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International Journal of Digital Multimedia Broadcasting
Volume 2013 (2013), Article ID 319594, 20 pages
http://dx.doi.org/10.1155/2013/319594
Research Article

Performance Evaluation of Concurrent Multipath Video Streaming in Multihomed Mobile Networks

Centre for Audio-Visual Communications and Networks, School of Computing, University of the West of Scotland, Paisley PA1 2BE, UK

Received 30 December 2012; Revised 9 July 2013; Accepted 15 July 2013

Academic Editor: Fabrice Labeau

Copyright © 2013 James Nightingale 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

High-quality real-time video streaming to users in mobile networks is challenging due to the dynamically changing nature of the network paths, particularly the limited bandwidth and varying end-to-end delay. In this paper, we empirically investigate the performance of multipath streaming in the context of multihomed mobile networks. Existing schemes that make use of the aggregated bandwidth of multiple paths can overcome bandwidth limitations on a single path but suffer an efficiency penalty caused by retransmission of lost packets in reliable transport schemes or path switching overheads in unreliable transport schemes. This work focuses on the evaluation of schemes to permit concurrent use of multiple paths to deliver video streams. A comprehensive streaming framework for concurrent multipath video streaming is proposed and experimentally evaluated, using current state-of-the-art H.264 Scalable Video Coding (H.264/SVC) and the next generation High Efficiency Video Coding (HEVC) standards. It provides a valuable insight into the benefit of using such schemes in conjunction with encoder specific packet prioritisation mechanisms for quality-aware packet scheduling and scalable streaming. The remaining obstacles to deployment of concurrent multipath schemes are identified, and the challenges in realising HEVC based concurrent multipath streaming are highlighted.