Method, device and user equipment for selecting resources for sidelink

Abstract

The present disclosure provides a resource selection method, an apparatus, and a user equipment for a sidelink, relating to the field of communications technology, the resource selection method for a sidelink comprising: selecting resources in a resource pool supporting hybrid automatic repeat request (HARQ) feedback, the selected resources being used for a PSCCH transmission and a PSSCH transmission, a correspondence relationship between the PSSCH transmission and the PSFCH transmission including at least one of: one PSSCH transmission corresponds to M1 PSFCH transmissions located in different time units; and one PSSCH transmission corresponds to up to M2 PSFCH transmissions located in different time units, where M1 and M2 are configured or pre-configured positive integers, and the PSFCH is used to carry HARQ feedback information.

Description

[Technical Field]

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS This disclosure claims priority to Chinese Patent Publication No. 202211214457.3, filed in China on September 30, 2022, the entire contents of which are incorporated herein by reference.

[0002] The present disclosure relates to the field of communications technology, and more particularly to a resource selection method, device, and user equipment for sidelink. [Background technology]

[0003] Conventionally, there is always a one-to-one correspondence between the Physical Sidelink Shared Channel (PSSCH) and the Physical Sidelink Feedback Channel (PSFCH), i.e., one PSSCH transmission corresponds to only one PSFCH feedback. In the design of unlicensed spectrum sidelink (SL-U) sidelink, to mitigate the problem of PSFCH transmission failure due to channel access failure, one PSSCH transmission can correspond to PSFCH transmissions in multiple different slots, i.e., there is a one-to-many relationship between PSSCH and PSFCH. However, there is no PSSCH resource selection mechanism when the PSSCH and PSFCH have a one-to-many relationship. If the time interval between two consecutive PSSCH transmissions is still set according to the related art, there is only one PSFCH feedback opportunity between two PSSCH transmissions. This may result in excessive retransmissions, which waste resources, or the transmitting end may cancel subsequent retransmissions if the receiving end fails to receive the data packet successfully, which defeats the original purpose of designing multiple PSFCH feedback opportunities. Summary of the Invention [Problem to be solved by the invention]

[0004] An object of the present disclosure is to provide a resource selection method, apparatus, and user equipment for sidelink, to solve the problem of lack of a PSSCH resource selection mechanism when PSSCH and PSFCH have a one-to-many relationship. [Means for solving the problem]

[0005] According to a first aspect, in order to achieve the above object, an embodiment of the present disclosure provides a resource selection method applied to a first user equipment, the resource selection method comprising: performing resource selection in a resource pool supporting Hybrid Automatic Repeat reQuest (HARQ) feedback, the selected resources being used for Physical Sidelink Control Channel (PSCCH) transmission and Physical Sidelink Shared Channel (PSSCH) transmission; The correspondence relationship between the PSSCH transmission and the physical sidelink feedback channel (PSFCH) transmission is: one PSSCH transmission corresponds to M1 PSFCH transmissions located in different time units; and one PSSCH transmission corresponds to at most M2 PSFCH transmissions located in different time units; M1 and M2 are set or preset positive integers, and the PSFCH is used to carry HARQ feedback information.

[0006] Optionally, the resources selected for the PSSCH transmission are: The time interval between any two resources used for the PSSCH transmission is equal to or greater than the HARQ feedback time; and a Sidelink Control Information (SCI) indication restriction for restricting the range of time units in which the PSSCH transmission resource indicated by the SCI is located.

[0007] Optionally, the HARQ feedback time is a sum of a first duration and a second duration; the first time length is a time for receiving and processing a PSFCH and a time for preparing a retransmission, The second length of time is: a time interval between the last symbol of a first resource of the two arbitrary resources used for the PSSCH transmission and the start symbol of a resource used for the last PSFCH transmission of the M1 PSFCH transmissions corresponding to the PSSCH transmission; and the time interval between the last symbol of the first of the two resources used for the PSSCH transmission and the start symbol of the resource used for the Nth (N is a positive integer equal to or less than M) PSFCH transmission corresponding to the PSSCH transmission.

[0008] Optionally, N is set, pre-set, or determined based on at least one of the maximum number of resources indicated by the SCI, the number of resources indicated by the SCI, the maximum spacing between resources indicated by the SCI, the period during which the PSFCH is set, the minimum time spacing between the PSSCH and the corresponding PSFCH, the reception and processing time of the PSFCH, the retransmission preparation time, and the channel occupancy time (COT).

[0009] Optionally, the step of selecting resources in a resource pool supporting Hybrid Automatic Repeat Request (HARQ) feedback comprises: The method includes a step of selecting resources according to one of the principles of preferentially satisfying the HARQ feedback time and preferentially satisfying the SCI indication restriction when the HARQ feedback time and the SCI indication restriction cannot be satisfied simultaneously.

[0010] Optionally, performing resource selection according to a principle of preferentially satisfying the SCI instruction constraints includes: adjusting the number of PSFCH transmissions corresponding to the PSSCH transmissions, wherein the number of PSFCH transmissions corresponding to the PSSCH transmissions is set, pre-set, or determined based on at least one of the maximum number of resources indicated by SCI, the number of resources indicated by SCI, the maximum interval between resources indicated by SCI, the period during which PSFCH is set, the minimum time interval between PSSCH and the corresponding PSFCH, the reception and processing time of PSFCH, the retransmission preparation time, and COT; and performing resource selection in the resource pool based on the determined number of PSFCH transmissions corresponding to the PSSCH transmission.

[0011] Optionally, the resource selection method comprises: Further comprising the step of indicating related information of the PSFCH by an SCI; The related information is the number of PSFCHs corresponding to the PSSCHs, the time domain location of the PSFCH corresponding to the PSSCH, and and the time-frequency position of the PSFCH corresponding to the PSSCH.

[0012] Optionally, the resource selection method comprises: transmitting the PSCCH and PSSCH on resources selected for transmission of the PSCCH and PSSCH; The method further includes receiving a PSFCH corresponding to the PSSCH.

[0013] Optionally, the resource selection method comprises: If the HARQ feedback information carried by the PSFCH is successfully received, determining whether to perform a next PSSCH transmission based on the HARQ feedback information; and if the HARQ feedback information is not successfully received, continuing to receive HARQ feedback information at a transmission time of a subsequent PSFCH corresponding to the PSSCH.

[0014] Optionally, the resource selection method comprises: If the HARQ feedback information is not successfully received and at least one PSFCH corresponding to the PSSCH is located after the next adjacent PSSCH transmission, not performing the next adjacent PSSCH transmission; or If the HARQ feedback information is not successfully received, performing the next adjacent PSSCH transmission.

[0015] According to a second aspect, in order to achieve the above object, an embodiment of the present disclosure provides a sidelink resource selection method, applied to a second user equipment, comprising: receiving a PSCCH and a PSSCH; providing HARQ feedback via a PSFCH transmission corresponding to the PSSCH transmission; The correspondence relationship between the PSSCH transmission and the PSFCH transmission is: One PSSCH transmission corresponds to M1 PSFCH transmissions located in different time units; and one PSSCH transmission corresponds to at most M2 PSFCH transmissions located in different time units; M1 and M2 are set or preset positive integers, and the PSFCH is used to carry HARQ feedback information.

[0016] Optionally, the method for selecting resources for sidelink comprises: If the correspondence relationship is that one PSSCH transmission corresponds to at most M2 PSFCH transmissions located in different time units, further comprising: obtaining, according to a received SCI, related information of a PSFCH that actually corresponds to the PSSCH transmission; The related information is the number of PSFCHs corresponding to the PSSCHs, the time domain location of the PSFCH corresponding to the PSSCH, and and the time-frequency position of the PSFCH corresponding to the PSSCH.

[0017] Optionally, the resource selection method comprises: determining a first resource to be used by a second PSFCH and HARQ feedback information to be carried by the second PSFCH when the first PSFCH fails to transmit HARQ feedback information successfully due to a channel access failure; transmitting the HARQ feedback information on the second PSFCH based on the first resource; The first PSFCH and the second PSFCH correspond to the same PSSCH, and the second PSFCH is located after the first PSFCH.

