Information feedback method and communication device

Abstract

Provided are an information feedback method and a communication device, the method comprising: a first UE receiving a first PSSCH multicast by a second UE to a UE group, the first UE being one in the UE group, the UE group comprising a plurality of UEs; the first UE does not transmit HARQ feedback information corresponding to the first PSSCH to the second UE under the condition that the first parameter is greater than the number of to-be-selected resources of the PSFCH, or the first UE only transmits a common part on the PSFCH corresponding to the first PSSCH; wherein the first parameter is obtained according to the member identifier of the first UE or the number of the UEs included in the UE group or the sequence number of the first UE in the UE group. Visibly, based on the method, the first UE can not send the HARQ feedback information corresponding to the first PSSCH when the number of the to-be-selected resources of the PSFCH is insufficient, so that the situation that a plurality of UEs occupy one to-be-selected resource of the PSFCH can be avoided.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to an information feedback method and a communication device. Background Art

[0002] The hybrid automatic repeat request (HARQ) feedback information of a physical sidelink shared channel (PSSCH) is transmitted by the physical sidelink feedback channel (PSFCH). SL HARQ feedback is only supported in unicast and multicast scenarios. The specific information transmitted is as follows:

[0003] Unicast: If decoding of the PSSCH transport block is successful, the receiving UE transmits a hybrid automatic repeat request-Acknowledgement (HARQ-ACK); if decoding fails, the receiving UE transmits a hybrid automatic repeat request-negative-acknowledgment (HARQ-NACK).

[0004] There are two options for multicast:

[0005] Option 1: After decoding the PSCCH, if the decoding fails, the receiving UE transmits HARQ-NACK, and does not transmit signals in other cases. All receiving UEs in a group are supported to share the same PSFCH resource.

[0006] Option 2: If decoding is successful, the receiving UE transmits HARQ-ACK, and if decoding fails, the receiving UE transmits HARQ-NACK. Each UE is supported to use a separate PSFCH resource.

[0007] Sidelink unlicense (SL-U) is an important topic discussed in the R18 standard. The main content is to perform sidelink transmission in the unlicensed spectrum. During the SL-U discussion, some companies have been opposed to Option 1 for multicast. It is possible that SL-U will not support Option 1 for multicast in the future. Option 2 that only supports multicast may cause insufficient PSFCH feedback resources. When PSFCH feedback resources are insufficient, how to reasonably handle HARQ feedback is a technical problem that needs to be solved urgently. Summary of the invention

[0008] The present application provides an information feedback method and a communication device, which can reasonably process HARQ feedback when PSFCH feedback resources are insufficient.

[0009] In a first aspect, the present application provides an information feedback method, the method comprising:

[0010] A first user equipment UE receives a first physical direct link shared channel PSSCH multicast by a second UE to a UE group, the first UE is one of the UE group, and the UE group includes multiple UEs; when a first parameter is greater than the number of candidate resources for a physical direct link feedback channel PSFCH, the first UE does not transmit hybrid automatic repeat request HARQ feedback information corresponding to the first PSSCH to the second UE, or the first UE only transmits a common part on the PSFCH corresponding to the first PSSCH; wherein the first parameter is obtained according to a member identifier of the first UE, the number of UEs included in the UE group, or an arrangement sequence number of the first UE in the UE group.

[0011] It can be seen that based on the method described in the first aspect, the first UE can not send the HARQ feedback information corresponding to the first PSSCH when the number of PSFCH candidate resources is insufficient, thereby avoiding the situation where multiple UEs occupy one PSFCH candidate resource, and making the second UE more distinguishable from the situation where the UE in the UE group receives the first PSSCH. Therefore, based on the method described in the first aspect, when the number of PSFCH candidate resources is insufficient, HARQ feedback can be reasonably processed.

[0012] In a possible embodiment, the first PSSCH carries indication information, where the indication information indicates enabling HARQ feedback.

[0013] Based on this possible embodiment, even if HARQ feedback is enabled, the first UE may not send HARQ feedback information corresponding to the first PSSCH when the number of PSFCH candidate resources is insufficient, thereby avoiding the situation where multiple UEs occupy one PSFCH candidate resource, and making the second UE more discriminating about the situation where the UE in the UE group receives the first PSSCH.

[0014] In a possible embodiment, the first parameter is obtained according to a member identifier of the first UE or an arrangement sequence number of the first UE in the UE group.

[0015] When the first parameter is less than or equal to the number of PSFCH selected resources, the first UE determines the PSFCH resources corresponding to the first UE from the PSFCH selected resources based on the member identifier of the first UE; the first UE sends the first PSFCH to the second UE on the PSFCH resources corresponding to the first UE, and the first PSFCH carries the HARQ feedback information corresponding to the first PSSCH.

[0016] Based on this possible embodiment, when the first parameter is less than or equal to the number of PSFCH candidate resources, the first UE can perform HARQ feedback normally.

[0017] In a possible embodiment, when the first parameter is greater than the number of PSFCH candidate resources, it is determined not to enable HARQ feedback.

[0018] In a possible embodiment, when the first parameter is less than or equal to the number of PSFCH candidate resources, it is determined to enable HARQ feedback.

[0019] In a possible embodiment, the first parameter is obtained according to the number of UEs included in the UE group;

[0020] When the first parameter is greater than the number of PSFCH candidate resources, the first UE does not transmit HARQ feedback information corresponding to the first PSSCH to the second UE, or the first UE transmits only the common part on the PSFCH corresponding to the first PSSCH, including:

[0021] When the first parameter is greater than the number of PSFCH resources to be selected, and the member identifier of the first UE or the arrangement number of the first UE in the UE group is greater than the number of PSFCH resources to be selected, the first UE does not transmit the HARQ feedback information corresponding to the first PSSCH to the second UE, or the first UE only transmits the common part on the PSFCH corresponding to the first PSSCH.

[0022] Based on this possible embodiment, even if HARQ feedback is enabled, the first UE may not send HARQ feedback information corresponding to the first PSSCH when the number of UEs included in the UE group is greater than the number of PSFCH candidate resources and the member identifier of the first UE or the arrangement sequence number of the first UE in the UE group is greater than the number of PSFCH candidate resources, thereby avoiding the situation where multiple UEs occupy one PSFCH candidate resource and allowing the second UE to more distinguish the situation where the UE in the UE group receives the first PSSCH.

[0023] In a possible embodiment, when the first parameter is greater than the number of PSFCH resources to be selected, and the member identifier of the first UE or the arrangement number of the first UE in the UE group is less than or equal to the number of PSFCH resources to be selected, the first UE determines the PSFCH resources corresponding to the first UE from the PSFCH resources to be selected based on the member identifier of the first UE; the first UE sends a first PSFCH to the second UE on the PSFCH resources corresponding to the first UE, and the first PSFCH carries the HARQ feedback information corresponding to the first PSSCH.

[0024] Based on this possible embodiment, the first UE can perform HARQ feedback normally when the number of UEs included in the UE group is greater than the number of PSFCH candidate resources, and the member identifier of the first UE or the arrangement sequence number of the first UE in the UE group is less than or equal to the number of PSFCH candidate resources.

[0025] In a possible embodiment, when the first parameter is greater than the number of PSFCH candidate resources and the member identifier of the first UE or the arrangement sequence number of the first UE in the UE group is greater than the number of PSFCH candidate resources, the first UE determines not to enable HARQ feedback.

[0026] In a possible embodiment, when the first parameter is greater than the number of PSFCH candidate resources and the member identifier of the first UE or the arrangement sequence number of the first UE in the UE group is less than or equal to the number of PSFCH candidate resources, the first UE determines to enable HARQ feedback.

[0027] In a possible embodiment, the first parameter is obtained according to the number of UEs included in the UE group; the first PSSCH carries indication information; when the first parameter is greater than the number of PSFCH selectable resources, the indication information indicates that HARQ feedback is not enabled.

[0028] Based on this possible embodiment, the second UE can indicate that HARQ feedback is not enabled when the number of UEs included in the UE group is greater than the number of PSFCH candidate resources, thereby avoiding the situation where multiple UEs occupy one PSFCH candidate resource, and making the second UE more discriminating about the situation where the UE in the UE group receives the first PSSCH.

[0029] In a possible embodiment, when the first parameter is less than or equal to the number of PSFCH candidate resources, the indication information indicates enabling HARQ feedback.

[0030] Based on this possible embodiment, when the first parameter is less than or equal to the number of PSFCH candidate resources, the first UE can perform HARQ feedback normally.

[0031] In a possible embodiment, when the first parameter is greater than the number of PSFCH resources to be selected, the first UE does not transmit the HARQ feedback information corresponding to the first PSSCH to the second UE, or the first UE only transmits the common part on the PSFCH corresponding to the first PSSCH, including: when the first parameter is greater than the number of PSFCH resources to be selected, and the member identifier of the first UE or the arrangement sequence number of the first UE in the UE group is greater than the number of PSFCH resources to be selected, the first UE does not transmit the HARQ feedback information corresponding to the first PSSCH to the second UE, or the first UE only transmits the common part on the PSFCH corresponding to the first PSSCH.

[0032] Based on this possible embodiment, even if HARQ feedback is enabled, the first UE may not send HARQ feedback information corresponding to the first PSSCH when the number of UEs included in the UE group is greater than the number of PSFCH candidate resources and the member identifier of the first UE or the arrangement sequence number of the first UE in the UE group is greater than the number of PSFCH candidate resources, thereby avoiding the situation where multiple UEs occupy one PSFCH candidate resource and allowing the second UE to more distinguish the situation where the UE in the UE group receives the first PSSCH.

[0033] In a possible embodiment, when the first parameter is greater than the number of PSFCH resources to be selected, and the member identifier of the first UE or the arrangement number of the first UE in the UE group is less than or equal to the number of PSFCH resources to be selected, the first UE determines the PSFCH resources corresponding to the first UE from the PSFCH resources to be selected based on the member identifier of the first UE; the first UE sends a first PSFCH to the second UE on the PSFCH resources corresponding to the first UE, and the first PSFCH carries the HARQ feedback information corresponding to the first PSSCH.

[0034] Based on this possible embodiment, the first UE can perform HARQ feedback normally when the number of UEs included in the UE group is greater than the number of PSFCH candidate resources, and the member identifier of the first UE or the arrangement sequence number of the first UE in the UE group is less than or equal to the number of PSFCH candidate resources.

[0035] In a possible embodiment, the first parameter is obtained according to the member identifier of the first UE or the number of UEs included in the UE group or the arrangement number of the first UE in the UE group, including: the first parameter is the member identifier of the first UE or the number of UEs included in the UE group or the arrangement number of the first UE in the UE group.

[0036] In a possible embodiment, the first UE receives the first PSSCH multicast by the second UE to the UE group, including: the first UE receives the first PSSCH multicast by the second UE to the UE group in a shared spectrum or an unlicensed spectrum.

[0037] In a second aspect, the present application provides an information feedback method, the method comprising:

[0038] The second user equipment UE multicasts the first physical direct link shared channel PSSCH to the UE group, and the UE group includes multiple UEs; when the first parameter is greater than the number of candidate resources for the physical direct link feedback channel PSFCH, the second UE does not detect the hybrid automatic repeat request HARQ feedback information corresponding to the first PSSCH from the first UE, or the second UE receives the common part transmitted only by the first UE on the PSFCH corresponding to the first PSSCH; wherein the first parameter is obtained according to the member identifier of the first UE or the number of UEs included in the UE group or the arrangement sequence number of the first UE in the UE group, and the first UE is one of the UE group.

[0039] In a possible embodiment, the first PSSCH carries indication information, where the indication information indicates enabling HARQ feedback.

[0040] In a possible embodiment, the first parameter is obtained according to a member identifier of the first UE or an arrangement sequence number of the first UE in the UE group.

[0041] When the first parameter is less than or equal to the number of PSFCH candidate resources, the second UE determines the PSFCH resources corresponding to the first UE from the PSFCH candidate resources based on the member identifier of the first UE; the second UE receives the first PSFCH sent by the first UE on the PSFCH resources corresponding to the first UE, and the first PSFCH carries the HARQ feedback information corresponding to the first PSSCH.

[0042] In a possible embodiment, the first parameter is obtained according to the number of UEs included in the UE group;

[0043] When the first parameter is greater than the number of PSFCH candidate resources, the second UE does not detect the HARQ feedback information corresponding to the first PSSCH from the first UE, or the second UE receives only the common part transmitted by the first UE on the PSFCH corresponding to the first PSSCH, including:

[0044] When the first parameter is greater than the number of PSFCH resources to be selected, and the member identifier of the first UE or the arrangement number of the first UE in the UE group is greater than the number of PSFCH resources to be selected, the second UE does not detect the HARQ feedback information corresponding to the first PSSCH from the first UE, or the second UE receives the common part transmitted only by the first UE on the PSFCH corresponding to the first PSSCH.

[0045] In a possible embodiment, when the first parameter is greater than the number of PSFCH resources to be selected, and the member identifier of the first UE or the arrangement number of the first UE in the UE group is less than or equal to the number of PSFCH resources to be selected, the second UE determines the PSFCH resources corresponding to the first UE from the PSFCH resources to be selected based on the member identifier of the first UE; the second UE receives the first PSFCH sent by the first UE on the PSFCH resources corresponding to the first UE, and the first PSFCH carries the HARQ feedback information corresponding to the first PSSCH.

[0046] In a possible embodiment, the first parameter is obtained according to the number of UEs included in the UE group;

[0047] The first PSSCH carries indication information; when the first parameter is greater than the number of PSFCH candidate resources, the indication information indicates that HARQ feedback is not enabled.

[0048] In a possible embodiment, when the first parameter is less than or equal to the number of PSFCH candidate resources, the indication information indicates enabling HARQ feedback.

[0049] In a possible embodiment, when the first parameter is greater than the number of PSFCH candidate resources, the second UE does not detect the HARQ feedback information corresponding to the first PSSCH from the first UE, or the second UE receives only the common part transmitted by the first UE on the PSFCH corresponding to the first PSSCH, including:

[0050] When the first parameter is greater than the number of PSFCH resources to be selected, and the member identifier of the first UE or the arrangement number of the first UE in the UE group is greater than the number of PSFCH resources to be selected, the second UE does not detect the HARQ feedback information corresponding to the first PSSCH from the first UE, or the second UE receives the common part transmitted only by the first UE on the PSFCH corresponding to the first PSSCH.

[0051] In a possible embodiment, when the first parameter is greater than the number of PSFCH resources to be selected, and the member identifier of the first UE or the arrangement number of the first UE in the UE group is less than or equal to the number of PSFCH resources to be selected, the second UE determines the PSFCH resources corresponding to the first UE from the PSFCH resources to be selected based on the member identifier of the first UE; the second UE receives the first PSFCH sent by the first UE on the PSFCH resources corresponding to the first UE, and the first PSFCH carries the HARQ feedback information corresponding to the first PSSCH.

[0052] In a possible embodiment, the first parameter is obtained according to the member identifier of the first UE or the number of UEs included in the UE group or the arrangement number of the first UE in the UE group, including: the first parameter is the member identifier of the first UE or the number of UEs included in the UE group or the arrangement number of the first UE in the UE group.

[0053] In a possible embodiment, the second UE multicasts the first PSSCH to the UE group, including: the second UE multicasts the first PSSCH to the UE group in a shared spectrum or an unlicensed spectrum.

[0054] The beneficial effects of the second aspect can refer to the beneficial effects of the first aspect, which will not be repeated here.

[0055] In a third aspect, the present application provides an information feedback method, the method comprising:

[0056] The first UE receives the first PSSCH multicast by the second UE to the UE group, the first UE is one of the UE group, the UE group includes multiple UEs, and the first PSSCH carries indication information, which indicates enabling HARQ feedback; when the first parameter is greater than the number of candidate resources for the physical direct link feedback channel PSFCH, the first UE determines the first PSFCH resource corresponding to the first UE from the PSFCH candidate resources; the first parameter is obtained according to the first member identifier of the first UE or the number of UEs included in the UE group or the arrangement sequence number of the first UE in the UE group; the first UE sends the first PSFCH to the second UE on the first PSFCH resource corresponding to the first UE, and the first PSFCH carries the HARQ feedback information corresponding to the first PSSCH.

[0057] It can be seen that based on the method described in the third aspect, even if the first parameter is greater than the number of PSFCH candidate resources, the first UE can also select a PSFCH resource for HARQ feedback, which is more distinguishable than the existing Option 1 where all UEs occupy one PSFCH resource. Even if multiple UEs occupy one PSFCH resource, some UEs may still occupy one PSFCH resource alone. Therefore, based on the method described in the third aspect, when the number of PSFCH candidate resources is insufficient, HARQ feedback can be reasonably processed.

