Positioning system

H - Electricity – 04 – Q

Patent

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Details

H04Q 7/36 (2006.01) G01S 5/02 (2006.01) G01S 5/14 (2006.01) G08G 1/137 (2006.01) H04Q 7/38 (2006.01)

Patent

CA 2210723

The invention relates to a method and to a system for frequently determining the position of a mobile station (40) in a cellular mobile telephone system, particularly a GSM system. The position of a mobile station in the system is determined by carrying out a simulated call setup, i.e., the call setup is interrupted subsequent to a telephone switching centre (MSC) having received a paging response containing the identity of the cell and optionally timing advance. In one embodiment of the invention, a mobile station (40) is also commanded to connect itself to base stations (44) contained in its neighbour list, whereafter the mobile station sends position determining parameters to a position handler (14), the goegraphical position of the base station is analyzed from the cell identity and the optional timing advance. The position of the mobile station is presented graphically on a picture screen and is updated constantly after each call setup. The call setups are generated by the position handler (14).

L'invention est constituée par une méthode et un système servant à déterminer fréquemment la position d'une station mobile (40) dans un système téléphonique mobile cellulaire, particulièrement un système GSM. La position d'une station mobile dans ce système est déterminée par la simulation de l'établissement d'un appel : l'établissement de l'appel est interrompu quand un central téléphonique a reçu une réponse de radiomessagerie contenant l'identification de la cellule et, facultativement, l'avance temporelle. Dans l'une des concrétisations de l'invention, une station mobile (40) reçoit également l'instruction de se connecter aux stations de base (44) contenues dans sa liste de voisins, après quoi elle transmet ses paramètres de localisation à un module de localisation (14) qui analyse sa position géographique à partir de l'identification de la cellule et, si cette identification a été fournie, de l'avance temporelle. La position de la station mobile est alors représentée graphiquement sur un écran et est constamment mise à jour après chaque établissement d'appel. Les établissements d'appel sont effectués par le module de localisation (14).

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