FIELD: physics, communications.
SUBSTANCE: invention relates to means of feeding back and receiving acknowledgment (ACK) information of semi-persistent scheduling (SPS) data packets. An uplink/downlink assignment index (UL DAI) is received from a base station (BS), wherein the UL DAI indicates a number (N) of downlink data packets. ACK/NAK of k SPS data packets of the downlink data packets are mapped to positions from the (N−k+1)th ACK/NAK to the Nth ACK/NAK, and N ACK/NAK are fed back to the BS.
EFFECT: reduced retransmission.
32 cl, 8 dwg
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