Bandwidth allocation method and passive optical network system

H - Electricity – 04 – L

Patent

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H04L 12/44 (2006.01)

Patent

CA 2714025

An object of the present invention is to quickly perform convergence of a time average allocated bandwidth on a target bandwidth. In the invention, an optical line terminal calculates a requirement threshold for each optical subscriber unit based on a difference between the time average allocated bandwidth of each optical subscriber unit and the target bandwidth, and notifies a corresponding optical subscriber unit of the calculated requirement threshold. The corresponding optical subscriber unit then notifies, based on the data amount accumulated in a buffer, the optical line terminal of a data amount, as a transmission requirement, up to a data separation that is less or equal to the notified requirement threshold and in which a maximum transmission amount can be transmitted. The optical line terminal then notifies the corresponding optical subscriber unit of a transmission permission amount in which the data equal to the transmission requirement of which the optical line terminal is notified can be transmitted. The corresponding optical subscriber unit then transmits the data amount corresponding to the transmission permission amount.

Selon l'invention, il est possible de faire converger de manière lisse la bande d'allocation de temps moyen vers une bande cible. Un dispositif de station de terminal optique calcule une valeur seuil de quantité requise pour chacun des dispositifs d'abonné optiques conformément à une différence entre la bande d'allocation de temps moyen et la bande cible pour chacun des dispositifs d'abonné optiques et rapporte la valeur seuil de quantité requise calculée au dispositif d'abonné optique. Ensuite, le dispositif d'abonné optique rapporte, en tant que quantité de demande de transmission, une quantité de données de transmission maximale jusqu'à un élément de délimitation de données qui n'est pas supérieur à la valeur seuil de quantité requise rapportée conformément à la quantité de données accumulée dans le tampon, au dispositif de station de terminal optique. Ensuite, le dispositif de station de terminal optique rapporte une quantité permise de transmission qui peut transmettre la même quantité que la quantité de demande de transmission rapportée au dispositif d'abonné optique. Ensuite, le dispositif d'abonné optique transmet une quantité de données conformément à la quantité permise de transmission.

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