System and method for IP handoff

Details System and method for IP handoff System and method for IP handoff

2007-07-17

2007-07-17

Nguyen, Tony T. (Department: 2618)

Telecommunications

Radiotelephone system

Zoned or cellular telephone system

C455S436000, C455S445000, C370S352000, C370S432000

Reexamination Certificate

active

10815443

ABSTRACT:
A seamless vertical handoff method allows the network applications and connections on a mobile node to continue without disruption as it moves within a wireless overlay network that comprises multiple possibly overlapping layers of wireless networks (e.g., a WLAN and a WWAN) with different underlying technologies, providing mobile roaming capabilities. The method comprises a WLAN access point signal strength monitor for determining when to switch between WLAN and WWAN, and a network connection migration scheme that can move an active network connection from a wireless link of one technology to another wireless link of a different technology in a way that is transparent to the user, the remote end of the network connection, and the operator of the WWAN carrier.

REFERENCES:
patent: 6721297 (2004-04-01), Korus et al.
patent: 7023828 (2006-04-01), Korus et al.

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