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Control Communication Co-Design for Wide Area Cyber-Physical Systems

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Document pages: 26 pages

Abstract: Wide Area Cyber-Physical Systems (WA-CPSs) are a class of control systemsthat integrate low-powered sensors, heterogeneous actuators and computercontrollers into large infrastructure that span multi-kilometre distances.Current wireless communication technologies are incapable of meeting thecommunication requirements of range and bounded delays needed for the controlof WA-CPSs. To solve this problem, we use a Control-Communication Co-designapproach for WA-CPSs, that we refer to as the $C^3$ approach, to design a novelLow-Power Wide Area (LPWA) MAC protocol called textit{Ctrl-MAC} and itsassociated event-triggered controller that can guarantee the closed-loopstability of a WA-CPS. This is the first paper to show that LPWA wirelesscommunication technologies can support the control of WA-CPSs. LPWAtechnologies are designed to support one-way communication for monitoring andare not appropriate for control. We present this work using an example of awater distribution network application which we evaluate both through aco-simulator (modelling both physical and cyber subsystems) and testbeddeployments. Our evaluation demonstrates full control stability, with up to$50$ better packet delivery ratios and $80$ less average end-to-end delayswhen compared to a state of the art LPWA technology. We also evaluate ourscheme against an idealised, wired, centralised, control architecture and showthat the controller maintains stability and the overshoots remain withinbounds.

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