Information feedback method and communication apparatus

Abstract

Provided in the present application are an information feedback method and a communication apparatus. The method comprises: a first UE receives a first PSSCH multicast by a second UE to a UE group, the first UE being one of those in the UE group, and the UE group comprising a plurality of UEs; and, when a first parameter is greater than the number of PSFCH resources to be selected, the first UE does not transmit to the second UE HARQ feedback information corresponding to the first PSSCH, or the first UE transmits merely a common part on a PSFCH corresponding to the first PSSCH, the first parameter being obtained on the basis of a member identifier of the first UE or the number of the UEs comprised in the UE group or the sequence number of the first UE in the UE group. Thus, in the method, when there are insufficient PSFCH resources to be selected, the first UE does not send the HARQ feedback information corresponding to the first PSSCH, thereby avoiding situations in which multiple UEs occupy a single PSFCH resource to be selected.

Description

Information feedback method and communication device

[0001] This application claims priority to the Chinese patent application with application number 202311447795.6 filed with the State Intellectual Property Office of China on October 31, 2023, and priority to the Chinese patent application with the invention name “Information Feedback Method and Communication Device”, all contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of communication technology, and in particular to an information feedback method and a communication device. Background Art

[0003] Hybrid automatic repeat request (HARQ) feedback information for a physical sidelink shared channel (PSSCH) is transmitted over the physical sidelink feedback channel (PSFCH). SL HARQ feedback is supported only in unicast and multicast scenarios. The specific information transmitted is as follows:

[0004] 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).

[0005] There are two options for multicast:

[0006] Option 1: If decoding fails after decoding the PSCCH, the receiving UE transmits a HARQ-NACK. Otherwise, no signal is transmitted. All receiving UEs in a group can share the same PSFCH resource.

[0007] Option 2: If decoding is successful, the receiving UE transmits HARQ-ACK; otherwise, if decoding fails, the receiving UE transmits HARQ-NACK. Each UE is supported to use a separate PSFCH resource.

[0008] Sidelink unlicense (SL-U) in unlicensed spectrum is a key topic discussed in the Release 18 standard. It focuses on sidelink transmission in unlicensed spectrum. During the SL-U discussion, some companies have consistently opposed Option 1 for multicast, and there is a certain possibility that SL-U will not support Option 1 for multicast in the future. Supporting only Option 2 for multicast may lead to insufficient PSFCH feedback resources. When PSFCH feedback resources are insufficient, how to properly handle HARQ feedback is a pressing technical issue.

[0009] Summary of the Invention

[0010] The present application provides an information feedback method and a communication device, which can reasonably process HARQ feedback when PSFCH feedback resources are insufficient.

[0011] In a first aspect, the present application provides an information feedback method, the method comprising:

[0012] A first user equipment UE receives a first physical direct link shared channel PSSCH multicast by a second UE to a UE group, where 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 selectable resources of 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 transmits only a common part on the PSFCH corresponding to the first PSSCH; wherein the first parameter is obtained based on 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.

[0013] It can be seen that based on the method described in the first aspect, 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 enabling the second UE to better distinguish the situation where UEs in the UE group receive the first PSSCH. Therefore, based on the method described in the first aspect, HARQ feedback can be reasonably processed when the number of PSFCH candidate resources is insufficient.

[0014] In a possible embodiment, the first PSSCH carries indication information, where the indication information indicates enabling HARQ feedback.

[0015] Based on this possible embodiment, even if HARQ feedback is enabled, 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 discriminating about the situation where the UE in the UE group receives the first PSSCH.

[0016] 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.

[0017] When the first parameter 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 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.

[0018] 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.

[0019] 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.

[0020] 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.

[0021] In a possible embodiment, the first parameter is obtained according to the number of UEs included in the UE group;

[0022] 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:

[0023] 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.

[0024] Based on this possible embodiment, even if HARQ feedback is enabled, the first UE can not send the 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 number of the first UE in the UE group is greater than the number of PSFCH candidate resources. This can avoid the situation where multiple UEs occupy one PSFCH candidate resource, and make the second UE more discriminating about the situation where the UEs in the UE group receive the first PSSCH.

[0025] 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 resource 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 resource corresponding to the first UE, and the first PSFCH carries the HARQ feedback information corresponding to the first PSSCH.

[0026] 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 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 less than or equal to the number of PSFCH resources to be selected.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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 UEs in the UE group receive the first PSSCH.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] Based on this possible embodiment, even if HARQ feedback is enabled, the first UE can not send the 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 number of the first UE in the UE group is greater than the number of PSFCH candidate resources. This can avoid the situation where multiple UEs occupy one PSFCH candidate resource, and make the second UE more discriminating about the situation where the UEs in the UE group receive the first PSSCH.

[0035] 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 resource 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 resource corresponding to the first UE, and the first PSFCH carries the HARQ feedback information corresponding to the first PSSCH.

[0036] 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 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 less than or equal to the number of PSFCH resources to be selected.

[0037] 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.

[0038] In a possible embodiment, the first UE receives the first PSSCH multicasted by the second UE to the UE group, including: the first UE receives the first PSSCH multicasted by the second UE to the UE group in a shared spectrum or an unlicensed spectrum.

[0039] In a second aspect, the present application provides an information feedback method, the method comprising:

[0040] The second user equipment UE multicasts the first physical direct link shared channel PSSCH to the UE group, where 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 only the common part transmitted by the first UE on the PSFCH corresponding to the first PSSCH; wherein the first parameter is obtained based on 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.

[0041] In a possible embodiment, the first PSSCH carries indication information, where the indication information indicates enabling HARQ feedback.

[0042] 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.

[0043] 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.

[0044] In a possible embodiment, the first parameter is obtained according to the number of UEs included in the UE group;

[0045] 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:

[0046] 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 only the common part transmitted by the first UE on the PSFCH corresponding to the first PSSCH.

[0047] 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 resource 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 resource corresponding to the first UE, and the first PSFCH carries the HARQ feedback information corresponding to the first PSSCH.

[0048] In a possible embodiment, the first parameter is obtained according to the number of UEs included in the UE group;

[0049] 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.

[0050] 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.

[0051] 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:

[0052] 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 only the common part transmitted by the first UE on the PSFCH corresponding to the first PSSCH.

