Threshold-Based Rate Control for Multimedia Transport over Markovian Wireless Channels

TitleThreshold-Based Rate Control for Multimedia Transport over Markovian Wireless Channels
Publication TypeConference Paper
Year of Publication2008
AuthorsSeo, J. - B., and V. C. M. Leung
Conference NameWireless Communications and Networking Conference, 2008. WCNC 2008. IEEE
Pagination2869 -2874
Date Publishedmar.
Keywordsbuffer thresholds, M/G/l queue, Markov processes, Markovian wireless channels, minimisation, multimedia communication, multimedia transport, optimal rate reduction factor, packet delay minimisation, packet radio networks, queueing system, queueing theory, source coding, source encoder, source rate control, threshold-based rate control, throughput degradation, wireless channels

In this paper, we examine source rate control (SRC) via multiple buffer thresholds over a Markovian wireless channel. In the SRC scheme, a multimedia source reduces its packet rate (thus degrading the encoding quality) gradually whenever the queue length exceeds certain thresholds. When the queue length drops below a specific threshold, the respective preset source rate is restored. The performance of this scheme is analyzed by defining a loss function of a source in the queueing system, which consists of packet dropping at the end of queue, the throughput degradation and the quality degradation by a source encoder. This function is evaluated by modeling the system as a level dependent M/G/l queue. Numerical examples are presented, which show that the loss function and average packet delay are minimized at an optimal rate reduction factor.


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