Listen before talk based resource modification for sidelink communications in unlicensed spectrum and reduced channel occupancy time sharing signaling

Abstract

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) can select a set of resources, within a resource selection window, in which to transmit on an unlicensed sidelink channel. The UE can attempt a listen-before-talk (LBT) procedure to initiate a channel occupancy time in which to transmit on the unlicensed sidelink channel. The UE can adjust the set of resources, in which to transmit on the unlicensed sidelink channel, to be contiguous in at least a time domain, based at least in part on the LBT procedure being successful, within at least a portion of the resource selection window. The UE can transmit on the unlicensed sidelink channel using the set of resources adjusted to be contiguous in at least the time domain. Numerous other aspects are provided.

Description

[0001] Cross-references to related applications

[0002] This patent application claims priority to U.S. non-provisional patent application No. 17 / 103,012, filed November 24, 2020, entitled “LISTEN BEFORE TALK BASEDRESOURCE MODIFICATION AND REDUCED CHANNEL OCCUPANCY TIME SHARING SIGNALINGFOR SIDELINK COMMUNICATION IN UNLICENSED SPECTRUM,” which is expressly incorporated herein by reference.

[0003] background

[0004] Wireless communication systems are widely deployed to provide a variety of telecommunications services such as telephone, video, data, messaging, and broadcasting. Typical wireless communication systems employ multiple access technologies that can support communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power). Examples of such multiple access technologies include Code Division Multiple Access (CDMA) systems, Time Division Multiple Access (TDMA) systems, Frequency Division Multiple Access (FDMA) systems, Orthogonal Frequency Division Multiple Access (OFDMA) systems, Single Carrier Frequency Division Multiple Access (SC-FDMA) systems, Time Division Synchronous Code Division Multiple Access (TD-SCDMA) systems, and Long Term Evolution (LTE). LTE / LTE-Advanced is an enhancement set of the Universal Mobile Telecommunications System (UMTS) mobile standard issued by the 3rd Generation Partnership Project (3GPP).

[0005] A wireless network may include several base stations (BSs) capable of supporting communication between several user equipments (UEs). UEs can communicate with the base stations (BSs) via downlinks and uplinks. A downlink (or forward link) refers to the communication link from the BS to the UE, while an uplink (or reverse link) refers to the communication link from the UE to the BS. As will be described in more detail herein, a BS may be referred to as a B-node, gNB, access point (AP), radio headend, transmit / receive point (TRP), new radio (NR) BS, 5G B-node, etc.

[0006] The multiple access technologies mentioned above have been adopted in various telecommunications standards to provide a common protocol enabling different user equipment to communicate at the city, country, region, and even global levels. New Radio (NR) (also known as 5G) is an enhancement set to the LTE mobile standard issued by the 3rd Generation Partnership Project (3GPP). NR is designed to better support mobile broadband internet access by using Orthogonal Frequency Division Multiplexing (OFDM) with a Cyclic Prefix (CP) (CP-OFDM) on the downlink (DL), and CP-OFDM and / or SC-FDM (e.g., also known as Discrete Fourier Transform Extended OFDM (DFT-s-OFDM)) on the uplink (UL), as well as supporting beamforming, multiple-input multiple-output (MIMO) antenna technologies and carrier aggregation to improve spectral efficiency, reduce costs, improve service, utilize new spectrum, and better integrate with other open standards. Further improvements to LTE, NR, and other radio access technologies remain useful as the demand for mobile broadband access continues to grow.

[0007] Overview

[0008] In some aspects, a method for performing wireless communication by a user equipment (UE) includes: selecting a set of resources to be transmitted on an unlicensed sidelink channel within a resource selection window; attempting a Listen-Before-Talk (LBT) procedure to initiate a Channel Occupancy Time (COT) for the transmission on the unlicensed sidelink channel; adjusting the set of resources to be transmitted on the unlicensed sidelink channel to be contiguous at least in the time domain, based at least in part on the success of the LBT procedure within at least a portion of the resource selection window; and using the resource set adjusted to be contiguous at least in the time domain to transmit on the unlicensed sidelink channel.

[0009] In some aspects, a UE for wireless communication includes a memory; and one or more processors operatively coupled to the memory, the memory and the one or more processors being configured to: select, within a resource selection window, a set of resources to be transmitted on an unlicensed sidelink channel; attempt an LBT procedure to initiate a COT to be transmitted on the unlicensed sidelink channel; adjust the set of resources to be transmitted on the unlicensed sidelink channel to be contiguous at least in the time domain, based at least in part on the success of the LBT procedure within at least a portion of the resource selection window; and use the resource set adjusted to be contiguous at least in the time domain to transmit on the unlicensed sidelink channel.

[0010] In some aspects, a non-transient computer-readable medium storing a set of instructions for wireless communication includes one or more instructions that, when executed by one or more processors of a UE, cause the UE to: select, within a resource selection window, a set of resources in which transmission is to be performed on an unlicensed sidelink channel; attempt an LBT procedure to initiate a COT (Conversion of Operations) in which transmission is to be performed on the unlicensed sidelink channel; adjust the set of resources in which transmission is to be performed on the unlicensed sidelink channel to be contiguous at least in the time domain, based at least in part on the success of the LBT procedure within at least a portion of the resource selection window; and use the resource set adjusted to be contiguous at least in the time domain to perform transmission on the unlicensed sidelink channel.

[0011] In some aspects, an apparatus for wireless communication includes: means for selecting, within a resource selection window, a set of resources to be transmitted on an unlicensed sidelink channel; means for attempting an LBT procedure to initiate a COT to be transmitted on the unlicensed sidelink channel; means for adjusting the set of resources to be transmitted on the unlicensed sidelink channel to be contiguous at least in the time domain, based at least in part on the success of the LBT procedure within at least a portion of the resource selection window; and means for using the set of resources adjusted to be contiguous at least in the time domain to transmit on the unlicensed sidelink channel.

[0012] The aspects generally include, as substantially described herein with reference to the accompanying drawings and description, methods, apparatus, systems, computer program products, non-transient computer-readable media, user equipment, base stations, wireless communication equipment, and / or processing systems.

[0013] The foregoing has broadly outlined the features and technical advantages of the examples according to this disclosure in an effort to facilitate a better understanding of the following detailed description. Additional features and advantages will be described thereafter. The disclosed concepts and specific examples can be readily used as the basis for modifying or designing other structures for implementing the same purposes as this disclosure. Such equivalent constructions do not depart from the scope of the appended claims. The characteristics of the concepts disclosed herein, in both their organization and manner of operation, and their associated advantages, will be better understood by considering the following description in conjunction with the accompanying drawings. Each drawing is provided for illustrative and descriptive purposes and not for defining limitations on the claims. Brief description of the attached diagram

[0015] To gain a more detailed understanding of the features described above in this disclosure, reference can be made to various aspects of the above brief overview, some of which are illustrated in the accompanying drawings. However, it should be noted that the drawings illustrate only certain typical aspects of this disclosure and should not be considered as limiting its scope, as other equivalent aspects are permissible in this description. Identical reference numerals in different drawings may identify the same or similar elements.

[0016] Figure 1 This is a diagram illustrating examples of wireless networks according to various aspects of this disclosure.

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

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

[0019] Figures 4A-4B This is a diagram illustrating an example of channel occupancy time (COT) sharing for sidelink communication in unlicensed spectrum according to various aspects of this disclosure.

[0020] Figure 5 This is a diagram illustrating an example of resource modification based on Listen-Before-Speak (LBT) for sidelink communication in unlicensed spectrum, according to various aspects of this disclosure.

[0021] Figures 6A-6B This is a diagram illustrating an example of reduced COT shared signaling associated with sidelink communication in unlicensed spectrum, according to various aspects of this disclosure.

[0022] Figure 7 This is a diagram illustrating an example process associated with LBT-based resource modification and reduction COT shared signaling for sidelink communication in unlicensed spectrum, according to various aspects of this disclosure.

[0023] Figure 8 This is a block diagram of an example device for wireless communication according to various aspects of this disclosure.

[0024] Detailed description

[0025] The various aspects of this disclosure are described more fully below with reference to the accompanying drawings. However, this disclosure may be implemented in many different forms and should not be construed as being limited to any specific structure or function given throughout this disclosure. Rather, these aspects are provided so that this disclosure will be thorough and complete, and will fully convey the scope of this disclosure to those skilled in the art. Based on the teachings herein, those skilled in the art will appreciate that the scope of this disclosure is intended to cover any aspect of this disclosure disclosed herein, whether implemented independently of or in combination with any other aspect of this disclosure. For example, any number of aspects set forth herein may be used to implement an apparatus or method of practice. Furthermore, the scope of this disclosure is intended to cover such apparatus or methods practiced using additional structures, functionalities, or structures and functionalities that complement or supplement the various aspects of this disclosure set forth herein. It should be understood that any aspect of this disclosure disclosed herein may be implemented by one or more elements of the claims.

[0026] Several aspects of a telecommunications system will now be described with reference to various devices and techniques. These devices and techniques will be described in the following detailed description and explained in the accompanying drawings by various blocks, modules, components, circuits, steps, processes, algorithms, etc. (collectively, "elements"). These elements can be implemented using hardware, software, or a combination thereof. Whether such elements are implemented as hardware or software depends on the specific application and the design constraints imposed on the overall system.

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

[0028] Figure 1 This is a diagram illustrating an example of a wireless network 100 according to various aspects of this disclosure. The wireless network 100 may be a 5G (NR) network and / or an LTE network, etc., or may include elements thereof. The wireless network 100 may include several base stations 110 (shown as BS 110a, BS 110b, BS 110c, and BS 110d) and other network entities. A base station (BS) is an entity that communicates with a user equipment (UE) and may also be referred to as an NR BS, B-node, gNB, 5G B-node (NB), access point, transmit / receive point (TRP), etc. Each BS may provide communication coverage for a specific geographic area. In 3GPP, the term "cell" may refer to the coverage area of ​​a BS and / or the BS subsystem serving that coverage area, depending on the context in which the term is used.

