CPC H04L 1/1812 (2013.01) [H04L 5/0053 (2013.01); H04W 4/08 (2013.01); H04W 52/327 (2013.01); H04W 72/0446 (2013.01); H04W 72/20 (2023.01); H04W 92/18 (2013.01)] | 20 Claims |
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;
selecting negative-only hybrid automatic repeat request (HARQ) feedback, from among the negative-only HARQ feedback and positive-negative HARQ feedback, based on a size of the group being greater than the number of PSFCH resources;
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,
wherein, based on transmitting the information regarding the negative-only HARQ feedback through sidelink control information (SCI) related to initial transmission of the data, the first device is not allowed to transmit information regarding the positive-negative HARQ feedback through SCI related to retransmission of the data.
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