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Issue No. 01 - Jan. (2013 vol. 12)
ISSN: 1536-1233
pp: 21-34
Kate Ching-Ju Lin , Academia Sinica, Taipei
Wei-Liang Shen , Academia Sinica, Taipei
Chih-Cheng Hsu , National Taiwan University, Taipei
Cheng-Fu Chou , National Taiwan University, Taipei
ABSTRACT
Adaptation of modulation and transmission bit-rates for video multicast in a multirate wireless network is a challenging problem because of network dynamics, variable video bit-rates, and heterogeneous clients who may expect differentiated video qualities. Prior work on the leader-based schemes selects the transmission bit-rate that provides reliable transmission for the node that experiences the worst channel condition. However, this may penalize other nodes that can achieve a higher throughput by receiving at a higher rate. In this work, we investigate a rate-adaptive video multicast scheme that can provide heterogeneous clients differentiated visual qualities matching their channel conditions. We first propose a rate scheduling model that selects the optimal transmission bit-rate for each video frame to maximize the total visual quality for a multicast group subject to the minimum-visual-quality-guaranteed constraint. We then present a practical and easy-to-implement protocol, called QDM, which constructs a cluster-based structure to characterize node heterogeneity and adapts the transmission bit-rate to network dynamics based on video quality perceived by the representative cluster heads. Since QDM selects the rate by a sample-based technique, it is suitable for real-time streaming even without any preprocess. We show that QDM can adapt to network dynamics and variable video-bit rates efficiently, and produce a gain of 2-5 dB in terms of the average video quality as compared to the leader-based approach.
INDEX TERMS
Streaming media, Visualization, Heuristic algorithms, Schedules, Protocols, Bit rate, Scheduling, QoS, Wireless video multicast, rate adaptation
CITATION

C. Hsu, W. Shen, K. C. Lin and C. Chou, "Quality-Differentiated Video Multicast in Multirate Wireless Networks," in IEEE Transactions on Mobile Computing, vol. 12, no. , pp. 21-34, 2013.
doi:10.1109/TMC.2011.242
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