In the above-described embodiment, a case in which the PSFCH transmission of the receiving UE is disabled for the TB or the specific period of the CG corresponding to the HARQ-ACK feedback to be reported by the transmitting UE to the base station may be a case in which the HARQ-ACK feedback is disabled by an upper layer (e.g., MAC layer) of the transmitting UE with respect to a packet transmitted by the transmitting UE to the receiving UE at the corresponding time. For example, a case in which the PSFCH transmission of the receiving UE is disabled for the TB or the specific period of the CG corresponding to the HARQ-ACK feedback to be reported by the transmitting UE to the base station may be a case in which PSFCH transmission of the receiving UE or PSFCH reception of the transmitting UE is canceled due to congestion control, etc.