Scalable and Media Aware Adaptive Video Streaming over Wireless Networks
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Research Article Scalable and Media Aware Adaptive Video Streaming over Wireless Networks ´ Nicolas Tizon1, 2 and Beatrice Pesquet-Popescu1 1 Signal 2 R&D
and Image processing Department, TELECOM ParisTech, 46 Rue Barrault, 75634 Paris, France Department, Soci´et´e Franc¸aise du Radiot´el´ephone (SFR), 1 Place Carpeaux, Tour S´equoia, 92915 La D´efense, France
Correspondence should be addressed to B´eatrice Pesquet-Popescu, [email protected] Received 29 September 2007; Accepted 6 May 2008 Recommended by David Bull This paper proposes an advanced video streaming system based on scalable video coding in order to optimize resource utilization in wireless networks with retransmission mechanisms at radio protocol level. The key component of this system is a packet scheduling algorithm which operates on the different substreams of a main scalable video stream and which is implemented in a so-called media aware network element. The concerned type of transport channel is a dedicated channel subject to parameters (bitrate, loss rate) variations on the long run. Moreover, we propose a combined scalability approach in which common temporal and SNR scalability features can be used jointly with a partitioning of the image into regions of interest. Simulation results show that our approach provides substantial quality gain compared to classical packet transmission methods and they demonstrate how ROI coding combined with SNR scalability allows to improve again the visual quality. Copyright © 2008 N. Tizon and B. Pesquet-Popescu. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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INTRODUCTION
Streaming video applications are involved in an increasing number of communication services. The need of interoperability between networks is crucial and media adaptation at the entrance of bottleneck links (e.g., wireless networks) is a key issue. In the last releases of 3G networks [1], jointly with a high speed transport channel, the high speed downlink packet access (HSDPA) technology provides enhanced channel coding features. On the one hand, packet scheduling functionalities of the shared channel located close to the air interface allow to use radio resources more efficiently. On the other hand, error correction mechanisms like hybrid automatic repeat request (HARQ) or forward error correction (FEC) contribute to build an error resilient system. However, these enhancements are designed to be operational through a large collection of services without considering subsequent optimizations. In the best case, a QoS framework would be implemented with network differentiated operating modes to provide a class of services [2]. To guarantee continuous video playout, streaming services are constrained by strictly delay bounds. Usually, guaranteed bitrates (GBR) are negotiated to maintain required bandwidth in case of congestion.
Moreover, to guarantee on-time
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