Patent ID: 7894346

Claim:
A method for supporting an idle mode operation efficiently in a wireless access system, the method comprising: transmitting, from a base station to a mobile station, a de-registration command (DREG-CMD) message to initiate the idle mode in an unsolicited manner; enabling, by the base station, a de-registration response standby timer for waiting for a de-registration request (DREG-REQ) message with a de-registration request code from the mobile station in response to the DREG-CMD message, wherein the de-registration request code indicates a response for the unsolicited DREG-CMD message; setting, by the base station, a de-registration command count; and enabling, by the base station, a management resource holding timer for maintaining management resources after transmitting the DREG-CMD message to the mobile station, wherein the base station retransmits the de-registration command message when the de-registration response standby timer expires before the base station receives the de-registration request (DREG-REQ) message and the de-registration command count is not exhausted.