Method and apparatus for sharing channel occupancy time

Abstract

Embodiments of this disclosure relate to methods and apparatus. According to some embodiments of this disclosure, a method may include: performing a channel access procedure based on a first channel access priority category (CAPC) value to initiate a channel occupancy time (COT) for data transmission, wherein the first CAPC value is determined from a set of CAPC values ​​based on a first priority level value of the data; and transmitting sidelink control information (SCI) within the COT, wherein the SCI indicates subsequent time resources within the COT available for sidelink transmission.

Description

Technical Field

[0001] The embodiments of this disclosure generally relate to wireless communication technologies, and more specifically, to shared channel occupancy time (COT). Background Technology

[0002] In wireless communication systems, such as mobile devices, user equipment (UEs) can communicate with another UE via a data path supported by an operator network (e.g., cellular or Wi-Fi network infrastructure). This data path supported by the operator network may include base stations (BSs) and multiple gateways.

[0003] When UEs are relatively close to each other, a radio link or sidelink can be established between the two UEs to provide device-to-device (D2D) communication without traversing a direct link to the BS. The term "sidelink" or "SL" can refer to a direct radio link established for communication between devices (e.g., UEs) rather than via cellular infrastructure as discussed above. In this case, "sidelink" is also called D2D or sidelink communication link. Sidelink communication links can be used in any suitable telecommunications network according to various standards, where the telecommunications network can configure resource sets for use by the UEs during this sidelink communication.

[0004] D2D communication has evolved into Vehicle-to-Everything (V2X) communication within the Long Term Evolution (LTE) sidelink standard. V2X communication technology encompasses communication involving vehicles as either the source or destination of messages. In New Radio (NR) communication systems, a Transmitting (Tx) UE can send a sidelink transmission to a specific Receiving (Rx) UE in unicast mode, to a group of Rx UEs in multicast mode, or to a range of Rx UEs in broadcast mode.

[0005] The UE can operate on both licensed and unlicensed spectrum. For transmissions on unlicensed spectrum, to ensure fair coexistence with other radio systems, the UE is required to perform a channel access procedure (e.g., a Listen-Before-Speak (LBT) procedure) before transmitting on unlicensed spectrum. In the LBT procedure, the UE performs an energy detection on a specific channel. If the detected energy is below a predefined threshold, the channel is considered empty and available for transmission, and the LBT procedure succeeds. Only when the LBT procedure succeeds can the UE begin transmitting on the channel and occupy the channel-specific time-of-use (COT), which is less than the maximum time-of-use (MCOT). Otherwise, the UE cannot begin transmitting and continues executing another LBT procedure until a successful LBT procedure is completed. Sidelink transmissions can also be performed on unlicensed spectrum.

[0006] To improve the utilization of radio resources, it is necessary to address COT sharing between UEs to enable sidelink transmissions on unlicensed spectrum. Summary of the Invention

[0007] Some embodiments of this disclosure provide a method. The method may include: performing a channel access procedure based on a first channel access priority category (CAPC) value to initiate a channel occupancy time (COT) for data transmission, wherein the first CAPC value may be determined from a set of CAPC values ​​based on a first priority level value of the data; and transmitting sidelink control information (SCI) within the COT, wherein the SCI may indicate subsequent time resources within the COT available for sidelink transmission.

[0008] Some embodiments of this disclosure provide a method. The method can be performed by a second user equipment (UE). The method may include: receiving first sidelink control information (SCI) from a first UE, wherein: the first SCI may indicate subsequent time resources within a channel occupancy time (COT) available for sidelink transmission, the COT being initiated by the first UE after executing a first channel access procedure using a first channel access priority class (CAPC) value to transmit first data, and the first CAPC value being determined from a set of CAPC values ​​based on a first priority level value of the first data.

[0009] Some embodiments of this disclosure provide an apparatus. According to some embodiments of this disclosure, the apparatus includes: at least one non-transitory computer-readable medium storing computer-executable instructions thereon; at least one receiving circuitry; at least one transmitting circuitry; and at least one processor coupled to the at least one non-transitory computer-readable medium, the at least one receiving circuitry, and the at least one transmitting circuitry, wherein the at least one non-transitory computer-readable medium and the computer-executable instructions are configured to cause the apparatus to perform a method according to some embodiments of this disclosure using the at least one processor. Attached Figure Description

[0010] To illustrate how the advantages and features of this disclosure can be obtained, the description of this disclosure is presented with reference to specific embodiments of the disclosure illustrated in the accompanying drawings. These drawings depict only exemplary embodiments of the disclosure and should therefore not be considered as limiting its scope.

[0011] Figure 1 Illustrated schematic diagrams of wireless communication systems according to some embodiments of the present disclosure;

[0012] Figure 2 A flowchart illustrating an exemplary procedure for wireless communication according to some embodiments of the present disclosure;

[0013] Figure 3 A flowchart illustrating an exemplary procedure for wireless communication according to some embodiments of the present disclosure;

[0014] Figure 4 This describes an exemplary UE-initiated COT according to some embodiments of this disclosure;

[0015] Figure 5 This describes an exemplary UE-initiated COT according to some embodiments of this disclosure;

[0016] Figure 6 This describes an exemplary UE-initiated COT according to some embodiments of this disclosure;

[0017] Figure 7 This describes an exemplary UE-initiated COT according to some embodiments of this disclosure; and

[0018] Figure 8 A block diagram illustrating an exemplary device according to some embodiments of the present disclosure. Detailed Implementation

[0019] The detailed description of the accompanying drawings is intended to illustrate preferred embodiments of the present disclosure and is not intended to represent the only form in which the present disclosure may be practiced. It should be understood that the same or equivalent functionality may be accomplished through different embodiments that are intended to be covered within the spirit and scope of the present disclosure.

[0020] Reference will now be made in detail to some embodiments of this disclosure, examples of which are illustrated in the accompanying drawings. To facilitate understanding, embodiments are provided under specific network architectures and new service scenarios, such as 3GPP 5G (NR), 3GPP Long Term Evolution (LTE) Release 8, etc. It has been considered that all embodiments in this disclosure are also applicable to similar technical problems as network architectures and new service scenarios develop; furthermore, the terminology cited in this disclosure may change, which should not affect the principles of this disclosure.

[0021] Figure 1 A schematic diagram illustrating a wireless communication system 100 according to some embodiments of the present disclosure.

[0022] like Figure 1 As shown, the wireless communication system 100 may include a base station (e.g., BS 120) and several UEs 110 (e.g., UE 110a, UE 110b, and UE 110c). Although in Figure 1 The description depicts a specific number of UEs 110 and one BS 120, but it is understood that the wireless communication system 100 may include more BSs and more or fewer UEs outside the coverage area of ​​the BS.

