Networked Systems under Denial-of-Service: Co-located vs. Remote Control Architectures

Abstract

In this paper, we study networked systems in the presence of Denial-of-Service (DoS) attacks, namely attacks that prevent transmissions over the communication network. Previous studies have shown that co-located architectures (control unit co-located with the actuators and networked sensor channel) can ensure a high level of robustness against DoS. However, co-location requires a wired or dedicated actuator channel, which could not meet flexibility and cost requirements. In this paper we consider a control architecture that approximates co-location while enabling remote implementation (networked sensor and actuator channels). We analyze closed-loop stability and quantify the robustness "gap" between this architecture and the co-located one.

Robust event‐triggered model predictive control for cyber‐physical systems under denial‐of‐service attacks

“…Then, it can be obtained that where and . Notice that and is monotonically increasing with t , following the same argument as in theorem 1 in the work of De Persis and Tesi and lemma 2 in the work of Feng and Tesi in which the parameter σ is selected such that …”

“…Remark Compared with the strategies proposed in the works of De Persis and Tesi and Feng and Tesi, where the system constraints are not concerned, the difficulties are the analysis of the event‐triggered control and how to deal with the predicted input error v ( t ). Based on the ISpS framework, not only the relationship between the stabilization criteria and the time characteristics of the tolerable DoS attacks is obtained but also v ( t ) can be regarded as an additional input to prove the stability of the closed‐loop system.…”

“…It can be observed that the system cannot be stabilized without the packet‐based method and predicted input signals. The bottom shows the result of the algorithm in the work of Feng and Tesi, where a packed‐based predictor method is used. It can be seen that the method in the aforementioned work can tolerate the same DoS attacks.…”

“…The bottom shows the result of the algorithm in the work of Feng and Tesi, where a packed‐based predictor method is used. It can be seen that the method in the aforementioned work can tolerate the same DoS attacks. However, the performance index is larger than that in this paper.…”

“…When the DoS attacks are present, if the optimal control values are still available, the control performance is still guaranteed. Inspired by the predictor‐based control framework, a robust MPC strategy for linear CPSs with disturbances under DoS attacks is investigated in this paper. The physical plant considered in this paper is a constrained continuous‐time system, and the robust sampled‐data MPC strategy is designed to calculate the optimal control sequences.…”