[0018] Optionally, determining a first resource used by a second PSFCH and HARQ feedback information carried by the second PSFCH comprises: If a first condition is satisfied, determining the first resource based on time-frequency location information of a second resource used for the PSFCH transmission, so that HARQ feedback information carried by the second PSFCH is the same as HARQ feedback information carried by the first PSFCH; The first condition is The next adjacent PSFCH transmission is located after the transmission time of the second PSFCH; and the adjacent next PSSCH transmission is located before the transmission time of the second PSFCH, and the HARQ restriction condition is not satisfied between the adjacent next PSSCH transmission and the transmission time of the second PSFCH.

[0019] Optionally, determining a first resource used by a second PSFCH and HARQ feedback information carried by the second PSFCH comprises: If the next adjacent PSSCH transmission is located before the transmission time of the second PSFCH and the interval between the next adjacent PSSCH transmission and the transmission time of the second PSFCH does not satisfy a HARQ restriction condition, determining the first resource based on time-frequency location information of a second resource used for the PSSCH transmission; and determining HARQ feedback information carried by the second PSFCH based on a decoding result for the PSSCH transmission; determining the first resource based on time-frequency location information of a third resource used by the adjacent next PSSCH transmission; and determining HARQ feedback information carried by the second PSFCH based on a decoding result of the adjacent next PSSCH transmission; determining the first resource based on time-frequency positions of resources of Y previous PSSCH transmissions of the second PSFCH (Y is a set or preset positive integer); and determining HARQ feedback information to be carried by the second PSFCH based on decoding results of the Y PSSCHs.

[0020] According to a third aspect, in order to achieve the above object, an embodiment of the present disclosure provides a resource selection device applied to a first user equipment, the resource selection device comprising: a selection module configured to perform resource selection in a resource pool supporting HARQ feedback, the selected resources being used for PSCCH transmission and PSSCH transmission; The correspondence relationship between the PSSCH transmission and the PSFCH transmission is: One PSSCH transmission corresponds to M1 PSFCH transmissions located in different time units; and one PSSCH transmission corresponds to at most M2 PSFCH transmissions located in different time units; M1 and M2 are set or preset positive integers, and the PSFCH is used to carry HARQ feedback information.

[0021] According to a fourth aspect, in order to achieve the above object, an embodiment of the present disclosure provides a sidelink resource selection device applied to a second user equipment, the sidelink resource selection device comprising: a receiving module configured to receive a PSCCH and a PSSCH; a first transmitting module configured to perform HARQ feedback on a PSFCH transmission corresponding to the PSSCH transmission; The correspondence relationship between the PSSCH transmission and the PSFCH transmission is: One PSSCH transmission corresponds to M1 PSFCH transmissions located in different time units; and one PSSCH transmission corresponds to at most M2 PSFCH transmissions located in different time units; M1 and M2 are set or preset positive integers, and the PSFCH is used to carry HARQ feedback information.

[0022] According to a fifth aspect, to achieve the above object, an embodiment of the present disclosure further provides a user equipment, the user equipment including a transceiver, a memory, a processor, and a computer program stored in the memory and executed by the processor, the processor, when executing the computer program, realizing the resource selection method for a sidelink according to the first aspect or the resource selection method for a sidelink according to the second aspect.

[0023] According to a sixth aspect, to achieve the above object, an embodiment of the present disclosure further provides a computer-readable storage medium having a computer program stored therein, which, when executed by a processor, realizes the resource selection method for a sidelink according to the first aspect or the resource selection method for a sidelink according to the second aspect. [Effects of the Invention]

[0024] The above technical solution proposed in the present disclosure has at least the following technical effects:

[0025] A resource selection method for a sidelink according to an embodiment of the present disclosure is applied to a first user equipment, the method comprising: selecting resources in a resource pool supporting HARQ feedback, the selected resources being used for PSCCH transmission and PSSCH transmission, wherein a correspondence relationship between the PSSCH transmission and the PSFCH transmission includes at least one of: one PSSCH transmission corresponds to M1 PSFCH transmissions located in different time units; and one PSSCH transmission corresponds to up to M2 PSFCH transmissions located in different time units, where M1 and M2 are configured or pre-configured positive integers, and the PSFCH is used to carry HARQ feedback information. Thus, when the PSSCH and the PSFCH have a one-to-many correspondence relationship, the resources selected for PSSCH transmission can have multiple PSFCH feedback opportunities between any two PSSCH transmissions, effectively avoiding a problem in which the PSFCH cannot be transmitted due to channel access failure. In addition, due to such a problem that the PSFCH cannot be transmitted, excessive retransmissions may be performed, resulting in a waste of resources, or if the receiving end is unable to receive the PSFCH, the transmitting end may cancel subsequent retransmissions, resulting in a failure to decode the data packet. [Brief explanation of the drawings]

[0026] [Figure 1]FIG. 1 is a schematic diagram showing a one-to-one correspondence between PSSCH and PSFCH. [Figure 2] 1 is a flowchart illustrating a method for selecting resources for a sidelink according to an embodiment of the present disclosure. [Figure 3] 10 is a second flowchart of a sidelink resource selection method according to an embodiment of the present disclosure. [Figure 4] FIG. 1 is a schematic diagram illustrating a one-to-two correspondence relationship between a PSSCH and a PSFCH according to an embodiment of the present disclosure. [Figure 5] FIG. 1 is a schematic diagram illustrating a one-to-maximum two-correspondence relationship between PSSCH and PSFCH according to an embodiment of the present disclosure. [Figure 6] 1 is a first schematic diagram of resource selection when the HARQ feedback time and SCI indication restrictions are not satisfied simultaneously according to an embodiment of the present disclosure; [Figure 7] 10 is a second schematic diagram of resource selection when the HARQ feedback time and SCI indication restrictions are not satisfied simultaneously according to an embodiment of the present disclosure; [Figure 8] 1 is a first schematic diagram of PSFCH feedback according to an embodiment of the present disclosure. [Figure 9] 10 is a second schematic diagram of PSFCH feedback according to an embodiment of the present disclosure. [Figure 10] 1 is a first structural schematic diagram of a sidelink resource selection device according to an embodiment of the present disclosure; FIG. [Figure 11] 2 is a second structural schematic diagram of a sidelink resource selection device according to an embodiment of the present disclosure; FIG. [Figure 12] FIG. 2 is a structural schematic diagram of a user equipment according to an embodiment of the present disclosure; DETAILED DESCRIPTION OF THE INVENTION

[0027] To clarify the technical problems, technical solutions, and advantages of the present disclosure, the present disclosure will be described in detail below with reference to the drawings and specific embodiments. In the following description, specific details such as specific configurations and assemblies are provided merely to enable a thorough understanding of the embodiments of the present disclosure. Therefore, those skilled in the art may make various changes and modifications to the embodiments described herein without departing from the scope and spirit of the present disclosure. Also, for the sake of clarity and conciseness, descriptions of well-known functions and configurations will be omitted.

[0028] It should be noted that the term "one embodiment" or "one embodiment" in the full specification means that a particular feature, structure, or characteristic associated with an embodiment is included in at least one embodiment of the present disclosure. Thus, the appearances of "in one embodiment" or "in one embodiment" throughout the full specification do not necessarily refer to the same embodiment. Furthermore, the particular feature, structure, or characteristic may be incorporated in any suitable manner in one or more embodiments.

[0029] In addition, in various embodiments of the present disclosure, the magnitude of the code of each of the following processes does not mean the order of execution, and the execution order of each process should be determined by its function and internal logic, and should not be limited in any way to the implementation process of the embodiments of the present disclosure.

[0030] In the embodiments of the present disclosure, "B corresponding to A" means that B and A are related to each other and B can be determined based on A. However, determining B based on A does not mean determining B based solely on A, but also means that B can be determined based on A and / or other information.

[0031] To explain the embodiments of the present disclosure, first, relevant technical points will be explained.

[0032] I. <Hybrid Automatic Repeat reQuest (HARQ) Feedback Mechanism> In the case of positive acknowledgement (ACK) / negative acknowledgement (NACK) feedback, after receiving a data packet, if the UE successfully decodes the data packet, it feeds back an ACK; if it fails to decode the data packet, it feeds back a NACK. Such a feedback method is applicable to unicast and multicast with connection. It has the advantage of being able to distinguish the discontinuous transmission (DTX) state. However, in the case of multicast, since each receiving UE has an independent Physical Shared Feedback Channel (PSFCH) resource, it is mainly applicable when there are few UEs in the group. When there are many UEs in the group, problems with PSFCH resource allocation occur.

