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Satellite Terminal Quality of Service Management with AQM Control

Romain Delpoux 1 Pascal Berthou 1 Frédéric Gouaisbaut 2 Yann Labit 2
1 LAAS-OLC
LAAS - Laboratoire d'analyse et d'architecture des systèmes
2 LAAS-MAC - Équipe Méthodes et Algorithmes en Commande
LAAS - Laboratoire d'analyse et d'architecture des systèmes
Abstract : The standardization of a Return Channel via Satellite (DVB-RCS) and the satellite community effor ts in term of interoperability over the last few years are expected to play, in a near future, a decisive role in Next Generation Networks (NGNs) through the integration of Satellite networks as an alternative to terrestrial networks like DSL (Digital Subscriber Line) in low terrestrial in-frastructure areas. Fur thermore, the advance of distributed multimedia applications like voice over IP and videoconference implies some new requirements to guarantee the Quality of Ser- vice (QoS). It concerns a limited transmission delay, a weak jitter, a minimal loss rate and a guaranteed bandwidth. The recent NGN architectures prone the adaptation of the diffser v architecture to satellite systems. In this paper, we consider an architecture compliant with the SatLabs recommendation and propose a mechanism to improve the QoS management in Return link Satellite Terminals (ST). The goal of this work is to regulate a priori the Diffser v AF queue and avoid the over-flood. Considering the AF queue sheared between UDP based multimedia applications and TCP based data transfer, the main idea consists in controlling TCP streams to guarantee transmission capacity of UDP packets. The most constraint application can then enjoy low buffers time delay and ver y few losses. In order to solve this problem, we design a congestion control mechanism based on Active Queue Management (AQM) techniques by using control theor y. To this end a fluid model of TCP connexion originally designed for wire-networks is proposed for satellite networks. Then, the design of a robust propor tional integral (PI) and a robust dead time based controllers are investigated. To avoid AF queue over flooding, TCP packets are voluntar y dropped in the ST according to regulation rules. TCP connection throughput is then controlled and limited to pro- tect UDP streams against unnecessar y drops. The different methods are then simulated on matlab and NS2-Simulator and compared to a classical DropTail mechanism.
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Romain Delpoux, Pascal Berthou, Frédéric Gouaisbaut, Yann Labit. Satellite Terminal Quality of Service Management with AQM Control. 15th Ka Band Conference, Sep 2009, Cagliari, Italy. pp.1. ⟨hal-00435757⟩

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