Message transmission in wireless access system

A mobile station for transmitting and receiving messages to initiate an idle mode of the mobile station in a wireless access system, the mobile station comprising means for:

• transmitting a de-registration request (DREG-REQ) message for requesting the idle mode initiation to a base station;
• setting a de-registration request retransmission count to a predetermined value;
• enabling a de-registration command standby timer;
• and
• receiving a de-registration command (DREG-CMD) message acknowledging the idle mode initiation from the base station,
• wherein the mobile station retransmits the de-registration request message to the base station when the de-registration command standby timer is expired before receiving the de-registration command message from the base station and the de-registration request retransmission count is not exhausted,
• wherein management resources of the mobile station are released when a management resource holding timer of the base station expires.

A method for transmitting and receiving messages to initiate an idle mode of a mobile station in a wireless access system, the method comprising:

• transmitting, by the mobile station to a base station, a de-registration request (DREG-REQ) message requesting the idle mode initiation;
• setting a de-registration request retransmission count to a predetermined value;
• enabling a de-registration command standby timer awaiting a de-registration command (DREG-CMD) message from the base station;
• and
• retransmitting the de-registration request message to the base station when the de-registration command standby timer is expired before receiving the de-registration command message and the de-registration request retransmission count is not exhausted,
• wherein the de-registration command message acknowledges the idle mode initiation of the mobile station,
• wherein management resources of the mobile station are released when a management resource holding timer of the base station expires.