Use of mobile stations for determination of base station...

G - Physics – 01 – S

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G01S 5/02 (2010.01) H04W 64/00 (2009.01) G01S 5/06 (2006.01)

Patent

CA 2471568

In a wireless communication network, base station antenna positions and time offsets are stored in a base station almanac data base along with other information used for obtaining the most reliable mobile station position fixes under a variety of conditions. The system uses the position fixes of mobile stations and terrestrial ranging information to determine base station antenna positions and base station timing offsets. The base station antenna positions are determined during normal mobile station position determinations, in order to maintain and improve the antenna location data, and to correct for change or relocation of the base station antennas. It is possible to recover quickly from a loss of cell sector identity during relocation of a base station antenna, and to ensure accuracy of mobile station position determination based on ranging from the base stations, and rapid acquisition of position data from mobile stations having global satellite receivers.

Dans un réseau de radiocommunications, les positions d'antennes des stations de base et les écarts de synchronisation sont conservés dans une base de données almanach des stations de base, accompagnés d'autres informations utilisées pour obtenir les relevés de position les plus fiables des stations mobiles sous diverses conditions. Le système utilise les relevés de position des stations mobiles et l'information de distance terrestre pour déterminer les positions d'antennes de la station de base et les écarts de synchronisation des stations de base. La détermination des positions d'antennes des stations de base se fait pendant les déterminations normales des positions de stations mobiles, de façon à entretenir et améliorer les données des positions d'antennes, et pour tenir compte des modifications ou repositionnements des antennes des stations de base. L'invention permet ainsi, non seulement de faire rapidement la reprise après une perte d'identité de secteur de cellule pendant le repositionnement d'une antenne de station de base, mais aussi de garantir la précision de la détermination des positions des stations mobiles sur la base, d'une part des mesures de distance par rapport aux stations de base, et d'autre part de l'acquisition rapide de données de position en provenance de stations mobiles équipées de récepteurs pour satellites à couverture mondiale.

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