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

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

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

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

[0033] Network controller 130 can be coupled to a set of Base Stations (BSs) and can provide coordination and control over these BSs. Network controller 130 can communicate with each BS via backhaul. These BSs can also communicate with each other directly or indirectly via wireless or wired backhaul.

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

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

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

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

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

[0039] In some aspects, the operating frequency bands used by devices in the wireless network 100 for communication may include operating frequency bands in the licensed radio frequency spectrum and / or operating frequency bands in the unlicensed radio frequency spectrum. For example, base station 110 and UE 120 may use RATs such as Licensed Assisted Access (LAA), Enhanced LAA (eLAA), Further Enhanced LAA (feLAA), MulteFire, and / or NR Unlicensed (NR-U) to communicate in the unlicensed radio frequency spectrum. In some aspects, the operating frequency bands in the unlicensed radio frequency spectrum may be shared by one or more base stations 110, one or more UEs 120, and / or one or more wireless local area network (WLAN) devices (not shown). Because the operating frequency bands in the unlicensed radio frequency spectrum may be shared by devices operating under different protocols (e.g., different RATs), transmitting devices may need to contend for access to the operating frequency bands in the unlicensed radio frequency spectrum before transmitting in the unlicensed radio frequency spectrum.

[0040] For example, in a shared or unlicensed frequency band, a transmitting device may contend for channel access with other devices before transmitting on the shared or unlicensed channel to reduce and / or prevent collisions on that shared or unlicensed channel. To contend for channel access, the transmitting device may execute channel access procedures for shared or unlicensed frequency band channel access, such as the Listen-Before-Talk (LBT) procedure or another suitable channel access procedure. The channel access procedure may be executed to determine whether a physical channel (e.g., the radio resources of that channel) is free to use or busy (e.g., being used by another wireless communication device, such as another UE, IoT device, and / or WLAN device). The channel access procedure may include sensing or measuring the physical channel during a channel access gap (also known as a contention window) (e.g., performing a Reference Signal Received Power (RSRP) measurement, detecting energy levels, or performing another type of measurement), and determining whether the shared or unlicensed channel is idle or busy based at least in part on the signals sensed or measured on the physical channel (e.g., at least in part on whether the measurement meets a threshold). If the transmitting device determines that the channel access procedure is successful, the transmitting device may perform one or more transmissions on a shared or unlicensed channel during the Transmission Opportunity (TXOP), which may extend the Channel Occupancy Time (COT).

[0041] As indicated above, Figure 1 This is provided as an example. Other examples may differ from the one provided. Figure 1 The example described.

[0042] Figure 2 This is a diagram illustrating an example 200 of communication between a base station 110 and a UE 120 in a wireless network 100 according to various aspects of this disclosure. The base station 110 may be equipped with T antennas 234a to 234t, while the UE 120 may be equipped with R antennas 252a to 252r, wherein generally T ≥ 1 and R ≥ 1.

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

[0044] At UE 120, antennas 252a to 252r can receive downlink signals from base station 110 and / or other base stations and can provide the received signals to demodulators (DEMODs) 254a to 254r respectively. Each demodulator 254 can condition (e.g., filter, amplify, downconvert, and digitize) the received signal to obtain an input sample. Each demodulator 254 can further process the input sample (e.g., for OFDM) to obtain received symbols. MIMO detector 256 can obtain the received symbols from all R demodulators 254a to 254r, perform MIMO detection on these received symbols where applicable, and provide detected symbols. Receiver processor 258 can process (e.g., demodulate and decode) these detected symbols, provide decoded data for UE 120 to data sink 260, and provide decoded control information and system information to controller / processor 280. The term "controller / processor" can refer to one or more controllers, one or more processors, or a combination thereof. The channel processor can determine parameters such as Reference Signal Received Power (RSRP), Received Signal Strength Indicator (RSSI), Reference Signal Received Quality (RSRQ), and / or Channel Quality Indicator (CQI). In some respects, one or more components of the UE 120 may be included in the housing 284.

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

[0046] Antennas (e.g., antennas 234a to 234t and / or antennas 252a to 252r) may include, or be included therein, one or more antenna panels, antenna groups, antenna element sets, and / or antenna arrays. Antenna panels, antenna groups, antenna element sets, and / or antenna arrays may include one or more antenna elements. Antenna panels, antenna groups, antenna element sets, and / or antenna arrays may include coplanar antenna element sets and / or non-coplanar antenna element sets. Antenna panels, antenna groups, antenna element sets, and / or antenna arrays may include antenna elements within a single housing and / or multiple antenna elements within housings. Antenna panels, antenna groups, antenna element sets, and / or antenna arrays may include elements coupled to one or more transmission and / or reception components (such as...). Figure 2 One or more antenna elements (one or more components).

[0047] On the uplink, at UE 120, transmit processor 264 can receive and process data from data source 262 and control information from controller / processor 280 (e.g., reports including RSRP, RSSI, RSRQ, and / or CQI). Transmit processor 264 can also generate reference symbols for one or more reference signals. Symbols from transmit processor 264 may be pre-encoded by TX MIMO processor 266 where applicable, further processed by modulators 254a to 254r (e.g., for DFT-s-OFDM or CP-OFDM), and transmitted to base station 110. In some aspects, modulators and demodulators (e.g., MOD / DEMOD 254) of UE 120 may be included in the modem of UE 120. In some aspects, UE 120 includes a transceiver. The transceiver may include any combination of antennas 252, modulators and / or demodulators 254, MIMO detectors 256, receiver processors 258, transmitter processors 264, and / or TX MIMO processors 266. The transceiver may be used by a processor (e.g., controller / processor 280) and memory 282 to perform aspects of any of the methods described herein (e.g., as referenced). Figure 5 , Figures 6A-6B and / or Figure 7 (As described).

[0048] At base station 110, uplink signals from UE 120 and other UEs can be received by antenna 234, processed by demodulator 232, detected by MIMO detector 236 where applicable, and further processed by receiver processor 238 to obtain decoded data and control information transmitted by UE 120. Receiver processor 238 can provide the decoded data to data sink 239 and the decoded control information to controller / processor 240. Base station 110 may include communication unit 244 and communicate with network controller 130 via communication unit 244. Base station 110 may include scheduler 246 to schedule UE 120 for downlink and / or uplink communications. In some aspects, the modulator and demodulator (e.g., MOD / DEMOD 232) of base station 110 may be included in the modem of base station 110. In some aspects, base station 110 includes a transceiver. The transceiver may include (such as) antennas 234, modulators and / or demodulators 232, MIMO detectors 236, receiver processors 238, transmitter processors 220, and / or any combination of TX MIMO processors 230. The transceiver may be used by a processor (e.g., controller / processor 240) and memory 242 to perform aspects of any of the methods described herein (e.g., as referenced). Figure 5 , Figures 6A-6B and / or Figure 7(As described).

[0049] The controller / processor 240 of base station 110, the controller / processor 280 of UE 120, and / or Figure 2 Any other component may perform one or more techniques associated with LBT-based resource modification and reduced COT shared signaling for sidelink communication in unlicensed spectrum, as described in more detail elsewhere herein. For example, the controller / processor 240 of base station 110, the controller / processor 280 of UE 120, and / or Figure 2 Any other component that can execute or direct, for example Figure 7 The operation of process 700 and / or other processes as described herein. Memory 242 and 282 may store data and program code for base station 110 and UE 120, respectively. In some aspects, memory 242 and / or memory 282 may include: a non-transitory computer-readable medium storing one or more instructions (e.g., code and / or program code) for wireless communication. For example, when executed by one or more processors of base station 110 and / or UE 120 (e.g., direct execution, or execution after compilation, transformation, and / or interpretation), the one or more processors, UE 120, and / or base station 110 may cause the one or more processors, UE 120, and / or base station 110 to perform or direct, for example... Figure 7 The operation of process 700 and / or other processes as described herein. In some aspects, the execution instructions may include run instructions, translate instructions, compile instructions, and / or interpret instructions, etc.

[0050] In some aspects, UE 120 includes: means for selecting, within a resource selection window, a set of resources to be transmitted on an unlicensed sidelink channel; means for attempting an LBT procedure to initiate a COT to be transmitted on the unlicensed sidelink channel; means for adjusting the set of resources to be transmitted on the unlicensed sidelink channel to be contiguous at least in the time domain based on the success of the LBT procedure within at least a portion of the resource selection window; and / or means for using the resource set adjusted to be contiguous at least in the time domain to transmit on the unlicensed sidelink channel. Means for UE 120 to perform the operations described herein may include, for example, one or more of antenna 252, demodulator 254, MIMO detector 256, receive processor 258, transmit processor 264, TX MIMO processor 266, modulator 254, controller / processor 280, or memory 282.

[0051] In some aspects, UE 120 includes means for adjusting the set of resources to be transmitted on unlicensed sidelink channels within that portion of the resource selection window to occupy a minimum number of contiguous subchannels in the frequency domain.

[0052] In some aspects, UE 120 includes: means for determining the duration between a successful trigger of an LBT procedure and the earliest resource in that portion of the resource selection window, and / or means for moving the earliest resource in that portion of the resource selection window to an earlier symbol or time slot, at least in part based on the duration satisfying a threshold.

[0053] In some respects, UE 120 includes means for transmitting sidelink control information (SCI) on an unlicensed sidelink channel that indicates non-shared resources within the COT that are reserved for transmission of one or more initial transport blocks.

[0054] In some aspects, UE 120 includes means for adjusting the set of resources to be transmitted on an unlicensed sidelink channel to occupy different subchannels, at least in part based on a frequency hopping mode, within that portion of the resource selection window.

[0055] although Figure 2 The boxes in the diagram are interpreted as different components, but the functions described above with respect to these boxes can be implemented using a single hardware component, software component, or combination of components. For example, the functions described with respect to transmit processor 264, receive processor 258, and / or TX MIMO processor 266 can be performed by controller / processor 280 or under the control of controller / processor 280.

[0056] As indicated above, Figure 2 This is provided as an example. Other examples may differ from the one provided. Figure 2 The example described.

