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Issue No. 01 - January (2011 vol. 10)
ISSN: 1536-1233
pp: 136-145
Wei-Kuo Liao , National Chiao Tung University, Hsinchu
Yi-Hsuan Lai , Hsuan Chuang University, Hsinchu
We propose a scheme called Type-Aware Error Control (TAEC) to provide robust interactive video services over time-varying wireless channels. Basically, TAEC explores the temporal dependence of video frames by pushing out the lower impact frames. In doing so, queuing delay is controlled and the important frame is retransmitted multiple times. We consider the application of the nonstationary stochastic control to further improve the wireless system throughput by exploring the multiuser diversity gain. The techniques involved in our proposed solution consist of constructing a Markov model, reducing the number of parameters estimated, and avoiding the state explosion problem. The provisioning of immediate bandwidth guarantee is another feature of TAEC, i.e., when exploring the multiuser diversity gain, the users share their reserved bandwidth only if the perceived video qualities are acceptable. As shown in the simulation, TAEC improves the perceived video quality in terms of luminance PSNR when compared to other schemes.
Video communication, real-time scheduling, wireless error control, nonstationary stochastic control.

W. Liao and Y. Lai, "Type-Aware Error Control for Robust Interactive Video Services over Time-Varying Wireless Channels," in IEEE Transactions on Mobile Computing, vol. 10, no. , pp. 136-145, 2010.
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