[0023] The UE and base station may support communication based on, for example, 3G, Long Term Evolution (LTE), LTE Advanced (LTE-A), New Radio (NR), or (a number of) other suitable protocols. In some embodiments of this disclosure, BS 102 may be referred to as an access point, access terminal, base station, base cell, macro cell, node-B, evolved Node B (eNB), gNB, home node-B, relay node, or device, or may be described using other terms used in the art. UE 110a, UE 110b, or UE 110c may include (e.g., but not limited to) computing devices, wearable devices, mobile devices, IoT devices, vehicles, etc. Those skilled in the art will understand that the terminology described in this disclosure may change as technology develops and advances, but this should not affect or limit the principles and spirit of this disclosure.

[0024] BS 120 may define one or more cells, and each cell may have a coverage area 130. In the exemplary wireless communication system 100, some UEs (e.g., UE 110a and UE 110b) are within the coverage area of ​​BS 120, and BS 120 may not be... Figure 1 The specific base station 120 shown can be any of the base stations 120 in a wireless communication system, and some UEs (e.g., UE 110c) are outside the coverage area of ​​the base station 120. For example, in the case where the wireless communication system includes two base stations 120, UE 110a being within the coverage area of ​​either of the two base stations 120 means that UE 110a is within the coverage area of ​​the base station 120 in the wireless communication system (i.e., within the coverage area); and UE 110a being outside the coverage area of ​​either base station 120 means that UE 110a is outside the coverage area of ​​the base station 120 in the wireless communication system (i.e., outside the coverage area).

[0025] Still referencing Figure 1 UE 110a and UE 110b can be connected via, for example, a Uu link (from... Figure 1 (Indicated by the dashed arrow in the diagram) communicates with BS120. UE 110a, UE 110b, and UE 110c can communicate via a side link (from...). Figure 1 (Indicated by solid arrows) can communicate with each other and form UE groups. Sidelink transmission can have two resource allocation modes. One of the two resource allocation modes is based on base station scheduling and can be called mode 1; the other is based on UE autonomous selection and can be called mode 2.

[0026] In both Mode 1 and Mode 2, sidelink transmission may involve a Physical Sidelink Control Channel (PSCCH) and an associated Physical Sidelink Shared Channel (PSSCH), which is scheduled by Sidelink Control Information (SCI) carried on the PSCCH. The SCI and associated PSSCH can be transmitted unicast from the transmitting UE (hereinafter referred to as "Tx UE") to the receiving UE (hereinafter referred to as "Rx UE"), multicast to a group of Rx UEs, or broadcast to a range of Rx UEs. For example, refer to... Figure 1 UE 110a (used as a Tx UE) can transmit data to UE 110b or UE 110c (used as an Rx UE).

[0027] In Mode 1, resources can be assigned by the base station via dynamic scheduling or (some) configured authorization. In Mode 2, the UE may need to perform resource sensing by monitoring and decoding all SCIs transmitted in the SCI resource set area to obtain resource reservation information. In this way, the UE can identify candidate resources available for communication. The UE can then, for example, randomly select the desired resource from the identified candidate resources.

[0028] BS (e.g.) Figure 1 BS 120) and UE (e.g.) Figure 1 UEs 110a, 110b, and 110c can operate in both licensed and unlicensed spectrum. For example, unlicensed spectrum can be a carrier frequency of approximately 6 GHz or 60 GHz. NR-U (NR System Access on Unlicensed Spectrum) operating bandwidth can be an integer multiple of 20 MHz. To achieve fair coexistence between NR systems (e.g., NR-U systems) and other wireless systems (e.g., Wi-Fi), channel access procedures (e.g., Listen-After-Speak (LBT) tests or LBT procedures) can be performed in 20 MHz increments before communication on unlicensed spectrum. For carrier bandwidths greater than 20 MHz, such as 40 MHz, 60 MHz, 80 MHz, or 100 MHz, the carrier bandwidth can be divided into multiple subbands (also called "LBT subbands"), each with a 20 MHz bandwidth and indexable.

[0029] When unlicensed spectrum is used for sidelink transmissions between UEs (e.g., between a Tx UE and (some) Rx UEs), the UE (e.g., a Tx UE) may be required to perform a channel access procedure (e.g., LBT procedure) before performing any sidelink transmissions. The LBT procedure may be performed based on energy detection in each sensing slot. Specifically, if the energy detected on a channel in a sensing slot is below an energy detection threshold, then the channel is considered empty, interference-free, or available in that sensing slot; otherwise, the channel is considered occupied or unavailable in that sensing slot.

[0030] For Type 1 channel access procedures, also known as "LBT Category 4 or LBT Cat.4 procedures," energy detection typically needs to be performed over a range of several to hundreds of sensing slots. At the start of the LBT Cat.4 procedure, a random backoff counter is selected from the contention window. Whenever the UE detects that the channel is empty in a sensing slot, the random backoff counter is decremented by 1. When the random backoff counter decrements to zero, the channel is considered available and the LBT Cat.4 procedure is successful. The UE can then determine that the Contention Window (COT) is not greater than the Median Memory Window (MCOT) and begin sidelink transmission on the channel within the COT. The channel access parameters mentioned above (such as the contention window, backoff counter, and MCOT) are associated with a Channel Access Priority Class (CAPC) value determined based on the traffic data to be transmitted by the UE. More detailed Type 1 channel access procedures are specified in the 3GPP standard specification TS 37.213.

[0031] For example, 3GPP standard specification TS 37.213 shows Table 4.1.1-1, which lists the CAPC used for downlink (DL) transmissions, i.e., the CAPC values ​​used by the BS to perform the LBT Cat.4 procedure before DL transmissions. 3GPP standard specification TS 37.213 also shows Table 4.2.1-1, which lists the CAPC used for uplink (UL) transmissions, i.e., the CAPC values ​​used by the UE to perform the LBT Cat.4 procedure before uplink transmissions. Tables 4.1.1-1 and 4.2.1-1 are reproduced below. The definitions of the parameters in the tables below are specified in 3GPP standard specification TS 37.213.

[0032] Table 4.1.1-1: Channel Access Priority Categories for DL

[0033]

[0034] Table 4.2.1-1: Channel Access Priority Categories for UL

[0035]

[0036] In some embodiments of this disclosure, the CAPC values ​​defined for DL ​​and UL transmissions can also be used for sidelink transmissions. For example, data to be transmitted by the UE can be associated with a priority level. The UE can determine a CAPC value from a set of CAPC values ​​listed in Table 4.1.1-1 for DL ​​or a set of CAPC values ​​listed in Table 4.2.1-1 for UL based on the priority level value of the data to be transmitted by the UE. However, in some communication scenarios (e.g., V2X communication scenarios), more than four priority levels (e.g., eight priority levels) are defined for sidelink data transmission, while in the above tables, only four CAPC values ​​are defined for each of DL and UL transmissions. Therefore, it is necessary to redesign the CAPC values ​​for sidelink transmissions.

[0037] Furthermore, to improve the utilization of radio resources, it is necessary to address COT sharing between UEs for sidelink transmissions on unlicensed spectrum. More details regarding embodiments of this disclosure will be described below in conjunction with the accompanying drawings.