[0053] 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 resource 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 resource corresponding to the first UE, and the first PSFCH carries the HARQ feedback information corresponding to the first PSSCH.

[0054] 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.

[0055] 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.

[0056] The beneficial effects of the second aspect can be referred to the beneficial effects of the first aspect, and will not be repeated here.

[0057] In a third aspect, the present application provides an information feedback method, the method comprising:

[0058] The first UE receives the first PSSCH multicast by the second UE to the UE group, where 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 based on 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.

[0059] As can be seen, 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 still select a PSFCH resource for HARQ feedback. Compared with the existing Option 1 where all UEs occupy one PSFCH resource, this method is more differentiated. Even if multiple UEs occupy one PSFCH resource, some UEs may still occupy a PSFCH resource independently. Therefore, based on the method described in the third aspect, HARQ feedback can be properly processed when the number of PSFCH candidate resources is insufficient.

[0060] In a possible embodiment, the first UE determines a first PSFCH resource corresponding to the first UE from PSFCH candidate resources, including:

[0061] 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.

[0062] 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 selecting the same PSFCH resource, and making the load on different PSFCH resources more uniform.

[0063] In a possible embodiment, the first UE determines a first PSFCH resource corresponding to the first UE from PSFCH candidate resources, including:

[0064] 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.

[0065] 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;

[0066] Alternatively, the second member identifier of the first UE is a fixed value predefined by a protocol;

[0067] Alternatively, the second member identifier of the first UE is a random value in [0, number of PSFCH selected resources - 1].

[0068] 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.

[0069] 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, 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.

[0070] By making the second member identifier of the first UE a random value, the PSFCH resources multiplexed by different UEs are more dispersed, avoiding that all UEs that need to multiplex PSFCH resources select the same PSFCH resource, and making the load on different PSFCH resources more uniform.

[0071] 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.

[0072] 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.

[0073] 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.

[0074] In a possible embodiment, the first parameter is obtained according to the number of UEs included in the UE group;

[0075] 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:

[0076] 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 the first PSFCH resource corresponding to the first UE from the PSFCH candidate resources.

[0077] 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 discriminatory. Even if multiple UEs occupy one PSFCH resource, some UEs may still occupy one PSFCH resource alone.

[0078] 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 can also determine the second PSFCH resource corresponding to the first UE 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.

[0079] 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.

[0080] 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.

[0081] In a possible embodiment, the first UE sending the first PSFCH to the second UE on the first PSFCH resource corresponding to the first UE includes:

[0082] 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;

[0083] The method also includes:

[0084] 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.

[0085] 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.

[0086] 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.

[0087] In a possible embodiment, the first UE receives the first PSSCH multicasted by the second UE to the UE group, including: the first UE receives the first PSSCH multicasted by the second UE to the UE group in a shared spectrum or an unlicensed spectrum.

[0088] In a fourth aspect, the present application provides an information feedback method, the method comprising:

[0089] The second UE multicasts the first physical direct link shared channel PSSCH to the UE group, where the UE group includes multiple UEs, the first UE is one of the UE group, and the first PSSCH carries indication information, which indicates that HARQ feedback is enabled; 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.

[0090] 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.

[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 determines the first PSFCH resource corresponding to the first UE from the PSFCH candidate resources based on the first member identifier of the first UE.

[0093] In a possible embodiment, the second UE determines the first PSFCH resource corresponding to the first UE from the PSFCH candidate resources, including:

[0094] The second UE obtains the second member identifier of the first UE; and 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.

[0095] 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;

[0096] Alternatively, the second member identifier of the first UE is a fixed value predefined by a protocol.

[0097] In a possible embodiment, the first parameter is obtained based on 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 candidate resources, the second UE can also 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; the second UE receives the first PSFCH sent by the first UE on the first PSFCH resource corresponding to the first UE.

[0098] In a possible embodiment, the first parameter is obtained according to the number of UEs included in the UE group;

[0099] 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:

[0100] 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.

[0101] 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 can also determine the second PSFCH resource corresponding to the first UE from the PSFCH resources to be selected 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.

[0102] 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.

[0103] In a possible embodiment, the second UE receiving the first PSFCH sent by the first UE on the first PSFCH resource corresponding to the first UE includes:

[0104] 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;

[0105] The method also includes:

[0106] 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.

[0107] 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.

[0108] 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.

[0109] 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.

[0110] 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.

[0111] The beneficial effects of the fourth aspect can be found in the beneficial effects of the third aspect, which will not be repeated here.

[0112] 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, chip, or chip system, and may also be a logical node, logic module, or software that can implement all or part of the first UE function. For another example, the communication device may be a module of a second UE, such as a processor, chip, or chip system, and may also be a logical node, logic module, or software that can implement all or part of the second UE function. The communication device includes a module / unit for performing any method of the first to fourth aspects and their possible implementations.

[0113] In the sixth aspect, the present application provides a communication device, including a processor, the processor and a memory are coupled, 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 above-mentioned first to fourth aspects.

[0114] 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 above-mentioned first to fourth aspects.

[0115] 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.

[0116] 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.

[0117] In a tenth aspect, the present application provides a 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

[0118] FIG1 is a schematic diagram of the architecture of a communication system provided by the present application;

[0119] FIG2 is a flow chart of an information feedback method provided by this application;

[0120] FIG3 is a flow chart of an information feedback method provided by the present application;

[0121] FIG4 is a flow chart of an information feedback method provided by the present application;

[0122] FIG5 is a flow chart of an information feedback method provided by the present application;

[0123] FIG6 is a flow chart of an information feedback method provided by this application;

[0124] FIG7 is a flow chart of an information feedback method provided by the present application;

[0125] FIG8 is a flow chart of an information feedback method provided by the present application;

[0126] FIG9 is a schematic structural diagram of a communication device 900 provided in this application;

[0127] FIG10 is a schematic structural diagram of another communication device 1000 provided in this application. DETAILED DESCRIPTION

[0128] The specific embodiments of the present application are further described in detail below with reference to the accompanying drawings.

[0129] The terms "first" and "second" and the like in the specification, claims, and drawings of this application are used to distinguish between different objects, not to describe a particular order. Furthermore, the terms "including" and "having," and any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus comprising a series of steps or elements is not limited to the listed steps or elements, but may optionally include steps or elements not listed, or may optionally include other steps or elements inherent to the process, method, product, or apparatus.

