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Advances in Multimedia
Volume 2007 (2007), Article ID 71458, 8 pages
http://dx.doi.org/10.1155/2007/71458
Research Article

Video Broadcasting Using Queue Proportional Scheduling

Wireless Telecommunications Laboratory, Department of Electrical and Computer Engineering, University of Patras, Rio 26500, Greece

Received 31 May 2007; Accepted 12 September 2007

Academic Editor: Tasos Dagiuklas

Copyright © 2007 Dimitris Toumpakaris and Stavros Kotsopoulos. 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.

Abstract

Queue Proportional Scheduling (QPS) has been shown to be throughput optimal for Gaussian Broadcast Channels. This paper examines the use of QPS for Video Broadcasting. First, the behavior of QPS is examined as the scheduling frequency is reduced and a method is proposed that uses statistics on the arrival rates to improve its performance. The reduction of the scheduling frequency simplifies the scheduler and decreases the required operations. Then, the packet delay variation is modeled using a Markov Chain approach leading to a method for approximating the packet delay distribution. Based on the resulting distribution, it is discussed how the video encoding rate can be chosen in order to reduce the expected distortion of streams transmitted through Broadcast Channels.