[0038] Figure 2 A flowchart illustrating an exemplary procedure 200 for wireless communication according to some embodiments of the present disclosure. The procedure can be performed by a UE (e.g., Figure 1 Execute on UE 110a, UE 110b or UE 110c.

[0039] The details described in all the foregoing embodiments of this disclosure are applicable to Figure 2 The embodiments shown in the example are illustrated. Those skilled in the art will understand that the sequence of operations in the exemplary procedure 200 can be changed and some operations in the exemplary procedure 200 can be eliminated or modified without departing from the spirit and scope of this disclosure.

[0040] In some embodiments of this disclosure, the UE may determine a CAPC value from a set of Channel Access Priority Class (CAPC) values ​​based on the priority level value of the data to be transmitted by the UE. Each CAPC value in the set of CAPC values ​​may be correlated with a set of channel access parameters (e.g., allowed contention window size, m...). p The value is associated with MCOT and can correspond to the corresponding data priority level value. (See reference) Figure 2 In operation 211, the UE may perform a channel access procedure (e.g., a type 1 channel access procedure) based on a determined CAPC value to initiate channel occupancy time (COT) to transmit data.

[0041] In some embodiments of this application, assuming there are eight data priority levels specified in a specific communication scenario, a set of CAPC values ​​can be defined using eight CAPC values, each corresponding to a specific one of the eight data priority levels. For example, the eight data priority levels can correspond to priority level values ​​"0" to "7", where priority level value "0" indicates the highest priority or priority level, and priority level value "7" indicates the lowest priority or priority level. A set of CAPC values ​​can include CAPC values ​​"1" to "8". CAPC values ​​"1" to "8" can correspond to priority level values ​​"0" to "7" respectively. It should be understood that the number of data priority levels, priority level values, and CAPC values ​​are used here for illustrative purposes only and should not be construed as limiting the embodiments of this disclosure.

[0042] A set of CAPC values ​​and associated channel access parameters can be defined based on at least one of the following principles:

[0043] • The higher the priority level, the shorter the MCOT.

[0044] • The higher the priority level, the more m p The smaller the value;

[0045] • Shorter MCOTs can be defined for more urgent business operations; and

[0046] • Regardless of whether there are (a number of) other wireless systems sharing the same spectrum.

[0047] Taking into account some or all of the above principles, Tables 1 to 3 below show several sets of exemplary CAPC values.

[0048] Table 1: Channel Access Priority Categories for Sidelink Transmission Systems Where Other Wireless Systems Do Not Share the Same Spectrum

[0049]

[0050] Table 2: Channel Access Priority Categories for Sidelink Transmission Systems That May Share the Same Spectrum

[0051]

[0052] Table 3: Channel Access Priority Categories for Sidelink Transmission Systems That May Share the Same Spectrum

[0053]

[0054]

[0055] Table 1 can be used when it can be guaranteed that no other wireless systems (e.g., WiFi) exist on the unlicensed spectrum. Table 2 or Table 3 can be used when other wireless systems (e.g., WiFi) may exist on the same unlicensed spectrum. In Table 3, a 1ms MCOT (corresponding to a CAPC value "1") is introduced for single-transmission SCI / PSSCH transmissions in the case of extremely urgent services. It should be understood that Tables 1 to 3 above are for illustrative purposes only and should not be construed as limiting the embodiments of this disclosure.

[0056] In some embodiments of this disclosure, the four DLCAPC values ​​defined in Table 4.1.1-1 of 3GPP standard specification TS 37.213 or the four UL CAPC values ​​defined in Table 4.2.1-1 of 3GPP standard specification TS 37.213 can be used for sidelink transmission. For example, at least one of the four DL CAPC values ​​or four UL CAPC values ​​mentioned above can be reused corresponding to two or more priority levels.

[0057] Assuming that eight data priority levels are specified in a specific communication scenario, Tables 4A and 4B below show an exemplary mapping between CAPC values ​​and priority level values.

[0058] Table 4A: Mapping between priority level values ​​and CAPC values ​​by reusing 4 DL CAPC values

[0059] Priority CAPC(p) 0 1 1 1 2 2 3 2 4 3 5 3 6 4 7 4

[0060] Table 4B: Mapping between priority level values ​​and CAPC values ​​by reusing four UL CAPC values

[0061]

[0062]

[0063] As shown in Table 4A, each of the eight data priority levels (corresponding to priority level values ​​"0" to "7") maps to one of the four DL CAPC values ​​defined in Table 4.1.1-1 of the 3GPP standard specification TS 37.213. As shown in Table 4B, each of the eight data priority levels (corresponding to priority level values ​​"0" to "7") maps to one of the four UL CAPC values ​​defined in Table 4.2.1-1 of the 3GPP standard specification TS 37.213. Some priority levels may correspond to the same CAPC value (e.g., the two highest priority levels with priority level values ​​"0" and "1" correspond to CAPC value "1"), and therefore may be associated with the same set of channel access parameters. It should be understood that Tables 4A and 4B above are for illustrative purposes only and should not be construed as limiting the embodiments of this disclosure.

[0064] In some embodiments of this disclosure, a set of CAPC values ​​(e.g., Table 1 or Table 4A and Table 4.1.1-1) may be configured by higher-layer (e.g., Radio Resource Control (RRC)) signaling. In some embodiments of this disclosure, a set of CAPC values ​​may be predefined at the UE, for example, predefined in a standard.

[0065] In some embodiments of this disclosure, data to be transmitted by the UE may correspond to multiple priority level values ​​and may be transmitted within the same COT. Since each priority level value may correspond to a CAPC value, the transmitted data may correspond to multiple CAPC values. In some embodiments of this disclosure, the UE may determine the CAPC value used to perform the channel access procedure based on the highest priority level value (i.e., the lowest priority) among the multiple priority level values. In some embodiments of this disclosure, the CAPC value used to perform the channel access procedure may be the highest CAPC value among the multiple CAPC values.

[0066] Still referencing Figure 2 After initiating the COT, the UE (hereinafter "UE1") can perform one or more consecutive sidelink transmissions without any gaps in the time domain. The UE can perform sidelink transmissions in unicast, multicast, or broadcast mode. For example, in operation 213, UE1 can transmit SCI (e.g., PSCCH) within the COT. UE1 can further transmit associated data (e.g., PSSCH) within the COT. Figure 2 (Not shown in the document). In some embodiments of this disclosure, after its sidelink transmission, UE1 may determine to share part or all of the remaining COT with at least one other UE for use in sidelink transmission. The at least one other UE may include (a number of) Rx UEs of UE1’s sidelink transmission and any other UEs monitoring SCIs transmitted by UE1 in the SCI resource set area.

[0067] In some embodiments of this disclosure, UE1 may disable Hybrid Automatic Repeat Request Acknowledgment (HARQ-ACK) feedback for sidelink transmissions. HARQ-ACK feedback is carried on the Physical Sidelink Feedback Channel (PSFCH). In these embodiments, UE1 may not reserve PSFCH resources in the COT, and therefore may share all remaining COT resources with other UEs.

