Method and apparatus for tracking location of user equipment by using integrated GPS and TDOA scheme
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United States of America Patent
Stats
-
Nov 4, 2008
Grant Date -
Oct 19, 2006
app pub date -
Nov 10, 2005
filing date -
Nov 11, 2004
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and an apparatus for tracking a location of a UE by using an integrated GPS and TDOA scheme in a mobile communication network are provided. A GPS position solution of the UE is obtained using GPS code information. TDOA position solutions are obtained using pilot signal transmission times of BSs and pilot signal reception times of the UE, and an average value of the TDOA position solutions is calculated. The GPS position solution is subtracted from the average to obtain a position error value, and an iterative method using a least square method is performed for the position error value to correct the position error. The corrected position error value is added to the average value of the TDOA position solutions to obtain a more precise position solution.
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