Patent ID: 8670400

Claim:
A method for acquiring an address of a Serving General Radio Packet Service support node (SGSN) comprising: a Policy and Charging Enforcement Function (PCEF) entity providing a SGSN change event trigger to a Policy and Charging Rules Function (PCRF) entity; and the PCRF entity reporting a SGSN change event and a new address of the SGSN to the PCEF entity after receiving the SGSN change event trigger; wherein the step of the PCRF entity reporting the SGSN change event and the new address of the SGSN to the PCEF entity after receiving the SGSN change event trigger comprises: the PCRF entity subscribing the SGSN change event trigger to a Bearer Binding and Event Report Function (BBERF) entity after receiving the SGSN change event trigger from the PCEF, the BBERF entity installing the SGSN change event trigger, and reporting the SGSN change event and the new address of the SGSN to the PCRF entity when the BBERF entity detects the SGSN change event, and the PCRF entity reporting the SGSN change event and new address of the SGSN to the PCEF.