbol periods, such as seven symbol periods for a normal cyclic prefix, or six symbol periods for an extended cyclic prefix.

[0053] In some aspects, a UE (e.g., UE 120a, UE 120e, etc.) may transmit one or more SL communications to another UE (e.g., UE 120a, UE 120e, etc.) on the SL in a transmission period that may include one or more time slots included in the frame structure 300. In some aspects, the other UE may receive the one or more SL communications, may generate feedback for one or more sidelink communications, may incorporate the feedback into one or more feedback communications, and may transmit one or more feedback communications to the UE on the sidelink in one or more symbols and / or time slots included in a reporting period in the frame structure 300 configured for the sidelink.

[0054] Although some techniques are described herein in conjunction with frames, subframes, time slots, etc., these techniques may be equally applicable to other types of wireless communication structures, which may be referred to in 5G NR using terms other than "frames," "subframes," "time slots," etc. In some aspects, a wireless communication structure may refer to a periodic, time-bounded communication unit defined by a wireless communication standard and / or protocol.

[0055] As indicated above, Figure 3 These are provided as examples only. Other examples may be relevant to Figure 3 Different than described.

[0056] In some aspects of the present disclosure, there may be multiple deployment scenarios for SL communication depending on the relationship between SL communication and the overlay cellular network. In one aspect, the nodes involved in SL communication (e.g., wireless devices, UEs, etc.) may be under the coverage of an overlay cellular network (e.g., an NR network). The overlay cellular network may control SL communication. For example, the overlay network may schedule SL transmission. In some aspects, such network-scheduled SL operations (sometimes also referred to as in-coverage operations) may sometimes use (or be referred to as) resource allocation mode 1 (e.g., NR mode 1 SL). In the case of in-coverage operations, SL communication may share a carrier frequency with the overlay cellular network. Alternatively, network-scheduled SL communication may occur on a side link specific carrier frequency that is different from the carrier frequency (or multiple carrier frequencies) of the overlay cellular network. On the other hand, the nodes involved in SL communication may not be network-scheduled, for example, may not be within the coverage of the overlay cellular network (sometimes also referred to as out-of-coverage operations). In some aspects, out-of-coverage operations may sometimes use (or be referred to as) resource allocation mode 2 (e.g., NR mode 2 SL). In out-of-coverage operation, decisions regarding SL transmissions may be determined by nodes involved in SL communication (e.g., transmitting devices, Tx UEs, etc.). For example, as discussed elsewhere herein, in out-of-coverage operation, a node may select a SL transmission grant based on a sensing and resource selection process. Such decisions may include selecting a set of transmission resources, such as a set of OFDM resource elements for use in SL transmissions.

[0057] In some aspects of the present disclosure, SL transmission (e.g., NR mode 2 SL transmission) may be based on multiplexing techniques such as OFDM. A node configured for SL transmission may be configured (e.g., pre-configured, statically or dynamically configured by the network) with a pool of SL resources (also referred to as transmission resources). The side link resource pool may define, among other things, the total time / frequency resources available for SL communication. In the time domain, a resource pool may include a set of time slots repeated over a resource pool period (e.g., a resource pool period associated with a resource pool such as in NR). Therefore, in the time domain, a resource pool may be defined by specifying a configurable resource pool period, a configurable set of SL time slots within a resource pool period, and the like. Expressed in a different way, in some aspects, a resource pool may have a time slot-based granularity in the time domain. In the frequency domain, a resource pool may include a set of contiguous subchannels, where a subchannel may be composed of a number of resource blocks (e.g., a number of contiguous resource blocks, e.g., 10, 15, 20, 25, 50, 75, or 100 contiguous resource blocks) and / or a configurable resource pool bandwidth corresponding to the set of contiguous subchannels. In some aspects, a resource pool may be defined by additionally specifying the frequency domain locations of the subchannels of the resource pool.

[0058] In some aspects of the present disclosure, a transmitting node (e.g., a Tx UE) may facilitate a sensing and resource selection process (e.g., of another node (such as a Tx UE)) by providing one or more resource reservation announcements. The resource reservation announcement may provide information (e.g., to other nodes) about which resource set a node (e.g., a nearby Tx UE) has selected for future SL transmissions. For example, in some aspects of the present disclosure, a node may reserve resources, for example, for up to two additional transmissions within a time window corresponding to a number of time slots including a current time slot (e.g., 32 time slots including the current time slot). Each of these future transmissions may have the same bandwidth as the transmission in the current time slot, but may have a different frequency domain location. Information about the reserved resources may be provided in terms of a time offset (e.g., Δt1 and Δt2) and / or a frequency shift (e.g., Δf1 and Δf2), and may be provided as part of a resource reservation within control information (e.g., SCI, such as level 1 SCI in NR). In addition, or alternatively, a node may reserve a periodically occurring set of resources for SL transmissions. Each of such periodically occurring resource sets may have the same structure (bandwidth, frequency shift and / or relative time offset) as the initial transmission and may occur periodically for a period Tp. In some aspects, the period Tp may be in the range of 1 ms up to 900 ms. In some aspects, the set of allowed periods Tp may be configured by a higher layer (e.g., via RRC signaling such as an sl-ResourceReservePeriodList message in NR). In some aspects of the present disclosure, the control information (e.g., SCI) may include one or more of a time resource assignment (TRA) field, a frequency resource assignment (FRA) field, or a resource reservation interval (RRI) field.

[0059] According to one or more aspects of the present disclosure, a node (e.g., UE 120a, 120e, Tx UE) may perform a sensing and resource selection process by which the node may select a set of resources for one or more SL transmissions. Such sensing and resource selection process may be based on resource reservations announced by other devices (e.g., in control information, e.g., based on TRA / FRA / RRI fields in SCI). SL transmissions may be assigned a delay budget, meaning that the SL transmission is expected to be sent within a specific time window. Alternatively or in addition, SL transmissions may be assigned a priority.

[0060] According to an aspect of the present disclosure, a device (eg, UE 120a, 120e, Tx UE, etc.) may perform channel sensing, such as partial sensing or full sensing. Figure 4400 is a diagram illustrating channel sensing and resource selection according to various aspects of the present disclosure. A node (e.g., a Tx UE) may generate (or obtain) a resource selection trigger in a time slot 402 (e.g., SL time slot n) so that the node may decide to perform a sidelink transmission and may need to determine the resources available for such transmission.

[0061] In some aspects, a node may perform a Tx resource (re)selection check that may generate a resource selection trigger. For example, a node may perform a Tx resource (re)selection check to check whether a Tx resource (re)selection process (e.g., based on a sensing process as disclosed herein) should be performed. For example, a node may repeatedly perform a Tx resource (re)selection check, e.g., via a MAC element of the node, until the corresponding SL resource pool is released through RRC signaling, or if the node decides to cancel the creation of a selected sidelink grant corresponding to the transmission of multiple MAC PDUs.

[0062] Determination of resources available for such SL transmissions may be based on SL channel sensing. More specifically, for example, a node may sense (e.g., monitor) a SL channel (e.g., throughout sensing window 404). The node may want to identify available resources for SL transmissions in resource selection window 406. The node may sense / monitor SCIs sent by nearby nodes, where the SCIs may include information about resources that the nearby nodes will use for future sidelink transmissions (e.g., one or more resource reservation announcements).

