最小化 IRS 和无人机辅助移动边缘计算的能耗

IF 4.4 3区 计算机科学 Q1 COMPUTER SCIENCE, INFORMATION SYSTEMS
Tingting Li , Yanjun Li , Ping Hu , Yuzhe Chen , Zheng Yin
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引用次数: 0

摘要

智能可重构表面(IRS)是一种提高频谱和能源效率的新兴技术。我们提出了一种新颖的 IRS-无人机辅助移动边缘计算(MEC)框架,其中 MEC 服务器安装在无人机上,以方便移动用户(MU)进行任务计算,而 IRS 则调制 MU 与无人机之间的信道。为进一步提高整个系统的频谱效率,采用了非正交多址接入(NOMA)技术。需要对多个参数进行联合优化,例如任务分区参数和所有 MU 的发射功率、IRS 的反射系数矩阵和无人机的运动轨迹,这些需求提出了一个挑战,即在满足所需的传输速率和任务完成延迟的同时,最大限度地降低所有 MU 的长期总能耗。我们将优化任务分为两个子问题,并分别提出了具体的解决方案,即通过深度强化学习(DRL)解决无人机和 MU 的相关决策问题;通过块坐标下降(BCD)解决 IRS 的反射系数矩阵问题。一系列实验验证了所提出的通信技术和优化算法的有效性。仿真结果表明:(1) NOMA-IRS 技术与随机部署 IRS 或不部署 IRS 的情况相比,以及与传统的带 IRS 的正交多址(OMA)技术相比,实现了更好的能效。(2) 在解决复杂的动态优化问题时,我们提出的深度确定性策略梯度(DDPG)-BCD 算法优于其他四种基准算法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Energy minimization for IRS-and-UAV-assisted mobile edge computing

Intelligent reconfigurable surface (IRS) is an emerging technology for the enhancement of spectrum and energy efficiency. We propose a novel IRS-and-unmanned aerial vehicle (UAV)-Assisted mobile edge computing (MEC) framework, where a MEC server installing on an UAV to facilitate task calculations by mobile users (MUs), and an IRS modulates channels between MUs and the UAV. Non-orthogonal multiple access (NOMA) is employed for further improving system-wide spectral efficiency. There are needs for joint optimization of multiple parameters, e.g., the task partition parameters and the transmit power of all MUs, the reflection coefficient matrix of the IRS and the movement trajectory of the UAV, and such needs raises the challenge of minimizing the long-term total energy consumption of all MUs while satisfying required transmission rate and task completion delay. We divide optimization tasks into two sub-problems and propose specific solutions respectively, i.e., relevant decisions about the UAV and MUs to be solved by deep reinforcement learning (DRL); and the reflection coefficient matrix of the IRS to be solved by block coordinate descent (BCD). A series of experiments have verified the effectiveness of the proposed communication techniques and optimization algorithms. Simulation results demonstrate that (1) NOMA-IRS technique achieves better energy efficacy compared to the cases where random IRS or no IRS is deployed and the conventional orthogonal multiple access (OMA) technique with IRS. (2) our proposed deep deterministic policy gradient (DDPG)-BCD algorithm outperforms other four benchmark algorithms in solving the complex and dynamic optimization problem.

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来源期刊
Ad Hoc Networks
Ad Hoc Networks 工程技术-电信学
CiteScore
10.20
自引率
4.20%
发文量
131
审稿时长
4.8 months
期刊介绍: The Ad Hoc Networks is an international and archival journal providing a publication vehicle for complete coverage of all topics of interest to those involved in ad hoc and sensor networking areas. The Ad Hoc Networks considers original, high quality and unpublished contributions addressing all aspects of ad hoc and sensor networks. Specific areas of interest include, but are not limited to: Mobile and Wireless Ad Hoc Networks Sensor Networks Wireless Local and Personal Area Networks Home Networks Ad Hoc Networks of Autonomous Intelligent Systems Novel Architectures for Ad Hoc and Sensor Networks Self-organizing Network Architectures and Protocols Transport Layer Protocols Routing protocols (unicast, multicast, geocast, etc.) Media Access Control Techniques Error Control Schemes Power-Aware, Low-Power and Energy-Efficient Designs Synchronization and Scheduling Issues Mobility Management Mobility-Tolerant Communication Protocols Location Tracking and Location-based Services Resource and Information Management Security and Fault-Tolerance Issues Hardware and Software Platforms, Systems, and Testbeds Experimental and Prototype Results Quality-of-Service Issues Cross-Layer Interactions Scalability Issues Performance Analysis and Simulation of Protocols.
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