[0057] Figure 3 This is a diagram illustrating example 300 of sidelink communication according to various aspects of this disclosure.

[0058] like Figure 3As shown, the first UE 305-1 can communicate with the second UE 305-2 (and one or more other UEs 305) via one or more sidelink channels 310. UE 305-1 and UE 305-2 can use one or more sidelink channels 310 to communicate for P2P communication, D2D communication, V2X communication (e.g., may include V2V communication, V2I communication, V2P communication, etc.), mesh networking, etc. In some aspects, UE 305 (e.g., UE 305-1 and / or UE 305-2) may correspond to one or more other UEs described elsewhere herein, such as UE 120. In some aspects, the one or more sidelink channels 310 can use a PC5 interface, can operate in a high-frequency band (e.g., the 5.9 GHz band), can operate in an unlicensed or shared band (e.g., the NR unlicensed (NR-U) band), etc. Alternatively or alternatively, UE 305 may use Global Navigation Satellite System (GNSS) timing to synchronize the timing of transmission time intervals (TTIs) (e.g., frames, subframes, time slots, symbols, etc.).

[0059] As in Figure 3 As further shown, the one or more sidelink channels 310 may include a Physical Sidelink Control Channel (PSCCH) 315, a Physical Sidelink Shared Channel (PSSCH) 320, and / or a Physical Sidelink Feedback Channel (PSFCH) 325. PSCCH 315 can be used to convey control information, similar to the Physical Downlink Control Channel (PDCCH) and / or Physical Uplink Control Channel (PUCCH) used for cellular communication with base station 110 via an access link or access channel. PSSCH 320 can be used to convey data, similar to the Physical Downlink Shared Channel (PDSCH) and / or Physical Uplink Shared Channel (PUSCH) used for cellular communication with base station 110 via an access link or access channel.

[0060] In some aspects, PSSCH 315 may carry an SCI that indicates various control information for sidelink communication. For example, in some aspects, the SCI may include a phase one SCI (SCI-1) 330, which may include indications of one or more resources (e.g., time resources, frequency resources, spatial resources, etc.) (where various types of information may be carried on PSSCH 320), information for decoding sidelink communication on PSSCH 320, Quality of Service (QoS) priority values, resource reservation periods, PSSCH demodulation reference signal (DMRS) mode, SCI format and β offset of phase two sidelink control information (SCI-2) 335 transmitted on PSSCH 320, number of PSSCH DMRS ports, modulation and coding scheme (MCS), and so on.

[0061] In some respects, the information carried on PSSCH 320 may include SCI-2 335 and / or data 340. SCI-2 335 may include various types of information, such as Hybrid Automatic Repeat Request (HARQ) procedure ID, New Data Indicator (NDI) associated with data 340 carried on PSSCH 320, source identifier, destination identifier, Channel State Information (CSI) report trigger, etc. In some respects, UE 305 may transmit SCI-1 330 and SCI-2 335. In some respects, UE 305 may transmit only SCI-1 330, in which case one or more types of information that would originally be transmitted in SCI-2 335 may instead be transmitted in SCI-1 330.

[0062] In some respects, PSFCH 325 can be used to communicate sidelink feedback 345, such as HARQ feedback (e.g., ACK / NACK information), transmit power control (TPC), scheduling requests (SR), and so on.

[0063] In some aspects, one or more sidelink channels 310 may use resource pools. For example, specific resource blocks (RBs) may be used across time to transmit scheduling assignments in subchannels (e.g., included in SCI 330). In some aspects, data transmissions associated with scheduling assignments (e.g., on PSSCH 320) may occupy adjacent RBs in the same subframe as the scheduling assignment (e.g., using frequency division multiplexing). In some aspects, scheduling assignments and associated data transmissions are not transmitted on adjacent RBs.

[0064] In some aspects, UE 305 may operate using a transmission mode in which resource selection and / or scheduling is performed by UE 305 (e.g., instead of base station 110). In some aspects, UE 305 may perform resource selection and / or scheduling by sensing channel availability for transmission. For example, UE 305 may measure Received Signal Strength Indicator (RSSI) parameters (e.g., sidelink-RSSI (S-RSSI) parameters) associated with various sidelink channels; may measure Reference Signal Received Power (RSRP) parameters (e.g., PSSCH-RSRP parameters) associated with various sidelink channels; may measure Reference Signal Received Quality (RSRQ) parameters (e.g., PSSCH-RSRQ parameters) associated with various sidelink channels, etc.; and may select channels for transmitting sidelink communications based at least in part on (these) measurements.

[0065] Alternatively or concurrently, UE 305 may use SCI 330 received in PSCCH 315 (which may indicate the resources used, channel parameters, etc.) to perform resource selection and / or scheduling. Alternatively or concurrently, UE 305 may perform resource selection and / or scheduling by determining the Channel Busy Rate (CBR) associated with various sidelink channels, which may be used for rate control (e.g., by indicating the maximum number of resource blocks available to UE 305 for a particular subframe set).

[0066] In a transmission mode where resource selection and / or scheduling is performed by UE 305, UE 305 may generate sidelink grants, and these grants may be transmitted in SCI 330. Sidelink grants may indicate one or more parameters (e.g., transmission parameters) to be used for an upcoming sidelink transmission, such as one or more resource blocks (e.g., for TB 335) to be used for an upcoming sidelink transmission on PSSCH 320, one or more subframes to be used for an upcoming sidelink transmission, modulation and coding scheme (MCS) to be used for an upcoming sidelink transmission, etc. In some aspects, UE 305 may generate sidelink grants indicating one or more parameters for semi-persistent scheduling (SPS), such as the periodicity of sidelink transmissions. Additionally or alternatively, UE 305 may generate sidelink grants for event-driven scheduling (such as for on-demand sidelink messages).

[0067] As indicated above, Figure 3 This is provided as an example. Other examples may differ from the one provided. Figure 3 The example described.

[0068] Figures 4A-4B This is a diagram illustrating example 400 of COT sharing for sidelink communication in unlicensed spectrum according to various aspects of this disclosure.

[0069] For example, to accommodate increasing traffic demands, various efforts have been made to improve spectrum efficiency in wireless networks, thereby increasing network capacity (e.g., through the use of higher-order modulation, advanced MIMO antenna technology, and / or multi-cell coordination techniques). Another potential way to increase network capacity is to expand system bandwidth. However, available spectrum in lower frequency bands that has traditionally been licensed or otherwise allocated to mobile network operators has become very scarce. Accordingly, various technologies have been developed to enable the operation of cellular radio access technologies (RATs) in unlicensed or other shared spectrum. For example, licensed assisted access (LAA) uses carrier aggregation on the downlink to combine LTE in licensed bands with LTE in unlicensed bands (e.g., the 2.4 and / or 5 GHz bands already filled with wireless LAN (WLAN) or “Wi-Fi” devices). In other examples, enhanced LAA (eLAA) and further enhanced LAA (feLAA) technologies implement both uplink and downlink LTE operation in unlicensed spectrum; MulteFire is an LTE-based technology that operates in self-sufficient mode in both unlicensed and shared spectrum; NR-U implements NR operation in unlicensed spectrum, and so on. Generally, one challenge that arises when operating a cellular RAT in unlicensed spectrum (e.g., using LAA, eLAA, feLAA, MulteFire, and / or NR-U) is the need to ensure fair coexistence with existing (e.g., WLAN) systems that can operate in that unlicensed spectrum.

[0070] For example, before gaining access to and / or transmitting on an unlicensed channel, a transmitting device (e.g., base station 110, UE 120, UE 305, etc.) with packets to transmit may need to execute a Level-Blocking (LBT) procedure to contend for access to the unlicensed channel. The LBT procedure typically includes a Clear Channel Assessment (CAA) procedure, which is executed to determine whether the unlicensed channel is available (e.g., not occupied by other transmitting devices). Specifically, the CCA procedure may include detecting the energy level on the unlicensed channel and determining whether that energy level meets (e.g., is less than or equal to) a threshold (sometimes called an energy detection threshold, etc.). When the energy level meets (e.g., is not equal to or exceeds) the threshold, the CCA procedure is considered successful, and the transmitting device can gain access to the unlicensed channel for a duration known as Channel Occupied Time (COT), during which the transmitting device can perform transmissions without performing additional LBT operations. When the energy level does not meet the threshold, the CCA procedure is unsuccessful, and the contention for access to the unlicensed channel may be considered unsuccessful.

[0071] When a CCA procedure results in the unlicensed channel band being determined to be unavailable (e.g., due to an energy level detected on the unlicensed channel indicating that another device is already using the channel), the CCA procedure can be re-executed later. In environments where the transmitting device may lack access to the unlicensed channel (e.g., due to WLAN activity or transmissions by other devices), an extended CCA (eCCA) procedure can be employed to increase the likelihood that the transmitting device will successfully gain access to the unlicensed channel. For example, a transmitting device executing an eCCA procedure can execute a random number of CCA procedures (from 1 to q) based on an eCCA counter. When the transmitting device senses that the channel has become open and / or when the transmitting device senses that the channel has become open, the transmitting device can initiate a random waiting period based on the eCCA counter, and if the channel remains open during that random waiting period, transmission begins.

[0072] Therefore, while wireless networks can be configured to use unlicensed spectrum to achieve faster data rates, provide a more responsive user experience, and offload traffic from licensed spectrum, the need to ensure fair coexistence with existing systems (such as WLAN devices) can hinder the efficient use of unlicensed spectrum. For example, even in the absence of interference, the LBT procedure used to ensure that no other device is already using the channel introduces a delay before transmission can begin, which can degrade the user experience, leading to unacceptable performance for latency-sensitive or time-sensitive applications, and so on. Furthermore, these problems can be exacerbated when the initial CCA procedure fails, as the transmitting device can only transmit on the channel after performing an additional number of CCA procedures and determining that the channel has become open and remaining open for a random waiting period. Additionally, in some cases, the COT obtained by the initiating transmitting device can have a longer duration than necessary for the transmitting device to perform the desired transmission, leading to inefficient use of the unlicensed channel.