[0063] For example, Figure 4 As shown in FIG. 4 , UE1 (eg, UE 120a, 120e, Tx UE, node, etc.) may receive SCI1 408 from UE2 in time slot m. UE1 may determine that SCI1 408 indicates a resource reservation interval (RRI). i ) and the sending priority p i In addition, UE1 can prioritize i ,p j To determine the reference signal received power (RSRP) is above the threshold, for example, as a priority for p i ,p j The threshold value of the function Th(p i ,p j ). Priority p j may be associated with the SL transmission that UE1 wants to send. Expressed differently, the determination of the resources available for SL transmission may be based on the RSRP of the received SCI, the priority p of the SL transmission (eg, the transmission of the Tx UE) by UE1, and j , and the priority p indicated by the received SCI i .continue Figure 4, SCI1 may include an RRI indicating future (eg, periodic) SL transmissions using resource 410 i ≠0. Additionally or alternatively, SCI1 may include a TRA / FRA field indicating a future SL transmission in resource 412. In a similar manner, a SL transmission in resource 410 may indicate (e.g., via a TRA / FRA field) a future sidelink transmission in resource 414, such as a potential HARQ retransmission for the SL transmission in resource 410.

[0064] After obtaining a trigger in time slot 402, the node may determine which resources are available for its own SL transmission based on the reservations received from nearby nodes. x,y ) can be defined as a certain number (e.g., L in NR subCH ) (e.g., a set of consecutive subchannels with time slot t in the side link resource pool) y Subchannel x+j in, where j=0, ..., L subCH -1). In some aspects, the quantity L subCH The number of subchannels to be used for sidelink transmissions in a time slot may refer to the number of subchannels to be used for sidelink transmissions in a time slot and may be configured by a higher layer (e.g., via RRC signaling). Taking into account the overlap with the reserved resources 410, the device may determine to selectively exclude resources 416 (e.g., consecutive L resources) from the set of candidate resources (e.g., candidate single-slot resources) within the resource selection window 406. subCH resources, such as resource R in NR x,y ). In a similar manner, the device may determine to exclude any candidate resources from the set of candidate resources (not shown) taking into account overlap with any resources reserved by any nearby UE (determined by the device by sensing / monitoring transmissions / reservations made by nearby UEs).

[0065] The physical (PHY) layer of the device may then provide the medium access control (MAC) layer with a set of available resources (i.e., a set of remaining candidate resources, which may sometimes be referred to as S A ). Thus, the MAC layer may select one or more resources to be used by the SL transmission, and the PHY layer ( Figure 4 (not shown) implements SL sending in the selected one or more resources.

[0066] According to an aspect of the present disclosure, a node may want to send multiple transport blocks (TBs) to another node via SL communication. Figure 55 is a diagram illustrating resource reservation for SL transmission of multiple TBs in accordance with aspects of the present disclosure. In one aspect, a node may send an initial transmission of a first TB in time / frequency resources 502. Using the TRA / FRA field in the SCI associated with this initial transmission of the first transport block, the node may reserve a number of resources (e.g., up to 2 resources, such as R in NR) for future transmissions. x,y ).exist Figure 5 , the SCI for the initial transmission (e.g., Initial Tx) of the first TB in resource 502 reserves resources 504 and resources 506, for example, for retransmissions (e.g., ReTx) of the initial transmission. Resource 504 may involve a minimum time gap relative to resource 502. Similarly, resource 506 may involve a minimum time gap relative to resource 504. In addition, the resources used for transmission (e.g., 502) and corresponding retransmissions (e.g., 504 and 506) may be separated by up to several time slots (e.g., 31 time slots). In one or more aspects of the present disclosure, resources 502, 504, and 506 may be collectively referred to as a time period 508. A time period may include an initial transmission and subsequent retransmissions of the initial transmission.

[0067] In addition, the RRI field in the SCI or the RRI field combined with the TRA / FRA field of the SL transmission can reserve a set of periodic resources for the SL transmission of multiple TBs. For example, the SCI for the initial transmission of the first TB in resource 502 can reserve periodic resources such as resource 510 (in Figure 5 ) or subsequent periodic resources (not shown). A periodic resource (e.g., resource 510) may be used to transmit a subsequent TB in the plurality of TBs after the first TB. For example, an initial transmission (e.g., initial Tx) of the second TB may be transmitted in resource 510. Similarly, a retransmission of the first TB in resource 504 may reserve a periodic resource, such as resource 512 ( Figure 5 ) or subsequent periodic resources (not shown). Periodic resources (e.g., resource 512) may be used to send retransmissions of subsequent TBs. Similarly, the RRI in the SCI of the retransmissions in resource 506 may be reserved to include resource 514 ( Figure 5In addition, the combination of the RRI field of the first transmitted SCI and the TRA / FRA field of the RCI can reserve resources 512 and 514 in the subsequent SL period. In one or more aspects, the periodicity indicated in the RRI can be selected from a set of allowed time periods. For example, the set of allowed time periods can be configured by a higher layer (e.g., via RRC signaling such as an sl-ResourceReservePeriodList message in NR). In other aspects, as an alternative or in addition to the above, the RRI sent by the side link in resource 510 can reserve resources 512 and 514 by using the corresponding TRA / FRA.

[0068] In one or more aspects of the present disclosure, partial sensing may be used to reduce power consumption of a node (e.g., UE 120a, 120e, Tx UE, etc.) compared to the aforementioned full sensing. Figure 4 4 (e.g., during the entire sensing window 404 shown), a node may sense (e.g., monitor) only a portion of the time / frequency resources (e.g., of a channel). To reduce sensing effort, a node may determine a set of candidate time slots (e.g., candidate time slot set Y) in which the node may want to perform sidelink transmissions. Partial sensing may take into account reservation (e.g., announcement) rules for sidelink transmissions (e.g., reservation rules using TRA / FRA and / or RRI in SCI, such as Figure 5 ) and a set of candidate time slots. In various aspects of the present disclosure, partial sensing may include periodic based partial sensing (PBPS) or continuous partial sensing (CPS). For example, according to one or more aspects of the present disclosure, PBPS may be used to determine one or more resources reserved by a nearby node (e.g., Tx UE) that performs periodic transmission (e.g., sidelink transmission) itself. This determination may be based on the RRI in the SCI of the sensed (e.g., monitored and / or received) sidelink transmission (including initial transmission and retransmission). In addition, for example, according to one or more aspects of the present disclosure, CPS may be used to determine one or more resources reserved by a nearby node (e.g., Tx UE) for retransmission. This determination may be based on one or more TRA / FRA in the SCI of the sensed (e.g., monitored and / or received) sidelink transmission (and / or retransmission).