[0033] The NACK-only feedback method can be applied to multicast without connection. All receiving UEs share the same PSFCH feedback resource. If any UE fails to correctly receive the Physical Sidelink Shared Channel (PSSCH), it transmits HARQ NACK information on the corresponding PSFCH resource. Such a method has the potential problem that it cannot distinguish the DTX and ACK states. Therefore, when a detection error occurs in the Physical Sidelink Control Channel (PSSCH), the transmitting (TX) UE cannot discover the PSSCH transmission error. II. <Corresponding Relationship between PSFCH and PSSCH> The current PSFCH resource is determined by an implicit mapping method, and there is a one-to-one mapping between PSFCH and PSSCH, that is, one PSSCH corresponds to only the PSFCH resource of one slot. The mapping method includes the following methods.

[0034] In method 1, map the PSFCH candidate resources based on the slot number of the related PSSCH and the number of the starting subchannel.

[0035] In method 2, map the PSFCH candidate resources based on the slot number of the related PSSCH and the number of the subchannels occupied by the PSSCH transmission.

[0036] III. <PSSCH Resource Selection in the Mechanism Supporting HARQ Feedback> When the UE performs resource selection, the time interval between any two resources should be at least the minimum time interval Z, and the minimum time interval includes two parts (Z = a + b). As shown in FIG. 1, a represents the time interval between the last symbol of the PSSCH transmission of the first resource (meaning the first of the above-mentioned any two resources) and the first start symbol of the corresponding PSFCH reception. This time interval is determined based on the upper layer parameter sl-MinTimeGapPSFCH-r16 (representing the minimum time difference between the PSSCH and the corresponding PSFCH, and the value may be {2, 3}, with the unit being slots) and the upper layer parameter sl-PSFCH-Period-r16 (representing the period of the PSFCH resource setting within the resource pool, and the value may be {0, 1, 2, 4}, with the unit being slots).

[0037] b represents the reception and processing time of the PSFCH and the retransmission preparation time (including physical channel multiplexing and TX - RX / RX - TX conversion time), and its value is determined by the UE implementation.

[0038] Hereinafter, a resource selection method, apparatus, and user equipment for sidelink according to an embodiment of the present disclosure will be described in detail with reference to the drawings.

[0039] As shown in FIG. 2, an embodiment of the present disclosure provides a resource selection method for sidelink applied to a first user equipment, and the method includes the following content. In step 201, resource selection is performed in a resource pool that supports HARQ feedback. Wherein, the selected resources are used for PSCCH transmission and PSSCH transmission, and the correspondence relationship between the PSSCH transmission and the PSFCH transmission includes at least one of: one PSSCH transmission corresponds to M1 PSFCH transmissions located in different time units, and one PSSCH transmission corresponds to up to M2 PSFCH transmissions located in different time units, where M1 and M2 are configured or pre-configured positive integers, and the PSFCH is used to carry HARQ feedback information.

[0040] It should be noted that: First, the PSCCH is used to transmit sidelink scheduling information, i.e., the PSCCH is used to transmit the scheduling information of the PSSCH. Second, in the embodiments of the present disclosure, the time unit may have a time granularity such as a subframe or a slot. Third, M1 and M2 may be the same or different.

[0041] In a sidelink resource selection method according to an embodiment of the present disclosure, a first user equipment selects resources to be used for PSCCH transmission and PSSCH transmission from a resource pool supporting HARQ feedback. The correspondence relationship between the PSSCH transmission and the PSFCH transmission corresponding to the PSSCH transmission includes at least one of a relationship in which one PSSCH transmission corresponds to M1 PSFCH transmissions located in different time units and a relationship in which one PSSCH transmission corresponds to at most M2 PSFCH transmissions located in different time units, where M1 and M2 are set or pre-set positive integers, and the PSFCH is used to carry HARQ feedback information. In this way, when the PSSCH and the PSFCH have a one-to-many correspondence relationship, the resources selected for the PSSCH transmission can provide multiple PSFCH feedback opportunities between two adjacent PSSCH transmissions, thereby effectively avoiding the problem of PSFCH transmission failure due to channel access failure. In addition, such a problem of being unable to transmit the PSFCH may lead to excessive retransmissions, resulting in a waste of resources, or the transmitting end may cancel subsequent retransmissions if the receiving end fails to receive the data packet, resulting in a failure to decode the data packet.

[0042] As an optional embodiment, in the embodiment of the present disclosure, the resources selected to be used for the PSSCH transmission satisfy at least one of the following requirements:

[0043] (1) The time interval between any two resources used for the PSSCH transmission is equal to or greater than the HARQ feedback time.

[0044] It should be noted that in this alternative embodiment, any two PSSCH transmissions belong to the same transport block (TB), that is, the time interval between any two PSSCH transmissions in the same TB should be equal to or greater than the HARQ feedback time.

[0045] (2) Sidelink Control Information (SCI) indication restriction, which is used to restrict the range of time units in which the PSSCH transmission resources indicated by the SCI are located, i.e., the resources indicated by the SCI indication restriction must be within 32 slots. Here, to further explain the indicated resources, the resources indicated by the SCI include the resources of the current transmission (the current transmission refers to the transmission corresponding to the SCI) and the resources of the subsequent transmissions indicated by the time resource indicator value (TRIV) / frequency resource indicator value (FRIV). For example, if the number of resources indicated by the SCI is 3, this means that the current transmission and the following two retransmissions must be located within 32 slots.

[0046] It should be noted that the resources used for PSSCH transmission are PSSCH transmission resources.

[0047] In one specific embodiment, the HARQ feedback time is the sum of the first duration and the second duration.

[0048] The first time length is a time for receiving and processing the PSFCH and a time for preparing a retransmission, i.e., the first time length includes a time for the first user equipment to receive and process the PSFCH and a time for preparing a PSSCH retransmission, i.e., the first time length is the sum of the time for receiving and processing the PSFCH and the time for preparing a PSSCH retransmission.

[0049] The second length of time is: a time interval between the last symbol of a first resource of the two arbitrary resources used for the PSSCH transmission and the start symbol of a resource used for the last PSFCH transmission of the M1 PSFCH transmissions corresponding to the PSSCH transmission; and the time interval between the last symbol of the first of the two resources used for the PSSCH transmission and the start symbol of the resource used for the Nth (N is a positive integer equal to or less than M) PSFCH transmission corresponding to the PSSCH transmission.

[0050] The HARQ feedback time in this specific embodiment will be described below with reference to a specific example.

[0051] In Example 1, one PSSCH transmission corresponds to M1 PSFCH transmissions located in different time units.

[0052] As shown in Figure 4, one PSSCH transmission corresponds to two PSFCH transmissions, and two PSFCH transmissions are two consecutive PSFCH transmissions. When determining the resource for the first PSFCH transmission, the first user equipment needs to consider the minimum time requirement between the PSSCH and the corresponding PSFCH. That is, the first PSFCH is the closest PSFCH that satisfies the minimum time requirement (e.g., the time interval indicated by "a" in Figure 4 is equal to or greater than the minimum time requirement). The time interval between a retransmission of the PSCCH / PSSCH and the second PSFCH corresponding to the initial transmission of the PSCCH / PSSCH (for example, the time interval indicated by "b" in Figure 4) must guarantee the PSFCH reception and processing time (the time to receive and process the PSSFCH) and the retransmission preparation time (the time to prepare for the PSCCH / PSSCH retransmission), i.e., the time interval between a retransmission of the PSCCH / PSSCH and the second PSFCH corresponding to the initial transmission of the PSCCH / PSSCH should be equal to or greater than the sum of the PSCCH reception and processing time and the retransmission preparation time.

[0053] In Example 2, one PSSCH transmission corresponds to at most M2 PSFCH transmissions located in different time units.

