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Advances in Multimedia
Volume 2012, Article ID 319785, 9 pages
http://dx.doi.org/10.1155/2012/319785
Research Article

Distortion-Based Slice Level Prioritization for Real-Time Video over QoS-Enabled Wireless Networks

School of Computer Science and Electronic Engineering, University of Essex, Colchester CO4 3SQ, UK

Received 29 April 2012; Revised 22 June 2012; Accepted 22 June 2012

Academic Editor: Martin Reisslein

Copyright © 2012 Ismail A. Ali et al. 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

This paper presents a prioritization scheme based on an analysis of the impact on objective video quality when dropping individual slices from coded video streams. It is shown that giving higher-priority classified packets preference in accessing the wireless media results in considerable quality gain (up to 3 dB in tests) over the case when no prioritization is applied. The proposed scheme is demonstrated for an IEEE 802.11e quality-of-service- (QoS-) enabled wireless LAN. Though more complex prioritization systems are possible, the proposed scheme is crafted for mobile interactive or user-to-user video services and is simply implemented within the Main or the Baseline profiles of an H.264 codec.