[0069] As described above, according to an aspect of the present disclosure, a node (eg, UE 120a, 120e, Tx UE, etc.) may perform periodicity based partial sensing (PBPS). Figure 6is a diagram illustrating a PBPS 600 according to various aspects of the present disclosure. For example, similar to the case of full sensing, a node may generate (or obtain) a resource selection trigger 602 in a time slot (e.g., SL time slot n). Based on a delay budget, priority, etc. of the sidelink transmission to be sent, and / or based on other considerations, the node may determine a set of candidate time slots 604 (e.g., Y candidate time slots in NR) in which it wants to send the sidelink transmission. However, in PBPS, unlike in full sensing, the node does not perform sensing (e.g., monitoring) of the channel substantially all the time before the resource selection trigger 602. Instead, in PBPS, in order to determine which resources in the set 604 are reserved by nearby nodes (e.g., UEs), the node may sense (e.g., monitor) the channel only on certain time slots before the set 604 based on control information indicated in sidelink transmissions by other nodes (e.g., including one or more of reservation, periodicity, TRA / FRA, RRI, etc.), for example, as Figure 5 described in the context of .

[0070] In one aspect of the present disclosure, in PBPS, a node may perform sensing only in sensing opportunities that have a periodic relationship with the time slots included in set 604. For example, a node may perform sensing in time slot set 606. Time slot set 606 may consist of time slots having a specific time offset from the time slots in candidate time slot set 604. Such an offset may be equal to the periodicity of sidelink transmissions (by nearby nodes) that may be expected by the node, for example, based on various configurations. Such configurations may include a periodicity P reserve , which may be indicated by the nearby nodes in one or more RRIs in the SCI. In some aspects of the present disclosure, the periodicity may only assume a value from a set of allowed periodicities configured by higher layers (e.g., via RRC signaling such as the sl-ResourceReservePeriodList message in NR). Therefore, in order to determine the resources in the candidate set 604 reserved by the nearby nodes, the node may need to check only a few slots before each slot in the candidate set 604 (e.g., with the relationship k×P reserve The node may sense the channel in a set of time slots of time slots, where k is a positive integer). The node may sense the channel in a set of time slots of time slots of time slots, where k is a positive integer. reserve ) to perform such sensing.

[0071] Reference Figure 6In some aspects of the present disclosure, a node may, by default, sense only in one sensing opportunity in the time slot set 606 (i.e., for k=1). In other aspects, a node may alternatively or additionally sense other sensing opportunities, for example, in the time slot set 608 (i.e., for k=2) or in other time slots (i.e., for k≥3, not shown). Similar to the case of full sensing, in PBPS, a node may determine to exclude one or more resources from the candidate time slot set 604, taking into account an overlap with resources reserved for one or more transmissions in the sensing opportunity (e.g., in the time slot set 606 or in the time slot set 608). Moreover, similar to the case of full sensing, the remaining resources in the candidate resource set (e.g., the available resource set S in the NR) may be excluded from the candidate time slot set 604. A ) may then be reported (e.g., by the PHY layer) to the MAC layer of the node. Taking into account the processing time at the PHY layer, in some aspects, the time offset 610 (e.g., ) may exist between the last time slot in the last sensing opportunity (e.g., time slot 606 for k=1) before the candidate time slot set 604 and the time when the candidate resource is reported to the MAC layer. Similarly, taking into account the processing time at the MAC layer, in some aspects, the time offset 612 (e.g., ) may exist between the time when the candidate resources are reported to the MAC layer and the first time slot in the candidate time slot set 604.

[0072] As described above, according to aspects of the present disclosure, a node (eg, UE 120a, 120e, Tx UE, etc.) may perform continuous partial sensing (CPS). Figure 7 is a diagram illustrating a CPS 700 according to various aspects of the present disclosure. For example, similar to the case of full sensing or PBPS, a node may generate (or obtain) a resource selection trigger in a time slot 702 (e.g., SL time slot n). Based on the delay budget, priority, etc. of the sidelink transmission to be sent, and / or based on other considerations, the node may determine a set of candidate time slots 704 (e.g., Y candidate time slots in NR, etc.) in which it typically wants to send sidelink transmissions. However, in CPS, unlike in full sensing and similar to PBPS, the node does not perform sensing (e.g., monitoring) of the channel substantially all the time before time slot 702. Instead, in CPS, in order to determine which resources in the candidate time slot set 704 are reserved by nearby nodes, the node may sense (e.g., monitor) the channel for a consecutive number of time slots based on control information indicated in sidelink transmissions by other nodes (e.g., including one or more reservations, periodicity, TRA / FRA, RRI, etc.), for example, as Figure 5 The frequency resources sensed in CPS are similar to the frequency resources sensed in the above-mentioned full sensing and are defined according to a resource pool (e.g., a resource pool in NR).

[0073] In one aspect of the present disclosure, in CPS, a node may perform sensing only in sensing opportunities associated with a reservation for retransmission. For example, a node may perform sensing in a continuous partial sensing window defined by boundaries 706a and 706b. Boundaries 706a and 706b may be related to control information (e.g., Figure 5 502 and 510 in the context of the resources 502 and 510 in the node. For example, the node may consider that the control information (e.g., SCI) may indicate up to a number of future reservations for retransmissions (e.g., up to 2 future reservations for retransmissions). In one aspect, up to 2 future retransmissions may be at most 31 time slots separated from the control information. In some aspects of the present disclosure, the boundary 706a of the continuous partial sensing window may be determined so that it is located at a number (e.g., 31) of time slots 708 before the first time slot of the candidate time slot 704. The boundary 706a may also be defined relative to the time slot 702 and may be referred to as n+T. A In some aspects of the present disclosure, the boundary 706b of the continuous partial sensing window may be determined so that it is shortly before the first time slot of the candidate time slot 704, but is subject to the processing constraints occurring in time slot 712. The processing constraints in time slot 712 may involve processing time for sensing results and sidelink transmission preparation time, and in some aspects may correspond to the above in Figure 6 Boundary 706b may also be defined relative to time slot 702 and may be referred to as n+T. B Time slot 714 (where n corresponds to time slot 702).

[0074] In one or more aspects of the present disclosure, a node may be configured (e.g., pre-configured), for example, based on a sidelink resource pool, to perform only full sensing, only partial sensing (e.g., PBPS and / or CPS), only random resource selection, or any combination thereof. In some aspects, the resource pool may be a SL mode 2Tx resource pool in NR. PBPS may be used to detect periodic reservations made by nearby nodes (e.g., in control information such as SCI). PBPS may be used based on the configuration of the resource pool (e.g., higher layer parameters, e.g., via RRC signaling, such as sl-MultiReserveResource in NR). CPS may be used to detect non-periodic reservations of nearby nodes (e.g., in control information such as SCI). Partial sensing (PBPS and / or CPS) may be used based on the configuration of the resource pool (e.g., higher layer parameters, e.g., via RRC signaling, such as sl-multiTBReserve in NR). In some aspects, if the node intends to perform non-periodic sidelink transmission using a single TB, the node may perform PBPS and CPS (if reserving multiple resources is enabled in the resource pool, e.g., through higher layer parameters, e.g., through RRC signaling, such as through sl-MultiReserveResource) or only perform CPS (if reserving multiple resources is disabled). In addition, in some aspects, if the node determines to perform periodic sidelink transmission using multiple TBs, the node may perform both PBPS and CPS (if reserving multiple resources is enabled in the resource pool, e.g., through higher layer parameters, e.g., through RRC signaling, such as through sl-MultiReserveResource). In the case where the node performs both PBPS and CPS, the node may combine the sensing results from the PBPS and CPS to determine the available resources (e.g., the set of available resources S in the NR to be reported to the MAC layer). A ).