[0073] Therefore, in some scenarios, wireless networks can enable the COT (Cost of Access) obtained by the transmitting device to be shared with other nodes to improve access, efficiency, etc., for unlicensed channels. For example, in downlink-to-uplink COT sharing on an access link, the base station can obtain the COT using eCCA (e.g., eCCA), and this COT can be shared with one or more UEs (e.g., UE 120, UE 305, etc.), which can then transmit uplink signals within the COT already obtained by base station 110. In this scenario, a UE attempting to initiate uplink transmission within the COT shared with the base station can perform uplink transmission without having to perform LBT (e.g., Category 1 LBT, also known as no LBT), or the UE can perform uplink transmission after a single CCA with a shorter LBT (e.g., Category 2 LBT when the downlink-to-uplink gap duration is between 16 μs and 25 μs and / or Category 1 LBT when the downlink-to-uplink gap duration is less than or equal to 16 μs).

[0074] Additionally or alternatively, the wireless network may support uplink-to-downlink COT sharing on the access link from the UE to the base station. For example, the UE may execute a Category 4 LBT procedure to initiate a COT (e.g., for configured PUSCH permission or scheduled uplink transmission), which can be shared with the base station via Group Shared Uplink Control Information (GC-UCI) indicating the start point and duration of the remaining portion of the COT to be shared with the base station. For example, the UE may execute a Category 4 LBT procedure to initiate a COT with a duration of 4 milliseconds (ms), and may use only 1 ms of the COT so that the remaining 3 ms can be shared with another device. In this scenario, the base station may need to perform Category 1 or Category 2 LBT sensing using a 16 μs or 25 μs gap before its transmission to obtain the remaining portion of the COT immediately after the UE's last transmission in the earlier (used) portion of the COT. In this manner, a base station can transmit control and / or broadcast signals and / or channels for any UE served by the base station, provided that the transmission includes downlink signals, channels, and / or other transmissions (e.g., PDSCH, PDCCH, reference signals, etc.) intended to be received by the UE initiating COT.

[0075] Additional or alternative grounds allow the wireless network to support UE-to-UE COT sharing on sidelinks. For example, as in Figure 4A As shown by reference numeral 410 in the accompanying drawings, the COT obtained by the initiating UE (e.g., UE 305-1) can be shared with another UE (e.g., UE 305-2) in Frequency Division Multiplexing (FDM) mode by dividing the COT into multiple interleavings (e.g., time periods during which one or more UEs can perform transmission operations). For example, as Figure 4A As shown, the initiating UE can use one or more sidelink resources (e.g., time and frequency resources) to transmit in the first interleaving after the COT has been obtained, and the responding UE can use sidelink frequency resources that do not overlap with the sidelink frequency resources used by the initiating UE to perform transmission operations in subsequent interleavings. Therefore, as Figure 4A As shown, FDM or interleaving-based COT sharing can introduce short transmission gaps between interleavings to allow other UEs to perform transmission operations in subsequent interleavings during COT sharing, and the SCI transmitted by the initiating UE can carry information to support interleaving-based COT sharing. For example, an SCI containing COT sharing information can be considered a COT sharing grant from the initiating UE sharing the COT, and all responding UEs eligible to share the COT (e.g., based on distance metrics, group identifiers, and / or other information) can use that SCI as a COT sharing grant. In this scenario, responding UEs can perform Category 1 or Category 2 LBT procedures before transmission at any time until the end of the COT, and transmission gap restrictions may not apply (e.g., a UE sharing the COT can start transmission anywhere within the shared COT area, even if there is a gap greater than 25 μs between the transmission and the end of the last transmission by the COT initiating UE).

[0076] Additionally or alternatively, as indicated by reference numeral 420, UE-to-UE COT sharing can be enabled in Time Division Multiplexing (TDM) mode. In this case, the total COT can be divided into an initial time period during which the initiating UE can perform a transmission (which may include one or more SCI transmissions, the one or more SCI transmissions including a COT sharing signal indicating when the initial transmission will end), the remaining duration of the COT available for sharing, and so on. Therefore, one or more responding UEs can monitor SCIs transmitted by other UEs (e.g., the initiating UE) to recover COT sharing information that can be used to perform transmissions during the time period corresponding to the shared COT.

[0077] Therefore, as mentioned above, UE-to-UE COT sharing can achieve better access to unlicensed spectrum, more efficient use of unlicensed spectrum, and so on, by enabling multiple UEs to perform transmissions during the COT period obtained by the initiating UE (e.g., a UE that successfully executes the Category 4 LBT procedure to gain access to the unlicensed channel). However, in some situations, using Figure 4A The FDM and / or TDM schemes shown for implementing UE-to-UE COT sharing can be associated with inefficient resource usage. For example, in Figure 4AIn the FDM and TDM schemes shown, the UE initiating a COT typically completes its transmission at the start of the COT and then shares the remaining (unused) portion of the COT with other UEs. As a result, there may be inefficient use of frequency resources in the earlier (used) portions of the COT. For example, the UE initiating the COT may occupy only one or two sub-channels and / or interleavings in the used portion of the COT, meaning other UEs may potentially use sub-channels and / or interleavings not occupied by the COT-initiating UE to perform simultaneous transmissions in the used portion of the COT (e.g., because sidelink UEs are not expected to simultaneously perform unicast transmissions to multiple UEs and therefore do not need to utilize all available frequency resources).

[0078] Therefore, some aspects described herein enable UE-to-UE COT sharing during the used portion of a shared COT (e.g., while the initiating UE is still transmitting). For example, as in Figure 4B As shown by reference numeral 430 in the accompanying drawings, UE-to-UE COT sharing when the COT initiating UE is transmitting can be achieved by dividing the UE-initiated COT into an FDM area where the COT initiating UE reserves a set of time and frequency resources (transmissions reserved for the COT initiating UE) and a TDM area where other UEs sharing the COT can transmit. In this case, as shown by reference numeral 432, the SCI may include COT sharing signals (e.g., COT System Information (COT-SI)) indicating shareable resources in the time and frequency domains. For example, in Figure 4B In the diagram, the shaded rectangle indicates a shareable resource that other UEs can use for transmission without conflicting with non-shareable resources reserved for transmissions by the COT initiating UE.

[0079] While this approach can improve resource utilization within a shared COT by allowing other UEs to concurrently join and transmit on unlicensed channels with the COT initiator UE, COT shared signaling can be associated with significant overhead in cases where shared resources are disjoint and variable across the COT. For example, the UE initiating the COT can select different sub-channels for transmission in different time slots or symbols within the COT to achieve frequency diversity. Furthermore, UEs can use legacy sidelink resource selection algorithms to randomly select sub-channels and / or time slots within a resource selection window, which typically results in highly disjoint shared resources. Therefore, as shown by reference numeral 434, COT shared signaling can have significant overhead in cases where shared resources are disjoint across the shared COT (e.g., because COT shared signaling needs to indicate rectangles corresponding to each set of shared resources in the time and frequency domains and further indicate the TDM area that appears after the COT initiator UE has completed its transmission). The potentially large overhead of COT shared signaling is particularly problematic in sidelink configurations where COT shared signaling can be carried in SCI-1 to achieve reduced processing timelines and power savings. For example, SCI-1 is carried on the PSCCH and has a small payload size to enable decoding by all UEs, and therefore may not be compatible with COT shared signals with large payloads. Furthermore, SCI-2 carried on the PSSCH may not be suitable for carrying COT shared signals because SCI-2 is not decoded by all UEs, and / or some UEs may lack the ability to support SCI-2.

[0080] Some aspects described herein relate to techniques and apparatus for implementing LBT-based resource modification and reduction of COT-shared signaling for sidelink communication in unlicensed spectrum. For example, as described herein, a UE with one or more packets to transmit may initially perform random resource selection within a resource selection window because the UE may not be able to determine, prior to a successful LBT procedure, whether the selected resource will be within a COT initiated by the UE or piggybacked on a shared COT initiated by a different UE. In some aspects, the UE may attempt an LBT procedure (e.g., a Category 4 LBT procedure) and, based on the success of the LBT procedure, may rearrange or otherwise adjust the initially selected resources to be contiguous in the time domain and / or clustered in the frequency domain. In this way, the UE can transmit an SCI including a COT-shared signal to prevent other UEs from performing interfering transmissions in an already used COT area with contiguous and / or clustered transmissions, and adjusting reserved resources to be contiguous in the time domain and / or clustered in the frequency domain can reduce the overhead for signaling notification of shareable resources. For example, the UE initiating a COT may transmit an SCI indicating non-shareable resources (e.g., time and frequency resources reserved for the initial transmission of that UE), and the responding UE may choose to exclude resources other than non-shareable resources for transmission in the used portion of the shared COT. Additionally or alternatively, the UE may select non-shareable resources based on a frequency hopping mode, and the SCI indicating non-shareable resources may include information to enable the responding device to derive the frequency hopping mode used by the COT initiating UE (and thus, the resources to be excluded when selecting resources in the used area of ​​the shared COT).

[0081] As indicated above, Figures 4A-4B This is provided as an example. Other examples may differ from the one provided. Figures 4A-4B The example described.

[0082] Figure 5 This is a diagram illustrating example 500 associated with LBT-based resource modifications for sidelink communication in unlicensed spectrum, according to various aspects of this disclosure.

[0083] For example, as shown by reference numeral 510, the UE can trigger sidelink resource selection in time slot n-T1, where n-T1 is the arrival time of one or more packets corresponding to one or more initial transport blocks, and T1 is the duration between the arrival time of the one or more packets at the UE and the time when the first packet will be transmitted. In some aspects, when the one or more packets arrive at the UE, the UE can determine whether a shared COT is available (e.g., within a duration T2 after the arrival time of the one or more packets at the UE). In cases where the UE determines that another shared COT is available, the UE can transmit the one or more packets in that shared COT (e.g., by performing type 0 random resource selection within a valid resource selection window defined for sharing by the other COT, based at least in part on a COT sharing signal transmitted by the other UE that initiated the shared COT).

