Table 1.

Comparison of MEO systems used in difference environments

	Method	MEO deployment	Key performance indicator
Baktir et al. [22]	IP-addressed and load-balancing	Edge server	Capabilities of SDN
Bittencourt et al. [14]	Edge-ward placement algorithm	Edge/fog computing infrastructures	CPU capacity and a static network delay for
			WLAN, MAN, and WAN communication
Hegyi et al. [20]	Optimize placing the components of	Edge server	Available virtualized resources
	IoT applications
Karagiannis et al. [23]	PSP method solving placement optimization problem	Edge server	The provisioning of resources,
			replication degree of the applications
Santoro et al. [24]	Foggy: efficient and optimized use of the infrastructure	Fog computing infrastructures	Traditional and non-traditional requirements
	while satisfying the application requirements