Abstract: A method for controlling operation modes of a medium access control layer by a mobile subscriber station in a broadband wireless access communication system including the mobile subscriber station and a serving base station providing service to the mobile subscriber station is provided. The method includes the steps of: mode-transiting into an idle mode when there is no data transmission between the serving base station and the mobile subscriber station during a predetermined first time interval in an awake mode; detecting movement of the mobile subscriber station in the idle mode into another paging zone covering a target base station, which is different from a paging zone covering the serving base station; and mode-transiting into the awake mode and performing location update together with the target base station when the movement of the mobile subscriber station is detected.

Abstract: A system and method for fast network re-entry in a broadband wireless access communication system. A mobile station transmits a first message requiring fast network re-entry to a base station and performs the fast network re-entry together with the base station when receiving a second message approving the fast network re-entry from the base station. The base station receives the first message, authenticates the first message using final session information of the mobile station that is previously stored in the base station, transmits the second message to the mobile station when succeeding in authentication of the first message, and performs the fast network re-entry together with the mobile station.

Abstract: A method for delivering a received frame packet, to be transmitted from a packet data service node to a mobile station in a dormant state by a packet control function in a mobile communication system capable of providing data service or Push-To-Talk (PTT) service to the mobile station, via a base station connected to the packet control function. The packet control function delivers the received packet data and paging data to the base station where the mobile station in the dormant state is located. The base station forms the received packet data into an SDB (Short Data Burst), includes the SDB in a DBM (Data Burst Message) message, and transmits the DBM message to the mobile station if an analysis result of the received paging data indicates that the mobile station in the dormant state has requested fast packet paging and the base station can currently provide the fast packet paging.