Improved Design Of AODV Routing Protocol Based On Congestion Awareness

In recent years,the wireless network which takes radio wave as the core transmission medium has evolved into a hot topic discussed by relevant scholars.It does not need to use cables or analyze the specific location of computers when communicating.With the rapid development of wireless access technology,people will be able to communicate with other individuals more conveniently in the future.Ad hoc network,cellular network and satellite network are the most popular wireless network models at present.Ad hoc network is a multi hop temporary autonomous system constructed by several wireless terminal transmitters.Ad hoc network is an autonomous system composed of mobile nodes.It has many characteristics,such as temporary,multi hop and so on.The routing technology of this network has been widely concerned by related scholars.For this kind of technology,the design of routing protocol and algorithm is the most important.The first chapter of this paper is the introduction,focusing on the research background,domestic and foreign research trends,research content and research purpose and significance.The second chapter is related to the concept part,focusing on the ad hoc mode and ad hoc network,ad hoc network application,ad hoc network structure,ad hoc network characteristics,AODV routing protocol.In the third chapter,we focus on the basic principle of AODV routing protocol and AODV Protocol message format,AODV route discovery and route maintenance mechanism;path stability optimization protocol optimization design(path stability optimization,node energy,path weight judgment,node packet transmission);criterion optimization protocol optimization design(criterion optimization protocol design principle,intermediate node forwarding optimization,improved routing criteria standard,improved Hello)Machine and criterion optimization protocol algorithm flow.The fourth chapter is the simulation test of path stability optimization and criterion optimization,focusing on the aodv-se protocol simulation test(simulation model construction,the impact of node density on routing performance,and the impact of traffic on routing performance)and criterion optimization protocol simulation test(simulation scenario construction,different CBR packet rate has different impact on network delay)The effect of connection pairs on network delay.In this paper,firstly,the ad hoc routing protocol is analyzed systematically,and then the comprehensive discussion on network congestion is carried out.Then,the routing protocol is optimized to solve the network congestion problem.In addition,this paper discusses two routing protocol optimization schemes,and analyzes the advantages of the improved protocol by simulation.This paper discusses the path stability optimization of AODV routing improvement protocol with path stability and network energy as the core.Firstly,the path stability and energy are calculated to determine the specific path weight,so as to optimize the communication stability and solve the energy hole problem.The simulation results show that the routing can greatly increase the network lifetime and the packet delivery rate to a certain extent.In addition,this study improves the path stability and optimization routing,so that it can also show good applicability to the ad hoc network environment.This is the direction of further research and improvement in the future.This paper discusses the optimization of improved protocol criterion based on AODV routing protocol.In the route discovery stage,the intermediate node chooses a reasonable processing method for the routing request message according to the congestion level.If the congestion situation of the node is very serious and the energy is relatively small,there is no need to forward RREQ messages.The Hello message detection mechanism is optimized to flexibly adjust the broadcast hello The message interval reduces the consumption of network resources to a certain extent.In a variety of simulation environments,the practicability of the criterion optimization protocol is verified.The final results show that it optimizes the network performance index and alleviates the network congestion problem.