G - Physics – 01 – S
Patent
G - Physics
01
S
G01S 5/14 (2006.01) H04Q 7/34 (2006.01) G01S 5/02 (2006.01) H04Q 7/36 (2006.01)
Patent
CA 2303264
A method and system are disclosed by which a round--trip calculation is used to determine the distance between a mobile radio station (MS) and a radio base station (BS) using the apparent uplink and downlink signal propagation air-times (e.g., T-up and T-down). As such, no absolute time reference is required. The MS and BS report to a service node in the mobile network the local departure and arrival times of the uplink and downlink signals, and calculate the apparent air-times, T-up and T-down. The distance, D, between the MS and BS can be calculated as D = c(T-up + T-down)/2, where "c" equals the speed of light. The distances, D1, D2 and D3, to at least three base stations whose locations are known, can be used in a triangulation algorithm to determine the MS's position.
L'invention porte sur un procédé (500) et un système (200) qui par un calcul aller/retour permet de mesurer la distance entre une station mobile de radio (MS) (208) et une station radio de base (BS) (BS0, BS1, BS2) en fonction des temps de propagation aérienne des liaisons ascendante et descendante (par exemple Tup et Tdown). Il n'est donc pas nécessaire de recourir à une base de temps absolue. Les stations MS et BS fournissent à un noeud de service (203) du réseau mobile les temps locaux de départ et d'arrivée (308, 328) des signaux (212, 215) et calculent les temps apparents Tup et Tdown de propagation aérienne des liaisons ascendante et descendante. La distance D séparant la MS de la BS est donnée par D = c (Tup + Tdown)/2 où c = la vitesse de la lumière. Les distances D1, D2 et D3 d'au moins trois stations de base dont les emplacements sont connus peuvent servir dans un algorithme de triangulation pour calculer la position de MS'.
Cedervall Mats
Lundqvist Patrik
Marks & Clerk
Telefonaktiebolaget L. M. Ericsson (publ)
Telefonaktiebolaget Lm Ericsson
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