Abstract
Non-orthogonal multiple access (NOMA) based fog radio access networks (F-RANs) offer high spectrum efficiency, ultra-low delay, and huge network throughput, and this is made possible by edge computing and communication functions of the fog access points (F-APs). Meanwhile, caching-enabled F-APs are responsible for edge caching and delivery of a large volume of multimedia files during the caching phase, which facilitates further reduction in the transmission energy and burden. The need of the prevailing situation in industry is that in NOMA-based F-RANs, energy-efficient resource allocation, which consists of cache placement (CP) and radio resource allocation (RRA), is crucial for network performance enhancement. To this end, in this paper, we first characterize an NOMA-based F-RAN in which F-APs of caching capabilities underlaid with the radio remote heads serve user equipments via the NOMA protocol. Then, we formulate a resource allocation problem for maximizing the defined performance indicator, namely network profit, which takes caching cost, revenue, and energy efficiency into consideration. The NP-hard problem is decomposed into two sub-problems, namely the CP sub-problem and RRA sub-problem. Finally, we propose an iterative method and a Stackelberg game based method to solve them, and numerical results show that the proposed solution can significantly improve network profit compared to some existing schemes in NOMA-based F-RANs.
摘要
基于非正交多址接入(NOMA)的雾无线接入网(F-RANs)提供了高频谱效率、 超低延迟和巨大的网络吞吐量, 这得益于雾接入点(F-APs)的边缘计算和通信功能. 同时, 在缓存阶段, 具有缓存功能的F-APs负责进行大量多媒体文件的边缘缓存和传输, 从而可以进一步降低传输能量和负担. 工业界普遍需要的是在基于NOMA的F-RANs中高效的资源分配, 包括缓存放置(CP)和无线电资源分配(RRA), 这是提高网络性能的关键. 为此, 本文首先描述了一种基于NOMA的F-RAN, 其中具有缓存功能的F-APs通过NOMA协议与无线电远程单元同时为用户设备提供服务. 在此基础上, 提出一种基于网络效益最大化的资源分配问题, 该效益同时考虑了缓存成本、 收益和通信能效. 本文将此NP难问题分解为两个子问题, 即CP子问题和RRA子问题. 最后, 我们提出一种迭代方法和一种基于Stackelberg博弈的方法来求解各子问题. 数值结果表明, 在基于NOMA的F-RANs中, 与现有资源分配方案相比, 所提出的方法可以显著提高网络效益.
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Xueyan CAO designed the research, processed the data, and drafted the paper. Xueyan CAO, Shi YAN, and Hongming ZHANG revised and finalized the paper.
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Xueyan CAO, Shi YAN, and Hongming ZHANG declare that they have no conflict of interest.
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Project supported in part by the National Natural Science Foundation of China (Nos. U21A20444 and 61901044) and Young Elite Scientist Sponsorship Program by China Institute of Communications
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Cao, X., Yan, S. & Zhang, H. Resource allocation for network profit maximization in NOMA-based F-RANs: a game-theoretic approach. Front Inform Technol Electron Eng 23, 1546–1561 (2022). https://doi.org/10.1631/FITEE.2100341
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DOI: https://doi.org/10.1631/FITEE.2100341