[0130] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0131] In this application, "at least one (item)" refers to one or more, "more than one" refers to two or more, "at least two (items)" refers to two or three and more than three, and "and / or" is used to describe the association relationship of associated objects, indicating that there can be three relationships. 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.

[0132] In order to properly process HARQ feedback when PSFCH feedback resources are insufficient, the present invention provides an information feedback method and communication device. To better understand the present invention, the following first introduces the system architecture involved in the present invention:

[0133] The technical solutions of the embodiments of the present application can be applied to various communication systems, such as: 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.

[0134] Figure 1 is a schematic diagram of the architecture of a communication system provided in an embodiment of the present application, to which the solution of the present application is applicable. The communication system may include a UE X and a UE group, wherein the UE group includes UE 1, UE 2, and UE 3. Figure 1 uses an example in which the UE group includes three UEs. Of course, the number of UEs in the UE group may also be two or more, and this embodiment of the present application is not limited thereto.

[0135] Among them, UE includes a device that provides voice and / or data connectivity to users. For example, UE is a device with wireless transceiver capabilities, which can be deployed on land, including indoors or outdoors, handheld, wearable or vehicle-mounted; it can also be deployed on the water (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, a computer with wireless transceiver capabilities, 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 self-driving, a vehicle, a roadside device, an aircraft, a wireless terminal in remote medical care, a wireless terminal in a smart grid, a wireless terminal in transportation safety, a wireless terminal in a smart city, a wireless terminal in a smart home, a wearable terminal device, etc. The embodiments of the present application do not limit the application scenarios. UE may also sometimes be 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 embodiments of the present application, the device for implementing the function of the UE may be a UE, or a device that can support the 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 the UE.

[0136] In the embodiment of the present application, UEX can communicate directly with other UEs (such as UE1, UE2, and UE3). The link between UEs is called a sidelink (SL). For example, UEX and UE1 in Figure 1 can communicate directly via SL. UEX and UE2 can communicate directly via SL. UEX and UE3 can communicate directly via SL.

[0137] There are two transmission modes or resource allocation methods on the SL: Mode 1 and Mode 2. In Mode 1, the access network device centrally allocates resources to the sending UE. 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.

[0138] In mode 2, the transmitting UE autonomously selects available resources from a resource pool through sensing. The selected resources can be used once, for a period of time, or a certain number of times. Typically, the transmitting UE is configured with multiple resource pools, each with its own unique configuration, to meet the needs of different services. The transmitting UE selects a resource pool that meets its service requirements. If multiple resource pools remain available, the transmitting UE randomly selects one for data transmission.

[0139] In this 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 for a PSSCH is carried by the PSFCH. The UEs in the UE group have the following two SL HARQ feedback options:

[0140] Option 1: If decoding fails after decoding the PSCCH, the receiving UE transmits a HARQ-NACK. Otherwise, no signal is transmitted. All receiving UEs in the UE group can share the same PSFCH resource.

[0141] Option 2: If decoding is successful, the receiving UE transmits HARQ-ACK; otherwise, if decoding fails, the receiving UE transmits HARQ-NACK. Each UE in the UE group is supported to use a separate PSFCH resource.

[0142] 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 supporting Option 2 for 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 that can reasonably handle HARQ feedback when PSFCH feedback resources are insufficient.

[0143] 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 examples of the execution subjects of the interaction diagram, but the present application does not limit the execution subjects of the interaction diagram. For example, the first UE in the method provided by the present application can also be a chip, chip system, or processor applied to the first UE, or a logical node, 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 can also be a chip, chip system, or processor applied to the second UE, or a logical node, logical module, or software that can implement all or part of the second UE.

[0144] Please refer to Figure 2, which is a flow chart of an information feedback method provided in an embodiment of the present application.

[0145] 201. A second UE multicasts a first PSSCH to a UE group. Correspondingly, a first UE receives the first PSSCH multicast by the second UE to the UE group. The first UE is one of the UEs in the UE group, which includes multiple UEs.

[0146] For example, the second UE may be UEX in Figure 1 , and the UE group includes UE1, UE2, and UE3 in Figure 1 . The first UE may be UE1, UE2, or UE3 in Figure 1 , i.e., the first UE may be any one of the UE group. The execution principles for any UE in the UE group are the same, so the embodiments of the present application use one UE in the UE group as an example to illustrate the execution principles for all UEs in the UE group.

[0147] 202. When the first parameter is greater than the number of PSFCH selectable 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 based on a member identifier of the first UE, the number of UEs included in a UE group, or an arrangement sequence number of the first UE in the UE group.

[0148] In this 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 HARQ feedback information corresponding to the first PSSCH. The common part is a signal sent by the UE in the SL-U to occupy the channel to avoid being occupied by other UEs or WiFi. The common part occupies one PRB, that is, every N PRB interval carries a signal. N is a positive integer, for example, N can be 5, 10, etc.

[0149] 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, so 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, so as to avoid the first UE occupying the PSFCH candidate resources.

[0150] In the embodiment of the present application, the member identifier of the first UE refers to the member identifier (member ID) of the first UE in the UE group. Optionally, the member identifier of the first UE can 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 can be a non-random value generated in sequence. For example, the member identifier of the UE can also be taken as a starting value of 0. The member identifier of UE1 can be 0, the member identifier of UE2 can be 1, and the member identifier of UE3 can be 2. Optionally, the member identifier of the UE can also be taken as a starting value of 1 or a value greater than 1, which is not limited in the embodiment of the present application.

[0151] Optionally, the arrangement sequence number of the UEs in the UE group may be an arrangement sequence number obtained by arranging the UEs from largest to smallest 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 UEs in the UE group may be obtained by arranging the UEs in another order, which is not limited in the embodiments of the present application.

[0152] 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.

[0153] For example, let's assume the first parameter is the member ID of the first UE. Member IDs are 1, 2, 3, 4, 5, and 6. In this case, the groupsize is 6, and the number of PSFCH resources to be selected is 4. Then, UEs with member IDs 5 and 6 are UEs whose first parameter is greater than the number of PSFCH resources to be selected. The same applies to the embodiments corresponding to Figures 3 to 8 and will not be further described below.

