MIMO-Cast: A Cross-Layer Ad Hoc Multicast Protocol Using MIMO Radios

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Executive Summary

IEEE 802.11 MAC does not use RTS/CTS exchange in multicast/broadcast mode. This may cause throughput loss and packet collision by hidden terminals. The authors propose a new cross-layer ad hoc multicast protocol, named MIMOCAST, to improve efficiency of IEEE 802.11 MAC. MIMOCAST builds a multicast tree on-demand by using control packets exchange. To reduce duplicated transmissions, MIMO-CAST employs Multi Point Relay with which only designated nodes forward packets and all nodes in the network hear those packets.

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