Reservation requesting and allocating method on a...

H - Electricity – 04 – L

Patent

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Details

H04L 12/56 (2006.01) H04B 7/212 (2006.01)

Patent

CA 2322886

The invention relates to a communication system comprising a main station, a transmission medium, and terminals. The terminals transmit requests to the main station for the purpose of having reservations granted to them on the transmission medium. Each request indicates a number of reservations. This number of reservations is obtained in a known manner from the number of data packets waiting in the transmission memory of the terminal (MEM(i,t)), from which the number of reservations already requested but not yet granted (counted by a request counter COUNT(i)) is deduced. Upon receiving a request, the main station adds the number of reservations indicated (RESA(i,t)) to an allocation counter (ALLOC(i)) associated with the requesting terminal (i). The invention improves this requesting method so as to render it less vulnerable to data losses. It consists in a resetting of the request counter (COUNT(i)) and allocation counter (ALLOC(i)), for example when an anomaly is detected in the transmission of the data (51). Application: Interactive satellite distribution network.

Cette invention concerne un système de communication comprenant une station principale, un support de transmission et des terminaux. Ces terminaux transmettent à la station principale des demandes relatives à des réservation sur le support de transmission. Chaque demande correspond à un certain nombre de réservations. Ce nombre est déterminé classiquement à partir du nombre de paquets de données en attente dans la mémoire de transmission du terminal (MEM(i,t)), dont on déduit le nombre de réservations déjà demandées, mais non encore accordées ( au moyen d'un compteur de demandes COUNT(i)). A la réception d'une demande, la station principale porte le nombre de réservations indiqué (RESA(i,t)) au compteur d'attribution (ALLOC(i)) associé au terminal demandeur (i). Cette invention permet d'améliorer la méthode de demande dans la mesure où elle rend cette dernière moins vulnérable à des pertes de données. Avec cette méthode, on procède à un réarmement des compteurs de demande (COUNT(i)) et d'attribution (ALLOC(i)), par exemple en cas de détection d'une anomalie dans la transmission des données (51). Application: réseau interactif de distribution par satellite.

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