[0068] In some embodiments of this disclosure, UE1 may enable HARQ-ACK feedback for sidelink transmissions in the COT. UE1 may, for example, reserve PSFCH resources at the end of the COT. In these embodiments, UE1 may share the remaining COT with other UEs, except for the reserved PSFCH.

[0069] Figure 4This illustrates an exemplary UE-initiated COT 400, where PSFCH resources are reserved at the end of the COT. UE1 can initiate COT 400 to transmit data after successfully executing the channel access procedure. (Example...) Figure 4 As shown, UE1 can perform sidelink transmissions 401 and 402 within COT 400. Each of sidelink transmissions 401 and 402 can include a corresponding SCI and associated data scheduled by the SCI. UE1 can reserve resources for HARQ-ACK feedback corresponding to at least one of sidelink transmissions 401 and 402 at the end of COT 400. For example, UE1 can receive PSFCH transmission 405 within COT 400. UE1 can determine to share the remaining COT with other UEs. For example, UE (referred to as "UE2" for simplicity) can perform sidelink transmission 403 within COT 400 using shared resources, and another UE (referred to as "UE3" for simplicity) can perform sidelink transmission 404 within COT 400 using shared resources.

[0070] Reference numbers 406a, 406b, and 406c represent gaps between different sidelink transmissions. Type 2 channel access procedures, also known as "LBT Category 2 or LBT Cat.2 procedures," can be performed in some or all of these gaps. For example, UE2 may perform an LBT Cat.2 procedure in gap 406a before transmission on the transmission sidelink 403. LBT Cat.2 procedures differ from LBTCat.4 procedures and may require single-shot energy detection within a sensing interval of, for example, 16µs or at least 25µs. Due to single-shot sensing, the completion time of an LBT Cat.2 procedure is predictable. LBT Cat.2 procedures may also be referred to hereinafter as "single-shot LBT." More detailed procedures for Type 2 channel access procedures are specified in 3GPP standard specification TS 37.213.

[0071] In some embodiments of this disclosure, PSFCH transmissions in a COT initiated by a Tx UE may have the highest priority, such as the minimum CAPC value or the minimum priority level value. Therefore, PSFCH transmissions can always be allowed in a COT initiated by a Tx UE, regardless of the CAPC value or priority level value indicated in the SCI. For example, refer to... Figure 4Assuming a UE (referred to as "UE4" for simplicity) is an Rx UE originating from UE1 via sidelink transmission 401, UE4 can transmit HARQ-ACK feedback corresponding to sidelink transmission 401. HARQ-ACK feedback can be carried on PSFCH transmission 405, which is associated with the lowest CAPC value or lowest priority level value among a set of CAPC values. PSFCH transmission 405 is always allowed to be transmitted in COT 400 due to its highest priority.

[0072] In some embodiments of this disclosure, when the gap between the end symbol of the last-side link data transmission (e.g., PSSCH) in the COT initiated by the Tx UE and the start symbol of the PSFCH transmission is shorter than the minimum time (e.g., 16µs) for a single LBT, the Rx UE can directly transmit the PSFCH transmission without performing a single LBT. For example, refer to Figure 4 ,when Figure 4 When the gap 406c in the middle is shorter than 16us, UE4 can transmit PSFCH transmission 405 immediately after transmitting 404 on the side link.

[0073] In some embodiments of this disclosure, when the gap between the end symbol of the last-side link data transmission (e.g., PSSCH) in the COT initiated by the Tx UE and the start symbol of the PSFCH transmission is equal to the minimum time (e.g., 16µs) for a single LBT, the Rx UE can transmit the PSFCH transmission after a successful single LBT with a 16µs sensing interval. For example, refer to... Figure 4 ,when Figure 4 When the gap 406c is equal to 16us, UE4 can perform a single LBT with a 16us sensing interval in the gap 406c, and can transmit PSFCH transmission 405 after a successful single LBT.

[0074] In some embodiments of this disclosure, when the gap between the end symbol of the last-side-link data transmission (e.g., PSSCH) in the COT initiated by the Tx UE and the start symbol of the PSFCH transmission is greater than the minimum time for a single LBT (e.g., 16 µs), the Rx UE may transmit the PSFCH transmission after a successful single LBT with, for example, a sensing interval of at least 25 µs. For example, referring to... Figure 4 ,when Figure 4 When the gap 406c is greater than 16us, UE4 can perform a single LBT with a sensing interval of 25us in the gap 406c, and can transmit PSFCH transmission 405 after a successful single LBT.

[0075] Return to reference Figure 2In some embodiments of this disclosure, the CAPC value used to initiate COT may be indicated in the SCI transmitted by UE1, allowing other UEs (e.g., UE2) to determine whether they are permitted to use the shared resources. For example, UE2 may receive the SCI transmitted by UE1. UE2 may determine the CAPC value (hereinafter referred to as the "second CAPC value") based on the priority level value (hereinafter referred to as the "second priority level value") of the sidelink data to be transmitted by UE2. When the second CAPC value is less than or equal to the CAPC value used to initiate COT (hereinafter referred to as the "first CAPC value"), UE2 may be permitted to transmit sidelink data in the shared resources. UE2 may then perform sidelink transmission on the shared resources. The sidelink transmission may include at least one of HARQ-ACK feedback transmission, SCI transmission, and PSSCH transmission and may be specified for any UE, including UE1 that initiated COT. Otherwise, when the second CAPC value is greater than the first CAPC value, UE2 may not be permitted to transmit sidelink data in the shared resources. Alternatively, upon receiving the first CAPC value in the SCI, the UE2 can select sidelink data with a corresponding CAPC value that is less than or equal to the first CAPC value, thereby allowing the selected sidelink data to be transmitted in the shared resources of the COT.

[0076] In some embodiments of this disclosure, a priority value corresponding to the CAPC value used to initiate COT may be indicated in the SCI transmitted by UE1, allowing other UEs (e.g., UE2) to determine whether they are permitted to use shared resources. For example, UE2 may determine whether a second priority value for sidelink data to be transmitted by UE2 is less than or equal to the priority value upon which the first CAPC value is based (hereinafter referred to as the "first priority value"). When the second priority value is less than or equal to the first priority value, UE2 may transmit the sidelink data in the shared resources. Otherwise, when the second priority value is greater than the first priority value, UE2 may not be permitted to transmit the sidelink data in the shared resources. Alternatively, upon receiving the first priority value in the SCI, UE2 may select sidelink data with a corresponding priority value less than or equal to the first priority value, such that the selected sidelink data is permitted to be transmitted in the shared resources of COT.

[0077] In some embodiments of this disclosure, the sidelink data transmitted by UE2 may correspond to multiple priority level values. Since each priority level value may correspond to a CAPC value, the sidelink data transmitted by UE2 may correspond to multiple CAPC values. In some embodiments of this disclosure, the second priority level value may be the largest of the multiple priority level values. The second CAPC value may be the largest of the multiple CAPC values.

