用深度学习优化边缘计算的无线网络资源分配,提升数据速率。
Learning for Cross-Layer Resource Allocation in MEC-Aided Cell-Free Networks
- 将资源分配转为多任务自监督学习问题,避免人工标注。
- 提出新损失函数,提升算法在复杂场景下的鲁棒性与精度。
- 适合研究边缘计算与无线网络协同优化的工程师与研究人员。
在移动边缘计算(MEC)辅助的无蜂窝网络中,跨层资源分配可充分挖掘传输与计算资源以提升数据速率。然而传统方法存在技术瓶颈,难以实现高效优化。本文从深度学习角度,联合优化子载波分配与波束成形,以最大化加权和速率。将问题转化为联合多任务优化,并提出一种集中式多任务自监督学习算法,避免昂贵的人工标注。设计了两种新颖通用的损失函数——负分数线性损失与指数线性损失,分别在鲁棒性与目标域适应性方面表现优异。进一步提出基于MEC的分布式多任务自监督学习(DMTSSL)算法,具有低复杂度与高可扩展性,有效应对维度灾难。最后,基于DMTSSL设计了距离感知迁移学习算法,可在动态场景中以极低计算成本实现快速适应。在3GPP 38.901城市宏小区场景下的仿真结果表明,所提算法显著优于基线方法。
原文摘要 · Abstract (English)
Cross-layer resource allocation over mobile edge computing (MEC)-aided cell-free networks can sufficiently exploit the transmitting and computing resources to promote the data rate. However, the technical bottlenecks of traditional methods pose significant challenges to cross-layer optimization. In this paper, joint subcarrier allocation and beamforming optimization are investigated for the MEC-aided cell-free network from the perspective of deep learning to maximize the weighted sum rate. Specifically, we convert the underlying problem into a joint multi-task optimization problem and then propose a centralized multi-task self-supervised learning algorithm to solve the problem so as to avoid costly manual labeling. Therein, two novel and general loss functions, i.e., negative fraction linear loss and exponential linear loss whose advantages in robustness and target domain have been proved and discussed, are designed to enable self-supervised learning. Moreover, we further design a MEC-enabled distributed multi-task self-supervised learning (DMTSSL) algorithm, with low complexity and high scalability to address the challenge of dimensional disaster. Finally, we develop the distance-aware transfer learning algorithm based on the DMTSSL algorithm to handle the dynamic scenario with negligible computation cost. Simulation results under $3$rd generation partnership project 38.901 urban-macrocell scenario demonstrate the superiority of the proposed algorithms over the baseline algorithms.
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