Method and apparatus of communication

Description

1 / 102 METHOD AND APPARATUS OF COMMUNICATION TECHNICAL FIELD

[001] This application relates to the field of communication and, in particular, to a method and apparatus for communication. BACKGROUND

[002] Using unlicensed spectrum can provide the end user with a higher service rate and a better user experience. Unlicensed spectrum is shared, meaning that any network device that complies with a specific regulation can use the spectrum to receive and send information. For better coexistence of network devices, all network devices need to use a listen-before-talk (LBT) mechanism. If a specific user device obtains a transmit opportunity via LBT, the time period for the user device corresponding to the information transmit opportunity will be called channel occupancy time (COT for short).After obtaining the COT, the user's equipment can share a spectrum resource with another user's equipment and send the shared resource in the COT, including a corresponding time domain position and a corresponding frequency domain position, to the other user's equipment. After receiving this sharing information and successfully performing listen-before-talk (LBT), the other user's equipment can use a specified frequency domain resource to send information at a specified time.

[003] User equipment on a side link uses a resource after it itself obtains COT via LBT or the resource is shared by the UE that obtains COT with the user equipment. However, currently, there is no related project for information indicating COT sharing of unlicensed spectrum resources on the side link, and Petition 870250108117, dated 11 / 26 / 2025, page 8 / 130 2 / 102 The normal implementation of a COT sharing mechanism cannot be guaranteed.

[004] Therefore, COT sharing needs to be implemented on a side link of an unlicensed frequency band according to a further design. SUMMARY

[005] This application provides a method and a communication device. According to the method, COT sharing of an unlicensed spectrum resource can be implemented on a side link.

[006] According to a first aspect, a method of communication is provided. The method may be implemented by a first terminal device, or it may be implemented by a chip or circuit configured in the first terminal device. This is not limited in this application. For ease of description, an example in which the method is implemented by the first terminal device is used below for description.

[007] The method includes: The first terminal device determines the first COT channel occupation time. The first terminal device determines to share a first resource based on a predefined priority threshold, where a time domain position of the first resource is in the first COT, and a data priority in the first resource is greater than or equal to the priority threshold. The first terminal device sends first indication information to at least one second terminal device, where the first indication information is to share the first COT, and the first indication information includes one or more of the priority threshold, resource information of the first COT, and sharing and licensing information of a PSFCH in the first COT.

[008] Alternatively, the method includes: The first terminal device determines the first COT channel occupation time. The first terminal device sends the first information of Petition 870250108117, dated 11 / 26 / 2025, page 9 / 130 3 / 102 indication for at least one second terminal device, where the first indication information is to share the first COT, the first indication information includes one or more of a priority threshold, resource information of the first COT and sharing and licensing information of a PSFCH in the first COT. The priority threshold is to determine a first resource, a position in the time domain of the first resource is in the first COT and a data priority in the first resource is greater than or equal to the priority threshold.

[009] COT sharing can be understood as the first terminal device indicating, based on the sharing indication information, that another terminal can use a resource on the first terminal device's COT.

[010] Optionally, the first terminal device can send the first indication information in a 1st slot in the first determined COT.

[011] Optionally, the first terminal device can send the first indication information in each slot in the first COT, and the first indication information can be different. In addition, when the first indication information is sent in different slots, the first indication information can be updated gradually.

[012] It should be understood that the first terminal device can determine a first shared terminal device across different protocol layers.

[013] As an example and not a limitation, the first terminal device may report the priority threshold to a Medium Access Control (MAC) layer at a physical layer, so that the MAC layer does not select a time-frequency resource whose priority is greater than the priority threshold when selecting a resource from an SA resource pool.

[014] As an example and not as a limitation, when carrying out the Petition 870250108117, dated 11 / 26 / 2025, page 10 / 130 4 / 102 Resource exclusion: The first terminal device can exclude reserved resources whose priorities are higher than the priority threshold and report this resource set and the SA resource set to the MAC layer. Finally, the MAC layer selects resources in a resource selection process and indicates to the physical layer to share the resources with other terminal devices.

[015] It should be understood that the previous solution is applicable to both multicast and unicast scenarios. This is not limited to this application.

[016] It should be understood that the LBT used by a terminal device in a channel access procedure is not limited in this embodiment of this application. For example, a first terminal may access a channel via LBT Type 1 or via LBT Type 2 (including 2A, 2B and 2C).

[017] It should be understood that a higher priority indicates a correspondingly lower priority value. For example, a priority whose priority value is 1 is higher than a priority whose priority value is 2.

[018] Optionally, the first COT resource information includes, but is not limited to, one or more of the following: a CACP channel access priority, a COT time domain start position, a COT duration, and a position of an RB set included in the COT in the frequency domain.

[019] It should be understood that the first COT resource information includes information about all or part of the resources in the first COT. This is not limited to this modality of this request.

[020] Based on the previous solution, after determining the first COT in the channel access procedure, the first terminal device can determine, based on the priority threshold, the first resource that can be shared with at least one second terminal device in the first COT and implicitly indicate, including the priority threshold in the first Petition 870250108117, dated 11 / 26 / 2025, page 11 / 130 5 / 102 indication information is sent to the second terminal device, indicating which second terminal device can use the shared COT, so that the second terminal device can determine, based on the priority of the data to be sent from the second terminal device and the priority threshold, whether the shared COT can be used. Compared to a method for indicating a specific location of a time-frequency resource, in this solution, only a priority threshold needs to be indicated, and no additional field overhead is required, to implement COT sharing of an unlicensed spectrum resource.

[021] With reference to the first aspect, in some implementations of the first aspect, before the first terminal device determines the first COT channel occupation time, the method also includes: The first terminal device receives a second indication information from the second terminal device, where the second indication information indicates a second resource, the second resource is a resource reserved by the second terminal device to send data, a time domain position of the second resource is in the first COT, and the first resource is included in the second resource.

[022] It should be understood that the second resource may be a plurality of resources reserved by a second terminal device, or the second resource may be a plurality of resources reserved by a plurality of second terminal devices. This is not limited in this embodiment of this application.

[023] It should be understood that some or all of these second resources may be first resources, that is, resources that the first terminal device may share in the first COT with one or more second terminal devices.

[024] It should be understood that the resources determined by the second terminal device as resources that can be used may be a part or all of the second resources, that is, the Petition 870250108117, dated 11 / 26 / 2025, page 12 / 130 6 / 102 resources that can be used by the second terminal device may be part or all of the reserved resources.

[025] Based on the previous solution, before determining the first COT, the first terminal device still receives the second indication information from the second terminal device and determines, after preemption of the first COT, that the second terminal device reserves the second resource in the first COT, so that the first terminal device can determine, from the second resource based on a priority of data to be sent in the second resource reserved by the second terminal device and the priority threshold, the first resource that can be shared with the corresponding second terminal device. This avoids a conflict between a terminal device reserving a resource and a terminal device anticipating the COT, and ensures fast access to high-priority service transmission to a channel and quality of service (QoS) of a high-priority service.

[026] With reference to the first aspect, in some implementations of the first aspect, the first indication information includes at least one first identifier, each first identifier is in a one-to-one correspondence with a second terminal device that reserves the first resource, and the first identifier indicates that a resource in the first COT is shared with a corresponding second terminal device.

[027] Optionally, the first identifier can be an additional ID.

[028] Optionally, the first identifier may be a COT sharing indication ID or a pair of COT sharing indication IDs.

[029] Optionally, the first identifier may be an additional ID pair. Each additional ID pair includes a service ID from the first terminal device and a UE ID from a second terminal device with which a Petition 870250108117, dated 11 / 26 / 2025, p. 13 / 130 7 / 102 resource is shared, or each additional ID pair includes the service ID of the first terminal device and an ID corresponding to a receiving service. The service ID is used by the UE with which a resource is shared to determine the UE of the initial COT to which data is sent on the shared resource.

[030] Based on the previous solution, the first indication information sent by the first terminal device to at least one second terminal device also includes at least one first identifier, and each first identifier corresponds to a second terminal device, and indicates that a resource in the first COT is shared with the second terminal device corresponding to the first identifier, so that the second terminal device that receives the first indication information can determine, based on the first identifier, whether a resource in the first COT can be used.

[031] With reference to the first aspect, in some implementations of the first aspect, a number of first identifiers is determined based on a number of second end devices that reserve the first resource.

[032] Based on the previous solution, the first terminal device determines the number of first identifiers based on whether the priority of the data to be sent in a reserved resource on the first COT is greater than the priority threshold. This can prevent the generation of a plurality of first identifiers indicating the same second terminal device, precisely control the number of first identifiers, and reduce overhead costs.

[033] With reference to the first aspect, in some implementations of the first aspect, the PSFCH sharing and licensing information on the first COT indicates a third terminal device to use the PSFCH resource on the first COT, the third terminal device is included in Petition 870250108117, dated 11 / 26 / 2025, p. 14 / 130 8 / 102 at least one second terminal device, and the third terminal device is at least one of the following: a data receiving device of the first terminal device; a terminal device corresponding to the first identifier; or a data receiving device of the terminal device corresponding to the first identifier.

[034] With reference to the first aspect, in some implementations of the first aspect, the PSFCH sharing and licensing information on the first COT is 1 bit and indicates a third terminal device to use the PSFCH resource on the first COT, and the third terminal device is included in at least one second terminal device. The third terminal device is a data receiving device for the first terminal device and / or a terminal device corresponding to the first identifier.

[035] With reference to the first aspect, in some implementations of the first aspect, the PSFCH sharing and licensing information in the first COT is a plurality of bits and indicates one of the following: indicate a third terminal device to use the PSFCH resource in the first COT, where the third terminal device is included in at least one second terminal device, and the third terminal device is a data receiving device of the first terminal device and / or a terminal device corresponding to the first identifier; indicate a data receiving device of a terminal device corresponding to the first identifier to use the PSFCH resource in the first COT; or indicate that the third terminal device cannot use the PSFCH resource in the first COT.

[036] It should be understood that the third terminal device may be replaced by a responding device, or the third terminal device may be any terminal device that receives the first indication message. Petition 870250108117, dated 11 / 26 / 2025, p. 15 / 130 9 / 102 This is not limited to this specific type of request.

[037] It should be understood that a PSFCH resource that is in the first COT and that is shared by the first terminal device with another terminal device for use may be all or part of the PSFCH resources in the first COT.

[038] It should be understood that a terminal device licensed to use a PSFCH resource in the first COT may determine and use, based on the sharing and licensing of PSFCH information and a PSSCH resource used by the terminal device, the PSFCH resource licensed for use.

[039] Based on the previous solution, the first terminal device can share a PSFCH resource that is in the COT and that is determined by the first terminal device with a specific terminal device, thus improving resource utilization and improving the overall performance of the side link communication system.

[040] With reference to the first aspect, in some implementations of the first aspect, the priority boundary is one of the following: a higher priority on at least one piece of data to be sent in the first COT; a lower priority of data to be sent in the first COT; or a priority of data sent in a 1a time unit of the first COT.

[041] Optionally, the priority threshold can be configured or pre-configured. For example, the priority threshold is a (pre-configured) priority threshold set for the first end device, or the priority threshold is a priority threshold set on a resource grouping.

[042] Optionally, the priority threshold may be a lower priority of reserved resources in first shared resources determined by the first terminal device in the first COT. Petition 870250108117, dated 11 / 26 / 2025, page 16 / 130 10 / 102

[043] Based on the previous solution, the first terminal device can determine the adjustment of a COT sharing strategy based on different priority thresholds, thus improving the flexibility of COT sharing.

[044] With reference to the first aspect, in some implementations of the first aspect, the first indication information is carried in side link control information SCI, or the first indication information is carried in a medium access control element MAC CE.

[045] It should be understood that the first indication information may be carried in a 1st stage SCI, or the first indication information may be carried in a 2nd stage SCI. This is not limited in this modality of this application.

[046] Based on the previous solution, the first terminal device can add the first indication information to the SCI or MAC CE, thus improving the flexibility of COT sharing.

[047] According to a second aspect, a method of communication is provided. The method may be implemented by a second terminal device, or it may be implemented by a chip or circuit configured in the second terminal device. This is not limited in this application. For ease of description, an example in which the method is implemented by the second terminal device is used below for description.

[048] The method includes: The second terminal unit receives the first indication information from a first terminal unit, where the first indication information indicates that the first COT channel occupation time is shared, and the first indication information includes one or more priority thresholds, resource information for the first COT channel occupation time, and sharing and licensing information for a PSFCH resource on the first COT. When the Petition 870250108117, dated 11 / 26 / 2025, page 17 / 130 11 / 102 The first indication information retains a priority threshold; the second terminal device determines to use a third resource based on the priority threshold, where a time domain position of the third resource is in the first COT, and a data priority in the third resource is greater than or equal to the priority threshold.

[049] Alternatively, the method includes: The second terminal device receives the first indication information from a first terminal device, where the first indication information indicates that the first COT channel occupation time is shared, and the first indication information includes one or more priority thresholds, resource information of the first COT channel occupation time, and sharing and licensing information of a PSFCH resource in the first COT. The priority threshold is to determine the use of a third resource, a position in the time domain of the third resource is in the first COT, and a data priority in the third resource is greater than or equal to the priority threshold.

[050] It should be understood that when the first indication information includes PSFCH sharing and licensing information, the second terminal device can determine, based on the PSFCH sharing and licensing information, whether the shared PSFCH resource can be used.

[051] It should be understood that a higher priority indicates a correspondingly lower priority value. For example, a priority whose priority value is 1 is higher than a priority whose priority value is 2.

[052] Optionally, the first COT resource information includes, but is not limited to, one or more of the following: a CACP channel access priority, a COT time domain start position, a COT duration, and a position of an RB set included in the COT in the frequency domain. Petition 870250108117, dated 11 / 26 / 2025, page 18 / 130 12 / 102

[053] It should be understood that the first COT resource information includes information about all or part of the resources in the first COT. This is not limited to this modality of this request.

[054] It must be understood that the third resource determined by the second terminal device for use is a resource that is determined by the first terminal device to share in the first COT and that is shared with another terminal device based on the first indication information.

[055] It should be understood that, after the second terminal device determines that the third resource in the first COT can be used, the second terminal device can use the third resource according to its own implementation.

[056] Optionally, after a shared time-frequency resource (i.e., the third resource) that can be used in the first COT is determined in a physical layer, the second terminal device can directly send a data packet in the time-frequency resource.

[057] Optionally, after a shared time-frequency resource (i.e., the third resource) that can be used in the first COT is determined in the physical layer, the second terminal device can report the shared resource to a MAC layer, indicate that the resource is a shared resource, and instruct the MAC layer to perform resource selection.

[058] Optionally, when using the third feature in the first COT, the second terminal device sends data to at least the first terminal device of the initial first COT in the third feature.

[059] Optionally, when the first indication information includes the channel access priority class (CAPC), the second terminal device may use the shared resource only when a data channel access priority class (CAPC) is to be used. Petition 870250108117, dated 11 / 26 / 2025, page 19 / 130 13 / 102 transmitted from the second terminal device is greater than the CAPC indicated in the first indication information.

[060] It must be understood that, after determining the third resource that can be used, the second terminal device needs to perform Type 2 channel access before using the shared resource, or needs to switch from Type 1 channel access to Type 2 channel access before using the shared resource.

[061] Based on the previous solution, the second terminal device can determine the priority of the data to be sent from the second terminal device and the priority threshold based on the priority threshold in the first indication information sent by the first terminal device and the priority of the data to be sent from the second terminal device, determine if the shared COT can be used, and determine the third resource that can be used. Compared to a method for indicating a specific location of a time-frequency resource, in this solution, only a priority threshold needs to be indicated, and no additional field overhead is required to implement COT sharing of an unlicensed spectrum resource.

[062] With reference to the second aspect, in some implementations of the second aspect, before the second terminal device receives the first indication information from the first terminal device, the method further includes: The second terminal device sends a second indication information to the first terminal device, where the second indication information indicates a second resource, the second resource is a resource reserved by the second terminal device to send data, a time domain position of the second resource is in the first COT, and the third resource is included in the second resource.

[063] It should be understood that the third resource may be part or all of the resources shared by the first device. Petition 870250108117, dated 11 / 26 / 2025, page 20 / 130 14 / 102 terminal, that is, the first terminal device can share resources in the first COT with one or more second terminal devices.

[064] It must be understood that third resources determined by the second terminal device as resources that can be used may be a part or all of the second resources, that is, the resources that can be used by the second terminal device may be a part or all of the reserved resources.

[065] Based on the previous solution, before receiving the first indication information, the second terminal device sends the second indication information to the first terminal device, so that the first terminal device can determine that the second terminal device reserves the second resource in the first COT, and the first terminal device can determine, from the second resource based on a data priority to be sent in the second resource reserved by the second terminal device and the priority threshold, the third resource that can be shared with the corresponding second terminal device. This avoids a conflict between a terminal device reserving a resource and a terminal device anticipating the COT, and ensures fast access for high-priority service transmission to a channel and QoS for a high-priority service.

[066] With reference to the second aspect, in some implementations of the second aspect, the first indication information includes a first identifier, and the first identifier indicates that a resource in the first COT is shared with the corresponding second terminal device.

[067] Optionally, the first identifier can be an additional ID.

[068] Optionally, the first identifier may be a COT sharing indication ID or a pair of COT sharing indication IDs. Petition 870250108117, dated 11 / 26 / 2025, p. 21 / 130 15 / 102

[069] Optionally, the first identifier may be an Additional ID pair. Each Additional ID pair includes a service ID of the first terminal device and a UE ID of the second terminal device with which a resource is shared, or each Additional ID pair includes the service ID of the first terminal device and an ID corresponding to a receiving service. The service ID is used by the UE with which a resource is shared to determine the initial COT UE to which data is sent on the shared resource.

[070] It should be understood that the second terminal device that receives the first indication information can determine, based solely on the first identifier, whether the second terminal device can use the reserved resource, or the second terminal device that receives the first indication information can determine, based on the first identifier corresponding to the second terminal device and the priority threshold in the first indication information, whether the second terminal device can use the reserved resource. This is not limited in this embodiment of this application.

[071] Optionally, the first indication information sent by the first terminal device to at least one second terminal device also includes at least one first pair of identifiers, and each first pair of identifiers is used by the second terminal device to determine whether the shared resource can be used.

