Individual codec pathway impairment indicator for use in a...

H - Electricity – 04 – L

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H04L 29/02 (2006.01) H04W 76/00 (2009.01) H04L 12/12 (2006.01)

Patent

CA 2618998

A system and method are described for controlling the setup of a connection in a communication network that includes a set of nodes, such as Mobile Switching Centers (MSCs) and Media Gateways (MGWs). In one example, a speech connection is established between MGWs subject to the control of the MSCs, which can selectively activate or deactivate codecs along the connection. The codecs are selected from a list of supported codecs, each potentially affecting connection quality by differing amounts. A Total Accumulated Impairment (TAI) element is forwarded between the MSCs and step by step updated by these MSCs that includes individual partially accumulated impairment values corresponding to each of the supported codec candidates. Each individual indicator value provides information representative of the expected accumulated impairment along a candidate connection path leading up to, and including, the corresponding codec. By providing information pertaining to the expected accumulated impairment along each candidate connection path, the MSCs can determine an optimum sequence of codecs so as to minimize the overall connection impairment.

L'invention concerne un système et procédé destinés à réguler l'installation d'une connexion dans un réseau de communication qui comprend un ensemble de noeuds, tels que des centres de commutation mobile (MSC) et des passerelles multimédia (MGW). Dans l'un des modes de réalisation, une connexion vocale est établie entre le sujet MGW afin de réguler le MSC, qui peut activer ou désactiver de manière sélective les codecs le long de la connexion. Les codecs sont sélectionnés à partir d'une liste de codecs supportée, chacun affectant de façon potentielle la qualité de connexion à variation des quantités. Un élément de défaillances accumulées totales (TAI) est transféré entre le MSC et mis à jour étape par étape par ces MSC qui contiennent des valeurs de défaillances partiellement accumulées individuelles correspondant à chacun des candidats codec supportés. Chaque valeur indicatrice individuelle fournit des informations représentatives de la défaillance accumulée prévue le long d'un trajet de connexion candidat menant au codec correspondant et l'incluant. En fournissant des informations concernant la défaillance accumulée prévue le long de chaque trajet de connexion candidat, les MSC peuvent déterminer une séquence optimale de codecs de manière à réduire au minimum la défaillance de connexion globale.

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