Light fidelity (LiFi) is a wireless optical communication (WOC) technology that holds the key to solving the challenges of 5th and higher generation mobile networks. LiFi is a two-way wireless communication technology that enables high-speed transmission on both up and down links simultaneously. Today, researchers and manufacturers consider LiFi technology as an essential solution for radio frequency (RF) spectrum limitation due to growing demand of Internet users. In addition, integration of various communication technologies such as wireless fidelity (WiFi) and LiFi can help to overcome the traffic restriction challenge caused by the growing demand of Internet users. Although LiFi provides high-speed data transfer capability, it has some weaknesses such as coverage. So, hybrid WiFi/LiFi network can uses fast data transfer from LiFi and wide coverage from WiFi. Their integration can complement the shortcomings of each of these technologies and increases the network performance. In this work, while describing LiFi theory, the recent studies in this field are presented. Theoretical and practical concepts of LiFi-based indoor networks, issues such as network structures, cell deployment models, modulation techniques, multiple access schemes, criteria for measuring network performance, and scenario-based architectures for implementing a real LiFi-based indoor network based on up-to-date equipment manufactured by some LiFi manufacturers are discussed in detail.

光保真 (LiFi) 是一种无线光通信 (WOC) 技术，它是解决第五代及更高代移动网络挑战的关键。LiFi 是一种双向无线通信技术，可同时在上行链路和下行链路上进行高速传输。如今，由于互联网用户的需求不断增长，研究人员和制造商将 LiFi 技术视为射频 (RF) 频谱限制的基本解决方案。此外，无线保真（WiFi）和LiFi等多种通信技术的融合有助于克服互联网用户日益增长的需求带来的流量限制挑战。虽然 LiFi 提供了高速数据传输能力，但它也有一些弱点，比如覆盖范围。所以，混合 WiFi/LiFi 网络可以使用来自 LiFi 的快速数据传输和来自 WiFi 的广泛覆盖。它们的集成可以弥补这些技术的缺点并提高网络性能。在这项工作中，在描述 LiFi 理论的同时，介绍了该领域的最新研究。基于 LiFi 的室内网络的理论和实践概念，网络结构、小区部署模型、调制技术、多址方案、衡量网络性能的标准以及实现基于 LiFi 的真实室内网络的基于场景的架构等问题详细讨论了一些 LiFi 制造商制造的最新设备。在描述 LiFi 理论的同时，介绍了该领域的最新研究。基于 LiFi 的室内网络的理论和实践概念，网络结构、小区部署模型、调制技术、多址方案、衡量网络性能的标准以及实现基于 LiFi 的真实室内网络的基于场景的架构等问题详细讨论了一些 LiFi 制造商制造的最新设备。在描述 LiFi 理论的同时，介绍了该领域的最新研究。基于 LiFi 的室内网络的理论和实践概念，网络结构、小区部署模型、调制技术、多址方案、衡量网络性能的标准以及实现基于 LiFi 的真实室内网络的基于场景的架构等问题详细讨论了一些 LiFi 制造商制造的最新设备。