Research On Multipath Routing In Wireless Mesh Network

Wireless Mesh Network (WMN) is a new type of broadband wireless network structure. It can beregarded as the integration of WLAN and mobile Ad Hoc network, and plays the advantages of both.It is also one of the important techniques of the next generation wireless network4G. Routing protocolhas significant impact on the performance of WMN. The routing protocol providing high quality andhigh efficient communication is the key to ensure the operation of the network. Therefore, study ofrouting protocol suitable for WMN has great significance both in theory and practical application.Firstly, this paper makes a study and analysis on WMN, and emphatically introduces the keyproblems of multipath routing, some typical multipath routing, the method of load detection and loadbalance scheduling algorithm.Second, this paper proposes a load aware multipath routing suitable for WMN——LA_AOMDV.It defines a load aware routing metric which takes the link quality and node load into considerationsimultaneously and selects the path according to the metric. Meanwhile, in the phase of routediscovery it uses the access control mechanism to avoid congestion regions being formed. In theperiod of data forward it utilizes the load monitoring mechanism to load balance dynamically.Third, this paper analyses the damage of packets disorder caused by multipath forward andproposes a multipath forward algorithm——LA_AOMDV with MF which can avoid the problem ofdisorder. When there are many available paths, it selects the next hop according to the availablebandwidth and link load. Meanwhile, in order to ensure that the packets in the same flow aretransmitted on the same path it uses the Hash table to record the forward path. Therefore, It can selectthe path quickly and efficiently when packets arrive and the bandwith resources are fully utilized.Finally, LA_AOMDV and LA_AOMDV with MF are simulated in NS2network simulator. Theexperimental results show that the improved protocols have excellent performance in promptingnetwork throughputs and reducing end-to-end delay, etc.