## 2 Related Work
[11] considered core switching on different links, and only Ref. [12] established a multiobjective model and designed a corresponding multiobjective optimization algorithm to solve it. For the static RSCA problem, there is no study that simultaneously considers core switching, constructs a true multiobjective optimization model in which multiobjectives are not transformed into a single objective, and designs corresponding multiobjective algorithms to tackle such a model. Table 1 is the summary of reference. \begin{table}
\begin{tabular}{c c c c c c} \hline \hline \multirow{2}{*}{**References**} & \multicolumn{2}{c}{\begin{tabular}{c} **The Modulation** \\ **Format Is Variable?** \\ \end{tabular} } & \multicolumn{2}{c}{\begin{tabular}{c} **Dynamic/Static** \\ **Network Scenarios** \\ \end{tabular} } & \multicolumn{2}{c}{\
\begin{tabular}{c} **Considering** \\ **Inter-Core Crosstalk?** \\ \end{tabular} } & \multicolumn{2}{c}{
\begin{tabular}{c} **Multi-Objective** \\ **Joint Optimization?** \\ \end{tabular} } & \multicolumn{2}{c}{**Innovation**} \\ \hline
[13] & \(\surd\) & dynamic & \(\surd\) & \(\times\) & \(\times\) &
\begin{tabular}{c} A crosstalk-aware spectrum defragmentation \\ algorithm based on a metric. \\ \end{tabular} \\ \hline
[14] & \(\times\) & dynamic & \(\surd\) & \(\times\) &
\begin{tabular}{c} An RSCA algorithm based on spectrum \\ partition, predefined core priority, \\ and classification. \\ \end{tabular} \\ \hline
[15] & \(\times\) & dynamic & \(\surd\) & \(\times\) &
\begin{tabular}{c} It first proposed considering inter-core \\ crosstalk to solve the spectrum \\ fragmentation issue in SDM-EONs. \\ \end{tabular} \\ \hline
[16] & \(\surd\) & dynamic & \(\times\) & \(\times\) &
\begin{tabular}{c} A set of new algorithms were proposed to \\ solve the RMSCA problem. \\ \end{tabular} \\ \hline
[5] & \(\times\) & static & \(\surd\) & \(\times\) &
\begin{tabular}{c} It proposed a time-efficient heuristic \\ Aa-RSCA to balance the tradeoff between \\ spectrum utilization and inter-core crosstalk. \\ \end{tabular} \\ \hline
[6] & \(\times\) & static & \(\surd\) & \(\times\) &
\begin{tabular}{c} It investigated the anycast problem in space \\ division multiplexing elastic optical \\ networks overlaid on multicore fibers. \\ \end{tabular} \\ \hline
[17] & \(\surd\) & static & \(\surd\) & \(\times\) &
\begin{tabular}{c} It proposed a programmable architecture on \\ demand (ACD) node. \\ \end{tabular} \\ \hline
[8] & \(\times\) & static & \(\surd\) & \(\times\) &
\begin{tabular}{c} It proposed a heuristic algorithm with \\ crosstalk awareness. \\ \end{tabular} \\ \hline
[9] & \(\times\) & static & \(\surd\) & \(\times\) &
\begin{tabular}{c} It proposed an optimization algorithm based \\ on co-evolution to solve the RSCA problem \\ for the first time. \\ \end{tabular} \\ \hline
[10] & \(\surd\) & static & \(\surd\) & \(\times\) &
\begin{tabular}{c} It investigated the RSCA problem with the \\ guaranteed secure level in elastic optical \\ network with multi-core. \\ \end{tabular} \\ \hline
[11] & \(\surd\) & static & \(\surd\) & \(\times\) &
\begin{tabular}{c} An intelligent algorithm is proposed, and the influence of the exchange of cores on network \\ performance is considered in the mode. \\ \end{tabular} \\ \hline
[12] & \(\times\) & static & \(\surd\) & \(\surd\) &
\begin{tabular}{c} It established a multiobjective model and \\ designed a corresponding multiobjective \\ optimization algorithm to solve it. \\ \end{tabular} \\ \hline \hline \end{tabular}
\end{table} 
Table 1: Summary of References.