Patent ID: 7725796

Claim:
A method for supporting a hybrid automatic retransmission request (HARQ) scheme at a mobile station in an orthogonal frequency division multiplexing access system, the method comprising: receiving a MAP message from a base station, the MAP message comprising first location information indicating a location of a downlink data region on which a downlink data burst is to be received and second location information used for identifying a location of an ACK/NACK signal slot on which an ACK or NACK signal is to be transmitted in response to the downlink data burst, the ACK/NACK signal slot being located within an ACK/NACK region, which is an uplink region allocated by the base station; and transmitting the ACK or NACK signal on the ACK/NACK signal slot based on the second location information in response to the downlink data burst received on the downlink data region indicated by the first location information.