# Resource Management in Cloud Radio Access Network: Conventional and New Approaches
### Review of Existing Surveys
\begin{table}
\begin{tabular}{c c c c} \hline \hline \
\begin{tabular}{c} **Year of** \\ **Publication** \\ \end{tabular} & **Ref.** & **Topic(s) of Survey** &
\begin{tabular}{c} **Resource** \\ **Management** \\ \end{tabular} & **C-RAN** \\ \hline
2013 & [10] & Energy-efficient wireless communications & ✓ & ✗ \\ \hline
2014 & [14] & Resource management in clouds & ✓ & ✗ \\ \hline
2014 & [22] &
\begin{tabular}{c} Radio resource management for heterogeneous LTE/LTE-A \\ networks \\ \end{tabular} & ✓ & ✗ \\ \hline
2014 & [17] & Resource allocation and monitoring in cloud computing & ✓ & ✗ \\ \hline
2015 & [7] & Resource sharing in heterogeneous cloud radio access networks & ✓ & ✓ \\ \hline
2015 & [18] &
\begin{tabular}{c} Machine learning applications for energy-efficient resource \\ management in cloud computing environments \\ \end{tabular} & ✓ & ✗ \\ \hline
2015 & [9] &
\begin{tabular}{c} Energy-efficient base-stations sleep-mode techniques in green \\ cellular networks \\ \end{tabular} & ✓ & ✗ \\ \hline
2015 & [15] &
\begin{tabular}{c} Evolutionary computation for resource management of \\ processing in cloud computing \\ \end{tabular} & ✓ & ✗ \\ \hline
2016 & [8] & Resource management toward 5G RANs & ✓ & ✓ \\ \hline
2016 & [16] & Resource scheduling in cloud computing & ✓ & ✗ \\ \hline
2016 & [12] &
\begin{tabular}{c} Strategies for switching off base stations in heterogeneous \\ networks for greener 5G systems \\ \end{tabular} & ✓ & ✓ \\ \hline
2017 & [11] &
\begin{tabular}{c} Radio resource management in machine-to-machine \\ communications \\ \end{tabular} & ✓ & ✗ \\ \hline
2017 & [20] & Energy efficiency on fully cloudified mobile networks & ✓ & ✗ \\ \hline
2018 & [6] & Resource allocation and scheduling methods in cloud & ✓ & ✗ \\ \hline
2018 & [13] & Clustering techniques for RRH in 5G networks & ✓ & ✗ \\ \hline
2018 & [25] & Caching techniques in cellular networks & ✓ & ✗ \\ \hline
2018 & [21] & Recent advancements of heterogeneous radio access networks & ✗ & ✓ \\ \hline
2019 & [19] & Cloud radio access network for 5G cellular systems & ✗ & ✓ \\ \hline
2019 & [23] & RAN architectures for 5G mobile communication system & ✗ & ✓ \\ \hline
2019 & [24] & Recent trends and open issues in energy efficiency of 5G & ✓ & ✗ \\ \hline  &
\begin{tabular}{c} **Our** \\ **survey** \\ \end{tabular} & **Resource management in cloud radio access networks** & ✓ & ✓ \\ \hline \hline \end{tabular}
\end{table} 
Table 1: Existing surveys on related topics. of this architecture, wherein they mentioned the benefits and drawbacks of C-RAN for 5G cellular systems [19; 23]. However, computational and radio resource management are not specifically considered in these articles. Radio resource management is discussed in the literature for C-RAN, H-CRAN, and other communication scenarios [7; 8; 11; 22], but computational resource management is not covered in these surveys. Different techniques of base stations have also been reviewed in [9; 12; 13]. However, they do not explicitly include the recent techniques for RRH clustering, which is reviewed in this survey.