[0054] As shown in FIG. 5, one PSSCH transmission corresponds to at most two PSFCH transmissions, and the PSSCH for the initial transmission corresponds to two PSFCH transmissions (i.e., N is 2). Therefore, the first retransmission needs to be located after the second PSFCH corresponding to the initial transmission, the time interval between the second PSFCH corresponding to the initial transmission and the first retransmission PSSCH (the time interval indicated by "b" between the second PSFCH transmission corresponding to the initial transmission and the first retransmission in FIG. 5) needs to ensure the time for receiving and processing the PSFCH and the time for preparing for retransmission, and the time interval between the last symbol in the resource for the initial PSSCH transmission and the starting symbol in the resource for the second PSFCH transmission corresponding to the initial PSSCH transmission (for example, the time interval indicated by "a" between the initial transmission and the first PSFCH transmission in FIG. 5) should satisfy a minimum time interval requirement, which can be determined based on higher layer parameters.

[0055] Because the first PSSCH retransmission corresponds to one PSFCH transmission (i.e., N is 1), the interval between two retransmissions needs to guarantee the time requirement of the related art. Specifically, the time interval between the last symbol of the resource for the first PSSCH retransmission and the first symbol of the PSFCH transmission corresponding to the first PSSCH retransmission (the time interval indicated by "a" in FIG. 5) should satisfy the minimum time interval requirement, which may be determined based on higher layer parameters as described above. The time interval between the second PSSCH retransmission and the PSFCH corresponding to the first PSFCH retransmission (the time interval indicated by "b" in FIG. 5) needs to guarantee the time required for receiving and processing the PSFCH and the time required for preparing the retransmission.

[0056] The minimum value (first time length) of the time for receiving and processing the PSFCH and the time for preparing a PSSCH retransmission should be determined by the implementation of the terminal. Here, the time for receiving and processing the PSFCH and the time for preparing a PSSCH retransmission include physical channel multiplexing, and the time for conversion from transmission to reception (TX-RX) / reception to transmission (RX-TX), etc.

[0057] In an alternative embodiment, N is set or preset, or is determined based on at least one of the following: the maximum number of resources indicated by the SCI, the number of resources indicated by the SCI, the maximum interval between resources indicated by the SCI, the period in which the PSFCH is set, the minimum time interval between the PSFCH and the corresponding PSFCH (which may be the minimum time interval between the last symbol of a resource of a PSSCH transmission and the first symbol of a resource of the first PSFCH transmission corresponding to the PSSCH), the reception and processing time of the PSFCH (the time to receive and process the PSFCH), the retransmission preparation time (the time to prepare for retransmission), and the channel occupied time (COT).

[0058] The process of determining N will be explained below with reference to a specific example.

[0059] For example, if the determined maximum time length of the COT is 10 slots and the PSFCH configuration period is 4 slots, N is set to at most 2 to ensure that the PSFCH transmission and the PSSCH transmission are located within the same COT, i.e., one PSSCH transmission corresponds to at most two PSFCH transmissions.

[0060] Furthermore, for example, if the maximum number of resources indicated by the SCI is 3 and the number of resources actually indicated is also 3, then in order to ensure that the initial transmission and retransmission are located within 32 slots, assuming that the PSFCH period is 4 slots, each PSSCH corresponds to a maximum of three PSFCH transmissions.

[0061] In an alternative embodiment, step 201, i.e., performing resource selection in a resource pool supporting hybrid automatic repeat request (HARQ) feedback, comprises: If the HARQ feedback time and the SCI indication restriction cannot be satisfied simultaneously, resource selection is performed according to one of the principles of preferentially satisfying the HARQ feedback time and preferentially satisfying the SCI indication restriction.

[0062] That is, when selecting resources for PSCCH / PSSCH transmission in a resource pool that supports HARQ feedback, the time interval between resources for PSSCH transmission corresponding to one TB needs to consider both the HARQ feedback time and the SCI indication limit at the same time. However, if the HARQ feedback time and the SCI indication limit cannot be met simultaneously, the resource selection may prioritize the HARQ feedback time, i.e., the time interval between any two PSSCH transmissions may either satisfy the configured, pre-configured, or pre-defined HARQ feedback time, or prioritize the limit indicated by the SCI, i.e., ensure that the resource indicated by the SCI is located within a configured, pre-configured, or pre-defined time unit range (e.g., 32 slots).

[0063] In one specific embodiment, the step of selecting resources according to the principle of preferentially satisfying the SCI instruction constraints includes: adjusting the number of PSFCH transmissions corresponding to the PSSCH transmissions, where the number of PSFCH transmissions corresponding to the PSSCH transmissions is set, pre-set, or determined based on at least one of the maximum number of resources indicated by SCI, the number of resources indicated by SCI, the maximum interval between resources indicated by SCI, a period in which a PSFCH is set, a minimum time interval between a PSSCH and a corresponding PSFCH, a PSFCH reception and processing time, a retransmission preparation time, and a COT; and performing resource selection in the resource pool based on the determined number of PSFCH transmissions corresponding to the PSSCH transmission.

[0064] For example, one PSSCH transmission corresponds to K PSFCH transmissions, where the set or preset K is a positive integer less than or equal to M. Here, K may be determined based on at least one factor described above, and as one particular example, K may be set or preset to only 1.

[0065] Hereinafter, taking into account HARQ feedback and SCI indication restrictions to perform resource selection will be described with reference to a specific example.

[0066] The maximum number of reserved resources indicated by the SCI configured in the resource pool is three. As shown in Figure 6, when the PSFCH configuration period is four, one PSSCH corresponds to three adjacent PSFCHs located in different slots. Therefore, when resource selection is performed according to the one-to-three relationship between PSSCH and PSFCH, the time interval between the initial transmission and retransmission is greater than the maximum SCI indication interval (32 slots). Therefore, in this case, to satisfy the SCI indication restriction, the initial transmission may only indicate the first retransmission, and the first retransmission only indicates the second retransmission. Furthermore, in a case where the HARQ feedback time and the SCI indication restriction cannot be satisfied simultaneously, the interval between some PSSCH transmission resources in the resources indicated by the SCI may satisfy the HARQ feedback time restriction, and the resources indicated by the SCI may satisfy the restriction indicated by the SCI. For example, the maximum number of reserved resources indicated by the SCI configured in the resource pool is three. To ensure that the SCI indicates as many reserved resources as possible, as described above, if a retransmission is located after all PSFCHs corresponding to the previous transmission, it cannot be guaranteed that the initial transmission can indicate three resources. In this case, as shown in FIG. 7, the initial transmission PSSCH can correspond to three PSFCHs, and the first PSSCH retransmission can correspond to two PSFCHs to reduce the interval between transmissions, thereby ensuring that the initial transmission and retransmission are located within the time unit range (e.g., 32 slots) of the SCI indication restriction.

[0067] Furthermore, in one preferred embodiment, the method further comprises: The method further includes indicating related information of the PSFCH by an SCI.

[0068] The related information is the number of PSFCHs corresponding to the PSSCHs, the time domain location of the PSFCH corresponding to the PSSCH, and and the time-frequency position of the PSFCH corresponding to the PSSCH.

[0069] Specifically, an indication field can be added in the SCI, and the indication field can carry the PSFCH related information.

[0070] In a specific embodiment, the SCI comprises: First-stage sidelink control information (SCI) carried by the PSCCH; and 2nd-stage SCI carried by the PSSCH.

[0071] Furthermore, in a specific embodiment, the method further comprises: transmitting the PSCCH and PSSCH on resources selected for PSSCH transmission; The step further includes a step of receiving on a PSFCH corresponding to the PSSCH, which specifically includes a step of sequentially receiving on a plurality of PSFCHs corresponding to the PSSCH until HARQ feedback information is successfully received.

[0072] In one alternative embodiment, the method comprises: If the HARQ feedback information carried by the PSFCH is successfully received, determining whether to perform the next PSSCH transmission based on the HARQ feedback information, specifically, canceling subsequent retransmission if the HARQ feedback information is ACK, and continuing to perform the next PSSCH transmission if the HARQ feedback information is NACK; and if the reception of the HARQ feedback information fails, continue to receive the HARQ feedback information at a transmission time of a subsequent PSFCH corresponding to the PSSCH. Here, the "subsequent PSFCH" is a PSFCH that is located after the PSFCH that carries the HARQ feedback information that could not be received, among multiple PSFCHs corresponding to the PSSCH.

