For example, if the PSFCH resource is not configured for the resource pool, and/or if 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, the reference point related to the PUCCH transmission timing may be a time when the transmitting UE transmits a PSCCH and/or a PSSCH to the receiving UE. Specifically, for example, the reference point related to the PUCCH transmission timing may be a time when the transmitting UE transmits the last PSCCH and/or the last PSSCH to the receiving UE within the specific period. For example, the reference point related to the PUCCH transmission timing may be a time when the transmitting UE transmits the last PSCCH and/or the last PSSCH among the PSSCH resource bundle to the receiving UE.
For example, if the PSFCH resource is not configured for the resource pool, and/or if 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, the reference point related to the PUCCH transmission timing may be a time when the base station transmits the corresponding PDCCH to the transmitting UE. For example, if the PSFCH resource is not configured for the resource pool, and/or if 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, the reference point related to the PUCCH transmission timing may be a time when the transmitting UE receives the corresponding PDCCH from the base station.