Patent ID: 11870586
Assignee: LG ELECTRONICS INC.
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A method for performing, by a first device, groupcast communication with one or more devices in a group, the method comprising:
determining a number of physical sidelink feedback channel (PSFCH) resources related to a physical sidelink shared channel (PSSCH) resource;
determining that a size of the group is greater than the number of PSFCH resources by comparing the number of PSFCH resources and the size of the group;
selecting, based on the determination that the size of the group is greater than the number of PSFCH resources, negative-only hybrid automatic repeat request (HARQ) feedback among the negative-only HARQ feedback and positive-negative HARQ feedback;
transmitting, to the one or more devices, information regarding the negative-only HARQ feedback;
transmitting, to the one or more devices, data based on the PSSCH resource; and
receiving negative acknowledgement (NACK) from at least one second device, based on failure of decoding of the data by the at least one second device among the one or more devices.