[0073] Furthermore, as one alternative embodiment, the method further includes any one of the following (1) and (2):

[0074] (1) If reception of the HARQ feedback information fails and at least one PSFCH corresponding to the PSSCH (e.g., the last PSFCH corresponding to the PSSCH) is located after the adjacent next PSSCH transmission, the adjacent next PSSCH transmission is not performed.

[0075] That is, in this alternative embodiment, if at least one PSFCH corresponding to the current PSSCH transmission is located after the adjacent next PSSCH transmission, and if HARQ feedback information corresponding to the current PSSCH transmission cannot be received when the time of the adjacent next PSSCH transmission arrives, the adjacent next PSSCH transmission may not be transmitted, and the reception of the subsequent PSFCH corresponding to the current PSSCH transmission may be waited for. Taking FIG. 8 as an example, the resources for three PSSCH transmissions of one TB satisfy the transmission interval restriction in the related art. The first transmission is located in slot m0, corresponding to the two PSFCH feedback times. The first user equipment receives feedback information at time m1, and the possible situations are as follows: If an ACK is received, it cancels subsequent transmissions of the current TB. If a NACK is received, PSSCH retransmission continues at time m2. If the feedback information cannot be received, the second transmission (first PSSCH retransmission) is located before the second PSFCH corresponding to the first PSSCH transmission, so the first PSSCH retransmission at time m2 is canceled. Here, if the first PSSCH retransmission at time m2 is canceled due to failure to receive feedback information, the second user equipment may continue to receive the PSFCH at time m2. If ACK information is received at time m2, subsequent transmissions are canceled. If NACK information is received or feedback information is not received, the second PSSCH retransmission continues at time m3.

[0076] (2) If reception of the HARQ feedback information fails, perform the next adjacent PSSCH transmission. That is, if the first user equipment fails to receive HARQ feedback information, it does not need to continue waiting for the transmission of the subsequent PSFCH corresponding to the current PSSCH transmission, thereby reducing transmission delay. Note that performing the next adjacent PSSCH transmission here only means that the first user equipment can perform this operation, but also needs to consider whether it has received another PSFCH transmission before the next PSSCH transmission. For example, if the first user equipment has two PSFCH reception opportunities (targeting HARQ feedback information for the first PSSCH transmission) after the first PSSCH transmission and before the second PSSCH transmission, and the first user equipment fails to receive HARQ feedback information at the time of receiving the first PSFCH, the first user equipment may continue to receive HARQ feedback information at the time of receiving the second PSFCH. If the first user equipment still fails to receive HARQ feedback information at this time, the first user equipment may perform the second PSSCH transmission. However, if the first user equipment has only one PSFCH transmission after the first PSSCH transmission and before the second PSSCH transmission and fails to receive HARQ feedback information at the corresponding time, the first user equipment can directly perform the second PSSCH transmission. That is, the first user equipment determines whether to perform the second PSSCH transmission based on whether it has received HARQ feedback information at all PSFCH time instants between the first and second PSSCH transmissions.

[0077] Furthermore, if the first user equipment continues to perform subsequent PSSCH retransmissions, the number of retransmissions triggered by failure to receive feedback information must be less than or equal to a configured or preset first value.

[0078] As shown in Figure 3, the embodiment of the present disclosure further provides a sidelink resource selection method applied to a second user equipment, which includes the following steps:

[0079] In step 301, the PSCCH and PSSCH are received. Specifically, this step is to receive the PSCCH and PSSCH transmitted by the first user equipment, more specifically, to receive the PSSCH transmitted by the first user equipment, or to receive the PSCCH and PSSCH transmitted by the first user equipment. In step 302, HARQ feedback is performed on a PSFCH transmission corresponding to a PSSCH transmission. Here, the correspondence between the PSSCH transmission and the PSFCH transmission is One PSSCH transmission corresponds to M1 PSFCH transmissions located in different time units; and one PSSCH transmission corresponds to at most M2 PSFCH transmissions located in different time units; M1 and M2 are set or preset positive integers, and the PSFCH is used to carry HARQ feedback information.

[0080] In the sidelink resource selection method according to the embodiments of the present disclosure, the second user equipment first receives the PSCCH and the PSSCH, and then performs HARQ feedback in multiple PSFCH transmissions corresponding to the PSSCH transmissions, thereby realizing multiple PSFCH feedback opportunities between two adjacent PSSCH transmissions, effectively avoiding the problem of PSFCH transmission failure due to channel access failure, and further avoiding the waste of resources caused by excessive retransmission due to the PSFCH transmission failure, or the failure of the transmitting end to cancel subsequent retransmissions when the receiving end fails to receive the data packet.

[0081] Furthermore, in one alternative embodiment, the method further comprises: If the correspondence relationship is that one PSSCH transmission corresponds to at most M2 PSFCH transmissions located in different time units, the method further includes obtaining, based on the received SCI, related information of the PSFCH that actually corresponds to the PSSCH transmission.

[0082] The related information is the number of PSFCHs corresponding to the PSSCHs, the time domain location of the PSFCH corresponding to the PSSCH, and and the time-frequency position of the PSFCH corresponding to the PSSCH.

[0083] In this alternative embodiment, the transmission position of the PSFCH that actually corresponds to the PSSCH transmission can be determined based on the obtained related information, and HARQ feedback can be performed at the transmission position of the PSFCH.

[0084] In one alternative embodiment, the method comprises: determining a first resource to be used by a second PSFCH and HARQ feedback information to be carried by the second PSFCH when the first PSFCH fails to transmit HARQ feedback information successfully due to a channel access failure; transmitting the HARQ feedback information on the second PSFCH based on the first resource; The first PSFCH and the second PSFCH correspond to the same PSFCH, and the second PSFCH is located after the first PSFCH.

[0085] It should be noted that in this alternative embodiment, the step of transmitting the HARQ feedback information on the second PSFCH specifically refers to transmitting the HARQ feedback information on the second PSFCH if channel access is successful, that is, the step of transmitting the HARQ feedback information on the second PSFCH is premised on the second user equipment successfully accessing the channel.

[0086] In one alternative embodiment, the step of determining the first resource used by the second PSFCH and the HARQ feedback information carried by the second PSFCH comprises: determining the first resource based on a time-frequency location of a second resource used for the PSFCH transmission when a first condition is satisfied, wherein HARQ feedback information carried by the second PSFCH is the same as HARQ feedback information carried by the first PSFCH; The first condition is The next adjacent PSFCH transmission is located after the transmission time of the second PSFCH; and the next adjacent PSFCH transmission is located before the transmission time of the second PSFCH, and the first resource and the second resource do not satisfy a HARQ restriction condition.

[0087] It should be noted that in this alternative embodiment, the following points should be noted: First, the PSSCH transmission refers to the current PSSCH transmission. Second, the first resource is specifically the frequency domain resource of the second PSFCH transmission. Third, the HARQ feedback restriction condition may be understood as the time length indicated by "a" in the related art, or as not being able to transmit HARQ feedback information corresponding to the adjacent next PSSCH at the transmission time of the second PSFCH, taking into account the minimum time interval requirement between the PSSCH and the PSFCH. Therefore, in this alternative embodiment, specifically, when the adjacent next PSSCH transmission is located after the transmission time of the second PSFCH in the time domain, or when the adjacent next PSSCH transmission is located before the transmission time of the second PSFCH in the time domain and the time interval between them does not satisfy the HARQ restriction condition, the frequency domain resource of the second PSFCH is determined based on the time-frequency location information of the second resource used for the current PSSCH transmission, and also it is determined that the HARQ feedback information carried by the second PSFCH is the same as the HARQ feedback information carried by the first PSFCH.

[0088] In another alternative embodiment, the step of determining the first resource used by the second PSFCH and the HARQ feedback information carried by the second PSFCH comprises: If the next adjacent PSSCH transmission is located before the transmission time of the second PSFCH, and the interval between the next adjacent PSSCH transmission and the transmission time of the second PSFCH satisfies a HARQ restriction condition, determining the first resource based on time-frequency location information of a second resource used for the PSSCH transmission; and determining HARQ feedback information carried by the second PSFCH based on a decoding result for the PSSCH transmission; determining the first resource based on time-frequency location information of a third resource used by the adjacent next PSSCH transmission; and determining HARQ feedback information carried by the second PSFCH based on a decoding result of the adjacent next PSSCH transmission; and determining the first resource based on time-frequency positions of resources of Y PSSCH transmissions (Y is a set or preset positive integer) before the second PSFCH; and determining HARQ feedback information carried by the second PSFCH based on decoding results of the Y PSSCHs.

