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Sensors 2012, 12(12), 16591-16613; doi:10.3390/s121216591

Network Adaptive Deadband: NCS Data Flow Control for Shared Networks

1,* , 2
1 School of Computer Engineering, Computer Network Engineering, University of Vigo, 32004 Ourense, Spain 2 School of Industrial Engineering, Control Engineering, University of Vigo, 36310 Vigo, Spain 3 School of Industrial Engineering, Robotics, University of Vigo, 36310 Vigo, Spain
* Author to whom correspondence should be addressed.
Received: 6 October 2012 / Revised: 23 November 2012 / Accepted: 23 November 2012 / Published: 3 December 2012
(This article belongs to the Section Sensor Networks)
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This paper proposes a new middleware solution called Network Adaptive Deadband (NAD) for long time operation of Networked Control Systems (NCS) through the Internet or any shared network based on IP technology. The proposed middleware takes into account the network status and the NCS status, to improve the global system performance and to share more effectively the network by several NCS and sensor/actuator data flows. Relationship between network status and NCS status is solved with a TCP-friendly transport flow control protocol and the deadband concept, relating deadband value and transmission throughput. This creates a deadband-based flow control solution. Simulation and experiments in shared networks show that the implemented network adaptive deadband has better performance than an optimal constant deadband solution in the same circumstances.
Keywords: deadband control; NCS; tele-operation; network protocols; sensors/actuators deadband control; NCS; tele-operation; network protocols; sensors/actuators
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Díaz-Cacho, M.; Delgado, E.; Prieto, J.A.G.; López, J. Network Adaptive Deadband: NCS Data Flow Control for Shared Networks. Sensors 2012, 12, 16591-16613.

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