[0154] For another example, the member IDs are ranked from front to back as 01, 03, 05, 08, 02, and 04, respectively. In this case, 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, then 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 order of the first UE in the UE group, then 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. The same applies to the embodiments corresponding to Figures 3 to 8, and will not be repeated here.

[0155] 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 UE's member identifier begins with 0, the first parameter may be the member identifier of the first UE+1. If the starting value of the UE's member identifier begins with 2, the first parameter may be the member identifier of the first UE-1.

[0156] 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.

[0157] In another possible embodiment, the first parameter may be the permutation number of the first UE in the UE group + 1, or the first parameter may be the permutation number of the first UE in the UE group - 1. For example, if the permutation number of the UE in the UE group starts with 0, the first parameter may be the permutation number of the first UE in the UE group + 1. If the permutation number of the UE in the UE group starts with 2, the first parameter may be the permutation number of the first UE in the UE group - 1.

[0158] In a possible embodiment, steps 202 and 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 case where the first parameter is the member identifier of the first UE. The member IDs are 0, 1, 2, 3, 4, 5, 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 number of PSFCH resources to be selected. The embodiments corresponding to Figures 3 to 8 are similar and will not be described in detail below.

[0159] In the 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. The embodiments corresponding to Figures 3 to 6 are similar and will not be repeated hereafter.

[0160] In a resource pool, PSFCH resources appear in a periodicity of M slots, where M currently takes values ​​of 1, 2, and 4. For a PSSCH appearing 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, typically 2 or 3 time slots. Therefore, when PSFCH resources appear in a periodicity of M, M PSSCHs corresponding to the PSFCHs will need to share a PSFCH resource.

[0161] 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.

[0162] In this 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 only the common part transmitted 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.

[0163] If 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 may receive only the common part transmitted by the first UE on the PSFCH corresponding to the first PSSCH.

[0164] In one 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, where 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.

[0165] Accordingly, 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.

[0166] That is to say, when there are sufficient PSFCH candidate resources, the first UE can normally use Option 2 to perform HARQ feedback. Optionally, when 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 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 resource corresponding to the first UE.

[0167] 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.

[0168] 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 this 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 this PSFCH resource.

[0169] 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 only the common part transmitted by UE3 on the PSFCH corresponding to the first PSSCH.

[0170] The same applies 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.

[0171] In one possible embodiment, the second UE multicasts the first PSSCH to the UE group in a shared spectrum or unlicensed spectrum. Accordingly, the first UE receives the first PSSCH multicast by the second UE to the UE group in the shared spectrum or unlicensed spectrum. In other words, the sidelink transmission between the first UE and the UEs in the UE group is on the unlicensed spectrum. The same applies to the embodiments corresponding to Figures 3 to 8 and will not be further described below.

[0172] That is to say, in the embodiments of the present application:

[0173] If group size is greater than the number of candidate PSFCH resources associated with this sidelink grant, the UE does not transmit PSFCH conveying HARQ information.And / Or,

[0174] if 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.And / Or,

[0175] 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.

[0176] As can be seen, based on the method described in Figure 2, 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 a PSFCH candidate resource, and enabling the second UE to better distinguish the situation of UEs in the UE group receiving the first PSSCH. Therefore, based on the method described in Figure 2, HARQ feedback can be properly processed when the number of PSFCH candidate resources is insufficient.

[0177] Please refer to Figure 3, which is a flow chart of an information feedback method provided in an embodiment of the present application.

[0178] 301. A second UE multicasts a first PSSCH to a UE group. The first PSSCH carries indication information indicating that HARQ feedback is enabled. Accordingly, a first UE receives the first PSSCH multicast by the second UE to the UE group. The first UE is one of the UEs in the UE group, which includes multiple UEs.

[0179] Optionally, the indication information may be included in the second-level sidelink control information, and the second-level sidelink control information is carried on the first PSSCH.

[0180] 302. When the first parameter is greater than the number of PSFCH selectable resources, 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.

[0181] The first parameter is obtained based on the member identifier of the first UE, the number of UEs included in the UE group, or the arrangement number of the first UE in the UE group. How the first parameter is obtained based on the member identifier of the first UE, the number of UEs included in the UE group, or the arrangement number of the first UE in the UE group can be found in the introduction of the embodiment corresponding to Figure 2 and is not repeated here.

[0182] 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.

[0183] In one 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 portion on the PSFCH corresponding to the first PSSCH.

[0184] 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.

[0185] In an embodiment of the present application, when HARQ feedback is enabled, after the second UE multicasts the first PSSCH, 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 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.

[0186] In one 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, where 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.

[0187] Accordingly, 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.

[0188] 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.

[0189] In one 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 first UE determines a PSFCH resource corresponding to the first UE from the PSFCH candidate resources based on the member identifier of the first UE, and then sends the first PSFCH to the second UE on the PSFCH resource corresponding to the first UE.

[0190] 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.

[0191] In another possible embodiment, the first parameter is obtained based on 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 candidate resources, the second UE does not expect the first UEs whose corresponding first parameters are greater than the number of PSFCH candidate resources to send feedback.

[0192] It can be seen that based on the method described in Figure 3, 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. This can avoid the situation where multiple UEs occupy one PSFCH candidate resource, and enable the second UE to better distinguish the situation where UEs in the UE group receive the first PSSCH. Therefore, based on the method described in Figure 3, HARQ feedback can be properly handled when the number of PSFCH candidate resources is insufficient.

[0193] Please refer to Figure 4, which is a flow chart of an information feedback method provided in an embodiment of the present application.

[0194] 401. A second UE multicasts a first PSSCH to a UE group. The first PSSCH carries indication information indicating that HARQ feedback is enabled. Accordingly, a first UE receives the first PSSCH multicast by the second UE to the UE group. The first UE is one of the UEs in the UE group, which includes multiple UEs.

[0195] Optionally, the indication information may be included in the second-level sidelink control information, and the second-level sidelink control information is carried on the first PSSCH.

[0196] 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.

[0197] Wherein, the first parameter is obtained according to the number of UEs included in the UE group. How to obtain the first parameter according to the number of UEs included in the UE group can be referred to the introduction of the embodiment corresponding to FIG2 , which will not be repeated here.

