Research And Simulation Of On-demand Routing Protocol Of Mobile Ad Hoc Network

MANET is abbreviated of mobile Ad hoc networks, and it is composed of mobile nodes with wireless communication devices are typically characterized by their multi-hop, temporary and un-center. Each node in the network also acts as a router, forwarding data packets to other nodes. How to communicate with each other is one of the key issues in Ad hoc networks.The thesis mainly studies On-Demand routing protocol in Ad hoc netwoks. In view of the energy-aware of MANET, this thesis does some research on routing protocol of energy-conservation. The main work and innovation illustrates the following aspects.1) This thesis researches on the routing protocol and technology of MANET, and it focuses on some typical routing protocols: AODV (Ad hoc On-Demand Distance Vector Routing), DSR (Dynamic Source Protocol), DSDV (Destination Sequenced Distance Vector), and then analyzes these protocols' advantages and disadvantages. Because routing protocol has different performance under different network environment, this thesis chooses the packet delivery fraction, average end-to-end delay of data packets and normalized routing load to simulate these protocols in just network environment through using NS2(Network Simulation of two version). The simulation result shows that these protocols have different performances under different cases and each protocol has its suitable condition.2) As result of the energy-aware of MANET, this thesis designs and realizes a new protocol PE-AODV (Path based on energy of AODV) which is based on energy by improving the protocol of AODV. The protocol of PE-AODV classifies the nodes into three kinds according to the remaining energy, and different kinds of nodes use different strategies of route delay to process the routing request packets. It avoids these nodes whose remaining energy is too little, and then prolongs the lifetime of the network.3) Through research on the protocol about energy-aware, this thesis suggests a new energy conservation model, and uses a forecasting mechanism in PE-AODV which forecasts the expiration link, then utilizes a new link to protect the data transmitting.4) We implement the protocol of PE-AODV and analyze the code of AODV, and then simulate it by using NS2 with in such aspects of the packet delivery fraction, average end-to-end delay of data packets, normalized routing load and network lifetime and so on. The simulation result shows that the performance of PE-AODV is better than that of AODV.