HARQ feedback and retransmission mechanism for sidelink transmission

An apparatus, comprising:

• at least one processor;
• and
• a non-transitory computer readable storage medium storing programming, the programming including instructions that, when executed by the at least one processor, cause the apparatus perform operations, the operations comprising:
• receiving, from a base station, a configuration indicating resources for a first set of sidelink (SL) transmissions from the apparatus to a second apparatus, the first set of SL transmissions including an initial SL transmission and a plurality of SL retransmissions;
• after the receiving the configuration, transmitting, to the second apparatus, at least one SL transmission of the first set of SL transmissions from a first apparatus;
• before transmitting a last SL retransmission of the plurality of SL retransmissions, receiving, from the second apparatus, an acknowledgement (ACK) for the at least one SL transmission;
• and
• terminating transmission of the first set of SL transmissions in response to receiving the ACK by refraining from transmitting at least the last SL retransmission of the plurality of SL retransmissions.