An Energy-Efficient UAV Deployment Scheme for Emergency Communications in Air-Ground Networks with Joint Trajectory and Power Optimization  

作　　者：Shuo Zhang Shuo Shi Weizhi Wang Zhenyu Xu Xuemai Gu 

机构地区：[1]School of Electronic and Information Engineering,Harbin Institute of Technology,Harbin 150001,China [2]Peng Cheng Laboratory,Shenzhen 518055,China [3]Department of Intelligent Engineering,Huizhou Engineering Vocational College,Huizhou 516023,China

出　　处：《China Communications》2022年第7期67-78,共12页中国通信（英文版）

基　　金：co-supported by National Natural Science Foundation of China (No. 62171158);the Major Key Project of PCL (PCL2021A03-1)

摘　　要：The space-air-ground integrated network(SAGIN)has gained widespread attention from academia and industry in recent years.It is widely applied in many practical fields such as global observation and mapping,intelligent transportation systems,and military missions.As an information carrier of air platforms,the deployment strategy of unmanned aerial vehicles(UAVs)is essential for communication systems’performance.In this paper,we discuss a UAV broadcast coverage strategy that can maximize energy efficiency(EE)under terrestrial users’requirements.Due to the non-convexity of this issue,conventional approaches often solve with heuristics algorithms or alternate optimization.To this end,we propose an iterative algorithm by optimizing trajectory and power allocation jointly.Firstly,we discrete the UAV trajectory into several stop points and propose a user grouping strategy based on the traveling salesman problem(TSP)to acquire the number of stop points and the optimization range.Then,we use the Dinkelbach method to dispose of the fractional form and transform the original problem into an iteratively solvable convex optimization problem by variable substitution and Taylor approximation.Numerical results validate our proposed solution and outperform the benchmark schemes in EE and mission completion time.

关 键 词：SAGIN UAV energy efficiency(EE)maximization trajectory optimization power allocation 

分 类 号：TN929.5[电子电信—通信与信息系统] TN927.2[电子电信—信息与通信工程]