[0084] Alternatively, in cases where the UE determines that shared COT is unavailable, the UE may execute a random resource selected within the anticipated COT area. For example, such as Figure 5 As shown, the UE can determine the anticipated Category 4LBT completion timeline 512 (e.g., the estimated duration for executing the successful Category 4LBT procedure required to initiate COT), and can further determine a resource selection window covering the time period associated with the packets to be transmitted by the UE. For example, in Figure 5 In this context, five (5) packets numbered 1-5 are available to the UE, and the time period during which these five packets will be transmitted defines the resource selection window. However, because the UE may be required to perform a successful Category 4 LBT procedure before transmission, the effective resource selection window 514 may encompass a reduced portion of the total resource selection window, taking into account the anticipated Category 4 LBT completion timeline 512. For example, the UE may perform a Type 1 random resource selection within the effective resource selection window 514, which generally corresponds to the anticipated used COT shared area 520 (e.g., a COT area shared with other UEs for the initiating UE's transmission). In this case, the portion of the anticipated COT that appears after the transmission scheduled for the UE (e.g., after the anticipated used COT shared area 520) may be the remaining COT area 522, which other UEs can join by performing a successful Category 1 or Category 2 LBT procedure.

[0085] Therefore, as Figure 5As shown, the UE can perform random resource selection within the effective resource selection window 514 corresponding to the expected used COT shared area 520. For example, out of five packets arriving in time slot n-T1, the UE can perform random resource selection for three packets that are in the effective resource selection window 514 corresponding to the expected used COT shared area 520. Therefore, resources for the first two packets (numbered 1 and 2) are excluded from random resource selection because the first two packets are within the expected contention window countdown dead zone (e.g., occurring during the expected Category 4 LBT completion timeline). For example, resource selection is performed at the Media Access Control (MAC) layer, and LBT procedures are performed at the Physical (PHY) layer, which can lead to uncertainty about when the effective resource selection window 514 will begin. For example, the MAC layer can select the contention window based on the priority type associated with the traffic to be transmitted, and the PHY layer can select the countdown value for performing the LBT procedure based on the contention window value indicated by the MAC layer. Therefore, the MAC layer may not be able to determine the countdown value used by the PHY layer, and the MAC layer may perform an initial random resource selection within the effective resource selection window 514 based on the maximum duration used for the expected category 4LBT completion timeline 512.

[0086] Therefore, in cases where a UE attempts and successfully executes a Category 4LBT procedure to initiate a COT, the UE can typically begin transmitting on one or more sub-channels within the used COT shared area 520. In such cases, the UE's transmission can prevent other nearby UEs from successfully executing Category 4LBT procedures on each sub-channel occupied by that UE. As mentioned above, this can lead to inefficient use of frequency resources and / or high overhead for COT sharing signaling. For example, random resource selection at the initial stage (e.g., before the UE successfully executes a Category 4LBT procedure to initiate a COT) can be useful in reducing the probability that the resources(s) selected by the UE will conflict with non-shareable resources in a COT initiated by another UE, for example, because the UE initially cannot know whether the randomly selected resources(s) will be within the COT initiated by the UE or piggybacked in FDM mode within the used COT area shared with another initiating UE. However, if another shared COT is unavailable and the UE is able to successfully execute the Category 4 LBT procedure, the UE is not required to comply with resources that can be reserved by other UEs and can select any suitable resource from the COT initiated by the UE. In other words, the random resource selection algorithm used by the UE to perform the initial resource selection is generally designed to avoid collisions in licensed spectrum, but avoiding such collisions is unnecessary in unlicensed spectrum because the Category 4 LBT procedure ensures that no other device is transmitting on an unlicensed subchannel.

[0087] Therefore, as indicated by reference numeral 530, the UE can trigger an adjustment to the selected resource within the effective resource selection window 514 based at least in part on a successful Category 4 LBT procedure. In some aspects, the UE can trigger this adjustment based at least in part on the determination that the attempted Category 4 LBT procedure has been successful and that an LBT success occurring at least n-T3 prior to the pre-selected resource (e.g., the resource selected at slot n) has been confirmed, where T3 is the minimum duration prior to transmission when resource reselection or modification at the PHY layer becomes feasible. In this case, as... Figure 5 As shown, the preselected resources are adjusted to be contiguous in the time domain and can be further adjusted to occupy the minimum number of subchannels. For example, one or more preselected resources that appear later within the effective resource selection window 514 can be moved to earlier time resources (e.g., earlier symbols or time slots) to close transmission gaps, and subchannels associated with preselected resources that appear later within the effective resource selection window 514 can be aligned with subchannels associated with the first resource within the effective resource selection window 514. For example, as Figure 5 As shown, resource 4 is aligned with the subchannel selected for resource 1, and resource 5 is moved to the prior time slot to close the transmission gap and is also aligned with the subchannel selected for resource 1. Additionally or alternatively, in cases where a particular subchannel is occupied in a given time slot, another resource in the same time slot may be moved to an adjacent subchannel to minimize the number of subchannels occupied. Furthermore, in some aspects, the selected resources may be adjusted to provide a 16μs gap between consecutive transmissions to allow other UEs to execute Category 2 LBT procedures for transmission in the used COT shared area 520. Therefore, because resources 4 and 5 are adjusted in the time and / or frequency domains, the adjustment can be triggered if the Category 4 LBT procedure succeeds at least T3 prior to the time resources associated with resources 4 and 5.

[0088] In some respects, adjustments to resource selection can be associated with one or more initial transport block transmissions, and any resources previously reserved for retransmissions by the UE initiating COT can be maintained. For example, resources previously reserved for retransmissions by the initiating UE can be indicated in SCI-1 that other UEs may be in the decoding process. Therefore, other UEs joining COT can comply with the resource(s) reserved for retransmission, even if the reserved resources are in a shareable resource area, as described in more detail below. In this case, if one or more resources reserved for retransmission are in the same subchannel occupied by a first pre-scheduled resource within the COT shared area 520, the first pre-scheduled resource can be adjusted to occupy the same time slot as the reserved resources(s) in the next available subchannel adjacent to the subchannel reserved for retransmission. In this way, adjustments to resource selection ensure adjacent transmissions within the COT shared area 520, as retransmissions on reserved resources may or may not occur (e.g., depending on the HARQ feedback for the initial transmission).

[0089] In some aspects, as described above, the Category 4 LBT procedure can be executed at the PHY layer, which can trigger the MAC layer to perform resource modification to adjust the pre-selected resource to be adjacent in the time and / or frequency domains upon success of the Category 4 LBT procedure. For example, when a resource is pre-selected, the pre-selected resource is unconfirmed (e.g., because the Category 4 LBT procedure may fail) and is not indicated as a reserved resource in the SCI transmitted over the air to other UEs. Therefore, resource reselection or modification can be triggered at the MAC layer at least in part based on a successful Category 4 LBT procedure that occurred at least T3 prior to the resource being adjusted in the time and / or frequency domains, where T3 is the minimum duration for processing the resource adjustment. Furthermore, in some aspects, the MAC layer can adjust the first resource (e.g., a reference resource defining the sub-channel to which the resource is later moved) if the duration between the trigger indicating a successful Category 4 LBT and the start of the first resource meets (e.g., equals or exceeds) a threshold. For example, as described above, the anticipated Category 4LBT completion timeline 512 can be based on a worst-case scenario (e.g., the PHY layer selects the maximum countdown value), thereby allowing the Category 4LBT procedure to succeed earlier than the anticipated Category 4LBT completion timeline 512 determined by the MAC layer. For instance, when the MAC layer signals a contention window value to the PHY layer, the PHY layer selects a random number q between zero and the contention window value, and the MAC layer determines the anticipated Category 4LBT completion timeline 512 based on the maximum value of q (e.g., the contention window value). When q counts down to zero, the PHY layer attempts the Category 4LBT procedure and can trigger the MAC layer to perform resource modifications if the Category 4LBT procedure succeeds. Therefore, if the duration between the successful triggering of indication category 4LBT received at the MAC layer and the first (reference) resource in the effective resource selection window 514 meets a threshold (e.g., equal to or greater than T3), the MAC layer can move the first resource to an earlier time slot and the later resources in the effective resource selection window 514 can be adjusted accordingly (e.g., moved to an earlier time slot to be adjacent to the first resource at least in the time domain).

[0090] As indicated above, Figure 5 This is provided as an example. Other examples may differ from the one provided. Figure 5 The example described.

[0091] Figures 6A-6B This is a diagram illustrating example 600 associated with reduced COT shared signaling for sidelink communication in unlicensed spectrum, according to various aspects of this disclosure.

[0092] For example, such as Figures 6A-6B As shown, a UE that successfully executes a Category 4 LBT procedure can initiate a COT that includes an initial portion in which the UE performs one or more transmissions; this initial portion may be referred to herein as the used COT shared area. (As shown in...) Figures 6A-6B As further illustrated above, a COT initiated by a UE may include a later portion shared with other UEs (after the initiating UE's last transmission), which may be referred to herein as the remaining COT area. Figure 5 In more detail, the UE initiating COT can, at least in part, adjust the set of resources reserved for the initial transport block transmission to be contiguous in the time and / or frequency domains based on a successful Category 4 LBT procedure. In this way, the adjustment of the (initially random) resource selection results in fewer disjoint resources reserved for the initial transport block transmission. Therefore, adjusting resources within the used COT shared area to be contiguous in the time and / or frequency domains, as described herein, enables compact signaling to indicate the occupied resources reserved for the initiating UE. In this way, the UE can transmit COT shared signaling in SCI-1 to shorten processing timelines and reduce complexity and / or power consumption (e.g., because SCI-1 has a small payload size and is decoded by all UEs).

