Patent ID: 7283495

Claim:
A method for reconnecting an exchange of packet data between a mobile station and an external packet network by storing dormant state information of mobile stations in a dormant state where no packet data is exchanged with the external packet network, in a centralized database connected to a packet data switch, and updating the dormant state information stored in the centralized database in association with the mobile station when the mobile station in the dormant state moves to a target BSC adjacent to a source BSC in a wireless packet data system including a packet data switch node (PDSN) for connecting the external packet network to the mobile stations through the packet data switch and the source BSC connected to the packet data switch, the method comprising the steps of: upon receipt of a termination call requesting termination of packet data from the external packet network, transmitting from the source BSC to the centralized database a query message for determining a location of the mobile station for the termination call; upon receipt of the query message, searching dormant state information stored in association with the mobile station in the centralized database and transmitting the searched dormant state information to the source BSC using a location information message; upon receipt of the location information message, transmitting from the source BSC to the target BSC where the mobile station is located a paging request message for requesting paging of the mobile station; upon receipt of the paging request message, paging by the target BSC the mobile station and transmitting a page response acknowledge message acknowledging the paging to the source BSC when the mobile station responds to the paging; upon receipt of the paging response acknowledge message, transmitting from the source BSC to the target BSC a packet call connection message requesting connection of the packet data, and thus connecting the source BSC to the target BSC through the packet data switch.