Distributed synchronization method and system

H - Electricity – 04 – J

Patent

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H04J 3/06 (2006.01)

Patent

CA 2568558

The invention relates to a distributed synchronization method in a communications network comprising a number of stations that exchange messages with one another. The inventive method comprises at least the following steps: inserting into each message transmitted by a transmitter, a synchronization pattern characteristic of the time reference of the transmitter, and; updating the time reference of each station with the time reference it receives from another station of the network if and only if the time received is ahead of the time reference. The updating ensues in the following manner: calculating the difference ?X=T'a-Ta between the transmission time T'a of the message received by a station A and the receiving time Ta of the same message by station B, and; applying a correction 0<?Y<=?X if the transmission time received is ahead of a value of at least .tau. (??>.tau.>0).

Procédé de synchronisation distribuée dans un réseau de communication comportant plusieurs stations échangeant entre elles des messages comportant au moins les étapes suivantes insérer dans chaque message transmis par un émetteur un motif de synchronisation caractéristique de la référence horaire de l'émetteur, mettre à jour la référence horaire de chaque station par la référence horaire qu'il reçoit d'une autre station du réseau si et seulement si l'heure reçue est en avance sur la référence horaire, la mise à jour se faisant de la manière suivante: calculer la différence .DELTA.X=T'a-Ta entre l'heure d'émission T'a du message reçu par une station A et l'heure de réception Ta du même message par la station B, appliquer une correction 0<.DELTA.Y<=.DELTA.X si l'heure reçue d'émission est en avance d'une grandeur au moins i .tau. (.DELTA..CHI.>.tau.>0).

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