| CPC H04L 1/1861 (2013.01) [H04W 72/20 (2023.01); H04W 72/56 (2023.01)] | 14 Claims |

|
1. A method performed by a first user equipment (UE) in a wireless communication system, the method comprising:
receiving first sidelink control information (SCI) via a physical sidelink control channel (PSCCH);
receiving second SCI via a physical sidelink shared channel (PSSCH);
in case that indication information in the second SCI indicates groupcast transmission using first hybrid automatic repeat request (HARQ) feedback mode, transmitting HARQ feedback information including only NACK via a physical sidelink feedback channel (PSFCH); and
in case that the indication information in the second SCI indicates groupcast transmission using second HARQ feedback mode, transmitting HARQ feedback information including ACK or NACK via the PSFCH.
|