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Amélioration des services vidéo fournis à travers les réseaux radio mobiles

Abstract : In this thesis, video communication systems are studied for application to video services provided over wireless mobile networks. This work emphasizes on point-to-multipoint communications and proposes many enhancements to the current systems: First, a scheme combining robust decoding with retransmissions is defined so that the number of retransmissions is reduced and the quality of the received video can be controlled. As opposed to current retransmissionless and retransmission-based schemes, this scheme also offers the possibility to trade throughput for quality and vice versa. Then, the transmission of a two-level scalable video sequence towards several clients is considered. Schemes using the basic Go-back-N (GBN) and Selective Repeat (SR) Automatic Repeat reQuest (ARQ) techniques are studied. A new scheme is also proposed and studied. The new scheme reduces the buffering requirement at the receiver end while keeping the performance optimal (in terms of the amount of data successfully transmitted within a given period of time). The different schemes were shown to be applicable to 2G, 3G and WiMAX systems. Finally, we prove that retransmissions can be used in point-to-multipoint communications up to a given limit on the number of receivers (contrary to the current wireless systems where ARQ is only used sin point-to-point communications). If retransmissions are introduced in the current Multicast/Broadcast services (supported by the 3GPP and mobile WiMAX), the system will guarantee a certain amount of receivers to have the nominal quality whereas the current Multicast/Broadcast services do not garantee any receiver of the nominal quality.
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Contributor : Ecole Télécom ParisTech Connect in order to contact the contributor
Submitted on : Sunday, October 17, 2010 - 8:00:00 AM
Last modification on : Friday, July 31, 2020 - 10:44:07 AM
Long-term archiving on: : Thursday, March 30, 2017 - 6:01:25 AM


  • HAL Id : pastel-00006335, version 1



Khaled Bouchireb. Amélioration des services vidéo fournis à travers les réseaux radio mobiles. domain_other. Télécom ParisTech, 2010. Français. ⟨pastel-00006335⟩



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