# A Review on LiFi Network Research: Open Issues, Applications and Future Directions
## 3 Taxonomy
### Other Articles  
This section presents other articles (n = 7) that did not conduct any implementation but proposed various useful aspects and analysis in the field of LiFi technology. These aspects are outlined as follows: (i) Design: The research done by [129], proposed a new architecture to leverage VLC and a steerable IR beam to enhance the data transmission rate of indoor users in the Fi-Wi access networks. The study in [130] proposed a novel idea using balloons in LiFi based disaster management or during a natural calamity. This proposal has been taken as a use case to provide a safe and cost-effective solution for these disaster management cases. (ii) Development: The study in [131] presented an automated system that detects drivers in a drunk condition to provide an effective solution and an intelligent system for vehicles that can prevent accidents due to this cause. Meanwhile, the study in [132] proposed a flexible system concept for LiFi that addressed the heterogeneous demands of future IoT applications while using harmonized technology. Their objective was to present their system by introducing a standard set of core technologies and combining them in different ways to build specific solutions. (iii) Analysis: The study in [4] aimed to retrieve the most promising applications, such as those used for homes, supermarkets, museums, and communication among vehicles, through the analytic hierarchy process model and qualitative analysis. (iv) Model: [133], offered five PAMS information system models that ensured data collection and transferto the crisis decision-making centre. The purpose of these models was to build and study the model options of an information system designed to transfer data relating to an accident, process the data received in the crisis centre, and make operational decisions to ensure enhanced safety and eliminate emergencies. (v) Concept: [29] described LiFi and highlighted its key differences to VLC. It also discussed misconceptions and illustrated the potential impact of this technology on several existing and emerging industries.  
\begin{table}
\begin{tabular}{|c|c|c|c|c|c|c|c|c|c|c|c|c|} \hline  & & \multicolumn{3}{c|}{**C1**} & \multicolumn{3}{c|}{**C2**} & \multicolumn{3}{c|}{**C3**} & \multicolumn{3}{c|}{**C4**} \\  & **Problem** & & & & **Method** & & & **Environment** & & & **Transmission Direction** \\ \hline \multirow{4}{*}{Ref.} & **HO and Mobility** & \multirow{2}{*}{**Interference**} & **Shadowing** & \multirow{2}{*}{**Spectral**} & \multirow{2}{*}{**NLOS**} & **APS, APA,** & \multirow{2}{*}{**LB**} & **Fuzzy Logic** & \multirow{2}{*}{**Indoor**} & **Outdoor** & **UL** & **DL** & **Bi-Directional** \\  & & & **Blockage** & & & & & & & **Logic** & & & **Directional** \\ \hline \multirow{4}{*}{Ref.} & [15,17,19- & 21,73,00, & & & & 11,15,34, & [2,17,21,26, & 18,40, & & [2,9,11,15,17, & & & [2,9,32- & \\  & 21,23,30, & 19,33,35,42, & & & & 40,30,51, & [2,17,21,26, & 23,25,26,28,80, & & & 35,9,41,47, & 48,56,62,66, & 48,56,62,64, & \\  & 37,41,44, & 48,54,76,00- & [13,24,53, & [74,87,96, & [39, & 53,56,61, & 56,62,64, & [38,83,56, & [38,53,56, & [49,95,74,76,79, & [16,36,52,61, & [102], \\  & 55,57,61- & [102] & 83,103-109] & 96,103 & [103] & [62,64,66, & [6,69,70,7, & [110], & 66,68,70,73- & [110], & 66,68,70,73- & [124], \\  & 66,68- & [102] & 83,103-109] & 103 & [103] & [62,64,66, & [6,69,70, & & 76,78- & & 112,13,115, & \\  & 70,73- & [80] & & & & 108] & [91,95] & [93,83,48,78- & & & & 116,121,125- & \\ \hline \multirow{4}{*}{Total} & \multirow{4}{*}{34} & \multirow{4}{*}{36} & \multirow{4}{*}{17} & \multirow{4}{*}{5} & \multirow{4}{*}{2} & \multirow{4}{*}{19} & \multirow{4}{*}{22} & \multirow{4}{*}{4} & \multirow{4}{*}{67} & \multirow{4}{*}{2} & \multirow{4}{*}{3} & \multirow{4}{*}{34} & \multirow{4}{*}{11} \\  & & & & & & & & & & & & & \\ \hline \end{tabular}
\end{table}
Table 1: Classification statistics of simulation studies based on multiple aspects.