Age of Information in Control Loop for Industrial IoT

Recent developments in Internet of Things (IoT) enable industrial applications which require time-critical feedback of underlying physical processes in the control loop. We consider a real-time industrial IoT monitoring system for an industrial plant where the IoT sensor sample a physical process based on the control signal received from the IoT controller. This process incurs a sampling cost and an updating cost to send the status packet from the IoT sensor to the IoT controller. This joint status sampling and updating process is formulated as a minimization of Age of Information (AoI) at the IoT controller subject to energy budget constraint of each IoT sensor.