Patent ID: 7590421

Claim:
A method of supporting a mobile station that is in an idle mode in a wireless communication system using a paging controller, the method comprising: receiving from a first base station an idle mode response command to enter the idle mode; entering an idle mode by a mobile station; receiving a paging command from at least one of the plurality of base stations in a paging group, the paging command comprising a paging command action code associated with performing ranging while the mobile station is in the idle mode, wherein the paging command is generated from the at least one of the plurality of base stations in response to a paging announcement, wherein the paging announcement comprises a paging announcement action code set by the paging controller to instruct the mobile station to perform network re-entry when there is downlink traffic data to be delivered to the mobile station, and wherein the paging command action code is determined in accordance with the paging announcement action code; and terminating the idle mode; transmitting a ranging request message for network re-entry to a second base station in the paging group, when the paging command action code indicates that the mobile terminal shall enter the network; receiving a raging response message from the second base station; and receiving downlink traffic data from the second base station, wherein the downlink traffic data have been delivered from the first base station to the second base station according to an instruction of the paging controller.