An Efficient Multicasting for Multi-channel Multi-interface Wireless Mesh Networks
نویسندگان
چکیده
Multicasting can be an effective routing service in wireless mesh networks (WMNs), which have gained significant acceptance in recent years due to its potentials of providing a low-cost wireless backhaul service to mobile clients. Many applications in WMNs require efficient and reliable multicast communication, i.e., with high delivery ratio but with less overhead among a group of recipients. However, in spite of its significance, there has been little work on providing such a multicast in mesh networks. Traditional multicasting protocols for wireless multi-hop networks mostly assume that all nodes (equipped with a single interface) collaborate on the same channel. The single-channel assumption is not always true for WMNs that often provide the nodes with multiple interfaces for the purpose of substantial performance enhancement. In multichannel/interface mesh environments, the same multicast data need to be sent multiple times by a sender node if its neighboring nodes operate on different channels. In this paper, we try to tackle this challenging issue of how to design a multicast protocol more suitable for multiinterface and multi-channel WMNs. Our multicasting protocol builds multicast paths while inviting multicast members, and allocates the same channel to each of neighboring members in a bottom up manner. This mechanism may reduce message overheads and delivery delays while guaranteeing successful message deliveries. For the performance evaluation, we have implemented the proposed scheme on a real multi-channel/interface mesh network test-bed with two IEEE 802.11a cards per node.
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