[0075] According to the above aspects, in full sensing, the resource selection window (e.g., Figure 4 The resource selection window 406 in the resource selection window can be triggered (e.g., Figure 4The resource selection window may end at a time determined by the selection trigger that increases the packet delay budget (PDB) of the TB that the node intends to select resources for its transmission. In some aspects, in full sensing, the node may not know the time (e.g., time slot) in which resource selection may be triggered. Therefore, as described above, the node may perform sensing essentially all the time. In one aspect, the node may obtain knowledge about the PDB (e.g., from a higher layer, such as from a MAC layer and / or from an application layer) at the time the selection trigger is obtained. According to the aspects described above, in partial sensing (e.g., PBPS, CPS), the node may determine a set of candidate time slots 604 or 704 in the resource selection trigger 602 or 702, respectively, based on the PDB associated with the TB that the node intends to select resources for its transmission. In some aspects, in partial sensing, a sensing opportunity (e.g., a set of time slots 606, a set of time slots 608, or a continuous partial sensing window defined by boundaries 706a and 706b) may be located in time between a respective resource selection trigger 602 or 702 and a corresponding set of candidate time slots 604 or 704. Expressed differently, the sensing opportunity and the candidate time slots may not overlap (i.e., may refer to disjoint time slots and / or resources).

[0076] According to the various aspects described above, the sensing method (e.g., full sensing or partial sensing method (e.g., PBPS, CPS)) can be designed for sensing (e.g., monitoring) in channels below 6 GHz (e.g., in FR1 in NR). In one or more aspects of the present disclosure, for example, when operating in a millimeter wave channel (e.g., in FR2 in NR), the sensing (e.g., monitoring) described in the aforementioned method can advantageously use a receive beam. However, the various aspects of the present disclosure are not limited to sensing using millimeter waves (e.g., not limited to using receive beams in millimeter wave channels).

[0077] Beamforming (which may also be referred to as spatial filtering, directional transmission, or directional reception) is a signal processing technique that may be used at a transmitting node or a receiving node (e.g., a base station 110 or a UE 120a, 120b, 120c, 120e) to shape or direct an antenna beam (e.g., a transmit beam or a receive beam) along a spatial path between the transmitting node and the receiving node. Antenna beams (e.g., transmit beams or receive beams) may also be referred to as transmit configuration indicator (TCI) states and / or spatial relationships. Beamforming may be achieved by combining signals communicated via antenna elements of an antenna array so that signals propagating at a particular orientation relative to the antenna array experience constructive interference, while other signals experience destructive interference. Adjustments to signals communicated via antenna elements may include the transmitting node or the receiving node applying a specific amplitude and phase offset to the signal carried via each antenna element associated with the node. The adjustments associated with each of these antenna elements may be defined by a set of beamforming weights associated with a particular direction (e.g., relative to the antenna array of the transmitting node or the receiving node or relative to some other orientation).

[0078] Fig. 8A An exemplary process flow for creating a non-periodic Mode 2 SL transmit grant in accordance with various aspects of the present disclosure is illustrated. At step 810a, a node such as UE 120a, 120e (e.g., the MAC layer of the node) may decide to create a Mode 2 SL transmit grant for sending a single MAC PDU. As will be appreciated by those skilled in the art, the data contained in the PDU may be passed to the MAC layer from a higher layer (e.g., from an application that needs to send data to a receiving node via SL transmission). At step 820a, the node may perform a transmit resource (re)selection check process as explained in detail elsewhere herein. For example, a Tx resource (re)selection check determines whether a Tx resource (re)selection should be performed. Step 820a may be performed to check whether a transmit resource (re)selection should be performed and determine transmit resource selection parameters to the PHY layer, such as a resource pool for resource selection, an L1 priority (e.g., a priority level) and a transmit resource selection parameter. Tx ), remaining PDB, number of subchannels (e.g., L subCH ), etc. For example, the node may determine that a BFR process, an initial beam pair establishment process, or a beam refinement process is completed, and may trigger sensing-based resource (re)selection as described elsewhere herein. For example, additional exemplary conditions for such Tx resource (re)selection checks in the context of 5G NR are listed in Section 5.22.1.2 of 3GPP TS 38.321 V16.7.0. For non-periodic mode 2 SL transmissions, step 830a produces a positive result, and the MAC layer may pass the determined transmission resource selection parameters to the PHY layer and may trigger sensing-based resource (re)selection, as described elsewhere herein.

[0079] At step 840a, the node may select a set of available SL transmission resources (also denoted herein as S ) based on the sensing, for example, via a suitable PHY layer routine. A ), as described elsewhere in this article (see Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 9 or Fig.10 ), for example by excluding the transmission resources reserved for other SL transmissions. Then, the set S A From the PHY layer to the MAC layer, the MAC layer in step 850a based on the set S A To select a set of resources for transmission of the PDU to be transmitted. Based on the selected set of resources for transmission, in step 860a, a new Mode 2SL grant is created for the node and the grant can be used to transmit data.

[0080] Figure 8B An exemplary process flow for creating a periodic Mode 2 SL transmit grant in accordance with various aspects of the present disclosure is illustrated. At step 810b, a node (e.g., a MAC layer of a node) may decide to create a Mode 2 SL transmit grant for transmitting multiple MAC PDUs. As will be appreciated by those skilled in the art, the data contained in the PDU may be passed to the MAC layer from a higher layer (e.g., from an application that needs to transmit data to a receiving UE via SL transmission). At step 820b, the node may perform a transmit resource (re)selection check process as explained in detail elsewhere herein. Step 820b may be performed to check whether a transmit resource (re)selection should be performed and to determine transmit resource selection parameters to the PHY layer, such as a resource pool for resource selection, an L1 priority (e.g., prio 1), and a transmit resource (re)selection check process. Tx ), remaining PDB, number of subchannels (e.g., L subCH ), resource reservation interval (P rsvp_Tx), etc. For example, the node may determine that a BFR process, an initial beam pair establishment process, or a beam refinement process is completed, and may trigger a sensing-based resource (re)selection as described elsewhere herein. For periodic Mode 2 SL transmissions, step 820b may produce a negative result, for example, when the node determines that an already existing Mode 2 SL grant will likely be sufficient for sending data, and at step 822b, the UE uses the already existing grant for sending data, which may have been previously determined via a similar grant creation process. In this case, a previously selected sidelink grant may be reused for several transmissions for multiple MAC PDUs based on a counter initialized by extracting a random number. Step 820b may also produce a positive result, for example, when the UE determines that there is no Mode SL grant, or when the UE determines that an existing grant may be insufficient or not optimal for sending data. In this case, at step 824b, the UE may set a value of a counter that determines for how many SL transmission periods a new SL grant will be used by the UE for periodic SL transmissions. In some aspects, such a value of a counter may be randomly drawn from a preconfigured range or may be preconfigured by the network. At step 830b, the MAC layer may pass the determined transmit resource selection parameters to the PHY layer and may trigger sensing-based resource (re)selection, as described elsewhere herein.