[0089] Similarly, in this alternative embodiment, firstly, the PSSCH transmission refers to the current PSSCH transmission, and secondly, the first resource is specifically the frequency domain resource of the second PSFCH transmission.

[0090] Note that the following should be noted about this optional embodiment. First, the HARQ feedback restriction condition is the time length indicated by "a" in the related art. Second, if the HARQ feedback restriction is satisfied between the current PSSCH transmission and the second PSFCH corresponding to the current PSSCH transmission, the second user equipment performs HARQ feedback at the feedback time of the second PSFCH based on the decoding result of the current PSSCH transmission and its time-frequency location, or performs HARQ feedback at the feedback time of the second PSFCH based on the time-frequency location of the resources used for the next adjacent PSSCH transmission and their decoding results, or performs HARQ feedback at the feedback time of the second PSFCH based on the time-frequency location of each resource used for the previous Y PSSCH transmissions and corresponding decoding results, in which case the second PSFCH carries multiple HARQ feedback information, and the Y PSSCH transmissions correspond to one HARQ feedback information each. Fifth, Y may be a positive integer less than or equal to M1 and / or less than or equal to M2; in particular, Y may be 2.

[0091] The above two alternative embodiments will be specifically described below with reference to FIG.

[0092] As shown in Figure 9, the transmitting end performs resource selection according to the time requirement constraint in the related art, and each transmission corresponds to two PSFCH transmissions. After the first PSSCH transmission, the receiving end determines HARQ feedback information based on the PSSCH decoding result. If the HARQ feedback information cannot be transmitted at the first PSFCH transmission time due to a channel access failure, the transmitting end will not receive any feedback information thereafter, so will perform a second PSSCH transmission (i.e., retransmission). The processing method of the receiving end may include the following methods:

[0093] In processing method 1, if the receiving end has already successfully decoded the initial transmission, it does not need to receive or decode the retransmission and simply transmits HARQ feedback information at the second PSFCH transmission time, where the feedback information is an ACK, and the transmission resource at the second PSFCH transmission time is selected based on the time-frequency information of the initial transmission. In processing method 2, if the decoding is not successful at the initial transmission, the receiving end needs to continue decoding for the retransmission, and then determine the HARQ feedback information to be transmitted at the second PSFCH transmission time according to the decoding result of the retransmission, and select the transmission resource for the second PSFCH transmission time according to the time-frequency information of the retransmission. In processing method 3, if the receiving end fails to successfully decode the initial transmission, it needs to continue decoding the retransmission. Then, at the second PSFCH transmission time, it simultaneously transmits HARQ feedback information corresponding to the initial transmission and HARQ feedback information corresponding to the retransmission, and respectively selects transmission resources for the second PSFCH transmission time according to the time-frequency information of the initial transmission and the retransmission.

[0094] The above-mentioned sidelink resource selection method according to the embodiments of the present disclosure can ensure that one PSFCH transmission corresponds to multiple PSFCH feedbacks. On the one hand, it can prevent PSFCH transmission failures due to channel access failures, thereby avoiding the following problems 1 and 2 caused by PSFCH transmission failures. Regarding problem 1, in the case of a NACK-only feedback scheme, if a NACK cannot be sent due to a channel access failure, the transmitting end user equipment (first user equipment) determines that the receiving end user equipment (second user equipment) has already successfully received the PSFCH and does not perform any further retransmissions, but in fact the receiving end has not successfully received the PSFCH. Regarding problem 2, in the case of an ACK / NACK feedback scheme, if the receiving end user equipment does not send any feedback information, the transmitting end user equipment may determine that the receiving end has failed, resulting in unnecessary transmissions. On the other hand, by dynamically adjusting the number of PSFCH transmissions, it is possible to minimize transmission delay and increase the number of resources indicated by the SCI, under the premise of simultaneously ensuring multiple PSFCH transmissions. Furthermore, the HARQ feedback scheme in the embodiments of the present disclosure can ensure that the receiving end user equipment makes full use of multiple PSFCH feedback opportunities, and can reduce unnecessary retransmissions.

[0095] Note that, in the embodiments of the present disclosure, the operations of performing PSSCH transmission, performing PSFCH transmission, transmitting PSSCH, transmitting PSFCH, etc. all refer to operations performed by the user equipment on the assumption that channel access is successful.

[0096] As shown in FIG. 10 , an embodiment of the present disclosure further provides a resource selection device for sidelink applied to a first user equipment. The resource selection device includes: The method includes a selection module 1001 for performing resource selection in a resource pool supporting HARQ feedback, where the selected resources are used for PSCCH transmission and PSSCH transmission. The correspondence relationship between the PSSCH transmission and the PSFCH transmission is: One PSSCH transmission corresponds to M1 PSFCH transmissions located in different time units; and one PSSCH transmission corresponds to at most M2 PSFCH transmissions located in different time units; M1 and M2 are set or preset positive integers, and the PSFCH is used to carry HARQ feedback information.

[0097] Optionally, the selected resources used for PSSCH transmission are: The time interval between any two resources used for the PSSCH transmission is equal to or greater than the HARQ feedback time; and the sidelink control information SCI indication restriction, which is used to restrict the range of time units in which the PSSCH transmission resource indicated by the SCI is located, is satisfied.

[0098] Optionally, the HARQ feedback time is a sum of a first duration and a second duration; the first time length is a PSFCH reception and processing time and a retransmission preparation time, The second length of time is: a time interval between the last symbol of a first resource of the two arbitrary resources used for the PSSCH transmission and the start symbol of a resource used for the last PSFCH transmission of the M1 PSFCH transmissions corresponding to the PSSCH transmission; and the time interval between the last symbol of the first of the two resources used for the PSSCH transmission and the start symbol of the resource used for the Nth (N is a positive integer equal to or less than M) PSFCH transmission corresponding to the PSSCH transmission.

[0099] Optionally, N is set, preset, or determined based on at least one of the maximum number of resources indicated by the SCI, the number of resources indicated by the SCI, the maximum spacing between resources indicated by the SCI, the period in which the PSFCH is set, the minimum time spacing between the PSSCH and the corresponding PSFCH, the reception and processing time of the PSFCH, the retransmission preparation time, and the channel occupancy time COT.

[0100] The selection module 1001 specifically includes: If the HARQ feedback time and the SCI indication restriction cannot be satisfied simultaneously, resource selection is performed according to one of the following principles: preferentially satisfying the HARQ feedback time, or preferentially satisfying the SCI indication restriction.

[0101] Optionally, when the selection module 1001 performs resource selection according to the principle of preferentially satisfying the SCI instruction constraint, specifically: adjusting the number of PSFCH transmissions corresponding to the PSSCH transmissions, where the number of PSFCH transmissions corresponding to the PSSCH transmissions is set, pre-set, or determined based on at least one of the maximum number of resources indicated by an SCI, the number of resources indicated by an SCI, the maximum interval between resources indicated by an SCI, a period in which a PSFCH is set, a minimum time interval between a PSSCH and a corresponding PSFCH, a PSFCH reception and processing time, a retransmission preparation time, and a COT; performing resource selection in the resource pool based on the determined number of PSFCH transmissions corresponding to the PSSCH transmission.

[0102] Optionally, the device comprises: Further comprising an indication module for indicating related information of the PSFCH through SCI; The related information is the number of PSFCHs corresponding to the PSSCHs, the time domain location of the PSFCH corresponding to the PSSCH, and and the time-frequency position of the PSFCH corresponding to the PSSCH.

[0103] Optionally, the SCI comprises: First-stage sidelink control information (SCI) carried by the PSCCH; and 2nd-stage SCI carried by the PSSCH.

[0104] Furthermore, the device a transmitting module for transmitting the PSCCH and PSSCH on resources selected for PSCCH and PSSCH transmission; and a receiving module for receiving a PSFCH corresponding to the PSSCH.

