MARS: Link-Layer Rate Selection for Multicast Transmissions in Wireless Mesh Networks

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Executive Summary

IEEE 802.11 devices dynamically choose among different modulation schemes and bitrates for frame transmissions. This rate adaptation, however, is restricted only to unicast frames. Multicast (and broadcast) frames are constrained to use a fixed low bit-rate modulation, resulting in low throughput for multicast streams. Availability of high bandwidth and efficient use of the medium is crucial to support multimedia multicast streaming applications such as IPTV, especially in multihop mesh networks. To address this problem, the authors propose a rate adaptation algorithm for multicast transmissions in these networks.

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