Patent ID: 8036101

Claim:
A method for retransmitting high-speed packet data in a transmission apparatus of a mobile communication system that simultaneously performs an Automatic Retransmission reQuest (ARQ) that retransmits an ARQ packet reconfigured by allocating a sequence number to data delivered from an upper layer, and a Hybrid Automatic Retransmission reQuest (HARQ) that multiplexes a plurality of ARQ packets into one HARQ packet and performs repeated retransmission on the HARQ packet within a maximum retransmission limit value, the method comprising: checking, by a transmitting HARQ entity, a missing ARQ packet and sending a Negative Acknowledgement (NACK) for the missing ARQ packet to a transmitting ARQ entity; receiving, by the transmitting ARQ entity, an Acknowledged (ACK) for ARQ packets from a receiving ARQ entity; and detecting, by the transmitting ARQ entity, at least one missing ARQ packet according to the NACK and the ACK, configuring a retransmission packet with the detected ARQ packet, and retransmitting the retransmission packet.