Research On The Parallel Routing Mechanisms And Methods Based On AOMDV

Mobile Ad Hoc networks(MANETs)are collections of wireless nodes that can communicate with each other without any infrastructure.In the network architecture of Ad Hoc,each network node has the advantages of non-infrastructure,high dynamic,wireless communication and high coverage of multi-hop transmission.It has a very wide application prospect in military application and disaster rescue.However,MANET itself has the characteristics of high dynamic,multi-hop transmission and limited energy,which makes the reliable transmission of MANET become a difficult problem.As a result,routing in the MANET network is a challenging task.When the nodes in the network topology move frequently,the typical routing protocols can not run effectively and it takes a long time to be restored to a steady state.This paper analyzes the existing routing protocol in the mobile Ad Hoc network and the AOMDV routing protocol modified based on the AODV.However,the AOMDV protocol data transmission is carried out on the main path and the secondary path will only be used after the main path is disconnected to transmit.Based on the idea of ARPA network dispersity routing proposed by Maxemchuk[13] and combining with the idea of dispersity routing,this paper puts forward the idea of sending packets out on different routes on the foundation of AOMDV routing protocol.In this paper packet fragmentation scheme uses a secret shared threshold algorithm,where the data packet is divided and added with part of the redundancy,the receiver can restore the packet without the need to receive all the data fragments.So that this algorithm can guarantee the complete receipt of the packet in the Ad Hoc network with frequent movement and easy disconnection.This paper is mainly contributing include the following three aspect: 1)completing the node disjoint AOMDV multi-routing protocol simulation in the NS-3network simulator.In the grid topology,it is found that although there are two node-disjoint routs,only one route is found in the NS-3 simulator.Through the analysis it is found that some node in the NS-3 simulator is significantly faster than other nodes when forwarding protocol packets,causing some nodes to be shielded.For the problems of the NS-3 simulator,the AOMDV routing protocol is modified to block the discovered route during the route discovered process,that is,route discovery is carried again in the remaining topology until fouding the specified number of routes.The simulation results show that the number of node disjoint routes can be found in the topology;2)In the NS-3 simulator,the(3,2)parallel transmission is simulated,where3 is the number of the route,2 is the number of data fragments.The simulation resultsshow that half data of the packets is transmitted on each path,even if one of the three routes is disconnected,the receiver can still restore the packets.3)The comparison of different parallel transmission routing for different number of routing and number of packets show that the higher the redundancy is,the smaller the packet loss rate is in the condition of same sending period.However,if the packet fragmentation is too large,it will cause the jamming of the data fragments in the sending process,and the smaller the interval is,the higher the packet loss rate is,such as(2,1)dispersity routing,but this route dose not meet the propose secret sharing ideas.