Research On Routing Technology For Wireless Mesh Network

Wireless Mesh, evolving from Ad Hoc network, is wireless version of Internet with comparative static characteristics. Featuring self-organization, self-configuration and self-healing, wireless Mesh is able to automatically organize each node into an Ad Hoc network and maintain its connectivity. It obsesses effective management and tracing mechanism of mobile users and has a broadband wireless network structure featuring multiple hops. Wireless Mesh is distributive network characterizing high capacity, high speed, low power consumption and low cost.In recent years, wireless Mesh technology has scored big points rapidly and is widely used in commercial sectors, being key part of technology in next generation wireless network. Despite of above mentioned merits, problems such as capacity and coverage enhancement, security, performance, power consumption, bandwidth fairness and multiple host choice, etc still exist which constrict its further development. Routing technologies being adopted is transplanted from Ad Hoc network due to lack of standard, therefore they don't fit wireless Mesh network well.After analysis on strength and weakness of existing routing protocols, this thesis presents a routing protocol with comparatively static property in line with wireless Mesh network's characteristics. We focus effort on routing technologies of wireless Mesh network which are as follows:①Research on common routing protocols of Mesh network, including proactive ones such as DSDV, WRP, GSR, etc; reactive ones: DSR, TORA, etc; hybrid routing protocols: ZRP.②Focus on the study of principles and implementation process of Ad-hoc On-demand Distance Vector Routing Protocol (AODV).③An improved Ad hoc On-demand Distance Vector based on Combined Metric routing protocol (CMAODV) is proposed through analysis on merits and weakness of ADOV. Instead of minimum hop count, we propose a combined metric substantially consist of node's load, available bandwidth and hops. Its main idea is that avoiding the node of heavy load, inducing the network's congestion, balancing network's flow. CMAODV add that the node of heavy load refuse route's forward, so induce route costs.④Conduct simulation and analysis against performance of CMAODV and compare with AODV. Results of simulation show that in wireless Mesh network, CMAODV is better than traditional AODV.