Reseach On Wireless Ad Hoc Special Communication Network Routing Protocol

The wireless Ad Hoc network is a sort of network with some nodes assembled to forming an unmaned to interfere,multihop,nonprepared establishment and selforganization, it carries out link each other in the certain range with mobile terminal nodes.military correspondence is one of the most important application environment for the ad hoc network, particularly in the environment of battlefield, request to build up flexibility and split conveniently for the correspondence network, have stonger anti- ruin and viability,lower transmit delay and routing overhead ,higher packet delivery fraction etc. Focuse on this problem ,the thesis has reseached on some problems to IM the routing performance of Ad Hoc network in the special environment.This thesis begins with the foundation concept of wireless Adhoc network first, the synopsis introduced the classification of Adhoc network routing protocol and four kinds of single path protocol. deeply introduced the principle of NS2 and the method to simulation. And four typical single path routing protocols, AODV,DSR,DSDV and TORA, are compared and analyzed with NS2. And the conclusion is that the on-demand routing protocol more than the table driven routing protocol suit for Adhoc network.Because AODV combines the advantages of DSDV and DSR then except AODV to be the deeply study object.After deeply analyzing AODV algorithm of on-demand protocols, focusing on the problem of the broken link bring the unstabilization and uncredibility of routing,the multipath protocols algorithm called AOMDV is proposed. Multipath routing protocol could set up more efficiency routings through the flood once time, so it can reduce the times of flooding, at the same time multipath routings could improve the utilize rate of bandwidth,packet delivery and reduce the routing overhead. The problem of AOMDV is not to mainten the spare routing actively, the route usually broken when needed. In order to solve the unstabilization and discredibility of multipath, paper present an adaptive multipath routing (IM-AOMDV). Modify the rule of request and reply, multipath routimg are maintained during the update news,and the news measure the energy strength of each hop along the link,and choose the strongest energy of the path for transmiting the data. The standard of choosing routing by the hops before is changed by This method, because the hops can not explain the credibility of the routing.it is very significant for the IMment of wirelesss network performance.