Research On Channel Assignment And Routing Algorithm In Cognitive Wireless Mesh Networks

Cognitive Wireless Mesh Networks becomes a hot research owning to its unique advantages such as large network capacity, wide coverage and high spectrum efficiency. Channel assignment and routing algorithm are important key technologies for the cognitive wireless mesh networks. This topic is based on the subprojects of the National Natural Science Foundation and the Major National Science and Technology, and has important theoretical significance and promising application prospects.Comparing with the traditional wireless networks, cognitive wireless mesh networks requires a jointly consideration of the available channels and the routing selection. However, the available channels vary with time, space and PU’s behavior, which are distributed over a wide frequency range. So how to allocate channel to enhance the route stability in cognitive wireless mesh networks becomes a serious problem.After the thorough research on the characteristics, architecture and key technologies of cognitive wireless mesh networks, the paper emphasis on routing algorithm with dynamic spectrum access. To deal with the problems such as inadequate routing metric, neglect of the channel information and separation in channel assignment and routing algorithm, we propose a routing algorithm which makes fully use of the available channel information from the nodes as a new routing metric. Our algorithm selects the route with more stable nodes to improve the stability of the link. Theoretical analysis and simulation results show that, comparing with the current routing algorithms on multi-channel multi-interface wireless mesh networks, the proposed algorithm has a better performance in stability and system delay.In addition, this paper also primarily discusses the application of cognitive wireless Mesh network in military communications.