Method of DCR operation in a broadband wireless communication system

A method of a DCR (deregistration with content retention) mode operation of a base station in a broadband wireless access system, the method comprising:

• receiving a first message including a first code indicating a DCR mode entry request from a mobile station;
• determining whether to allow the entry request;
• if the entry request is allowed, delivering a context of the mobile station to a prescribed network entity;
• and
• transmitting a second message including a second code indicating an allowance of the entry request to the mobile station.

A mobile station which operates in a broadband wireless access system, the mobile station comprising:

• a processor;
• and
• a radio communication (RF) module configured to transceive a radio signal externally under the control of the processor,
• wherein the processor controls the wireless communication module to transmit a first message including a first code indicating a DCR mode entry request to a base station and wherein when a second message including a second code indicating whether to allow the entry request is received from the base station, if the second code indicates an allowance of the entry request as a result of determining whether to allow the entry request, the processor controls to operate in the DCR mode while a preset timer is valid.