[0078] In some embodiments of this disclosure, multiple UEs may determine that they are permitted to use shared resources. In certain environments, such as when multiple UEs simultaneously execute a single LBT procedure to compete for shared resources, transmission conflicts may occur. To avoid this conflict, more constraints can be applied to COT sharing scenarios. For example, in some embodiments of this disclosure, only COTs initiated for unicast transmission can be shared with other UEs. In some embodiments of this disclosure, several Rx UEs whose sidelink transmissions are transmitted only by UE1 are permitted to use shared resources. For example, only several UEs with a destination identifier (ID) included in the SCI transmitted by UE1 can use shared resources. In some embodiments of this disclosure, several Rx UEs whose COTs are initiated only for unicast transmissions and whose sidelink transmissions are transmitted only by UE1 are permitted to use shared resources.

[0079] A UE wishing to share a COT initiated by itself may need to indicate shared resources within the COT to other UEs so that the shared resources can be identified by the other UEs. In some embodiments of this disclosure, the shared resources within the COT may be indicated by the start position and duration of the shared resources. In some instances, both the start position and duration of the shared resources may be indicated in the SCI transmitted by the UE initiating the COT. In some instances, one of the start position and duration of the shared resources may be indicated in the SCI transmitted by the UE initiating the COT, and the other may be configured by higher-layer (e.g., Radio Resource Control (RRC)) signaling. In some instances, both the start position and duration of the shared resources may be configured by higher-layer (e.g., RRC) signaling.

[0080] The start position of the shared resource (denoted by X) can be in time slots or symbols. In some instances, the start position can be indicated by the time slot-level offset between the time slot transmitting the SCI and the time slot in which the shared resource begins. In some instances, the start position can be indicated by the symbol-level offset between the end symbol transmitted on the Physical Side Link Shared Channel (PSSCH) scheduled by the SCI and the start symbol in which the shared resource begins. The duration (denoted by Y) can be in time slots or symbols. In some instances, assuming that both X and Y are indicated in time slots, then for an SCI transmitted in time slot n, it implies that the shared resource starts from time slot n+X to time slot n+X+Y-1 or from time slot n+X+1 to time slot n+X+Y.

[0081] Candidate values ​​for X can include 0, 1, 2, 3, ..., etc. Candidate values ​​for Y can include 1, 2, 3, ..., etc. The maximum values ​​of X and Y can depend on the MCOT associated with the CAPC value and the subcarrier spacing (SCS) value of the carrier.

[0082] Table 5 below shows exemplary maximum number of time slots in different MCOTs based on different SCSs. It should be understood that Table 5 below is for illustrative purposes only and should not be construed as limiting the embodiments of this disclosure.

[0083] Table 5: Maximum number of time slots in SCS-based MCOT

[0084]

[0085] Assuming the UE operates on a carrier with a 15kHz SCS and initiates a COT, which is equal to a 10ms MCOT, according to Table 5 above, the maximum number of time slots in the COT can be 10 time slots. In some instances, it is assumed that both X and Y are indicated in time slots. Since at least one (or a portion of) of the 10 time slots in the COT can be used by the UE for sidelink transmission, the value of X can be in the range of 1 to 9, and the value of Y can also be in the range of 1 to 9. The required number of bits to indicate X or Y can be based on... Confirmed, among which It is the vertex function, and N is the maximum value of X or Y. In the example above (N=9), the number of bits required to indicate X or Y can be 6.

[0086] From the perspective of the UE initiating and sharing COT, as a principle, the duration of resources used by the UE and shared resources should not exceed the MCOT determined based on the corresponding CAPC value. In some embodiments of this disclosure, to reduce signaling overhead, the values ​​of X and Y may be limited to two corresponding sets, rather than any values ​​satisfying the above principle. In some instances, a set of candidate values ​​for X may be configured by higher-layer (e.g., RRC) signaling or predefined at the UE. The UE may select a value for X from a set of candidate values ​​for X. Similarly, a set of candidate values ​​for Y may be configured by higher-layer (e.g., RRC) signaling or predefined at the UE. The UE may select a value for Y from a set of candidate values ​​for Y.

[0087] Figure 5 This describes an exemplary UE-initiated COT 500 according to some embodiments of this disclosure. Figure 5 In this example, it is assumed that shared resources within COT 500 are indicated in units of time slots. That is, the start position (X) and duration (Y) of the shared resource are indicated in units of time slots. The details described in all the foregoing embodiments of this disclosure are applicable to... Figure 5 The embodiments shown in the figure.

[0088] The UE (UE1) can initiate COT 500 to transmit data after successfully executing the channel access procedure. COT 500 can begin in time slot n and end in time slot n+4. For example... Figure 5As shown, the last time slot (slot n+4) in COT 500 is not entirely contained within COT 500. In some other embodiments of this disclosure, the last time slot in COT 500 may be entirely contained within COT 500.

[0089] UE1 can transmit sidelink transmission 501 and sidelink transmission 502 within COT 500. Each of sidelink transmission 501 and sidelink transmission 502 may contain a corresponding SCI and associated data scheduled by the SCI. Reference number 504 indicates a gap in which a type 2 channel access procedure can be executed.

[0090] UE1 can determine whether to share subsequent time resources within COT 500 with other UEs for sidelink transmission. Because in Figure 5 In this example, assuming the value of Y is indicated in slots and the last slot (slot n+4) in COT 500 is not fully contained within COT 500, then resource 503 in slot n+4 within COT 500 cannot be shared with other UEs. For example, UE1 may determine to share resource 505 from slot n+2 to slot n+3 with other UEs. Resource 503 may be used by UE1 for additional sidelink transmissions (e.g., SCI and associated PSSCH transmissions), or by (several) Rx UEs for PSFCH transmissions, or may be relinquished by UE1.

[0091] In some embodiments of this disclosure, both the value of X and the value of Y can be indicated in the SCI transmitted by the UE. The values ​​of X and Y can be indicated jointly or separately in the SCI. For example, the values ​​of X and Y can be indicated in one field (e.g., via a Resource Indication Value (RIV)) or two separate fields in the SCI. In these embodiments, the value of X can be updated by the UE slot-by-slot in different SCIs indicating the same shared resource. Although different values ​​of X can be indicated in several consecutive SCIs indicating the same shared resource, they can point to the same starting position of the shared resource. On the other hand, the value of Y in several consecutive SCIs is the same. For example, referring to... Figure 5 The SCI (hereinafter "SCI1") transmitted in side link transmission 501 (time slot n) can indicate X=2 and Y=2, which suggests that the shared resource is located in time slots n+2 to n+3. The SCI (hereinafter "SCI2") transmitted in side link transmission 502 (time slot n+1) can indicate X=1 and Y=2, which also suggests that the shared resource is located in time slots n+2 to n+3.

[0092] In some embodiments of this disclosure, fields indicating a joint reference to X and Y, or fields indicating a reference to Y only, may be set to invalid in the SCI. In some instances, the value of Y may be set to a non-numeric value or 0. This may indicate that time slot n+X will not be shared. Non-numeric values ​​may have an enumeration type. For example, the values ​​of X or Y may be enumerated as {invalid, 1, 2, ...}, {not applicable, 1, 2, ...}, or {invalid / not applicable, 1, 2, ...}.

