System and method of dynamically calibrating base station...

H - Electricity – 04 – W

Patent

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H04W 24/04 (2009.01)

Patent

CA 2425467

A system and method for dynamically calibrating a base station in a wireless communication system, is presented herein. In accordance with an embodiment of the invention, the system includes a base station for transmitting, receiving, and processing communication signals and a wireless communication device for communicating with the base station. The wireless communication device is configured to determine its location (e.g., using GPS information), to detect the arrival time of a first signal transmitted from the base station, and to calculate a line-of-sight (LOS) delay corresponding to the LOS distance between the wireless communication device and the base station. The LOS distance calculation is based on the base station location information and the wireless communication device location information. The base station measures a round trip delay (RTD) corresponding to the delay incurred by the first signal and a delay incurred by a second signal transmitted from the wireless communication device back to the base station in response to the first signal. The base station then determines a base station timing calibration error based on the LOS delay, the first signal arrival time, and the RTD, and dynamically calibrates the base station timing to compensate for the base station timing calibration error.

L'invention concerne un système et un procédé destinés à étalonner dynamiquement une station de base dans un système de communication sans fil. Selon un mode de réalisation de l'invention, ce système comprend une station de base destinée à émettre, recevoir et traiter des signaux de communication, ainsi qu'un dispositif de communication sans fil permettant de communiquer avec cette station de base. Le dispositif de communication sans fil est conçu pour déterminer son emplacement (notamment au moyen d'informations GPS), pour détecter l'heure d'arrivée d'un premier signal émis à partir de la station de base, et pour calculer un retard en ligne directe (LOS) correspondant à la distance en ligne directe (LOS) entre le dispositif de communication sans fil et la station de base. Le calcul de la distance LOS est fondé sur les informations de localisation de la station de base et sur les informations de localisation du dispositif de communication sans fil. La station de base mesure un temps de propagation aller-retour (RTD) correspondant au retard provoqué par le premier signal et à un retard provoqué par un second signal émis à partir du dispositif de communication sans fil en retour vers la station de base en réponse à ce premier signal. La station de base détermine alors une erreur d'étalonnage de synchronisation de station de base sur la base du retard LOS, de l'heure d'arrivée du premier signal et du RTD, puis étalonne de manière dynamique la synchronisation de la station de base en vue de corriger l'erreur d'étalonnage de synchronisation de la station de base.

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