[072] Based on the previous solution, the first indication information sent by the first terminal device to at least one second terminal device also includes at least one first identifier, and each first identifier corresponds to a second terminal device, and indicates that a resource in the first COT is shared with the second terminal device corresponding to the first identifier, so that Petition 870250108117, dated 11 / 26 / 2025, page 22 / 130 16 / 102 The second terminal device that receives the first indication information can determine, based on the first identifier, whether a resource in the first COT can be used.

[073] With reference to the second aspect, in some implementations of the second aspect, the PSFCH sharing and licensing information on the first COT is 1 bit or multibit and indicates the second terminal device to use the PSFCH resource on the first COT.

[074] Based on the previous solution, the first terminal device can share the PSFCH resource on the COT determined by the first terminal device with a specific terminal device. Correspondingly, the second terminal device that meets the condition can determine, from the indication information, that the second terminal device can use the PSFCH resource on the first COT to send feedback information, thus improving resource utilization and improving the overall performance of the side link communication system.

[075] With reference to the second aspect, in some implementations of the second aspect, the first indication information is carried in side link control information SCI, or the first indication information is carried in a medium access control element MAC CE. [07 6] It should be understood that the first indication information may be carried in a 1st stage SCI, or the first indication information may be carried in a 2nd stage SCI. This is not limited in this modality of this application.

[077] Based on the previous solution, the first terminal device can add the first indication information to the SCI or MAC CE, thus improving the flexibility of COT sharing.

[078] According to a third aspect, a method of communication is provided. The method may be carried out by a first terminal device, or it may be carried out by a chip or Petition 870250108117, dated 11 / 26 / 2025, page 23 / 130 17 / 102 a circuit configured on the first terminal device. This is not limited to this application. For ease of description, an example in which the method is performed by the first terminal device is used below for description.

[079] The method includes: The first terminal device determines the second COT channel occupancy time. The first terminal device sends a third indication information to at least one second terminal device, where the third indication information indicates a fourth shared resource, a time domain position of the fourth resource is in the second COT, the third indication information includes at least one RIV resource indication value and / or sharing and licensing information of a PSFCH in the second COT, and each RIV is in a one-to-one correspondence with each fourth resource. The RIV indicates a start time domain position t1 and a end time domain position t2 of the corresponding fourth resource; or the RIV indicates a start time domain position t1 and a length L of the corresponding fourth resource.

[080] Based on the previous solution, the first terminal device indicates, based on the resource indication value RIV, the time domain position of the shared resource on the second COT. Compared with a way of separately indicating a time domain position of a resource, in this solution, bit overheads can be effectively reduced. When the same SCI carries user information, in this solution, more UEs can be indicated to use the shared resource, thus improving resource utilization and improving the overall performance of the side-link communication system.

[081] With reference to the third aspect, in some implementations of the third aspect, before the first terminal device determines the second COT, the method also includes: The first terminal device receives fourth indication information from the second terminal device. The second piece of information Petition 870250108117, dated 11 / 26 / 2025, page 24 / 130 The 18 / 102 indication suggests a fifth resource; this fifth resource is reserved by the second terminal device for data transmission. A time domain position of the fifth resource is located in the second COT, and the fifth resource is included within the fourth resource.

[082] With reference to the third aspect, in some implementations of the third aspect, the third indication information includes at least a second identifier, each second identifier is in a one-to-one correspondence with a second terminal device that reserves the fourth resource, and the second identifier indicates that a resource in the second COT is shared with a corresponding second terminal device.

[083] With reference to the third aspect, in some implementations of the third aspect, a number of second identifiers is determined based on a number of second terminal devices that reserve the fourth resource.

[084] With reference to the third aspect, in some implementations of the third aspect, the PSFCH sharing and licensing information in the second COT is 1 bit and indicates whether a third terminal device can use the PSFCH feature in the second COT, and the third terminal device is included in at least one second terminal device. The third terminal device is a data receiving device of the first terminal device and / or a terminal device corresponding to the second identifier.

[085] With reference to the third aspect, in some implementations of the third aspect, the PSFCH sharing and licensing information on the second COT is a plurality of bits and indicates one of the following: indicating a third terminal device to use the PSFCH resource on the second COT, where the third terminal device is included in at least one second terminal device, and the third terminal device is a data receiving device of the first terminal device, and / or a second terminal device. Petition 870250108117, dated 11 / 26 / 2025, page 25 / 130 19 / 102 corresponding to the second identifier; indicate a data receiving device from a terminal device corresponding to the second identifier to use the PSFCH feature on the second COT; or indicate that the third terminal device cannot use the PSFCH feature on the second COT.

[086] It should be understood that the third terminal device may be replaced by a responding device, or the third terminal device may be any terminal device that receives the first indication message. This is not limited in this modality of this application.

[087] Based on the previous solution, the first terminal device can share a PSFCH resource that is in the COT and that is determined by the first terminal device with a specific terminal device, thus improving resource utilization and improving the overall performance of the side link communication system.

[088] With reference to the third aspect, in some implementations of the third aspect, when t2-t1<19, RIV=39(t2t1)+N+t1; or when 20 <t2-t1<39, RIV=39(39-t2+t1)+41+N-t1, onde 0<N<244.

[089] With reference to the third aspect, in some implementations of the third aspect, when L<19, RIV=39(L-1)+t11; or when 20 <L<39, RIV=39(40-L)+t1.

[090] Based on the previous solution, the first terminal device indicates, based on the resource indication value RIV, the time domain position of the shared resource on the second COT. In this solution, bit overheads can be effectively reduced. When the same SCI carries user information, more UEs can be indicated to use the shared resource, thus improving resource utilization and improving the overall performance of the side-link communication system.

[091] With reference to the third aspect, in some implementations of the third aspect, the third piece of information of Petition 870250108117, dated 11 / 26 / 2025, page 26 / 130 The 20 / 102 indication is carried in SCI side link control information, or the third indication information is carried in a CE medium access control element.

[092] It should be understood that the third indication information may be carried in a first-stage SCI, or the third indication information may be carried in a second-stage SCI. This is not limited in this modality of this application.

[093] Based on the previous solution, the first terminal device can add the third indication information to the SCI or MAC CE, thus improving the flexibility of COT sharing.

[094] According to a fourth aspect, a method of communication is provided. The method may be implemented by a second terminal device, or it may be implemented by a chip or circuit configured in the second terminal device. This is not limited in this application. For ease of description, an example in which the method is implemented by the second terminal device is used below for description.

[095] The method includes: The second terminal device receives a third indication piece of information, where the third indication piece of information is to share a fourth resource, and the third indication piece of information includes at least one resource indication value (RIV) and / or sharing and licensing information from a PSFCH in the second COT. The RIV indicates a time domain start position t1 and a time domain end position t2 of the fourth resource; or the RIV indicates a time domain start position t1 and a length L of the fourth resource. The second terminal device uses the fourth resource based on the third indication piece of information.

[096] Based on the previous solution, the second terminal device can indicate, based on the resource indication value RIV included in the third indication information by the first terminal device, the position in the time domain of the resource. Petition 870250108117, dated 11 / 26 / 2025, page 27 / 130 21 / 102 shared on the second COT. Compared with a way of separately indicating a time domain position of a resource, in this solution, bit overheads can be effectively reduced. When the same SCI carries user information, in this solution, more UEs can be indicated to use the shared resource, thus improving resource utilization and improving the overall performance of the side-link communication system.

[097] With reference to the fourth aspect, in some implementations of the fourth aspect, the PSFCH sharing and licensing information on the second COT is 1 bit or multibit and indicates the second terminal device to use the PSFCH feature on the second COT.

[098] Based on the previous solution, the first terminal device can share the PSFCH resource on the COT determined by the first terminal device with a specific terminal device. Correspondingly, the second terminal device that meets the condition can determine, from the indication information, that the second terminal device can use the PSFCH resource on the first COT to send feedback information, thus improving resource utilization and improving the overall performance of the side-link communication system.

[099] With reference to the fourth aspect, in some implementations of the fourth aspect, when t2-t1<19, RIV=39(t2t1)+N+t1; or when 20 <t2-t1<39, RIV=39(39-t2+t1)+41+N-t1, onde 0<N<244.

[100] With reference to the fourth aspect, in some implementations of the fourth aspect, when L<19, RIV=39(L-1)+t11; or when 20 <L<39, RIV=39(40-L)+t1.

[101] Based on the previous solution, the second terminal device can indicate, based on the resource indication value RIV included in the third indication information by the first terminal device, the position in the time domain of the resource. Petition 870250108117, dated 11 / 26 / 2025, page 28 / 130 22 / 102 shared on the second COT. In this solution, bit overheads can be effectively reduced. When the same SCI carries user information, more UEs can be designated to use the shared resource, thus improving resource utilization and improving the overall performance of the side-link communication system.

[102] With reference to the fourth aspect, in some implementations of the fourth aspect, the third indication information is carried in side link control information SCI, or the third indication information is carried in a medium access control element MAC CE.

[103] It should be understood that the third indication information may be carried in a first-stage SCI, or the third indication information may be carried in a second-stage SCI. This is not limited in this modality of this application.

[104] Based on the previous solution, the first terminal device can add the third indication information to the SCI or MAC CE, thus improving the flexibility of COT sharing.

[105] According to a fifth aspect, a method of communication is provided. The method may be implemented by a first terminal device, or it may be implemented by a chip or circuit configured in the first terminal device. This is not limited in this application. For ease of description, an example in which the method is implemented by the first terminal device is used below for description.

[106] The method includes: The first terminal device determines the occupation time of the third COT channel. The first terminal device sends a fifth indication information to at least one second terminal device, where the fourth indication information indicates a sixth shared resource, a time domain position of the sixth resource is in the third COT, the fifth indication information includes at least one indication value. Petition 870250108117, dated 11 / 26 / 2025, page 29 / 130 23 / 102 of resource RIV and / or sharing and licensing information of a PSFCH in the third COT, and each RIV is in a one-to-one correspondence with each sixth resource. The RIV indicates a frequency domain start position t1 and a frequency domain end position t2 of the corresponding sixth resource; or the RIV indicates a time domain start position t1 and a subchannel length L of the corresponding sixth resource.

[107] Optionally, the frequency domain position indicated by the first terminal device based on the RIV is two locations in a resource block set (RB set).

[108] Optionally, the frequency domain position indicated by the first terminal device based on the RIV is two absolute resource locations in all RB sets.

[109] Based on the previous solution, the first terminal device indicates, based on the RIV resource indication value, the frequency domain position of the shared resource on the third COT. Compared with a way of separately indicating a frequency domain position of a resource, in this solution, bit overheads can be effectively reduced. When the same SCI carries user information, in this solution, more UEs can be indicated to use the shared resource, thus improving resource utilization and improving the overall performance of the side-link communication system.

[110] According to a sixth aspect, a method of communication is provided. The method may be implemented by a second terminal device, or it may be implemented by a chip or circuit configured in the second terminal device. This is not limited in this application. For ease of description, an example in which the method is implemented by the second terminal device is used below for description.

[111] The method includes: The second terminal device receives the Petition 870250108117, dated 11 / 26 / 2025, page 30 / 130 24 / 102 fifth indication information, where the fifth indication information is for sharing a sixth resource, and the fifth indication information includes at least one resource indication value (RIV) and / or sharing and licensing information of a PSFCH in the third COT. The RIV indicates a time domain start position t1 and a time domain end position t2 of the sixth resource; or the RIV indicates a time domain start position t1 and a length L of the sixth resource. The second terminal device uses the sixth resource based on the fifth indication information.

[112] Optionally, the frequency domain position indicated by the first terminal device based on the RIV is two locations in an RB set.

[113] Optionally, the frequency domain position indicated by the first terminal device based on the RIV is two absolute resource locations in all RB sets.

[114] Based on the previous solution, the second terminal device can indicate, based on the resource indication value RIV included in the fourth indication information by the first terminal device, the time domain position of the shared resource on the third COT. Compared with a way of separately indicating a time domain position of a resource, in this solution, bit overheads can be effectively reduced. When the same SCI carries user information, in this solution, more UEs can be indicated to use the shared resource, thus improving resource utilization and improving the overall performance of the side-link communication system.

[115] According to a seventh aspect, a communication apparatus is provided and includes a transceiver unit and a processing unit, configured to support a communication device in performing the functions of the first terminal in the first aspect, in the third aspect, in the fifth Petition 870250108117, dated 11 / 26 / 2025, page 31 / 130 25 / 102 aspect and in the implementations of the corresponding aspects. The functions can be implemented by hardware or they can be implemented by hardware running corresponding software. The hardware or software includes one or more modules corresponding to the functions.

[116] According to an eighth aspect, a communication device is provided and includes a processor and a transceiver that are configured to support the communication device in performing corresponding functions in the previous method. The processor and the transceiver are connected by means of communication. The transceiver is configured to perform the sending / receiving of a specific signal under the control of the processor. The processor is configured to invoke instructions to implement the data transmission method in the first aspect, in the third aspect, in the fifth aspect and in the implementations of the corresponding aspects.

[117] According to a ninth aspect, a communication apparatus is provided and includes a transceiver unit and a processing unit, configured to support a communication device in performing the functions of the second terminal in the second aspect, in the fourth aspect, in the sixth aspect and in the implementations of the aspects. The functions may be implemented by hardware or may be implemented by hardware running corresponding software. Hardware or software includes one or more modules corresponding to the functions.

[118] According to a tenth aspect, a communication device is provided and includes a processor and a transceiver that are configured to support the communication device in performing corresponding functions in the previous method. The processor and the transceiver are connected by means of communication. The transceiver is configured to perform the sending / receiving of a specific signal under the control of the processor. The processor is configured to invoke instructions. Petition 870250108117, dated 11 / 26 / 2025, page 32 / 130 26 / 102 to implement the data transmission method in the second aspect, the fourth aspect, the sixth aspect, and the aspect implementations.

[119] According to an eleventh aspect, a communication system is provided. The communication system includes the communication device provided in the fifth or seventh aspect, and the communication device provided in the sixth or eighth aspect. The communication system may implement the data transmission method provided in any of the first to sixth aspects or the possible implementations of the first to sixth aspects.

[120] According to a twelfth aspect, a computer-readable storage medium is provided and configured to store a computer program. The computer program includes instructions for carrying out the method in any of the aspects from the first to the sixth aspect or the possible implementations of the first to the sixth aspect.

[121] According to a thirteenth aspect, a system chip is provided and includes a processing unit and a communication unit. For the processing unit, the processing unit can execute computer instructions to enable a chip in a terminal to perform the method in any of the first to sixth aspects or possible implementations of the first to sixth aspects.

[122] According to a fourteenth aspect, a computer program product is provided. The product includes instructions for carrying out the method in any of the aspects, from the first to the sixth, or the possible implementations of the first to the sixth.

[123] According to a fifteenth aspect, a communication apparatus is provided and includes a processor and a memory. The processor is configured to execute a computer program or instructions stored in memory, so that the communication apparatus performs the method in either of Petition 870250108117, dated 11 / 26 / 2025, p. 33 / 130 27 / 102 first aspect to sixth aspect or the possible implementations of the first aspect to the sixth aspect.

[124] According to a sixteenth aspect, a chip system is provided and includes a memory and a processor. The memory is configured to store a computer program, and the processor is configured to invoke the computer program from memory and rotate the computer program, to enable a communication device in which the chip system is installed to execute method instructions in any of the first to sixth aspects or possible implementations of the first to sixth aspects.

[125] The chip system may include an input circuit or interface for sending information or data and an output circuit or interface for receiving information or data. BRIEF DESCRIPTION OF THE DRAWINGS

[126] FIG. 1 is a diagram of a wireless communication system to which an embodiment of this application is applicable; FIG. 2 is a diagram of another wireless communication system to which an embodiment of this application is applicable; FIG. 3 is a diagram of a typical V2X scenario; FIG. 4 is a diagram of a slot in a communication resource cluster; FIG. 5 is a diagram of a bitmap indicating subframes available for SL communication; FIG. 6 is a diagram of a time-domain resource in a communication resource cluster; FIG. 7 is a diagram of subchannels at different granularities; FIG. 8 is a bitmap that indicates a PSFCH frequency domain feature; FIG. 9 is a diagram of a PSFCH time-domain resource corresponding to a PSSCH; FIG. 10 is a domain resource allocation diagram of Petition 870250108117, dated 11 / 26 / 2025, page 34 / 130 28 / 102 frequency PSFCH; FIG. 11 is a diagram of contiguous subchannels; FIG. 12 is a diagram indicating a time-frequency resource based on a TRIV and an FRIV; FIG. 13 is a diagram of a COT sharing scenario; FIG. 14 is a diagram of another COT sharing scenario; FIG. 15 is a diagram of a 100-side link COT sharing method according to one embodiment of this application; FIG. 16 is a diagram of a COT sharing scenario to which a method 100 is applicable according to a modality of this request; FIG. 17 is a diagram of another COT sharing scenario; FIG. 18 is a diagram of another COT sharing scenario; FIG. 19 is a diagram of a 200-side link COT sharing method according to an embodiment of this application; FIG. 20 is a diagram of a COT sharing scenario to which a 200 method is applicable according to a modality of this application; FIG. 21 is a diagram of another COT sharing scenario to which a 200 method is applicable according to a modality of this request; FIG. 22 is a diagram of a COT sharing scenario according to one modality of this request; FIG. 23 is a diagram of a method 300 for indicating idle symbol filling according to an embodiment of this application; FIG. 24 is a diagram of an indication scenario of Petition 870250108117, dated 11 / 26 / 2025, pp. 35 / 130 29 / 102 filling in the idle symbol according to a modality of this request; FIG. 25 is a block diagram of a wireless communication device according to an embodiment of this application; and FIG. 26 is a block diagram of a terminal device according to one embodiment of this application. DESCRIPTION OF THE MODALITIES

[127] The following describes technical solutions for this application with reference to attached drawings.

