Paper Info
Title
Markov chain model of fault-tolerant wireless networked control systems
Abstract
Wireless networked control systems (WNCS) are composed of spatially distributed sensors, actuators, and controllers communicating through wireless networks instead of conventional point-to-point wired connections. While WNCSs have a tremendous potential to improve the efficiency of many critical control systems, for instance, in building automation and process control, the systems are fundamentally constrained by the packet losses and the functional faults of the underlying wireless sensor and actuator networks. Understanding the interaction between wireless networks and control systems is essential to characterize the performance limitations of the critical control systems and optimize its wireless network resources. This paper presents an analytical framework for modeling the behavior of the control loop over lossy and faulty network. The control loop over wireless networks is modeled through a Markov chain taking into account sensing links, actuating links, and recovery mechanism to compensate the faulty nodes. By using this model, the novel performance metrics are mathematically derived and are evaluated through both theoretical analysis and simulation results. The performance evaluation shows the critical tradeoff between the average performance when the control loop is in the normal operation mode and the recovery performance when it is in the abnormal operating mode due to the faulty nodes.
Year
DOI
Venue
2019
10.1007/s11276-017-1657-0
Wireless Networks
Keywords
Field
DocType
Wireless sensor and actuator network, Wireless networked control system, Fault-tolerant, Packet loss
Wireless network,Wireless,Computer science,Network packet,Packet loss,Computer network,Fault tolerance,Process control,Building automation,Control system,Distributed computing
Journal
Volume
Issue
ISSN
25
5
1572-8196
Citations 
PageRank 
References 
0
0.34
16
Authors
1
Name
Order
Citations
PageRank
Pan Gun Park128917.42