[0093] For example, as shown by reference numeral 610, the UE initiating a COT (e.g., UE0) may transmit an SCI including a COT sharing signal indicating non-shareable (e.g., occupied) resources in a COT sharing area that have been used. Generally, as described above, the non-shareable resources indicated in the COT sharing signal may be associated with one or more initial transport block transmissions. For example, retransmission resources may be reserved by an SCI-1 transmitted over the air by the UE before initiating the COT, and other UEs may have already decoded the SCI-1 indicating the reserved retransmission resources before the COT was initiated. Therefore, when resources are selected for retransmission, the UE can avoid placing retransmission resources in a fixed subchannel because the UE cannot determine whether the retransmission will be transmitted in a COT shared by another UE or a COT initiated by that UE. Furthermore, in cases where the retransmission is in an FDM (used COT sharing) area associated with another UE, the retransmission may potentially conflict with non-shareable resources reserved by the COT initiating UE. Therefore, random resource selection can be performed for retransmissions to reduce the probability of conflicts with non-shared resources reserved by the COT initiating UE. However, for the initial transport block transmission, pre-selected resources can be adjusted to be contiguous in the time and / or frequency domains to reduce the number of non-shared resources, which enables reduced COT shared signaling.

[0094] For example, as described above, a UE initiating COT adjusts resources to be contiguous in at least the time domain within the used COT-shared area based on a successful Category 4 LBT procedure, and can further adjust resources to be contiguous in the frequency domain (e.g., occupying the same or adjacent subchannels). For example, as Figure 6AAs shown, the UE initiating COT has adjusted the resource set to be time-contiguous (e.g., immediately adjacent), and all resources, except for the fifth resource which is contemporaneous with the sixth resource, are aligned with the sub-channel selected for the first resource (e.g., sub-channel #0). Therefore, in this case, the fifth resource is assigned to a sub-channel adjacent to the sub-channel selected for the first resource (sub-channel #1). In this case, the resource allocation within the used COT shared area is contiguous in both the time and frequency domains, thereby the COT sharing signal in the SCI informs the new transport block of the start and end sub-channels it occupies within the used COT shared area. In other words, the COT sharing signal indicates the minimum rectangle (e.g., start and end sub-channels and start and end symbols or time slots) occupied by the new transport block within the used COT shared area. Therefore, the COT sharing signal can indicate that the UE initiating the COT commits not to occupy resources used for the initial transmission outside the minimum rectangle defining the resources occupied by the new transport block (although resources previously reserved for retransmission may be outside the start and end subchannels and / or start and end transmission time intervals). Additionally or alternatively, one or more SCI transmissions at the start of the COT can indicate the largest set of subchannels, interleaving, and / or resource blocks (RBs) occupied by the new transport block within the COT sharing area already used.

[0095] Therefore, in some respects, the SCI can generally indicate non-shared resources reserved for new transport block transmissions by the COT initiating UE, whereby shared resources can include all resources in the RB set that enable Category 4 LBT procedures, excluding the non-shared resources indicated in the SCI. In this way, as shown by reference numeral 620, other UEs joining the COT can select resource candidates within the shared resources according to a default sidelink resource selection algorithm (e.g., random resource selection). Furthermore, regarding any retransmissions of resources reserved for the COT initiating UE falling within the shared resources, the sidelink resource selection or reselection algorithm can be designed to resolve any such conflicts (e.g., by avoiding previously reserved resources and / or overriding previous resource reservations with high-priority transmissions). Additionally, in cases where multiple UEs are joining a used COT shared area, sidelink congestion control algorithms can be used to limit conflicts on shared resources within the used COT shared area. As further illustrated by reference numeral 625, in the remaining COT areas, other UEs can join via Category 1 or Category 2 LBT procedures, as described above. For example, different UEs can share COT using TDM configurations across different time slots and / or FDM configurations on different subchannels and / or interleaving. In FDM mode, gaps can be provided at time slot boundaries for transmission bursts to give UEs joining later the opportunity to make LBTs open and join transmissions during the remainder of the COT area.

[0096] Generally speaking, based on the above references Figure 6A In the described example, the COT initiating UE that successfully executes the Category 4 LBT procedure adjusts the initially selected (or pre-selected) resource set to be contiguous in the time domain and further adjusts this resource set to occupy the same or adjacent subchannels. Therefore, adjusting the resource set to be contiguous enables overhead-reduced COT-shared signaling, as the COT initiating UE can indicate shareable resources by notifying non-shareable resources based on start and end subchannel signaling. However, adjusting the resource set to be contiguous in the frequency domain (e.g., occupying adjacent subchannels) sacrifices the gain achievable through frequency diversity, which can be problematic for non-interleaved waveforms. Therefore, as... Figure 6B As shown, when transmissions are performed in a COT-shared area, the COT-initiating UE can follow frequency hopping patterns on different sub-channels. In this case, the frequency hopping pattern can be a function of one or more identifiers, such as an identifier associated with the UE and / or a timeslot index, etc. In some respects, this function can be known to all sidelink UEs (e.g., based on wireless communication standards and / or sidelink signaling exchanged between UEs, etc.).

[0097] Therefore, as indicated by reference numeral 640, the SCI transmitted by the COT initiating UE may include a COT sharing signal indicating information used by other UEs to deduce the frequency hopping pattern used by the COT initiating UE. For example, as shown, a COT may cover multiple sub-channels in different time slots, and the frequency hopping pattern may define the frequency position of a first allocated sub-channel, where subsequent frequency positions depend on the frequency position of the first allocated sub-channel. Therefore, the COT sharing signal transmitted by the COT initiating UE may include an identifier used by the COT initiating UE to deduce the frequency hopping pattern. In this way, as indicated by reference numeral 650, other UEs joining the COT can deduce the frequency hopping pattern of the initiating UE at least partially based on the COT sharing signal, and can select resource candidates that will be excluded from the frequency positions occupied by the COT initiating UE. Furthermore, as indicated by reference numeral 655, in other COT areas, other UEs may join in a similar manner via Category 1 or Category 2 LBT procedures, as described above. In this way, the COT initiating UE can use frequency hopping to achieve frequency diversity gain, and the COT shared signal can have low overhead because the only information to be signaled is the identifier used to derive the frequency hopping mode.

[0098] As indicated above, Figures 6A-6B This is provided as an example. Other examples may differ from the one provided. Figures 6A-6B The example described.

[0099] Figure 7This is a diagram illustrating, for example, an example process 700 performed by a UE according to various aspects of this disclosure. The example process is an example in which a UE (e.g., UE 120 and / or UE 305, etc.) performs operations associated with LBT-based resource modification and reduction COT shared signaling for sidelink communication in unlicensed spectrum.

[0100] like Figure 7 As shown, in some aspects, process 700 may include selecting a set of resources (box 710) within a resource selection window to be transmitted on an unlicensed sidelink channel. For example, the UE (e.g., using...) Figure 8 The resource configuration component 808 described above can select, within the resource selection window, the set of resources to be transmitted on the unlicensed sidelink channel, as described above.

[0101] like Figure 7 As further illustrated, in some aspects, process 700 may include attempting an LBT procedure to initiate a COT (box 720) to be transmitted therein on an unlicensed sidelink channel. For example, the UE (e.g., using...) Figure 8 The LBT component 810 described herein can attempt an LBT procedure to initiate a COT to be transmitted on an unlicensed sidelink channel, as described above.

[0102] like Figure 7 As further illustrated, in some aspects, process 700 may include, within at least a portion of the resource selection window, adjusting the set of resources to be transmitted on the unlicensed sidelink channel to be contiguous at least in the time domain, based on the success of the LBT procedure (box 730). For example, the UE (e.g., using...) Figure 8 The resource configuration component 808 described herein can, within at least a portion of the resource selection window, adjust the set of resources to be transmitted on the unlicensed sidelink channel to be contiguous at least in the time domain, based on the success of the LBT procedure, as described above.

[0103] like Figure 7 As further illustrated, in some aspects, process 700 may include using a set of resources adjusted to be contiguous at least in that time domain to transmit on an unlicensed sidelink channel (box 740). For example, the UE (e.g., using...) Figure 8 The transmission component 804 described herein can use a set of resources that are adapted to be contiguous in at least that time domain to transmit on an unlicensed sidelink channel, as described above.

[0104] Process 700 may include additional aspects, such as any single aspect or any combination of aspects described below and / or in conjunction with one or more other processes described elsewhere herein.

[0105] In the first aspect, process 700 includes adjusting the set of resources to be transmitted on the unlicensed sidelink channel within this portion of the resource selection window to occupy the minimum number of contiguous subchannels in the frequency domain.

[0106] In the second aspect, either alone or in combination with the first aspect, one or more resources that are slightly later in the time domain are adjusted to be adjacent to the earliest resource in that portion of the resource selection window, either in the time domain or the frequency domain.

[0107] In the third aspect, either alone or in combination with one or more of the first and second aspects, the resource set adjusted within this portion of the resource selection window is pre-selected for one or more initial transport block transfers.

[0108] In the fourth aspect, either alone or in combination with one or more of the first to third aspects, the resource set is adjusted at the MAC layer at least in part based on the indication at the PHY layer that the LBT procedure has been successfully triggered.

[0109] In the fifth aspect, either alone or in combination with one or more of the first to fourth aspects, the duration between the successful triggering of the LBT procedure and the earliest resource in that portion of the resource selection window is determined, and the earliest resource in that portion of the resource selection window is moved to an earlier symbol or time slot based at least in part on the duration satisfying a threshold.

[0110] In the sixth aspect, either alone or in combination with one or more of the first to fifth aspects, process 700 includes transmitting on an unlicensed sidelink channel an SCI indicating a non-shareable resource within the COT that is reserved for transmission of one or more initial transport blocks.

[0111] In the seventh aspect, either alone or in combination with one or more of the first to sixth aspects, the SCI indicates non-shareable resources based at least in part on the start sub-channels and end sub-channels reserved for the transmission of the one or more initial transport blocks.

[0112] In the eighth aspect, either alone or in combination with one or more of the first to seventh aspects, the SCI further indicates the maximum set of occupied subchannels, interleaving, or RB sets in the COT.

[0113] In the ninth aspect, either alone or in combination with one or more of the first to eighth aspects, the shareable resources within the COT include all resources in the largest set of occupied subchannels, interleaving, or RB sets that exclude non-shareable resources.

