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Method of locating a mobile phone by measuring the distance between the phone and a base station in a cellular mobile telephone system

  • US 6,408,186 B1
  • Filed: 01/21/2000
  • Issued: 06/18/2002
  • Est. Priority Date: 01/23/1999
  • Status: Expired due to Fees
First Claim
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1. A method for measuring a mean error distance to adjust the distance between a mobile phone and a base station in a cell obtained by a round-trip delay (RTD) of a prescribed message transmitted from said base station to said mobile phone in a cellular mobile telephone system (CMTS), said method comprising the steps of:

  • determining a plurality of measuring points within the cell of said base station to be used for obtaining said mean error distance;

    measuring respective RTDs between said measuring points and said base station by sequentially positioning said mobile phone at each of said measuring points;

    calculating respective RTD distances between said measuring points and said base station based on said RTD measurements;

    obtaining respective Global Positioning System(GPS) data for said measuring points and said base station;

    calculating respective GPS distances between said measuring points and said base station based on said GPS data;

    calculating respective error distances by taking the difference between said respective RTD distances and said GPS distances; and

    , obtaining said mean error distance from said respective error distances.

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