The Simulation Analysis And Research Of Multicast Routing Protocol Based On NS2 In Ad Hoc Networks

Mobile Ad Hoc network consists of a group of nodes which is a multi-hop autonomous system without infrastructures, and it is easy to deploy. Nodes in the same Mobile Ad Hoc network are peer to each other and have flexible mobility. As a result, it can be used both in civil and military applications. However, due to the mobility of nodes, bandwith and energy constrain, the multicast routing protocols in Mobile Ad Hoc network is different from conventional wired network and one-hop cellular wireless network.Multicast is defined as a communication approach in terms of one-point to multipoint or multi-point to multi-point. As we can see in typical applications of Ad Hoc networks, the communications among collaborated users in groups are usually under multicast mode so as to make more effective use of networking resources. By far, many multicast routing protocols have been proposed by researchers, e.g., realizable and highly effective MAODV(Multicast Ad Hoc On-Demand Distance Vector Routing Protocol), simple and robust ODMRP(On-Demand Multicast Routing Protocol) and so on. However, the current Ad Hoc multicast routing protocols can not provide effective multicast transmission. So, in this paper, we propose an optimized algorithm called as MAODV-MM (MAODV with Multipath Maintenance), which aims at improving MAODV routing protocol. MAODV-MM has two major novel points. Firstly, it optimizes the constructing algorithm of multicast trees to reduce the overhead appeared in tree-buildup and to minish broadcast flow in networks. Secondly, it introduces the multipath maintaining mechanism to enhance multicast routing robustness and reduce traffic during link's recovery by redundant broadcast messages.To evaluate the performance of MAODV-MM, we set up a simulator platform and implemente it in NS2. The simulator results shows that compared with MAODV our proposed algorithm increases 8% increase in packet delivery rate and reduces 6% in networking overhead.This paper is consisting of five chapters shown as follows:Chapter 1 introduces the background, definitions, development state and features of Ad Hoc, and some key techniques such as architecture, troubles in research. And then, it outlines the significant contribution of our work.Chapter 2 analyzes and compares some multicast protocols in Ad Hoc network, and then it leads to our conclusions of all these protocols.Chapter 3 describes our improved multicast routing algorithm in detail.Chapter 4 introduces the implementation of our proposed algorithm in NS2 and the performance comparisons among different algorthims.Chapter 5 gives our conclusions and the future research.