[0081] At step 840b, the UE may select a set of available SL transmission resources (also denoted herein as S ) based on the sensed manner, for example via an appropriate PHY layer routine. A ), as described elsewhere in this article (see Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 9 or Fig.10 ), for example by excluding the transmission resources reserved for other SL transmissions. Then, the set S A From the PHY layer to the MAC layer, the MAC layer in step 850b based on the set S A To select a set of resources for transmission of the PDU to be transmitted. Based on the selected set of resources for transmission, in step 860b, a new Mode 2SL grant is created for the node and the grant can be used to transmit data.

[0082] Fig.9A and Fig. 9Bis a block diagram conceptually illustrating an example of SL transmission using beamforming according to various aspects of the present disclosure. A transmitting node 902 (e.g., UE 120a, 120e, Tx UE, etc.) may determine to use a millimeter wave channel (e.g., a channel in FR2 in NR, e.g., a channel in the 28 GHz band) or some other channel for SL transmission 904 to a receiving node 906 (e.g., UE 120a, 120e, RX UE, etc.). The transmitting node 902 may use beamforming for the SL transmission to the receiving node 906 in order to achieve a favorable signal-to-noise ratio (SNR) at the receiving node 906. The transmitting node 902 may perform beamforming by directing a signal carrying the SL transmission to propagate in a desired direction. In some aspects, the desired direction may be a propagation path from the transmitting device 902 to the receiving device 906 that produces a favorable (e.g., maximum) SNR at the receiving device 906. In one or more aspects of the present disclosure, the pair of devices 902 and 906 may have multiple signal propagation paths. In such cases, depending on the beamforming capabilities, the node pair 902 and 906 may use only a single signal propagation path. For example, in some aspects, the transmitting node 902 may use the transmit beam 908 and the receiving node 906 may use the receive beam 910 ( Fig.9A In other aspects, the transmitting device 902 may use a transmit beam 912 and the receiving device 906 may use a receive beam 914 ( Fig. 9B ). The use of transmit beam 912 and receive beam 914 may involve reflection of side link transmission 904 off reflector 916 (eg, a building, etc.).

[0083] In some aspects, a receiving node (e.g., a node that performs SL sensing and resource selection processes as disclosed elsewhere herein (see Figure 4 and Figure 5 )) may depend on the receive beam configuration used for sensing. Thus, in some aspects, the receive beam configuration used for sensing may affect whether a particular SCI may be correctly received and processed by the receiving node during the sensing window. Furthermore, in some aspects, the receive beam configuration used for sensing may affect the RSRP of the received SCI and, therefore, may affect the SL transmit resource selection process as disclosed elsewhere herein.

[0084] Fig. 9C 9 is a block diagram conceptually illustrating an example of SL transmission using beamforming according to various aspects of the present disclosure. A transmitting node (e.g., Tx UE 902) may communicate with a receiving node (e.g., Rx UE 906) via a SL connection 904 using beamforming. For example, nodes 902 and 906 may have determined a pair of transmit beams 912 and receive beams 914, for example, by performing an initial beam pair establishment procedure or a beam refinement procedure. Fig. 9CAs shown, the optimal SL beam configuration for a pair of nodes may change over time, for example due to the mobility of the nodes or due to a changing signal propagation environment. For example, the reflector 916 (e.g., a reflecting surface) may move away from the nodes 902 and 906 and may therefore no longer be used for beamformed SL transmission on the selected propagation path 904. In response, the nodes 902 and 906 may need to recalibrate their respective transmit beam configurations 912 and receive beam configurations 914. For example, the node 902 or the node 906 may determine to initiate a BFR process or a beam refinement process. In addition, in some cases, it may also be necessary to initiate an initial beam pair establishment process to restore SL communication between the nodes 902 and 906.

[0085] like Fig. 9C As illustrated in , the alternative propagation path 905 (e.g., via the second reflector 917) based on the modified or refined beam configuration of nodes 902 and 906 may be associated with a different interference source than the original signal propagation path 904. For example, other nodes 918 involved in the SL communication (e.g., Tx UE2 with transmit beam configuration 920) may generate an interfering signal. Therefore, in some aspects, the previously assigned or selected SL grant of node 902 may no longer be optimal for the recalibrated beam configuration associated with the alternative propagation path 905. Various aspects of the present disclosure provide efficient and reliable SL transmission and improved SL resource selection in such and similar configurations involving beamforming, thereby reducing interference and improving overall SL network throughput.

[0086] Fig.10 1 is a diagram illustrating an example method 1000 performed by a first node (eg, by UE 120a, UE 120e, etc.) according to aspects of the present disclosure. In some aspects, process 1000 may include Fig.10 The process 1000 may include additional blocks, fewer blocks, different blocks, or blocks arranged in a different manner than the blocks depicted in the process 1000. Additionally or alternatively, two or more of the blocks in the process 1000 may be performed in parallel. For example, the process 1000 may be performed by processing and transmitter circuits of a node based on executing instructions of a computer program stored in a memory.

[0087] like Fig.10 As shown, process 1000 may include determining that a BFR process, an initial beam pair establishment process, or a beam refinement process is complete (block 1010). For example, such a BFR process, an initial beam pair establishment process, or a beam refinement process may be initiated in response to a changing signal propagation environment, such as Fig. 9C exemplified in the example.

[0088] like Fig.10As further shown in, in some aspects, process 1000 may include performing a sensing process based on a determination, wherein the sensing process includes receiving an SCI from a third node (block 1020). In some aspects, the sensing process may be performed based on a receive beam configuration of the first node, wherein the receive beam configuration may be determined based on a completed BFR process, a completed initial beam pair establishment process, or a completed beam refinement process. In some aspects, the SCI may include first information indicating a transmission priority corresponding to a SL transmission of the third node and second information indicating a reserved SL transmission resource corresponding to the SL transmission of the third node, and performing the sensing process may include determining an RSRP corresponding to the SCI, and comparing the RSRP corresponding to the SCI with a threshold, wherein the threshold may be based on the SL transmission priority of the third node. In some aspects, the threshold may be further based on the transmission priority of the SL transmission of the first node.

[0089] In addition, if Fig.10 As shown in , in some aspects, process 1000 may include selecting a SL grant for a SL transmission to a second node based on a sensing process (block 1030). In some aspects, the SL transmission of the first node may include a single transport block, and the SL grant may include transmission resources for the SL transmission, and transmission resources for one or more HARQ retransmissions. In other aspects, the SL transmission may include multiple transport blocks, and the SL grant may include transmission resources for the SL transmission, transmission resources for one or more HARQ retransmissions, and transmission periodicity. In some aspects, selecting the SL grant may include clearing one or more previously selected SL grants (e.g., SL grants selected during a previous sensing window). For example, selecting the SL grant may include clearing one or more previously selected SL grants associated with the SL process associated with the first node and the second node. In addition, selecting the SL grant may also include clearing one or more SL grants associated with a HARQ process or a receiving node associated with the BFR process, the initial beam pair establishment process, or the beam refinement process.

