Broadcasting in Multi-Radio Multi-Channel and Multi-Hop Wireless Networks

Multi-radio multi-channel multi-hop wireless networks have recently received a substantial amount of interest. An important question in multi-radio multi-channel networks is how to perform efficient network-wide broadcast. However, currently almost all broadcasting protocols assume a single-radio single-channel network model. Simply using them in multi-channel environment without careful enhancement will result in unnecessary redundancy. In this paper, we propose a general model of the broadcasting problem under multi-channel environment and show the efficient broadcasting problem is NP-hard. Then we reduce the problem into the minimal strong connected dominating set problem of the interface-extend graph which extends the original network topology across interfaces. Using interface-extend graph, we describe our MultiChannel Self-Pruning broadcast protocol and simulation shows that our protocol can significantly reduce the transmission cost.