Routing Protocol Design And Implementation For Multi-Interface Wireless Mesh Network

Wireless Mesh Network is the key point of broadband wireless access technology. It can achieve region-wide wireless coverage,enhance the network capacity and connectivity,improve the system survivability and self-healing capability.In a building,home,campus,community,enterprise networks and metropolitan area network,wireless Mesh network has wide application prospects.In this paper,we study routing protocols of wireless Mesh network,then implement and verification them on platform.Firstly,we survey routing algorithm of a single-interface Mesh network,then implement routing protocols of AODV and DSR on platform.This Mesh platform can provide us with wireless access,video surveillance and some other services. Experiment results demonstrate that the path throughput will decrease rapidly as the number of Hops increases.Because in a single interface Mesh network,all links are working on the same interface,which causes serious interference.In multi-interface wireless Mesh networks,each Mesh router has multiple interfaces,and different interfaces work in mutually orthogonal channel.We design an effective multi-interface wireless Mesh network routing protocol,which can balance the network traffic through different interfaces,effectively reduce network interference and enhance capacity.This paper firstly propose a routing algorithm called minimum route interference,this metric take into account the intra-flow interference and select the minimum interference path to transmit data.NS-2 simulation results show that the algorithm can effectively improve the network performance.Secondly we propose a routing algorithm based on channel similarity, the number of hops,load,as well as inter-channel interference.Simulation results show that the algorithm can effectively improve the multi-interface wireless Mesh network throughput.Finally,we propose HCRL routing algorithm for multi-interface wireless Mesh network,which considers path hop(HOP),the channel similarity(CSI), received signal strength indication(RSSI).link residual capacity(LRCL) to select path.HCRL routing protocol has conbined the advantage of proactive and on-demand methods to find route,can achieve source routing based on table-driven,and support multi-gateways.As the measurement results show,HCRL routing algorithm can effectively improve the network performance,even in the condition of heavy load,the algorithm still can find a good path and balance the load in different interfaces.