Research Of Channel Assignment Method On Multi-channel Wireless Mesh Networks

Multi-channel wireless Mesh network has been successfully applied to schools, businesses. It greatly improves the existing wireless network bandwidth. In a small network environment, performance of single-channel network is good. But as the node density increasing, the network load will increase dramatically. Multi-channel exponentially increases the bandwidth of the network. It meets the growing demand for wireless bandwidth services.In terms of multi-channel wireless Mesh networks, rational assignment of the channel is the key to improve network performance. There are three multi-channel assignment strategies:static channel assignment strategy, dynamic channel assignment strategy and hybrid channel assignment strategy. Static channel assignment strategy often can not adapt to changes in network topology. Theory of hybrid channel assignment strategy is inadequate. In large and complex network environments, dynamic channel assignment strategy can be switched dynamically as needed to an available channel for data transmission, effectively avoiding phenomenon of part of the channel is idle and another part of the channel is congestion. For dynamic channel allocation strategy, it is hard that each node in the network want to know the all information of the entire network topology. The entire network needs to spend a high price to broadcast and update information of nodes. Therefore, we choose Correlated Equilibrium (CE) theory which only considers associated with the node device and neighboring nodes and probability theory that the more times an event occurs, then the probability of the event occurring is greater. When an available channel is often occurs, the probability of the channel being used is also greater. On this basis, a set of nodes is established. Based on neighbor nodes, the available channel of neighbor nodes was recorded. The available channel list of neighbor nodes is based on the available channels set of the neighbor nodes. It counts the number of the available channels of the neighbor nodes. Finally, according to principle of the fewer number, the higher priority, available channel priority queue is established. The best available channel is selected to transmit data.In the actual environment, the most direct impact of various disturbing factors which caused by the outside of wireless network is that data packet loss rate remains high in data transmission. Thus, according to the requirements of practical engineering applications, it is necessary of setting a packet loss rate threshold to prevent the loss of important information. Therefore, based on the packet loss rate, channel packet loss rate that in a unit time data unsuccessful transmission number percentage of total number of data transmission is proposed. According to the channel packet loss rate, a lower loss rate of the channel is chosen to transmit data, reducing the number of data transmission failures, thereby increasing the overall throughput of the network.In NS3 simulation environment, the simulation of proposed scheme has been done. The simulation results show that the average throughput is increased by 5.2% than the existing algorithm.