Cellular telephone system that uses position of a mobile unit to make call management decisions
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United States of America Patent
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Sep 29, 1998
Issued Date -
N/A
app pub date -
Nov 22, 1995
filing date -
Dec 26, 1991
priority date (Note) -
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status (Latency Note)
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Abstract
A cellular telephone system (20) includes a plurality of cell sites (14) and a mobile telephone switching office (MTSO,12). Call management, including selection of a cell site most appropriate for a call associated with a mobile unit (M,M') are made based on the geographic location of the mobile unit as opposed to the strength of the signal associated with the call. The geographic location of the mobile unit is precisely determined using triangulation, a NAVSTAR global positioning system, or its equivalent. Each mobile unit includes a GPS receiver (24) that receives information from a geostationary satellite (22) to determine the precise location of the mobile unit. This position information is relayed to the cell site initially managing the mobile unit, and the mobile unit is handed off to a cell site that is most appropriate for the call. Initial selection of an entrance cell site is made based on signal strength, but further call management decisions are made based on location of the mobile unit.
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