Improvement Of GPSR Protocol In UAV Ad Hoc Network

With the continuous development of electronic technology,UAV has a wider range of applications,especially in military and civil fields.In many application scenarios,UAV cluster has higher work efficiency than single UAV,so UAV cluster has become the direction of development in the future.The application of ad hoc network technology in UAV cluster provides a reliable guarantee for the cooperative work of multiple UAVs,and routing protocol is the key technology in UAV ad hoc network.This paper studies the location-based Greedy Perimeter Stateless Routing(GPSR)protocol in two-dimensional plane and three-dimensional space deployed UAV ad hoc networks.The work of this paper is as follows:1.For the UAV ad hoc network deployed in the two-dimensional plane,the traditional ad hoc network routing protocol can not adapt to the problems of the UAV ad hoc network,such as dramatic topology changes,sparse node distribution and limited energy,this paper proposes a GPSR protocol based on Multi Target joint node selection-GPSR(MT-GPSR).In the greedy forwarding mode,when selecting the next hop forwarding node,comprehensively consider the factors such as link holding time between nodes,node degree,node residual energy and relative position distance,and use the AHP maximum entropy criterion weighting algorithm to weight the index values of the above factors to obtain the joint selection priority value of the next hop node,and select the adjacent node with the largest priority value as the next hop forwarding node.When the greedy forwarding mode fails,the improved peripheral forwarding mode is used to quickly wrap the data packet out of the routing hole.Through simulation,compared with GPSR protocol and GPSR-NMP protocol,The MT-GPSR protocol proposed in this paper is not only more suitable for UAV ad hoc network,but also greatly maintains the integrity of the network2.The traditional geographic routing protocol can not solve the problem of routing holes in the three-dimensional UAV ad hoc network because of the high-speed movement of nodes in the three-dimensional space,this paper proposes a three-dimensional geographic location routing protocol based on node Location Prediction GPSR on 3D(LP-GPSR3D).The protocol uses the mobile prediction mechanism to predict the node location.After the node degree screening,the greedy forwarding mode is used to select the next hop node according to the node prediction location for data forwarding.Aiming at the problem of routing holes,this paper proposes to use the node distance relationship and effective node degree to select two next hop forwarding nodes for data forwarding.The simulation results show that compared with RGF protocol and GPSR3D protocol,the proposed LP-GPSR3D protocol has lower network overhead,higher packet delivery rate and lower average end-to-end delay.At the same time,it improves the network throughput and makes the UAV ad hoc network in three-dimensional space have better network performance.To sum up,the MT-GPSR protocol proposed in this paper can provide good network performance and reliable communication for the UAV ad hoc network deployed in twodimensional plane,and prolong the working time of the network.For the UAV ad hoc network deployed in three-dimensional space,the LP-GPSR3D protocol proposed in this paper solves the problem that the traditional geographic location routing protocol can not solve the routing hole in three-dimensional space,and provides better performance for the network.