On-demand transmission and control co-design for wireless control system

With advent of wireless standards for real-time control, such as WirelessHART and ISA100.11a, Wireless Control Systems (WCSs) have been widely deployed in many application areas. However, due to limited bandwidth, the reliability of transmission is still a problem, which directly deteriorates control performance. In this paper, we consider a WirelessHART network consisting of multiple actuators and a scheduler. Inspired by practical experience, it is noticed that different actuators are of different priorities during control process, which implies demands for packet loss ratio are also different among actuators. As transmission and control are highly coupled, we propose On-demand Transmission and Control co-design (OTC) framework to determine transmission performances according to different demands of actuators. In our paper, joint transmission-control function is defined to build a unified mathematical model describing relationships between transmission and control. According to the joint function, tolerance region for transmission performances is derived at last and verified in the simulation.