Extensions to distributed mac protocols with collision...

H - Electricity – 04 – L

Patent

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Details

H04L 29/06 (2006.01) H04L 29/04 (2006.01)

Patent

CA 2219044

In a communications network having a plurality of stations and a shared common communications medium using a collision avoidance media access protocol for communication between the stations; in which medium access is granted to a pair of stations obtaining a successful reservation of the medium; the pair of stations comprising a requester station and a target station; wherein the communication medium is reserved based on requester transmission of a Request-to-Send (RTS) control frame and the reply thereto by a target station with a Clear-to-Send control frame when the target station is ready to receive data; a method of transmission control comprising the following; if the target station is not ready to receive data from the requesting station the sending of a Hold-to-Send (HTS) control frame by the target station to the requesting station; the target station recording identification of the requesting station; the requesting station recording the target station as being inhibited.

Méthode conçue pour un réseau de transmission comportant un certain nombre de stations et un support de transmission partagé respectant un protocole d'accès anticollision pour les communications entre les stations. L'accès au support est garanti, sur réservation, à une paire de stations composée d'une station demandeuse et d'une station cible. La réservation du support de transmission se fait comme suit : la station demandeuse envoie une trame de commande RTS (demande pour émettre) et la station cible répond en envoyant une trame de commande CTS (prêt pour l'émission) lorsqu'elle est prête à recevoir les données. La méthode de commande de transmission présentée ici comprend les étapes suivantes : si la station cible n'est pas prête à recevoir les données de la station demandeuse, elle lui envoie une trame de commande HTS (émission en différé); la station cible enregistre l'identification de la station demandeuse et celle-ci enregistre la station cible comme inaccessible.

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