Patent ID: 8380227

Claim:
A communication system for controlling idle mode activity, the communication system comprising a mobile subscriber station, a plurality of base stations belonging to a same paging group and a paging controller, the communication system further comprising: the mobile subscriber station for: transmitting a first request message to a serving base station in order to enter idle mode; receiving a response message from the serving base station and entering idle mode, the response message including paging information that includes information related to at least paging grouping identification, paging cycle, or paging offset; receiving a paging message during a specified time interval from one of the plurality of base stations; and performing a power down location update by transmitting a ranging request message comprising a power down indicator to enable the paging controller to update the exact status of the mobile subscriber station, delete all information for the mobile subscriber station and discontinue idle mode paging control for the mobile subscriber station; and the paging controller for: determining whether the power down location update is successful; releasing all idle mode retaining information related to the mobile subscriber station if the power down location update is successful; performing a power availability check using location update polling if the power down location update is unsuccessful; and deleting all the idle mode retaining information if the mobile subscriber station does not answer for the location update polling before a paging retry count is reached.