Method for call admission in packet voice system using...

H - Electricity – 04 – L

Patent

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H04L 12/56 (2006.01) H04Q 11/04 (2006.01) H04L 12/64 (2006.01)

Patent

CA 2248485

An AAL2/SSCS packet voice system multiplexes various forms of voice-band traffic including voice packets, fax packets, and data packets into a virtual circuit (VC). This AAL2/SSCS packet voice system executes a dynamic call admission algorithm that takes into account call type in deciding whether to admit a new call to the VC. In particular, this approach takes into account different bandwidth needs for different call types. The AAL2/SSCS packet voice system also performs bit or block dropping on voice packets to mitigate the effects of traffic congestion. The bit or block dropping is done based on the packet queue fill value exceeding at least one queue threshold. Further, the AAL2/SSCS packet voice system also dynamically varies a queue threshold as a function of capacity.

L'invention est un système de communication vocale à transmission de paquets AAL2/SSCS qui multiplexe diverses formes de trafic de bande de communication vocale sur un circuit virtuel, dont des paquets de communication vocale, de télécopie et de données. Ce système exécute un algorithme d'acceptation des appels dynamique qui tient compte du type de l'appel pour décider si celui-ci doit être accepté sur le circuit virtuel. En particulier, cette méthode tient compte des différentes largeurs de bande nécessaires selon les différents types d'appel. Ce système de communication vocale à transmission de paquets AAL2/SSCS effectue également des largages de bits ou de blocs sur les paquets de communication vocale pour atténuer l'encombrement dans le trafic. Ce largage de bits ou de blocs est effectué quand la valeur de remplissage de la file d'attente de paquets dépasse un seuil au moins. Finalement, le système de l'invention fait varier dynamiquement les seuils de file d'attente en fonction de la capacité.

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