Research On Multipath Routing Protocol For UAV Ad Hoc Network

With the development of research on wireless Ad hoc network and multi Unmanned Aerial Vehicle(UAV)cooperative combat,UAV Ad hoc network has become a new research hotspot.High speed mobility of nodes and high dynamic network topology in complex battlefield environment have posed new challenges to the communication networking technology of UAV Ad hoc network.The key technologies of multi-path routing protocols are studied to address the shortcomings of existing multi-path routing protocols for mobile Ad hoc networks in guaranteeing path stability and balancing network load in this paper.The specific work is as follows:Adoption of mobile ad-hoc network mode,this paper studies and analyzes the problem of link breakage and poor path stability caused by high-speed mobile nodes with Ad hoc Multipath Distance Vector(AOMDV)in UAV Ad hoc networks.A model of UAV Ad hoc networks is constructed,combined the characteristics of node mobility in three-dimensional space and the lifetime of communication links.And a multipath routing protocol named Unmanned Aerial Vehicle Ad hoc On-demand Multipath Distance Vector(UAV-AOMDV)in UAV Ad hoc networks is studied.In this protocol,path survival time is adopted as the criterion of path selection.The research results show that UAV-AOMDV protocol can reduce the times of route discovery to a certain extent,ensure the path stability and decrease the packet transmission delay.In view of the deficiency that AOMDV only uses the main path in data transmission without considering employ multiple paths to achieve network load balancing,this paper studies the multi-path traffic allocation strategy of UAV-AOMDV.The node load coefficient is used to measure the load degree of node.The link load coefficient calculated by the load coefficient of the connected nodes represents the load degree of link,and the maximum link coefficient determines the path load coefficient.BALANCE message is designed to maintain the load information of different paths.Then routing criteria are updated according to the path load coefficient and path characteristics.Path with low load,long lifetime and few hops is selected to transmit data packets,dynamic allocation the traffic of different path,alleviation the congestion of network and maximize guarantee utilization of network resource.Finally,the simulation platform of UAV Ad hoc network is built by MATLAB to carry out simulation verification for UAV-AOMDV.On the basis of the high-speed mobility of nodes,UAV Ad hoc network communication model is designed,including the communication protocol model of network layer and link layer,node mobility model.The feasibility and performance of the protocol are evaluated under different node number and different node mobility scenarios.The simulation results show that when the number of nodes is 80,compared with AOMDV,the packet delivery ratio of UAV-AOMDV increases by 14.9% and the transmission delay decreases by 9.19%.When the mobile speed of nodes is 100 m/s,the packet delivery ratio of UAV-AOMDV is 17.7% higher than that of AOMDV,and the endto-end delay is reduced by 12.9%.This protocol studied in this paper can use parallel-path to transfer data packets,decrease the number of routing discovery,reduce the possibility of network congestion and achieve network load balancing.