首页|基于李雅普诺夫的RIS辅助无人机边缘计算网络中任务卸载与资源分配研究

基于李雅普诺夫的RIS辅助无人机边缘计算网络中任务卸载与资源分配研究

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  • 国家科技期刊平台
  • NETL
  • NSTL
  • 万方数据
针对无人机(UAV)面对复杂时变的衰落信道对无线传输造成不利影响这一问题,构建了可重构智能表面(RIS)辅助UAV边缘计算网络中UAV轨迹、RIS相移、卸载时隙分配、CPU频率分配和用户设备(UE)传输功率的联合优化问题.为了求解构建的问题,对UE和UAV的任务队列稳定性约束进行转化,将多时隙随机性优化问题转化为每个时隙的确定性优化问题,提出了基于李雅普诺夫优化和块坐标下降(BCD)法的任务卸载与资源分配(JORL)方法.首先基于三角不等式求解RIS相移并求得闭合表达式;然后使用非凸转凸问题的技术求解卸载时隙分配、CPU频率分配和UE传输功率;最后基于连续凸近似方法求解UAV轨迹.仿真结果表明,JORL在保证任务队列稳定性和降低能耗方面有较优越的性能.
Research on task offloading and resource allocation in edge computing network of RIS assisted UAV based on Lyapunov
To address the problem that unmanned aerial vehicle(UAV)face complex time-varying fading channels,which could affect wireless transmission,a joint optimization problem of UAV's trajectory,reconfigurable intelligent surface(RIS)phase shift,offloading slot allocation,CPU frequency allocation,and user equipment transmission power was constructed.In order to solve the constructed problem,the stability constraints of UE and UAV task queues were transformed,and the multi-timeslot stochastic optimization problem was transformed into a deterministic optimization problem for each time slot.A JORL optimization method based on Lyapunov optimization and block coordinate descent(BCD)method was proposed.Firstly,the phase shift of RIS was solved based on the triangle inequality and the closure expression was obtained.Then the technology of transforming the non-convex into the convex problem was used to solve the offloading slot allocation,CPU frequency allocation and user equipment transmission power.Finally,the trajec-tory of UAV was solved based on successive convex approximation(SCA)method.Simulation results show that JORL has better performance in ensuring queue stability and reducing energy consumption.

unmanned aerial vehicleedge computingreconfigurable intelligent surfacetask queueLyapunov optimization

邝祝芳、郭宇敬、邓晓衡

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中南林业科技大学计算机与数学学院,湖南 长沙 410004

中南大学电子信息学院,湖南 长沙 410083

无人机 边缘计算 可重构智能表面 任务队列 李雅普诺夫优化

国家自然科学基金资助项目国家重点研发计划基金资助项目湖南省自然科学基金资助项目湖南省教育厅优秀青年基金资助项目

620724772023YFD22017032024JJ564822C0132

2024

10.11959/j.issn.1000-436x.2024155

通信学报
中国通信学会

通信学报

CSTPCD北大核心
影响因子：1.265
ISSN：1000-436X
年,卷(期)：2024.45(9)