Patent ID: 8750198

Claim:
A method of requiring an uplink resource at a mobile station in a wireless communication system including a relay station maintaining connection with the mobile station, the method comprising: transmitting an uplink resource allocation request for transmitting data to the relay station; and starting a timer for retransmitting the uplink resource allocation request when the request is transmitted to the relay station, receiving an uplink resource allocation delay message indicating that the relay station cannot allocate an uplink resource to the mobile station within a period of the timer for which the mobile station is configured to wait for a response to the uplink resource allocation request, from the relay station, wherein, if the mobile station receives the uplink resource allocation delay message, the mobile station is not configured to retransmit the uplink resource allocation request until receiving the response to the uplink resource allocation request from the relay station, regardless of termination of the timer, wherein the uplink resource allocation delay message is received from the relay station if the relay station cannot allocate the uplink resource from a base station or a buffer of the relay station for allocating the uplink resource is full.