[0114] In the tenth aspect, alone or in combination with one or more of the first to ninth aspects, process 700 includes, at least in part, adjusting the set of resources to be transmitted on the unlicensed sidelink channel to occupy different sub-channels based on frequency hopping patterns within that portion of the resource selection window.

[0115] In the eleventh aspect, alone or in combination with one or more of the first to tenth aspects, the frequency hopping mode is based at least in part on one or more identifiers associated with the UE, and the SCI includes the one or more identifiers associated with the UE to indicate non-shared resources reserved for the transmission of the one or more initial transport blocks.

[0116] although Figure 7 An example box of process 700 is shown, but in some respects, process 700 may include... Figure 7 The boxes depicted in the process are compared to additional boxes, fewer boxes, different boxes, or boxes arranged differently. Additionally or alternatively, two or more boxes in process 700 can be executed in parallel.

[0117] Figure 8 This is a block diagram of an example device 800 for wireless communication. Device 800 may be a UE, or a UE may include device 800. In some aspects, device 800 includes a receiving component 802 and a transmitting component 804, which may communicate with each other (e.g., via one or more buses and / or one or more other components). As shown, device 800 may use the receiving component 802 and the transmitting component 804 to communicate with another device 806 (such as a UE, a base station, or another wireless communication device). As further shown, device 800 may include one or more of a resource configuration component 808 or an LBT component 810, etc.

[0118] In some respects, device 800 can be configured to perform the functions described herein. Figure 5 and Figures 6A-6B The described one or more operations. Additionally or alternatively, the apparatus 800 may be configured to perform one or more processes described herein (such as...). Figure 7 Process 700). In some aspects, device 800 and / or Figure 8 One or more components shown may include the above combination Figure 2 One or more components of the described UE. Additionally or alternatively, Figure 8 One or more components shown above can be combined Figure 2Implemented within one or more of the described components. Additionally or alternatively, one or more components in the set of components may be implemented at least partially as software stored in memory. For example, a component (or a portion of a component) may be implemented as instructions or code stored in a non-transitory computer-readable medium and may be executed by a controller or processor to perform the function or operation of that component.

[0119] Receiver 802 may receive communications (such as reference signals, control information, data communications, or combinations thereof) from device 806. Receiver 802 may provide the received communications to one or more other components of device 800. In some aspects, receiver 802 may perform signal processing on the received communications (such as filtering, amplification, demodulation, analog-to-digital conversion, demultiplexing, deinterleaving, demapping, equalization, interference cancellation, or decoding, and other examples), and may provide the processed signal to one or more other components of device 806. In some aspects, receiver 802 may include combinations thereof. Figure 2 The described UE includes one or more antennas, demodulators, MIMO detectors, receiver processors, controllers / processors, memory, or combinations thereof.

[0120] The transmission component 804 can transmit communications (such as reference signals, control information, data communications, or combinations thereof) to the device 806. In some aspects, one or more other components of the device 806 can generate communications and provide the generated communications to the transmission component 804 for transmission to the device 806. In some aspects, the transmission component 804 can perform signal processing (such as filtering, amplification, modulation, digital-to-analog conversion, multiplexing, interleaving, mapping, encoding, etc.) on the generated communications and can transmit the processed signals to the device 806. In some aspects, the transmission component 804 may include combinations of the above. Figure 2 The described UE includes one or more antennas, modulators, transmit MIMO processors, transmit processors, controllers / processors, memories, or combinations thereof. In some aspects, the transmit component 804 may be co-located with the receive component 802 in a transceiver.

[0121] Resource configuration component 808 can select, within a resource selection window, the set of resources to be transmitted on the unlicensed sidelink channel. LBT component 810 can attempt an LBT procedure to initiate a COT to be transmitted on the unlicensed sidelink channel. Resource configuration component 808 can, within at least a portion of the resource selection window, adjust the set of resources to be transmitted on the unlicensed sidelink channel to be contiguous at least in the time domain based on the success of the LBT procedure. Transmission component 804 can use the resource set adjusted to be contiguous at least in the time domain to transmit on the unlicensed sidelink channel.

[0122] The resource configuration component 808 can adjust the set of resources to be transmitted on the unlicensed sidelink channel to occupy the minimum number of adjacent subchannels in the frequency domain within this part of the resource selection window.

[0123] Resource configuration component 808 can determine the duration between the trigger indicating successful LBT procedure and the earliest resource in that portion of the resource selection window. Resource configuration component 808 can move the earliest resource in that portion of the resource selection window to an earlier symbol or time slot, at least in part, based on the duration meeting a threshold.

[0124] The transmission component 804 can transmit on an unlicensed sidelink channel an SCI indicating a non-shareable resource within the COT that is reserved for transmission of one or more initial transport blocks.

[0125] Resource configuration component 808 can, within this portion of the resource selection window, adjust the set of resources to be transmitted on the unlicensed sidelink channel to occupy different subchannels, based at least in part on frequency hopping mode.

[0126] Figure 8 The number and arrangement of components shown are provided as an example. In practice, different arrangements may exist. Figure 8 The components shown are compared to additional components, fewer components, different components, or components arranged differently. Furthermore, Figure 8 The two or more components shown can be implemented within a single component, or Figure 8 The single component shown can be implemented as multiple distributed components. Additionally or alternatively, Figure 8 The collection of components shown (e.g., one or more components) can be executed as described by Figure 8 The other set of components shown in the diagram performs one or more functions.

[0127] The following provides an overview of the various aspects of this disclosure:

[0128] Aspect 1: A wireless communication method performed by a UE, comprising: selecting a set of resources to be transmitted on an unlicensed sidelink channel within a resource selection window; attempting an LBT procedure to initiate a COT to be transmitted on the unlicensed sidelink channel; and adjusting the set of resources to be transmitted on the unlicensed sidelink channel to be contiguous at least in the time domain, based at least in part on the success of the LBT procedure, within at least a portion of the resource selection window.

[0129] Aspect 2: The method of aspect 1 further includes: adjusting the set of resources to be transmitted on the unlicensed sidelink channel to occupy a minimum number of contiguous subchannels in the frequency domain within the portion of the resource selection window.

[0130] Aspect 3: The method as described in any of Aspects 1 to 2, wherein one or more resources later in the time domain are adjusted to be adjacent to the earliest resource in the portion of the resource selection window in one or more of the time or frequency domains.

[0131] Aspect 4: The method as described in any one of Aspects 1 to 3, wherein the resource set adjusted within the portion of the resource selection window is pre-selected for one or more initial transport block transmissions.

[0132] Aspect 5: The method of any one of Aspects 1 to 4, wherein the resource set is adjusted at the MAC layer at least in part based on the successful triggering of the LBT procedure at the PHY layer.

[0133] Aspect 6: The method of any one of Aspects 1 to 5, wherein adjusting the resource set comprises: determining the duration between a trigger indicating the success of the LBT procedure and the earliest resource in the portion of the resource selection window; and moving the earliest resource in the portion of the resource selection window to an earlier symbol or time slot, at least in part based on the duration satisfying a threshold.

[0134] Aspect 7: The method of any one of aspects 1 to 6 further comprises: transmitting on the unlicensed sidelink channel an SCI indicating a non-shareable resource within the COT reserved for transmission of one or more initial transport blocks.

[0135] Aspect 8: The method of aspect 7, wherein the SCI indicates the non-shareable resource based at least in part on the start subchannel and end subchannel reserved for the transmission of the one or more initial transport blocks.

[0136] Aspect 9: The method as described in any of Aspects 7 to 8, wherein the SCI further indicates the maximum set of occupied subchannels, interleaving, or RB sets in the COT.

[0137] Aspect 10: The method as described in Aspect 9, wherein the shareable resources within the COT include all resources in the largest set of occupied subchannels, interleaving, or RB sets that exclude the non-shareable resources.

[0138] Aspect 11: The method of any one of Aspects 1 or 3 to 10 further comprises: adjusting the set of resources to be transmitted on the unlicensed sidelink channel to occupy different subchannels, at least in part based on frequency hopping patterns, within the portion of the resource selection window.

[0139] Aspect 12: The method of aspect 11, wherein the frequency hopping mode is based at least in part on one or more identifiers associated with the UE, and wherein the SCI includes the one or more identifiers associated with the UE to indicate the non-shared resources reserved for transmission of the one or more initial transport blocks.

[0140] Aspect 13: An apparatus for wireless communication at a first device, comprising: a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform the method as described in any of Aspects 1 to 12.

[0141] Aspect 14: A UE for wireless communication, comprising a memory and one or more processors coupled to the memory, the memory and the one or more processors being configured to perform the method as described in any of Aspects 1 to 12.

[0142] Aspect 15: An apparatus for wireless communication, comprising at least one means for performing the method as described in any one of aspects 1 to 12.

[0143] Aspect 16: A non-transient computer-readable medium storing code for wireless communication, said code including instructions executable by a processor to perform the methods described in any of Aspects 1 to 12.

[0144] Aspect 17: A non-transient computer-readable medium storing one or more instructions for wireless communication, said one or more instructions comprising, when executed by one or more processors of a UE, causing said one or more processors to perform the method as described in any of Aspects 1 to 12.

[0145] The foregoing disclosure provides explanations and descriptions, 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 foregoing disclosure or may be obtained through practice.

[0146] As used herein, the term "component" is intended to be broadly interpreted as hardware and / or a combination of hardware and software. "Software" should be broadly interpreted as instructions, instruction sets, code, code segments, program code, programs, subroutines, software modules, applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, and / or functions, whether referred to as software, firmware, middleware, microcode, hardware description languages, or other terms. As used herein, processors are implemented using hardware and / or a combination of hardware and software. It will be apparent that the systems and / or methods described herein can be implemented in various forms of hardware and / or combinations of hardware and software. The actual dedicated control hardware or software code used to implement these systems and / or methods is not limited in any way. Thus, the operation and behavior of these systems and / or methods are described herein without reference to any specific software code—it is understood that software and hardware can be designed to implement these systems and / or methods, at least in part, based on the descriptions herein.

