**7. Conclusions**

MG is a solution, which facilitates SG implementation by using RER along with the control and management of loads and sources, which overcomes the intermittent nature of RER. Therefore, the management of MG is a key element that requires a robust communication infrastructure. This paper also revealed the role of MG in the power system by racketing its penetration changes to active elements, which offers AS to a utility public network. Because of its simplicity, affordability, and superb performance of wireless communication, especially in remote places, we noticed communication technologies and their characteristics in this paper in a way that summarized and reviewed applying them in different levels of MGMS as a prominent contribution of this paper, which has been ignored in recent studies. According to the MG diversity of applications, there are different control and management scenarios. Investigation of a holistic wireless employment roadmap in MGMS was another achievement of this study, which covers different control methodology scenarios and correspondence of new enhancements in wireless technology characteristics such as 5G and LoRa with new requirements of MG as an active element of the power system. This roadmap highlighted wireless enhancement application in the implementation of the developed structure of MGMS, including MAS, and higher-aspect multi-MG structure of SG. Mapping service-level requirements of these developed

MGMS to network slicing and cloud concepts through application of recent wireless technologies introduced as a new horizon of this research area.

**Author Contributions:** Conceptualization, L.T. and H.Y.; Data curation, L.T. and H.Y.; Writing—original draft preparation, L.T., H.Y. and M.J.P.; Writing—review and editing, L.T., H.Y. and M.J.P.; Supervision, L.T. and H.Y. All authors have read and agreed to the published version of the manuscript.

**Funding:** This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (No. 2019M3F2A1073179) and by Korea Electric Power Corporation (Grant number: R17XA05-66).

**Conflicts of Interest:** The authors declare no conflict of interest.
