Feedback scheduling of priority-driven control networks

  • Authors:

  • Feng Xia;Youxian Sun;Yu-Chu Tian

  • Affiliations:

  • State Key Laboratory of Industrial Control Technology, Zhejiang University, Hangzhou 310027, China and Faculty of Information Technology, Queensland University of Technology, GPO Box 2434, Brisban ...;State Key Laboratory of Industrial Control Technology, Zhejiang University, Hangzhou 310027, China;Faculty of Information Technology, Queensland University of Technology, GPO Box 2434, Brisbane QLD 4001, Australia

  • Venue:
  • Computer Standards & Interfaces
  • Year:
  • 2009

Quantified Score

Hi-index 0.00

Visualization

Abstract

With traditional open-loop scheduling of network resources, the quality-of-control (QoC) of networked control systems (NCSs) may degrade significantly in the presence of limited bandwidth and variable workload. The goal of this work is to maximize the overall QoC of NCSs through dynamically allocating available network bandwidth. Based on codesign of control and scheduling, an integrated feedback scheduler is developed to enable flexible QoC management in dynamic environments. It encompasses a cascaded feedback scheduling module for sampling period adjustment and a direct feedback scheduling module for priority modification. The inherent characteristics of priority-driven control networks make it feasible to implement the proposed feedback scheduler in real-world systems. Extensive simulations show that the proposed approach leads to significant QoC improvement over the traditional open-loop scheduling scheme under both underloaded and overloaded network conditions.