H - Electricity – 04 – Q
Patent
H - Electricity
04
Q
H04Q 7/36 (2006.01) G01S 5/14 (2006.01) H04Q 7/38 (2006.01)
Patent
CA 2216939
A mobile terminal locator for locating a mobile terminal (24) in a cellular telecommunication system (10) identifies a plurality of candidate handoff cells (22, 23) having sufficient signal strength to maintain a call and forces sequential handoffs of the mobile terminal (24) from its serving cell (21) to the plurality of candidate handoff cells (22, 23). The locator then measures signal strength and propagation delay between the mobile terminal (24) and the base stations. Either the signal strength, the propagation delay, or both are then used to calculate a distance between the mobile terminal (24) and each base station associated with each of the plurality of candidate handoff cells (22, 23) and between the mobile terminal (24) and its serving base station (21). From the calculated distances, a plurality of arcs of possible locations (26, 29, 30) of said mobile terminal are then defined. Finally the mobile terminal locator calculates an intersection point of the plurality of arcs of possible locations (26, 29, 30), defining the location of the mobile station (24). The locator may operate in cellular telecommunication systems with or without synchronized timing reference signals from the base stations.
L'invention porte sur localisateur de terminal mobile destiné à localiser un terminal mobile (24) dans un système de télécommunications cellulaires (10), lequel identifie une pluralité de cellules de transfert candidates (22, 23), dont la puissance du signal suffit à maintenir un appel, et provoque des transferts séquentiels du terminal mobile (24) de sa cellule serveur (21) à la pluralité de cellules de transfert candidates (22, 23). Le localisateur mesure ensuite la puissance du signal et le temps de propagation entre le terminal mobile (24) et les stations de base. On utilise soit la puissance du signal, soit le temps de propagation ou les deux pour calculer la distance existant entre le terminal mobile (24) et chaque station de base associée à chaque cellule appartenant à la pluralité de cellules de transfert candidates (22, 23), ainsi qu'entre le terminal mobile (24) et sa station de base serveur (21). On définit ensuite une pluralité d'arcs d'emplacements possibles (26, 29, 30) dudit terminal mobile à partir des distances calculées. Le localisateur de terminal mobile calcule enfin un point d'intersection d'une pluralité d'arcs d'emplacements possibles (26, 29, 30), déterminant l'emplacement de la station mobile (24). Le localisateur peut fonctionner dans un système de télécommunications cellulaires avec ou sans synchronisation des signaux de référence de rythme délivrés par des stations de base.
Marks & Clerk
Telefonaktiebolaget Lm Ericsson
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