[0093] In some embodiments of this disclosure, the value of X may be configured by higher-layer (e.g., RRC) signaling, and the value of Y may be indicated in the SCI transmitted by the UE. When the UE transmits an SCI in slot n and determines that slot n+X will not be shared, the UE may set the value of Y in the SCI to invalid to indicate that slot n+X will not be shared. For example, the value of Y may be set to a non-numeric value or 0. When the UE transmits an SCI in slot n and determines that slots n+X to n+X+Y-1 will be shared, the UE may set the value of Y in the SCI to a valid value (e.g., 2) to indicate that slots n+X to n+X+Y-1 will not be shared. In some cases, the UE may transmit multiple SCIs, and the value of X may refer to the offset between the slot of a specific SCI (e.g., the first SCI) transmitted among the multiple SCIs and the slot where the shared resource begins.

[0094] In some embodiments of this disclosure, the value of Y may be configured by higher-layer (e.g., RRC) signaling, and the value of X may be indicated in an SCI transmitted by the UE. The value of X may be updated by the UE on a slot-by-slot basis in different SCIs indicating the same shared resource. In some embodiments of this disclosure, X may be set to invalid in the SCI. In some instances, the value of X may be set to a non-numeric value or 0. This may instruct the UE to determine that COT is not shared.

[0095] Figure 6 This describes an exemplary UE-initiated COT 600 according to some embodiments of this disclosure. Figure 6 In this example, it is assumed that the starting position (X) of the shared resource within COT 600 is indicated in timeslots and the duration (Y) of the shared resource within COT 600 is indicated in symbols. Details described in all the foregoing embodiments of this disclosure are applicable to... Figure 6 The embodiments shown in the figure.

[0096] Figure 6 The examples shown can further improve channel resource utilization, which will be explained in the following text.

[0097] The UE (UE1) can initiate COT 600 to transmit data after successfully executing the channel access procedure. COT 600 can begin in time slot n and end in time slot n+4. For example... Figure 6 As shown, the last time slot (slot n+4) in COT 600 is not entirely contained within COT 600. In some other embodiments of this disclosure, the last time slot in COT 600 may be entirely contained within COT 600.

[0098] UE1 can transmit sidelink transmission 601 and sidelink transmission 602 within COT 600. Each of sidelink transmission 601 and sidelink transmission 602 may contain a corresponding SCI and associated data scheduled by the SCI. Reference number 604 indicates a gap in which a type 2 channel access procedure can be executed.

[0099] UE1 can determine whether to share subsequent time resources within COT 600 with other UEs for sidelink transmission. Because in Figure 6 In this example, assuming the value of Y is indicated in signs, although the last time slot (time slot n+4) in COT 600 is not fully contained within COT 600, the resources in time slot n+4 within COT 600 can be shared with other UEs. For example, UE1 can determine to share resources 606 that occupy portions of time slots n+2, n+3, and n+4 with other UEs.

[0100] In some embodiments of this disclosure, a set of candidate values ​​for Y in symbol units may be configured by higher-layer (e.g., RRC) signaling or predefined. The values ​​of Y in symbol units may be configured by higher-layer (e.g., RRC) signaling and / or dynamically indicated in the SCI transmitted from UE1.

[0101] Figure 7 This describes an exemplary UE-initiated COT 700 according to some embodiments of this disclosure. Figure 7 In this example, it is assumed that the start position (X) and duration (Y) of a shared resource within COT 700 are indicated in symbols. In other words, the start position of a shared resource can be determined based on the symbol-level offset between the end symbol of the PSSCH scheduled by SCI and the start symbol of the shared resource.

[0102] Figure 7 The examples shown can further improve channel resource utilization, which will be explained in the following text. Details described in all the foregoing embodiments of this disclosure are applicable to... Figure 7 The embodiments shown in the figure.

[0103] The UE (UE1) can initiate COT 700 to transmit data after successfully executing the channel access procedure. COT 700 can begin in time slot n and end in time slot n+4. For example... Figure 7 As shown, the last time slot (slot n+4) in COT 700 is not entirely contained within COT 700. In some other embodiments of this disclosure, the last time slot in COT 700 may be entirely contained within COT 700.

[0104] UE1 can transmit sidelink transmissions 701 and 702 within COT 700. Each of sidelink transmissions 701 and 702 can contain a corresponding SCI and associated data scheduled by the SCI. Reference number 704 indicates a gap in which a type 2 channel access procedure can be executed.

[0105] UE1 can determine whether to share subsequent time resources within COT 700 with other UEs for sidelink transmission. Because in Figure 7 In this example, assuming the values ​​of X and Y are indicated in symbolic units, the starting position of shared resources is not necessarily the beginning of a time slot, and resources in time slot n+4 within COT 700 can be shared with other UEs. For example, UE1 can determine that it shares resources 707, which occupy portions of time slot n+1, time slot n+2, time slot n+3, and time slot n+4, with other UEs. Therefore, symbolic units are used in this example. Figure 7 In some instances, even if there are one or more symbols that are not used by UE1 because, for example, the side link transmission of UE1 is completed earlier than the last symbol in the time slot (e.g., symbol 13), the remaining symbols in the time slot can be shared with other UEs.

[0106] In some embodiments of this disclosure, a set of candidate values ​​for X, in symbol units, may be configured by higher-layer (e.g., RRC) signaling or predefined. The values ​​of X, in symbol units, may be configured by higher-layer (e.g., RRC) signaling and / or dynamically indicated in SCI transmitted from UE1.

[0107] Figure 3 A flowchart illustrating an exemplary procedure 300 for wireless communication according to some embodiments of the present disclosure. Details described in all the foregoing embodiments of the present disclosure are applicable. Figure 3 The embodiments shown are illustrated in the image. The program can be provided by a UE (e.g., Figure 1 Execute on UE 110a, UE 110b or UE 110c.

[0108] Initially, based on the above regarding Figure 2In one of the described methods, the UE (UE1) may initiate a Channel Access Control (COT) to transmit data after performing a channel access procedure (e.g., a Type 1 channel access procedure) using a CAPC value. For example, the CAPC value (CAPC#1) may be determined from a set of CAPC values ​​based on a data priority level value (priority level value #1). The UE1 may then perform a sidelink transmission to transmit a Service Content Controller (SCI) and associated data within the COT. The SCI may contain COT-related information, such as information indicating shared resources within the COT initiated by the UE1. The SCI may be based on the information described above regarding... Figure 2 and 4 The method described in section 7 is used to determine this.

[0109] refer to Figure 3 In operation 311, another UE (UE2) can receive SCIs transmitted from UE1. UE2 can transmit (several) Rx UEs for UE1's sidelinks and monitor any other UEs transmitting SCIs from UE1 in the SCI resource set area. UE2 can identify shared resources within the COT initiated by UE1 based on the SCIs. UE2 can, according to the above regarding... Figure 2 One of the described methods determines a CAPC value (CAPC#2) associated with the sidelink data to be transmitted. For example, CAPC#2 may be determined from a set of CAPC values ​​based on the priority level value (priority level value #2) of the sidelink data to be transmitted.

