FANET Segmented Routing Design Based On Hybrid SDN Architecture

Flying Ad Hoc Network(FANET)has the advantages of easy deployment,flexibility,diverse functions,and low cost,so it is widely used in military and civilian.However,FANET has the characteristics of wireless self-organization,limited node energy,and high dynamic topology.Therefore,when using the 3-Dimensional Greedy Perimeter Stateless Routing(3DGPSR)which is widely used in this scenario,there will be some problems such as routing holes,limited network lifetime,and high packet loss rate.Software Defined Network(SDN),which is emerging in recent years,provides a feasible solution for solving the routing holes in FANET through the separation of control plane and data plane,programmable customization,and centralized control.Therefore,this article introduces the SDN architecture into FANET,focusing on key technologies such as low-overhead control,energy balance,and node movement prediction in SDN-FANET routing.The specific work is as follows:1.In view of the high cost of FANET routing control under the traditional centralized SDN architecture,this paper proposes a FANET segmented routing based on the hybrid SDN architecture.First of all,a unified network information update and maintenance method is designed for the UAVs and the controller to reduce the bandwidth occupied by unnecessary information interaction.Then,using the data forwarding method based on segmented source routing,a SDN-FANET hybrid routing is designed.Specifically,the energy-balanced intersegment routing calculation is implemented in the SDN controller according to the global information of the network,while the UAVs are equipped with the 3DGPSR algorithm for intra-segment routing calculation.In this way,the path calculation and flexible control of data flow are completed,and control overhead is reduced at the same time.Finally,we build an SDN-FANET simulation model based on OPNET software.The simulation results show that the proposed SDN-FANET segmented hybrid routing can effectively reduce the end-to-end delay,increase the packet delivery ratio,and extend the network lifetime to some extent.2.On the basis of the above work,aiming at the problem of high packet loss rate caused by the high-speed movement of nodes in FANET,this paper proposes a SDN-FANET segmented hybrid routing enhancement method based on adaptive extended Kalman prediction.First,high mobility motion model for UAVs is established.On this basis,the adaptive extended Kalman prediction algorithm is used to track and predict the three-dimensional movement of the UAV to obtain the real-time position information of the UAV.In addition,the SDN controller uses the predicted results to accurately calculate the forwarding path to realize the enhanced design of the SDN-FANET segmented hybrid routing.Simulation results based on OPNET show that the enhanced SDN-FANET segmented hybrid routing can achieve a higher packet delivery ratio and a more stable end-to-end delay performance than the original solution.