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Advances in Multimedia
Volume 2007, Article ID 94918, 11 pages
http://dx.doi.org/10.1155/2007/94918
Research Article

MOS-Based Multiuser Multiapplication Cross-Layer Optimization for Mobile Multimedia Communication

1Media Technology Group, Technische Universität München, München 80687, Munich, Germany
2DoCoMo Communications Laboratories Europe GmbH, Future Networking Lab, Munich 80687 2, Germany

Received 7 January 2007; Revised 30 April 2007; Accepted 5 June 2007

Academic Editor: Jianwei Huang

Copyright © 2007 Shoaib Khan 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

We propose a cross-layer optimization strategy that jointly optimizes the application layer, the data-link layer, and the physical layer of a wireless protocol stack using an application-oriented objective function. The cross-layer optimization framework provides efficient allocation of wireless network resources across multiple types of applications run by different users to maximize network resource usage and user perceived quality of service. We define a novel optimization scheme based on the mean opinion score (MOS) as the unifying metric over different application classes. Our experiments, applied to scenarios where users simultaneously run three types of applications, namely voice communication, streaming video and file download, confirm that MOS-based optimization leads to significant improvement in terms of user perceived quality when compared to conventional throughput-based optimization.