Performance Optimization For UAV-enabled V2I Communication System

With the development of mobile network,IOT is gradually becoming more and more popular,along with the rapid development of the technology of modern automobile industry,car plays an important role in the our life,thus V2X have a rapid development.With deepening of the research on the V2X,the coverage of V2X is becoming wider and wider,and communication requirements varies with the scenes.For example,the vehicle can not communication with the base station because of the distance is too far in towns and remote areas,or in wireless communication systems vehicle can not get messages from base station without infrastructure coverage due to the nature disasters.In view of these situations,combined with the characteristics of low cost and convenient,this paper investigates a mobile relaying technique.The relay nodes are installed on UAVs,so they can move with high speed.Compared to the fixed relay nodes,an UAV-based relays are able to provide better communication service via reasonable UAV-based relay trajectory design.In this wireless communication system,the user equipment that can connect with relay while is not able to receive the information from the remote station.UAVs are applied to both general communication services and personalized communication services,we will maximize the minimum transmission rate from UAV-based relay to mobile ground vehicles and show the best reasonable UAV trajectory design.In the general operation of UAV-based relay wireless communication system,the purpose of system is that the ground vehicles are able to have basic communications.In the current research of UAV-based relay wireless communication,the ground users is stable.However,the ground vehicles are movement in this paper,which will be more in line with the communication model of the V2I.In the research,we regard the transmission rate in the communication process as an important indicator.It can be known that the transmission rate is related to the position of the UAV and the position of the ground vehicle,and in the general business,the vehicles get the same message from UAV-based relay.In order to ensure that all of the vehicles are able to receive messages from UAV-based relay,we will maximize the minimum transmission rate from UAV-based relay to mobile ground vehicles.Simulation results show the best reasonable UAV trajectory design.In the personalized service of the UAV-assisted wireless communication system,it is same to the general service except the ground movement vehicles receive the different message from UAV.We get the real-time coordinates of the vehicles on the ground through GPS,and calculate and optimize transmission rate to get the optimal path of the UAV.