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Application-driven cross-layer optimization for video streaming over wireless networks

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5 Author(s)
Khan, S. ; Technische Univ. Munchen, Germany ; Peng, Y. ; Steinbach, E. ; Sgroi, M.
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Mobile multimedia applications require networks that optimally allocate resources and adapt to dynamically changing environments. Cross-layer design (CLD) is a new paradigm that addresses this challenge by optimizing communication network architectures across traditional layer boundaries. In this article we discuss the relevant technical challenges of CLD and focus on application-driven CLD for video streaming over wireless networks. We propose a cross-layer optimization strategy that jointly optimizes the application layer, data link layer, and physical layer of the protocol stack using an application-oriented objective function in order to maximize user satisfaction. In our experiments we demonstrate the performance gain achievable with this approach. We also explore the trade-off between performance gain and additional computation and communication cost introduced by cross-layer optimization. Finally, we outline future research challenges in CLD.

Published in:

Communications Magazine, IEEE  (Volume:44 ,  Issue: 1 )