[0090] In addition, if Fig.10As shown, in some aspects, process 1000 may include sending a SL transmission to the second node based on the selected SL grant (block 1040). In some aspects, performing the sensing process may also include: if the RSRP value is greater than the threshold, excluding the reserved SL transmission resources of the third node when selecting the SL grant for the SL transmission; and if the RSRP value is less than or equal to the threshold, including the reserved SL transmission resources of the third node when selecting the SL grant for the SL transmission. In some aspects, the SCI of the third node may be received based on the receive beam configuration of the first node determined via the completed beam BFR process, the initial beam pair establishment process, or the beam refinement process for the first node and the second node. In some aspects, selecting the SL grant may include: determining a set of available transmission resources, wherein determining the set of available transmission resources may include excluding the transmission resources reserved by the third node from the configured set of SL transmission resources based on the sensing process; and selecting the transmission resources for the SL grant from the set of available transmission resources. In addition, selecting the SL grant may include selecting a transmit resource for the SL grant from a set of available transmit resources, wherein the set of available transmit resources excludes transmit resources corresponding to the third node based on the sensing process. In some aspects, the SL transmission of the first node may include a plurality of transmission blocks, and process 1000 may also include determining that a SL grant reselection counter expires, and performing the beam refinement process based on the determination.

[0091] Thus, aspects disclosed herein improve SL resource (re)selection when beamforming is used for SL transmission. For example, aspects of the present disclosure allow a node to perform a threshold and priority-based decision on whether to exclude transmission resources based on SCI received from other nodes during sensing using a recalibrated receive beam configuration. In this way, available system bandwidth can be better used and interference between nodes can be reduced.

[0092] In one or more aspects of the present disclosure, as an alternative or in addition to the aspects described above, a node (eg, UE) may be configured to operate at least in part in accordance with one or more technical specifications (TS) produced by the 3rd Generation Partnership Project (3GPP).

[0093] In the following, several aspects of the present disclosure are presented:

[0094] Aspect 1. A method for wireless communication by a first node, comprising: determining that a beam failure recovery (BFR) process, an initial beam pair establishment process, or a beam refinement process is completed; performing a sensing process based on the determination, wherein the sensing process includes receiving side link (SL) control information (SCI) from a third node; selecting a SL grant for SL transmission to a second node based on the sensing process; and sending the SL transmission to the second node based on the selected SL grant.

[0095] Aspect 2. A method according to aspect 1, wherein the sensing process is performed based on the receiving beam configuration of the first node, wherein the receiving beam configuration is determined based on the completed BFR process, the completed initial beam pair establishment process, or the completed beam refinement process.

[0096] Aspect 3. A method according to any one of Aspects 1 to 2, wherein the SL transmission includes a single transport block, and wherein the SL grant includes: transmission resources for the SL transmission, and transmission resources for one or more HARQ retransmissions.

[0097] Aspect 4. A method according to any one of Aspects 1 to 2, wherein the SL transmission includes multiple transmission blocks, and wherein the SL grant includes: transmission resources for the SL transmission, transmission resources for one or more HARQ retransmissions, and transmission periodicity.

[0098] Aspect 5. The method according to any one of aspects 1 to 4, wherein selecting the SL grant comprises: clearing one or more previously selected SL grants.

[0099] Aspect 6. The method according to aspect 5, wherein selecting the SL grant comprises: clearing one or more previously selected SL grants associated with SL processes associated with the first node and the second node.

[0100] Aspect 7. A method according to aspect 5, wherein selecting the SL grant includes: clearing one or more SL grants associated with a HARQ process or a receiving node associated with the BFR process, the initial beam pair establishment process, or the beam refinement process.

[0101] Aspect 8. A method according to any one of Aspects 1 to 7, wherein the SCI includes first information indicating a transmission priority corresponding to the SL transmission of the third node and second information indicating reserved SL transmission resources corresponding to the SL transmission of the third node, and wherein performing the sensing process also includes: determining a reference signal received power RSRP corresponding to the SCI; and comparing the reference signal received power (RSRP) corresponding to the SCI with a threshold, wherein the threshold is based on the SL transmission priority of the third node.

[0102] Aspect 9. The method according to aspect 8, wherein the threshold is further based on a transmission priority of the SL transmission of the first node.

[0103] Aspect 10. A method according to Aspect 8, wherein performing the sensing process further includes: when the RSRP value is greater than the threshold, excluding the reserved SL sending resources of the third node when selecting the SL grant for the SL sending; and when the RSRP value is less than or equal to the threshold, including the reserved SL sending resources of the third node when selecting the SL grant for the SL sending.

[0104] Aspect 11. A method according to any one of Aspects 2 to 10, wherein the SCI of the third node is received based on the receive beam configuration of the first node determined via the completed beam BFR process, the initial beam pair establishment process, or the beam refinement process for the first node and the second node.

[0105] Aspect 12. A method according to any one of Aspects 1 to 11, wherein selecting the SL grant comprises: determining a set of available sending resources, wherein determining the set of available sending resources comprises excluding the sending resources reserved by the third node from the configured SL sending resource set based on the sensing process; and selecting the sending resources for the SL grant from the set of available sending resources.

[0106] Aspect 13. A method according to any one of Aspects 1 to 12, wherein selecting the SL grant includes selecting a transmission resource for the SL grant from a set of available transmission resources, wherein the set of available transmission resources excludes transmission resources corresponding to the third node based on the sensing process.

[0107] Aspect 14. A method according to any one of aspects 1 to 13, wherein the SL transmission comprises a plurality of transport blocks and the method further comprises: determining that a SL grant reselection counter expires; and performing the beam refinement process based on the determination.

[0108] Aspect 15. An apparatus for wireless communication, the apparatus comprising: a component for determining that a beam failure recovery (BFR) process, an initial beam pair establishment process, or a beam refinement process is completed; a component for performing a sensing process based on the determination, wherein the sensing process includes receiving SL control information (SCI) from a third node; a component for selecting a SL grant for a sidelink (SL) transmission to a second node based on the sensing process; and a component for transmitting the SL transmission to the second node based on the selected SL grant. The apparatus for wireless communication may also include a component for performing the steps described in aspects 2 to 14.

[0109] Aspect 16. A device for wireless communication of a first node, the device comprising: a memory; and one or more processors coupled to the memory, the memory and the one or more processors being configured to: determine that a beam failure recovery (BFR) process, an initial beam pair establishment process, or a beam refinement process is completed; perform a sensing process based on the determination, wherein the sensing process includes receiving SL control information (SCI) from a third node; select a SL grant for a side link (SL) transmission to a second node based on the sensing process; and send the SL transmission to the second node based on the selected SL grant.

[0110] Aspect 17. An apparatus according to Aspect 16, wherein the memory and the one or more processors are further configured to perform the sensing process based on the receive beam configuration of the first node, and determine the receive beam configuration based on the completed BFR process, the completed initial beam pair establishment process, or the completed beam refinement process.

[0111] Aspect 18. An apparatus according to any one of Aspects 16 to 17, wherein the SL transmission comprises a single transport block, and wherein the SL grant comprises: transmission resources for the SL transmission, and transmission resources for one or more HARQ retransmissions.

[0112] Aspect 19. An apparatus according to any one of Aspects 16 to 17, wherein the SL transmission includes multiple transport blocks, and wherein the SL grant includes: transmission resources for the SL transmission, transmission resources for one or more HARQ retransmissions, and transmission periodicity.

[0113] Aspect 20. An apparatus according to any one of Aspects 16 to 19, wherein when the SL grant is selected, the memory and the one or more processors are further configured to: clear one or more previously selected SL grants corresponding to the first node for which the beam failure was detected, for which BFR was performed, for which an initial beam pair was established, or for which beam refinement was performed.

