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Method to localize a mobile telephone

  • US 6,167,276 A
  • Filed: 08/02/1999
  • Issued: 12/26/2000
  • Est. Priority Date: 08/04/1998
  • Status: Expired due to Term
First Claim
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1. A method for the localizing of a mobile telephone in a network of base transceiver stations comprising the following steps:

  • a first, second and third base transceiver station are located,a first, second and third duration of propagation between the first, second and third base transceiver stations and the mobile telephone are measured respectively,the distances between this first, second and third base transceiver stations and the mobile telephone are deduced therefrom, andthe mobile telephone is localized with these distances and these locations of base transceiver stations,wherein,one and the same absolute clock is made known in order to set the times of the base transceiver stations,the first base transceiver station sends a first piece of information h1 of an absolute date to the mobile telephone, this first information h1 corresponding to a first absolute date H1 for this first base transceiver station,the mobile telephone receives this first piece of information h1 of absolute date and, after a period of waiting known to the first base transceiver station, it sends a response signal,the first base transceiver station receives this response signal at another absolute date H'"'"'1,the first base transceiver station computes a piece of information on propagation τ

    1 between itself and the mobile telephone on the basis of the difference between the two absolute dates H1 and H'"'"'1 and of the known waiting duration,the first base transceiver station sends the mobile telephone the piece of information on propagation τ

    1,the second and third base transceiver stations send a second piece of information and third piece of information h2 and h3 on absolute date, andthe mobile telephone is localized on the basis of these pieces of information h1, h2, h3 on absolute date received by the mobile telephone, their reception date and the information on propagation.

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