[0058] In a possible embodiment, the first UE determines a first PSFCH resource corresponding to the first UE from PSFCH candidate resources, including:

[0059] A first PSFCH resource corresponding to the first UE is determined from PSFCH candidate resources based on the first member identifier of the first UE.

[0060] Determining the PSFCH resource selection based on the first member identifier of the first UE is conducive to making the PSFCH resources multiplexed by different UEs more dispersed, avoiding all UEs that need to multiplex PSFCH resources from selecting the same PSFCH resource, and making the load on different PSFCH resources more uniform.

[0061] In a possible embodiment, the first UE determines a first PSFCH resource corresponding to the first UE from PSFCH candidate resources, including:

[0062] The first UE obtains the second member identifier of the first UE; the first UE determines the first PSFCH resource corresponding to the first UE from the PSFCH candidate resources based on the second member identifier of the first UE.

[0063] In a possible embodiment, the second member identifier of the first UE is determined based on the first member identifier of the first UE and the number of PSFCH selectable resources;

[0064] Alternatively, the second member identifier of the first UE is a fixed value predefined by a protocol;

[0065] Alternatively, the second member identifier of the first UE is a random value in [0, number of PSFCH selected resources - 1].

[0066] Determining the second member identifier based on the first member identifier of the first UE and the number of PSFCH resources to be selected is conducive to making the PSFCH resources multiplexed by different UEs more dispersed, avoiding all UEs that need to multiplex PSFCH resources from selecting the same PSFCH resource, and making the load on different PSFCH resources more uniform.

[0067] By setting the second member identifier of the first UE to a fixed value, all UEs that need to multiplex PSFCH resources can select the same PSFCH resource. This allows more UEs to occupy a PSFCH resource alone, making it easier for the second UE to distinguish the situation in which the UE in the UE group receives the first PSSCH.

[0068] By making the second member identifier of the first UE a random value, the PSFCH resources multiplexed by different UEs can be more dispersed, avoiding all UEs that need to multiplex PSFCH resources from selecting the same PSFCH resource, and making the load on different PSFCH resources more uniform.

[0069] In a possible embodiment, the first parameter is obtained according to the first member identifier of the first UE or the arrangement sequence number of the first UE in the UE group.

[0070] When the first parameter is less than or equal to the number of PSFCH selected resources, the first UE can also determine the second PSFCH resource corresponding to the first UE from the PSFCH selected resources based on the first member identifier of the first UE; the first UE sends the first PSFCH to the second UE on the second PSFCH resource corresponding to the first UE.

[0071] Based on this possible embodiment, when the first parameter is less than or equal to the number of PSFCH candidate resources, the first UE can perform HARQ feedback normally.

[0072] In a possible embodiment, the first parameter is obtained according to the number of UEs included in the UE group;

[0073] When the first parameter is greater than the number of PSFCH candidate resources, the first UE determines a first PSFCH resource corresponding to the first UE from the PSFCH candidate resources, including:

[0074] When the first parameter is greater than the number of PSFCH candidate resources and the member identifier of the first UE or the arrangement number of the first UE in the UE group is greater than the number of PSFCH candidate resources, the first UE determines the first PSFCH resource corresponding to the first UE from the PSFCH candidate resources.

[0075] Based on this possible embodiment, even when the first parameter is greater than the number of PSFCH resources to be selected, and the member identifier of the first UE or the arrangement number of the first UE in the UE group is greater than the number of PSFCH resources to be selected, the first UE can also select a PSFCH resource for HARQ feedback. Compared with the existing Option 1 where all UEs occupy one PSFCH resource, it is more distinguishable. Even if multiple UEs occupy one PSFCH resource, some UEs may still occupy one PSFCH resource alone.

[0076] In a possible embodiment, when the first parameter is greater than the number of PSFCH resources for selection, and the member identifier of the first UE or the arrangement number of the first UE in the UE group is less than or equal to the number of PSFCH resources for selection, the first UE can also determine the second PSFCH resource corresponding to the first UE from the PSFCH resources for selection based on the first member identifier of the first UE; the first UE sends the first PSFCH to the second UE on the second PSFCH resource corresponding to the first UE.

[0077] Based on this possible embodiment, when the first parameter is greater than the number of PSFCH candidate resources, and the member identifier of the first UE or the arrangement sequence number of the first UE in the UE group is less than or equal to the number of PSFCH candidate resources, the first UE can perform HARQ feedback normally.

[0078] In a possible embodiment, when the first parameter is greater than the number of PSFCH candidate resources and the HARQ feedback information is HARQ-ACK information, the first UE may also transmit the common part on the PSFCH corresponding to the first PSSCH.

[0079] In a possible embodiment, the first UE sends a first PSFCH to the second UE on a first PSFCH resource corresponding to the first UE, including:

[0080] When the HARQ feedback information is HARQ-NACK information, the first UE sends a first PSFCH to the second UE on a first PSFCH resource corresponding to the first UE;

[0081] The method also includes:

[0082] When the first parameter is greater than the number of PSFCH candidate resources and the HARQ feedback information is HARQ-ACK information, the first UE transmits the common part only on the PSFCH corresponding to the first PSSCH.

[0083] In a possible embodiment, when the first parameter is greater than the number of PSFCH candidate resources and the HARQ feedback information is HARQ-NACK information, the first UE may also transmit the common part on the PSFCH corresponding to the first PSSCH.

[0084] In a possible embodiment, the first parameter is obtained according to the member identifier of the first UE or the number of UEs included in the UE group or the arrangement number of the first UE in the UE group, including: the first parameter is the member identifier of the first UE or the number of UEs included in the UE group or the arrangement number of the first UE in the UE group.

[0085] In a possible embodiment, the first UE receives the first PSSCH multicast by the second UE to the UE group, including: the first UE receives the first PSSCH multicast by the second UE to the UE group in a shared spectrum or an unlicensed spectrum.

[0086] In a fourth aspect, the present application provides an information feedback method, the method comprising:

[0087] The second UE multicasts the first physical direct link shared channel PSSCH to the UE group, the UE group includes multiple UEs, the first UE is one of the UE group, and the first PSSCH carries indication information, which indicates enabling HARQ feedback; when the first parameter is greater than the number of candidate resources for the physical direct link feedback channel PSFCH, the second UE receives the first PSFCH sent by the first UE on the first PSFCH resource corresponding to the first UE, and the first PSFCH carries the HARQ feedback information corresponding to the first PSSCH; wherein the first parameter is obtained according to the first member identifier of the first UE or the number of UEs included in the UE group or the arrangement sequence number of the first UE in the UE group.

[0088] In a possible embodiment, when the first parameter is greater than the number of PSFCH candidate resources, the second UE may also determine the first PSFCH resource corresponding to the first UE from the PSFCH candidate resources.

[0089] In a possible embodiment, the second UE determines the first PSFCH resource corresponding to the first UE from the PSFCH candidate resources, including:

[0090] The second UE determines a first PSFCH resource corresponding to the first UE from PSFCH candidate resources based on the first member identifier of the first UE.

[0091] In a possible embodiment, the second UE determines the first PSFCH resource corresponding to the first UE from the PSFCH candidate resources, including:

[0092] The second UE obtains the second member identifier of the first UE; the second UE determines the first PSFCH resource corresponding to the first UE from the PSFCH candidate resources based on the second member identifier of the first UE.

[0093] In a possible embodiment, the second member identifier of the first UE is determined based on the first member identifier of the first UE and the number of PSFCH selectable resources;

[0094] Alternatively, the second member identifier of the first UE is a fixed value predefined by a protocol.

[0095] In a possible embodiment, the first parameter is obtained according to the first member identifier of the first UE or the arrangement sequence number of the first UE in the UE group. When the first parameter is less than or equal to the number of PSFCH selected resources, the second UE can also determine the second PSFCH resource corresponding to the first UE from the PSFCH selected resources based on the first member identifier of the first UE; the second UE receives the first PSFCH sent by the first UE on the first PSFCH resource corresponding to the first UE.

[0096] In a possible embodiment, the first parameter is obtained according to the number of UEs included in the UE group;

[0097] When the first parameter is greater than the number of PSFCH candidate resources, the second UE receives the first PSFCH sent by the first UE on the first PSFCH resource corresponding to the first UE, including:

[0098] When the first parameter is greater than the number of PSFCH resources to be selected and the member identifier of the first UE or the arrangement number of the first UE in the UE group is greater than the number of PSFCH resources to be selected, the second UE receives the first PSFCH sent by the first UE on the first PSFCH resource corresponding to the first UE.

[0099] In a possible embodiment, when the first parameter is greater than the number of PSFCH resources for selection, and the member identifier of the first UE or the arrangement number of the first UE in the UE group is less than or equal to the number of PSFCH resources for selection, the second UE can also determine the second PSFCH resource corresponding to the first UE from the PSFCH resources for selection based on the first member identifier of the first UE; the second UE receives the first PSFCH sent by the first UE on the first PSFCH resource corresponding to the first UE.

[0100] In a possible embodiment, when the first parameter is greater than the number of PSFCH candidate resources and the HARQ feedback information is HARQ-ACK information, the second UE can also receive the common part transmitted by the first UE on the PSFCH corresponding to the first PSSCH.

[0101] In a possible embodiment, the second UE receives, on the first PSFCH resource corresponding to the first UE, a first PSFCH sent by the first UE, including:

[0102] When the HARQ feedback information is HARQ-NACK information, the second UE receives the first PSFCH sent by the first UE on the first PSFCH resource corresponding to the first UE;

[0103] The method also includes:

[0104] When the first parameter is greater than the number of PSFCH candidate resources and the HARQ feedback information is HARQ-ACK information, the second UE receives only the common part transmitted by the first UE on the PSFCH corresponding to the first PSSCH.

[0105] In a possible embodiment, when the first parameter is greater than the number of PSFCH candidate resources and the HARQ feedback information is HARQ-NACK information, the second UE may also receive the common part transmitted by the first UE on the PSFCH corresponding to the first PSSCH.

[0106] In a possible embodiment, if all HARQ feedback information corresponding to the received first PSSCH is HARQ-ACK information, the second UE may also report an ACK value to the upper layer; otherwise, the second UE may also report a NACK value to the upper layer.

[0107] In a possible embodiment, the first parameter is obtained according to the member identifier of the first UE or the number of UEs included in the UE group or the arrangement number of the first UE in the UE group, including: the first parameter is the member identifier of the first UE or the number of UEs included in the UE group or the arrangement number of the first UE in the UE group.

[0108] In a possible embodiment, the second UE multicasts the first PSSCH to the UE group, including: the second UE multicasts the first PSSCH to the UE group in a shared spectrum or an unlicensed spectrum.

[0109] The beneficial effects of the fourth aspect can refer to the beneficial effects of the third aspect, which will not be repeated here.

[0110] In a fifth aspect, the present application provides a communication device, for example, the communication device may be a first UE or a module applied to the first UE, such as a processor, a chip, or a chip system, and may also be a logical node, a logical module, or software that can implement all or part of the functions of the first UE. For another example, the communication device may be a module of a second UE, such as a processor, a chip, or a chip system, and may also be a logical node, a logical module, or software that can implement all or part of the functions of the second UE. The communication device includes a module / unit for executing any method in the first aspect to the fourth aspect and its possible implementation.

[0111] In a sixth aspect, the present application provides a communication device, comprising a processor, wherein the processor is coupled to a memory, and the memory is used to store programs or instructions. When the program or instructions are executed by the processor, the device executes the method described in any one of the first to fourth aspects above.

[0112] In the seventh aspect, the present application provides a chip, which includes a processor and an interface, and the processor and the interface are coupled; the interface is used to receive or output signals, and the processor is used to execute code instructions, so that the chip executes the method described in any one of the first to fourth aspects above.

[0113] In an eighth aspect, the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores computer-executable instructions, and when the computer-executable instructions are called, any one of the above-mentioned first to fourth aspects is executed.

[0114] In a ninth aspect, the present application provides a computer program product, comprising: a computer program code, wherein when the computer program code is executed, any one of the above-mentioned first to fourth aspects is executed.

[0115] In a tenth aspect, the present application provides a communication system, the communication system comprising a first UE for executing the method described in the first aspect and a second UE for executing the method described in the second aspect. Alternatively, the communication system comprises a first UE for executing the method described in the third aspect and a second UE for executing the method described in the fourth aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0116] Figure 1 A schematic diagram of the architecture of a communication system provided for this application;

[0117] Figure 2 A flowchart of an information feedback method provided for this application;

[0118] Figure 3 A flowchart of an information feedback method provided for this application;

[0119] Figure 4 A flowchart of an information feedback method provided for this application;

[0120] Figure 5 A flowchart of an information feedback method provided for this application;

[0121] Figure 6 A flowchart of an information feedback method provided for this application;

[0122] Figure 7 A flowchart of an information feedback method provided for this application;

[0123] Figure 8 A flowchart of an information feedback method provided for this application;

[0124] Fig. 9 A schematic diagram of the structure of a communication device 900 provided in this application;

[0125] Fig.10 A schematic diagram of the structure of another communication device 1000 provided in the present application. DETAILED DESCRIPTION

[0126] The specific embodiments of the present application are further described in detail below in conjunction with the accompanying drawings.

[0127] The terms "first" and "second" and the like in the specification, claims and drawings of this application are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device comprising a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products or devices.

[0128] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0129] In the present application, "at least one (item)" means one or more, "more than one" means two or more, "at least two (items)" means two or three and more than three, and "and / or" is used to describe the association relationship of associated objects, indicating that three relationships may exist. For example, "A and / or B" can mean: only A exists, only B exists, and A and B exist at the same time, where A and B can be singular or plural. The character " / " generally indicates that the previous and next associated objects are in an "or" relationship. "At least one of the following items" or similar expressions refers to any combination of these items, including any combination of single items or plural items. For example, at least one of a, b or c can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, c can be single or multiple.

[0130] In order to reasonably process HARQ feedback when PSFCH feedback resources are insufficient, the embodiment of the present application provides an information feedback method and a communication device. In order to better understand the embodiment of the present application, the system architecture involved in the embodiment of the present application is first introduced below:

[0131] The technical solutions of the embodiments of the present application can be applied to various communication systems, for example: global system of mobile communication (GSM) system, code division multiple access (CDMA) system, wideband code division multiple access (WCDMA) system, general packet radio service (GPRS), long term evolution (LTE) system, LTE frequency division duplex (FDD) system, LTE time division duplex (TDD), universal mobile telecommunication system (UMTS), worldwide interoperability for microwave access (WiMAX) communication system, fifth generation (5G) system or new radio (NR) and future communication systems, etc.

[0132] Figure 1 1 is a schematic diagram of the architecture of a communication system provided in an embodiment of the present application, and the solution in the present application can be applied to the communication system. The communication system can include UEX and a UE group, and the UE group includes UE1, UE2 and UE3. Figure 1 Take the case where the UE group includes 3 UEs as an example. Of course, the number of UEs in the UE group may also be 2 or more than 3, which is not limited in the embodiment of the present application.

[0133] Among them, UE includes a device that provides voice and / or data connectivity to users. For example, UE is a device with wireless transceiver function, which can be deployed on land, including indoors or outdoors, handheld, wearable or vehicle-mounted; it can also be deployed on the water surface (such as ships, etc.); it can also be deployed in the air (such as airplanes, balloons and satellites, etc.). The UE can be a mobile phone, a tablet computer (Pad), a computer with wireless transceiver function, a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a wireless terminal in industrial control, a vehicle-mounted terminal device, a wireless terminal in unmanned driving (self driving), a vehicle, a roadside device, an aircraft, a wireless terminal in remote medical, a wireless terminal in smart grid, a wireless terminal in transportation safety, a wireless terminal in smart city, a wireless terminal in smart home, a wearable terminal device, etc. The embodiments of the present application do not limit the application scenarios. UE may also be sometimes referred to as terminal equipment, terminal, access terminal equipment, vehicle-mounted terminal, industrial control terminal, UE unit, UE station, mobile station, mobile station, remote station, remote terminal equipment, mobile device, UE terminal equipment, wireless communication equipment, UE agent or UE device, etc. UE may also be fixed or mobile. In the embodiment of the present application, the device for implementing the function of UE may be UE, or may be a device that can support UE to implement the function, such as a chip system or a combination device or component that can implement the UE function, and the device may be installed in UE.

[0134] In the embodiment of the present application, UEX can communicate directly with other UEs (such as UE1, UE2 and UE3), and the link between UEs is called a side link (SL). Figure 1 UEX and UE1 can communicate directly through SL. UEX and UE2 can communicate directly through SL. UEX and UE3 can communicate directly through SL.