[0105] Additionally, the apparatus further includes a first processing module; The first processing module If the HARQ feedback information carried by the PSFCH is successfully received, determining whether to perform the next PSSCH transmission based on the HARQ feedback information; and if the reception of the HARQ feedback information fails, continue to receive the HARQ feedback information at a transmission time of a subsequent PSFCH corresponding to the PSSCH.

[0106] Additionally, the apparatus further includes a second processing module; The second processing module If the HARQ feedback information is not received and at least one PSFCH corresponding to the PSSCH is located after the next adjacent PSSCH transmission, not performing the next adjacent PSSCH transmission; and and performing the next adjacent PSSCH transmission if reception of the HARQ feedback information is unsuccessful.

[0107] As shown in FIG. 11 , an embodiment of the present disclosure further provides a resource selection device for sidelink applied to a second user equipment. The resource selection device includes: a receiving module 1101 configured to receive a PSCCH and a PSSCH; a first transmitting module 1102 configured to perform HARQ feedback on a PSFCH transmission corresponding to the PSSCH transmission; The correspondence relationship between the PSSCH transmission and the PSFCH transmission is: One PSSCH transmission corresponds to M1 PSFCH transmissions located in different time units; and one PSSCH transmission corresponds to at most M2 PSFCH transmissions located in different time units; M1 and M2 are set or preset positive integers, and the PSFCH is used to carry HARQ feedback information.

[0108] Furthermore, the device When the correspondence relationship is that one PSSCH transmission corresponds to at most M2 PSFCH transmissions located in different time units, further comprising an acquiring module configured to acquire, according to a received SCI, related information of a PSFCH that actually corresponds to the PSSCH transmission; The related information is the number of PSFCHs corresponding to the PSSCHs, the time domain location of the PSFCH corresponding to the PSSCH, and and the time-frequency position of the PSFCH corresponding to the PSSCH.

[0109] Furthermore, the device a determining module configured to determine a first resource used by a second PSFCH and HARQ feedback information carried by the second PSFCH when HARQ feedback information cannot be transmitted on a first PSFCH due to a channel access failure; a second transmission module configured to transmit the HARQ feedback information on the second PSFCH based on the first resource; The first PSFCH and the second PSFCH correspond to the same PSFCH, and the second PSFCH is located after the first PSFCH.

[0110] Optionally, the decision module specifically: configured to determine the first resource based on time-frequency location information of a second resource used for the PSFCH transmission when a first condition is satisfied, wherein HARQ feedback information carried by the second PSFCH is the same as HARQ feedback information carried by the first PSFCH; The first condition is The next adjacent PSFCH transmission is located after the transmission time of the second PSFCH; and the adjacent next PSSCH transmission is located before the transmission time of the second PSFCH, and the HARQ restriction condition is not satisfied between the adjacent next PSSCH transmission and the transmission time of the second PSFCH.

[0111] Optionally, the decision module specifically: If the next adjacent PSSCH transmission is located before the transmission time of the second PSFCH and the interval between the next adjacent PSSCH transmission and the transmission time of the second PSFCH satisfies a HARQ restriction condition, determining the first resource based on time-frequency location information of a second resource used for the PSSCH transmission; and determining HARQ feedback information carried by the second PSFCH based on a decoding result for the PSSCH transmission; determining the first resource based on time-frequency location information of a third resource used by the adjacent next PSSCH transmission; and determining HARQ feedback information carried by the second PSFCH based on a decoding result of the adjacent next PSSCH transmission; and determining the first resource based on time-frequency positions of resources of Y PSSCH transmissions (Y is a set or preset positive integer) before the second PSFCH; and determining HARQ feedback information to be carried by the second PSFCH based on decoding results of the Y PSSCHs.

[0112] As shown in FIG. 12, an embodiment of the present disclosure further provides a user equipment, which includes a processor 1200, a memory 1220, and a program stored in the memory 1220 and executable by the processor 1200, which, when executed by the processor 1200, realizes each step of the embodiment of the resource selection method for sidelink applied to the first user equipment or the second user equipment as described above, and can achieve the same technical effect, and to avoid elaboration, a description thereof will be omitted here.

[0113] The transceiver 1210 transmits and receives data under the control of the processor 1200 .

[0114] In FIG. 12 , the bus architecture may include any number of interconnected buses and bridges, specifically connecting various circuits such as one or more processors, represented by processor 1200, and memory, represented by memory 1220. The bus architecture may also connect various other circuits, such as peripherals, regulators, and power management circuits, all of which are well known in the art and will not be further described herein. The bus interface provides an interface. The transceiver 1210 may be multiple components, i.e., may include a transmitter and a receiver, and provides a unit for communicating with various other devices over a transmission medium. For different user devices, the user interface 1230 may be an interface that can be connected to necessary external or internal devices, including, but not limited to, a keypad, a display, a speaker, a microphone, a joystick, etc.

[0115] The processor 1200 manages the bus architecture and general processing, and the memory 1220 may store data used by the processor 1200 in performing operations.

[0116] In addition, the embodiments of the present disclosure further provide a computer-readable storage medium, which stores a computer program, which, when executed by a processor, can realize each step of the embodiment of the sidelink resource selection method described above and achieve the same technical effects. For avoidance of elaboration, the computer-readable storage medium may be a read-only memory (ROM), a random access memory (RAM), a magnetic disk, an optical disk, etc.

[0117] It should be noted that in the apparatus and method according to the present disclosure, each component or each step can obviously be disassembled and / or recombined. Such disassembly and / or recombination should be considered equivalent means of the present disclosure. Furthermore, the steps for performing the above-described series of processes may naturally be performed in the order described or in chronological order, but they are not necessarily required to be performed in chronological order, and some steps may be performed in parallel or separately. Those skilled in the art will recognize that the entire method and apparatus according to the present disclosure, or any of its steps or components, may be implemented in hardware, firmware, software, or a combination thereof in any computing device (including a processor, a storage medium, etc.) or a network of computing devices, and this implementation would be within the skill of a skilled artisan using their basic programming skills after reading the description of the present disclosure.

[0118] Thus, the objects of the present disclosure may be realized by executing a program or group of programs on any computing device. The computing device may be a well-known general-purpose device. Thus, the objects of the present disclosure may be realized by simply providing a program product including program code that implements the method or apparatus. In other words, such a program product constitutes the present disclosure, and a storage medium storing such a program product may also constitute the present disclosure. Needless to say, the storage medium may be any known storage medium or any storage medium developed in the future.

[0119] Finally, in this document, relational terms such as "first" and "second" are merely used to distinguish one entity or operation from another and do not necessarily require or imply any actual relationship or order between those entities or operations. Furthermore, the terms "comprise," "comprises," or any other variation thereof are intended to encompass a non-exclusive inclusion, whereby a process, method, article, or device comprising a set of elements further includes those elements as well as other elements not expressly listed or elements inherent in such process, method, article, or device. Unless further limited, limiting an element with "comprises a..." does not exclude the presence of other identical elements in the process, method, article, or device comprising said element.

[0120] Although the preferred embodiments of the present disclosure have been described above, those skilled in the art may make some improvements and modifications without departing from the principles of the present disclosure, and these improvements and modifications should also be considered as within the protection scope of the present disclosure.

Claims

1. 1. A method for selecting resources for a sidelink, applied to a first user equipment, comprising: performing resource selection in a resource pool supporting hybrid automatic repeat request (HARQ) feedback; the selected resources are used for a physical sidelink control channel (PSCCH) transmission and a physical sidelink shared channel (PSSCH) transmission; The correspondence relationship between the PSSCH transmission and the physical sidelink feedback channel (PSFCH) transmission is: One PSSCH transmission corresponds to M1 PSFCH transmissions located in different time units; and one PSSCH transmission corresponds to up to M2 PSFCH transmissions located in different time units; M1 and M2 are set or preset positive integers, and the PSFCH is used to carry HARQ feedback information. Resource selection method for sidelinking.

2. The resources selected for the PSSCH transmission are: The time interval between any two resources used for the PSSCH transmission is equal to or greater than the HARQ feedback time; and a sidelink control information (SCI) indication restriction, which is used to restrict the range of time units in which the PSSCH transmission resource indicated by the SCI is located; The method for selecting resources for a side link according to claim 1 .

