Dealing with network complexity in real-time networked control

Authors:
Yu-Chu Tian;David Levy
Affiliations:
Faculty of Information Technology, Queensland University of Technology, Brisbane, Australia;School of Electrical and Information Engineering, The University of Sydney, Sydney, Australia
Venue:
International Journal of Computer Mathematics - COMPLEX NETWORKS
Year:
2008

Citing 10
Cited 0

An observer-based compensator for distributed delays

Automatica (Journal of IFAC)
Performance evaluation of switched ethernet for real-time industrial communications

Computer Standards & Interfaces
Hard Real-Time Communication with the Timed Token Protocol: Current State and Challenging Problems

Real-Time Systems
Supporting excess real-time traffic with active drop queue

IEEE/ACM Transactions on Networking (TON)
Controller Area Network (CAN) schedulability analysis: Refuted, revisited and revised

Real-Time Systems
Networked H∞ control of linear systems with state quantization

Information Sciences: an International Journal
Compensation for control packet dropout in networked control systems

Information Sciences: an International Journal
Functional analysis of a real-time protocol for networked control systems

ATVA'06 Proceedings of the 4th international conference on Automated Technology for Verification and Analysis
Network-Based Robust Filtering for Uncertain Linear Systems

IEEE Transactions on Signal Processing
Network-based robust H∞ control of systems with uncertainty

Automatica (Journal of IFAC)

Quantified Score

Hi-index	0.00

Visualization

Abstract

This paper addresses complex real-time networked control systems (NCSs). From our recent effort in this area, a general framework is developed to deal with network complexity. When the complex traffic of real-time NCSs are treated as stochastic and bounded variables, simplified yet improved methods for robust stability and control synthesis can be developed to guarantee the stability of the systems. From the perspective of network design, over-provisioning of network capacity is not a general solution as it cannot provide any guarantee for predictive communication behaviour, which is a basic requirement for many real-time applications. Co-design of network and control is an effective approach to simplify the network behaviour and consequently to maximize the performance of the overall NCSs. To implement such a co-design, a queuing protocol is applied to obtain predictable network traffic behaviour. Then, the predictable network-induced delay is compensated through the controller design, and any dropped control packet is also estimated in real-time using past control packets. In this way, the network-induced delay can be limited within a single control period, significantly simplifying the network complexity as well as system analysis and design.