[0135] There are two transmission modes or resource allocation modes on SL, namely: mode 1 and mode 2. In mode 1, the access network device allocates resources to the sending UE in a centralized manner. The sending UE directly uses the resources allocated by the access network device to send data to the receiving UE. The access network device allocates resources through downlink control signaling.

[0136] Mode 2 resource allocation is that the sending UE autonomously selects available resources from the resource pool for data transmission through perception. The selected resources can be used only once, or can be used for a period of time or a certain number of times. Usually, the sending UE is configured with multiple resource pools, and different resource pools may have different configurations to meet the needs of different services of the sending UE. The sending UE selects a resource pool that meets the service requirements from multiple resource pools. When there are still multiple resource pools after the selection, the sending UE can randomly select a resource pool from them for data transmission.

[0137] In the embodiment of the present application, the UEX can multicast the PSSCH to the UE group. The UEs in the UE group support SL HARQ feedback. The HARQ feedback information of a PSSCH is carried by the PSFCH. The UEs in the UE group have the following two SL HARQ feedback options:

[0138] Option 1: If decoding fails after decoding PSCCH, the receiving UE transmits HARQ-NACK, and does not transmit signals in other cases. Supports all receiving UEs in the UE group to share the same PSFCH resource.

[0139] Option 2: If decoding is successful, the receiving UE transmits HARQ-ACK, and if decoding fails, the receiving UE transmits HARQ-NACK. Each UE in the UE group is supported to use a separate PSFCH resource.

[0140] SL-U is an important topic discussed in the R18 standard, and its main content is SL transmission in unlicensed spectrum. During the SL-U discussion, some companies have been opposed to Option 1 for multicast, and it is possible that SL-U will not support Option 1 for multicast in the future. Only Option 2 that supports multicast may lead to insufficient PSFCH feedback resources. When PSFCH feedback resources are insufficient, how to reasonably handle HARQ feedback is a technical problem that needs to be solved urgently. To this end, the present application provides an information feedback method and a communication device, which can reasonably handle HARQ feedback when PSFCH feedback resources are insufficient.

[0141] The information feedback method and communication device are further introduced below in conjunction with the accompanying drawings. It can be understood that the present application uses the first UE and the second UE as an example of the execution subject of the interaction diagram, but the present application does not limit the execution subject of the interaction diagram. For example, the first UE in the method provided by the present application may also be a chip, a chip system, or a processor applied to the first UE, and may also be a logical node, a logical module or software that can implement all or part of the first UE; the second UE in the method provided by the present application may also be a chip, a chip system, or a processor applied to the second UE, and may also be a logical node, a logical module or software that can implement all or part of the second UE.

[0142] See also Figure 2 , Figure 2 A flow chart of an information feedback method provided in an embodiment of the present application.

[0143] 201. The second UE multicasts a first PSSCH to a UE group. Correspondingly, the first UE receives the first PSSCH multicast by the second UE to the UE group. The first UE is one of the UE group, and the UE group includes multiple UEs.

[0144] For example, the second UE may be Figure 1 UEX in the UE group includes Figure 1 UE1, UE2 and UE3. The first UE may be Figure 1 UE1 or UE2 or UE3 in the UE group, that is, the first UE can be any one of the UE group. The execution principle of any UE in the UE group is the same, so the embodiment of the present application takes one UE in the UE group as an example to illustrate the execution principle of all UEs in the UE group.

[0145] 202. When the first parameter is greater than the number of PSFCH candidate resources, the first UE does not transmit HARQ feedback information corresponding to the first PSSCH to the second UE, or the first UE transmits only the common part on the PSFCH corresponding to the first PSSCH. The first parameter is obtained according to the member identifier of the first UE or the number of UEs included in the UE group or the arrangement sequence number of the first UE in the UE group.

[0146] In the embodiment of the present application, the first UE transmits only the common part on the PSFCH corresponding to the first PSSCH, indicating that the first UE does not transmit the HARQ feedback information corresponding to the first PSSCH. The common part is a signal sent by the UE in SL-U to occupy the channel so as not to be occupied by other UEs or WiFi. The common part occupies one comb tooth, that is, there is a PRB carrying the signal every N PRBs. N is a positive integer, for example, N can be 5, 10, etc.

[0147] In an embodiment of the present application, when the first parameter is greater than the number of PSFCH candidate resources, it indicates that the PSFCH candidate resources are insufficient, and therefore the first UE does not transmit the HARQ feedback information corresponding to the first PSSCH to the second UE, or the first UE only transmits the common part on the PSFCH corresponding to the first PSSCH, thereby avoiding the first UE occupying the PSFCH candidate resources.

[0148] In an embodiment of the present application, the member identifier of the first UE refers to the member identifier (memberID) of the first UE in the UE group. Optionally, the member identifier of the first UE may be a random value. For example, the UE group includes UE1, UE2 and UE3, the member identifier of UE1 is 3, the member identifier of UE2 is 8, and the member identifier of UE3 is 5. Alternatively, the member identifier of the first UE may be a non-random value generated in sequence. For example, the member identifier of the UE may also take 0 as the starting value. The member identifier of UE1 may be 0, the member identifier of UE2 may be 1, and the member identifier of UE3 may be 2. Optionally, the member identifier of the UE may also take 1 or a value greater than 1 as the starting value, which is not limited in the embodiment of the present application.

[0149] Optionally, the arrangement sequence number of the UE in the UE group may be an arrangement sequence number obtained by arranging the UEs from large to small according to their member identifiers. For example, if the member identifier of UE1 is 3, the member identifier of UE2 is 8, and the member identifier of UE3 is 5, then the arrangement sequence number of UE2 in the UE group is 1, the arrangement sequence number of UE3 in the UE group is 2, and the arrangement sequence number of UE1 in the UE group is 3. Alternatively, the arrangement sequence number of the UE in the UE group may be obtained by arranging the UEs in other orders, which is not limited in the embodiments of the present application.

[0150] In a possible embodiment, the first parameter is a member identifier of the first UE or the number of UEs included in the UE group (groupsize) or an arrangement sequence number of the first UE in the UE group.

[0151] For example, the first parameter is a member ID of the first UE. The member IDs are 1, 2, 3, 4, 5, and 6. At this time, the groupsize is 6, and the number of PSFCH candidate resources is 4. Then, the UEs with member IDs 5 and 6 belong to the UEs whose first parameter is greater than the number of PSFCH candidate resources. Figure 3 to Figure 8 The corresponding embodiments are the same and will not be described in detail below.

[0152] For another example, the member IDs are arranged from front to back as 01, 03, 05, 08, 02, and 04, respectively. At this time, the groupsize is 6, and the number of PSFCH resources to be selected is 4. If the first parameter is the member identifier of the first UE, the UEs with member ID values ​​of 05 and 08 belong to the UEs whose first parameter is greater than the number of PSFCH resources to be selected. If the first parameter is the arrangement sequence of the first UE in the UE group, the UEs with member ID values ​​of 02 and 04 belong to the UEs whose first parameter is greater than the number of PSFCH resources to be selected, that is, the number position is greater than the number of resources. Figure 3 to Figure 8 The corresponding embodiments are the same and will not be described in detail below.

[0153] In another possible embodiment, the first parameter may be the member identifier of the first UE+1, or the first parameter may be the member identifier of the first UE-1. For example, if the starting value of the member identifier of the UE starts with 0, the first parameter may be the member identifier of the first UE+1. If the starting value of the member identifier of the UE starts with 2, the first parameter may be the member identifier of the first UE-1.

[0154] In another possible embodiment, the first parameter may be the number of UEs included in the UE group minus 1. For example, if the UE group includes the second UE, the number of UEs included in the UE group may be minus 1.

[0155] In another possible embodiment, the first parameter may be the arrangement sequence number of the first UE in the UE group + 1, or the first parameter may be the arrangement sequence number of the first UE in the UE group - 1. For example, if the starting value of the arrangement sequence number of the UE in the UE group starts with 0, the first parameter may be the arrangement sequence number of the first UE in the UE group + 1. If the starting value of the arrangement sequence number of the UE in the UE group starts with 2, the first parameter may be the arrangement sequence number of the first UE in the UE group - 1.

[0156] In a possible embodiment, step 202 and step 203 may also be performed when the first parameter is greater than or equal to the number of PSFCH resources to be selected. In this case, the value range of the first parameter starts from zero. For example, take the first parameter as the member identifier of the first UE. The member ID is 0, 1, 2, 3, 4, 5, and the groupsize is 6, and the number of PSFCH resources to be selected is 4. Then, the UEs with member IDs 4 and 5 belong to the UEs with member IDs greater than or equal to the PSFCH resources to be selected. Figure 3 to Figure 8 The corresponding embodiments are the same and will not be described in detail below.

[0157] In an embodiment of the present application, "the first UE does not transmit the HARQ feedback information corresponding to the first PSSCH to the second UE" means that the first UE does not send the HARQ feedback information corresponding to the first PSSCH, or the first UE does not send any signal on the corresponding PSFCH resource, or the first UE remains idle (absent) on the corresponding PSFCH resource, or the first UE does not enable HARQ feedback on the corresponding PSFCH resource. Figure 3 to Figure 6 The corresponding embodiments are the same and will not be described in detail below.

[0158] In a resource pool, PSFCH resources appear in a period of M slots, and the value of M is currently 1, 2, and 4. For a PSSCH that appears in slot n, the corresponding PSFCH resource appears in slot n+a, where a is the smallest integer greater than or equal to K that satisfies the PSFCH resource period. The value of K is indicated by the resource pool configuration parameter sl-MinTimeGapPSFCH, which is generally 2 or 3 time slots. When PSFCH resources appear in a period of M, there will be M PSSCHs corresponding to the PSFCH that need to share a PSFCH resource.

[0159] 203. When the first parameter is greater than the number of PSFCH selected resources, the second UE does not detect the HARQ feedback information corresponding to the first PSSCH from the first UE, or the second UE receives only the common part transmitted by the first UE on the PSFCH corresponding to the first PSSCH.

[0160] In the embodiment of the present application, the second UE does not detect the HARQ feedback information corresponding to the first PSSCH from the first UE, indicating that the second UE does not need to receive the HARQ feedback information corresponding to the first PSSCH from the first UE. The second UE receives the common part transmitted only by the first UE on the PSFCH corresponding to the first PSSCH, indicating that the second UE does not detect the HARQ feedback information corresponding to the first PSSCH from the first UE.

[0161] When the first parameter is greater than the number of PSFCH candidate resources, it indicates that the PSFCH candidate resources are insufficient, and the first UE does not transmit the HARQ feedback information corresponding to the first PSSCH to the second UE, or the first UE transmits only the common part on the PSFCH corresponding to the first PSSCH. Therefore, the second UE may not detect the HARQ feedback information corresponding to the first PSSCH from the first UE, or the second UE receives only the common part transmitted by the first UE on the PSFCH corresponding to the first PSSCH.

[0162] In a possible embodiment, when the first parameter is less than or equal to the number of PSFCH candidate resources, the first UE determines the PSFCH resource corresponding to the first UE from the PSFCH candidate resources based on the member identifier of the first UE; the first UE sends a first PSFCH to the second UE on the PSFCH resource corresponding to the first UE, and the first PSFCH carries HARQ feedback information corresponding to the first PSSCH. Optionally, the HARQ feedback information may be HARQ-ACK information or HARQ-NACK information.

[0163] Accordingly, when the first parameter is less than or equal to the number of PSFCH selected resources, the second UE determines the PSFCH resources corresponding to the first UE from the PSFCH selected resources based on the member identifier of the first UE; the second UE receives the first PSFCH sent by the first UE on the PSFCH resources corresponding to the first UE.

[0164] That is to say, when there are sufficient PSFCH candidate resources, the first UE can normally perform HARQ feedback in the manner of Option 2. Optionally, when the first UE determines the PSFCH resources corresponding to the first UE from the PSFCH candidate resources based on the member identifier of the first UE, the first UE can directly bring the first member identifier of the first UE into the existing resource determination algorithm of SL HARQ feedback Option 2 to determine the PSFCH resources corresponding to the first UE.

[0165] For example, take the case where the first parameter is the member identifier of the first UE. The second UE is UEX, the UE group includes UE1, UE2 and UE3, the member identifier of UE1 is 1, the member identifier of UE2 is 2, and the member identifier of UE3 is 3. Assume that the number of PSFCH candidate resources is 2. Since the member identifier of UE1 is less than the number of PSFCH candidate resources, UE1 determines the PSFCH resource corresponding to UE1 from the PSFCH candidate resources, and then transmits the HARQ feedback information corresponding to the first PSSCH to UEX on the PSFCH resource. Correspondingly, UEX can also determine the PSFCH resource corresponding to UE1 from the PSFCH candidate resources, and receive the HARQ feedback information corresponding to the first PSSCH sent by UE1 on the PSFCH resource.

[0166] Since the member identifier of UE2 is equal to the number of PSFCH candidate resources, UE2 determines the PSFCH resource corresponding to UE2 from the PSFCH candidate resources, and then transmits the HARQ feedback information corresponding to the first PSSCH to UEX on the PSFCH resource. Correspondingly, UEX can also determine the PSFCH resource corresponding to UE2 from the PSFCH candidate resources, and receive the HARQ feedback information corresponding to the first PSSCH sent by UE2 on the PSFCH resource.

[0167] Since the member identifier of UE3 is greater than the number of PSFCH candidate resources, UE3 does not transmit the HARQ feedback information corresponding to the first PSSCH to UEX, or UE3 transmits only the common part on the PSFCH corresponding to the first PSSCH. Accordingly, UEX does not detect the HARQ feedback information corresponding to the first PSSCH from UE3, or UEX receives the common part transmitted only by UE3 on the PSFCH corresponding to the first PSSCH.

[0168] The same is true when the first parameter is obtained based on the number of UEs included in the UE group or the arrangement sequence number of the first UE in the UE group, and no further examples are given here.

[0169] In a possible embodiment, the second UE multicasts the first PSSCH to the UE group in a shared spectrum or an unlicense spectrum. Accordingly, the first UE receives the first PSSCH multicast by the second UE to the UE group in the shared spectrum or the unlicense spectrum. That is, the sidelink transmission between the first UE and the UEs in the UE group is located on the unlicense spectrum. Figure 3 to Figure 8 The corresponding embodiments are the same and will not be described in detail below.

[0170] That is to say, in the embodiments of the present application:

[0171] If group size is greater than the number of candidate PSFCH resources associated with this sidelink grant, the UE does not transmit PSFCH conveyingHARQ information.And / Or,

[0172] if member ID associated with a UE is greater than the number ofcandidate PSFCH resources associated with this sidelink grant, the UE does nottransmit PSFCH conveying HARQ information.And / Or,

[0173] if index of member ID associated with a UE is greater than the number of candidate PSFCH resources associated with this sidelink grant, the UE does not transmit PSFCH conveying HARQ information.

[0174] It can be seen that based on Figure 2 According to the described method, the first UE can not send HARQ feedback information corresponding to the first PSSCH when the number of PSFCH candidate resources is insufficient, thereby avoiding the situation where multiple UEs occupy one PSFCH candidate resource, and making the second UE more distinguishable from the situation where the UE in the UE group receives the first PSSCH. Figure 2 The described method can properly handle HARQ feedback when the number of PSFCH candidate resources is insufficient.

[0175] See also Figure 3 , Figure 3 A flow chart of an information feedback method provided in an embodiment of the present application.

[0176] 301. The second UE multicasts a first PSSCH to a UE group, the first PSSCH carrying indication information, the indication information indicating enabling HARQ feedback. Accordingly, the first UE receives the first PSSCH multicast by the second UE to the UE group. The first UE is one of the UE group, and the UE group includes multiple UEs.

[0177] Optionally, the indication information may be included in second-level sidelink control information, and the second-level sidelink control information is carried on the first PSSCH.

[0178] 302. When the first parameter is greater than the number of PSFCH selected resources, the first UE does not transmit the HARQ feedback information corresponding to the first PSSCH to the second UE, or the first UE only transmits the common part on the PSFCH corresponding to the first PSSCH.

[0179] The first parameter is obtained according to the member identifier of the first UE or the number of UEs included in the UE group or the arrangement number of the first UE in the UE group. For how to obtain the first parameter according to the member identifier of the first UE or the number of UEs included in the UE group or the arrangement number of the first UE in the UE group, please refer to Figure 2 The introduction in the corresponding embodiments will not be repeated here.

[0180] In an embodiment of the present application, when HARQ feedback is enabled, after the first UE receives the first PSSCH, the first UE may compare the first parameter with the number of PSFCH candidate resources. If the first parameter is greater than the number of PSFCH candidate resources, the first UE does not transmit the HARQ feedback information corresponding to the first PSSCH to the second UE, or the first UE transmits only the common part on the PSFCH corresponding to the first PSSCH.

