Method of locating a mobile phone by measuring the distance between the phone and a base station in a cellular mobile telephone system
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United States of America Patent
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Jun 18, 2002
Grant Date -
N/A
app pub date -
Jan 21, 2000
filing date -
Jan 23, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method of measuring the distance between a mobile phone and a base station based on the round-trip delay (RTD) of a prescribed message transmitted from the base station to the mobile phone in a cellular mobile telephone system (CMTS), comprising the steps of calculating a mean error distance to adjust the distance between the base station and the mobile phone within the cell boundary of the base station, measuring the RTD between the base station and the mobile phone positioned at an arbitrary point within the cell, calculating the RTD distance between the base station and the mobile phone based on the RTD measurement by subtracting the mean error distance from the RTD distance.
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