A method and a system in a cellular network

H - Electricity – 04 – B

Patent

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Details

H04B 7/26 (2006.01) H04J 3/06 (2006.01) H04Q 7/36 (2006.01)

Patent

CA 2294269

In a cellular mobile radio system, co-channel radio base stations are provided with a time reference signal being a synchronizing signal or a time reference from another co-channel radio base station. Each co- channel radio base station (708, 712) is also provided with a radio base station specific time offset (720, 722) differing between the co- channel radio base stations by at least a predetermined value which prevents known sequences in desired signals and known sequences in interfering signals from overlapping in a disturbing way at reception. In each co-channel radio base station the time reference signal and the radio base station specific offset are used for the timing of sending bursts downlink from the co-channel radio base stations towards mobile radio stations. Each radio base station has functions receiving the time reference signal, storing the time offset and using the time reference signal and the time offset for the timing of the burst termination on the downlink (720).

Cette invention concerne un système radio mobile et cellulaire dans lequel des stations de base radio à canal commun possèdent un signal de référence temporelle qui consiste en un signal de synchronisation ou en une référence temporelle provenant d'une autre station de base radio à canal commun. Chaque station de base radio à canal commun (708, 712) possède également un décalage temporel (720, 722) spécifique à la station et qui diffère de celui des autres stations de base d'au moins une valeur prédéterminée. Ce système permet ainsi d'éviter que les séquences connues de signaux voulus et que les séquences connues de signaux d'interférences ne se chevauchent et perturbent la réception. Dans chaque station de base radio à canal commun, le signal de référence temporelle et le décalage spécifique à la station de base permettent de synchroniser l'envoi de rafales en liaison descendante depuis lesdites stations de base radio à canal commun vers les stations radio mobiles. Chaque station de base radio possède des fonctions de réception du signal de référence temporelle, de stockage du décalage temporel, et d'utilisation du signal de référence temporelle ainsi que du décalage temporel, ceci de manière à pouvoir synchroniser l'arrêt des rafales dans la liaison descendante.

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