Authors: Mohammad H. Hajiesmaili; Mohammad Sadegh Talebi; Ahmad Khonsari
Addresses: School of ECE, College of Engineering, The University of Tehran, Iran, School of Computer Science, IPM, P.O. Box 19395-5746, Iran ' School of Electrical Engineering, KTH The Royal Institute of Technology, SE-10044 Stockholm, Sweden ' School of ECE, College of Engineering, The University of Tehran, Iran School of Computer Science, IPM, P.O. Box 19395-5746, Iran
Abstract: Rate adaptation of video signal for different quality-of-service scenarios through scalable video coding (SVC) standard has been considered as a key feature for multimedia transmission. This paper addresses joint multipath rate control and scheduling for SVC-encoded video transmission over wireless mesh networks (WMNs). Each video stream is assumed to use multipath routing and to possess a staircase utility function. Using the conflict graph that represents the interference-limited model, we formulate the problem as one of maximising the sum of source utilities subject to transport and link layers constraints. The multipath routing over wireless channels and staircase utilities yield a non-convex optimisation problem. To attain a convex formulation, we adopt multimodal sigmoid approximation and exploit utility-proportional fairness approach. Then, employing dual decomposition, we devise a distributed algorithm for joint multipath rate control and scheduling in WMNs. Experiments validate the effectiveness of our endeavor toward achieving cross-layer optimisation for video transmission in WMNs.
Keywords: wireless mesh networks; WMNs; SVC; scalable video coding; multipath rate control; scheduling; cross-layer optimisation; convex optimisation; rate adaptation; video signals; quality of service; QoS; video transmission; multipath routing; staircase utility function.
International Journal of Ad Hoc and Ubiquitous Computing, 2014 Vol.15 No.4, pp.239 - 251
Received: 18 Jan 2012
Accepted: 23 Dec 2012
Published online: 24 May 2014 *