Section: 5.15.1.2.1 Sidelink HARQ Entity
Content: There is one Sidelink HARQ Entity at the MAC entity for transmission on SL-DCH, which maintains one Sidelink process for each MAC PDU. For each subframe of the SL-DCH the Sidelink HARQ Entity shall: - if a grant and a MAC PDU has been delivered for this subframe to the Sidelink HARQ Entity: - deliver the MAC PDU and the grant to the Sidelink process; - instruct the Sidelink process to trigger a new transmission. - else, if this subframe corresponds to retransmission opportunity for the Sidelink process: - instruct the Sidelink process to trigger a retransmission.