Robust Stabilization of Resource Limited Networked Control Systems Under Denial-of-Service Attack

TL;DR

This paper develops a robust control strategy for resource-limited networked control systems under DoS attacks, ensuring stability despite uncertainties and communication constraints using event-triggered control and input-to-state stability theory.

Contribution

It introduces a joint control and security framework with an event-triggered approach for uncertain NCS under DoS attacks, ensuring stability and efficient communication.

Findings

The control method withstands a broad class of DoS attacks.

Stability conditions are derived using input-to-state stability theory.

Numerical validation confirms effectiveness on a batch reactor system.

Abstract

In this paper, we consider a class of denial-of-service (DoS) attacks, which aims at overloading the communication channel. On top of the security issue, continuous or periodic transmission of information within feedback loop is necessary for the effective control and stabilization of the system. In addition, uncertainty---originating from variation of parameters or unmodeled system dynamics---plays a key role in the system's stability. To address these three critical factors, we solve the joint control and security problem for an uncertain discrete-time Networked Control System (NCS) subject to limited availability of the shared communication channel. An event-triggered-based control and communication strategy is adopted to reduce bandwidth consumption. To tackle the uncertainty in the system dynamics, a robust control law is derived using an optimal control approach based on a virtual nominal dynamics associated with a quadratic cost-functional. The conditions for closed-loop stability and aperiodic transmission rule of feedback information are derived using the discrete-time Input-to-State Stability theory. We show that the proposed control approach withstands a general class of DoS attacks, and the stability analysis rests upon the characteristics of the attack signal. The results are illustrated and validated numerically with a classical NCS batch reactor system.