[0181] In a possible embodiment, when the first parameter is greater than the number of PSFCH candidate resources, the first UE may determine not to enable HARQ feedback. After the first UE determines not to enable HARQ feedback, the first UE does not transmit HARQ feedback information corresponding to the first PSSCH to the second UE, or the first UE transmits only the common part on the PSFCH corresponding to the first PSSCH.

[0182] 303. When the first parameter is greater than the number of PSFCH selected resources, the second UE does not detect the HARQ feedback information corresponding to the first PSSCH from the first UE, or the second UE receives only the common part transmitted by the first UE on the PSFCH corresponding to the first PSSCH.

[0183] In an embodiment of the present application, when HARQ feedback is enabled, after the second UE multicasts the first PSSCH, the second UE can compare the first parameter with the number of PSFCH candidate resources. If the first parameter is greater than the number of PSFCH candidate resources, the second UE does not detect the HARQ feedback information corresponding to the first PSSCH from the first UE, or the second UE receives only the common part transmitted by the first UE on the PSFCH corresponding to the first PSSCH.

[0184] In a possible embodiment, when the first parameter is less than or equal to the number of PSFCH candidate resources, the first UE determines the PSFCH resource corresponding to the first UE from the PSFCH candidate resources based on the member identifier of the first UE; the first UE sends a first PSFCH to the second UE on the PSFCH resource corresponding to the first UE, and the first PSFCH carries HARQ feedback information corresponding to the first PSSCH. Optionally, the HARQ feedback information may be HARQ-ACK information or HARQ-NACK information.

[0185] Accordingly, when the first parameter is less than or equal to the number of PSFCH selected resources, the second UE determines the PSFCH resources corresponding to the first UE from the PSFCH selected resources based on the member identifier of the first UE; the second UE receives the first PSFCH sent by the first UE on the PSFCH resources corresponding to the first UE.

[0186] That is to say, when there are sufficient PSFCH resources to be selected, the first UE can normally use Option 2 to perform HARQ feedback.

[0187] In a possible embodiment, when the first parameter is less than or equal to the number of PSFCH candidate resources, the first UE may determine to enable HARQ feedback. After the first UE determines to enable HARQ feedback, the PSFCH resource corresponding to the first UE is determined from the PSFCH candidate resources based on the member identifier of the first UE, and then the first PSFCH is sent to the second UE on the PSFCH resource corresponding to the first UE.

[0188] In a possible embodiment, the first parameter is obtained according to the number of UEs included in the UE group; when the first parameter is greater than the number of PSFCH selectable resources, the second UE does not receive feedback, that is, no one provides feedback at this time.

[0189] In another possible embodiment, the first parameter is obtained according to the member identifier of the first UE or the arrangement sequence number of the first UE in the UE group; when the first parameter is greater than the number of PSFCH selected resources, the second UE does not expect those first UEs whose corresponding first parameters are greater than the number of PSFCH selected resources to send feedback.

[0190] It can be seen that based on Figure 3 The described method, even if HARQ feedback is enabled, the first UE can not send HARQ feedback information corresponding to the first PSSCH when the number of PSFCH candidate resources is insufficient, thereby avoiding the situation where multiple UEs occupy one PSFCH candidate resource, and making the second UE more distinguishable from the situation where the UE in the UE group receives the first PSSCH. Figure 3 The described method can properly handle HARQ feedback when the number of PSFCH candidate resources is insufficient.

[0191] See also Figure 4 , Figure 4 A flow chart of an information feedback method provided in an embodiment of the present application.

[0192] 401. The second UE multicasts a first PSSCH to a UE group, the first PSSCH carrying indication information, the indication information indicating enabling HARQ feedback. Accordingly, the first UE receives the first PSSCH multicast by the second UE to the UE group. The first UE is one of the UE group, and the UE group includes multiple UEs.

[0193] Optionally, the indication information may be included in second-level sidelink control information, and the second-level sidelink control information is carried on the first PSSCH.

[0194] 402. When the first parameter is greater than the number of PSFCH resources to be selected, and the member identifier of the first UE or the arrangement number of the first UE in the UE group is greater than the number of PSFCH resources to be selected, the first UE does not transmit the HARQ feedback information corresponding to the first PSSCH to the second UE, or the first UE only transmits the common part on the PSFCH corresponding to the first PSSCH.

[0195] The first parameter is obtained according to the number of UEs included in the UE group. For details on how to obtain the first parameter according to the number of UEs included in the UE group, see Figure 2 The introduction in the corresponding embodiments will not be repeated here.

[0196] In an embodiment of the present application, when HARQ feedback is enabled, after the first UE receives the first PSSCH, the first UE may compare the first parameter with the number of PSFCH resources to be selected. If the first parameter is greater than the number of PSFCH resources to be selected, the first UE continues to compare the member identifier of the first UE or the arrangement number of the first UE in the UE group with the number of PSFCH resources to be selected. If the member identifier of the first UE or the arrangement number of the first UE in the UE group is greater than the number of PSFCH resources to be selected, the first UE does not transmit the HARQ feedback information corresponding to the first PSSCH to the second UE, or the first UE transmits only the common part on the PSFCH corresponding to the first PSSCH.

[0197] In a possible embodiment, when the first parameter is greater than the number of PSFCH candidate resources, and the member identifier of the first UE or the arrangement number of the first UE in the UE group is greater than the number of PSFCH candidate resources, the first UE determines not to enable HARQ feedback. After the first UE determines not to enable HARQ feedback, the first UE does not transmit HARQ feedback information corresponding to the first PSSCH to the second UE, or the first UE transmits only the common part on the PSFCH corresponding to the first PSSCH.

[0198] 403. When the first parameter is greater than the number of PSFCH resources to be selected, and the member identifier of the first UE or the arrangement number of the first UE in the UE group is greater than the number of PSFCH resources to be selected, the second UE does not detect the HARQ feedback information corresponding to the first PSSCH from the first UE, or the second UE receives the common part transmitted only by the first UE on the PSFCH corresponding to the first PSSCH.

[0199] In an embodiment of the present application, when HARQ feedback is enabled, after the second UE multicasts the first PSSCH, the second UE can compare the first parameter with the number of PSFCH resources to be selected. If the first parameter is greater than the number of PSFCH resources to be selected, the second UE continues to compare the member identifier of the first UE or the arrangement number of the first UE in the UE group with the number of PSFCH resources to be selected. If the member identifier of the first UE or the arrangement number of the first UE in the UE group is greater than the number of PSFCH resources to be selected, the second UE does not detect the HARQ feedback information corresponding to the first PSSCH from the first UE, or the second UE receives the common part transmitted only by the first UE on the PSFCH corresponding to the first PSSCH.

[0200] In a possible embodiment, when the first parameter is greater than the number of PSFCH candidate resources, and the member identifier of the first UE or the arrangement number of the first UE in the UE group is less than or equal to the number of PSFCH candidate resources, the first UE determines the PSFCH resource corresponding to the first UE from the PSFCH candidate resources based on the member identifier of the first UE; the first UE sends a first PSFCH to the second UE on the PSFCH resource corresponding to the first UE, and the first PSFCH carries the HARQ feedback information corresponding to the first PSSCH. Optionally, the HARQ feedback information can be HARQ-ACK information or HARQ-NACK information.

[0201] Accordingly, when the first parameter is greater than the number of PSFCH resources for selection, and the member identifier of the first UE or the arrangement number of the first UE in the UE group is less than or equal to the number of PSFCH resources for selection, the second UE determines the PSFCH resources corresponding to the first UE from the PSFCH resources for selection based on the member identifier of the first UE; the second UE receives the first PSFCH sent by the first UE on the PSFCH resources corresponding to the first UE.

[0202] That is to say, although the first parameter is greater than the number of PSFCH candidate resources, when the member identifier of the first UE or the arrangement number of the first UE in the UE group is less than or equal to the number of PSFCH candidate resources, the first UE can normally perform HARQ feedback in Option 2. Based on this possible implementation, when the number of UEs included in the UE group is greater than the number of PSFCH candidate resources, some UEs can perform HARQ feedback normally, so that the second UE can determine the reception status of these UEs on the first PSSCH.

[0203] For example, the first parameter is the number of UEs included in the UE group. The second UE is UEX, and the UE group includes UE1, UE2 and UE3. The member identifier of UE1 is 1, the member identifier of UE2 is 2, and the member identifier of UE3 is 3. Assume that the number of PSFCH resources to be selected is 2. Since the number of UEs included in the UE group is greater than the number of PSFCH resources to be selected, UE1 continues to compare the size of the member identifier of UE1 and the number of PSFCH resources to be selected. Since the member identifier of UE1 is less than the number of PSFCH resources to be selected, UE1 determines the PSFCH resource corresponding to UE1 from the PSFCH resources to be selected, and then transmits the HARQ feedback information corresponding to the first PSSCH to UEX on the PSFCH resource. Correspondingly, based on the same principle, UEX can also determine the PSFCH resource corresponding to UE1 from the PSFCH resources to be selected, and receive the HARQ feedback information corresponding to the first PSSCH sent by UE1 on the PSFCH resource.

[0204] Since the number of UEs included in the UE group is greater than the number of PSFCH candidate resources, UE2 continues to compare the size of UE1's member identifier and the number of PSFCH candidate resources. Since UE2's member identifier is equal to the number of PSFCH candidate resources, UE2 determines the PSFCH resource corresponding to UE2 from the PSFCH candidate resources, and then transmits the HARQ feedback information corresponding to the first PSSCH to UEX on the PSFCH resource. Correspondingly, UEX can also determine the PSFCH resource corresponding to UE2 from the PSFCH candidate resources based on the same principle, and receive the HARQ feedback information corresponding to the first PSSCH sent by UE2 on the PSFCH resource.

[0205] Since the number of UEs included in the UE group is greater than the number of PSFCH resources to be selected, UE3 continues to compare the size of UE1's member identifier and the number of PSFCH resources to be selected. Since UE3's member identifier is greater than the number of PSFCH resources to be selected, UE3 does not transmit the HARQ feedback information corresponding to the first PSSCH to UEX, or UE3 only transmits the common part on the PSFCH corresponding to the first PSSCH. Correspondingly, based on the same principle, UEX does not detect the HARQ feedback information corresponding to the first PSSCH from UE3, or UEX receives the common part transmitted only by UE3 on the PSFCH corresponding to the first PSSCH.

[0206] In a possible embodiment, when the first parameter is greater than the number of PSFCH candidate resources, and the member identifier of the first UE or the arrangement number of the first UE in the UE group is less than or equal to the number of PSFCH candidate resources, the first UE determines to enable HARQ feedback. After the first UE determines to enable HARQ feedback, the PSFCH resource corresponding to the first UE is determined from the PSFCH candidate resources based on the member identifier of the first UE, and then the first PSFCH is sent to the second UE on the PSFCH resource corresponding to the first UE.

[0207] In a possible embodiment, when the first parameter is less than or equal to the number of PSFCH candidate resources, the first UE determines the PSFCH resource corresponding to the first UE from the PSFCH candidate resources based on the member identifier of the first UE; the first UE sends a first PSFCH to the second UE on the PSFCH resource corresponding to the first UE, and the first PSFCH carries HARQ feedback information corresponding to the first PSSCH. Optionally, the HARQ feedback information may be HARQ-ACK information or HARQ-NACK information.

[0208] Accordingly, when the first parameter is less than or equal to the number of PSFCH selected resources, the second UE determines the PSFCH resources corresponding to the first UE from the PSFCH selected resources based on the member identifier of the first UE; the second UE receives the first PSFCH sent by the first UE on the PSFCH resources corresponding to the first UE.

[0209] In a possible embodiment, when the first parameter is less than or equal to the number of PSFCH candidate resources, the first UE may determine to enable HARQ feedback. After the first UE determines to enable HARQ feedback, the PSFCH resource corresponding to the first UE is determined from the PSFCH candidate resources based on the member identifier of the first UE, and then the first PSFCH is sent to the second UE on the PSFCH resource corresponding to the first UE.

[0210] It can be seen that based on Figure 4 The described method, even if HARQ feedback is enabled, the first UE can not send HARQ feedback information corresponding to the first PSSCH when the number of UEs included in the UE group is greater than the number of PSFCH candidate resources, and the member identifier of the first UE or the arrangement sequence number of the first UE in the UE group is greater than the number of PSFCH candidate resources, thereby avoiding the situation where multiple UEs occupy one PSFCH candidate resource, and making the second UE more distinguishable about the situation where the UE in the UE group receives the first PSSCH. Figure 4 The described method can properly handle HARQ feedback when the number of PSFCH candidate resources is insufficient.

[0211] See also Figure 5, Figure 5 A flow chart of an information feedback method provided in an embodiment of the present application.

[0212] 501. The second UE multicasts a first PSSCH to a UE group. The first PSSCH carries indication information. When the first parameter is greater than the number of PSFCH candidate resources, the indication information indicates that HARQ feedback is not enabled. Accordingly, the first UE receives the first PSSCH multicast by the second UE to the UE group. The first UE is one of the UE group, and the UE group includes multiple UEs.

[0213] The first parameter is obtained according to the number of UEs included in the UE group. For details on how to obtain the first parameter according to the number of UEs included in the UE group, see Figure 2 The introduction in the corresponding embodiments will not be repeated here.

[0214] Optionally, the indication information may be included in second-level sidelink control information, and the second-level sidelink control information is carried on the first PSSCH.

[0215] That is, the second UE may compare the first parameter with the number of PSFCH candidate resources. If the first parameter is greater than the number of PSFCH candidate resources, the second UE determines not to enable HARQ feedback. The second UE generates indication information for indicating not to enable HARQ feedback.

[0216] In a possible embodiment, when the first parameter is less than or equal to the number of PSFCH candidate resources, the indication information indicates enabling HARQ feedback.

[0217] 502. When the first parameter is greater than the number of PSFCH selected resources, the first UE does not transmit the HARQ feedback information corresponding to the first PSSCH to the second UE, or the first UE only transmits the common part on the PSFCH corresponding to the first PSSCH.

[0218] That is, if the indication information indicates that HARQ feedback is not enabled, the first UE does not transmit HARQ feedback information corresponding to the first PSSCH to the second UE, or the first UE only transmits the common part on the PSFCH corresponding to the first PSSCH.

[0219] 503. When the first parameter is greater than the number of PSFCH selected resources, the second UE does not detect the HARQ feedback information corresponding to the first PSSCH from the first UE, or the second UE receives only the common part transmitted by the first UE on the PSFCH corresponding to the first PSSCH.

[0220] That is, if the indication information indicates that HARQ feedback is not enabled, the second UE does not detect the HARQ feedback information corresponding to the first PSSCH from the first UE, or the second UE receives only the common part transmitted by the first UE on the PSFCH corresponding to the first PSSCH.

[0221] For example, the first parameter is the number of UEs included in the UE group. The second UE is UEX, the UE group includes UE1, UE2 and UE3, the member identifier of UE1 is 1, the member identifier of UE2 is 2, and the member identifier of UE3 is 3. Assume that the number of PSFCH resources to be selected is 2. UEX compares the number of UEs included in the UE group with the number of PSFCH resources to be selected. Since the number of UEs included in the UE group is greater than the number of PSFCH resources to be selected, UEX multicasts the first PSSCH to the UE group, and the first PSSCH carries indication information, which indicates that HARQ feedback is not enabled.

[0222] After UE1 receives the first PSSCH, since the indication information indicates that HARQ feedback is not enabled, UE1 does not transmit the HARQ feedback information corresponding to the first PSSCH to UEX, or UE1 transmits only the common part on the PSFCH corresponding to the first PSSCH. Correspondingly, based on the same principle, UEX does not detect the HARQ feedback information corresponding to the first PSSCH from UE1, or UEX receives the common part transmitted only by UE1 on the PSFCH corresponding to the first PSSCH.

[0223] After UE2 receives the first PSSCH, since the indication information indicates that HARQ feedback is not enabled, UE2 does not transmit the HARQ feedback information corresponding to the first PSSCH to UEX, or UE2 transmits only the common part on the PSFCH corresponding to the first PSSCH. Accordingly, based on the same principle, UEX does not detect the HARQ feedback information corresponding to the first PSSCH from UE2, or UEX receives the common part transmitted only by UE2 on the PSFCH corresponding to the first PSSCH.

[0224] After UE3 receives the first PSSCH, since the indication information indicates that HARQ feedback is not enabled, UE3 does not transmit the HARQ feedback information corresponding to the first PSSCH to UEX, or UE3 transmits only the common part on the PSFCH corresponding to the first PSSCH. Correspondingly, based on the same principle, UEX does not detect the HARQ feedback information corresponding to the first PSSCH from UE3, or UEX receives the common part transmitted only by UE3 on the PSFCH corresponding to the first PSSCH.