[128] The technical solutions in embodiments of this application can be applied to various communication systems, for example, a long-term evolution (LTE) system, an LTE frequency division duplex (FDD) system, an LTE time division duplex (TDD) system, a universal mobile telecommunications system (UMTS), a 5th generation (5G) or new radio (NR) system, a system evolved after 5G, such as a 6th generation (6G) system, and non-terrestrial network (NTN) communication systems, such as a satellite communication system and a satellite communication system. The satellite communication system includes a satellite base station and a terminal device. The satellite base station provides a communication service to the terminal device.A satellite base station can also communicate with a ground base station. A satellite can serve as a base station or as a terminal device. The satellite can be a non-terrestrial base station, a non-terrestrial device, or similar, for example, an unmanned aerial vehicle, a hot air balloon, a low Earth orbit satellite, a medium Earth orbit satellite, or a high Earth orbit satellite.

[129] The technical solutions in modalities of this application are Petition 870250108117, dated 11 / 26 / 2025, pp. 36 / 130 30 / 102 applicable to both homogeneous and heterogeneous network (Heterogeneous Network, HetNet) scenarios and impose no limitations on transmission points. The technical solutions can be applied to coordinated multipoint transmission between macro base stations, between micro base stations, and between a macro base station and a micro base station, and are applicable to both FDD and TDD systems. The technical solutions in embodiments of this application are applicable not only to low-frequency (sub-6G) scenarios but also to high-frequency (above 6 GHz), terahertz, optical communication, and similar scenarios. The technical solutions in embodiments of this application are applicable not only to communication between a network device and a terminal but also to communication between network devices, communication between terminals, vehicle internet communication, internet of things communication, industrial internet communication, and similar scenarios.

[130] The technical solutions in embodiments of this application may alternatively be applied to a scenario in which a terminal is connected to a single base station. The base station connected to the terminal and a core network (CN) connected to the base station are of the same standard. For example, if the CN is a 5G core, the base station will correspondingly be a 5G base station, and the 5G base station will be directly connected to the 5G core. Alternatively, if the CN is a 6G core, the base station will be a 6G base station, and the 6G base station will be directly connected to the 6G core. The technical solutions in embodiments of this application are also applicable to a dual connectivity (DC) scenario in which the terminal is connected to at least two base stations.

[131] The technical solutions in the modalities of this application also use a macro-micro scenario including different forms of base stations in a communication network. For example, the station Petition 870250108117, dated 11 / 26 / 2025, page 37 / 130 31 / 102 base can be a satellite, an air balloon station, an unmanned aerial vehicle station or similar. The technical solutions in embodiments of this application are also applicable to a scenario in which there are a wide-coverage base station and a narrow-coverage base station.

[132] It can also be understood that the technical solutions in embodiments of this application can be further applied to 5.5G, 6G and later wireless communication systems. Application scenarios include, but are not limited to, a terrestrial cellular communication scenario, an NTN scenario, a satellite communication scenario, a high altitude platform station (HAPS) communication scenario, a vehicle-to-everything (V2X) scenario, an integrated access and backhaul (IAB) scenario, a reconfigurable intelligent surface (RIS) communication scenario and the like.

[133] A terminal device in embodiments of this application may be a device with wireless transceiver function and may specifically be user equipment (UE), an access terminal, a subscriber unit, a subscriber station, a mobile station, a remote station, a remote terminal, a mobile device, a user terminal, a wireless communication device, a user agent or a user device. The terminal device may alternatively be a satellite phone, a mobile phone, a smartphone, a wireless data card, a wireless modem or a machine-type communication device, or it may be a cordless phone, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA), customer-premises equipment. Petition 870250108117, dated 11 / 26 / 2025, pp. 38 / 130 32 / 102 equipment (CPE), a smart point-of-sale (POS) machine, a portable device with wireless communication function, a computing device or other processing device connected to a wireless modem, a vehicle-mounted device, a communication device carried on a high-altitude aircraft, a wearable device, an unmanned aerial vehicle, a robot, a device-to-device (D2D) communication terminal, a V2X terminal, a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a wireless terminal in industrial control, a wireless terminal in self-driving, a wireless terminal in telemedicine, a wireless terminal in a smart grid, a wireless terminal in portation safety,A wireless terminal in a smart city, a wireless terminal in a smart home, a terminal device in a communication network evolved beyond 5G, or something similar. This is not limited to embodiments of this application. The terminal device in embodiments of this application may alternatively be a vehicle-mounted module, such as a roadside unit (RSU), a telematics box (T-Box), or an on-board unit (OBU), or it may be a chip.

[134] In embodiments of this application, a communication device configured to implement a function of the terminal device may be a terminal device, or it may be a device that can support the terminal device in implementing the function, for example, a chip system. The device may be installed in the terminal device or used in cooperation with the terminal device. In embodiments of this application, the chip system may include a chip, or it may include a chip and another discrete device. Petition 870250108117, dated 11 / 26 / 2025, pp. 39 / 130 33 / 102

[135] The network device in some embodiments of this application is a device with a wireless transceiver function and is configured to communicate with the terminal device. The access network device may be a node in a radio access network (RAN) and may be referred to as a base station or RAN node. The access network device may be an evolved NodeB (eNB or eNodeB) in LTE, a base station in a 5G network, for example, a gNodeB (gNB), a base station in an evolved public land mobile network (PLMN) after 5G, a broadband network gateway (BNG), an aggregation switch, a 3rd generation partnership project (3GPP) access device, or similar.For example, the RAN can be configured as an Open Radio Access Network (O-RAN), an Open Radio Access Network (O-RAN), or a Cloud Access Network (C-RAN) as defined in the 3GPP protocol.

[136] The network device in embodiments of this application may further include various forms of base stations, for example, a macro base station, a micro base station (also called a small cell), a relay station, a transmission reception point (TRP), a transmission point (TP), a mobile switching center, a device that performs a base station function in device-to-device (D2D), vehicle-to-everything (V2X) and machine-to-machine (M2M) communication, a network device in an NTN communication system and the like. This is not specifically limited in the embodiments of this application.

[137] The network device in embodiments of this application may also include a network element or a module that implements some base station functions, for example, including one or more of the following: a central unit (central unit, CU), a Petition 870250108117, dated 11 / 26 / 2025, pp. 40 / 130 34 / 102 distributed unit (DU) or radio unit (RU). Optionally, the CU can be separated into a control plane (CP) of CU and a user plane (UP) of CU. The functions of the CU and DU can be implemented by different network elements, or they can be implemented by a baseband unit (BBU) of the base station. A function of the RU can be implemented by a radio frequency device of the base station. For example, the radio frequency device of the base station can be a remote radio processing unit (RRU), a pico remote radio unit (pRRU), an active antenna processing unit (AAU), or another unit, module, or device with a radio frequency processing function.A communication interface protocol between the BBU and the radio frequency device can be a common public radio interface (CPRI) protocol, an enhanced common public radio interface (eCPRI) protocol, a fronthaul interface protocol between a DU and a RU in an O-RAN system, or similar. This is not limited to.

[138] In embodiments of this application, an apparatus configured to implement a function of the network device may be the network device, or it may be an apparatus that can support the network device in implementing the function, for example, a chip system. The apparatus may be installed in the network device or used in the network device. In embodiments of this application, the chip system may include a chip, or it may include a chip and another discrete device.

[139] FIG. 1 is a diagram of a wireless communication system to which an embodiment of this application applies. As shown in FIG. 1, the wireless communication system may include at least one network device, for example, a device Petition 870250108117, dated 11 / 26 / 2025, page 41 / 130 35 / 102 of network 110 shown in FIG. 1. The wireless communication system may also include at least one terminal device, for example, a terminal device 120 and a terminal device 130 shown in FIG. 1. A plurality of antennas may be configured for both the network device and the terminal device, and the network device and the terminal device may communicate with each other using a multi-antenna technology. The terminal devices may communicate directly with each other. A link for direct communication between the terminal devices may be called a sidelink (SL), and direct communication between the terminal devices may be called SL communication.

[140] When the network device communicates with the terminal device, the network device can manage one or more cells, and a cell can have a whole number of terminal devices. Optionally, network device 110 and terminal device 120 form a single-cell communication system. Without loss of generality, the cell is called cell #1. Network device 110 can be a network device in cell #1, or network device 110 can serve a terminal device (e.g., terminal device 120) in cell #1.

[141] It is worth noting that a cell can be understood as a coverage area of ​​a radio signal from the network device.

[142] FIG. 2 is a diagram of another wireless communication system to which an embodiment of this application is applicable. As shown in FIG. 2, this embodiment of this application can be applied to an SL communication scenario and support a communication scenario with network coverage and a communication scenario without network coverage. Scenarios shown in (a) to (c) in FIG. 2 are scenarios where UE 1 is within network coverage and a scenario shown in (d) in FIG. 2 is a scenario where both UE Petition 870250108117, dated 11 / 26 / 2025, page 42 / 130 36 / 102 as UE 2 are outside network coverage. In the scenarios shown in (a) to (c) in FIG. 2, UE 1 can communicate with UE 2 on a resource scaled by a network device, and the resource can be called a licensed resource or licensed frequency band; or UE 1 can select a resource from a grouping of resources through resource autoselection to communicate with UE 2, and the resource can be called an unlicensed resource or unlicensed frequency band. In the scenario shown in (d) in FIG. 2, since both UE 1 and UE 2 are outside network coverage, UE 1 and UE 2 can communicate through resource autoselection. The resource is a time-frequency resource.

[143] It should be understood that FIG. 1 and FIG. 2 are simplified example diagrams for ease of understanding. The wireless communication system may also include another network device or another terminal device that is not shown in FIG. 1 and FIG. 2. The embodiments of this application are applicable to any communication scenario in which a transmitting device communicates with a receiving device.

[144] To facilitate understanding of the modalities of this application, several basic concepts in modalities of this application are briefly described. It should be understood that the basic concepts described below are briefly described using basic concepts specified in a current protocol as an example, but the modalities of this application are not limited to being applied only to a currently existing system. Therefore, the names used when the currently existing system is used as an example for description are all functional descriptions, and specific names are not limited, they only indicate functions and can be correspondingly expanded to another system, for example, a 6G system or a future communication system. 1. Near-field communication interface (proximity) Petition 870250108117, dated 11 / 26 / 2025, page 43 / 130 37 / 102 communication, PC5).

[145] The work scenarios supported by cellular vehicle-to-everything (C-V2X) include a scenario with cellular network coverage and a scenario without cellular network deployment. C-V2X can provide two communication interfaces: a short-range direct communication interface (PC5) between a vehicle, a person, and a road, and a communication interface (Uu) between a terminal and a base station, which can implement reliable long-distance communication and a greater range. When a terminal device (such as a vehicle-mounted terminal, a smartphone, or a roadside unit) that supports CV2X is within cellular network coverage, the terminal device can use the Uu interface under the control of a cellular network. Regardless of whether there is network coverage, the terminal device can use the PC5 interface to perform V2X communication.The C-V2X combines the Uu interface and the PC5 interface to provide mutual support for V2X service transmission, forming effective redundancy to ensure communication reliability.

[146] As shown in FIG. 3, C-V2X includes vehicle-to-vehicle (V2V) communication, vehicle-to-pedestrian (V2P) communication, vehicle-to-infrastructure (V2I) communication, and vehicle-to-network (V2N) communication. As a cellular system evolves from long-term 4G evolution (LTE) to 5G, C-V2X evolves from LTE-V2X to NR-V2X (New Radio V2X, NR-V2X).

[147] V2X communication has great potential in reducing vehicle collision accidents and therefore in the corresponding reduction in the number of victims. The advantages of V2X are not limited to improved safety. A vehicle that can perform V2X communication helps to better manage traffic, further promoting green traffic and reducing energy consumption. An intelligent transport system Petition 870250108117, dated 11 / 26 / 2025, page 44 / 130 38 / 102 (Intelligent Transportation System, ITS) is an application combined with V2X. Based on V2X technology, a vehicle user (Vehicle UE, V-UE for short) can send information about the vehicle user to a nearby V-UE, such as location, speed, and intention (turning, entering, or reversing), as well as information triggered by certain periodic and aperiodic events. The V-UE can also receive information from a user in near real-time. 5G NR V2X can support lower transmission latency, more reliable communication transmission, higher throughput, and a better user experience, thus meeting the requirements of more comprehensive application scenarios. Furthermore, a vehicle-to-vehicle communication technology supported by V2X can be further applied to device-to-device (D2D) communication in any system.

[148] The protocol defines two resource allocation modes for the PC5 interface: mode 1 and mode 2. In mode 1, a base station allocates a transmission resource for V2X via the Uu interface. Therefore, the UE in mode 1 needs to be within network coverage. In mode 2, the UE autonomously selects the allocation of a transmission resource for V2X and does not need to perform the allocation via a base station. An SL spectrum resource can be shared with an uplink communication resource. In SL communication, mode 1 and mode 2 can be allocated to different resource pools or can share a resource pool. Sharing the resource pool can improve resource utilization, but resource conflicts can occur between mode 1 and mode 2. Therefore, the UE in mode 1 notifies the UE in mode 2 about a resource allocated for future transmission. 2. Grouping of SL resources

[149] SL communication can be performed based on a resource pool. The pooling of Petition 870250108117, dated 11 / 26 / 2025, page 45 / 130 39 / 102 resources is a time and frequency resource dedicated to SL communication. Alternatively, resource grouping can be understood as a set of resources that can be used for SL communication, i.e., a set of time-domain resources and frequency-domain resources used for SL communication.

[150] A resource grouping used for SL communication can be briefly called a resource grouping or an SL resource grouping. To summarize, the following uses resource grouping for description. The resource grouping can also be called a channel, operating channel, nominal channel bandwidth, and bandwidth. In other words, the resource grouping, channel, and bandwidth represent a set of resources that can be used for SL communication. The name of the resource grouping is not limited.

[151] In network coverage, the terminal device can obtain resource pool configuration information and / or bandwidth part (BWP) configuration information by receiving a system information block (SIB) from the network device, cell-specific radio resource control (RRC) signaling, or UE-specific RRC signaling from the terminal device. Alternatively, the terminal device can use pre-configured resource pool configuration information or SL BWP configuration information, for example, when there is no network coverage. Resource pool configuration information includes resource pool information, and resource pool information indicates a resource pool. The resource pool is a Petition 870250108117, dated 11 / 26 / 2025, page 46 / 130 40 / 102 is a set of time and frequency resources used for side-link communication between terminal devices. The SL resource grouping may also include a code domain resource.

[152] A resource in the SL resource grouping includes a resource used by the terminal device to send and receive at least one of the following physical channels, for example, a physical sidelink control channel (PSCCH), where the PSCCH is used to carry SCI; a physical sidelink shared channel (PSSCH), where the PSSCH is used to carry at least one of the following: control information, data, sidelink CSI feedback information and the like; a physical sidelink discovery channel (PSDCH), where the PSDCH is used to carry a discovery message; and a physical sidelink feedback channel (PSFCH), where the PSFCH is used for sidelink feedback information.Sidelink feedback information can be used for data information confirmation feedback, for example, a hybrid automatic repeat request (HARQ), an acknowledgment (ACK), a negative acknowledge (NACK), or channel state information (CSI). Sidelink feedback information can also indicate at least one of the following: for example, power saving information, resource assistance information (including a recommended resource, a non-recommended resource, a resource collision, a resource reservation collision, a half-duplex collision that occurred in the past or is about to occur in the future), and a physical sidelink broadcast channel (PSBCH). Petition 870250108117, dated 11 / 26 / 2025, page 47 / 130 41 / 102 where PSBCH is used to carry information about side link synchronization.

[153] A type of service transmitted in PSSCH may include a unicast communication type, a multicast communication type and / or a broadcast communication type. In the time domain, the SL resource grouping includes one or more time units. The time unit may be one or more symbols, one or more slots, one or more mini-slots, one or more subframes, one or more frames or the like. One or more time units may be contiguous or discrete in time.

[154] It must be understood that the time domain units in an SL resource cluster are logically contiguous.

[155] It should also be understood that, in this application, for specific definitions of the symbol, mini-slot, slot, subframe and frame, please refer to the 3GPP standard. Details are not described again in this document.

[156] It should be noted that, in this application, unless a time unit meaning is specifically specified, an interval is used for description, but the time unit is not limited to the slot only; and unless a time-frequency domain unit meaning is specifically specified, a subchannel is used for description, but the frequency domain unit is not limited to the subchannel only.

[157] In one example, as shown in FIG. 4, slots 1 through 8 are temporally contiguous slots, and these slots are called physical slots. Physical slots, i.e., slot 1, slot 3, slot 5, and slot 8, are configured as slots belonging to an SL resource grouping. Slots included in an SL resource grouping may be temporally non-contiguous. Therefore, from an SL resource grouping perspective, slots 1, 3, 5, and 8 in the physical slots correspond respectively to slot 1', slot 2', slot 3', and slot 4' in the resource grouping. Petition 870250108117, dated 11 / 26 / 2025, page 48 / 130 42 / 102 SL. In this case, the contiguous slots (i.e., slot 1', slot 2', slot 3', and slot 4') included in the SL resource grouping are logically contiguous slots in the SL resource grouping, and the slots that are logically contiguous but not necessarily contiguous in terms of time are called logical slots (logical slots).

[158] In the frequency domain, the SL resource grouping includes one or more frequency domain units. The frequency domain unit can be a resource element (RE), multiple REs, a resource block (RB), multiple RBs, a subchannel, or multiple subchannels. The size of a subchannel indicates the number of one or more contiguous or interlaced RBs included in the subchannel in the frequency domain, and the number can be an integer such as 10, 12, 15, 20, 25, or 50.

[159] SL resource grouping configuration information may also include PSCCH configuration information. PSCCH configuration information includes the number of symbols occupied by a PSCCH in a slot and the number of RBs occupied by a PSCCH in a subchannel. SL BWP configuration information may include SL resource grouping information intended for configuring the number of resource groupings included in a BWP. SL BWP configuration information may include SL bandwidth information indicating the size of a bandwidth for SL communication, for example, indicates that an SL bandwidth is 20 megahertz (MHz). SL BWP configuration information may also include SL symbol information indicating an initial location of the SL symbol in a slot and the number of contiguous SL symbols occupied.The SL BWP configuration information may also include information about a subcarrier spacing and a cyclic prefix that are specific to an SL, and the information indicates a... Petition 870250108117, dated 11 / 26 / 2025, page 49 / 130 43 / 102 subcarrier spacing and a cyclic prefix are used for SL communication. The cyclic prefix indicates either an extended cyclic prefix or a normal cyclic prefix. In one possible configuration, the SL BWP configuration information may also include the SL resource grouping configuration information.

