The Research Of Channel Assignment Optimization In Emergency Command Mesh Network

Wireless Mesh network is a high-rate, high-capability and multi-point to multi-point network. Wireless Mesh network is received more and more attention due to their characters of no network administration and infrastructure. The characters of flexible structure, convenient configuration and efficient fault-tolerance capacity in wireless Mesh network accord with the requirements of wireless communication to the tasks of Goermnt well. Emergency Command Mesh Network is a new generation communication network which is designed for the actual demand of Govermnt e. It evolves from the traditional Wireless Mesh Network. The research of this paper is based on the Research on the Key Technology of Emergency Command Mesh Network.At present, the technology of multi-interface and multi-channel is a focus of WMN. Some studies indicate that the technology of multi-interface and multi-channel can improve the performance of the network greatly. With the application of this technology, there are some new problems in the research of WMN. For example, WMN with multi-interface and multi-channel is prone to be interfered by other same frequency channel inside or outside the network, which reduces throughput and stability of the network greatly. How we can effectively assign channels, which can reduce the interference, has already become a key technology of WMN and Emergency Command Mesh Network.Now, there are some researches on channel assignment. But they are not suitable for Emergency Command Mesh Network.Firstly, aiming at the quality of Emergency Command Mesh Network, this paper improves the Interference-Aware Channel Assignment in Multi-Radio Wireless Mesh Networks. In view of the principle that there should be minimum interference in high traffic link, we propose Traffic First Search Channel Assignment-I channel assignment model and algorithm. Secondly, based on Traffic First Search Channel Assignment-I channel assignment model, combining with the thinking of minimum link interference, we propose Traffic First Search Channel Assignment- II channel assignment model and algorithm. Thirdly, after fully thinking of the influence of two factors (the changing traffic of the network and the number of switching channel), we propose a measuring criterion of channel assignment which cooperates with the work of the two algorithms. Finally, we simulate them in NS-2 (Net Simulator 2). The result indicates that the two algorithms and measuring criterion of channel assignment can promote the throughput and stability of Emergency Command Mesh Network to some extent. They are suitable for Emergency Command Mesh Network.