Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Reexamination Certificate
2007-12-18
2007-12-18
Cumming, William D. (Department: 2617)
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
C370S331000
Reexamination Certificate
active
11420850
ABSTRACT:
A method for handing off a call between networks includes monitoring a quality of a first link between a mobile station and a wireless local area network (WLAN) when the mobile station is actively connected with the WLAN on a call and monitoring a quality of a second link between the mobile station and a cellular network when the mobile station is actively connected with the WLAN on the call. The method also includes handing off the call from the WLAN to the cellular network when the quality of the first link is less than a handoff trigger threshold for a drop count duration and when the quality of the second link is greater than a minimum cellular link quality threshold.
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Jagadeesan Ramanathan T.
Nguyen Bich Tu
Baker & Botts L.L.P.
Cisco Technology Inc.
Cumming William D.
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