[160] A time-frequency resource for SL communication is configured based on a grouping of SL communication resources. The grouping of SL communication resources can be considered as a set of time and frequency resources used for SL communication. For a time resource, a base station uses a bitmap and periodically repeats the bitmap to indicate a set of subframes that are in all subframes of a system and that are used for SL communication. FIG. 5 is a diagram of a bitmap indicating slots available for SL communication. The length of the bitmap is 8 bits. As shown in FIG. 5 and FIG. 6, a number of symbols occupied by SL transmission in each slot is fixed at M symbols, and M is defined as a transmission duration in the SL time domain or a transmission unit in the time domain.

[161] For frequency resources in an SL communication resource cluster, a base station divides a frequency band for SL communication into several subchannels, and each subchannel includes a specific number of resource blocks, for example, 10, 12, 15, 20, 25, 50, 75, or 100 physical resource blocks (PRBs). FIG. 6 is a diagram of a frequency resource in a communication resource cluster. A base station indicates a sequence number of the 1st resource block of a frequency resource used for SL communication, a total number N of subchannels included in the communication resource cluster, and a number nCH of resource blocks included in each subchannel. An SL transmission may occupy one or more subchannels. When a resource Petition 870250108117, dated 11 / 26 / 2025, pp. 50 / 130 44 / 102 SL communication is scaled, the scaling in the frequency domain is performed at a subchannel granularity.

[162] In this embodiment of this request, a subchannel may include one or more interleavings, and a subchannel including an interleaving may encompass an RB set or a plurality of RB sets. An RB set corresponds to a channel in which the listen-before-talk program is performed, i.e., a channel access program. FIG. 7 is a diagram of subchannels at different granularities. As shown in (a) in FIG. 7, an interleaving may encompass a plurality of RB sets or may be in only one RB set, and an RB set may correspond to a 20 MHz channel. Alternatively, as shown in (b) in FIG. 7, a subchannel may include a plurality of contiguous RB features.

[163] The SL resource grouping configuration information may also include PSCCH configuration information. If a PSFCH feedback resource is configured in the resource grouping, the PSFCH feedback resource will be configured once every N slots. In a V2X 2 transmission mode scenario, other than base station scheduling, a user needs to select a PSSCH send resource based on a user listen result. To simplify the PSFCH resource selection process, NR-V2X configures a PSFCH feedback resource for each PSSCH subchannel. A specific process for determining the PSFCH resource corresponding to each subchannel is as follows: (1) A bitmap (bitmap) of a PSFCH frequency domain resource is configured for the resource cluster, to indicate whether a specific PRB in a frequency domain resource in which the resource cluster is located can be used as a PSFCH resource. To be more specific, the length of the bit information included in the bitmap is equal to the number of PRBs in the resource cluster. A bit 1 in Petition 870250108117, dated 11 / 26 / 2025, page 51 / 130 A 45 / 102 bitmap indicates that a corresponding PRB can be used for PSFCH transmission, and a bit 0 indicates that a corresponding PRB resource cannot be used for PSFCH transmission. The leftmost bit of the bitmap is the lowest PRB index in the resource grouping. Specifically, the PSFCH resource can be used for HARQ-ACK transmission, and the resource is denoted as a slPSFCH-RB-Set bitmap. A bit value of 1 in the bitmap indicates that a corresponding PRB resource can be used for HARQ-ACK feedback. Additionally, the PSFCH resource can also be used for conflict indication in an inter-EU coordination (IUC) scheme. The resource is denoted as a bitmap corresponding to sl-RB-SetPSFCH, and a bit 1 in the bitmap indicates that a corresponding PRB resource can be used for Scheme 2 conflict indication. Note that a location where a bit value is 1 in sl-PSFCH-RB-Set does not overlap with a location where a bit value is 1 in sl-RB-SetPSFCH. FIG.X1 is a bitmap indicating a PSFCH resource according to one embodiment of this application. In a slot with a PSFCH transmission resource, it is assumed that a subchannel includes 10 PRBs and a resource grouping has three subchannels in total. In this case, a bitmap indicating a PSFCH frequency domain resource in the resource grouping includes 3*10=30 bits in total to indicate whether each PRB is available for PSFCH transmission. As shown in FIG. 8, the bitmap indicates that the first four PRBs of the first subchannel can be used for PSFCH feedback. The bitmap may indicate the HARQ-ACK resource or it may indicate the Scheme 2 conflict resource. (2) Because every N PSSCH slots correspond to one PSFCH feedback slot, for a grouping of resources including N subchannels, the number of RBs of a PSFCH feedback resource corresponding to each subchannel is M, slot = M PSFCH / í ΛΓ P PSFCHA ΡιΓιH Ο / W Τ' C* ΤΊ Τ' OQ Ο ΤΊ t A Ί1ΤΠΑ ('ύίιατίΊ-'! dp PRB, set / \NsubchNPSSCHJ,where™PRB, set represents a quantity of PRBs of a PSFCH frequency domain resource, that is, Petition 870250108117, dated 11 / 26 / 2025, p. 52 / 130 46 / 102 indicates a total number of bits whose value is 1 in a bitmap of the PSFCH frequency domain feature. (3) Considering a limitation of the decoding capacity of a receiving device, the receiving device cannot perform feedback immediately after receiving a PSSCH. Therefore, a time gap K for PSSCH feedback is defined in a standard. To be more specific, a PSSCH is transmitted to the PSSCH in a 1st available slot including a PSSCH resource. The slot and the slot in which the PSSCH is located are spaced by at least K slots, where a value of K is configured by a grouping of resources. FIG. 9 is a diagram in which a PSSCH corresponds to a time-domain PSSCH resource. When K=2, for PSSCHs ported in slots 0 and 1, feedback can be performed on a PSSCH resource in slot 3, and for PSSCHs ported in slots 2, 3, 4 and 5, feedback is performed on a PSSCH resource in slot 7.Furthermore, since feedback for slots 2, 3, 4, and 5 is performed on the PSFCH feature in one slot, slots 2, 3, 4, and 5 can be referred to as the PSSCH grouping window length. (4) The PSFCH resources available in a PSFCH feedback slot are allocated, first in the time domain and then in the frequency domain, to each subchannel in a feedback periodicity. FIG. 10 is a frequency domain PSFCH resource allocation diagram. When NPSSCH = 4, a PSFCH resource corresponding to each subchannel in four grouped PSSCH slots is a PSFCH feedback resource of a PRB allocated to each subchannel in each slot. In terms of formula representation, for an i-th slot in N grouped PSSCH slots, if a frequency domain subchannel number in a resource grouping is j, a corresponding PSFCH resource is Ff; IP mPSFCHA )I#PSFCH , P , P lyPSFCHA )I#PSFCH _ 1Q_1ΊT_ [ki +j NPSSCH)™subch, slot, ki+1 +j NPSSCH)™subch, slot 1J. If a user occupies two subchannels for transmission, for PSSCHs corresponding to 5 and 9 in the figure, the PSFCH resources Petition 870250108117, dated 11 / 26 / 2025, pp. 53 / 130 47 / 102 corresponding to PSSCHs are also 5 and 9, respectively, and are not contiguous in the frequency domain.

[164] For PSFCH feedback, a NACK and a NACK form a pair and are represented by different orthogonal sequences, i.e., a code domain. The valid logarithm can be set using a parameter, i.e., numMaxCSPair = {1,2,3, 4, 6} , and a maximum of {2, 4, 6, 8,12} pieces of information corresponding to the valid logarithm can be fed back.

[165] The SCI of an NR SL system is classified into 1st stage SCI and 2nd stage SCI. The PSCCH carries the 1st stage SCI. The 1st stage SCI is used to scale the 2nd stage SCI and PSSCH. Since the SL is a distributed system, all UEs need to correctly decode the 1st stage SCI before decoding the 2nd stage SCI and PSSCH. However, to reduce the complexity of blind decoding performed by the UE in the PSCCH, a PSCCH resource location is fixed, and the format information of the carried 1st stage SCI is also unique. In other words, the UE does not need to blindly detect a time-frequency resource location of the PSCCH, nor does it need to blindly detect SCI in different formats, and the UE only needs to detect, in a fixed time-frequency resource location of the PSCCH, whether the 1st stage SCI is present.A PSCCH can exist in each subchannel in each slot, that is, a starting time domain position of a PSCCH is the 2nd symbol for SL transmission in each slot, and a length of two or three symbols (determined based on the resource grouping configuration information); and a frequency domain position is a lower PRB index of each subchannel, and a length of at least 10 PRBs (determined based on the resource grouping configuration information), but does not exceed a subchannel size.

[166] A frequency resource assignment field and a time resource assignment field in the 1st stage SCI Petition 870250108117, dated 11 / 26 / 2025, page 54 / 130 48 / 102 respectively indicate a frequency domain resource and a time domain resource for PSSCH transmission. A Resource Reservation Period field indicates that a resource for PSSCH transmission is reserved periodically. A value for the Resource Reservation Period field is configured by the network device or pre-configured or predefined. For example, the value is indicated by the first RRC signal, and the first RRC signal can be determined by slResourceReservePeriod1. A 2nd stage SCI format is indicated by a 2nd stage SCI format field in the 1st stage SCI. An existing 2nd stage SCI format field is shown in Table 1. Table 1 Second-stage SCI format field (Value of second-stage SCI format field) 2nd-stage SCI format field (2nd-stage SCI format) 00 SCI 2-A format 01 SCI 2-B format 10 SCI 2-C ​​format 11 Reserved

[167] In the protocol, a transmit resource of the transmitting UE in a user-selected resource mode (mode 2) does not depend on a base station. The transmitting UE selects, in a resource selection window based on a detection result in a detection window of the transmitting UE, a transmit resource for communication.

[168] In one example, it is assumed that the transmitting UE activates resource selection in slot n. A specific resource selection procedure is as follows: Step 1: Determine a candidate feature Rx, and a feature selection window [n + T1, n + T2] in units of a slot and LsubCH contiguous subchannels, where 0 < T1 < TSroG / 1, Tproc,1 is determined in Table 1, μ is a configured subcarrier spacing, and T1 is selected based on the implementation. If T2min(configured) Petition 870250108117, dated 11 / 26 / 2025, page 55 / 130 49 / 102 by an upper layer) is less than the remaining PDB (data packet delay), T2min— T2— PDB (data packet delay) and T2 are selected based on the implementation. Otherwise, T2 is equal to the remaining PDB.

[169] Step 2: Determine a detection window [n — T0, n — Tproco), where T0 is configured using a top-layer parameter and TpLoc,0 is determined in Table 2. Table 2 ^SL 7pSrL0C,1 [Slot] 0 3 1 5 2 9 3 17

[170] Step 3: Determine a reference signal received power (RSRP) threshold Th(Pi>Pj), where the RSRP threshold and prioTX of data to be sent are related to a prioRX priority indicated by the received sidelink control information (SCI). Specifically, Th(Pi,Pj) is a (prioRX+(prioTX-1)*8)-th threshold in a set of RSRP thresholds configured for a resource grouping.

[171] Step 4: Initialize a set of available SA resources to include all time-frequency resources in the resource selection window.

[172] Step 5: Excluding the following SA time frequency resources: slots reserved for all periodic resources configured in a resource grouping corresponding to a slot (a slot for sending) that is not detected in the detection window.

[173] Step 5a: If the time-frequency resources excluded from SA are less than X% of the total resources in the resource selection window, perform the initialization in step 4 Petition 870250108117, dated 11 / 26 / 2025, page 56 / 130 50 / 102 again.

[174] Step 6: Continue to exclude the following time-frequency resources from SA: time-frequency resources that are reserved for successfully received and decoded 1st stage SCIs, whose RSRP measurement results on the demodulation reference signals (DMRSs) are greater than the RSRP threshold determined in step 3, that are in the resource selection window and that include a retransmission resource indicated by the 1st stage SCI and a periodically reserved resource.

[175] Step 7: If the amount of remaining resources in SA is less than X% of the total amount of resources in the resource selection window, where an X% value is set for resource grouping and is related to prioTX, increase the RSRP threshold determined in step 3 (increase by 3 each time), until the amount of remaining resources in Sa is no longer less than X% of the total amount of resources in the resource selection window and continue performing step 4.

[176] SA is reported to a higher layer (e.g., a MAC layer) and time-frequency resources (r0,r1,r2,...) are randomly selected from SA to send data. Before sending the data, a re-evaluation of the resources (r0,r1,r2,) is performed, and after the re-evaluation, preemption detection is performed on the selected resources (r0',r1',r2,...) from SA.

[177] A user performs resource revaluation and preemption detection in at least one m-T3 slot (T3=Tpr0C,i), and the UE may additionally enable resource revaluation and / or preemption detection before and after the m-T3 slot based on the implementation. One way to determine whether (r0,r1,r2,...) and (r0',r1',r2,...) need to be deleted is the same as in step 7, and one of the following conditions is met: (1) an sl-PreemptionEnable parameter is provided with a setting such as enabled, and prioTX>prioRX; or Petition 870250108117, dated 11 / 26 / 2025, p. 57 / 130 51 / 102 (2) the sl-PreemptionEnable parameter is provided without a setting as enabled, and prioRX<priopre e prioTX> priopre, where priopre is configured by a higher layer. If re / or r in (r0,r1,r2,...) and (r0',r1',r2,...) does not belong to SA (i.e., re η are excluded during re-evaluation and / or preemption detection, respectively), re / or r is reselected. A slot m is a next slot for sending, i.e., slot m belongs to (r0,r1,r2,...) and (r0,r1,r2,-). 3. Time resource indication value (TRIV) and frequency resource indication value (FRIV).

[178] In LTE-V2X, a PSSCH frequency resource is defined as a group of contiguous subchannels with a length of LsubCH. Therefore, a frequency domain position of a PSSCH is determined by an initial subchannel index nSu^cH and the length LSubCH of the group of contiguous subchannels in a side-link feature clustering, where 1 < LSubCH < NSubCH, 0 <nSulbCll < ^subCHLSubCH , e NSubCHé uma quantidade total de subcanais correspondentes ao agrupamento de recursos de enlace lateral.

[179] As shown in FIG. 11, it is assumed that NSUbCH= 8, and CubCH = 2, there are, in total, NSubCH - ^SubCH + 1 = 7 groups of contiguous subchannels whose lengths are 2, corresponding to a set 0 to a set 6 in the figure, and subchannel indices. The initial start values ​​^u / ch of contiguous subchannel groups are respectively 0 to 6, that is, when the length LSubCH is determined, there are NSubCH— LSubCH+ 1 corresponding start subchannel indices n^u / ch in the total corresponding to the length.

[180] In addition, in LTE-V2X, a piece of the SCI indicates a maximum of two PSSCH resources. The frequency locations of the two PSSCH resources are shown below: A subchannel index Petition 870250108117, dated 11 / 26 / 2025, page 58 / 130 The initial 52 / 102 of a PSSCH resource is determined by a subchannel index m of the current SCI, and the current SCI can be the sending UE SCI or the receiving UE SCI. An initial subchannel index nJufcCH of the other PSSCH resources and subchannel lengths LsubCH of the two PSSCH resources are indicated by a field. Location of the initial transmission and retransmission frequency resource in ICS. The frequency domain field has \loj(NsubCii(NsubCii + 1) / 2)1 bits in total and indicates Nsubcii(Nsubcii + 1) / 2 locations in total. When the lengths LsubCH are determined, NsubCH - LsubCH + 1 corresponding initial subchannel indices nsubCH in total correspond to the lengths. Therefore, a quantity NsubCH(NsubCH + 1) / 2 of locations indicated by the Location field of the initial transmission and retransmission frequency resource can be interpreted as 1 + 2 + - + NsubCH.

[181] Specifically, a field value is represented by a feature indication value (RIV) and a correspondence between the RIV and an initial subchannel index nfubcH and a length LsubCH of a frequency domain feature indicated by the field is as follows: If (LsubCH1)—[NsubCH / 2]then RIV = NsubCH * (LsubCH - 1) + n^H (1) Otherwise, RIV = NsubCH * (NsubCH - LsubCH + 1) + (NsubCH - 1 - nsubCH)(2)

[182] The following uses NsubCH= 10 as an example to specify an RIV encoding principle. As shown in Table 3, an upper triangular array can be obtained by substituting an initial subchannel index nfu[b!cHe a length LsubCH in the previous formula based on an RIV definition. When a value of L is from 1 to 6, a non-zero element in the array corresponds to the (LsubCH— 1) —\NsubCH / 2] part. When a value of L is from 7 to 10, a non-zero element corresponds to the (LsubCH— 1) >\NsubCH / 2] part. It should be noted that zero Petition 870250108117, dated 11 / 26 / 2025, pp. 59 / 130 53 / 102 in a lower triangular array here is not a value of RIV and is used only to highlight a structure of the upper triangular array. A row quantity index corresponding to each element in the upper triangular array indicates a length LsubcH, and a column quantity index indicates a starting subcH index ftJubcH. For example, 25 in the table corresponds to LsubCH3„startILsubCH = 5.

[183] ​​It can be discovered, by observing the table, that a lower half of the upper triangular matrix corresponds to missing values ​​in an upper half. For example, 19 in the table can be inverted and filled in the second row, 29 and 28 in the table can be inverted and filled in the third row in reverse order, 39, 38 and 37 in the table can be inverted and filled in the fourth row in reverse order, and so on, so that the upper triangular matrix can be transformed into a rectangle, and the length of each row is exactly NsUbCH·. When the lower half of the upper triangular matrix is ​​inverted and filled, a corresponding row quantity index NsUbCH— LsUbCH+ 2 can be considered as a mapping row quantity index corresponding to an original row quantity LsUbCH of the lower half of the upper triangular matrix.For example, the tenth line is mapped to the second line, the ninth line is mapped to the third line, and so on. Table 3 L=10 Resource Indication Value RIV 1 0 1 2 3 4 5 6 7 8 9 2 10 11 12 13 14 15 16 17 18 0 3 20 21 22 23 24 25 26 27 0 0 4 30 31 32 33 34 35 36 0 0 0 5 40 41 42 43 44 45 0 0 0 0 6 50 51 52 53 54 0 0 0 0 0 7 49 48 47 46 0 0 0 0 0 0 Petition 870250108117, dated 11 / 26 / 2025, pp. 60 / 130 54 / 102 L=10 Resource indication value RIV 8 39 38 37 0 0 0 0 0 0 0 9 29 28 0 0 0 0 0 0 0 0 10 19 0 0 0 0 0 0 0 0 0

[184] Furthermore, an initial RIV of each row is exactly the sum of all the elements in the rows preceding the row after the transformation into the rectangle. For example, the initial RIV of the third row is 20, which is exactly the sum of the elements in the first two rows after the transformation into the rectangle. Additionally, a red RIV of each row after the transformation is exactly the sum of an initial RIV and an initial subchannel index nJufcCH of the row. For example, 35 in the table is a sum of The initial RIV is 30 on the fourth line, and the initial subchannel index is nsiit>CH = 5. A black RIV of each line after the transformation is exactly the sum of an initial line RIV and an initial mapping subchannel index. The initial mapping subchannel index in this document is the difference between a length NsubCH of the line after the transformation minus 1 and an initial subchannel index nfuarCH of the RIV. One is subtracted from the length NsubCH of each line because the RIV starts at 0.