[0225] That is to say, in the embodiments of the present application:

[0226] For shared spectrum, ifa group size provided by upper layers and the group size is greater than the number of candidate PSFCH resources associated with this sidelink grant: set HARQ feedback disable.And / Or,

[0227] ifHARQ feedback is enabled for groupcast: For shared spectrum, select positive-negative acknowledgment for those member ID not greater than the number of candidate PSFCH resources associated with this sidelink grant.

[0228] It can be seen that based on Figure 5 According to the described method, the second UE can indicate not to enable HARQ feedback when the number of UEs included in the UE group is greater than the number of PSFCH candidate resources, thereby avoiding the situation where multiple UEs occupy one PSFCH candidate resource, and making the second UE more distinguishable from the situation where the UEs in the UE group receive the first PSSCH. Figure 5 The described method can properly handle HARQ feedback when the number of PSFCH candidate resources is insufficient.

[0229] See also Figure 6 , Figure 6 A flow chart of an information feedback method provided in an embodiment of the present application.

[0230] 601. The second UE multicasts a first PSSCH to a UE group. The first PSSCH carries indication information. When a first parameter is greater than the number of PSFCH candidate resources, the indication information indicates that HARQ feedback is not enabled. Accordingly, the first UE receives the first PSSCH multicast by the second UE to the UE group. The first UE is one of the UE group, and the UE group includes multiple UEs.

[0231] The first parameter is obtained according to the number of UEs included in the UE group. For details on how to obtain the first parameter according to the number of UEs included in the UE group, see Figure 2 The introduction in the corresponding embodiments will not be repeated here.

[0232] Optionally, the indication information may be included in second-level sidelink control information, and the second-level sidelink control information is carried on the first PSSCH.

[0233] That is, the second UE may compare the first parameter with the number of PSFCH candidate resources. If the first parameter is greater than the number of PSFCH candidate resources, the second UE determines not to enable HARQ feedback. The second UE generates indication information for indicating not to enable HARQ feedback.

[0234] In a possible embodiment, when the first parameter is less than or equal to the number of PSFCH candidate resources, the indication information indicates enabling HARQ feedback.

[0235] 602. When the first parameter is greater than the number of PSFCH resources to be selected, and the member identifier of the first UE or the arrangement number of the first UE in the UE group is greater than the number of PSFCH resources to be selected, the first UE does not transmit the HARQ feedback information corresponding to the first PSSCH to the second UE, or the first UE only transmits the common part on the PSFCH corresponding to the first PSSCH.

[0236] That is to say, even if the indication information indicates that HARQ feedback is not enabled, the first UE still needs to continue to compare whether the member identifier of the first UE or the arrangement number of the first UE in the UE group is greater than the number of PSFCH resources to be selected. If the member identifier of the first UE or the arrangement number of the first UE in the UE group is greater than the number of PSFCH resources to be selected, the first UE does not transmit the HARQ feedback information corresponding to the first PSSCH to the second UE, or the first UE only transmits the common part on the PSFCH corresponding to the first PSSCH.

[0237] In a possible embodiment, even if the indication information indicates that HARQ feedback is not enabled, the first UE still needs to continue to compare whether the member identifier of the first UE or the arrangement number of the first UE in the UE group is greater than the number of PSFCH resources to be selected. If the member identifier of the first UE or the arrangement number of the first UE in the UE group is greater than the number of PSFCH resources to be selected, the first UE determines not to enable HARQ feedback. After the first UE determines not to enable HARQ feedback, the first UE does not transmit the HARQ feedback information corresponding to the first PSSCH to the second UE, or the first UE only transmits the common part on the PSFCH corresponding to the first PSSCH.

[0238] 603. When the first parameter is greater than the number of PSFCH resources to be selected, and the member identifier of the first UE or the arrangement number of the first UE in the UE group is greater than the number of PSFCH resources to be selected, the second UE does not detect the HARQ feedback information corresponding to the first PSSCH from the first UE, or the second UE receives the common part transmitted only by the first UE on the PSFCH corresponding to the first PSSCH.

[0239] That is to say, even if the indication information indicates that HARQ feedback is not enabled, the second UE still needs to continue to compare whether the member identifier of the first UE or the arrangement number of the first UE in the UE group is greater than the number of PSFCH resources to be selected. If the member identifier of the first UE or the arrangement number of the first UE in the UE group is greater than the number of PSFCH resources to be selected, the second UE does not detect the HARQ feedback information corresponding to the first PSSCH from the first UE, or the second UE receives the common part transmitted only by the first UE on the PSFCH corresponding to the first PSSCH.

[0240] In a possible embodiment, when the first parameter is greater than the number of PSFCH candidate resources, and the member identifier of the first UE or the arrangement number of the first UE in the UE group is less than or equal to the number of PSFCH candidate resources, the first UE determines the PSFCH resource corresponding to the first UE from the PSFCH candidate resources based on the member identifier of the first UE; the first UE sends a first PSFCH to the second UE on the PSFCH resource corresponding to the first UE, and the first PSFCH carries the HARQ feedback information corresponding to the first PSSCH. Optionally, the HARQ feedback information can be HARQ-ACK information or HARQ-NACK information.

[0241] Optionally, when the first parameter is greater than the number of PSFCH resources to be selected, and the member identifier of the first UE or the arrangement number of the first UE in the UE group is less than or equal to the number of PSFCH resources to be selected, the first UE determines to enable HARQ feedback. After the first UE determines to enable HARQ feedback, the first UE determines the PSFCH resource corresponding to the first UE from the PSFCH resources to be selected based on the member identifier of the first UE.

[0242] Accordingly, when the first parameter is greater than the number of PSFCH resources for selection, and the member identifier of the first UE or the arrangement number of the first UE in the UE group is less than or equal to the number of PSFCH resources for selection, the second UE determines the PSFCH resources corresponding to the first UE from the PSFCH resources for selection based on the member identifier of the first UE; the second UE receives the first PSFCH sent by the first UE on the PSFCH resources corresponding to the first UE, and the first PSFCH carries the HARQ feedback information corresponding to the first PSSCH.

[0243] That is to say, although the indication information indicates that HARQ feedback is not enabled, when the first parameter is greater than the number of PSFCH candidate resources, but the member identifier of the first UE or the arrangement sequence number of the first UE in the UE group is less than or equal to the number of PSFCH candidate resources, the first UE can normally use Option 2 to perform HARQ feedback.

[0244] For example, the first parameter is the number of UEs included in the UE group. The second UE is UEX, the UE group includes UE1, UE2 and UE3, the member identifier of UE1 is 1, the member identifier of UE2 is 2, and the member identifier of UE3 is 3. Assume that the number of PSFCH resources to be selected is 2. UEX compares the number of UEs included in the UE group with the number of PSFCH resources to be selected. Since the number of UEs included in the UE group is greater than the number of PSFCH resources to be selected, UEX multicasts the first PSSCH to the UE group, and the first PSSCH carries indication information, which indicates that HARQ feedback is not enabled.

[0245] After UE1 receives the first PSSCH, since the indication information indicates that HARQ feedback is not enabled, UE1 continues to compare the size between UE1's member identifier and the number of PSFCH candidate resources. Since UE1's member identifier is smaller than the number of PSFCH candidate resources, UE1 determines the PSFCH resource corresponding to UE1 from the PSFCH candidate resources, and then transmits the HARQ feedback information corresponding to the first PSSCH to UEX on the PSFCH resource. Correspondingly, based on the same principle, UEX can also determine the PSFCH resource corresponding to UE1 from the PSFCH candidate resources, and receive the HARQ feedback information corresponding to the first PSSCH sent by UE1 on the PSFCH resource.

[0246] After UE2 receives the first PSSCH, since the indication information indicates that HARQ feedback is not enabled, UE2 continues to compare the size between UE2's member identifier and the number of PSFCH candidate resources. Since UE2's member identifier is equal to the number of PSFCH candidate resources, UE2 determines the PSFCH resource corresponding to UE2 from the PSFCH candidate resources, and then transmits the HARQ feedback information corresponding to the first PSSCH to UEX on the PSFCH resource. Correspondingly, based on the same principle, UEX can also determine the PSFCH resource corresponding to UE2 from the PSFCH candidate resources, and receive the HARQ feedback information corresponding to the first PSSCH sent by UE2 on the PSFCH resource.

[0247] After UE3 receives the first PSSCH, since the indication information indicates that HARQ feedback is not enabled, UE3 continues to compare the size between UE3's member identifier and the number of PSFCH candidate resources. Since UE3's member identifier is greater than the number of PSFCH candidate resources, UE3 does not transmit the HARQ feedback information corresponding to the first PSSCH to UEX, or UE3 only transmits the common part on the PSFCH corresponding to the first PSSCH. Accordingly, based on the same principle, UEX does not detect the HARQ feedback information corresponding to the first PSSCH from UE3, or UEX receives the common part transmitted only by UE3 on the PSFCH corresponding to the first PSSCH.

[0248] It can be seen that based on Figure 6 According to the described method, the second UE can indicate not to enable HARQ feedback when the number of UEs included in the UE group is greater than the number of PSFCH candidate resources and the member identifier of the first UE or the arrangement number of the first UE in the UE group is less than or equal to the number of PSFCH candidate resources, thereby avoiding the situation where multiple UEs occupy one PSFCH candidate resource, and making the second UE more distinguishable about the situation where the UE in the UE group receives the first PSSCH. Figure 6 The described method can properly handle HARQ feedback when the number of PSFCH candidate resources is insufficient.

[0249] See also Figure 7 , Figure 7 A flow chart of an information feedback method provided in an embodiment of the present application.

[0250] 701. The second UE multicasts a first PSSCH to a UE group, the first PSSCH carrying indication information, the indication information indicating enabling HARQ feedback. Accordingly, the first UE can receive the first PSSCH multicast by the second UE to the UE group. The first UE is one of the UE group, and the UE group includes multiple UEs.

[0251] 702. When the first parameter is greater than the number of PSFCH candidate resources, the first UE determines a first PSFCH resource corresponding to the first UE from the PSFCH candidate resources.

[0252] The first parameter is obtained according to the member identifier of the first UE or the number of UEs included in the UE group or the arrangement number of the first UE in the UE group. For how to obtain the first parameter according to the member identifier of the first UE or the number of UEs included in the UE group or the arrangement number of the first UE in the UE group, please refer to Figure 2 The introduction in the corresponding embodiments will not be repeated here.

[0253] Two possible implementations of the first UE determining the first PSFCH resource corresponding to the first UE from the PSFCH candidate resources are introduced below:

[0254] 1. The first UE determines a first PSFCH resource corresponding to the first UE from PSFCH candidate resources based on the first member identifier of the first UE.

[0255] Optionally, the first UE may directly bring the first member identifier of the first UE into the existing resource determination algorithm of SL HARQ feedback Option 2 to determine the first PSFCH resource corresponding to the first UE.

[0256] Optionally, the first UE does not need to compare the first parameter with the number of PSFCH resources to be selected. As long as the indication information enables HARQ feedback, the first UE can directly bring the first member identifier of the first UE into the existing resource determination algorithm of SL HARQ feedback Option 2 to determine the first PSFCH resource corresponding to the first UE. In other words, regardless of whether the first parameter is greater than the number of PSFCH resources to be selected, the same method can be used to determine the PSFCH resource corresponding to the first UE.

[0257] 2. The first UE obtains the second member identifier of the first UE; the first UE determines the first PSFCH resource corresponding to the first UE from the PSFCH candidate resources based on the second member identifier of the first UE.

[0258] The second member identifier of the first UE can be understood as a new member identifier of the first UE. Optionally, after obtaining the second member identifier of the first UE, the first UE can bring the second member identifier of the first UE into the existing resource determination algorithm of SL HARQ feedback Option 2 to determine the first PSFCH resource corresponding to the first UE.

[0259] Optionally, the first UE may compare the first parameter with the number of PSFCH resources to be selected. If the first parameter is greater than the number of PSFCH resources to be selected, the first UE obtains the second member identifier of the first UE, and brings the second member identifier of the first UE into the existing resource determination algorithm of SL HARQ feedback Option 2 to determine the first PSFCH resource corresponding to the first UE. If the first parameter is less than or equal to the number of PSFCH resources to be selected, the first UE may bring the first member identifier of the first UE into the existing resource determination algorithm of SLHARQ feedback Option 2 to determine the second PSFCH resource corresponding to the first UE. In other words, the comparison results between the first parameter and the number of PSFCH resources to be selected are different, and different methods may be used to determine the PSFCH resource corresponding to the first UE.

[0260] In a possible embodiment, the second member identifier of the first UE is determined based on the first member identifier of the first UE and the number of PSFCH resources to be selected. For example, the second member identifier = the first member identifier mod (the number of PSFCH resources to be selected). Determining the second member identifier based on the first member identifier of the first UE and the number of PSFCH resources to be selected is conducive to making the PSFCH resources multiplexed by different UEs more dispersed, avoiding all UEs that need to multiplex PSFCH resources from selecting the same PSFCH resource, and making the load on different PSFCH resources more uniform.

[0261] In a possible embodiment, the second member identifier of the first UE is a fixed value predefined by the protocol. For example, the second member identifier may be 0, 1, 2, or other fixed values. By making the second member identifier of the first UE a fixed value, all UEs that need to multiplex the PSFCH resource can select the same PSFCH resource, so that more UEs can occupy a PSFCH resource alone, making it easier for the second UE to distinguish the situation where the UE in the UE group receives the first PSSCH.

[0262] In a possible embodiment, the second member identifier of the first UE is a random value in [0, number of PSFCH resources to be selected - 1]. By making the second member identifier of the first UE a random value, it is helpful to make the PSFCH resources multiplexed by different UEs more dispersed, avoid all UEs that need to multiplex PSFCH resources to select the same PSFCH resource, and make the load on different PSFCH resources more uniform.

[0263] 3. The first UE randomly selects a PSFCH candidate resource from the PSFCH candidate resources.

[0264] Optionally, the first UE may compare the first parameter with the number of PSFCH resources to be selected. If the first parameter is greater than the number of PSFCH resources to be selected, the first UE randomly selects a PSFCH resource to be selected from the PSFCH resources to be selected. If the first parameter is less than or equal to the number of PSFCH resources to be selected, the first UE brings the first member identifier of the first UE into the existing resource determination algorithm of SL HARQ feedback Option 2 to determine the second PSFCH resource corresponding to the first UE. In other words, the comparison results between the first parameter and the number of PSFCH resources to be selected are different, and different methods can be used to determine the PSFCH resource corresponding to the first UE.

[0265] By randomly selecting a PSFCH resource for the first UE, the PSFCH resources multiplexed by different UEs are more dispersed, avoiding all UEs that need to multiplex PSFCH resources from selecting the same PSFCH resource, and making the load on different PSFCH resources more uniform.

[0266] 703. The first UE sends a first PSFCH to the second UE on the first PSFCH resource corresponding to the first UE, where the first PSFCH carries HARQ feedback information corresponding to the first PSSCH. Accordingly, when the first parameter is greater than the number of PSFCH candidate resources, the second UE can receive the first PSFCH sent by the first UE on the first PSFCH resource corresponding to the first UE.

[0267] That is to say, in the embodiment of the present application, even if the first parameter is greater than the number of PSFCH resources to be selected, the first UE can still select a PSFCH resource for HARQ feedback.

[0268] In a possible embodiment, when the first parameter is greater than the number of PSFCH candidate resources, the second UE may also determine the first PSFCH resource corresponding to the first UE from the PSFCH candidate resources. After the second UE determines the first PSFCH resource corresponding to the first UE, it sends the first PSFCH to the second UE on the first PSFCH resource corresponding to the first UE.

[0269] There are two possible implementations for the second UE to determine the first PSFCH resource corresponding to the first UE from the PSFCH candidate resources:

[0270] 1. The second UE determines a first PSFCH resource corresponding to the first UE from PSFCH candidate resources based on the first member identifier of the first UE.

[0271] 2. The second UE obtains the second member identifier of the first UE; the first UE determines the first PSFCH resource corresponding to the first UE from the PSFCH candidate resources based on the second member identifier of the first UE.

[0272] In a possible embodiment, the second member identifier of the first UE is determined based on the first member identifier of the first UE and the number of PSFCH candidate resources. For example, the second member identifier=the first member identifier mod (the number of PSFCH candidate resources).

[0273] In a possible embodiment, the second member identifier of the first UE is a fixed value predefined by a protocol. For example, the second member identifier may be 0, 1, 2, or other fixed values.

[0274] The specific principles of these two possible implementations of the second UE determining the first PSFCH resource corresponding to the first UE from the PSFCH candidate resources can be found in the previous introduction of the first UE determining the first PSFCH resource corresponding to the first UE from the PSFCH candidate resources, which will not be repeated here.

