Frame synchronization system among multiple radio base...

H - Electricity – 04 – J

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H04J 3/02 (2006.01) H04B 7/212 (2006.01) H04B 7/26 (2006.01) H04Q 7/22 (2006.01) H04J 3/06 (2006.01)

Patent

CA 2033309

A TDMA digital mobile communications system prevents TDMA frame synchronization from being asynchronous among radio base stations when a communication held by a mobile station is handed over from one service area to another. A control station sends a reset pulse for TDMA frame synchronization to the radio base stations each being situated in a particular service area over communications cables. In response, the radio-base stations each generates a TDMA frame. The control station has a synchronous signal generator for generating the reset pulse while each radio base station has a time delay adjustment unit for adjusting the time delay of the reset pulse. The synchronous signal generator and the time delay adjustment units of the individual radio base stations perform measurement and setting such that a reset signal has the same time delay between the control station and all of the radio base stations. Hence, regarding a TDMA signal which the mobile station receives, TDMA frame synchronization is immediately set up at the time of hand-over and thereby prevents a voice signal from being interrupted.

Un système de communication mobile numérique AMRT empêche la synchronisation de trames AMRT d'être asynchrone entre des stations radio de base lorsqu'une communication en cours à une station mobile est transférée d'une zone de service à une autre. Une station de commande envoie aux stations de base, sur des câbles de transmission, une impulsion de remise à zéro pour la synchronisation de trame AMRT, chacune des stations de base étant située dans une zone de service particulière. En réponse, les stations de base produisent chacune une trame AMRT. La station de commande comporte un générateur de signal synchrone pour produire l'impulsion de remise à zéro tandis que chaque station radio de base comporte un dispositif pour régler la temporisation de l'impulsion de remise à zéro. Le générateur de signal synchrone et les unités de réglage de temporisation de chaque station radio de base effectuent la mesure et le réglage voulus pour qu'un signal de remise à zéro ait la même temporisation entre la station de commande et toutes les stations radio de base. Ainsi, en ce qui concerne un signal AMRT reçu par la station mobile, la synchronisation de trame AMRT est immédiatement définie au moment du transfert, ce qui empêche l'interruption d'un signal vocal.

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