Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Patent
1995-06-07
1998-03-24
Eisenzopf, Reinhard J.
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
455524, 455 676, 342451, 3644491, G01S 302, H04B 726
Patent
active
057323542
ABSTRACT:
A method and apparatus for determining the location of a mobile telephone within the serving area of a mobile telephone system are disclosed. A mobile switching center analyzes the calling mobile telephone number and called telephone number to determine if a location function is required. Upon initiation of the location function by the mobile switching center, a mobile location module calculates a location estimate of the mobile telephone. The mobile location module receives a list of signal strengths received by the mobile telephone from cell site antennas within the serving area. The distance between the mobile telephone and a plurality of cell site antennas is calculated using a technique which reduces the error component of the calculated distances. These reduced error distances are used to geometrically determine an estimate of the location area within the sewing area of a mobile telephone system.
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AT&T Wireless Services Inc.
Eisenzopf Reinhard J.
Kincaid Lester G.
Weinick Jeffrey M.
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