Ad Hoc Routing Protocol Simulation And Optimization Techniques

Sensor network,which is made by the convergence of multiple sensors,wireless transceiver and network technologies,is becoming more and more popular in the domain of sensor and information aquiring.This network is based on the technologies of Ad Hoc network and has a variety of applications.Ad Hoc sensor network is essentially different from traditional wired network and wireless network, it works without any fixed base station or centralized administration.The nodes of this network can move randomly,which leads to the consistly changing of network topology. Individual mobile node cooperates with other nodes through wireless channels.This self-organized, highly dynamic network set high demand for designing routing protocols.Establishing and maintaining multihops of Ad Hoc sensor network is the kernel of routing protocol.The research of Ad Hoc routing protocols is the key of designing a new sensor network routing protocol.This dissertation classifies the many proposed Ad Hoc routing protocols into three types.One table-driven and three dominant on-demand routing protocols are theoretically analysed.Through the GloMoSim simulator,we establish an Ad Hoc network model,the four protocols are simulated comprehensively under different network environment.The results shows that on-demand protocols outperform table-driven protocols,and AODV outperforms other protocols in most environments.The ideas of AODV is most adoptable for wireless sensor networks.In order to enhance the performance of AODV routing protocol,this dissertation devises an optimized strategy which is based on local route repairing.Combing this strategy with AODV,we design a new routing protocol which is called AODV-LRR.Through specific simulation,the results demonstrate the merits of this strategy—it outperforms other on-demand protocols and largely reduced the routing control packets in large link-failure environment.