In Manet Aodv Routing Protocol Analysis And Research

Mobile Ad Hoc network is a temporary,multi-hop path and self-organized network composed by a group of wireless communicators in by itself.The network nodes assume the router function,it does not need the support of fixed infrastructure and each mode can move freely and realize the dynamic link quickly at any place and any time.Characterized by its flexible networking,outstanding viability function and needless fixed infrastructure,it is widely used in special circumstances such as battlefield environments and disaster rescue situations,also in multimedia application domain,and is generally considered to have a good prospect for development.Routing protocol is an important part of the MANET network,and it is also the major factor that affects the overall performance in the network.It has become the hot and difficult problem in the research field.Because traditional fixed network routing protocol does not adapt to the dynamic changes of MANET network topology,special routing protocols should be designed for MANET.In recent years,it has enacted a series of special routing protocols applicable to MANET network such as DSDV,DSR,and AODV.In reference to related literatures and full analysis of every protocol,through the comparison with the initiative routing protocols, on-demand routing protocol is regarded as the more suitable for MANET network.This paper will give further analysis and study on AODV.First this paper will give thorough research on AODV routing protocols,analyze its frame format and network protocol processing mechanism and network application.On this basis, according to the deficiencies of AODV routing protocol,it proposes suggestions for improvement.AODV protocol using radio a RREP HELLO message which the TTL value is 1 to detect the existence of neighboring nodes and to verify the reach ability of link in using.It will be considered a failure if the nodes did not receive any information of neighboring nodes by certain valid link(including hello message) at particular period of time(numbers of consecutive HELLO_INTERVAL),in this situation,it will send wrong routing information to related nodes, in order to update the routing nodes,avoid invalid transmission and reduce the delay by generating new routing.On the basis of this mechanism,this paper expand some developments, constructing hello message with the adjacent nodes list while in the routing table cache "double jump by the node list",to record node DLT double jump of adjacent node.Thus the nodes can comprehend its distribution and routing information in the range of double jump accurately,and help to extend the range from single to double jump.Adopting this mechanism it can realize the fast restoration of the demanding routing,and enable the breaking link which caused by nodes moving to get expected repair without back to resource nodes.In this process it also can realize the active notice of short routing,providing reference for routing optimization,accelerating constringency of it,and saving the delay of routing found.At last,by NS2 simulated experiment testing,expecting to achieve some improvements in data sending rate,time delay,the throughput and protocol cost.This paper mainly focuses on these three factors:1.On the basis of overall understanding of the network and several typical MANET routing protocols,this paper gives priority to the research of AODV on-demanding routing protocols.2.According to the deficiency of AODV protocol,this paper puts forward to the improved UH-AODV protocol and introduces the key protocol mechanism of c++ code realization.3.Simulation scripts and models are finished based on thorough study on NS2.And also comparisons and analysis are made for AODV and UH_AODV respectively.