Patent ID: 8050247

Claim:
A retransmission method performed in a transmitter of a mobile communication system supporting a Hybrid Automatic Retransmission reQuest (HARQ) operation and an Automatic Retransmission request (ARQ) operation for retransmission of a packet, the method comprising: transmitting, by an HARQ entity, an HARQ packet having at least one ARQ packet in the HARQ packet to a receiver; and if the HARQ packet fails in transmission, transmitting, by the HARQ entity, a local NACK signal indicating transmission fail of the ARQ packet to a corresponding ARQ entity, wherein the HARQ entity maintains an identifier of a corresponding ARQ entity where the ARQ packet is generated and a sequence number of the corresponding ARQ packet, as information of the ARQ packet, during transmission of the HARQ packet, and wherein the HARQ entity receives information to determine if the HARQ packet was properly transmitted.