Modélisation et analyse de performances du trafic multimédia dans les réseaux hétérogènes

Abstract : This thesis contains research results concerning traffic and multimedia application modelling and performance analysis in heterogeneous networks. Aggregate IP traffic as well as audio, video and data applications are studied, and a generic hierarchical model to describe multimedia traffic sources is derived. This model helps representing multimedia applications in simple, precise and generic manner. The generic model is implemented and constitutes the core of a powerful modelling and simulation tool for traffic sources. We characterize IP traffic generated by multimedia applications using models developed with this tool. In particular, we handle the issue of modelling aggregated traffic sources, and provide simple aggregated models used to replace the superposition of audio, video and data traffic sources. Aggregate TCP traffic presents dynamic statistical properties in function of packet loss rate observed in the network. This is because of the closed-loop control used by TCP. Thus, a new analytical model of TCP based on differential traffic theory is proposed. This model offers a reliable representation of TCP traffic while achieving good performances in large scale networks. Finally, we extend the architecture of SIP protocol in order to provide an application level management of Quality of Service. The suggested mechanisms rely on stochastic scheduling of sessions and bandwidth reservation using equivalent bandwidth evaluation techniques. This last mechanism makes it possible to use Erlang formulas in packet switching networks
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  • HAL Id : tel-00130060, version 1

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Hassan Hassan. Modélisation et analyse de performances du trafic multimédia dans les réseaux hétérogènes. Automatique / Robotique. Université Paul Sabatier - Toulouse III, 2006. Français. ⟨tel-00130060⟩

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