[185] For example, 38 in the table corresponds to LsubCH= 8,^^^ = 1, 38 is filled in the penultimate row in reverse order, and 38 is a sum of the initial RIV 30 in the fourth row and NsubCH - 1nsUibiCH = 8. Since an initial RIV of a subsequent row is equal to the sum of an initial RIV of a current row and the length of the current row, the black RIV of each row after the transformation can also be understood as a difference between an initial RIV of a subsequent row after the transformation minus 1 and an initial subchannel index of the RIV. For example, 38 in the table is a difference between an initial RIV 40 in the fifth row minus 1, i.e., 39, sstart_ηnsubCH1.

[186] The previous rule can also be obtained by directly analyzing the definition of the RIV. When GsubCH - 1) — \.NsubCH / 2J ,o Petition 870250108117, dated 11 / 26 / 2025, page 61 / 130 55 / 102 RIV can be divided into two parts: NsubCH(LsubCH— 1) and nsubch. If the length of each line is exactly NsubCH, NsubCH(LsubCH— 1) corresponds to the sum of all elements preceding the line after transformation into a rectangle, and nsubCH corresponds to an initial subchannel index. When (LsubCH — 1) >[NsubCH / 2],NsubCH > 1.NsubCH— LsubCH+ 1) corresponds to the sum of all elements preceding the line after transformation into a rectangle, (NsubCH — LsubCH + 1) indicates that LsubCH corresponds to a line preceding a mapping line quantity index, and NsubCH— —nsubch corresponds to a mapping start subchannel index.

[187] It can be seen from the previous table that there are 55 index values ​​in total, and only 6 bits are needed for indication. If a starting position and a length are indicated separately, 4(24>10)+4(24>10)=8 bits are needed for the indication, so 2 bits can be reduced using a TRIV.

[188] In NR-V2X, an SCI chunk needs to indicate at most two or three PSSCH features. When an upper-layer parameter NMAX=2, an SCI chunk needs to indicate at most two PSSCH features, and the indication method is the same as in LTEV2X. When an upper-layer parameter NMAX=3, an SCI chunk needs to indicate a maximum of three PSSCH features, and the subchannel lengths LsubCH of the three PSSCH features in the frequency domain are the same. An initial subchannel index of a PSSCH feature is determined by a subchannel index m of the current SCI ο Uo Q11U CSSP 3 1 C ΉSt@rt 1 sStG-Tt2 JJ current and initial subchannel indices '^subCH and '^subCH of the two remaining PSSCH features and subchannel lengths LsubCH need to be indicated by a Frequency Feature Assignment field in the SCI. This field has \l0g2 (NsubCH^ubCH + 1)(2 NsubCH + 1) / 6 bits and indicates NsubCH(NsubCH + 1)(2NsubCH + 1) / 6 possibilities in total. Petition 870250108117, dated 11 / 26 / 2025, pp. 62 / 130 56 / 102

[189] Specifically, an FRIV needs to indicate initial subchannel indices nstart 1 enstart 2 and initial 'LsubCHe'^subCHe subchannel lengths LsubCHde two PSSCH resources. For a specific LsubCH, s,star11rísubCH Each LsubCH has NsubCH - LsubCH + 1 possible locations in total, that is, there are (NsubCH - LsubCH + 1)² possible location combinations in total. When LsubCH = 1, (NsubCH - LsubCH + 1)² = (NsubCH)², when LsubCH = 2, (NsubCH - LsubCH + 1)² = (NsubCH - 1)², and so on. A FRIV needs to indicate 1 + 2 + - + (NsubCH)² = NsubCH(NsubCH + 1)(2²NsubCH + 1) / 6 possible location combinations in total. Therefore, Ilog 2(NsubCH(NsubCH + 1)(2NsubCH + 1) / 6 bits are needed in total.

[190] Furthermore, the positions of the three PSSCH resources in the time domain are indicated by a Time Resource Assignment field in the SCI. The field has 9 bits in total and can indicate three cases respectively: only one PSSCH resource is indicated in the SCI (one possibility), two PSSCH resources are indicated in the SCI ((W - 1) possibilities), and three PSSCH resources are indicated in the SCI ((W — 1) * (W - 2) / 2 possibilities). W = 32 is a maximum length of a resource window of at most three PSSCH resources in the time domain, i.e., the maximum of three PSSCH resources can be located only in a time domain window with a length of 32 slots.

[191] Specifically, in the NR-V2X, one way to indicate TRIV and FRIV is as follows: For TRIV, if sl-MaxNumPerReserve is set to 2, a quantity N of reservations can be set correspondingly to 1 or 2. If slMaxNumPerReserve is set to 3, a quantity N of reservations can be set correspondingly to 1, 2, or 3. A specific way of indicating TRIV is shown in FIG. 12: If N = 1 TRIV = 0 Petition 870250108117, dated 11 / 26 / 2025, pp. 63 / 130 57 / 102 Otherwise, if N = 2 TRIV = 0 Otherwise if If t2 - t1 - 1 < 15 TRIV = 30(t2 - t1 - 1) + t1 + 31 Otherwise, TRIV = 30(31 - t2 + t1) + 62 - t1.

[192] For TRIV, if sl-MaxNumPerReserve is set to 2, TRIV = nScc„i + Σ·ί^“~1(Nsubc„ + 1 - í) ·

[193] If sl-MaxNumPerReserve is set to 3, e-dít / _ γ,ααατΐ . ..startv(j _i_ i _ V^sufcCH-1f NI -i_ 1 _ rRIVnsu&CH,1+ nsubCH,2 ~(^subCH+ 1 í)+Σί=1(^subCH+ 1 í)· 3. Listen Before Talk (LBT) Mechanism

[194] In the process of evolving a wireless communication system, research into an unlicensed frequency band begins gradually. For example, technologies such as LTEU, LAA, and MulteFire emerge. The 3GPP organization standardized LAA and enhanced licensed assisted access (eLAA) and further enhanced licensed assisted access (feLAA) technologies so that an LTE system can coexist with a Wi-Fi device based on an LBT mechanism and allow communication of the LTE Uu interface in an unlicensed frequency band. In a 5G NR system, NR protocol technologies in an unlicensed frequency band are collectively called NR-U. To improve the communication performance of the Uu interface corresponding to NR-U, the 3GPP organization discussed a method for integrating a frame structure of a Uu interface with the LBT mechanism.

[195] Similarly, enabling SL communication in an unlicensed frequency band in local space is also an important evolutionary direction, and protocol technologies Petition 870250108117, dated 11 / 26 / 2025, pp. 64 / 130 58 / 102 corresponding points can be collectively referred to as SL-U. Similar to the Uu interface, a terminal operating according to SL-U also needs to coexist with a nearby Wi-Fi device based on the LBT mechanism.

[196] The LBT mechanism is a random back-off based channel access rule. To be more specific, before accessing a channel and starting to send data, a terminal needs to detect if the channel is idle. If the terminal detects that the channel has been idle for a specific period of time, the terminal can occupy the channel. If the terminal detects that the channel is not idle, it needs to wait and can only occupy the channel after it is restored to idle again. The LBT mechanism is a mandatory feature for using an unlicensed frequency band because there are regulatory requirements in various regions of the world for using unlicensed frequency bands. Various forms of terminals operating according to different communication protocols can use unlicensed frequency bands only when the regulations are met, so that spectrum resources are used fairly and efficiently.According to national and regional regulatory requirements for the use of an unlicensed frequency band, in the example of a 5 GHz frequency band, to access a 20 MHz channel, a minimum occupied channel bandwidth (OCB) requirement must be met to access the channel. Typically, the minimum OCB is at least 80% of a normal bandwidth. In the example of 20 MHz, a bandwidth of at least 16 MHz needs to be occupied for preemption of the 20 MHz channel. A 3GPP NR-U system introduces a concept of interlaced resource block and defines the interlacing mE{0, 1, ..., M-1} as including {m, M+m, 2M+m, 3M+m, ...} RBs. When the subcarrier spacing is 15 kHz, M=10. When the spacing is... Petition 870250108117, dated 11 / 26 / 2025, pp. 65 / 130 59 / 102 subcarrier is 30 kHz, M=5. As shown in the following figure, for a 15 kHz SCS, there are 10 interleavings, and each interleaving uses one-tenth PRB.

[197] To comply with regulations, the 3GPP organization classifies LBT mechanisms in NR systems into the following four types: Category 1 LBT: After obtaining the channel occupancy time (COT), a communication device sends data immediately after a short switching gap from a receiving state. This is known as Category 1 LBT. COT refers to a period of time during which the communication device can occupy a channel after successfully accessing it, where the switching gap time cannot exceed 16 μ8.

[198] Category 2 LBT: LBT without random backoff is called LBT Cat 2. To be more specific, after detecting that a channel is in an idle state and for a fixed period of time, a communication device can send data without performing a random backoff.

[199] Category 3 LBT: A random backoff LBT with a fixed-size contention window is called a Category 3 LBT. More specifically, a communication device generates a random number N based on a fixed-size contention window and can send data after detecting that a channel is in an idle state, lasting for a period of time determined based on the random number N. The size of the contention window is related to a minimum and a maximum value of N.

[200] Category 4 LBT: A random backoff LBT with a variable-size containment window is called a Category 4 LBT. To be more specific, a communication device generates a random number N based on a variable-size containment window and can send data after Petition 870250108117, dated 11 / 26 / 2025, page 66 / 130 60 / 102 detects that a channel is in an idle state and lasts for a period of time determined based on the random number N. The size of the contention window is related to a minimum and a maximum value of N, and the communication device can change the size of the contention window.

[201] As described below, in the NR-U protocol, an NR-U device conforms to the 3GPP protocol and uses an LBT mechanism as a channel access method. The NR-U device can use the following types of LBT mechanisms: LBT Type 1: Cat 4 LBT. The NR-U device needs to perform a random pullback before accessing a channel and sending data.

[202] Specifically, after detecting that the channel is idle for a sensing slot duration of a defer sensing duration (denoted as T_d), and after a counter N in the following step 4 is zero, a network device or a terminal device can start transmitting information. Specifically, according to the following steps, the counter N is adjusted by sensing a channel to obtain an additional sensing slot duration. (1) Set N = Ninit, where Nini is a random number uniformly distributed between 0 and CWp, and perform step 4. (2) If N> 0, and the network device or terminal device selects a countdown timer, set N = N- 1. (3) Detect the channel at a time granularity of Tsi=9 μ8, and if the channel is idle at the detection time granularity, go to step 4; otherwise, go to step 5. (4) If N= 0, stop; otherwise, execute step 2. (5) Continue detecting the channel until it is detected, in one Tslem other Td, that the channel is busy or it is detected that the channel is idle in all Tslem other Td detection slots. (6) If the channel is detected as idle in all Tslem detection slots other than Td, execute step 4; otherwise, Petition 870250108117, dated 11 / 26 / 2025, p. 67 / 130 61 / 102 complete step 5.

[203] Td includes a duration Tf= 16 μs and, subsequently, contiguous detection slot durations (denoted as Tsl), and CWmin,p— CWp— CWmax,p a containment window.

[204] CWmin,pe and CWmax,p are selected before step 1 of the previous procedure. mp, CWmin,p, and CWmax,p are based on a channel access priority class p associated with the transmission of the network device or terminal device, as shown in Table 4: Table 4 Reference table of priority parameters Channel Access Priority Class (p) mp CWmin,p CWmax, p Tmcot,p CWp Allowed Size 1 1 3 7 2 ms {3, 7} 2 1 7 15 3 ms {7, 15} 3 3 15 63 8 or 10 ms {15, 31, 63} 4 7 15 1023 8 or 10 ms {15, 31, 63, 127, 255, 511, 1023}

[205] In unlicensed side link transmission, a channel access priority parameter table is different from the table above, as shown in Table 5. Table 5 Reference table of priority parameters in unlicensed side link transmission Petition 870250108117, dated 11 / 26 / 2025, pp. 68 / 130 62 / 102 Channel Access Priority Class (p) mp CWmin, p CWmax, p Tm cot, p CWp Allowed Size 1 2 3 7 2 ms {3, 7} 2 2 7 15 4 ms {7, 15} 3 3 15 1023 6 or 10 ms {15, 31, 63, 127, 255, 511, 1023} 4 7 15 1023 6 or 10 ms {15, 31, 63, 127, 255, 511, 1023}

[206] Like priority, a lower channel access priority class value indicates a higher corresponding channel access priority.

[207] The COT channel occupation time for transmission from the network device or terminal device on a channel does not exceed Tmcolp, and a channel access procedure is performed based on a channel access priority class p associated with the transmission from the network device or terminal device.

[208] The network device or terminal device maintains a CWp contention window value, and adjusts the CWp value according to the following steps before step 1 in the previous indentation.

[209] For each priority class p G {1,2,3,4}, define CWp =CWmin,p ·

[210] In a HARQ-ACK feedback value corresponding to the data sent by the network device or terminal device in a reference subframe k, if at least Z=80% is determined as a NACK, increase a CWp value corresponding to each channel access priority class p G {1,2,3,4} to the next highest allowed value and continue performing the ACK / NACK determination in step 2; otherwise, perform step 1 of the CWp configuration = CWmin,p. Reference subframe k is an initial subframe of the last transmission. Petition 870250108117, dated 11 / 26 / 2025, pp. 69 / 130 63 / 102 performed by the network device or by the terminal device on the channel.

[211] LBT Type 2A: Cat 2 LBT with a 25 ps gap. After detecting that a channel has been idle for 25 ps, the NR-U device can access the channel and send data.

[212] LBT Type 2B: Cat 2 LBT with a 16 ps gap. After detecting that a channel has been idle for 16 ps, the NR-U device can access the channel and send data.

[213] LBT Type 2C: Cat 1 LBT with a gap of up to 16 μ8. The NR-U device does not need to detect a channel and can access it directly and send data after a switching gap of up to 16 ps on the COT.

[214] When NR-U and Wi-Fi devices coexist, the types of devices that perform an LBT mechanism can be classified into load-based equipment (load-based equipment, LBE) and frame-based equipment (frame-based equipment, FBE).

[215] LBE can perform channel detection and containment access at any time, without regard to a frame limit.

[216] The FBE is permitted to obtain COT only by means of contention access to a channel on a synchronized frame boundary in a system. The frame in this document represents a fixed frame period (FFP). A specific period value is configured using RRC signaling. For example, the period value can be 1 ms, 2 ms, 2.5 ms, 4 ms, 5 ms, and 10 ms, and can evenly divide the duration (20 ms) of two radio frames.

[217] After a current terminal device completes the LBT, the continuous occupation time of the COT channel can be obtained. The channel occupation time is the total time for the eNB / gNB / UE and any eNB / gNB / UE occupying a shared channel to perform transmission on the channel after the eNB / gNB / UE performs a corresponding channel access procedure. In addition, the device Petition 870250108117, dated 11 / 26 / 2025, pp. 70 / 130 A 64 / 102 terminal can share a resource on the COT with another terminal device. Currently, the following two solutions are available for resource sharing: Method 1: Sharing COT based on reserved resources

[218] To be more specific, when sending data, a terminal device can reserve a resource to be used later based on the SCI. Then, a terminal device that anticipates the COT after the LBT is completed can determine, based on the received SCI to reserve a resource, whether another terminal device reserves a resource in the COT and share the resource in the COT with the terminal device that reserves the resource.

[219] As shown in FIG. 13, a UE 1 terminal device completes LBT in an n-1 slot and a slot preceding the n-1 slot, and obtains COT. Before obtaining COT, the UE 1 terminal device detects that UE 2 reserves resources in an n+2 slot, an n+3 slot, and an n+4 slot, and UE 3 reserves a resource in an n+4 slot. In this case, UE 1 can send COT sharing indication information to notify UE 2 and UE 3 that UE 2 and UE 3 can use the resources in their respective reserved locations. Method 2: Open COT Sharing

[220] Regardless of whether a resource is reserved, a terminal device can share a resource in the COT with another terminal device. However, in this case, it may be necessary to specify the location of a specific time frequency resource shared with a specific terminal, to avoid a transmission conflict caused by different terminals using the same shared resource.

[221] As shown in FIG. 14, after obtaining the COT, UE 1 can share a remaining resource with another UE after using a portion of the resources in the COT, i.e., UE 1 uses resources in slot n for slot n+3 and shares resources in slot n+4 and slot n+5 with UE 2 and UE 3. Petition 870250108117, dated 11 / 26 / 2025, pp. 71 / 130 65 / 102

[222] In any form of COT sharing, it is necessary to indicate to the specific UE that the UE can use the shared COT. Similarly, in reservation-based COT sharing, it may be necessary to indicate which UE can use a reserved resource and a specific time and frequency resource location. In an open sharing scenario, which UE needs to use which time-frequency resource needs to be specifically indicated.

[223] Specifically, notification information can be carried in COT sharing indication information, and indication information can be carried in a 1st stage SCI, a 2nd stage SCI, or a MAC CE (media access control element). A manner in which a 2nd stage SCI carries COT sharing indication information is analyzed below.

[224] An additional ID needs to be added to the COT sharing indication information to indicate which UE needs to use a shared resource. The UE with which the resource is shared can know, only when a specific indication is given, that the shared COT resource can be used.

