Load balancing for video streaming services in hierarchical wireless networks
Computer Networks: The International Journal of Computer and Telecommunications Networking
A receiver-based rate control scheme for streaming video over wireless
SMC'09 Proceedings of the 2009 IEEE international conference on Systems, Man and Cybernetics
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Providing continuous video playback with graceful quality degradation over wirelesschannels is fraught with challenges. Video applications require stringent delay guarantees and a relatively high throughput. Wireless channels are error prone, time varying,and bandwidth limited. To improve the reliability of the wireless link, forward errorcorrection (FEC) and automatic repeat request (ARQ) are often used. If designed forthe worst channel conditions, FEC can provide constant throughput and bounded delay. However, this causes unnecessary overhead and reduces the maximum achievablethroughput when the channel is in good conditions. On the other hand, it is difficult toachieve strict delay guarantees using ARQ schemes alone, especially when the channelis in deep fading. Playback buffer occupancy plays a major role in the target videoquality. The retransmission of erroneous packets and the reduction in throughput dueto FEC overhead can lead to playback buffer starvation as well as transmitter bufferfullness. Therefore, it is desirable to reduce the bit rate of the transmitted video signaland increase error protection when the channel is anticipated to be bad or the receiverplayback buffer starvation is predicted. In this study, we introduce a scalable andadaptive source-channel rate control scheme for video transmission over wireless packetnetworks. In this scheme, the level of adaptiveness is optimized to reduce the bandwidth requirement while guaranteeing delay and loss bounds. Simulation and numericalinvestigations are carried out to study the interactions among various key parametersand verify the adequacy of the analysis.