An Energy-Efficient Model of Fog and Device Nodes in IoT

Various types and huge number of devices like sensors and actuators are interconnected with clouds of servers in IoT (Internet of Things). Here, a large volume of data including multimedia data like image created by sensors are transmitted to servers in clouds through networks. Processes in servers decide on actions and send the actions to actuators under time constraints like realtime one. However, huge volume of data are transmitted in networks and servers are heavily loaded. An intermediate layer named fog layer is introduced between clouds and devices in IoT to overcome the difficulties. Processing to be done and data to be stored in servers are distributed to fog nodes while centralized on servers in clouds in traditional cloud computing systems. In this paper, we newly propose a linear IoT model to deploy processes and data to devices, fog nodes, and servers in IoT so that the total electric energy consumption of nodes can be reduced. We show the total electric energy of the IoT model is smaller than the cloud model in the evaluation.