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Relay-Based Video Multicast with Network Coding in Multi-Rate Wireless Networks

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2 Author(s)
Lin, K.C.-J. ; Res. Center for IT Innovation, Taipei, Taiwan ; Szu-Ting Lee

The wireless broadcast nature enables a video source to multicast a stream to a group of mobile clients efficiently. However, since different clients might experience heterogeneous wireless channel conditions, the throughput of single-hop multicast schemes is bounded by the clients that experience a poor channel condition. This paper presents a relay-based video multicast scheme that allows the clients experiencing a better channel condition to select a suitable transmission bit-rate and relay data for neighboring poorly-connected clients. We first formulate a joint time-allocation and rate-selection model that allocates bandwidth resources to each relay node, and then propose a network-coding-based forwarding scheme to determine which video frames should be forwarded by each relay. Our evaluation results show that the proposed relay-based scheme can utilize channel bandwidth more efficiently, and, therefore, improve the average visual quality by up to 5dB as compared to single-hop multicast.

Published in:

Global Telecommunications Conference (GLOBECOM 2011), 2011 IEEE

Date of Conference:

5-9 Dec. 2011