Method and an apparatus for positioning system assisted cellular radiotelephone handoff and dropoff
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United States of America Patent
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-
Dec 4, 2001
Grant Date -
N/A
app pub date -
Feb 19, 1998
filing date -
Feb 19, 1998
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A method and an apparatus is provided for acquiring satellite signals to establish the exact spatial position of a cellular radiotelephone, in order to perform a timely dropoff or smooth handoff to another base station or frequency. The cellular radiotelephone is equipped with its own positioning system which uses satellite data to determine its spatial position. The communication system is preferably a Code Division Multiple Access (CDMA) system, and the positioning system is preferably a Global Positioning System (GPS). The method of the present invention may be used to determine the base station closest to the cellular radiotelephone. In the alternative, it may be used to compute a distance between the cellular radiotelephone and a location where the quality level of the cellular radiotelephone communication signal is predicted to be less than the predetermined value, and to determine from the computed distance whether the cellular radiotelephone should be handed off.
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