[225] The 2nd stage SCI has 140 bits in total, and the bits that need to be used are shown in Table 6, and 41 bits in total are used. In addition, besides a 41-bit field shown in the table, a field that may need to be carried additionally includes a channel access priority class (CAPC) value and an RB set indication, each of which requires 2 bits. Therefore, a maximum of 95 bits remaining can be used to carry the COT share indication information. Table 6: Bits used in the 2nd stage SCI Field: Number of bits required. Process number: HARQ 4 Petition 870250108117, dated 11 / 26 / 2025, pp. 72 / 130 66 / 102 Field Number of bits required (HARQ process number) New data indicator 1 Redundancy version 2 Source ID 8 Destination ID 16 HARQ feedback enabled / disabled indicator 1 CSI request 1 COT duration 6 Channel Access Type 2 Total 45

[226] However, the previous method does not involve a COT sharing indication information project in SL-U. To be more specific, COT resource sharing cannot be implemented between UEs in SL communication by simply reusing the previous method without an additional project for COT sharing indication information. In view of this, the modalities of this application provide a side-link COT resource sharing method. 4. Priority of side link information

[227] It should be understood that, in an example where the side link information is side link data, the priority of the side link information may be a priority of a PSSCH to carry the side link information or it may be a service priority of the side link information.

[228] For example, a priority class of side link information might include 1, 2, 3, ... and 8. A class of Petition 870250108117, dated 11 / 26 / 2025, pp. 73 / 130 67 / 102 Lower priority of side link information indicates a higher priority of side link information. For example, a priority corresponding to priority class 1 of side link information is higher than a priority corresponding to priority class 2 of side link information, the priority corresponding to priority class 2 of side link information is higher than a priority corresponding to priority class 3 of side link information, and so on.

[229] FIG. 15 is a diagram of a 100-side link COT sharing method according to an embodiment of this application. The following are shown in the figure.

[230] S101: UE 1 (i.e., a first terminal device) anticipates COT #1. Specifically, UE 1 determines the COT #1 channel occupancy time (i.e., the first COT channel occupancy time) through a channel access procedure.

[231] The channel access procedure can be understood as a process in which UE 1 accesses an unlicensed spectrum channel based on an LBT mechanism and occupies the channel for a period of time based on a specific parameter. The COT can be understood as a time-frequency resource occupied by a terminal device using the LBT mechanism, a frequency domain resource corresponding to the COT is the unlicensed spectrum channel, and a time domain resource corresponding to the COT is the time during which the terminal device occupies the unlicensed spectrum channel using the LBT mechanism.

[232] It should be understood that a minimum granularity of LBT in a frequency domain is a channel, which corresponds to an RB set, and is a channel with a bandwidth of 20 MHz.

[233] It should be understood that the LBT used by the terminal device in the channel access procedure is not limited in this embodiment of this application. For example, the terminal device may access the channel via the Type 1 LBT or via the LBT Petition 870250108117, dated 11 / 26 / 2025, pp. 74 / 130 68 / 102 Type 2 (including 2A, 2B and 2C).

[234] It should be noted that, in this embodiment of this application, COT sharing means that UE 1 shares the COT with another UE, i.e., COT sharing is performed between two or more UEs. Furthermore, UE 1 performing COT sharing can be an SL communication sender, and the other user equipment is an SL communication receiver. Alternatively, UE 1 performing COT sharing can be an SL communication receiver, and the other user equipment is an SL communication sender. Generally, the user equipment that first sends data generates COT sharing indication information. In other words, UE 1 and the other UE have the same structure, but UE 1 is the side that first sends data and therefore can generate the COT sharing indication information.

[235] Furthermore, COT sharing can be understood as UE 1 indicating, based on the sharing indication information, that the other UE can use a resource in UE 1’s initial COT.

[236] Optionally, when using a resource in a shared COT, the UE with which the resource is shared sends data to at least the UE of the initial COT on the resource. For example, when UE 1 shares a resource in the COT with UE 2, UE 2 sends data to at least UE 1 on the resource.

[237] Optionally, the shared resource can be a PSSCH or a PSFCH.

[238] S102: UE 1 determines, based on a priority threshold, a shared resource (i.e., a first resource) in COT #1.

[239] It should be understood that the priority threshold may be determined by the initial COT UE 1. As an example and not as a limitation, the priority threshold may be a maximum priority of a plurality of TBs to be transmitted or a plurality Petition 870250108117, dated 11 / 26 / 2025, pp. 75 / 130 69 / 102 of data packets on COT #1.

[240] Optionally, the priority threshold may be a lower priority of a plurality of TBs to be transmitted or a plurality of data packets in COT #1.

[241] Optionally, the priority threshold can be a priority of data sent in a 1st slot in COT #1.

[242] Optionally, the priority threshold can be a configured or pre-configured priority threshold for UE 1, and the priority threshold can be a priority threshold configured in a resource grouping.

[243] Optionally, the priority threshold can be a lower priority of reserved resources in resources determined by UE 1 for sharing in COT #1. For example, the initial COT #1 of UE 1 includes four slots, a priority of data to be sent in slot #1 is 5, a priority of data to be sent in slot #2 is 1, a priority of data to be sent in slot #3 is 2, a priority of data to be sent in slot #4 is 5, and UE 1 detects that the priorities of resources reserved by other UEs in slots #2, #3 and #4 are respectively 2, 3 and 4. In a priority-for-priority comparison, UE 1 shares a resource in slot #4, and the resources in the other slots are not shared. In this case, it can be indicated that the priority threshold is 4, that is, it is determined that a shared resource that can be used corresponds to the lowest priority of the reserved resources.Correspondingly, in slot #3, UE 1 cannot reserve time for UE 2 to perform channel access, to ensure that other UEs cannot use a resource in slot #3 in the COT.

[244] It should be understood that a higher priority indicates a corresponding lower priority value. For example, a priority whose priority value is 1 is higher than a priority whose priority value is 2. Petition 870250108117, dated 11 / 26 / 2025, page 76 / 130 70 / 102

[245] Furthermore, UE 1 determines, based on the priority threshold, whether to share a resource in COT #1, or UE 1 determines, based on the priority threshold, whether to use a resource in COT #1. Specific descriptions are provided below for these two cases: Case 1: Sharing of COT based on resource allocation.

[246] It must be understood that, as SL-U provides support for UE to reserve a resource, and UE 1 of the initial COT can determine, upon detecting resource reservation information from another UE, whether there is a resource reserved by the other UE in COT #1 and a priority of data to be transmitted on the reserved resource, UE 1 can determine, based on the priority threshold, whether it should share the resource reserved by the other UE in COT #1.

[247] That EU 1 detects resource reservation information from the other EU may mean that EU 1 obtains, upon receiving SCI information sent by the other EU, a location of the resource reserved by the other EU and a priority corresponding to the reserved resource.

[248] In this case, before S101, the COT 100 sharing method also includes S103.

[249] S103: EU 2 reserves a second remedy.

[250] Optionally, the COT 100 sharing method also includes S104: UE 2 sends second indication information to UE 1.

[251] The second indication information indicates a position in the time domain of the second resource reserved by EU 2, or a position in the time domain and a position in the frequency domain of the second resource reserved by EU. This is not limited in this modality of this request.

[252] Correspondingly, EU 1 receives the second indication information and EU 1 determines, based on the second indication information, that the second resource reserved by EU 2 is in Petition 870250108117, dated 11 / 26 / 2025, page 77 / 130 71 / 102 COT #1 obtained by UE 1.

[253] Furthermore, UE 1 determines, based on the predefined priority threshold and a priority of the second resource (i.e., a priority of data to be sent on the second resource reserved by UE 2), whether it should share the second resource with the corresponding UE 2.

[254] Specifically, when performing resource selection, UE 1 does not select a resource whose priority is greater than or equal to the priority threshold.

[255] In one possible implementation, the physical layer reports the priority threshold to a Medium Access Control (MAC) layer, so that the MAC layer does not select a time-frequency resource whose priority is greater than the priority threshold when selecting a resource from a resource set SA (see the resource selection process, and the details are not described again in this document).

[256] In this way, the physical layer needs to report to the MAC layer resource reservation information from another UE that is also detected, or a set of resources reserved by the other UE, and the MAC layer determines the location of a potential shared resource.

[257] Optionally, the priority threshold is determined directly by the Medium Access Control (MAC) layer based on the data to be transmitted.

[258] In another possible implementation, when performing resource exclusion, UE 1 excludes reserved resources whose priorities are higher than the priority threshold and reports this resource set and the resource set SA to the MAC layer. Finally, the MAC layer selects resources together in the resource selection process and indicates to the physical layer to share the resources with other UEs.

[259] It must be understood that, in this way, the threshold of Petition 870250108117, dated 11 / 26 / 2025, pp. 78 / 130 72 / 102 priority can be indicated by the MAC layer to the physical layer. In other words, the priority threshold can be determined by the MAC layer, and the priority threshold is determined by the MAC layer based on the data to be transmitted.

[260] In another possible implementation, when determining at least one second resource reserved by UE 2, UE 1 can report at least one second resource to the MAC layer. The MAC determines, based on the priority threshold, whether to share the reserved resource and / or the MAC determines, based on the priority threshold and the resource reserved by UE 2, a location of a resource selected by UE 1. This step can be completed before obtaining the COT and during resource selection.

[261] It should be understood that, after determining whether the second resource should be shared with the corresponding UE 2, UE 1 generates a first indication information, to indicate that a resource in COT #1 is shared with UE 2.

[262] It must be understood that when UE 1 does not receive the booking information from UE 2, the first indication information must still include the priority threshold.

[263] S105: UE 1 sends the first indication information to UE 2, where the first indication information includes the priority threshold.

[264] Correspondingly, UE 2 receives the first indication information from UE 1.

[265] The first indication information may be sent in the 1st slot in COT #1 determined by UE 1, or it may be sent in each slot in COT #1. This is not limited in this modality of this request.

[266] Optionally, the first indication information sent in each slot may be different. For example, the first indication information may be updated dynamically with the sending times.

[267] In a possible implementation, the first information Petition 870250108117, dated 11 / 26 / 2025, pp. 79 / 130 73 / 102 indication may be further indicated. For example, the first indication information may be carried in a 1st stage SCI, the priority threshold may be carried in a 2nd stage SCI, or the priority threshold may be carried in a MAC CE. This is not limited to this modality of this application.

[268] In another possible implementation, UE 1 may reuse a priority in the current SCI as the priority threshold, to implicitly indicate a time-frequency resource location of a shared COT resource. Furthermore, it is considered that the priorities of the data to be sent by UE 1 from the initial COT in different slots in the COT may be different, and the reused SCI may be the SCI of data sent by UE 1 in the 1st slot in COT #1, or the SCI may be the SCI of a slot in which the first indication information successfully decoded by UE 2 is located. This is not limited in this embodiment of this application.

[269] In addition, the first indication information also includes COT #1 resource information (i.e., resource information of the first COT), so that the EU receiving the first indication information can determine the resource information of COT #1. Resource information includes information on all or part of the resources in COT #1. This is not limited in this modality of this request.

[270] Optionally, COT resource information includes, but is not limited to, one or more of the following: a CACP channel access priority, a COT time domain start position, a COT duration, and a position of an RB set included in the COT in the frequency domain.

[271] For example, if COT #1 includes an n slot, an n+1 slot and an n+2 slot, the resource information may include a resource in the n slot, a resource in the n+1 slot and a resource in the n+2 slot, or the resource may include one or two of the resources in the n slot, the resource in the n+1 slot and the resource in the n+2 slot. Petition 870250108117, dated 11 / 26 / 2025, pages 80 / 130 74 / 102

[272] Optionally, the first indication information also includes an additional ID (i.e., a first identifier) ​​to indicate the UE that can use the shared COT. Specifically, UE 1 determines, based on the priority threshold, which UE can use the shared COT in S102, to determine, based on the priority threshold, a number of UEs with which the COT can be shared, i.e., a number of additional IDs and specific additional IDs.

[273] Optionally, the first indication information may be a first pair of identifiers, and UE 1 may further indicate, based on an additional ID pair, the UE that may use the shared COT. Each additional ID pair includes a service ID of UE 1 and an ID of the UE with which the COT is shared or a service ID. The service ID of UE 1 is used by the UE with which the COT is shared to determine the use of a shared resource for sending the initial COT to the UE.

[274] As an example and not a limitation, as shown in FIG. 16, UE 1 initializes the COT in slot n, i.e., obtains the COT by performing Type 1 channel access, and detects that in slots m_a_m+3, UE 2 and UE 3 reserve resources in slots n+3 to n+6 in UE 1's COT, and their priorities are 1, 2, and 3, respectively. However, UE 1 obtains that the priorities of the data that UE 1 needs to send in the COT are 2 and 3. In this case, UE 1 performs the priority comparison and determines that only slots whose priorities are greater than or equal to 2 are shared, i.e., slot n+1 and slot n+2. In this case, when the COT sharing indication information (i.e., the first indication information) is sent in slot n, a priority threshold (PriorityThreshold=2) can be indicated, and the shared COT can only be used by reservations whose priorities are greater than or equal to 2. Therefore, the number of UEs with which the COT can be shared and Petition 870250108117, dated 11 / 26 / 2025, page 81 / 130 75 / 102 that are determined by UE 1 is 2, respectively UE 2 and UE 3, and UE 1 generates two additional IDs, and the values ​​of the two additional IDs are respectively UE2 and UE3, or UE 1 generates two pairs of additional IDs, whose values ​​are respectively<UE1, UE2> and<UE2, UE3> .

[275] S106: UE 2 determines, based on the first indication information, whether the second resource can be used.

[276] Specifically, after obtaining, through analysis, the priority threshold contained in the nomination information, the UE 2 that receives the first nomination information needs to compare the reservation priority with the priority threshold, to determine if the second reserved resource can be used.

[277] It must be understood that before determining, based on the priority threshold, whether the shared time-frequency resource can be used, UE 2 further determines, based on the COT #1 resource information included in the first indication information, that the time domain position of the second reserved resource is in COT #1. Furthermore, UE 2 determines, based on the priority threshold included in the first indication information and the priority of the data to be sent on the second resource, whether the second resource can be used, i.e., when the priority of the data to be sent on the second resource is greater than or equal to the priority threshold, UE 2 determines that the second resource can be used.

[278] It must be understood that the resources that can be used and that are determined by UE 2 may be all or part of the resources shared by UE 1 in COT #1. In other words, UE 1 may correspondingly share, with one or more UEs that reserve resources in COT #1, resources whose priorities are greater than or equal to the priority threshold in COT #1 for use.

[279] Optionally, when the first indication information includes a CAPC, UE 2 can use the shared resource only when a priority access CAPC of Petition 870250108117, dated 11 / 26 / 2025, page 82 / 130 76 / 102 data channel to be transmitted from UE 2 is greater than the CAPC indicated in the first indication information.

[280] Optionally, when UE 2 sends the data on the shared time-frequency resource (i.e., a third resource), the destination UE that receives the data includes at least UE 1, i.e., UE 2 sends the data to at least UE 1 on the time-frequency resource.

[281] It must be understood that the shared time-frequency resource (i.e., the third resource) that can be used in COT #1 and that is determined by UE 2 may be all or part of the time-frequency resource reserved by UE 2 in COT #1. One reason is that the priorities of the data to be sent by UE 2 in different slots in COT #1 may be different, and UE 2 can only use a time-frequency resource whose priority is higher than the priority threshold in the reserved resource.

[282] Specifically, when the second resource reserved by UE 2 includes a plurality of slots for sending data of different priorities, UE 2 determines, based on the priority threshold included in the first indication information and the priorities of the data to be sent in the plurality of slots in the second resource, whether all or part of the second resource can be used.

[283] As an example, instead of a limitation, UE 1 obtains COT by performing channel access in slot n, and UE 2 reserves resources in slot n for slot n+2 in COT to send data #1, #2 and #3 respectively. The priorities of data #1, #2 and #3 are 3, 2 and 1 respectively. When the priority threshold included in the first indication information is 2, and COT can only be shared when a data priority is greater than or equal to the priority threshold, after receiving the first indication information, UE 2 can determine, based on the priority threshold, that data #2 and data #3 can be sent in slot n+1 and slot n+2. Petition 870250108117, dated 11 / 26 / 2025, page 83 / 130 77 / 102

[284] In one possible implementation, when the first referral information includes an Additional ID (i.e., a first identifier), UE 2 can further determine, by determining if there is an Additional ID referring to UE 2, whether UE 2 can use the second resource.

[285] It should be understood that the first nomination information may include a plurality of additional IDs or a plurality of additional ID pairs, which respectively indicate a plurality of UEs with which resources are shared. The UE receiving the first nomination information may determine, based solely on the additional IDs (or additional ID pairs), whether the UE may use a reserved resource, or the UE receiving the first nomination information may determine, based on whether an additional ID (or additional ID pair) of the UE is indicated and the priority threshold in the first nomination information, whether the UE may use a reserved resource. This is not limited in this modality of this request.

[286] As an example and not as a limitation, UE 2, UE 3, and UE 4 separately reserve a resource in COT #3 obtained by UE 1, and UE 1 generates, based on the priority threshold and the priorities of the data to be sent by UE 2, UE 3, and UE 4 in the reserved resources, two additional IDs whose values ​​are respectively UE3 and UE4. After receiving the first indication information, UE 3 and UE 4 determine that the resources reserved in COT #3 can be used. Correspondingly, after receiving the first indication information, UE 2 can determine, solely on the basis that the first indication information does not include the additional ID indicating UE 2, that the resource reserved in COT cannot be used. Alternatively, UE 2 can determine, based on the fact that the first indication information does not include the additional ID indicating UE 2 and that the priority of the data to be sent in the resource reserved by UE 2 in COT #3 is less than the threshold of Petition 870250108117, dated 11 / 26 / 2025, page 84 / 130 78 / 102 priority, which means the resource reserved in the COT cannot be used.

[287] It should be noted that when UE2 reserves a plurality of slots for sending data in the COT obtained by UE1, even if UE1 determines, based on the priority threshold, to share the resources in the plurality of slots with UE2, UE1 generates only one Additional ID whose value is UE2 or a pair of Additional IDs whose value is<UE1, UE2> .

[288] It must be understood that after UE 2 determines that the second reserved resource in COT #1 can be used, UE 2 can use the second resource according to its own implementation.

