Issue No. 12 - December (2007 vol. 6)
DOI Bookmark: http://doi.ieeecomputersociety.org/10.1109/TMC.2007.1063
Multi-hop networks provide a flexible infrastructure that is based on a mixture of existing access points and stations interconnected via wireless links. These networks present some unique challenges for video streaming applications due to the inherent infrastructure unreliability. In this paper, we address the problem of robust video streaming in multi-hop networks by relying on delay-constrained and distortion-aware scheduling, path diversity and retransmission of important video packets over multiple links to maximize the received video quality at the destination node. To provide an analytical study of this streaming problem, we focus on an elementary multi-hop network topology that enables path-diversity, which we term "elementary cell". Our analysis is considering several cross-layer parameters at the physical and medium access control (MAC) layers, as well as application-layer parameters such as the expected distortion-reduction of each video packet and the packet scheduling via an overlay network infrastructure. In addition, we study the optimal deployment of path diversity in order to cope with link failures. The analysis is validated in each case by simulation results with the elementary cell topology, as well as with a larger multi-hop network topology. Based on the derived results, we are able to establish the benefits of using path-diversity in video streaming over multi-hop networks, as well as identify the cases where path diversity does not lead to performance improvements.
B.4.3.h Wireless systems, H.5.1 Multimedia Information Systems, H.5.1.g Video, Multi-hop Networks, Distortionaware Path Diversity, Cross-layer Design
Mihaela van der Schaar, Xiaolin Tong, Yiannis Andreopoulos, "Distortion-Driven Video Streaming over Multihop Wireless Networks with Path Diversity", IEEE Transactions on Mobile Computing, vol. 6, no. , pp. 1343-1356, December 2007, doi:10.1109/TMC.2007.1063