[0198] 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 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 candidate resources. 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 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.

[0199] In one 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. 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.

[0200] 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 only the common part transmitted by the first UE on the PSFCH corresponding to the first PSSCH.

[0201] In an embodiment of the present application, when HARQ feedback is enabled, after the second UE multicasts the first PSSCH, 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 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 candidate resources. 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 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.

[0202] In one 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 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.

[0203] Accordingly, 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.

[0204] That is, although 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 less than or equal to the number of PSFCH candidate resources, the first UE can normally use Option 2 to perform HARQ feedback. 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 normally perform HARQ feedback, so that the second UE can determine the reception status of these UEs of the first PSSCH.

[0205] 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 candidate resources is 2. Since the number of UEs included in the UE group is greater than the number of PSFCH candidate resources, UE1 continues to compare the member identifier of UE1 with the number of PSFCH candidate resources. 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, 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.

[0206] 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 this 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 this PSFCH resource.

[0207] Since the number of UEs included in the UE group is greater than the number of PSFCH candidate resources, UE3 continues to compare the size of UE1'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. Correspondingly, based on the same principle, UEX does not detect the HARQ feedback information corresponding to the first PSSCH from UE3, or UEX receives only the common part transmitted by UE3 on the PSFCH corresponding to the first PSSCH.

[0208] 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. After the first UE determines to enable HARQ feedback, 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, and then sends the first PSFCH to the second UE on the PSFCH resource corresponding to the first UE.

[0209] In one 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, where 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.

[0210] Accordingly, 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.

[0211] In one 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 first UE determines a PSFCH resource corresponding to the first UE from the PSFCH candidate resources based on the member identifier of the first UE, and then sends the first PSFCH to the second UE on the PSFCH resource corresponding to the first UE.

[0212] It can be seen that based on the method described in Figure 4, 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. This can avoid the situation where multiple UEs occupy one PSFCH candidate resource, and enable the second UE to better distinguish the situation where UEs in the UE group receive the first PSSCH. Therefore, based on the method described in Figure 4, HARQ feedback can be reasonably processed when the number of PSFCH candidate resources is insufficient.

[0213] Please refer to Figure 5, which is a flow chart of an information feedback method provided in an embodiment of the present application.

[0214] 501. A 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, a first UE receives the first PSSCH multicast by the second UE to the UE group. The first UE is one of the UEs in the UE group, which includes multiple UEs.

[0215] Wherein, the first parameter is obtained according to the number of UEs included in the UE group. How to obtain the first parameter according to the number of UEs included in the UE group can be found in the introduction of the embodiment corresponding to FIG2 and will not be described in detail here.

[0216] Optionally, the indication information may be included in the second-level sidelink control information, and the second-level sidelink control information is carried on the first PSSCH.

[0217] 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.

[0218] 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.

[0219] 502. When the first parameter is greater than the number of PSFCH selectable 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.

[0220] 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.

[0221] 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.

[0222] 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.

[0223] 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 candidate resources is 2. UEX compares the number of UEs included in the UE group with the number of PSFCH candidate resources. Because the number of UEs included in the UE group is greater than the number of PSFCH candidate resources, UEX multicasts a first PSSCH to the UE group. The first PSSCH carries indication information indicating that HARQ feedback is not enabled.

[0224] 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 only the common part transmitted by UE1 on the PSFCH corresponding to the first PSSCH.

[0225] 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. Correspondingly, based on the same principle, UEX does not detect the HARQ feedback information corresponding to the first PSSCH from UE2, or UEX receives only the common part transmitted by UE2 on the PSFCH corresponding to the first PSSCH.

[0226] 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 only the common part transmitted by UE3 on the PSFCH corresponding to the first PSSCH.

[0227] That is to say, in the embodiments of the present application:

[0228] For shared spectrum, if a 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,

[0229] if HARQ 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.

[0230] As can be seen, based on the method described in Figure 5, 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 a single PSFCH candidate resource, and enabling the second UE to better distinguish between the situations in which UEs in the UE group receive the first PSSCH. Therefore, based on the method described in Figure 5, HARQ feedback can be properly processed when the number of PSFCH candidate resources is insufficient.

[0231] Please refer to Figure 6, which is a flow chart of an information feedback method provided in an embodiment of the present application.

[0232] 601. A 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, a first UE receives the first PSSCH multicast by the second UE to the UE group. The first UE is one of the UEs in the UE group, which includes multiple UEs.

[0233] Wherein, the first parameter is obtained according to the number of UEs included in the UE group. How to obtain the first parameter according to the number of UEs included in the UE group can be found in the introduction of the embodiment corresponding to FIG2 and will not be described in detail here.

[0234] Optionally, the indication information may be included in the second-level sidelink control information, and the second-level sidelink control information is carried on the first PSSCH.

[0235] 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.

[0236] 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.

[0237] 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.

[0238] That is, 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 sequence number of the first UE in the UE group is greater than the number of PSFCH candidate resources. If 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 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.

[0239] In one 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 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.

[0240] 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 only the common part transmitted by the first UE on the PSFCH corresponding to the first PSSCH.

[0241] That is, 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 candidate resources. 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 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.

[0242] In one 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 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.

[0243] Optionally, 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. After the first UE determines to enable HARQ feedback, 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.

[0244] Accordingly, 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 resource 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 resource corresponding to the first UE, and the first PSFCH carries the HARQ feedback information corresponding to the first PSSCH.

[0245] 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.

[0246] 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 candidate resources is 2. UEX compares the number of UEs included in the UE group with the number of PSFCH candidate resources. Because the number of UEs included in the UE group is greater than the number of PSFCH candidate resources, UEX multicasts the first PSSCH to the UE group. The first PSSCH carries indication information indicating that HARQ feedback is not enabled.

[0247] 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 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 this 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 this PSFCH resource.

[0248] 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 this 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 this PSFCH resource.

[0249] 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. Correspondingly, based on the same principle, UEX does not detect the HARQ feedback information corresponding to the first PSSCH from UE3, or UEX receives only the common part transmitted by UE3 on the PSFCH corresponding to the first PSSCH.

