= Un protocole multimedia multipoint à qualité de service différenciée

A differentiated quality of service oriented multimedia multicast protocol

• Auteur / Autrice : David Rafael Garduno Barrera
• Direction : Michel Diaz
• Type : Thèse de doctorat
• Discipline(s) : Réseaux et télécommunications
• Date : Soutenance en 2005
• Etablissement(s) : Toulouse, INPT

Mots clés

Mots clés contrôlés

UML (informatique)

Arbres (théorie des graphes)

Qualité de service

Multimédias

Mots clés libres

Multipoint

Arbre de plus court chemin

Résumé

Cette thèse propose M-FPTP, une nouvelle architecture multipoint (MP) à QdS différentiée. Basée sur des proxies client/serveur, elle connecte plusieurs LANs MP en utilisant des connections partiellement fiables. Cette architecture fournit une QdS différente pour chaque LAN par rapport à ses besoins. Pour ce faire, on a d’abord proposé un Arbre Hiérarchisé (AH) qui représente en même temps les performances du réseau et les contraintes de QdS des utilisateurs. Cependant, l’application de méthodes standard de création d’arbres sur un AH peut conduire à des problèmes de surcharge de la source. Un nouvel algorithme appelé Arbre de Plus Courts Chemins Limité en Sortie résout ce problème. Le déploiement de ce service nécessite, pour gérer les utilisateurs et le déploiement correct des proxies, un nouveau protocole appelé Protocole Simple de Session pour QdS MP.

Modern multimedia (MM) communication systems aim to provide new services such as multicast (MC) communication. But the rising of new very different MM capable devices and the growing number of clients drive to new requirements for mechanisms and protocols. In a MM communication, there are some flows that have constraints different from others and the required QoS for each flow is not the same. Furthermore, in MC communications, all the users do not want or are not able to receive the same QoS. These constraints imply that new communication mechanisms have to take into account the user requirements in order to provide an ad hoc service to each user and to avoid wasting the network resources. This dissertation proposes a new differentiated QoS multicast architecture, based on client/server proxies, called M-FPTP, which relays many MC LANs by single partially reliable links. This architecture provides a different QoS to each LAN depending on the users requirements. For doing so, it is also provided a network model called Hierarchized Graph (HG) which represents at the same time the network performances and the users QoS constraints. Nevertheless, the application of standard tree creation methods on an HG can lead to source overloading problems. It is then proposed a new algorithm called Degree-Bounded Shortest-Path-Tree (DgB-SPT) which solves this problem. However, the deployment of such a service needs a new protocol in order to collect users requirements and correctly deploy the proxies. This protocol is called Simple Session Protocol for QoS MC (SSP-QoM). The proposed solutions have been modeled, verified, validated and tested by using UML 2. 0 and TAU G2 CASE tool.