[0110] In some embodiments of this disclosure, the SCI may indicate CAPC#1. UE2 may compare CAPC#2 with CAPC#1. When CAPC#2 is less than or equal to CAPC#1, UE2 may perform a channel access procedure (e.g., a type 2 channel access procedure) in operation 313 (indicated by the dashed box as an option). When the channel access procedure is successful, UE2 may transmit sidelink data in shared resources within the COT in operation 315 (indicated by the dashed box as an option). UE2 may also transmit the SCI in shared resources within the COT. The SCI transmitted by UE2 may schedule a PSSCH carrying sidelink data.

[0111] In some embodiments of this disclosure, the SCI may indicate a priority level value #1. UE2 may compare the priority level value #2 with the priority level value #1. When the priority level value #2 is less than or equal to the priority level value #1, UE2 may perform a channel access procedure (e.g., a type 2 channel access procedure) in operation 313 (indicated by the dashed box as an option). When the channel access procedure is successful, UE2 may transmit sidelink data in shared resources within the COT in operation 315 (indicated by the dashed box as an option). UE2 may also transmit the SCI in shared resources within the COT. The SCI transmitted by UE2 may schedule a PSSCH, which carries sidelink data.

[0112] In some embodiments of this disclosure, UE2 can be any UE monitoring SCI transmitted by UE1 in the SCI resource set area. The SCI and associated sidelink data transmitted by UE2 can be designated for any UE, including UE1 that initiated COT. UE2 can also transmit HARQ-ACK feedback in shared resources within the COT initiated by UE1.

[0113] In some embodiments of this disclosure, UE2 is an Rx UE for sidelink transmissions of UE1. For example, the SCI transmitted by UE1 may indicate the destination identifier (ID) of UE2. Sidelink data transmitted by UE2 in shared resources within the COT may include HARQ-ACK feedback corresponding to the sidelink transmissions transmitted by UE1. The HARQ-ACK feedback may be associated with the minimum CAPC value or the minimum priority level value in a set of CAPC values.

[0114] In some embodiments of this disclosure, UE2 may receive RRC signaling from a BS or Tx UE (e.g., UE1). In some embodiments of this disclosure, the RRC signaling may indicate a set of CAPC values, a set of candidate values ​​for the start position of a shared resource within the COT, a set of candidate values ​​for the duration of the shared resource, or any combination thereof. In some embodiments of this disclosure, the RRC signaling may indicate the start position of a shared resource within the COT or the duration of a shared resource within the COT. In some embodiments of this disclosure, UE2 may identify shared resources within the COT based on the RRC signaling and SCI.

[0115] Those skilled in the art should understand that the sequence of operations in exemplary procedure 300 can be changed and some operations in exemplary procedure 300 can be eliminated or modified without departing from the spirit and scope of this disclosure.

[0116] Figure 8 Example block diagrams illustrating a device 800 according to some embodiments of the present disclosure.

[0117] like Figure 8 As shown in the diagram, device 800 may include at least one non-transitory computer-readable medium ( Figure 8 (not described in the text), receiving circuit system 802, transmitting circuit system 804, and coupled to the non-transitory computer-readable medium ( Figure 8 (Not specified in the text) Processor 806 of receiving circuit system 802 and transmitting circuit system 804. Device 800 can be BS or UE.

[0118] Although elements such as processor 806, transmission circuitry system 804, and receiver circuitry system 802 are depicted in the singular form in this figure, the plural form is considered unless explicitly stated to be limited to the singular. In some embodiments of this disclosure, receiver circuitry system 802 and transmission circuitry system 804 are combined into a single device, such as a transceiver. In some embodiments of this disclosure, device 800 may further include input devices, memory, and / or other components.

[0119] In some embodiments of this disclosure, a non-transitory computer-readable medium may store computer-executable instructions thereon that cause a processor to perform operations relating to the UE described above. For example, the computer-executable instructions, when executed, cause processor 806 to interact with receiver circuitry 802 and transmitter circuitry 804 to perform operations relating to the UE. Figures 1 to 7 The steps of the UE are described in the text.

[0120] In some instances, processor 806 can execute a channel access procedure based on a CAPC value to initiate a COT for data transmission. The CAPC value can be determined from a set of CAPC values ​​based on the data's priority level. Transmission circuitry 804 can transmit a SCI within the COT. The SCI can indicate subsequent time resources within the COT that are available for sidelink transmission.

[0121] In some instances, the receiver circuitry 802 may receive an SCI, which may indicate subsequent time resources within the COT available for sidelink transmission. The COT may be initiated by the UE to transmit data after the UE performs a channel access procedure using a CAPC value. The CAPC value may be determined from a set of CAPC values ​​based on the priority level of the data to be transmitted by the UE.

[0122] In some embodiments of this disclosure, a non-transitory computer-readable medium may store computer-executable instructions that cause a processor to perform the methods of the BS described above. For example, when executed, the computer-executable instructions cause processor 806 to interact with receiving circuitry system 802 and transmitting circuitry system 804 to perform the methods of the BS described above. Figures 1 to 7 The steps of the BS are described in the diagram. For example, the transmission circuit system 804 may transmit to the UE a set of CAPC values, a set of candidate values ​​for the start position of the shared resource, a set of candidate values ​​for the duration of the shared resource, or any combination thereof. The transmission circuit system 804 may transmit to the UE the start position of the shared resource within the COT or the duration of the shared resource within the COT.

[0123] Those skilled in the art will understand that the steps of the methods described in connection with the aspects disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or a combination of both. The software module may reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art. Furthermore, in some aspects, the steps of the method may reside as one or any combination or set of code and / or instructions on a non-transitory computer-readable medium that can be incorporated into a computer program product.

[0124] Although this disclosure has been described with reference to specific embodiments thereof, it will be apparent to those skilled in the art that many alternatives, modifications, and variations will be readily apparent. For example, various components of the embodiments may be interchanged, added, or substituted in other embodiments. Moreover, not all elements of each figure are essential to the operation of the disclosed embodiments. For example, those of ordinary skill in the art of the disclosed embodiments will be able to make and use the teachings of this disclosure by simply employing the elements of the independent claims. Therefore, the embodiments of this disclosure set forth herein are intended to be illustrative rather than restrictive. Various changes may be made without departing from the spirit and scope of this disclosure.

[0125] In this document, the term "includes / including" or any other variation thereof is intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but may also include other elements not expressly listed or inherent to the process, method, article, or apparatus. Elements beginning with "a / an" or the like do not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes said element, unless further constraints are imposed. Furthermore, the term "another" is defined as at least one second or more. As used herein, the terms "having" and the like are defined as "includes".

