Absolute time synchronization for mobile positioning in a...

H - Electricity – 04 – B

Patent

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H04B 7/26 (2006.01) G01S 1/02 (2006.01) G01S 5/02 (2006.01) G01S 5/06 (2006.01) H04J 3/06 (2006.01)

Patent

CA 2330280

A method and system are diclosed for time-synchronizing a plurality of radio base stations (RBS1-4) in a cellular communications network. A reference terminal (106) (e.g., modified standard mobile terminal) is placed at known locations at each RBS site in the network, preferably as close to the base station antenna (104) as possible. The reference terminal (106) includes an absolute time reference function, which is used to synchronize the RBSs (102) with respect to a common absolute time reference. Consequently, a positioning algorithm can be used to determine the position of a mobile terminal (12) in the network with a relatively high degree of accuracy.

L'invention concerne un procédé et un système pour la synchronisation dans le temps de plusieurs stations radios fixes (RBS1-4) d'un réseau de communication cellulaire. Un terminal de référence (106)(ex : un terminal mobile standard modifié) est placé à des endroits connus, au niveau de chaque site RBS du réseau, de préférence le plus près possible de l'antenne (104) de la station fixe. Le terminal de référence (106) comprend une fonction de référence dans le temps absolu, utilisée pour la synchronisation des RBS (102) par rapport à une référence commune dans le temps absolu. Par conséquence, un algorithme de localisation peut être utilisé pour la détermination de la position d'un terminal mobile (12) du réseau, avec un degré de précision relativement élevé.

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