Research On Optimization Technology Of End-to-End Transmission Routing In MANET

Self-organizing networks can also be called MANET networks,which have the characteristics of no center,rapid networking,multi-hop routing.And can work without the support of communication base station The MANET(Mobile MANET Network)is an MANET network with movable nodes.With the diversification of communication requirements,it has demonstrated strong capabilities under some special environmental conditions Such as military command,emergency rescue,temporary meetings and so on.However,the node energy is limited.It can provide less bandwidth resources.And nodes will move randomly,how to find and maintain a reliable transmission path has become a hot and difficult research topic.In multipath routing protocol,multiple paths can be established to transmit data.Compared with the single path routing protocols,it has better performance in network reliability,time delay,load balancing and so on.Especially in the actual situation of frequent network topology changes,multipath routing has better network adaptability and expansibility.First classify and introduce the existing routing protocols according to their characteristics.Focus on selecting four classic protocols for simulation.The AOMDV routing algorithm has a single strategy in finding active routes The paper is ready to expand and optimize,.The article mainly proposes two improvements1.In view of the problem of data packet overflow and loss caused by some nodes in the network under high load for a long time,the nodes are classified according to the data queuing status,and the nodes and chains are dynamically updated by expanding the RREP(Route Reply)and Hello messages.For path status information,a new virtual hop number that combines forwarding hops and node load information is used to participate in path selection,which effectively reduces network transmission delay and increase data packet delivery rate.2.In view of the signal and link fading caused by the high dynamics of the MANET network topology,a prediction model is established to calculate the signal change,and the average non-fading time(Average Nonfading Duration,ANFD)is used to measure the fading status of the link.If the switching strategy is too large,the current link is switched to the backup link with better communication status,which effectively improves the network performance.Finally,the article also explores a method of using static weighting coefficients to combine the two improvements into a comprehensive cost function to adapt to different network requirements.Through the analysis of the protocol performance under the two coefficients,it is obvious that the coefficient pair synthesis Performance impact.