多UAV辅助反向散射边缘计算网络能耗优化方案  

Power consumption optimization scheme for multi-UAV-assistedbackscattering edge computing network

作　　者：刘超文 王丽平 党儒鸽 张浩然 刘伯阳 LIU Chaowen;WANG Liping;DANG Ruge;ZHANG Haoran;LIU Boyang(School of Communications and Information Engineering,Xi’an University of Posts and Telecommunications,Xi’an 710121,China;Shaanxi Key Laboratory of Information Communication Network and Security,Xi’an 710121,China)

机构地区：[1]西安邮电大学通信与信息工程学院,陕西西安710121 [2]陕西省信息通信网络及安全重点实验室,陕西西安710121

出　　处：《西安邮电大学学报》2024年第1期20-31,共12页Journal of Xi’an University of Posts and Telecommunications

基　　金：陕西省自然科学基础研究计划项目(2020JQ-851);陕西省普通高校青年杰出人才支持计划项目。

摘　　要：为了改善通信过程中由于遮挡导致信号衰落及设备能量不足以支撑大数据传输的问题,提出一种多无人机(Unmanned Aerial Vehicle,UAV)辅助反向散射边缘计算(Mobile Edge Computing,MEC)网络能耗优化方案。该方案根据UAV与反向散射辅助MEC系统模型构建非凸优化问题,利用块坐标下降法(Block Coodinate Descent,BCD)和变量替换将非凸优化问题转化为凸问题,再利用拉格朗日对偶算法和次梯度算法对该凸问题进行迭代求解。基于连续凸近似(Successive Convex Approximation,SCA)算法优化UAV轨迹,以最小化用户设备与UAV的能耗加权和。仿真结果表明,所提方案在不同参数下均有效可靠,与固定所有UAV轨迹、固定通信UAV轨迹、固定功率UAV轨迹等3种方案相比,所提方案能够有效降低系统能耗。In order to improve the signal degradation due to occlusion and insufficient device energy,so as to support large data transmission in the communication process,a power optimisation scheme is proposed for a multi-UAV assisted backscattered edge computing(MEC)network.The scheme constructs a non-convex optimisation problem based on the UAV and backscatter-assisted MEC system model,and then transforms the non-convex optimisation problem into a convex problem by using the block coodinate descent(BCD)and variable substitution,and then solves the convex problem iteratively by using the Lagrangian duality algorithm and the sub-gradient algorithm.The UAV trajectory is optimised based on the successive convex approximation(SCA)algorithm to minimise the weighted sum of the energy consumption of the user and the UAV.Simulation results show that the proposed scheme is effective and reliable under different parameters.Compared with the three schemes of fixed all UAV trajectories,fixed communication UAV trajectories and fixed power UAV trajectories,the proposed scheme can effectively reduce system energy consumption.

关 键 词：移动边缘计算 无人机 反向散射 块坐标下降法 拉格朗日对偶算法 次梯度算法 连续凸近似算法 

分 类 号：TN929.5[电子电信—通信与信息系统]