[289] Optionally, after the physical layer determines the shared time-frequency resource (i.e., the first resource) that can be used in COT #1, UE 2 can directly send the data packet on the time-frequency resource.

[290] Optionally, after the physical layer determines the shared time-frequency resource (i.e., the first resource) that can be used in COT #1, UE 2 can report the shared resource to the MAC layer, indicate that the resource is a shared resource, and instruct the MAC layer to perform resource selection.

[291] It should be understood that, after the time frequency resource that can be used is determined, UE 2 needs to perform Type 2 channel access before the shared resource, or needs to switch from Type 1 channel access to Type 2 channel access before the shared resource. Case 2: Open COT Sharing

[292] In this case, UE 2 does not reserve a resource in COT. After determining, in S102, the shared resource in COT #1, UE 1 generates the first indication information, where the first indication information includes the priority threshold. For a detailed process in which UE 1 determines shared resources in COT #1, see case 1. Details are not described again in this document. Petition 870250108117, dated 11 / 26 / 2025, page 85 / 130 79 / 102

[293] S105: UE 1 sends the first indication information to UE 3. Optionally, the first indication information includes the priority threshold.

[294] Correspondingly, UE 3 receives the first indication information from UE 1.

[295] The first indication information may additionally carry out the indication, or UE 1 may reuse a priority in the current SCI as the priority threshold. For a specific method, see case 1. Details are not described in this embodiment of this request.

[296] In addition, the first indication information also includes COT #1 resource information (i.e., resource information of the first COT), so that the EU receiving the first indication information can determine the resource information of COT #1. Resource information includes information on all or part of the resources in COT #1. This is not limited in this modality of this request.

[297] S107: UE 3 determines, based on the first indication information, whether a resource in COT #1 can be used.

[298] After obtaining, through analysis, the priority threshold carried in the indication information, UE 3 that receives the first indication information needs to compare a data priority (or data to be sent) that is expected to be sent on COT #1 with the priority threshold, to determine if a shared time-frequency resource on COT #1 can be used and further determine the shared time-frequency resource (i.e., a third resource) that can be used on COT #1.

[299] It must be understood that before determining, based on the priority threshold, whether the shared time-frequency resource can be used, UE 3 further determines, based on the COT #1 resource information included in the first indication information, the COT #1 resource information Petition 870250108117, dated 11 / 26 / 2025, page 86 / 130 80 / 102 shared by the EU 1.

[300] Furthermore, UE 3 determines, based on the priority threshold included in the first indication information and the priority of the data to be sent, whether the shared resource in COT #1 can be used, i.e., when the priority of the data to be sent is greater than or equal to the priority threshold, UE 3 determines that the shared resource in COT #1 can be used to send the data to be sent.

[301] As an example and not as a limitation, UE 1 shares COT #1 from slot n to slot n+3 with UE 3 based on the first indication information and indicates, based on the first indication information, that the priority threshold is 2. After receiving the first indication information, UE 3 determines, based on a priority equal to 1 of the data that UE 3 expects to send on COT #1, that UE 3 can send the data on COT #1 and selects all or part of the time frequency resources in slot n to slot n+3 to send the data.

[302] It must be understood that the resource (i.e., the third resource) that can be used and that is determined by UE 3 may be all or part of the resources shared by UE 1 in COT #1.

[303] Optionally, when UE 3 sends the data on the shared time-frequency resource, the destination UE that receives the data includes at least UE 1, i.e., UE 3 sends the data to at least UE 1 on the time-frequency resource.

[304] Optionally, when the first indication information includes a CAPC, UE 3 still needs to compare a CAPC corresponding to the data to be sent from UE 3 and the indicated CAPC. The shared resource can only be used when the CAPC corresponding to the data to be sent is greater than the indicated CAPC.

[305] Optionally, the first indication information includes indication information regarding the licensing of a resource. Petition 870250108117, dated 11 / 26 / 2025, p. 87 / 130 81 / 102 PSFCH (i.e., PSFCH resource sharing and licensing information) indicates that the PSFCH resource in COT #1 can be shared.

[306] Optionally, the PSFCH resource licensing indication information may be indicated using a single bit or a plurality of bits.

[307] In one possible implementation, the PSFCH resource licensing indication information may use 1 bit to indicate that any responding device (an example, a third-party terminal device) may use the shared PSFCH resource or indicate that the responding device may not use the shared resource. Correspondingly, the responding device that receives the PSFCH resource licensing indication information may send feedback information about the shared PSFCH resource on COT #1 or may not use the shared PSFCH resource.

[308] Optionally, the PSFCH resource licensing indication information can be replaced by PSFCH sharing indication information.

[309] Optionally, the PSFCH resource licensing indication information may alternatively indicate that any terminal device (another example of a third terminal device) may use the shared PSFCH resource. Compared with the limitation that only the responding device may use the shared PSFCH resource, resource utilization may be further enhanced.

[310] It should be understood that the shared PSFCH resource may be all or part of a PSFCH resource in the first COT.

[311] It should be understood that the responding device may determine and use, based on PSFCH licensing information and the PSFCH resource used by the responding device, the PSFCH resource licensed for use.

[312] The response device can be defined as a Petition 870250108117, dated 11 / 26 / 2025, pp. 88 / 130 82 / 102 end of the initial COT UE 1 data reception, or a terminal device indicated by UE 1 based on additional identification information (e.g., an Additional ID or a pair of Additional IDs) in the sharing indication information. Specifically, the 1-bit PSFCH licensing information can indicate true or false, or (0 / 1). For example, when the licensing information indicates true, this indicates that all responding devices that receive the indication information can use the shared PSFCH resource. In this way, the device with which the resource is shared uses the shared resource only after receiving the licensing information, thus fulfilling a regulatory requirement.

[313] In another possible implementation, the resource licensing indication information can indicate a plurality of states using a plurality of bits. For example, a state 1 can indicate that only one recipient of data sent by a COT initiator can use the shared resource. With reference to FIG. 17, the data receiving end can be defined as a receiving device (UE 5) of data sent by UE 2 on the initial COT of UE 2, or it can indicate a data receiving device (UE 4 and UE 5) of UE 2 in a current slot and the initial COT of UE 2, to ensure that the shared resource is used by the data receiving UE and ensure that the COT is not lost.

[314] For example, UE 2 indicates UE 3 based on an additional ID in the COT indication information. In this case, a state 2 can indicate a device whose indication information is additionally indicated, i.e., UE 3 can use the shared PSFCH resource.

[315] For example, a state 3 indicates that a receiving end of the UE with which the COT is shared can send feedback on the shared PSFCH (UE 6 and UE 2). Petition 870250108117, dated 11 / 26 / 2025, pp. 89 / 130 83 / 102

[316] For example, a state 4 indicates that no EU can use the shared PSFCH resource.

[317] Apparently, compared with state 1, state 2 and state 3 release a restriction on the use of the PSFCH resource, so that more terminal devices can perform feedback on different frequency domain resources of the same symbol, thus improving resource utilization.

[318] It should be understood that feedback information sent in the shared PSFCH resource can be ACK / NACK feedback or can be feedback only in NACK format. This is not limited to this type of request.

[319] It should be understood that, in another possible implementation, any plurality of states in the previous plurality of states can be combined to form a new state, and any combination of the plurality of states can be indicated by a plurality of bits. For example, devices included in state 1 and state 2 can be combined into a state 5. State 5 can indicate that UE 5 and UE 3 or UE 4, UE 5 and UE 3 can use the shared resource.

[320] It should be noted that the previous indication method is not limited to a unicast or multicast scenario.

[321] It must be understood that UE 2 expects to send a plurality of data chunks in COT #1, the priorities of the data sent in different slots are different, and UE 2 can only use a time-frequency resource whose priority is higher than the priority threshold in the reserved resource.

[322] As an example and not as a limitation, UE 1 shares COT #1 from slot n to slot n+3 with UE 3 based on the first indication information and indicates, based on the first indication information, that the priority threshold is 2. UE 3 expects to send data #4, data #5 and data #6 in COT #1, and their priorities are respectively 3, 2 and 1. After receiving the first indication information, UE 3 determines, based Petition 870250108117, dated 11 / 26 / 2025, pp. 90 / 130 84 / 102 in the priorities of the data that are expected to be sent, that data #5 and data #6 can be sent on COT #1 and selects all or part of the time-frequency resources in slot n for slot n+3 to send data #5 and data #6.

[323] It is easy to understand that when the UE performs COT sharing, if the UE does not indicate a location of a resource to be shared with a specific UE, a transmission conflict problem may occur where different UEs use the same resource to send at the same time.

[324] FIG. 18 is a diagram of another COT sharing scenario. As shown in FIG. 18, UE 1 initializes the COT and detects that UE 2 and UE 3 have reserved resources in UE 1's COT. Considering that UE 2's reservation priority is higher, UE 1 can share a resource in an n+2 slot with UE 2, but UE 3's reserved resource priority is lower, and UE 1 does not share a resource in an n+3 slot. However, without considering a reservation-based COT mechanism, UE 2 needs to know the shared resource. Otherwise, UE 2 does not know which shared resource should be used by UE 2. Therefore, the indication of the specific time-frequency resource needs to be specifically designed.

[325] For COT resource sharing on a side link, one embodiment of this application further provides a method for indicating a time-domain resource location, and the method can be used in conjunction with method 100, or used based on additional indication information. In this way, the overheads of COT indication information can be reduced while COT sharing of unlicensed spectrum resources is implemented in SL-U, so that when the same SCI carries user information, more UEs can be indicated to use the shared resource, thus improving resource utilization and improving the overall performance of the SL-U system.

[326] It should be understood that, in comparison with a displacement Petition 870250108117, dated 11 / 26 / 2025, pp. 91 / 130 85 / 102 to indicate separately an initial position and a length, because t1 <t2 existe entre t1 e t2 em um TRIV, ou seja, um valor de t2 é necessariamente maior que o de t1, as despesas gerais podem ser reduzidas de forma a indicar dois recursos com base no TRIV. Por exemplo, como mostrado na figura, se dois campos representam diretamente dois valores t, um total de 5*2=10 bits é necessário. No modo TRIV, como 1<t1<31, t1<t2<31 e há apenas 32*31 / 2=496 combinações no total, apenas 9 bits são necessários e a sobrecarga de 1 bit pode ser reduzida. É fácil entender que os overheads são reduzidos porque um valor de t2 é necessariamente maior que o de t1, ou seja, quando o valor de t1 é 10, o valor de t2 é necessariamente de 11 a 31, e há apenas 21 valores no total.

[327] To reduce the overall resource expenditure of COT sharing indication information, in this modality of this application, TRIV is introduced into COT sharing to indicate a time domain position shared with the EU.

[328] FIG. 19 is a diagram of a 200 side-link COT sharing method according to an embodiment of this application. The following are shown in the figure.

[329] S201: UE 1 (i.e., a first terminal device) anticipates COT #2. Specifically, UE 1 determines the COT #2 channel occupation time (i.e., the second COT channel occupation time) through a channel access procedure. For a process in which UE 1 performs channel access, see step S101. Details are not described again in this document.

[330] It should be understood that, in COT sharing, a maximum COT case is considered, i.e., COT=10 ms. In a 60 kHz subcarrier spacing, if the slot length is 0.25 ms, the maximum COT will be 40 slots. Furthermore, this solution is not limited to a case where the maximum COT is 10 ms. Petition 870250108117, dated 11 / 26 / 2025, pp. 92-130 86 / 102 The maximum COT can alternatively be another value. The following design idea can also be reused. For example, if COT=6 ms, the corresponding maximum COT is 24 slots.

[331] The following describes separately in detail that UE 1 shares a resource in COT #2 with a single UE and a plurality of UEs. Case 1

[332] S202: UE 1 sends a third indication to UE 2, where the third indication indicates that UE 1 should share a resource in COT #2 with UE 2.

[333] As shown in (a) in FIG. 20, UE 1 uses a TRIV in the third indication information to indicate a start position and an end position of a feature #A (an example of a fourth feature) that can be used by UE 2 (i.e., an example of a second terminal device) in the time domain. It should be understood that feature #A may include one or more slots in the time domain. This is not limited in this embodiment of this application.

[334] Way A: t1 indicates an initial time domain position of feature #A, and t2 indicates an final time domain position of feature #A.

[335] Specifically, the UE can use t1 and t2 to indicate a time-domain resource location of resource #A in shared COT #2, where 2 <t1^40 e tUt2<40. Porque o recurso compartilhado precisa começar em um 2° slot do COT no domínio de tempo, um valor mínimo de t1 é 2. Quando um valor de t1 é 2, um valor de t2 pode ser qualquer valor de 2 a 40, para representar uma combinação. Neste caso, todas as combinações podem ser percorridas e (39+38+...+2+1)=(1+39)*39 / 2=780 combinações podem ser obtidas. Portanto, são necessários 10 bits no total para indicação, porque 2Λ10=1024> 780.

[336] For example, according to the previous TRIV design mode, TRIV can be designed as follows: Petition 870250108117, dated 11 / 26 / 2025, pp. 93-130 87 / 102 If t2 - t1 < 19 TRIV = 39(t2 -t1) + t1 —1 Otherwise, TRIV = 39(39 - t2 + t1) + 41 - t1

[337] When t1=20 and T2=40, a calculated value is 820.

[338] A corresponding TRIV table is shown in Table 7. Table 7 TRIV T1 = 1 T1=2 T1=3 ... T1 = 38 T1 = 39 T1 = 40 T2 = 1 0 0 0 ... 0 0 0 T2 = 2 0 1 0 ... 0 0 0 T2 = 3 0 42 2 ... 0 0 0 ... ... ... ... ... ... ... ... T2 = 38 0 156 194 ... 37 0 0 T2 = 39 0 117 155... 76 38 0 T2 = 40 0 ​​78 116... 115 77 39

[339] Furthermore, the maximum value that can be represented by 10 bits is considered to be 1024, which is much larger than 820. Therefore, the previous method is not the only method and can be written as follows: If t2 - t1 < 19 TRIV = 39(t2 - t1) + N + t1 Otherwise, TRIV = 39(39 - t2 + t1) + 41 + N - t1

[340] A value of N is greater than or equal to 0 and less than 244.

[341] Method B: t1 indicates an initial time domain position of feature #A, and t2 indicates a duration of feature #A, i.e., TRIV can indicate a combination of t1 and L.

[342] In this implementation, 2 <t1^40 e 1<l<39. quando um valor de t1 é 10, máximo l que pode ser indicado 31, há 780 valores no total. uma maneira indicação correspondente a seguinte:If L < 19 TRIV = 39(L - 1) + t1 - 1 Petition 870250108117, dated 11 / 26 / 2025, pp. 94 / 130 88 / 102 Otherwise, TRIV = 39(40 -L) + t1

[343] In this case, a corresponding TRIV table is shown in Table 8. Table 8 TRIV T1 = 1 T1=2 T1 = 3 ... T1 = 38 T1 = 39 T1 = 40 L=1 0 1 2 ... 37 38 39 L=2 0 40 41 ... 76 77 0 L=3 0 118 119 ... 115 0 0 ... ... ... ... ... ... ... ... L=38 0 117 116 ... 0 0 0 L=39 0 78 0 ... 0 0 0

[344] S203: UE 2 uses, based on the third indication information, the resource shared by UE 1 in COT #2.

[345] It should be understood that UE 2 can use, according to an implementation of UE 2, the resource shared by UE 1 in COT #2.

[346] Optionally, after a physical layer determines the resource shared by UE1 in COT #2, UE2 can directly send a data packet on the resource.

[347] Optionally, after the physical layer determines the resource shared by UE1 in COT #2, UE2 can report the resource to a MAC layer, indicate that the resource is a shared resource, and instruct the MAC layer to perform resource selection.

[348] It should be understood that, after the time frequency resource that can be used is determined, UE 2 needs to perform Type 2 channel access before the shared resource, or needs to switch from Type 1 channel access to Type 2 channel access before the shared resource. Case 2

[349] In this case, UE 1 uses two groups of TRIVs in third indication information to indicate a position. Petition 870250108117, dated 11 / 26 / 2025, pp. 95 / 130 89 / 102 initial and final resource positions for a plurality of EUs with which the COT is shared. Specifically, one group of TRIVs indicates the initial time domain position of the shared resource plurality, and the other group of TRIVs indicates the final time domain position of the shared resource plurality.

[350] S202: UE 1 sends the third indication information to UE 2 and UE 3, where the third indication information indicates that UE 1 should share resources in COT #2 with UE 2 and UE 3.

[351] As shown in (b) in FIG. 20, UE 1 determines to share a resource #B and a resource #C (two examples of fourth resources) in COT #2 with UE 2 and UE 3, and needs to indicate the corresponding time domain resource locations. The time domain position of resource #B shared with UE 2 starts at a duration t1 relative to a COT start position and ends at a duration t3, the time domain position of resource #C shared with UE 3 starts at t2 and ends at t4 .

[352] Method C: One group of TRIVs indicates the initial time domain positions t1 and t2 of feature #B and feature #C, and the other group of TRIVs indicates the final time domain positions t3 and t4 of feature #B and feature #C.

[353] Since feature #B and feature #C have a sequence relationship in the time domain, t1^t2 is used as an example, that is, 2 <t1^40 e t1^t2^40. neste caso, um grupo de trivs pode ser usado para indicar as posições iniciais do recurso #b #c. para uma indicação coletiva, consulte a fórmula da maneira a. os detalhes não são descritos aqui novamente. da mesma forma, finais t3 t4 #c podem indicadas pelo outro trivs, onde 2<t3^40 t1<t4^40. uma é consistente com t1 t2.Petition 870250108117, dated 11 / 26 / 2025, pp. 96 / 130 90 / 102

[354] Less D: One group of TRIVs indicates an initial time domain position t1 of feature #B and a time length L1 from t1 to t3, and the other group of TRIVs indicates a final time domain position t2 and a time length L2 from t2 to t4.

[355] S203: UE 2 and UE 3 use, based on the third indication information, the resources shared by UE 1 in COT #2.

[356] It should be understood that UE 2 and UE 3 may use, according to their own implementations, the resources in COT #2 shared by UE 1. For a specific way, see case 1. Details are not described again in this document.