[0275] In a possible embodiment, the second UE may not perform the operation of determining the first PSFCH resource corresponding to the first UE. For example, if the first PSFCH resource corresponding to the first UE is a PSFCH resource randomly selected by the first UE, or the first UE determines the first PSFCH resource corresponding to the first UE from the PSFCH candidate resources based on the second member identifier of the first UE, and the second member identifier of the first UE is a random value, then when the second UE determines that the first parameter is greater than the number of PSFCH candidate resources, the second UE may not perform the operation of determining the first PSFCH resource corresponding to the first UE.

[0276] In a possible embodiment, when the first parameter is less than or equal to the number of PSFCH candidate resources, the first UE determines the second PSFCH resource corresponding to the first UE from the PSFCH candidate resources based on the first member identifier of the first UE; the first UE sends the first PSFCH to the second UE on the second PSFCH resource corresponding to the first UE.

[0277] Accordingly, when the first parameter is less than or equal to the number of PSFCH candidate resources, the second UE determines the second PSFCH resource corresponding to the first UE from the PSFCH candidate resources based on the first member identifier of the first UE; the second UE receives the first PSFCH sent by the first UE on the first PSFCH resource corresponding to the first UE. For example, the first UE / second UE can directly bring the first member identifier of the first UE into the existing resource determination algorithm of SL HARQ feedback Option 2 to determine the second PSFCH resource corresponding to the first UE.

[0278] In a possible embodiment, if all HARQ feedback information corresponding to the received first PSSCH is HARQ-ACK information, an ACK value is reported to the upper layer; otherwise, a NACK value is reported to the upper layer.

[0279] For example, if ACK information is detected on the PSFCH resources corresponding to each UE in the UE group, and NACK information is not detected on the PSFCH resources corresponding to each UE in the UE group, an ACK value is reported to the upper layer. Otherwise, a NACK value is reported to the upper layer (report an ACK value to higher layers if the UE determines an ACK valuefrom at least one PSFCH reception occasion from the number of PSFCH receptionoccasions in PSFCH resources corresponding to every identity M_"ID"of UEs andabsent on all the PSFCH resources mapping to "HARQ-NACK"corresponding to everyidentity M_"ID"of UEs that the UE expects to receive corresponding PSSCHs asdescribed in clause 16.3; otherwise, report a NACK value to higher layers).

[0280] For another example, if ACK information is detected on the PSFCH resource corresponding to each UE in the UE group, and NACK information is not detected on the PSFCH resource corresponding to each UE in the UE group, the ACK value is reported to the upper layer. If ACK information is detected on the PSFCH resource corresponding to each UE in the UE group, and NACK information is detected on the PSFCH resource corresponding to at least one UE in the UE group, the NACK value is reported to the upper layer.In other cases, report an ACK value to higher layers if the UE determines an ACK value from at least one PSFCHreception occasion from the number of PSFCH reception occasions in PSFCHresources corresponding to every identity M_"ID" of UEs and absent on thePSFCH resources mapping to "HARQ-NACK" that the UE expects to receivecorresponding PSSCHs as described in clause 16.3; report an NACK value tohigher layers if the UE determines an ACK value from at least one PSFCHreception occasion from the number of PSFCH reception occasions in PSFCHresources corresponding to every identity M_"ID"of UEs and NACK value from atleast one PSFCH reception occasion from the number of PSFCH receptionoccasions in PSFCH resources corresponding to any identity M_"ID"of UEs thatthe UE expects to receive corresponding PSSCHs as described in clause 16.3; otherwise, report a NACK value to higher layers).

[0281] The following introduces several possible implementations of whether to transmit HARQ feedback information and the common part:

[0282] When the first parameter is greater than the number of PSFCH candidate resources and HARQ-ACK information:

[0283] 1. The first UE sends HARQ-ACK information + common part.

[0284] That is to say, when the first parameter is greater than the number of PSFCH selected resources and the HARQ feedback information is HARQ-ACK information, in addition to sending the first PSFCH to the second UE on the first PSFCH resource corresponding to the first UE, and the first PSFCH carries the HARQ-ACK information corresponding to the first PSSCH, the first UE can also transmit the common part on another PSFCH corresponding to the first PSSCH.

[0285] Accordingly, when the first parameter is greater than the number of PSFCH selected resources and the HARQ feedback information is HARQ-ACK information, in addition to receiving the first PSFCH sent by the first UE on the first PSFCH resource corresponding to the first UE, where the first PSFCH carries the HARQ-ACK information corresponding to the first PSSCH, the second UE can also receive the common part transmitted by the first UE on another PSFCH corresponding to the first PSSCH.

[0286] The common part is a signal sent by the UE in SL-U to occupy the channel so as not to be occupied by other UEs or WiFi.

[0287] 2. The first UE sends only the common part.

[0288] That is, step 703 and step 704 are performed when the first parameter is greater than the number of PSFCH resources to be selected and HARQ-NACK information is provided. When the first parameter is greater than the number of PSFCH resources to be selected and HARQ-ACK information is provided, the first UE transmits only the common part on the PSFCH corresponding to the first PSSCH. Accordingly, when the first parameter is greater than the number of PSFCH resources to be selected and the HARQ feedback information is HARQ-ACK information, the second UE receives the common part transmitted only by the first UE on the PSFCH corresponding to the first PSSCH.

[0289] When the first parameter is greater than the number of PSFCH candidate resources and HARQ-NACK information is present:

[0290] 1. The first UE sends HARQ-ACK information + common part.

[0291] That is to say, when the first parameter is greater than the number of PSFCH selected resources and the HARQ feedback information is HARQ-NACK information, in addition to sending the first PSFCH to the second UE on the first PSFCH resource corresponding to the first UE, and the first PSFCH carries the HARQ-NACK information corresponding to the first PSSCH, the first UE can also transmit the common part on another PSFCH corresponding to the first PSSCH.

[0292] Accordingly, when the first parameter is greater than the number of PSFCH selected resources and the HARQ feedback information is HARQ-NACK information, in addition to receiving the first PSFCH sent by the first UE on the first PSFCH resource corresponding to the first UE, where the first PSFCH carries the HARQ-NACK information corresponding to the first PSSCH, the second UE can also receive the common part transmitted by the first UE on another PSFCH corresponding to the first PSSCH.

[0293] 2. The first UE only sends HARQ-NACK information.

[0294] That is, when the first parameter is greater than the number of PSFCH candidate resources and the HARQ feedback information is HARQ-NACK information, the first UE sends a first PSFCH to the second UE on the first PSFCH resource corresponding to the first UE, and the first PSFCH carries the HARQ-NACK information corresponding to the first PSSCH. The first UE does not transmit the common part on another PSFCH corresponding to the first PSSCH.

[0295] It can be seen that based on Figure 7 The described method can select a PSFCH resource for HARQ feedback even if the first parameter is greater than the number of PSFCH candidate resources. This is more distinguishable than the existing Option 1 where all UEs occupy one PSFCH resource. Even if multiple UEs occupy one PSFCH resource, some UEs may still occupy one PSFCH resource alone. Figure 7 The described method can properly handle HARQ feedback when the number of PSFCH candidate resources is insufficient.

[0296] See also Figure 8 , Figure 8 A flow chart of an information feedback method provided in an embodiment of the present application.

[0297] 801. A second UE multicasts a first PSSCH to a UE group, where the first PSSCH carries indication information, where the indication information indicates enabling HARQ feedback. Accordingly, a first UE may receive the first PSSCH multicast by the second UE to the UE group. The first UE is one of the UE group, and the UE group includes multiple UEs.

[0298] 802. When the first parameter is greater than the number of PSFCH resources to be selected, and the member identifier of the first UE or the arrangement number of the first UE in the UE group is greater than the number of PSFCH resources to be selected, the first UE determines the first PSFCH resource corresponding to the first UE from the PSFCH resources to be selected.

[0299] The first parameter is obtained according to the number of UEs included in the UE group. For details on how to obtain the first parameter according to the number of UEs included in the UE group, see Figure 2 The description in the corresponding embodiment is not repeated here.

[0300] 803. The first UE sends a first PSFCH to the second UE on the first PSFCH resource corresponding to the first UE, where the first PSFCH carries HARQ feedback information corresponding to the first PSSCH. Accordingly, when the first parameter is greater than the number of PSFCH candidate resources and the member identifier of the first UE or the arrangement sequence number of the first UE in the UE group is greater than the number of PSFCH candidate resources, the second UE receives the first PSFCH sent by the first UE on the first PSFCH resource corresponding to the first UE.

[0301] That is to say, in an embodiment of the present application, even if the first parameter is greater than the number of PSFCH candidate resources, when the member identifier of the first UE or the arrangement sequence number of the first UE in the UE group is greater than the number of PSFCH candidate resources, the first UE can still select a PSFCH resource for HARQ feedback.

[0302] In a possible embodiment, when the first parameter is greater than the number of PSFCH candidate resources, and when the member identifier of the first UE or the arrangement number of the first UE in the UE group is greater than the number of PSFCH candidate resources, the second UE may also determine the first PSFCH resource corresponding to the first UE from the PSFCH candidate resources. After the second UE determines the first PSFCH resource corresponding to the first UE, the first PSFCH is sent to the second UE on the first PSFCH resource corresponding to the first UE.

[0303] In the embodiment of the present application, the specific implementation method of the first UE / second UE determining the first PSFCH resource corresponding to the first UE from the PSFCH candidate resources can be found in Figure 7 The description in the corresponding embodiments will not be repeated here.

[0304] In a possible embodiment, when the first parameter is greater than the number of PSFCH resources to be selected, and the member identifier of the first UE or the arrangement number of the first UE in the UE group is less than or equal to the number of PSFCH resources to be selected, the second PSFCH resource corresponding to the first UE is determined from the PSFCH resources to be selected based on the first member identifier of the first UE; the first UE sends the first PSFCH to the second UE on the second PSFCH resource corresponding to the first UE.

[0305] Accordingly, when the first parameter is greater than the number of PSFCH candidate resources, and the member identifier of the first UE or the arrangement number of the first UE in the UE group is less than or equal to the number of PSFCH candidate resources, the second UE determines the second PSFCH resource corresponding to the first UE from the PSFCH candidate resources based on the first member identifier of the first UE; the second UE receives the first PSFCH sent by the first UE on the first PSFCH resource corresponding to the first UE. For example, the first UE / second UE can directly bring the first member identifier of the first UE into the existing resource determination algorithm of SL HARQ feedback Option 2 to determine the second PSFCH resource corresponding to the first UE.

[0306] In a possible embodiment, when the first parameter is less than or equal to the number of PSFCH candidate resources, the first UE determines the second PSFCH resource corresponding to the first UE from the PSFCH candidate resources based on the first member identifier of the first UE; the first UE sends the first PSFCH to the second UE on the second PSFCH resource corresponding to the first UE.

[0307] Accordingly, when the first parameter is less than or equal to the number of PSFCH candidate resources, the second UE determines the second PSFCH resource corresponding to the first UE from the PSFCH candidate resources based on the first member identifier of the first UE; the second UE receives the first PSFCH sent by the first UE on the first PSFCH resource corresponding to the first UE. For example, the first UE / second UE can directly bring the first member identifier of the first UE into the existing resource determination algorithm of SL HARQ feedback Option 2 to determine the second PSFCH resource corresponding to the first UE.

[0308] In a possible embodiment, if all HARQ feedback information corresponding to the received first PSSCH is HARQ-ACK information, an ACK value is reported to the upper layer; otherwise, a NACK value is reported to the upper layer. For a detailed description, see Figure 7 The description in the corresponding embodiment is not repeated here.

[0309] In the embodiment of the present application, the possible implementation methods of whether the HARQ feedback information and the common part are transmitted can be referred to Figure 7 The corresponding embodiments are not described in detail here.

[0310] It can be seen that based on Figure 8 The described method can select a PSFCH resource for HARQ feedback even if the first parameter is greater than the number of PSFCH resources to be selected and the member identifier of the first UE or the ranking number of the first UE in the UE group is greater than the number of PSFCH resources to be selected. Compared with the existing Option 1 where all UEs occupy one PSFCH resource, the method is more distinguishable. Even if multiple UEs occupy one PSFCH resource, some UEs may still occupy one PSFCH resource alone. Figure 8 The described method can properly handle HARQ feedback when the number of PSFCH candidate resources is insufficient.

[0311] The present application provides a communication device that can be used to implement the functions of the first UE or the second UE. The communication device can be the first UE or the second UE. The communication device includes a module or unit corresponding to the method / operation / step / action performed by the first UE or the second UE in the above method embodiment. The unit can be a hardware circuit, or software, or a combination of a hardware circuit and software. Fig. 9 , Fig. 9 A schematic diagram of the structure of a communication device 900 according to an embodiment of the present application is shown. The communication device 900 may include an interface unit 901 and a processing unit 902. Specifically, the processing unit 902 is used to process signaling and / or data, the signaling and / or data may be data received by the interface unit 901, and the processed signaling and / or data may also be sent by the interface unit 901;

[0312] In one implementation, when the communication device 900 is a first UE, wherein:

[0313] The interface unit 901 is configured to receive a first physical direct link shared channel PSSCH multicasted by a second UE to a UE group, where the first UE is one of the UE group, and the UE group includes a plurality of UEs;

[0314] The interface unit 901 is configured to not transmit the hybrid automatic repeat request HARQ feedback information corresponding to the first PSSCH to the second UE when the first parameter is greater than the number of candidate resources of the physical direct link feedback channel PSFCH, or to transmit only the common part on the PSFCH corresponding to the first PSSCH;

[0315] The first parameter is obtained according to the member identifier of the first UE or the number of UEs included in the UE group or the arrangement sequence number of the first UE in the UE group.

[0316] In a possible embodiment, the first PSSCH carries indication information, where the indication information indicates enabling HARQ feedback.

[0317] In a possible embodiment, the first parameter is obtained according to the member identifier of the first UE or the arrangement sequence number of the first UE in the UE group; the processing unit 902 is used to determine the PSFCH resources corresponding to the first UE from the PSFCH candidate resources based on the member identifier of the first UE when the first parameter is less than or equal to the number of PSFCH candidate resources; the interface unit 901 is also used to send a first PSFCH to the second UE on the PSFCH resources corresponding to the first UE, and the first PSFCH carries the HARQ feedback information corresponding to the first PSSCH.

[0318] In a possible embodiment, the processing unit 902 is further configured to determine not to enable HARQ feedback when the first parameter is greater than the number of PSFCH candidate resources.

[0319] In a possible embodiment, the processing unit 902 is further configured to determine to enable HARQ feedback when the first parameter is less than or equal to the number of PSFCH candidate resources.

[0320] In a possible embodiment, the first parameter is obtained according to the number of UEs included in the UE group;

[0321] When the first parameter is greater than the number of PSFCH candidate resources, the interface unit 901 does not transmit the HARQ feedback information corresponding to the first PSSCH to the second UE, or transmits only the common part on the PSFCH corresponding to the first PSSCH, including:

[0322] When the first parameter is greater than the number of PSFCH resources to be selected, and the member identifier of the first UE or the arrangement number of the first UE in the UE group is greater than the number of PSFCH resources to be selected, the HARQ feedback information corresponding to the first PSSCH is not transmitted to the second UE, or only the common part is transmitted on the PSFCH corresponding to the first PSSCH.

[0323] In a possible embodiment, the processing unit 902 is also used to determine the PSFCH resources corresponding to the first UE from the PSFCH candidate resources based on the member identifier of the first UE when the first parameter is greater than the number of PSFCH candidate resources and the member identifier of the first UE or the arrangement number of the first UE in the UE group is less than or equal to the number of PSFCH candidate resources; the interface unit 901 is also used to send a first PSFCH to the second UE on the PSFCH resources corresponding to the first UE, and the first PSFCH carries HARQ feedback information corresponding to the first PSSCH.

[0324] In a possible embodiment, the processing unit 902 is further used to determine not to enable HARQ feedback when the first parameter is greater than the number of PSFCH candidate resources and the member identifier of the first UE or the arrangement sequence number of the first UE in the UE group is greater than the number of PSFCH candidate resources.

[0325] In a possible embodiment, the processing unit 902 is further used to determine to enable HARQ feedback when the first parameter is greater than the number of PSFCH candidate resources and the member identifier of the first UE or the arrangement sequence number of the first UE in the UE group is less than or equal to the number of PSFCH candidate resources.

[0326] In a possible embodiment, the first parameter is obtained according to the number of UEs included in the UE group; the first PSSCH carries indication information; when the first parameter is greater than the number of PSFCH selectable resources, the indication information indicates that HARQ feedback is not enabled.

[0327] In a possible embodiment, when the first parameter is less than or equal to the number of PSFCH candidate resources, the indication information indicates enabling HARQ feedback.

