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CELLULAR RADIO POSITIONING

  • US 20020077115A1
  • Filed: 01/14/1999
  • Published: 06/20/2002
  • Est. Priority Date: 01/15/1998
  • Status: Active Grant
First Claim
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1. A method of determining the position of a mobile communications device within a cellular network, the method comprising the steps of:

  • transmitting data to the mobile communication device from the cellular network, said data identifying to the mobile communication device a list of radio channels corresponding to respective radio transmitters of the cellular network, said list being determined on the basis of the approximate position of the mobile communication device; and

    causing the mobile communication device to listen on said identified channels, or on other channels excluding said identified channels, and to determine from information transmitted over the listened to channels data values related to the relative geometry of the mobile communication device and the radio transmitters transmitting the listened to channels; and

    determining the position of the mobile communication device using said determined data values.

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