Patent ID: 7415274

Claim:
A method, comprising: receiving a registration request in a radio access network; in the radio access network, keeping track of core networks available for serving the registration request, wherein each core network belongs to a plurality of core networks; selecting a core network for the registration request, the selected core network belonging to the available core networks; forwarding the registration request to the selected core network; and monitoring a network-originated event that indicates that the selected core network is currently the only available core network, wherein in the radio access network, determining whether at least one predetermined criterion is fulfilled, wherein a fulfillment of the at least one predetermined criterion indicates that the event has occurred and therefore routing of the registration request to another core network is no longer allowed; and in response to the at least one predetermined criterion being fulfilled, notifying the selected core network from the radio access network that the registration request can only be served by the selected core network, wherein the radio access network is configured to control the selected core network, and the selected core network is forced to serve the registration request upon detection of the event.