[0328] In a possible embodiment, when the first parameter of the interface unit 901 is greater than the number of PSFCH resources to be selected, the first UE does not transmit the HARQ feedback information corresponding to the first PSSCH to the second UE, or the first UE only transmits the common part on the PSFCH corresponding to the first PSSCH, including: when the first parameter is greater than the number of PSFCH resources to be selected and the member identifier of the first UE or the arrangement sequence number of the first UE in the UE group is greater than the number of PSFCH resources to be selected, the HARQ feedback information corresponding to the first PSSCH is not transmitted to the second UE, or the first UE only transmits the common part on the PSFCH corresponding to the first PSSCH.

[0329] In a possible embodiment, the processing unit 902 is also used to determine the PSFCH resources corresponding to the first UE from the PSFCH candidate resources based on the member identifier of the first UE when the first parameter is greater than the number of PSFCH candidate resources and the member identifier of the first UE or the arrangement number of the first UE in the UE group is less than or equal to the number of PSFCH candidate resources; the interface unit 901 is also used to send a first PSFCH to the second UE on the PSFCH resources corresponding to the first UE, and the first PSFCH carries HARQ feedback information corresponding to the first PSSCH.

[0330] In a possible embodiment, the first parameter is obtained according to the member identifier of the first UE or the number of UEs included in the UE group or the arrangement number of the first UE in the UE group, including: the first parameter is the member identifier of the first UE or the number of UEs included in the UE group or the arrangement number of the first UE in the UE group.

[0331] In a possible embodiment, the interface unit 901 receives the first PSSCH multicast by the second UE to the UE group, including: the interface unit 901 receives the first PSSCH multicast by the second UE to the UE group in a shared spectrum or an unlicensed spectrum.

[0332] In one implementation, when the communication device 900 is a second UE, wherein:

[0333] The interface unit 901 is configured to multicast a first physical direct link shared channel PSSCH to a UE group, where the UE group includes a plurality of UEs;

[0334] The interface unit 901 is further configured to, when the first parameter is greater than the number of candidate resources for a physical direct link feedback channel PSFCH, not detect the hybrid automatic repeat request HARQ feedback information corresponding to the first PSSCH from the first UE, or the second UE receives only the common part transmitted by the first UE on the PSFCH corresponding to the first PSSCH;

[0335] The first parameter is obtained according to the member identifier of the first UE or the number of UEs included in the UE group or the arrangement sequence number of the first UE in the UE group, and the first UE is one of the UEs in the UE group.

[0336] In a possible embodiment, the first PSSCH carries indication information, where the indication information indicates enabling HARQ feedback.

[0337] In a possible embodiment, the first parameter is obtained according to the member identifier of the first UE or the arrangement sequence number of the first UE in the UE group; the processing unit 902 is also used to determine the PSFCH resources corresponding to the first UE from the PSFCH candidate resources based on the member identifier of the first UE when the first parameter is less than or equal to the number of PSFCH candidate resources; the interface unit 901 is also used to receive the first PSFCH sent by the first UE on the PSFCH resources corresponding to the first UE, and the first PSFCH carries the HARQ feedback information corresponding to the first PSSCH.

[0338] In a possible embodiment, the first parameter is obtained according to the number of UEs included in the UE group;

[0339] When the first parameter is greater than the number of PSFCH candidate resources, the interface unit 901 does not detect the HARQ feedback information corresponding to the first PSSCH from the first UE, or receives the common part transmitted only by the first UE on the PSFCH corresponding to the first PSSCH, including:

[0340] When the first parameter is greater than the number of PSFCH resources to be selected, and the member identifier of the first UE or the arrangement number of the first UE in the UE group is greater than the number of PSFCH resources to be selected, the HARQ feedback information corresponding to the first PSSCH from the first UE is not detected, or the common part transmitted only by the first UE on the PSFCH corresponding to the first PSSCH is received.

[0341] In a possible embodiment, the processing unit 902 is also used to determine the PSFCH resources corresponding to the first UE from the PSFCH candidate resources based on the member identifier of the first UE when the first parameter is greater than the number of PSFCH candidate resources and the member identifier of the first UE or the arrangement number of the first UE in the UE group is less than or equal to the number of PSFCH candidate resources; the interface unit 901 is also used to receive the first PSFCH sent by the first UE on the PSFCH resources corresponding to the first UE, and the first PSFCH carries the HARQ feedback information corresponding to the first PSSCH.

[0342] In a possible embodiment, the first parameter is obtained according to the number of UEs included in the UE group;

[0343] The first PSSCH carries indication information; when the first parameter is greater than the number of PSFCH candidate resources, the indication information indicates that HARQ feedback is not enabled.

[0344] In a possible embodiment, when the first parameter is less than or equal to the number of PSFCH candidate resources, the indication information indicates enabling HARQ feedback.

[0345] In a possible embodiment, when the first parameter is greater than the number of PSFCH candidate resources, the interface unit 901 does not detect the HARQ feedback information corresponding to the first PSSCH from the first UE, or receives the common part transmitted only by the first UE on the PSFCH corresponding to the first PSSCH, including:

[0346] When the first parameter is greater than the number of PSFCH resources to be selected, and the member identifier of the first UE or the arrangement number of the first UE in the UE group is greater than the number of PSFCH resources to be selected, the HARQ feedback information corresponding to the first PSSCH from the first UE is not detected, or the common part transmitted only by the first UE on the PSFCH corresponding to the first PSSCH is received.

[0347] In a possible embodiment, the processing unit 902 is also used to determine the PSFCH resources corresponding to the first UE from the PSFCH candidate resources based on the member identifier of the first UE when the first parameter is greater than the number of PSFCH candidate resources and the member identifier of the first UE or the arrangement number of the first UE in the UE group is less than or equal to the number of PSFCH candidate resources; the interface unit 901 is also used to receive the first PSFCH sent by the first UE on the PSFCH resources corresponding to the first UE, and the first PSFCH carries the HARQ feedback information corresponding to the first PSSCH.

[0348] In a possible embodiment, the first parameter is obtained according to the member identifier of the first UE or the number of UEs included in the UE group or the arrangement number of the first UE in the UE group, including: the first parameter is the member identifier of the first UE or the number of UEs included in the UE group or the arrangement number of the first UE in the UE group.

[0349] In a possible embodiment, the interface unit 901 multicasts the first PSSCH to the UE group, including:

[0350] The interface unit 901 multicasts the first PSSCH to the UE group in the shared spectrum or the unlicensed spectrum.

[0351] In one implementation, when the communication device 900 is a first UE, wherein:

[0352] The interface unit 901 is configured to receive a first PSSCH multicasted by a second UE to a UE group, where the first UE is one of the UE group, the UE group includes a plurality of UEs, and the first PSSCH carries indication information, where the indication information indicates enabling HARQ feedback;

[0353] The processing unit 902 is configured to determine, when the first parameter is greater than the number of physical direct link feedback channel PSFCH candidate resources, a first PSFCH resource corresponding to the first UE from the PSFCH candidate resources; the first parameter is obtained according to the first member identifier of the first UE or the number of UEs included in the UE group or the arrangement sequence number of the first UE in the UE group;

[0354] The interface unit 901 is further configured to send a first PSFCH to the second UE on a first PSFCH resource corresponding to the first UE, where the first PSFCH carries HARQ feedback information corresponding to the first PSSCH.

[0355] In a possible embodiment, the processing unit 902 determines the first PSFCH resource corresponding to the first UE from the PSFCH candidate resources, including:

[0356] A first PSFCH resource corresponding to the first UE is determined from PSFCH candidate resources based on the first member identifier of the first UE.

[0357] In a possible embodiment, the processing unit 902 determines the first PSFCH resource corresponding to the first UE from the PSFCH candidate resources, including:

[0358] Obtaining a second member identifier of the first UE;

[0359] A first PSFCH resource corresponding to the first UE is determined from PSFCH candidate resources based on the second member identifier of the first UE.

[0360] In a possible embodiment, the second member identifier of the first UE is determined based on the first member identifier of the first UE and the number of PSFCH selectable resources;

[0361] Alternatively, the second member identifier of the first UE is a fixed value predefined by a protocol;

[0362] Alternatively, the second member identifier of the first UE is a random value in [0, number of PSFCH selected resources - 1].

[0363] In a possible embodiment, the first parameter is obtained according to the first member identifier of the first UE or the arrangement sequence number of the first UE in the UE group;

[0364] The processing unit 902 is also used to determine the second PSFCH resource corresponding to the first UE from the PSFCH candidate resources based on the first member identifier of the first UE when the first parameter is less than or equal to the number of PSFCH candidate resources; the interface unit 901 is also used to send the first PSFCH to the second UE on the second PSFCH resource corresponding to the first UE.

[0365] In a possible embodiment, the first parameter is obtained according to the number of UEs included in the UE group;

[0366] When the first parameter is greater than the number of PSFCH candidate resources, the processing unit 902 determines the first PSFCH resource corresponding to the first UE from the PSFCH candidate resources, including:

[0367] When the first parameter is greater than the number of PSFCH candidate resources and the member identifier of the first UE or the arrangement number of the first UE in the UE group is greater than the number of PSFCH candidate resources, the first PSFCH resource corresponding to the first UE is determined from the PSFCH candidate resources.

[0368] In a possible embodiment, the processing unit 902 is also used to determine the second PSFCH resource corresponding to the first UE from the PSFCH candidate resources based on the first member identifier of the first UE when the first parameter is greater than the number of PSFCH candidate resources and the member identifier of the first UE or the arrangement number of the first UE in the UE group is less than or equal to the number of PSFCH candidate resources; the interface unit 901 is also used to send the first PSFCH to the second UE on the second PSFCH resource corresponding to the first UE.

[0369] In a possible embodiment, the interface unit 901 is further used to transmit the common part on the PSFCH corresponding to the first PSSCH when the first parameter is greater than the number of PSFCH candidate resources and the HARQ feedback information is HARQ-ACK information.

[0370] In a possible embodiment, the interface unit 901 sends the first PSFCH to the second UE on the first PSFCH resource corresponding to the first UE, including:

[0371] When the HARQ feedback information is HARQ-NACK information, sending a first PSFCH to the second UE on a first PSFCH resource corresponding to the first UE;

[0372] The interface unit 901 is further configured to transmit the common part only on the PSFCH corresponding to the first PSSCH when the first parameter is greater than the number of PSFCH candidate resources and the HARQ feedback information is HARQ-ACK information.

[0373] In a possible embodiment, the interface unit 901 is further configured to transmit the common part on the PSFCH corresponding to the first PSSCH when the first parameter is greater than the number of PSFCH candidate resources and the HARQ feedback information is HARQ-NACK information.

[0374] In a possible embodiment, the first parameter is obtained according to the member identifier of the first UE or the number of UEs included in the UE group or the arrangement number of the first UE in the UE group, including: the first parameter is the member identifier of the first UE or the number of UEs included in the UE group or the arrangement number of the first UE in the UE group.

[0375] In a possible embodiment, the interface unit 901 receives the first PSSCH multicast by the second UE to the UE group, including: the interface unit 901 receives the first PSSCH multicast by the second UE to the UE group in a shared spectrum or an unlicensed spectrum.

[0376] In one implementation, when the communication device 900 is a second UE, wherein:

[0377] The interface unit 901 is configured to multicast a first physical direct link shared channel PSSCH to a UE group, where the UE group includes multiple UEs, a first UE is one of the UE group, and the first PSSCH carries indication information, where the indication information indicates enabling HARQ feedback;

[0378] The processing unit 902 is configured to receive, when the first parameter is greater than the number of physical direct link feedback channel PSFCH candidate resources, a first PSFCH sent by the first UE on a first PSFCH resource corresponding to the first UE, where the first PSFCH carries HARQ feedback information corresponding to the first PSSCH;

[0379] The first parameter is obtained according to the first member identifier of the first UE or the number of UEs included in the UE group or the arrangement sequence number of the first UE in the UE group.

[0380] In a possible embodiment, the interface unit 901 is further configured to determine, when the first parameter is greater than the number of PSFCH candidate resources, a first PSFCH resource corresponding to the first UE from the PSFCH candidate resources.

[0381] In a possible embodiment, the processing unit 902 determines the first PSFCH resource corresponding to the first UE from the PSFCH candidate resources, including:

[0382] A first PSFCH resource corresponding to the first UE is determined from PSFCH candidate resources based on the first member identifier of the first UE.

[0383] In a possible embodiment, the processing unit 902 determines the first PSFCH resource corresponding to the first UE from the PSFCH candidate resources, including:

[0384] Obtaining a second member identifier of the first UE;

[0385] A first PSFCH resource corresponding to the first UE is determined from PSFCH candidate resources based on the second member identifier of the first UE.

[0386] In a possible embodiment, the second member identifier of the first UE is determined based on the first member identifier of the first UE and the number of PSFCH selectable resources;

[0387] Alternatively, the second member identifier of the first UE is a fixed value predefined by a protocol.

[0388] In a possible embodiment, the first parameter is obtained according to the first member identifier of the first UE or the arrangement sequence number of the first UE in the UE group, and the processing unit 902 is also used to determine the second PSFCH resource corresponding to the first UE from the PSFCH candidate resources based on the first member identifier of the first UE when the first parameter is less than or equal to the number of PSFCH candidate resources; the interface unit 901 is also used to receive the first PSFCH sent by the first UE on the first PSFCH resource corresponding to the first UE.

[0389] In a possible embodiment, the first parameter is obtained according to the number of UEs included in the UE group;

[0390] When the first parameter is greater than the number of PSFCH candidate resources, the interface unit 901 receives a first PSFCH sent by the first UE on a first PSFCH resource corresponding to the first UE, including:

[0391] When the first parameter is greater than the number of PSFCH resources to be selected and the member identifier of the first UE or the arrangement number of the first UE in the UE group is greater than the number of PSFCH resources to be selected, the first PSFCH sent by the first UE is received on the first PSFCH resource corresponding to the first UE.

[0392] In a possible embodiment, the processing unit 902 is also used to determine the second PSFCH resource corresponding to the first UE from the PSFCH candidate resources based on the first member identifier of the first UE when the first parameter is greater than the number of PSFCH candidate resources and the member identifier of the first UE or the arrangement sequence number of the first UE in the UE group is less than or equal to the number of PSFCH candidate resources; the interface unit 901 is also used to receive the first PSFCH sent by the first UE on the first PSFCH resource corresponding to the first UE.

[0393] In a possible embodiment, the interface unit 901 is further used to receive the common part transmitted by the first UE on the PSFCH corresponding to the first PSSCH when the first parameter is greater than the number of PSFCH candidate resources and the HARQ feedback information is HARQ-ACK information.

[0394] In a possible embodiment, the interface unit 901 receives a first PSFCH sent by the first UE on a first PSFCH resource corresponding to the first UE, including:

[0395] When the HARQ feedback information is HARQ-NACK information, receiving a first PSFCH sent by the first UE on a first PSFCH resource corresponding to the first UE;

[0396] The interface unit 901 is also used to receive the common part transmitted only by the first UE on the PSFCH corresponding to the first PSSCH when the first parameter is greater than the number of PSFCH candidate resources and the HARQ feedback information is HARQ-ACK information.

[0397] In a possible embodiment, the interface unit 901 is further configured to receive the common part transmitted by the first UE on the PSFCH corresponding to the first PSSCH when the first parameter is greater than the number of PSFCH candidate resources and the HARQ feedback information is HARQ-NACK information.

[0398] In a possible embodiment, the processing unit 902 is further configured to report an ACK value to the upper layer if all HARQ feedback information corresponding to the received first PSSCH is HARQ-ACK information; otherwise, report a NACK value to the upper layer.

[0399] In a possible embodiment, the first parameter is obtained according to the member identifier of the first UE or the number of UEs included in the UE group or the arrangement number of the first UE in the UE group, including: the first parameter is the member identifier of the first UE or the number of UEs included in the UE group or the arrangement number of the first UE in the UE group.

[0400] In a possible embodiment, the interface unit 901 multicasts the first PSSCH to the UE group, including:

[0401] The interface unit 901 multicasts the first PSSCH to the UE group in the shared spectrum or the unlicensed spectrum.

[0402] like Fig.10 A communication device 1000 provided in an embodiment of the present application is shown, which is used to implement the functions of the first UE or the second UE. The device may be a communication device or a device used in a communication device. The communication device may be the first UE or the second UE. The device used in the communication device may be a chip system or a chip in the communication device. Among them, the chip system may be composed of a chip, or may include a chip and other discrete devices.