[0250] It can be seen that based on the method described in Figure 6, 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, 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. This avoids the situation where multiple UEs occupy one PSFCH candidate resource, allowing the second UE to better distinguish the situation where UEs in the UE group receive the first PSSCH. Therefore, based on the method described in Figure 6, HARQ feedback can be reasonably processed when the number of PSFCH candidate resources is insufficient.

[0251] Please refer to Figure 7, which is a flow chart of an information feedback method provided in an embodiment of the present application.

[0252] 701. A second UE multicasts a first PSSCH to a UE group. The first PSSCH carries indication information indicating that HARQ feedback is enabled. Accordingly, a first UE can receive the first PSSCH multicast by the second UE to the UE group. The first UE is one of the UEs in the UE group, which includes multiple UEs.

[0253] 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.

[0254] The first parameter is obtained based on the member identifier of the first UE, the number of UEs included in the UE group, or the arrangement number of the first UE in the UE group. How the first parameter is obtained based on the member identifier of the first UE, the number of UEs included in the UE group, or the arrangement number of the first UE in the UE group can be found in the introduction of the embodiment corresponding to Figure 2 and is not repeated here.

[0255] 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:

[0256] 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.

[0257] 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.

[0258] Optionally, the first UE does not need to compare the first parameter with the number of PSFCH candidate resources. As long as the indication information enables HARQ feedback, the first UE can directly incorporate 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 candidate resources, the PSFCH resource corresponding to the first UE can be determined in the same manner.

[0259] 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.

[0260] The second member identifier of the first UE can be understood as the 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.

[0261] 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 SL HARQ feedback Option 2 to determine the second PSFCH resource corresponding to the first UE. That is to say, 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.

[0262] In one 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 helps to further disperse the PSFCH resources multiplexed by different UEs, avoids all UEs that need to multiplex PSFCH resources from selecting the same PSFCH resource, and makes the load on different PSFCH resources more uniform.

[0263] In one possible embodiment, the second member identifier of the first UE is a fixed value predefined by the protocol. For example, the second member identifier can be 0, 1, 2, or another fixed value. 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 independently, making it easier for the second UE to distinguish between the situations in which UEs in the UE group receive the first PSSCH.

[0264] In one possible embodiment, the second member identifier of the first UE is a random value in the range [0, number of PSFCH resources to be selected - 1]. By setting the second member identifier of the first UE to a random value, PSFCH resources multiplexed by different UEs can be more dispersed, preventing all UEs that need to multiplex PSFCH resources from selecting the same PSFCH resource, thereby making the load on different PSFCH resources more uniform.

[0265] 3. The first UE randomly selects a PSFCH candidate resource from the PSFCH candidate resources.

[0266] Optionally, 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 randomly selects a PSFCH candidate resource from the PSFCH candidate resources. If the first parameter is less than or equal to the number of PSFCH candidate resources, 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, if the comparison results between the first parameter and the number of PSFCH candidate resources are different, different methods may be used to determine the PSFCH resource corresponding to the first UE.

[0267] 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.

[0268] 703. The first UE transmits a first PSFCH to the second UE on a first PSFCH resource corresponding to the first UE. The first PSFCH carries HARQ feedback information corresponding to the first PSSCH. Accordingly, if the first parameter is greater than the number of PSFCH candidate resources, the second UE may receive the first PSFCH transmitted by the first UE on the first PSFCH resource corresponding to the first UE.

[0269] 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.

[0270] In one possible embodiment, when the first parameter is greater than the number of PSFCH candidate resources, the second UE may further 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.

[0271] 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:

[0272] 1. The second UE determines, from the PSFCH candidate resources, a first PSFCH resource corresponding to the first UE based on the first member identifier of the first UE.

[0273] 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.

[0274] 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).

[0275] 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.

[0276] 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 to the first UE determining the first PSFCH resource corresponding to the first UE from the PSFCH candidate resources, which will not be repeated here.

[0277] 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.

[0278] 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; and the first UE sends the first PSFCH to the second UE on the second PSFCH resource corresponding to the first UE.

[0279] 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 incorporate 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.

[0280] 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.

[0281] 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, then the ACK value is reported to the upper layer. Otherwise, the NACK value is reported to the upper layer (report an ACK value to higher layers if the UE determines an ACK value from at least one PSFCH reception occasion from the number of PSFCH reception occasions in PSFCH resources corresponding to every identity M_"ID"of UEs and absent on all the PSFCH resources mapping to "HARQ-NACK" corresponding to every identity M_"ID"of UEs that the UE expects to receive corresponding PSSCHs as described in clause 16.3; otherwise, report a NACK value to higher layers).

[0282] 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 NACK value to higher layers (report an ACK value to higher layers if the UE determines an ACK value from at least one PSFCH reception occasion from the number of PSFCH reception occasions in PSFCH resources corresponding to every identity M_"ID" of UEs and absent on the PSFCH resources mapping to “HARQ-NACK” that the UE expects to receive corresponding PSSCHs as described in clause 16.3; report an NACK value to higher layers if the UE determines an ACK value from at least one PSFCH reception occasion from the number of PSFCH reception occasions in PSFCH resources corresponding to every identity M_"ID" of UEs and NACK value from at least one PSFCH reception occasion from the number of PSFCH reception occasions in PSFCH resources corresponding to any identity M_"ID" of UEs that the UE expects to receive corresponding PSSCHs as described in clause 16.3; otherwise, report a NACK value to higher layers).

[0283] The following introduces several possible implementation methods for HARQ feedback information and whether the common part is transmitted:

[0284] When the first parameter is greater than the number of PSFCH candidate resources and HARQ-ACK information is present:

[0285] 1. The first UE sends HARQ-ACK information + common part.

[0286] 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.

[0287] 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.

[0288] The public part is a signal sent by the UE in SL-U to occupy the channel so that it will not be occupied by other UEs or WiFi.

[0289] 2. The first UE only sends the common part.

[0290] That is, steps 703 and 704 are performed when the first parameter is greater than the number of PSFCH candidate resources and HARQ-NACK information is provided. When the first parameter is greater than the number of PSFCH candidate resources 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 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.

[0291] When the first parameter is greater than the number of PSFCH candidate resources and HARQ-NACK information is present:

[0292] 1. The first UE sends HARQ-ACK information + common part.