[0114] Aspect 21. An apparatus according to Aspect 20, wherein when the SL grant is selected, the memory and the one or more processors are further configured to: clear one or more previously selected SL grants associated with the SL processes associated with the first node and the second node.

[0115] Aspect 22. An apparatus according to Aspect 20, wherein when the SL grant is selected, the memory and the one or more processors are further configured to: clear one or more SL grants associated with a HARQ process or a receiving node associated with the BFR process, the initial beam pair establishment process, or the beam refinement process.

[0116] Aspect 23. An apparatus according to any one of Aspects 16 to 22, wherein the SCI includes first information indicating a transmission priority corresponding to the SL transmission of the third node and second information indicating reserved SL transmission resources corresponding to the SL transmission of the third node, and wherein when the sensing process is performed, the memory and the one or more processors are further configured to: determine a reference signal received power RSRP corresponding to the SCI; and compare the RSRP corresponding to the SCI with a threshold, wherein the threshold is based on the SL transmission priority of the third node.

[0117] Aspect 24. An apparatus according to any one of Aspects 16 to 23, wherein the memory and the one or more processors are configured to receive the SCI of the third node based on the receive beam configuration of the first node determined via the completed beam BFR process, the initial beam pair establishment process, or the beam refinement process for the first node and the second node.

[0118] Aspect 25. A non-transitory computer readable medium storing one or more instructions for wireless communication, the one or more instructions, when executed by one or more processors, causing the one or more processors to:

[0119] Determine that a BFR process, an initial beam pair establishment process, or a beam refinement process is completed; perform a sensing process based on the determination, wherein the sensing process includes receiving an SCI from a third node; select a SL grant for SL transmission to a second node based on the sensing process; and send the SL transmission to the second node based on the selected SL grant.

[0120] Aspect 26. A non-transitory computer-readable medium according to Aspect 25, wherein the one or more instructions also cause the one or more processors to: perform the sensing process based on the receive beam configuration of the first node; and determine the receive beam configuration based on the completed BFR process, the completed initial beam pair establishment process, or the completed beam refinement process.

[0121] Aspect 27. A non-transitory computer-readable medium according to any one of Aspects 25 to 26, wherein when causing the selection of the SL grant, the one or more instructions are further configured to cause the one or more processors to: clear one or more previously selected SL grants corresponding to the first node for which the beam failure was detected, for which BFR was performed, for which an initial beam pair was established, or for which beam refinement was performed.

[0122] Aspect 28. A non-transitory computer-readable medium according to any one of Aspects 25 to 27, wherein the SCI includes first information indicating a transmission priority corresponding to the SL transmission of the third node and second information indicating reserved SL transmission resources corresponding to the SL transmission of the third node, and wherein when causing the sensing process to be performed, the one or more instructions are further configured to cause the one or more processors to: determine a reference signal received power RSRP corresponding to the SCI; and compare the RSRP corresponding to the SCI with a threshold, wherein the threshold is based on the SL transmission priority of the third node.

[0123] Aspect 29. A non-transitory computer-readable medium according to any one of Aspects 25 to 28, wherein the one or more instructions are further configured to cause the one or more processors to: receive the SCI of the third node based on the receive beam configuration of the first node determined via the completed beam BFR process, the initial beam pair establishment process, or the beam refinement process for the first node and the second node.

[0124] The foregoing disclosure provides illustration and description, but is not intended to be exhaustive or to limit the aspects to the precise forms disclosed. Modifications and variations may be made in light of the above disclosure or may be acquired from practice of these aspects.

[0125] 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.

[0126] It is apparent that the systems and / or methods described herein can be implemented using various forms of hardware, firmware, or a combination of hardware and software. The actual dedicated control hardware or software code used to implement these systems and / or methods does not limit the various aspects. Therefore, the operation and performance of these systems and / or methods are described herein without reference to specific software codes, and it should be understood that software and hardware used to implement these systems and / or methods can be designed based on the description herein.

[0127] Although specific combinations of features are set forth in the claims and / or disclosed in the specification, these combinations are not intended to limit the disclosure of various aspects. In fact, many of these features can be combined in a manner that is not specifically set forth in the claims and / or is not disclosed in the specification. Although each dependent claim listed below may directly rely on only one claim, the disclosure of various aspects includes each dependent claim combined with each other claim in the claim set. The phrase "at least one" mentioned in the list of items refers to any combination of those items, including a single member. As an example, "at least one of a, b or c" is intended to cover: a, b, c, ab, ac, bc, abc, or any combination with multiple identical elements (e.g., aa, aaa, aab, aac, abb, acc, bb, bbb, bbc, cc, ccc, or any other ordering of a, b and c).

[0128] Any element, action or instruction used herein should not be interpreted as critical or essential unless explicitly stated. In addition, as used herein, the articles "a" and "an" are intended to include one or more items and can be used interchangeably with "one or more". In addition, as used herein, the terms "set" and "group" are intended to include one or more items (e.g., related items, unrelated items, combinations of related items and unrelated items, etc.), and can be used interchangeably with "one or more". If only one item is intended to be referred to, the phrase "only one" or similar terms are used. In addition, as used herein, the terms "having" and the like are intended to be open terms.

[0129] As used herein, the phrase "based on" should not be interpreted as referring to a closed set of information, one or more conditions, one or more factors, etc. In other words, the phrase "based on A" (where "A" can be information, a condition, a factor, etc.) should be interpreted as "based at least on A" unless specifically stated differently.

[0130] As used herein, the term "or" is an inclusive "or" unless restrictive language is used with respect to the listed alternatives. For example, references to "X is based on A or B" should be interpreted as including within its scope X based on A, X based on B, and X based on A and B. In this regard, references to "X is based on A or B" refer to "at least one of A or B" or "one or more of A or B" because "or" is inclusive. Similarly, references to "X is based on A, B, or C" should be interpreted as including within its scope X based on A, X based on B, X based on C, X based on A and B, X based on A and C, X based on B and C, and X based on A, B, and C. In this regard, references to "X is based on A, B, or C" refer to "at least one of A, B, or C" or "one or more of A, B, or C" because "or" is inclusive. As an example of limiting language, a reference to “X is based on only one of A or B” should be interpreted to include within its scope X is based on A and X is based on B, but not including X is based on both A and B.

Claims

1. A method for wireless communication by a first node, comprising: Determining that a beam failure recovery (BFR) process, an initial beam pair establishment process, or a beam refinement process is completed; performing a sensing process based on the determining, wherein the sensing process includes receiving side link (SL) control information (SCI) from a third node; selecting a SL grant for SL transmission to a second node based on the sensing process; and The SL transmission is sent to the second node based on the selected SL grant.

2. The method of claim 1, wherein the sensing process is performed based on a receive beam configuration of the first node, wherein the receive beam configuration is determined based on the completed BFR process, the completed initial beam pair establishment process, or the completed beam refinement process.

3. The method of claim 1 , wherein the SL transmission comprises a single transport block, and wherein the SL grant comprises: transmission resources for said SL transmission, and Transmission resources used for one or more HARQ retransmissions.

4. The method of claim 1 , wherein the SL transmission comprises a plurality of transport blocks, and wherein the SL grant comprises: a transmission resource for said SL transmission, transmission resources for one or more HARQ retransmissions, and Send periodically.

