Méthode de localisation pour systèmes radio-mobile

Lokalisierungsverfahren für Mobilfunksysteme

Locating method for mobile radio systems

Abstract

In order to locate the position of a mobile station (MS) of a mobile radio system, the distance (D1) of the mobile station from a base transceiver station (BTS1) is determined, or the distances (D1, D2, D3) of the mobile station from at least two base transceiver stations (BTS1, BTS2, BTS3) are determined and the position (40) is found by triangulation. In a GSM-type system, there is a predetermined known response delay between a particular signal received by the mobile station from the base transceiver station and a particular response transmitted from the mobile station to the base transceiver station; the distances (D1, D2, D3) can therefore be determined from the response delay and a measured period between transmission of the particular signal and reception of the particular response. In a GSM-type system, the mobile station transmits messages indicating the signal strengths of the base transceiver stations it is receiving, and on that basis the system allocates one of the base transceiver stations to the mobile station; in order to measure the distance between the mobile station and at least one other base transceiver station, the messages are modified in order to force a handover from one base transceiver station to another. In a CDMA-type system, the "soft hand-off" feature can be used to determine the distance to two or more BTSs at the same time.

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