Hand-off technique for a wireless network

Details Hand-off technique for a wireless network Hand-off technique for a wireless network

2007-05-08

2007-05-08

Ferguson, Keith (Department: 2617)

Telecommunications

Radiotelephone system

Zoned or cellular telephone system

C455S438000, C455S439000, C455S440000, C455S422100, C455S403000, C370S331000

Reexamination Certificate

active

11026587

ABSTRACT:
A technique that relates to use of a known messaging sequence, e.g., ISANSWER messaging in the IS-41 protocol, in a heretofore unknown manner to improve hand-off procedures that may be established between a serving (anchor or intermediate) mobile switching center and a target (or border) mobile switching center is provided. Specifically, the ISANSWER message is selectively sent from the serving mobile switching center to the target mobile switching center during the hand-off process. The transmission of the ISANSWER message in this manner allows the target mobile switching center to terminate ring back to a caller when the mobile station answers the call after the handoff has been started, but while the mobile station is still within a cell area of the serving mobile switching center.

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“Cellular Radiotelecommunications Intersystem Operations;” 3rdGeneration Partnership Project 2 N/S0005.0; Version 1; XP-002379415; pp. 1, 2-57 to 2-60; Jul. 1997.
“IS-41 for Mobility Management;” James I. Yu; IEEE; New York, NY; XP-000494916; pp. 158-162; Sep. 29, 1992.
European Search Report.

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