Voice over IP mobility in IP/cellular networks interworking

Details Voice over IP mobility in IP/cellular networks interworking Voice over IP mobility in IP/cellular networks interworking

2005-09-06

2005-09-06

Nguyen, Brian (Department: 2661)

Multiplex communications

Pathfinding or routing

Combined circuit switching and packet switching

C370S338000, C455S432100

Reexamination Certificate

active

06940848

ABSTRACT:
A mobile host is connected to a communication terminal through a first mobile switching center of a cellular network, a first gateway at a near end of the Internet, and a second gateway at a far end of the Internet. When the mobile host roams from an area controlled by the first mobile switching center to an area controlled by a second mobile switching center, a comparison is done between the first gateway connected to the first mobile switching center and a third gateway that is connected to the second mobile switching center. If the third gateway and the first gateway are different, the third gateway invokes a call transfer procedure to the first gateway to establish a connection between the second gateway and the third gateway, and release a connection between the first gateway and the second gateway.

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Wanjiun Liao, Jen-Chi Liu, VolP Mobility in IP/Cellular Network Internetworking, Apr. 2000, pp. 2-8, IEEE Communications Magazine.

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