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| Joint routing and rate allocation for multiple video streams in ad-hoc wireless networks |
| Zhu Xiao-qing, Singh Jatinder Pal, Girod Bernd |
| Information System Laboratory, Stanford University, California 94305, USA; Deutsche Telekom Laboratories, Ernst-Reuter-Platz 7, Berlin 10587, Germany |
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Abstract The support for multiple video streams in an ad-hoc wireless network requires appropriate routing and rate allocation measures ascertaining the set of links for transmitting each stream and the encoding rate of the video to be delivered over the chosen links. The routing and rate allocation procedures impact the sustained quality of each video stream measured as the mean squared error (MSE) distortion at the receiver, and the overall network congestion in terms of queuing delay per link. We study the trade-off between these two competing objectives in a convex optimization formulation, and discuss both centralized and distributed solutions for joint routing and rate allocation for multiple streams. For each stream, the optimal allocated rate strikes a balance between the selfish motive of minimizing video distortion and the global good of minimizing network congestions, while the routes are chosen over the least-congested links in the network. In addition to detailed analysis, network simulation results using ns-2 are presented for studying the optimal choice of parameters and to confirm the effectiveness of the proposed measures.
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Received: 09 December 2005
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