Claims

1. A first user equipment (UE) for wireless communication, comprising at least one processor configured such that the first UE: A channel access priority category (CAPC) value is determined for executing a channel access procedure for transmitting data, wherein the data corresponds to a plurality of CAPC values, and the CAPC value is the largest of the plurality of CAPC values; Based on the CAPC value, a channel access procedure is executed to initiate the channel occupancy time (COT) to transmit the data; as well as Sidelink control information (SCI) is transmitted within the COT, wherein the SCI indicates the CAPC value and subsequent time resources within the COT that can be used for sidelink transmission, and wherein the subsequent time resources are indicated in time slots.

2. The first UE according to claim 1, wherein the at least one processor is configured such that the first UE: The sidelink transmission is received in the subsequent time resources, wherein the sidelink transmission includes at least one of hybrid automatic repeat request acknowledgment (HARQ-ACK) feedback transmission, SCI transmission, and physical sidelink shared channel (PSSCH) transmission.

3. The first UE according to claim 1, wherein each of the plurality of CAPC values ​​is associated with a set of channel access parameters and corresponds to a corresponding data priority level value.

4. The first UE according to claim 1, wherein at least one of the plurality of CAPC values ​​corresponds to two or more data priority level values.

5. The first UE according to claim 1, wherein each of the plurality of CAPC values ​​is derived from Radio Resource Control (RRC) signaling configuration or a predefined set of CAPC values.

6. The first UE according to claim 1, wherein the data corresponds to a plurality of priority level values, and the CAPC value corresponds to the maximum priority level value among the plurality of priority level values.

7. The first UE according to claim 1, wherein the COT is activated for unicast transmission.

8. The first UE according to claim 1, wherein the SCI indicates the start position of the subsequent time resource and the duration of the subsequent time resource.

9. The first UE according to claim 1, wherein the SCI indicates the duration of the subsequent time resource, and the starting position of the subsequent time resource is configured by Radio Resource Control (RRC) signaling.

10. The first UE of claim 1, wherein the SCI indicates the start position of the subsequent time resource, and the duration of the subsequent time resource is configured by radio resource control (RRC) signaling.

11. The first UE according to any one of claims 8 to 10, wherein the starting position of the subsequent time resource is indicated by: The slot-level offset of the subsequent time resource between the time slot for transmitting the SCI and the time slot in which the subsequent time resource begins.

12. The first UE of claim 11, wherein the slot-level offset is derived from a set of level offset values, and the set of level offset values ​​is configured or predefined by Radio Resource Control (RRC) signaling.

13. The first UE of claim 1, wherein the duration of the subsequent time resource is derived from a set of duration values, and the set of duration values ​​is configured by Radio Resource Control (RRC) signaling or predefined.

14. A second user equipment (UE) for wireless communication, comprising at least one processor configured to cause the second UE to: Receive first side link control information (SCI) from the first UE, wherein: The first SCI indicates the first channel access priority category (CAPC) value and the subsequent time resources within the channel occupancy time (COT) available for sidelink transmission, wherein the subsequent time resources are indicated in time slots. The COT is initiated by the first UE after executing the first channel access procedure using the first CAPC value to transmit the first data, and The first data corresponds to a first plurality of CAPC values, and the first CAPC value is the largest among the first plurality of CAPC values.

15. The second UE of claim 14, wherein the at least one processor is configured such that the second UE: The second CAPC value associated with the sidelink data to be transmitted by the second UE is compared with the first CAPC value; When the second CAPC value is less than or equal to the first CAPC value, the second channel access procedure is executed; and When the second channel access procedure is successful, the sidelink data is transmitted in the subsequent time resources.

16. The second UE according to claim 15, wherein the second CAPC value is determined from a set of CAPC values ​​based on a second priority level value of the sidelink data, and each CAPC value in the set of CAPC values ​​is associated with a set of channel access parameters and corresponds to a corresponding data priority level value.

17. The second UE according to claim 16, wherein at least one of the set of CAPC values ​​corresponds to two or more data priority level values.

18. The second UE according to claim 15, wherein the sidelink data corresponds to a second plurality of CAPC values, and the second CAPC value is the largest of the second plurality of CAPC values.

19. The second UE of claim 15, wherein the sidelink data includes a hybrid automatic repeat request acknowledgment (HARQ-ACK) feedback corresponding to data scheduled by the first SCI, and the HARQ-ACK feedback is associated with the minimum CAPC value or minimum priority level value in a set of CAPC values.

20. The second UE of claim 15, wherein the sidelink data is transmitted on a physical sidelink shared channel (PSSCH) scheduled by the second SCI, and the at least one processor is configured such that the second UE transmits the second SCI in the subsequent time resources.

21. The second UE according to claim 16 or 19, wherein the set of CAPC values ​​is configured by Radio Resource Control (RRC) signaling or is predefined.

22. The second UE of claim 14, wherein the COT is activated for unicast transmission.

23. The second UE of claim 14, wherein the first SCI further indicates the destination identifier ID of the second UE.

24. The second UE of claim 14, wherein the first SCI indicates the start position of the subsequent time resource and the duration of the subsequent time resource.

25. The second UE of claim 14, wherein the first SCI indicates the duration of the subsequent time resource, and the starting position of the subsequent time resource is configured by radio resource control (RRC) signaling.

26. The second UE of claim 14, wherein the first SCI indicates the start position of the subsequent time resource, and the duration of the subsequent time resource is configured by radio resource control (RRC) signaling.

27. The second UE according to any one of claims 24 to 26, wherein the starting position of the subsequent time resource is indicated by: The slot-level offset of the subsequent time resource between the time slot for transmitting the first SCI and the time slot in which the subsequent time resource begins.

28. The second UE of claim 27, wherein the slot-level offset is derived from a set of level offset values, and the set of level offset values ​​is configured or predefined by Radio Resource Control (RRC) signaling.

29. The second UE of claim 14, wherein the duration of the subsequent time resource is derived from a set of duration values, and the set of duration values ​​is configured or predefined by Radio Resource Control (RRC) signaling.

30. A method performed by a first user equipment (UE), the method comprising: A channel access priority category (CAPC) value is determined for executing a channel access procedure for transmitting data, wherein the data corresponds to a plurality of CAPC values, and the CAPC value is the largest of the plurality of CAPC values; Based on the CAPC value, a channel access procedure is executed to initiate the channel occupancy time (COT) to transmit the data; as well as Sidelink control information (SCI) is transmitted within the COT, wherein the SCI indicates the CAPC value and subsequent time resources within the COT that can be used for sidelink transmission, and the subsequent time resources are indicated in time slots.

31. A method performed by a second user equipment (UE), the method comprising: Receive first side link control information (SCI) from the first UE, wherein: The first SCI indicates the first channel access priority category (CAPC) value and the subsequent time resources within the channel occupancy time (COT) available for sidelink transmission, wherein the subsequent time resources are indicated in time slots. The COT is initiated by the first UE after executing the first channel access procedure using the first CAPC value to transmit the first data, and The first data corresponds to a first plurality of CAPC values, and the first CAPC value is the largest among the first plurality of CAPC values.

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