Wireless Powered Communication With Cooperative UAV: Data And Energy Relay

With the rapid development of communication technology,the vision of interconnec-tion of mass devices has gradually become a reality.As a fixed data and energy source,the traditional cellular base station cannot cover remote Internet of things(Io T)sensors.As a flexible and reliable flight platform,unmanned aerial vehicle(UAV)has the advantages of convenient and cost-effective deployment,better communication channel and so on.It is becoming an effective choice in the design of wireless communication system.However,the utilization of highly mobile and energy-constrained UAV for wireless communications also introduces many new challenges.The integration of simultaneous wireless information and power transfer(SWIPT)and cooperative relay(Co R)techniques has evolved as a new phenomenon for the next-generation wireless communication system.As a component of the integrated and energy communication networks(IDENs),this paper regards UAV as a digital and energy relay platform between base stations and ground equipment.According to the research of the UAV SWIPT relay system,related science problems,time slot allocation,power control of the UAV energy transmission and optimization algorithm design,position planning of flying relay are discussed in this paper.Some key points of this paper are listed as follows:1)For UAV-assisted communication technology,this paper provides relevant air-to-ground models and classifications.Based on different UAV-SWIPT relay scenarios,an effective technical method is selected; Regarding the wireless digital energy relay tech-nology,this paper elaborates the key technical points of the SWIPT system,and gives an effective way to realize the UAV-enabled relay in SWIPT system;2)Analyze scenarios of the SWIPT system for remote sensors,design a TDMA-based time slot model for UAV-enabled SWIPT system based,and refine the related optimization problem to maximize the throughput of this system;3)Provide strategies based on convex optimization theory,improve the time slot allocation and power control algorithm for different system requirements,and improve the effectiveness and reliability of the system; Give lcoation planning strategy of UAV and time slot allocation of task in UAV digital energy relay system,reduce the system energy consumption.Compared with the traditional non-relay system,the proposed UAV-enabled relay in this paper improves the system throughput and the effectiveness of wireless charging,re-alizes the directed SWIPT for each Io T ground device,and improves system performance in different scenarios.