3. the HARQ feedback time is a sum of a first time length and a second time length; the first time length is a time for receiving and processing a PSFCH and a time for preparing a retransmission, The second length of time is: a time interval between the last symbol of a first resource of the two resources used for the PSSCH transmission and the first symbol of a resource used for a last PSFCH transmission of the M1 PSFCH transmissions corresponding to the PSSCH transmission; and a time interval between the last symbol of a first resource of the two resources used for the PSSCH transmission and the start symbol of a resource used for an N-th PSFCH transmission corresponding to the PSSCH transmission; N is a positive integer equal to or less than M2; The method for selecting resources for a side link according to claim 2.

4. N is set, preset, or determined based on at least one of the maximum number of resources indicated by the SCI, the number of resources indicated by the SCI, the maximum interval between resources indicated by the SCI, the period in which the PSFCH is set, the minimum time interval between the PSSCH and the PSFCH corresponding to the PSSCH, the reception and processing time of the PSFCH, the retransmission preparation time, and the channel occupancy time COT. The method for selecting resources for a side link according to claim 3.

5. The step of selecting resources in a resource pool supporting hybrid automatic repeat request (HARQ) feedback as described above includes: When the HARQ feedback time and the SCI indication restriction cannot be satisfied simultaneously, selecting resources according to one of the following principles: preferentially satisfying the HARQ feedback time; and preferentially satisfying the SCI indication restriction. The method for selecting resources for a side link according to claim 2.

6. The step of selecting resources according to a principle of preferentially satisfying the SCI indication constraints includes: adjusting the number of PSFCH transmissions corresponding to the PSSCH transmissions, wherein the number of PSFCH transmissions corresponding to the PSSCH transmissions is configured, pre-configured, or determined based on at least one of the maximum number of resources indicated by an SCI, the number of resources indicated by an SCI, the maximum interval between resources indicated by an SCI, a period during which a PSFCH is configured, a minimum time interval between a PSSCH and a PSFCH corresponding to the PSSCH, a reception and processing time of a PSFCH, a retransmission preparation time, and a COT; and performing resource selection in the resource pool based on the determined number of PSFCH transmissions corresponding to the PSSCH transmission. The method for selecting resources for a side link according to claim 5.

7. The method for selecting resources for a sidelink comprises: Further comprising indicating related information of the PSFCH by an SCI; The related information is the number of PSFCHs corresponding to the PSSCHs, the time domain location of the PSFCH corresponding to the PSSCH, and a time-frequency position of the PSFCH corresponding to the PSSCH; The method for selecting resources for a side link according to claim 1 .

8. The method for selecting resources for a sidelink comprises: transmitting the PSCCH and PSSCH on resources selected for transmission of the PSCCH and PSSCH; receiving on a PSFCH corresponding to the PSSCH; The method for selecting resources for a side link according to claim 1 .

9. The method for selecting resources for a sidelink comprises: if the HARQ feedback information carried by the PSFCH is successfully received, determining whether to perform a next PSSCH transmission based on the HARQ feedback information; and if reception of the HARQ feedback information fails, continuing to receive the HARQ feedback information at a transmission time of a subsequent PSFCH corresponding to the PSSCH. The method for selecting resources for a side link according to claim 8.

10. The method for selecting resources for a sidelink comprises: If the HARQ feedback information is not received and at least one PSFCH corresponding to the PSSCH is located after the next adjacent PSSCH transmission, not performing the next adjacent PSSCH transmission; or If the HARQ feedback information is not received, performing the adjacent next PSSCH transmission. The method for selecting resources for a side link according to claim 8.

11. A method for selecting resources for a sidelink, applied to a second user equipment, comprising: receiving a PSCCH and a PSSCH; providing HARQ feedback in a PSFCH transmission corresponding to the PSSCH transmission; The correspondence relationship between the PSSCH transmission and the PSFCH transmission is: One PSSCH transmission corresponds to M1 PSFCH transmissions located in different time units; and one PSSCH transmission corresponds to up to M2 PSFCH transmissions located in different time units; M1 and M2 are set or preset positive integers, and the PSFCH is used to carry HARQ feedback information. Resource selection method for sidelinking.

12. The method for selecting resources for a sidelink comprises: If the correspondence relationship is that one PSSCH transmission corresponds to at most M2 PSFCH transmissions located in different time units, the method further includes: obtaining, based on a received SCI, related information of a PSFCH that actually corresponds to the PSSCH transmission; The related information is the number of PSFCHs corresponding to the PSSCHs, the time domain location of the PSFCH corresponding to the PSSCH, and a time-frequency position of the PSFCH corresponding to the PSSCH; The method for selecting resources for a sidelink according to claim 11.

13. The method for selecting resources for a sidelink comprises: determining a first resource to be used by a second PSFCH and HARQ feedback information to be carried by the second PSFCH when transmitting HARQ feedback information on the first PSFCH fails due to a channel access failure; transmitting the HARQ feedback information on the second PSFCH based on the first resource; the first PSFCH and the second PSFCH correspond to the same PSSCH, and the second PSFCH is located after the first PSFCH; The method for selecting resources for a sidelink according to claim 11.

14. determining a first resource used by a second PSFCH and HARQ feedback information carried by the second PSFCH, If a first condition is satisfied, determining the first resource based on time-frequency location information of a second resource used for the PSFCH transmission, and determining that HARQ feedback information carried by the second PSFCH is the same as HARQ feedback information carried by the first PSFCH; The first condition is The next adjacent PSFCH transmission is located after the transmission time of the second PSFCH; and an adjacent next PSSCH transmission is located before the transmission time of the second PSFCH, and a HARQ restriction condition is not satisfied between the adjacent next PSSCH transmission and the transmission time of the second PSFCH; The method for selecting resources for a side link according to claim 13.

15. determining a first resource used by a second PSFCH and HARQ feedback information carried by the second PSFCH, If an adjacent next PSSCH transmission is located before the transmission time of the second PSFCH and the interval between the adjacent next PSSCH transmission and the transmission time of the second PSFCH satisfies a HARQ restriction condition, determining the first resource based on time-frequency location information of a second resource used for the PSSCH transmission; and determining HARQ feedback information carried by the second PSFCH based on a decoding result for the PSSCH transmission; determining the first resource based on time-frequency location information of a third resource used by the adjacent next PSSCH transmission; and determining HARQ feedback information carried by the second PSFCH based on a decoding result of the adjacent next PSSCH transmission; and determining the first resource based on time-frequency locations of resources of Y PSSCH transmissions before the second PSFCH; and determining HARQ feedback information carried by the second PSFCH based on decoding results of the Y PSSCHs; Y is a set or preset positive integer; The method for selecting resources for a side link according to claim 13.

16. 1. A resource selection apparatus for a sidelink, applied to a first user equipment, comprising: a selection module configured to perform resource selection in a resource pool supporting HARQ feedback; The selected resources are used for PSCCH transmission and PSSCH transmission; The correspondence relationship between the PSSCH transmission and the PSFCH transmission is: One PSSCH transmission corresponds to M1 PSFCH transmissions located in different time units; and one PSSCH transmission corresponds to up to M2 PSFCH transmissions located in different time units; M1 and M2 are set or preset positive integers, and the PSFCH is used to carry HARQ feedback information. A resource selection device for sidelinks.

17. 1. A resource selection apparatus for a sidelink, applied to a second user equipment, comprising: a receiving module configured to receive a PSCCH and a PSSCH; a first transmitting module configured to perform HARQ feedback in a PSFCH transmission corresponding to the PSSCH transmission; The correspondence relationship between the PSSCH transmission and the PSFCH transmission is: One PSSCH transmission corresponds to M1 PSFCH transmissions located in different time units; and one PSSCH transmission corresponds to up to M2 PSFCH transmissions located in different time units; M1 and M2 are set or preset positive integers, and the PSFCH is used to carry HARQ feedback information. A resource selection device for sidelinks.

18. A user equipment, a transceiver, a memory, a processor, and a computer program stored in the memory and executed by the processor; When the processor executes the computer program, the processor realizes the resource selection method for a side link according to any one of claims 1 to 10 or the resource selection method for a side link according to any one of claims 11 to 15. User equipment.

19. A computer program is stored The computer program, when executed by a processor, realizes the resource selection method for a side link according to any one of claims 1 to 10 or the resource selection method for a side link according to any one of claims 11 to 15. A computer-readable storage medium.

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