4. The long-term model

The second long-term model as depicted in Figure 3 is depending on the developing concept of 5G-network slicing, which is permitted by contemporary swift networking progresses and improvements in mobile edge computing and storage capabilities, software-defined networking (SDN), and network functions virtualization (NFV). An extensive distinct IoT vertical industries (applications) are anticipated to be supported by 5G. Each of which have its own distinctive collection of performance and service necessities, MTC, and numerous virtual networks. Each virtual network is customized for a given applications and must be created on the top of the common physical 5G infrastructure. Each logical network is denoted as a 5G network slice. Each 5G network slice comprises of a mix of dedicated resource requests. For example, radio frequency spectrum, network equipment, and VNF. Thus, each slice will have its own virtual mobile CN as well as its own RAN functionalities. All network slices would be different and independently configured. Thus, under the second model, the 5G-network slice that is assigned to the smart grid must:


### Figure 3.

Multiple hierarchical arranged SDN controllers.