[0147] As used in this article, depending on the context, a threshold can refer to a value greater than the threshold, greater than or equal to the threshold, less than the threshold, less than or equal to the threshold, equal to the threshold, not equal to the threshold, etc.

[0148] Although specific combinations of features are described in the claims and / or disclosed in the specification, these combinations are not intended to limit the disclosure of aspects. In fact, many of these features can be combined in ways not specifically described in the claims and / or not disclosed in the specification. Although each dependent claim listed below may be directly subordinated to only one claim, the disclosure of aspects includes each dependent claim being combined with each other claim in this set of claims. As used herein, the phrase “at least one of” refers to any combination of these items, including single members. As an example, “at least one of a, b, or c” is intended to cover: a, b, c, ab, ac, bc, and abc, as well as any combination having multiple identical elements (e.g., aa, aaa, aab, aac, abb, acc, bb, bbb, bbc, cc, and ccc, or any other ordering of a, b, and c).

[0149] The elements, actions, or instructions used herein should not be construed as critical or necessary unless explicitly stated otherwise. Furthermore, as used herein, the articles “a” and “a certain” are intended to include one or more items and may be used interchangeably with “one or more.” Additionally, as used herein, the article “the” is intended to include one or more items referenced in conjunction with the article “the” and may be used interchangeably with “one or more.” Furthermore, as used herein, the terms “set” and “group” are intended to include one or more items (e.g., related items, unrelated items, or a combination of related and unrelated items) and may be used interchangeably with “one or more.” Where only one item is intended, the phrase “only one” or similar language is used. Moreover, as used herein, the terms “have,” “contain,” “include,” etc., are intended to be open-ended terms. Additionally, the phrase “based on” is intended to mean “at least partially based on” unless otherwise explicitly stated. Moreover, as used herein, the term “or” is intended to be inclusive when used in a sequence and may be used interchangeably with “and / or” unless otherwise explicitly stated (e.g., in combination with “either of” or “only one of”).

Claims

1. A wireless communication method performed by a user equipment (UE), comprising: Select the set of resources to be transmitted on the unlicensed sidelink channel within the resource selection window; Attempt to listen before speaking (LBT) procedure to initiate channel occupancy time (COT) for transmission on the unlicensed sidelink channel. Within at least a portion of the resource selection window, the set of resources to be transmitted on the unlicensed sidelink channel is adjusted to be contiguous at least in the time domain, based on the success of the LBT procedure. as well as Transmission is carried out on the unlicensed sidelink channel using the resource set that is adjusted to be contiguous in at least the time domain.

2. The method of claim 1, further comprising: Within the resource selection window, the set of resources to be transmitted on the unlicensed sidelink channel is adjusted to occupy the minimum number of adjacent subchannels in the frequency domain.

3. The method of claim 1, wherein one or more resources later in the time domain are adjusted to be adjacent to the earliest resource within the portion of the resource selection window in one or more of the time or frequency domains.

4. The method of claim 1, wherein the resource set adjusted within the portion of the resource selection window is pre-selected for one or more initial transport block transmissions.

5. The method of claim 1, wherein the resource set is adjusted at the media access control layer at least in part based on the successful triggering of the LBT procedure at the physical layer.

6. The method of claim 5, wherein adjusting the resource set comprises: Determine the duration between the trigger indicating the success of the LBT procedure and the earliest resource in the portion of the resource selection window; as well as The earliest resource in the portion of the resource selection window is moved to an earlier symbol or time slot, at least in part based on the duration meeting a threshold.

7. The method of claim 1, further comprising: Transmit sidelink control information (SCI) on the unlicensed sidelink channel, indicating non-shared resources within the COT that are reserved for transmission of one or more initial transport blocks.

8. The method of claim 7, wherein the SCI indicates the non-shareable resource based at least in part on the start subchannel and end subchannel reserved for the transmission of the one or more initial transport blocks.

9. The method of claim 7, wherein the SCI further indicates the maximum set of occupied subchannels, interleavings, or resource blocks in the COT.

10. The method of claim 9, wherein the shareable resources within the COT include all resources in the largest set of occupied subchannels, interleavings, or resource block sets that exclude the non-shareable resources.

11. The method of claim 7, further comprising: Within the resource selection window, at least in part based on frequency hopping mode, the set of resources to be transmitted on the unlicensed sidelink channel is adjusted to occupy different sub-channels.

12. The method of claim 11, wherein the frequency hopping mode is at least partially based on one or more identifiers associated with the UE, and the SCI includes the one or more identifiers associated with the UE to indicate the non-shared resources reserved for transmission of the one or more initial transport blocks.

13. A user equipment (UE) for wireless communication, comprising: Memory; as well as One or more processors operatively coupled to the memory, the memory and the one or more processors being configured to: Select the set of resources to be transmitted on the unlicensed sidelink channel within the resource selection window; Attempt to listen before speaking (LBT) procedure to initiate channel occupancy time (COT) for transmission on the unlicensed sidelink channel. Within at least a portion of the resource selection window, the set of resources to be transmitted on the unlicensed sidelink channel is adjusted to be contiguous at least in the time domain, based on the success of the LBT procedure. as well as Transmission is carried out on the unlicensed sidelink channel using the resource set that is adjusted to be contiguous in at least the time domain.

14. The UE of claim 13, wherein the one or more processors are further configured to: Within the resource selection window, the set of resources to be transmitted on the unlicensed sidelink channel is adjusted to occupy the minimum number of adjacent subchannels in the frequency domain.

15. The UE of claim 13, wherein one or more resources later in the time domain are adjusted to be adjacent to the earliest resource within the portion of the resource selection window in one or more of the time or frequency domains.

16. The UE of claim 13, wherein when adjusting the resource set, the one or more processors are configured to: Determine the duration between the successful triggering of the LBT procedure and the earliest resource in the portion of the resource selection window; and The earliest resource in the portion of the resource selection window is moved to an earlier symbol or time slot, at least in part based on the duration meeting a threshold.

17. The UE of claim 13, wherein the one or more processors are further configured to: Transmit sidelink control information (SCI) on the unlicensed sidelink channel, indicating non-shared resources within the COT that are reserved for transmission of one or more initial transport blocks.

18. The UE of claim 17, wherein the one or more processors are further configured to: Within the resource selection window, at least in part based on frequency hopping mode, the set of resources to be transmitted on the unlicensed sidelink channel is adjusted to occupy different sub-channels.

19. A non-transient computer-readable medium storing an instruction set for wireless communication, the instruction set comprising: One or more instructions, which, when executed by one or more processors of a user equipment (UE), cause the UE to: Select the set of resources to be transmitted on the unlicensed sidelink channel within the resource selection window; Attempt to listen before speaking (LBT) procedure to initiate channel occupancy time (COT) for transmission on the unlicensed sidelink channel. Within at least a portion of the resource selection window, the set of resources to be transmitted on the unlicensed sidelink channel is adjusted to be contiguous at least in the time domain, based on the success of the LBT procedure. as well as Transmission is carried out on the unlicensed sidelink channel using the resource set that is adjusted to be contiguous in at least the time domain.

20. The non-transient computer-readable medium of claim 19, wherein the one or more instructions further cause the UE to: Within the resource selection window, the set of resources to be transmitted on the unlicensed sidelink channel is adjusted to occupy the minimum number of adjacent subchannels in the frequency domain.

21. The non-transient computer-readable medium of claim 19, wherein one or more resources later in the time domain are adjusted to be adjacent to the earliest resource within the portion of the resource selection window in one or more of the time or frequency domains.

22. The non-transient computer-readable medium of claim 19, wherein the one or more instructions causing the UE to adjust the resource set cause the UE to: Determine the duration between the successful triggering of the LBT procedure and the earliest resource in the portion of the resource selection window; and The earliest resource in the portion of the resource selection window is moved to an earlier symbol or time slot, at least in part based on the duration meeting a threshold.

23. The non-transient computer-readable medium of claim 19, wherein one or more instructions further cause the UE to: Transmit sidelink control information (SCI) on the unlicensed sidelink channel, indicating non-shared resources within the COT that are reserved for transmission of one or more initial transport blocks.

24. The non-transient computer-readable medium of claim 23, wherein one or more instructions further cause the UE to: Within the resource selection window, at least in part based on frequency hopping mode, the set of resources to be transmitted on the unlicensed sidelink channel is adjusted to occupy different sub-channels.

25. A device for wireless communication, comprising: A means for selecting a set of resources to be transmitted on an unlicensed sidelink channel within a resource selection window; A means for attempting a Listen-Before-Speak (LBT) procedure to initiate a Channel Occupancy Time (COT) for transmission to be made on the unlicensed sidelink channel; A means for adjusting the set of resources to be transmitted on the unlicensed sidelink channel to be contiguous at least in the time domain, based at least in part on the success of the LBT procedure within at least a portion of the resource selection window. as well as A means for transmitting on the unlicensed sidelink channel using the resource set that is adapted to be contiguous in at least the time domain.

26. The apparatus of claim 25, further comprising: A means for adjusting the set of resources to be transmitted on the unlicensed sidelink channel within the portion of the resource selection window to occupy the minimum number of adjacent subchannels in the frequency domain.

27. The device of claim 25, wherein one or more resources later in the time domain are adjusted to be adjacent to the earliest resource in the portion of the resource selection window, either in the time domain or the frequency domain.

28. The apparatus of claim 25, wherein the means for adjusting the resource set comprises: A means for determining the duration between the successful triggering of the LBT procedure and the earliest resource in the portion of the resource selection window; as well as A means for moving the earliest resource in a portion of the resource selection window to an earlier symbol or time slot, at least in part based on the duration satisfying a threshold.

29. The apparatus of claim 25, further comprising: A means for transmitting, over the unlicensed sidelink channel, sidelink control information (SCI) indicating non-shareable resources within the COT that are reserved for transmission of one or more initial transport blocks.

30. The apparatus of claim 29, further comprising: A means for adjusting the set of resources to be transmitted on the unlicensed sidelink channel to occupy different subchannels, at least in part based on frequency hopping mode, within the portion of the resource selection window.

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