Research And Implementation Of Flying AdHoc Networks Protocol Based On Node Movement State Trend

In recent years,the application of UAV has gradually become a research hotspot.Compared with a single UAV,the UAV ad hoc network is more reliable,with more diversified functions,and is widely used in military and civil fields.Due to the fast mobility and frequent topology changes of FANET nodes,traditional MAC protocols and routing protocols in FANET have problems such as high end-to-end delay,packet loss rate and network routing control overhead,resulting in that FANET cannot be directly applied to communication scenarios with high delay and stability requirements.Therefore,this paper combines the high dynamics of FANET,and under the premise of ensuring a certain stable transmission capacity of FANET,studies and designs MAC protocols and routing protocols suitable for FANET.The main research contents are as follows:First,the static TDMA protocol adopts a fixed allocation of time slots,which can effectively avoid the problem of high channel collision probability in FANET,so it is suitable for high dynamic FANET.In a FANET environment with a large number of nodes,FANET nodes have different requirements for channel resources.Nodes with more traffic cannot compete for more time slot resources to meet data transmission requirements,while nodes with less traffic still occupy idle time slots.slot resources,resulting in low channel utilization.Therefore,in order to solve the problems of low channel utilization and low data transmission efficiency of the static TDMA protocol in the highly dynamic and large-scale FANET,a LMAC protocol based on the dynamic allocation algorithm of time slot resources is designed in combination with the clustering technology.According to the FANET The node’s business status and movement trend,and dynamically schedule the idle time slot resources of neighboring nodes to meet the transmission needs of its own nodes.This article uses the OMNET++ simulation platform to build a dynamic FANET simulation scene,and compares and analyzes the simulation of D-LMAC and LMAC protocols.The simulation results show that in the FANET environment where there are many node traffic and unbalanced traffic distribution,the end-to-end delay and network throughput performance of the D-LMAC algorithm are better than those of the LMAC protocol.Second,because of frequent changes in FANET topology and frequent interruptions of communication links,the communication links established by AODV protocol are unreliable,which requires frequent repair and reconstruction of routes,resulting in high routing control overhead and serious packet loss.Considering the fast mobility,frequent topology changes and limited energy of FANET nodes,the routing constraints in the traditional AODV protocol are optimized.Combining the relative moving speed and residual energy of the FANET node,the stability of the node is calculated.Based on the calculated stability of the node and the minimum hops,an AODV protocol with speed and energy constraints is proposed.The NS-AODV,AODV and DSDV protocols are simulated using OMNET++.The simulation results show that the NS-AODV protocol with speed and energy constraints when the node speed is high has better network performance than AODV protocol and DSDV protocol.