Research Of Routing Protocols Of Ad Hoc Networks And NS2 Simulations

Wireless Ad Hoc networks composed of mobile terminal nodes with wireless communication device are typically characterized by their multi-hop,temporary and un-center,can be quickly built up in anywhere and at anytime,needn't be supported by basic network devices which have been constructed,and every terminal can move freely and equally. Considering the moving of nodes in Ad Hoc networks and constantly variety of network topology,the routing protocols such as RIP,OSPF etc used in traditional Internet can be not adapted to the need of Ad Hoc networks in fact, at the same time, due to the compute-capability of mobile nodes and storage-capacity are low and the energy sources are limited, so the routing protocols have to be simple as best.All those add the difficulty to routing protocol design in Ad Hoc networks. In the past twenty years, many researchers put forward a series of routing protocols for Ad Hoc networks. So implement and simulation of those routing protocols have been the important issues for Ad Hoc researchingrouting protocol.Firstly, this paper describes the basic characteristic of Ad Hoc networks, and introduces the existing unicast and multicast routing protocols in detail,and implements those typical unicast routing protocol, and then analyses and simulates them used by NS2, On the basis of broadcast-relay technology, a common improving method on existing unicast and multicast routing protocols based on flooding-mechanism is proposed, a new AODV-MPR protocol based on AODV is implemented, and analyses and simulates it by NS2.At the same time, implements and improves the multicast routing protocol MAODV. On the foundation of comparing the existing algorithms, NS2 is used to analyze their performance. The study shows that the new algorithms are more efficient. Finally, conclusions of this paper and suggestions for future research are given.This article has eight chapters as below.Chapter 1 introduces the concept of Ad Hoc networks, the history, characteristic , research hotspot, future application of Ad Hoc networks are simply present, also introduces the source and research meaning of this article, the working and innovation of this paper are given at last.Chapter 2 describes detailedly the basic principle of Ad Hoc unicast routing protocol.Chapter 3 introduces detailedly basic principle of the multicast routing protocols in Ad Hoc networks.Chapter 4 brings the concept of network simulator, emphasize introduces the free software NS2 and its utilities.Chapter 5 implements some typical unicast routing protocols of Ad Hoc networks such as AODV, DSR, DSDV, TORA etc, simulates and analyses the performance of them with NS2 .Chapter 6 expatiates routing protocol base on flooding-mechanism, then put forward a common improving method to existing unicast and multicast routing protocols based on broadcast-relay principle,at the same time,discusses and compares the AODV-MPR algorithms with AODV,then implement the AODV-MPR protocol,at last,simulates it in NS2 and the results show that it was more efficient than the traditional algorithms.Chapter 7 MAODV protocol which is in the stage of Draft proposal in IETF standardization process and a candidate for RFC (Request For Comment). In the author's work, found that there are some improvements to MAODV Draft proposal, and some advise are given,and the new improving MAODV protocol is implemented,The experimental results show that the algorithms proposed above was more efficiency.Chapter 8 summarizes this paper, at the same time,suggestions for future research are given.This paper is supported by National Natural Science Foundation of China (Projects No: 90304018).