Dynamic Multiple Access Configuration in Intelligent Lifi Attocellular Access Points
Dynamic Multiple Access Configuration in Intelligent Lifi Attocellular Access Points
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DOI：
10.1109/access.2019.2916344
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发表时间：
2019-01-01
期刊：
影响因子：
3.9
通讯作者：
Haas, Harald
中科院分区：
文献类型：
--
作者：
Abumarshoud, Hanaa;Alshaer, Hamada;Haas, Harald
全球无线连接需求的指数增长要求对可用无线资源进行有效和可靠的管理。光保真（LiFi）利用红外光谱和可见光谱中大量未开发的无线传输资源来创建超密集无线网络，支持用户移动性、多用户接入和切换。已经开发了各种多用户接入（MA）协议以满足变化的系统要求，包括正交多址（OMA）和非正交多址（NOMA）方案。虽然NOMA一方面允许可实现的数据速率的显著增强，但是在诸如大量连接的用户或存在于高度对称位置中的用户的特定条件下，其性能可能严重降级。另一方面，OMA在这样的场景中提供更好的链路可靠性，但是以降低的频谱效率为代价。因此，需要在LiFi接入点（AP）中实现一定程度的智能以促进MA协议的实时配置。为此，本文开发了一种新的跨层设计框架，用于智能LiFi AP中的动态多址选择（DMAS）。所开发的框架在LiFi attocell系统级运行，并且可以被配置为在总和数据速率、平均中断概率和公平性方面满足各种系统要求。所得到的结果表明，DMAS引入了一个有效的解决方案，多用户资源分配，实现更好的满足系统的要求相比，静态配置的一个MA计划。
The exponential growth in the global demand for wireless connectivity calls for efficient and reliable management of the available wireless resources. Light fidelity (LiFi) harnesses the vast untapped wireless transmission resources in the infrared spectrum and visible light spectrum to create ultra-dense wireless networks which support user mobility, multiuser access, and handover. Various multiuser access (MA) protocols have been developed to meet the varying system requirements, including orthogonal multiple access (OMA) and non-orthogonal multiple access (NOMA) schemes. While NOMA, on the one hand, allows for significant enhancement in the achievable data rates, its performance may be severely degraded under particular conditions such as a large number of connected users or users existing in highly symmetrical locations. OMA, on the other hand, provides better link reliability in such scenarios but at the expense of decreased spectral efficiency. Therefore, there is a need to enable a degree of intelligence in the LiFi access point (AP) to facilitate real-time configuration of the MA protocol. To this end, this paper develops a novel cross-layer design framework for dynamic multiple access selections (DMAS) in intelligent LiFi APs. The developed framework runs at LiFi attocell system level and can be configured to cater for various system requirements in terms of sum data rate, average outage probability, and fairness. The obtained results show that DMAS introduces an effective solution for multiuser resource allocation by achieving better satisfaction of the system requirements compared to the static configuration of a single MA scheme.