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Sarwar, Golam (2014)
Languages: English
Types: Article
Subjects: Protocoles de transport, Multimedia, Codes à effacements, 000, Transportprotocol, Erasure coding
Les communications multimedia à forte contrainte de délai dominent de plus en plus l'Internet et supportent principalement des services interactifs et de diffusion de contenus multimedia. En raison de la prolifération des périphériques mobiles, les liaisons sans-fil prennent une part importante dans la transmission de ces données temps réel. Un certain nombre de questions doivent cependant être abordées afin d'obtenir une qualité de service acceptable pour ces communications dans ces environnements sans-fil. En outre, la disponibilité de multiples interfaces sans-fil sur les appareils mobiles offre une opportunité d'améliorer la communication tout en exacerbant encore les problèmes déjà présents sur les liaisons sans-fil simples. Pour faire face aux problèmes d'erreurs et de délai de ces liaisons, cette thèse propose deux améliorations possibles. Tout d'abord, une technique d'amélioration pour le protocole de transport multimedia Datagram Congestion Control Protocol (DCCP/CCID4) pour lien long délai (par exemple, lien satellite) qui améliore significativement les performances du transport de la voix sur IP (VoIP). En ce qui concerne les erreurs de lien et le multi-chemin, cette thèse propose et évalue un code à effacement adapté au protocole Stream Transport Control Protocol (CMT-SCTP). Enfin, un outil d'évaluation en ligne de streaming de qualité vidéo, implémentant une méthode cross-layer d'évaluation de la qualité vidéo en temps-réel pour encodeur H.264 est proposé à la communauté réseau en open-source. Real time communications have, in the last decade, become a highly relevant component of Internet applications and services, with both interactive (voice and video) communications and streamed content being used by people in developed and developing countries alike. Due to the proliferation of mobile devices, wireless media is becoming the means of transmitting a large part of this increasingly important real time communications traffic. Wireless has also become an important technology in developing countries (and remote areas of developed countries), with satellite communications being increasingly deployed for traffic backhaul and ubiquitous connection to the Internet. A number of issues need to be addressed in order to have an acceptable service quality for real time communications in wireless environments. In addition to this, the availability of multiple wireless interfaces on mobile devices presents an opportunity to improve and further exacerbates the issues already present on single wireless links. Mitigation of link errors originating from the wireless media, addressing packet reordering, jitter, minimising the link and buffering (required to deal with reordering or jitter) delays, etc. all contribute to lowering user's quality of experience and perception of network quality and usability. Therefore in this thesis, we consider improvements to transport protocols for real time communications and streaming services to address these problems.
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