Patent ID: 8320291

Claim:
A User Equipment (UE) for use in a radio communication system, the UE comprising means for switching between communication via a Packet Switched Long Term Evolution (LTE) network and a System Architecture Evolution (SAE) network and communication via a Circuit Switched (CS) network, wherein a first radio access technology supported by the CS network is different than a second radio access technology supported by the Packet Switched Long Term Evolution (LTE) network, and wherein the LTE network is configured to use an LTE positioning format to define UE locations and the CS network is configured to use a CS positioning format to define UE locations, the UE further comprising: means for receiving positioning information in the CS positioning format while camped on the LTE network, wherein the positioning information indicates one or more Location Areas (LAs) served by the CS network means for storing the positioning information received in the CS positioning format; means for receiving a paging request regarding the incoming CS call from the CS network via the LTE radio access network in accordance with the second radio access technology: and means for responding to the paging request in the CS network using the positioning information that was received in the CS positioning format while the UE was camped on the LTE network, wherein responding to the paging request comprises responding to the paging request using the first radio access technology supported by the CS radio access network.