[0403] The communication device 1000 includes at least one processor 1010, which is used to implement the processing function of the device (e.g., the first UE or the second UE) in the method provided in the embodiment of the present application. The communication device 1000 may also include a communication interface 1020, which is used to implement the transceiver operation of the device (e.g., the first UE or the second UE) in the method provided in the embodiment of the present application. In the embodiment of the present application, the communication interface can be a transceiver, a circuit, a bus, a module, or other types of communication interfaces, which are used to communicate with other devices through a transmission medium. For example, the communication interface 1020 is used for the device in the communication device 1000 to communicate with other devices. The processor 1010 uses the communication interface 1020 to send and receive data, and is used to implement the method described in the above method embodiment.

[0404] The communication device 1000 may also include at least one memory 1030 for storing program instructions and / or data. The memory 1030 is coupled to the processor 1010. The coupling in the embodiment of the present application is an indirect coupling or communication connection between devices, units or modules, which may be electrical, mechanical or other forms, and is used for information exchange between devices, units or modules. The processor 1010 may operate in conjunction with the memory 1030. The processor 1010 may execute program instructions stored in the memory 1030. At least one of the at least one memory may be included in the processor.

[0405] The specific connection medium between the communication interface 1020, the processor 1010 and the memory 1030 is not limited in the embodiment of the present application. Fig.10 The memory 1030, the processor 1010 and the communication interface 1020 are connected via a bus. Fig.10 The connections between the other components are shown in bold lines, which are only for illustration and are not intended to be limiting. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Fig.10 Only one thick line is used in the diagram, but this does not mean that there is only one bus or only one type of bus.

[0406] When the communication device 1000 is specifically a device for a device (e.g., a first UE or a second UE), for example, when the communication device 1000 is specifically a chip or a chip system, the communication interface 1020 may output or receive a baseband signal. When the communication device 1000 is specifically a device (e.g., a first UE or a second UE), the communication interface 1020 may output or receive a radio frequency signal. In an embodiment of the present application, the processor may be a general-purpose processor, a digital signal processor, an application-specific integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component, and may implement or execute the various methods, steps, and logic block diagrams disclosed in the embodiments of the present application. A general-purpose processor may be a microprocessor or any conventional processor, etc. The steps of the method disclosed in conjunction with the embodiments of the present application may be directly embodied as being executed by a hardware processor, or may be executed by a combination of hardware and software modules in the processor.

[0407] It should be noted that the above-mentioned communication interface 1020 can be used to execute the function of the above-mentioned interface unit 901, and the above-mentioned processor 1010 can be used to execute the function of the above-mentioned processing unit 902, which will not be repeated here.

[0408] When the above-mentioned communication device is a chip applied to the first UE or the second UE, the chip implements the functions of the first UE or the second UE in the above-mentioned method embodiment, and the chip receives information from other network elements; or, the chip sends information to other network elements.

[0409] It is understood that the processor in the embodiments of the present application may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application specific integrated circuits (ASIC), field programmable gate arrays (FPGA) or other programmable logic devices, transistor logic devices, hardware components or any combination thereof. The general-purpose processor may be a microprocessor or any conventional processor.

[0410] The method steps in the embodiments of the present application can be implemented by hardware or by a processor executing software instructions. The software instructions can be composed of corresponding software modules, and the software modules can be stored in random access memory (RAM), flash memory, read-only memory (ROM), programmable ROM (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), registers, hard disks, mobile hard disks, CD-ROMs, or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor so that the processor can read information from the storage medium and write information to the storage medium. Of course, the storage medium can also be a component of the processor. The processor and the storage medium can be located in an ASIC. In addition, the ASIC can be located in a core network device or a terminal. Of course, the processor and the storage medium can also exist as discrete components in the first UE or the second UE.

[0411] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer programs or instructions. When the computer program or instruction is loaded and executed on a computer, the process or function described in the embodiment of the present application is executed in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer program or instruction may be stored in a computer-readable storage medium or transmitted through the computer-readable storage medium. The computer-readable storage medium may be any available medium that a computer can access or a data storage device such as a server that integrates one or more available media. The available medium may be a magnetic medium, such as a floppy disk, a hard disk, or a tape; it may also be an optical medium, such as a DVD; it may also be a semiconductor medium, such as a solid state disk (SSD).

[0412] In the various embodiments of the present application, unless otherwise specified or provided for in any logical conflict, the terms and / or descriptions between the different embodiments are consistent and may be referenced to each other, and the technical features in the different embodiments may be combined to form new embodiments according to their inherent logical relationships.

[0413] It is understood that the various numbers involved in the embodiments of the present application are only for the convenience of description and are not used to limit the scope of the embodiments of the present application. The size of the sequence number of the above-mentioned processes does not mean the order of execution, and the execution order of each process should be determined by its function and internal logic.

[0414] An embodiment of the present application further provides a computer-readable storage medium, in which computer-executable instructions are stored. When the computer-executable instructions are executed, the method executed by the first UE or the second UE in the above method embodiment is implemented.

[0415] An embodiment of the present application further provides a computer program product, which includes a computer program. When the computer program is executed, the method executed by the first UE or the second UE in the above method embodiment is implemented.

[0416] The embodiment of the present application further provides a communication system, the communication system comprising a first UE and a second UE, wherein the first UE is used to execute the method executed by the first UE in the above method embodiment, and the second UE is used to execute the method executed by the second UE in the above method embodiment.

[0417] It should be noted that, for the aforementioned method embodiments, for the sake of simplicity, they are all expressed as a series of action combinations, but those skilled in the art should be aware that the present application is not limited by the described order of actions, because according to the present application, certain steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present application.

[0418] The descriptions of the various embodiments provided in this application can refer to each other, and the descriptions of the various embodiments have their own emphasis. For parts that are not described in detail in a certain embodiment, refer to the relevant descriptions of other embodiments. For the convenience and simplicity of description, for example, the functions of the various devices and equipment provided in the embodiments of this application and the steps of execution can refer to the relevant descriptions of the method embodiments of this application, and the various method embodiments and the various device embodiments can also refer to, combine or quote each other.

[0419] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An information feedback method, characterized in that: The method comprises: A first user equipment UE receives a first physical direct link shared channel PSSCH multicasted by a second UE to a UE group, where the first UE is one of the UE group, and the UE group includes a plurality of UEs; When the first parameter is greater than the number of candidate resources of the physical direct link feedback channel PSFCH, the first UE does not transmit the hybrid automatic repeat request HARQ feedback information corresponding to the first PSSCH to the second UE, or the first UE transmits only the common part on the PSFCH corresponding to the first PSSCH; The first parameter is obtained according to the member identifier of the first UE or the number of UEs included in the UE group or the arrangement sequence number of the first UE in the UE group.

2. The method according to claim 1, characterized in that The first PSSCH carries indication information, where the indication information indicates enabling HARQ feedback.

3. The method according to claim 2, characterized in that The first parameter is obtained according to a member identifier of the first UE or an arrangement sequence number of the first UE in the UE group, and the method further includes: When the first parameter is less than or equal to the number of PSFCH candidate resources, the first UE determines the PSFCH resource corresponding to the first UE from the PSFCH candidate resources based on the member identifier of the first UE; The first UE sends a first PSFCH to the second UE on the PSFCH resources corresponding to the first UE, and the first PSFCH carries HARQ feedback information corresponding to the first PSSCH.

4. The method according to claim 2 or 3, characterized in that: The method further comprises: When the first parameter is greater than the number of PSFCH candidate resources, it is determined not to enable HARQ feedback.

5. The method according to claim 3, characterized in that: The method further comprises: When the first parameter is less than or equal to the number of PSFCH candidate resources, it is determined to enable HARQ feedback.

6. The method according to claim 2, characterized in that The first parameter is obtained according to the number of UEs included in the UE group; When the first parameter is greater than the number of PSFCH candidate resources, the first UE does not transmit the HARQ feedback information corresponding to the first PSSCH to the second UE, or the first UE transmits only the common part on the PSFCH corresponding to the first PSSCH, including: When the first parameter is greater than the number of PSFCH candidate resources and the member identifier of the first UE or the arrangement number of the first UE in the UE group is greater than the number of PSFCH candidate resources, the first UE does not transmit the HARQ feedback information corresponding to the first PSSCH to the second UE, or the first UE only transmits the common part on the PSFCH corresponding to the first PSSCH.

7. The method according to claim 6, characterized in that The method further comprises: When the first parameter is greater than the number of PSFCH resources for selection, and the member identifier of the first UE or the arrangement number of the first UE in the UE group is less than or equal to the number of PSFCH resources for selection, the first UE determines the PSFCH resources corresponding to the first UE from the PSFCH resources for selection based on the member identifier of the first UE; the first UE sends a first PSFCH to the second UE on the PSFCH resources corresponding to the first UE, and the first PSFCH carries the HARQ feedback information corresponding to the first PSSCH.

8. The method according to claim 6 or 7, characterized in that: The method further comprises: When the first parameter is greater than the number of PSFCH candidate resources and the member identifier of the first UE or the arrangement sequence number of the first UE in the UE group is greater than the number of PSFCH candidate resources, it is determined not to enable HARQ feedback.

9. The method according to claim 7, characterized in that: The method further comprises: When the first parameter is greater than the number of PSFCH candidate resources and the member identifier of the first UE or the arrangement sequence number of the first UE in the UE group is less than or equal to the number of PSFCH candidate resources, it is determined to enable HARQ feedback.

10. The method according to claim 1, characterized in that The first parameter is obtained according to the number of UEs included in the UE group; the first PSSCH carries indication information; when the first parameter is greater than the number of PSFCH selectable resources, the indication information indicates that HARQ feedback is not enabled.

11. The method according to claim 10, characterized in that When the first parameter is less than or equal to the number of PSFCH candidate resources, the indication information indicates enabling HARQ feedback.

12. The method according to claim 10 or 11, characterized in that: When the first parameter is greater than the number of PSFCH candidate resources, the first UE does not transmit the HARQ feedback information corresponding to the first PSSCH to the second UE, or the first UE transmits only the common part on the PSFCH corresponding to the first PSSCH, including: When the first parameter is greater than the number of PSFCH candidate resources and the member identifier of the first UE or the arrangement number of the first UE in the UE group is greater than the number of PSFCH candidate resources, the first UE does not transmit the HARQ feedback information corresponding to the first PSSCH to the second UE, or the first UE only transmits the common part on the PSFCH corresponding to the first PSSCH.

13. The method according to claim 12, characterized in that The method further comprises: When the first parameter is greater than the number of PSFCH candidate resources, and the member identifier of the first UE or the arrangement number of the first UE in the UE group is less than or equal to the number of PSFCH candidate resources, the first UE determines the PSFCH resources corresponding to the first UE from the PSFCH candidate resources based on the member identifier of the first UE; the first UE sends a first PSFCH to the second UE on the PSFCH resources corresponding to the first UE, and the first PSFCH carries the HARQ feedback information corresponding to the first PSSCH.

14. The method according to any one of claims 1 to 13, characterized in that: The first parameter is obtained according to a member identifier of the first UE, the number of UEs included in the UE group, or an arrangement sequence number of the first UE in the UE group, including: The first parameter is a member identifier of the first UE, the number of UEs included in the UE group, or an arrangement sequence number of the first UE in the UE group.

15. The method according to any one of claims 1 to 14, characterized in that: The first UE receiving a first PSSCH multicasted by a second UE to a UE group includes: The first UE receives the first PSSCH multicast by the second UE to the UE group in the shared spectrum or the unlicensed spectrum.

16. An information feedback method, characterized in that: The method comprises: The second user equipment UE multicasts a first physical direct link shared channel PSSCH to a UE group, where the UE group includes a plurality of UEs; When the first parameter is greater than the number of candidate resources of the physical direct link feedback channel PSFCH, the second UE does not detect the hybrid automatic repeat request HARQ feedback information corresponding to the first PSSCH from the first UE, or the second UE receives only the common part transmitted by the first UE on the PSFCH corresponding to the first PSSCH; The first parameter is obtained according to the member identifier of the first UE or the number of UEs included in the UE group or the arrangement sequence number of the first UE in the UE group, and the first UE is one of the UE group.

17. The method according to claim 16, characterized in that The first PSSCH carries indication information, where the indication information indicates enabling HARQ feedback.

18. The method according to claim 17, characterized in that The first parameter is obtained according to a member identifier of the first UE or an arrangement sequence number of the first UE in the UE group, and the method further includes: When the first parameter is less than or equal to the number of PSFCH candidate resources, the second UE determines the PSFCH resource corresponding to the first UE from the PSFCH candidate resources based on the member identifier of the first UE; The second UE receives the first PSFCH sent by the first UE on the PSFCH resources corresponding to the first UE, and the first PSFCH carries HARQ feedback information corresponding to the first PSSCH.

19. The method according to claim 17, characterized in that The first parameter is obtained according to the number of UEs included in the UE group; When the first parameter is greater than the number of PSFCH candidate resources, the second UE does not detect the HARQ feedback information corresponding to the first PSSCH from the first UE, or the second UE receives only the common part transmitted by the first UE on the PSFCH corresponding to the first PSSCH, including: When the first parameter is greater than the number of PSFCH candidate resources and the member identifier of the first UE or the arrangement number of the first UE in the UE group is greater than the number of PSFCH candidate resources, the second UE does not detect the HARQ feedback information corresponding to the first PSSCH from the first UE, or the second UE receives the common part transmitted only by the first UE on the PSFCH corresponding to the first PSSCH.

20. The method according to claim 19, characterized in that The method further comprises: When the first parameter is greater than the number of PSFCH candidate resources, and the member identifier of the first UE or the arrangement number of the first UE in the UE group is less than or equal to the number of PSFCH candidate resources, the second UE determines the PSFCH resources corresponding to the first UE from the PSFCH candidate resources based on the member identifier of the first UE; the second UE receives the first PSFCH sent by the first UE on the PSFCH resources corresponding to the first UE, and the first PSFCH carries the HARQ feedback information corresponding to the first PSSCH.

21. The method according to claim 16, characterized in that The first parameter is obtained according to the number of UEs included in the UE group; The first PSSCH carries indication information; when the first parameter is greater than the number of PSFCH candidate resources, the indication information indicates that HARQ feedback is not enabled.

22. The method according to claim 21, characterized in that When the first parameter is less than or equal to the number of PSFCH candidate resources, the indication information indicates enabling HARQ feedback.

23. The method according to claim 21 or 22, characterized in that When the first parameter is greater than the number of PSFCH candidate resources, the second UE does not detect the HARQ feedback information corresponding to the first PSSCH from the first UE, or the second UE receives only the common part transmitted by the first UE on the PSFCH corresponding to the first PSSCH, including: When the first parameter is greater than the number of PSFCH candidate resources and the member identifier of the first UE or the arrangement number of the first UE in the UE group is greater than the number of PSFCH candidate resources, the second UE does not detect the HARQ feedback information corresponding to the first PSSCH from the first UE, or the second UE receives the common part transmitted only by the first UE on the PSFCH corresponding to the first PSSCH.

24. The method according to claim 23, characterized in that The method further comprises: When the first parameter is greater than the number of PSFCH candidate resources, and the member identifier of the first UE or the arrangement number of the first UE in the UE group is less than or equal to the number of PSFCH candidate resources, the second UE determines the PSFCH resources corresponding to the first UE from the PSFCH candidate resources based on the member identifier of the first UE; the second UE receives the first PSFCH sent by the first UE on the PSFCH resources corresponding to the first UE, and the first PSFCH carries the HARQ feedback information corresponding to the first PSSCH.

25. The method according to any one of claims 16 to 24, characterized in that: The first parameter is obtained according to a member identifier of the first UE, the number of UEs included in the UE group, or an arrangement sequence number of the first UE in the UE group, including: The first parameter is a member identifier of the first UE, the number of UEs included in the UE group, or an arrangement sequence number of the first UE in the UE group.

26. The method according to any one of claims 16 to 25, characterized in that: The second UE multicasts the first PSSCH to the UE group, including: The second UE multicasts the first PSSCH to the UE group in the shared spectrum or the unlicensed spectrum.

27. A communication device, characterized in that: The method comprises a unit for executing the method according to any one of claims 1 to 15, or comprises a unit for executing the method according to any one of claims 16 to 26.

28. A communication device, characterized in that: The method comprises a processor and a memory, wherein the processor and the memory are coupled, and the processor is used to implement the method according to any one of claims 1 to 15, or the processor is used to implement the method according to any one of claims 16 to 26.

29. A chip, characterized in that: The invention comprises a processor and an interface, wherein the processor and the interface are coupled; the interface is used to receive or output signals, and the processor is used to execute code instructions so that the method described in any one of claims 1 to 15 is executed, or the method described in any one of claims 16 to 26 is executed.

30. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer-executable instructions, which, when called by the computer, enable the computer to execute the method described in any one of claims 1 to 15, or enable the computer to execute the method described in any one of claims 16 to 26.

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