[357] It should be understood that, in case 2, UE 1 can still send the third indication information to more than two UEs to indicate shared resources in COT #2. As shown in FIG. 21, UE 1 determines to share a resource #B, a resource #C and a resource #D (three examples of fourth resources) in COT with UE 2, UE 3 and UE 4. t1, t2 and t5 in TRIV represent respectively the initial positions of the time domain of resource #B, resource #C and resource #D, 2 <t1d40, t1dt2<40, t2<t5<40, e há 10.660 valores válidos no total. como 2λ14="16.304," apenas 14 bits são necessários para indicação.

[358] It should be understood that a shared time domain position that is indicated for specific UE use can also be indicated using two independent fields, i.e., a start position and an end position are indicated, or a start position and a duration are indicated. As the maximum COT is 40 slots, a single position or length indication needs 6 bits, i.e., 12 bits are needed to indicate a position in the time domain of a resource that can be used by a UE.

[359] Therefore, compared with the separate indication of a time domain position of a resource shared by three UEs, one way to indicate a time domain position of Petition 870250108117, dated 11 / 26 / 2025, pp. 97 / 130 91 / 102 a shared resource based on a TRIV can reduce 3*1214=24 bits.

[360] If it is necessary to indicate a specific resource location in the time domain, a start point and an end point in the time domain of a single UE each need 6 bits for indication.

[361] In addition, a single UE needs to indicate an additional ID, and 8 bits are required. If an additional UE ID and a specific time-domain resource location that can be used need to be indicated separately, 12+8=20 bits will be required.

[362] In this case, 2nd stage SCI indicates a maximum of four UEs that can use shared resources, because (14045) / (12+8)=4.75, where 45 bits are used fixedly to indicate other information.

[363] However, if the TRIV indication method provided in this embodiment of this application is used, a single UE needs only 9 bits to indicate a start position and an end position. In this case, the 2nd stage SCI can indicate a maximum of five UEs to use shared resources, because (14045) / (10+8)=5.28.

[364] For COT resource sharing on a side link, an embodiment of this application further provides a method for indicating a frequency domain resource location, and the method can be used in conjunction with method 100 and method 200, or used independently based on additional indication information. In this way, the overheads of COT indication information can be reduced while COT sharing of unlicensed spectrum resources is implemented in the SL-U, so that when the same SCI carries user information, more UEs can be indicated to use the shared resource, thus improving resource utilization and improving the overall performance of the SL-U system. Petition 870250108117, dated 11 / 26 / 2025, pp. 98 / 130 92 / 102

[365] It should be understood that in SL-U there are a maximum of 27 subchannels. Therefore, 5 bits are needed to indicate the location of a single subchannel. However, considering that in an unlicensed frequency band, a bandwidth of 20 MHz is an RB set, a frequency domain resource location may need to be indicated by specifying a particular RB set and the corresponding number of subchannels in the RB set. If a single RB set has a maximum of 10 subchannels, 4 bits will be needed to indicate the location of a subchannel. This solution does not limit the two scenarios.

[366] As shown in FIG. 22, a single FRIV indicates a start and end frequency domain position of a frequency domain resource #E used by the UE with which the resource is shared.

[367] In one possible implementation, a FRIV uses t1 to indicate a starting frequency domain position of feature #E and t2 to indicate a final frequency domain position of feature #E. For a specific indication, see TRIV. Details are not described again in this document.

[368] In another possible implementation, an initial position and a frequency domain subchannel length LsubCH of a frequency domain resource used by the UE with which the resource is shared are indicated. For a specific indication, see TRIV. Details are not described again in this document.

[369] It should be noted that a position in the frequency domain indicated by an FRIV may be two locations in an RB set or may be two locations of absolute features in all RB sets.

[370] It should be understood that this modality provided in this application is still applicable to a scenario in which frequency domain positions of a plurality of shared resources are indicated for a plurality of EUs. Specifically, positions Petition 870250108117, dated 11 / 26 / 2025, pp. 99 / 130 Frequency domain 93 / 102 of a plurality of shared resources can be indicated using two groups of FRIVs. One group of FRIVs indicates initial positions in the frequency domain of the plurality of shared resources, and the other group of FRIVs indicates final positions in the frequency domain of the plurality of shared resources. For a specific indication, see TRIV. Details are not described again in this document.

[371] For continuous slot transmission on a side link, an embodiment of this application further provides a method 300 for indicating idle symbol filling, to improve resource utilization and avoid COT interruption. The indication information indicates that the idle symbol is filled with data, to indicate that a data receiving end is performing data matching and corresponding decoding in time for transmission in this slot, thus avoiding a problem where the receiving end fails to correctly decode a data packet. As shown in FIG. 23, method 300 includes the following steps.

[372] S301: A fifth terminal device anticipates COT #4. Specifically, the fifth terminal device determines the occupation time of channel #4 through a channel access procedure.

[373] S302: The fifth terminal unit sends the sixth indication information to a sixth terminal unit. Correspondingly, the sixth terminal unit receives the sixth indication information.

[374] The sixth indication information indicates that an idle symbol in a time unit in which the sixth indication information is located is filled with data information.

[375] S303: The sixth terminal device determines, based on the sixth indication information, whether an idle symbol is present in a time unit in which the fifth indication information is present. Petition 870250108117, dated 11 / 26 / 2025, pages 100 / 130 94 / 102 received is filled with data.

[376] Method 300 is described in more detail below with reference to FIG. 24.

[377] The fifth terminal device determines to send data in an n+1 slot and an n+2 slot. Based on an existing slot structure design, the fifth terminal device sends data only in the first 13 symbols and reserves an idle symbol GAP in the 14th symbol. However, in an unlicensed frequency band, when UE 5 uses all frequency domain resources in a single channel and still uses contiguous slots, an idle symbol is still reserved in this case, and another UE can execute a channel access procedure to obtain a channel, causing a transmission conflict or COT interruption of UE 5.

[378] One embodiment of this application provides a method. A fifth terminal device determines to send data in an m+1 slot and an m+2 slot, and in the m+1 slot, the fifth terminal device fills an idle symbol with a PSSCH, to ensure COT continuity. Furthermore, when all symbols in a full slot are used to send data, a receiving end is notified by sending indication information (i.e., sixth indication information), so that the receiving end knows that the data sent in the slot occupies all symbols and performs the decoding. Therefore, a field needs to be added to the SCI to indicate that a GAP symbol in a slot corresponding to a GAP is filled with PSSCH data.

[379] Optionally, the sixth indication information may be carried in a 1st stage SCI or a 2nd stage SCI.

[380] It should be understood that the previous modalities can be used independently or can be used in combination. This is not limited in this solution.

[381] FIG. 25 is a block diagram of a wireless communication device according to an embodiment of this application. As shown in FIG. 25, the device 400 may include a unit Petition 870250108117, dated 11 / 26 / 2025, pp. 101 / 130 95 / 102 transceiver 410 and a processing unit 420. Optionally, the device may also include a storage unit 430, where the storage unit 430 is configured to store instructions.

[382] In one possible implementation, device 400 could be a first terminal device, or it could be a chip or a circuit, for example, a chip or a circuit that could be placed in the first terminal device.

[383] Processing unit 420 is configured to determine COT channel occupancy time.

[384] Processing unit 420 is further configured to determine, based on a predefined priority threshold, a shared resource in the COT.

[385] Transceiver unit 410 is configured to send indication information, where indication information includes one or more of the following: priority threshold, COT resource information, and licensing information for a PSFCH in the COT.

[386] In one possible implementation, device 400 could be a second terminal device, or it could be a chip or a circuit, for example, a chip or a circuit that could be placed in the second terminal device.

[387] Transceiver unit 410 is configured to receive indication information, where indication information includes one or more of the following: priority threshold, COT resource information and licensing information from a PSFCH in the COT.

[388] Processing unit 420 is configured to determine a resource that can be used in COT.

[389] It should be understood that the units in device 400 are configured respectively to perform actions or processing performed by the first terminal device or the second terminal device in the previous methods. Here, for Petition 870250108117, dated 11 / 26 / 2025, pp. 102 / 130 96 / 102 avoid repetitions, detailed descriptions are omitted.

[390] FIG. 26 is a block diagram of a terminal device according to an embodiment of this application; As shown in FIG. 26, the terminal device 500 includes a transceiver 510, a processor 520 and a memory 530. The transceiver 510, the processor 520 and the memory 530 communicate with each other and transfer a control signal and / or data using an internal connection path.

[391] In a possible implementation: The 520 processor is configured to determine the COT channel occupation time.

[392] Processor 520 is further configured to determine, based on a predefined priority threshold, a shared resource in the COT.

[393] Transceiver 510 is configured to send indication information, where indication information includes one or more of the following: priority threshold, COT resource information, and licensing information for a PSFCH in the COT.

[394] In another possible implementation: The 510 transceiver is configured to receive indication information, where indication information includes one or more of the following: priority threshold, COT resource information, and licensing information for a PSFCH in the COT.

[395] Processor 520 is configured to determine a feature that can be used in COT.

[396] It should be understood that when the 520 processor invokes a computer program from memory and runs the computer program, the 520 processor can be configured to perform the previous methods and implement a function of an entity executing the methods, for example, a first terminal device or a second terminal device.

[397] It must be understood that the previous modalities may Petition 870250108117, dated 11 / 26 / 2025, pp. 103 / 130 97 / 102 can be used independently or in combination. This is not a limitation in this solution.

[398] A person of ordinary skill in the art may be aware that, in combination with illustrative logical blocks and steps described in embodiments disclosed in this specification, functions may be implemented by electronic hardware or a combination of computer software and electronic hardware. Whether the functions are performed by hardware or software depends on particular applications and design constraints of the technical solutions. A person skilled in the art may use different methods to implement the described functions for each specific application, but it should not be considered that the implementation goes beyond the scope of this application.

[399] It may be clearly understood by a person skilled in the art that, for the sake of convenient and brief description, for a detailed working process of the preceding system, apparatus and unit, refer to a corresponding process in the preceding method embodiments. Details are not described again in this document.

[400] In the various embodiments provided in this application, it should be understood that the disclosed system, apparatus, and method may be implemented in other ways. For example, the apparatus embodiments described are merely examples. For example, division into units is merely a logical function division. There may be another way of division during actual implementation. For example, a plurality of units or components may be combined or integrated into another system, or some features may be ignored or not realized. Furthermore, the mutual couplings or direct couplings or communication connections shown or discussed may be implemented using some interfaces. Indirect couplings or communication connections between the apparatuses or Petition 870250108117, dated 11 / 26 / 2025, pp. 104 / 130 98 / 102 units can be implemented in electronic, mechanical, or other forms.

[401] The units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one position, or may be distributed across a plurality of network units. Some or all of the units may be selected based on the actual requirement to achieve the objectives of the modality solutions.

[402] Furthermore, functional units in embodiments of this application may be integrated into a processing unit, or each of the units may physically exist alone, or two or more units may be integrated into a unit.

[403] In the preceding embodiments, all or part of the functions of the functional units may be implemented using software, hardware, firmware, or any combination thereof. When software is used to implement the embodiments, all or part of the embodiments may be implemented in the form of a computer program product. The computer program product includes one or more computer instructions (programs). When the computer program instructions (programs) are loaded and executed on the computer, the procedure or functions according to the embodiments of this application are generated wholly or partially. The computer may be a general-purpose computer, a dedicated computer, a computer network, or other programmable devices.Computer instructions can be stored on a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, computer instructions can be transmitted from one site, computer, server, or data center to another site, computer, server, or data center via wire (e.g., a coaxial cable, an optical fiber). Petition 870250108117, dated 11 / 26 / 2025, pp. 105 / 130 99 / 102 or a digital subscriber line (DSL) or wireless (e.g., infrared, radio, or microwave). The computer-readable storage medium may be any usable medium accessible by the computer, or a data storage device, for example, a server or a data center, integrating one or more usable media. The usable medium may be a magnetic medium (e.g., a floppy disk, a hard disk, or magnetic tape), an optical medium (e.g., a digital video disc (DVD)), a semiconductor medium (e.g., a solid-state disk (SSD)), or similar.

[404] When functions are implemented in the form of a functional software unit and sold or used as a standalone product, the functions may be stored on a computer-readable storage medium. Based on this understanding, the technical solutions of this application essentially, or the part that contributes to conventional technology, or some of the technical solutions, may be implemented in the form of a software product. The computer software product is stored on a storage medium and includes various instructions to instruct a computer device (which may be a personal computer, a server, a network device, or similar) to perform all or part of the steps of the methods described in the embodiments of this application.Storage media includes any medium that can store program code, for example, a USB flash drive, a removable hard disk drive, a ROM, random access memory (RAM), a magnetic disk, or a compact disc.

[405] It should be noted that, in forms of this application, indicating may include indicating directly and indicating indirectly, or may include indicating explicitly and indicating implicitly. Information indicated by information is called information to be indicated. In a process of Petition 870250108117, dated 11 / 26 / 2025, pp. 106 / 130 100 / 102 specific implementation, the information to be indicated can be indicated in various ways. By way of example, but not limitation, the information to be indicated can be indicated directly, for example, using the information to be indicated or an index of the information to be indicated. Alternatively, the information to be indicated can be indicated indirectly by indicating other information, and there is an associative relationship between the other information and the information to be indicated. Alternatively, only part of the information to be indicated can be indicated, and the other part of the information to be indicated is known or pre-agreed.

[406] Various numbers, such as first and second, in forms of this application are used only to facilitate distinction and are not used to limit the scope of forms of this application. For example, the various numbers are used to distinguish between different indication information or different time gaps.

[407] In embodiments of this application, predefined or preconfigured may be implemented in a manner of pre-storing corresponding code, a table, or other related indication information in a device (for example, including a terminal device and a network device). A specific implementation thereof is not limited in this application. Herein, storage may mean storing in one or more memories. One or more memories may be arranged separately or may be integrated into an encoder or decoder, a processor, or a communication apparatus. Alternatively, some of the one or more memories may be arranged separately, and some of the one or more memories may be integrated into a decoder, a processor, or a communication apparatus. A memory type may be a storage medium in any format. This is not limited in this application. Petition 870250108117, dated 11 / 26 / 2025, pp. 107 / 130 101 / 102

[408] The protocol in the modalities of this application may be a standard protocol in the field of communication and may include, for example, an LTE protocol, an NR protocol, and a related protocol applied to a future communication system. This is not limited to the application.

[409] In some embodiments of this application, at least one means one or more, and a plurality of means two or more. And / Or describes an association relationship between associated objects and represents that there can be three relationships. For example, A and / or B can represent the following cases: Only A exists, A and B exist, and only B exists, where A and B can be singular or plural. The character / usually indicates an OR relationship between the associated objects. At least one of the following items (chunks) or a similar expression indicates any combination of these items, including a single item (chunk) or any combination of a plurality of items (chunks). For example, at least one of a, bec can indicate a, b, c, aeb, aec, bec, or a, be c. Each of a, bec can be in a singular form or a plural form.

[410] In embodiments of this application, the descriptions when..., in a case where..., if and the like mean that a device (e.g., a terminal device or a network device) performs the corresponding processing in a given objective case, and are not intended to limit time. The descriptions do not necessarily mean that the device (e.g., the terminal device or the network device) performs a determining action during deployment and do not imply any other limitation.

[411] This application describes a plurality of embodiments in detail with reference to a plurality of flowcharts. However, it should be understood that the flowcharts and related descriptions of their corresponding embodiments are merely examples to facilitate understanding and will not constitute Petition 870250108117, dated 11 / 26 / 2025, pp. 108 / 130 102 / 102 any limitations to this request. Each step in each flowchart does not necessarily need to be performed. For example, some steps can be skipped. Furthermore, the sequence of execution of each step is not fixed and is not limited to that shown in the figure. The sequence of execution of each step is determined based on a function and the internal logic of the step.

[412] The foregoing descriptions are only specific implementations of this application, but are not intended to limit the scope of protection of this application. Any variation or substitution readily discoverable by a person skilled in the art within the technical scope disclosed in this application will be within the scope of protection of this application. Therefore, the scope of protection of this application will be subject to the scope of protection of the claims. Petition 870250108117, dated 11 / 26 / 2025, pp. 109 / 130

Claims

1 / 2 CLAIMS 1. A communication method, CHARACTERIZED by comprising: determining a channel occupation time (COT) through a channel access procedure; sending a third indication information to a second user equipment (UE), wherein the third indication information indicates that a resource is being shared on the COT.

2. Method, according to claim 1, CHARACTERIZED in that: the third indication information further indicates an initial position and a frequency domain subchannel length LsubCH of a frequency domain feature of the feature in the COT.

3. Method, according to claim 1, CHARACTERIZED in that: the third indication information further indicates one or more channel access priority (CAPC), an initial time domain position of COT, a COT duration and a position of a set of RB included in the COT in the frequency domain.

4. Communication method, CHARACTERIZED by comprising: receiving a third indication piece of information from a first user device (UE), wherein the third indication piece of information indicates that a resource is being shared in a channel occupation time (COT); determining the resource in the COT based on the third indication piece of information.

5. Method, according to claim 4, CHARACTERIZED in that: the third indication information further indicates an initial position and a frequency domain subchannel length LsubCH of a frequency domain feature of the feature in the COT.

6. Method, according to claim 4, CHARACTERIZED in that: the third indication information further indicates one or more Channel Access Priority Codes (CAPC), an initial COT time domain position, a COT duration and a position of a set of RBs included in the COT in the frequency domain.

7. Communication apparatus, CHARACTERIZED in that the apparatus comprises a unit configured to perform each step of the method as defined in any one of claims 1 to 3.

8. Communication apparatus, CHARACTERIZED in that the apparatus comprises a unit configured to perform each step of the method as defined in any one of claims 4 to 6.

9. Computer program product, CHARACTERIZED by comprising instructions, wherein, when the instructions are run on a computer: the method, as defined in any one of claims 1 to 3, is performed; or the method, as defined in any one of claims 4 to 6, is performed.

10. Computer-readable storage medium, CHARACTERIZED in that the computer-readable storage medium stores a computer program and, when the computer program is run: an apparatus is enabled to perform the method as defined in any one of claims 1 to 3, or an apparatus is enabled to perform the method as defined in any one of claims 4 to 6. Petition 870250090873, dated 06 / 10 / 2025, p. 27 / 37

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