Patent ID: 8279797

Claim:
In a communication system infrastructure including a circuit-switched network and an overlain packet data network, a method of cross-paging a mobile station between networks where a paging source node in the packet data network in a first location area does not connect with a mobile switching center of the circuit-switched network that is serving the mobile station in a second location area, comprising the steps of: providing the mobile station being on a circuit-switched communication in the first location area served by the circuit-switched network, with the mobile station maintaining a packet data session on the packet data network in the first location area; the mobile station moving to a second location area served by the circuit-switched network, such that the location of the mobile station with respect to the circuit-switched network becomes unknown by the packet data network; attempting to page the mobile station by the packet data network in the first location area via the circuit-switched network and failing; informing the packet data network of a change in location areas for the mobile station by the circuit-switched network by providing an identifier for the mobile switching center serving the mobile station in the second location area; and sending a paging request from the paging source node in the first location area on an interface between nodes of the packet data network to a target packet data node under the domain of the mobile switching center identified in the informing step.