[0293] 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.

[0294] 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.

[0295] 2. The first UE only sends HARQ-NACK information.

[0296] 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, where 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.

[0297] As can be seen, based on the method described in Figure 7, even if the first parameter is greater than the number of PSFCH candidate resources, the first UE can still select a PSFCH resource for HARQ feedback. Compared with the existing Option 1 where all UEs occupy one PSFCH resource, this method is more differentiated. Even if multiple UEs occupy one PSFCH resource, some UEs may still occupy a PSFCH resource independently. Therefore, based on the method described in Figure 7, HARQ feedback can be properly processed when the number of PSFCH candidate resources is insufficient.

[0298] Please refer to Figure 8, which is a flow chart of an information feedback method provided in an embodiment of the present application.

[0299] 801. A second UE multicasts a first PSSCH to a UE group. The first PSSCH carries indication information indicating that HARQ feedback is enabled. Accordingly, a first UE can receive the first PSSCH multicast by the second UE to the UE group. The first UE is one of the UEs in the UE group, which includes multiple UEs.

[0300] 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 sequence 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.

[0301] Wherein, the first parameter is obtained according to the number of UEs included in the UE group. How to obtain the first parameter according to the number of UEs included in the UE group can be found in the description of the embodiment corresponding to FIG2 , which will not be repeated here.

[0302] 803. The first UE transmits a first PSFCH to the second UE on a first PSFCH resource corresponding to the first UE. The first PSFCH carries HARQ feedback information corresponding to the first PSSCH. Accordingly, if 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 transmitted by the first UE on the first PSFCH resource corresponding to the first UE.

[0303] 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, the first UE can still select a PSFCH resource for HARQ feedback 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.

[0304] In one 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 second UE may further 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.

[0305] 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 the description of the embodiment corresponding to Figure 7, which is not repeated here.

[0306] 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.

[0307] 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.

[0308] 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; and the first UE sends the first PSFCH to the second UE on the second PSFCH resource corresponding to the first UE.

[0309] 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 incorporate 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.

[0310] In one 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, please refer to the description of the embodiment corresponding to Figure 7, which is not repeated here.

[0311] In the embodiment of the present application, possible implementation methods for whether to transmit the HARQ feedback information and the common part can be found in the embodiment corresponding to FIG7 , which will not be described in detail here.

[0312] It can be seen that based on the method described in Figure 8, even if 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 can still select a PSFCH resource for HARQ feedback. Compared with the existing Option 1 where all UEs occupy one PSFCH resource, this method is more discriminatory. Even if multiple UEs occupy one PSFCH resource, some UEs may still occupy one PSFCH resource independently. Therefore, based on the method described in Figure 8, HARQ feedback can be reasonably processed when the number of PSFCH candidate resources is insufficient.

[0313] The present application provides a communication device that can be used to implement the functions of the above-mentioned first UE or second UE. The communication device can be the first UE or the second UE. The communication device includes a module or unit that corresponds one-to-one to the method / operation / step / action performed by the first UE or the second UE in the above-mentioned method embodiment. The unit can be a hardware circuit, or software, or a combination of a hardware circuit and software. Please refer to Figure 9, which shows a structural diagram of a communication device 900 of an embodiment of the present application. 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, and 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;

[0314] In one embodiment, when the communication device 900 is a first UE, wherein:

[0315] 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 multiple UEs;

[0316] The interface unit 901 is configured to, when the first parameter is greater than the number of candidate resources of the physical direct link feedback channel (PSFCH), not transmit the hybrid automatic repeat request (HARQ) feedback information corresponding to the first PSSCH to the second UE, or transmit only the common part on the PSFCH corresponding to the first PSSCH;

[0317] 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.

[0318] In a possible embodiment, the first PSSCH carries indication information, where the indication information indicates enabling HARQ feedback.

[0319] 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 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.

[0320] 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.

[0321] 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.

[0322] In a possible embodiment, the first parameter is obtained according to the number of UEs included in the UE group;

[0323] 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:

[0324] 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.

[0325] In a possible embodiment, the processing unit 902 is further 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 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 further 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.

[0326] 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.

[0327] 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.

[0328] 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 candidate resources, the indication information indicates that HARQ feedback is not enabled.

[0329] 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.

[0330] In a possible embodiment, when the first parameter is greater than the number of PSFCH resources to be selected, the interface unit 901 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.

[0331] In a possible embodiment, the processing unit 902 is further 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 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 further 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.

[0332] 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.

[0333] In a possible embodiment, the interface unit 901 receives the first PSSCH multicasted by the second UE to the UE group, including: the interface unit 901 receives the first PSSCH multicasted by the second UE to the UE group in a shared spectrum or an unlicensed spectrum.

[0334] In one embodiment, when the communication device 900 is a second UE, wherein:

[0335] 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;

[0336] 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 to cause the second UE to receive only the common part transmitted by the first UE on the PSFCH corresponding to the first PSSCH;

[0337] 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.

[0338] In a possible embodiment, the first PSSCH carries indication information, where the indication information indicates enabling HARQ feedback.

[0339] 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 resource 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 resource corresponding to the first UE, and the first PSFCH carries the HARQ feedback information corresponding to the first PSSCH.

[0340] In a possible embodiment, the first parameter is obtained according to the number of UEs included in the UE group;

[0341] 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 only the common part transmitted by the first UE on the PSFCH corresponding to the first PSSCH, including:

[0342] 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.

[0343] In a possible embodiment, the processing unit 902 is further 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 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 further 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 HARQ feedback information corresponding to the first PSSCH.

[0344] In a possible embodiment, the first parameter is obtained according to the number of UEs included in the UE group;

[0345] 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.

[0346] 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.

[0347] 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 only the common part transmitted by the first UE on the PSFCH corresponding to the first PSSCH, including:

[0348] 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.

[0349] In a possible embodiment, the processing unit 902 is further 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 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 further 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 HARQ feedback information corresponding to the first PSSCH.

[0350] 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.

[0351] In a possible embodiment, the interface unit 901 multicasts the first PSSCH to the UE group, including:

[0352] The interface unit 901 multicasts a first PSSCH to the UE group in a shared spectrum or an unlicensed spectrum.

