基于计算重用的无人机辅助边缘计算系统能耗优化  

Energy Optimization for Computing Reuse in Unmanned Aerial Vehicle-assisted Edge Computing Systems

作　　者：李斌 蔡海晨 赵传信 王俊义[3] LI Bin;CAI Haichen;ZHAO Chuanxin;WANG Junyi(School of Computer Science,Nanjing University of Information Science and Technology,Nanjing 210044,China;School of Computer and Information,Anhui Normal University,Wuhu 241002,China;School of Information and Communication,Guilin University of Electronic Technology,Guilin 541004,China)

机构地区：[1]南京信息工程大学计算机学院,南京210044 [2]安徽师范大学计算机与信息学院,芜湖241002 [3]桂林电子科技大学信息与通信学院,桂林541004

出　　处：《电子与信息学报》2024年第7期2740-2747,共8页Journal of Electronics & Information Technology

基　　金：国家自然科学基金(62101277,62371149);认知无线电与信息处理教育部重点实验室基金(CRKL230203)。

摘　　要：针对复杂地形下时延敏感任务对终端用户的计算需求激增问题,该文提出一种无人机(UAV)辅助的移动边缘计算可重用任务的协同计算卸载方案。首先,通过联合优化用户卸载策略、用户传输功率、无人机上服务器分配、用户设备的计算频率和无人机服务器的计算频率以及无人机的飞行轨迹,构建满足时延约束下最小化系统平均总能耗的系统模型。其次,通过深度强化学习求解该优化问题,并提出了基于柔性动作-评价(SAC)的优化算法。该算法采用最大熵的策略来鼓励探索,以增强算法的探索能力并加快训练的收敛速度。仿真结果表明,基于SAC的算法能有效降低系统的平均总能耗,并具有较好的收敛性。To address the high computational performance demands of delay-sensitive tasks in complex terrains,the collaborative computation offloading scheme for reusable tasks in mobile edge computing with the assistance of Unmanned Aerial Vehicle(UAV)is proposed.Firstly,the minimization of the average total energy consumption is formulated by jointly optimizing user offloading,user transmission power,server assignment on UAV,computation frequencies of users and UAV servers,as well as UAV flight trajectory,while meeting the latency constraints.Secondly,a deep reinforcement learning approach is employed to solve the optimization problem,and a Soft Actor-Critic(SAC)based optimization algorithm is introduced.The SAC algorithm utilizes a maximum entropy policy to encourage exploration that enhances the algorithm’s exploration capabilities and accelerates the training convergence speed.Simulation results demonstrate that the proposed SAC algorithm effectively reduces the average total energy consumption of the system while exhibiting good convergence.

关 键 词：无人机 移动边缘计算 计算重用 资源分配 柔性动作-评价算法 

分 类 号：TN929.5[电子电信—通信与信息系统]