Video-aware opportunistic network coding over wireless networks

Authors:
Hulya Seferoglu;Athina Markopoulou
Affiliations:
Department of Electrical Engineering and Computer Science at the University of California, Irvine;Department of Electrical Engineering and Computer Science at the University of California, Irvine
Venue:
IEEE Journal on Selected Areas in Communications - Special issue on network coding for wireless communication networks
Year:
2009

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Abstract

In this paper, we study video streaming over wireless networks with network coding capabilities. We build upon recent work, which demonstrated that network coding can increase throughput over a broadcast medium, by mixing packets from different flows into a single packet, thus increasing the information content per transmission. Our key insight is that, when the transmitted flows are video streams, network codes should be selected so as to maximize not only the network throughput but also the video quality. We propose videoaware opportunistic network coding schemes that take into account both the decodability of network codes by several receivers and the importance and deadlines of video packets. Simulation results show that our schemes significantly improve both video quality and throughput. This work is a first step towards content-aware network coding.