METHOD AND APPARATUS FOR PACKET RETRANSMISSION IN A MOBILE COMMUNICATION SYSTEM

摘要

The present invention relates to a packet retransmission method for a terminal that accesses a base station through a contention-based access system, wherein the method comprises the following steps: transmitting an uplink packet to the base station; when the base station has failed to decode the uplink packet, receiving a retransmission request message transmitted by the base station; and initiating radio link control layer retransmission upon receipt of the retransmission request message. According to the present invention, the terminal, which uses a contention-based access system, initiates RLC retransmission upon receipt of HARQ NACK from the base station, and thus RLC retransmission can be immediately performed without having to wait for HARQ RTT, which otherwise might be needed in conventional HARQ retransmission systems, thereby preventing delays in HARQ retransmission.