Patent ID: 8774803

Claim:
A method of controlling a transition of a terminal to an idle mode by a base station in a wideband wireless communication system, the method comprising: transmitting an unsolicited deregistration response message to the terminal, the unsolicited deregistration response message including a MAC control extended header (MCEH) in which a poll bit for reporting whether or not a message has been received is set, an action code for instructing the terminal to transmit a deregistration request message for a transition to an idle mode, and the deregistration request message transmission time information; receiving the deregistration request message including a deregistration request code for requesting a transition to an idle mode from the terminal; and determining whether or not response information with respect to the poll bit is included in a MAC control message ACK extended header (MAEH) of the received deregistration request message; transmitting, to the terminal, a first deregistration response message including a first action code which permits the terminal to transit into the idle mode according to an unsolicited deregistration mode, when the response information is included in the MAEH of the received deregistration request message; and transmitting, to the terminal, a second deregistration response message including a second action code which permits the terminal to transit into the idle mode according to a solicited deregistration mode, when the response information is not included in the MAEH of the received deregistration request message.