To Improve The Research And Implementation Of The Maodv Routing Protocol Based On The Multicast Tree

Mobile Ad Hoc network is a wireless mobile network which works in the unstructured and self-organization environment and has applications in a wide range of areas including disaster relief and military. For example, to initiate and promote rapid battlefield forces, help the army deploying or going forward in the battlefield, and the rescue after earthquakes or floods. In the absence of network infrastructure, Ad Hoc networks can be rapidly deployed, each node in the network can move as both a server and a router. The Ad Hoc network can organize fast, flexibly, and can still work if there is no wire circuitry, it will be used broadly.This thesis describes the structure of Ad Hoc network first, focuses on the study of route technology which is the key technology in Ad Hoc especially. The paper introduces 3 route protocols: DSR(Dynamic Source Routing),AODV (Ad Hoc On-demand Distance Vector ),TORA (Temporally-Ordered Routing Algorithm) .The paper also mentions Results of the 3 protocols and makes a particular analysis.In fact, some networks may need multicast routing only and not need unicast routing at all. This makes multicasting a very important feature in such networks. As a result, it is important to have a multicasting protocol that provides a high packet delivery ratio even in extreme conditions (e.g., high mobility and high traffic load). It is equally important for such protocols to have a low overhead, because bandwidth and battery power are extremely precious in these kinds of networks.At last, concerning DSR,AODV,TORA are Unicast On-demand routing protocols, they are of higher delay ,the higher frequency of flood , the lower packets delivery ratio than Multicast routing protocol. So, we bring forward the conception of the Multicast routing. With the study a research of Multicast routing, we introduce a Multicast routing protocol-MAODV, which developes from AODV. Using MAODV protocol as the routing protocol in Adhoc.Also, we improve some detals of the MAODV and develop a new protocol, MAODV-R. We can reduce the network delay, enhance the packets delivery ratio and reduce the frequency of flood. We simulate MAODV and MAODV-R in NS-2, and offer referrence to study Ad Hoc network.