Research On Wireless Ad Hoc Network Based On On-Demand Routing Technology

Ad hoc network is a kind of networks without central controlling. Nodes, which are routers in Ad hoc, move randomly and connect to each other to transfer and repeat the package. All nodes cooperate to complete routing discovery and routing maintenance. Traditional routing protocol is not suitable for Ad hoc network, because of its characters: adaptive, multi-hop, random moving and so on. So, it is very important to research routing protocols for Ad hoc network.This dissertation is based on military communication and the request of military communication for Ad hoc network. It analyze the ad hoc network technology especially network structure, researching status and some shortages for routing technology ,and the AODV routing protocol is also analyzed about its principle, characters and shortages. Then MAODV routing protocol are put forward by the author to improve some shortages of AODV. The MAODV routing protocol fully use the broadcast information from radio channel to establish backup routings. When the link is broken, the MAODV routing protocol repairs the link with backup routings instead of local repairing, that is used in AODV routing protocol. Package discarding is occurred when no backup routings exist in node cache, and a route error message is send to source node, then a new routing discover process will begin.A simulation is done between MAODV and AODV with software. From the simulation results under different node speed, it indicates that MAODV could decrease the average of ETE delay and offer lower routing overhead effectively. MAODV can complete routing discovery, package retransfer and self-organize when the network topology is changed, MAODV routing protocol is useful to establish Ad hoc networks in military communication.