[0353] In one embodiment, when the communication device 900 is a first UE, wherein:

[0354] An 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, and the UE group includes multiple UEs. The first PSSCH carries indication information, where the indication information indicates enabling HARQ feedback.

[0355] A processing unit 902 is configured to determine, when a first parameter is greater than the number of candidate physical direct link feedback channel (PSFCH) resources, a first PSFCH resource corresponding to the first UE from the candidate PSFCH resources; the first parameter is obtained based on a first 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;

[0356] 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.

[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] 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.

[0359] In a possible embodiment, the processing unit 902 determines the first PSFCH resource corresponding to the first UE from the PSFCH candidate resources, including:

[0360] Obtaining a second member identifier of the first UE;

[0361] 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.

[0362] 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;

[0363] Alternatively, the second member identifier of the first UE is a fixed value predefined by a protocol;

[0364] Alternatively, the second member identifier of the first UE is a random value in [0, number of PSFCH selected resources - 1].

[0365] 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;

[0366] 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.

[0367] In a possible embodiment, the first parameter is obtained according to the number of UEs included in the UE group;

[0368] 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:

[0369] 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 PSFCH resource corresponding to the first UE is determined from the PSFCH candidate resources.

[0370] In a possible embodiment, the processing unit 902 is further 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 further used to send the first PSFCH to the second UE on the second PSFCH resource corresponding to the first UE.

[0371] 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-ACK information.

[0372] 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:

[0373] 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;

[0374] 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.

[0375] 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.

[0376] 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.

[0377] In a possible embodiment, the interface unit 901 receives the first PSSCH multicasted by the second UE to the UE group, including: the interface unit 901 receives the first PSSCH multicasted by the second UE to the UE group in a shared spectrum or an unlicensed spectrum.

[0378] In one embodiment, when the communication device 900 is a second UE, wherein:

[0379] An 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 and a first UE is one of the UE group. The first PSSCH carries indication information indicating that HARQ feedback is enabled.

[0380] The processing unit 902 is configured to receive, when the first parameter is greater than the number of candidate physical direct link feedback channel (PSFCH) 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;

[0381] 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.

[0382] 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.

[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] 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.

[0385] In a possible embodiment, the processing unit 902 determines the first PSFCH resource corresponding to the first UE from the PSFCH candidate resources, including:

[0386] Obtaining a second member identifier of the first UE;

[0387] 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.

[0388] 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;

[0389] Alternatively, the second member identifier of the first UE is a fixed value predefined by a protocol.

[0390] In a possible embodiment, the first parameter is obtained based on the first 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 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.

[0391] In a possible embodiment, the first parameter is obtained according to the number of UEs included in the UE group;

[0392] 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:

[0393] 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 sent by the first UE is received on the first PSFCH resource corresponding to the first UE.

[0394] In a possible embodiment, the processing unit 902 is further 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 further used to receive the first PSFCH sent by the first UE on the first PSFCH resource corresponding to the first UE.

[0395] 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.

[0396] 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:

[0397] 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;

[0398] The interface unit 901 is further configured 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.

[0399] 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 selectable resources and the HARQ feedback information is HARQ-NACK information.

[0400] 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.

[0401] 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.

[0402] In a possible embodiment, the interface unit 901 multicasts the first PSSCH to the UE group, including:

[0403] The interface unit 901 multicasts a first PSSCH to the UE group in a shared spectrum or an unlicensed spectrum.

[0404] As shown in FIG10 , a communication device 1000 provided in an embodiment of the present application is configured to implement the functions of the first UE or second UE described above. 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 chip within the communication device. The chip system may consist of a chip alone or may include a chip and other discrete components.

[0405] The communication device 1000 includes at least one processor 1010 for implementing 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 for implementing 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 may be a transceiver, a circuit, a bus, a module, or other types of communication interfaces for communicating with other devices via 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.

[0406] 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 embodiments 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 the 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.

[0407] The specific connection medium between the communication interface 1020, processor 1010, and memory 1030 is not limited in the embodiments of the present application. In Figure 10, the embodiment of the present application shows that the memory 1030, processor 1010, and communication interface 1020 are connected via a bus. The bus is represented by a bold line in Figure 10. The connection method between other components is only for schematic illustration and is not limiting. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, only one bold line is used in Figure 10, but this does not mean that there is only one bus or one type of bus.

[0408] 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.

[0409] It should be noted that the above-mentioned communication interface 1020 can be used to execute the functions of the above-mentioned interface unit 901, and the above-mentioned processor 1010 can be used to execute the functions of the above-mentioned processing unit 902, which will not be repeated here.

[0410] 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.

[0411] It is understood that the processor in the embodiments of the present application may be a central processing unit (CPU), or may be 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.

[0412] 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, which can be stored in random access memory (RAM), flash memory, read-only memory (ROM), programmable read-only memory (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 an integral part 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.

[0413] 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 via 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).

[0414] In the various embodiments of the present application, unless otherwise specified or there is a logical conflict, the terms and / or descriptions between different embodiments are consistent and can be referenced by each other. The technical features in different embodiments can be combined to form new embodiments according to their inherent logical relationships.

[0415] It is understood that the various numbers used in the embodiments of this application are merely for ease of description and are not intended to limit the scope of the embodiments of this application. The order of the sequence numbers of the above-mentioned processes does not necessarily imply a specific order of execution; the order of execution of the processes should be determined by their functions and inherent logic.

[0416] 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.

[0417] 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 performed by the first UE or the second UE in the above method embodiment is implemented.

[0418] The present application also provides a communication system including a first UE and a second UE, wherein the first UE is configured to execute the method executed by the first UE in the above method embodiment, and the second UE is configured to execute the method executed by the second UE in the above method embodiment.

[0419] 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 this application is not limited by the order of the actions described, because according to this 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 this application.

[0420] The descriptions of the various embodiments provided in this application can refer to each other. The descriptions of each embodiment have their own focus. For parts not described in detail in a particular embodiment, please refer to the relevant descriptions of other embodiments. For the convenience and brevity of description, for example, the functions and execution steps of the various devices and equipment provided in the embodiments of this application can refer to the relevant descriptions of the method embodiments of this application. The various method embodiments and the various device embodiments can also refer to, be combined with, or quote each other.

[0421] 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 them. 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 make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions 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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