Inventors:
Sven Svensson - San Diego CA, US
Erik Colban - San Diego CA, US
Martin Renschler - San Diego CA, US
Ralf Keller - Wurselen, DE
George Foti - Dollard Des Ormeaux, CA
International Classification:
H04Q 7/00
Abstract:
A Handoff (HO) Function facilitates the handoff of a hybrid Access Terminal/Mobile Terminal (AT/MT) from a packet data wireless network to a circuit switched wireless network, while the AT/MT is engaged in a call with another party through an IMS network. The HO Function subscribes to dialogue events for the AT/MT, and is thus aware of all relative network parameters. When a handoff is required, the HO Function generates all signaling necessary to include into the IMS network user plane, a media gateway connected to the circuit switched MSC, and to redirect the other party to the media gateway. The HO Function then generates signaling to hand the AT/MT off to the circuit switched network, which then communicates through the MSC to the media gateway. The home network of the AT/MT need not be involved in, or even aware of, the handoff.