Method and apparatus for transmitting and receiving sidelink harq feedback information

A receiving user equipment (UE) for transmitting hybrid automatic repeat request (HARQ) feedback information for sidelink, the receiving UE comprising:

• a receiver configured
• to receive, through a higher layer signaling, sidelink configuration information for a sidelink resource pool,
• to receive, through sidelink control information (SCI), scheduling information for a physical sidelink shared channel (PSSCH) and information indicating whether to transmit the HARQ feedback information, and
• to receive, through the PSSCH, sidelink data from a transmitting UE;
• and
• a transmitter configured to transmit, through a physical sidelink feedback channel (PSFCH), the HARQ feedback information using the sidelink resource pool,
• wherein the HARQ feedback information is transmitted based on the information indicating whether to transmit the HARQ feedback information, and
• wherein the HARQ feedback information is transmitted further based on
• i) a sequence associated with the sidelink resource pool and applied to a cyclic shift, and
• ii) information of a timing gap between a reception of the PSSCH and a transmission of the PSFCH, the timing gap information being received through the higher layer signaling,
• wherein the cyclic shift has a value based on
• an identity of the receiving UE that is indicated by the higher layer signaling,
• an identity of the transmitting UE that is included in the scheduling information of the SCI, the SCI provided to the receiving UE from the transmitting UE, and
• a value of the HARQ feedback, information that is transmitted in response to the PSSCH, and
• wherein, in determining the timing gap information, the reception of the PSSCH includes the receiving of the sidelink data from the transmitting UE and the transmission of the PSFCH is performed in response to the PSSCH reception.