5. The method of claim 1 , wherein selecting the SL grant comprises: Clears one or more previously selected SL grants.

6. The method of claim 5, wherein selecting the SL grant comprises: One or more previously selected SL grants associated with SL processes associated with the first node and the second node are cleared.

7. The method of claim 5, wherein selecting the SL grant comprises: One or more SL grants associated with a HARQ process or a receiving node associated with the BFR process, the initial beam pair establishment process, or the beam refinement process are cleared.

8. The method according to claim 1, wherein the SCI includes first information indicating a transmission priority corresponding to the SL transmission of the third node and second information indicating a reserved SL transmission resource corresponding to the SL transmission of the third node, and wherein performing the sensing process further comprises: Determine a reference signal received power RSRP corresponding to the SCI; as well as The RSRP corresponding to the SCI is compared with a threshold value, wherein the threshold value is based on the SL transmission priority of the third node.

9. The method of claim 8, wherein the threshold is further based on a transmission priority of the SL transmission of the first node.

10. The method according to claim 8, wherein performing the sensing process further comprises: In a case where the RSRP value is greater than the threshold, excluding the reserved SL transmission resource of the third node when selecting the SL grant for the SL transmission; and In case the RSRP value is less than or equal to the threshold, then when selecting the SL grant for the SL transmission, the reserved SL transmission resources of the third node are included.

11. The method of claim 2, wherein the SCI of the third node is received based on a receive beam configuration of the first node determined via the completed beam BFR process, the initial beam pair establishment process, or the beam refinement process for the first node and the second node.

12. The method of claim 1 , wherein selecting the SL grant comprises: determining a set of available transmission resources, wherein determining the set of available transmission resources comprises excluding the transmission resources reserved by the third node from the configured set of SL transmission resources based on the sensing process; and A transmission resource for the SL grant is selected from the set of available transmission resources.

13. The method of claim 1, wherein selecting the SL grant comprises selecting a transmit resource for the SL grant from a set of available transmit resources, wherein the set of available transmit resources excludes transmit resources corresponding to the third node based on the sensing process.

14. The method of claim 1, wherein the SL transmission comprises a plurality of transport blocks and the method further comprises: Determining that the SL grant reselection counter expires; as well as The beam refinement process is performed based on the determination.

15. An apparatus for wireless communication of a first node, the apparatus comprising: A component for determining completion of a beam failure recovery (BFR) process, an initial beam pair establishment process, or a beam refinement process; means for performing a sensing process based on the determination, wherein the sensing process comprises receiving SL control information (SCI) from a third node; means for selecting a sidelink (SL) grant for a SL transmission to a second node based on the sensing process; and means for sending the SL transmission to the second node based on the selected SL grant.

16. An apparatus for wireless communication of a first node, the apparatus comprising: Memory; and one or more processors coupled to the memory, the memory and the one or more processors being configured to: Determining that a beam failure recovery (BFR) process, an initial beam pair establishment process, or a beam refinement process is completed; performing a sensing process based on the determining, wherein the sensing process includes receiving SL control information (SCI) from a third node; selecting a sidelink (SL) grant for a SL transmission to a second node based on the sensing process; and The SL transmission is sent to the second node based on the selected SL grant.

17. The apparatus of claim 16, wherein the memory and the one or more processors are further configured to: performing the sensing process based on a receive beam configuration of the first node, and The receive beam configuration is determined based on the completed BFR process, the completed initial beam pair establishment process, or the completed beam refinement process.

18. The apparatus of claim 16, wherein the SL transmission comprises a single transport block, and wherein the SL grant comprises: transmission resources for said SL transmission, and Transmission resources used for one or more HARQ retransmissions.

19. The apparatus of claim 16, wherein the SL transmission comprises a plurality of transport blocks, and wherein the SL grant comprises: a transmission resource for said SL transmission, transmission resources for one or more HARQ retransmissions, and Send periodically.

20. The apparatus of claim 16, wherein when the SL grant is selected, the memory and the one or more processors are further configured to: One or more previously selected SL grants corresponding to the first node for which the beam failure was detected, for which BFR was performed, for which an initial beam pair was established, or for which beam refinement was performed are cleared.

21. The apparatus of claim 21, wherein when the SL grant is selected, the memory and the one or more processors are further configured to: One or more previously selected SL grants associated with SL processes associated with the first node and the second node are cleared.

22. The apparatus of claim 21 , wherein when the SL grant is selected, the memory and the one or more processors are further configured to: One or more SL grants associated with a HARQ process or a receiving node associated with the BFR process, the initial beam pair establishment process, or the beam refinement process are cleared.

23. The apparatus of claim 16, wherein the SCI comprises first information indicating a transmission priority corresponding to the SL transmission of the third node and second information indicating a reserved SL transmission resource corresponding to the SL transmission of the third node, and wherein when performing the sensing process, the memory and the one or more processors are further configured to: determining a reference signal received power RSRP corresponding to the SCI; and The RSRP corresponding to the SCI is compared with a threshold value, wherein the threshold value is based on the SL transmission priority of the third node.

24. The apparatus of claim 16, wherein the memory and the one or more processors are configured to: The SCI of the third node is received based on a receive beam configuration of the first node determined via the completed beam BFR procedure, the initial beam pair establishment procedure, or the beam refinement procedure for the first node and the second node.

25. A non-transitory computer readable medium storing one or more instructions for wireless communication, the one or more instructions, when executed by one or more processors of a wireless communication device of a first node, causes the one or more processors to: Determining that a beam failure recovery (BFR) process, an initial beam pair establishment process, or a beam refinement process is completed; performing a sensing process based on the determining, wherein the sensing process includes receiving SL control information (SCI) from a third node; selecting a sidelink (SL) grant for a SL transmission to a second node based on the sensing process; and The SL transmission is sent to the second node based on the selected SL grant.

26. The non-transitory computer readable medium of claim 25, wherein the one or more instructions further cause the one or more processors to: performing the sensing process based on a receive beam configuration of the first node; and The receive beam configuration is determined based on the completed BFR process, the completed initial beam pair establishment process, or the completed beam refinement process.

27. The non-transitory computer readable medium of claim 25, wherein when causing selection of the SL grant, the one or more instructions are further configured to cause the one or more processors to: One or more previously selected SL grants corresponding to the first node for which the beam failure was detected, for which BFR was performed, for which an initial beam pair was established, or for which beam refinement was performed are cleared.

28. The non-transitory computer-readable medium of claim 25, wherein the SCI comprises first information indicating a transmission priority corresponding to the SL transmission of the third node and second information indicating a reserved SL transmission resource corresponding to the SL transmission of the third node, and wherein when causing execution of the sensing process, the one or more instructions are further configured to cause the one or more processors to: determining a reference signal received power RSRP corresponding to the SCI; and The RSRP corresponding to the SCI is compared with a threshold value, wherein the threshold value is based on the SL transmission priority of the third node.

29. The non-transitory computer readable medium of claim 25, wherein the one or more instructions are further configured to cause the one or more processors to: The SCI of the third node is received based on a receive beam configuration of the first node determined via the completed beam BFR procedure, the initial beam pair establishment procedure, or the beam refinement procedure for the first node and the second node.

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