NDLI: Scheduling measurements and controls over networks — Part II: Rollout strategies for simultaneous protocol and controller design

Content Provider	IEEE Xplore Digital Library
Author	Antunes, D.J. Heemels, W.P.M.H. Hespanha, J.P. Silvestre, C.J.
Copyright Year	2012
Description	Author affiliation: Inst. for Syst. & Robot., Inst. Super.Tecnico, Lisbon, Portugal (Silvestre, C.J.) \|\| Hybrid & Networked Syst. Group, Eindhoven Univ. of Technol., Eindhoven, Netherlands (Antunes, D.J.; Heemels, W.P.M.H.) \|\| Dept. of Electr. & Comput. Eng., Univ. of California, Santa Barbara, CA, USA (Hespanha, J.P.)
Abstract	We consider a networked control system where a plant is connected to a remote controller via a shared network that allows only one user to transmit at a given time. At each transmission time, the controller decides between sampling one of the plant's sensors or transmitting control data to the plant. We tackle the problem of simultaneously designing a policy for scheduling decisions and a policy for control inputs so as to optimize a quadratic objective. Using the framework of dynamic programming, we propose a rollout strategy by which the scheduling and control decisions are determined at each transmission time as the ones that lead to optimal performance over a given horizon assuming that from then on controller and sensors transmit in a periodic order and the control law is a standard optimal law for periodic systems. We show that this rollout strategy results in a protocol where scheduling decisions are based on the state estimate and error covariance matrix of a Kalman estimator, and must be determined on-line. We contrast the solution to this problem with the solution to the seemingly similar sensor scheduling problem where optimal scheduling decisions can be determined off-line. We highlight how the protocol obtained from the rollout algorithm can be implemented in a distributed way in broadcast networks. Moreover, it follows by construction of rollout algorithms that our proposed scheduling method can outperform any periodic scheduling of transmissions.
Sponsorship	IEEE Control Syst. Soc.
Starting Page	2042
Ending Page	2047
File Size	299916
Page Count	6
File Format	PDF
ISBN	9781457710957
ISSN	07431619
e-ISBN	9781457710964
e-ISBN	9781467321020
DOI	10.1109/ACC.2012.6315640
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2012-06-27
Publisher Place	Canada
Access Restriction	Subscribed
Rights Holder	American Automatic Control Council(AACC)
Subject Keyword	Sensors Protocols Scheduling Optimal scheduling Covariance matrix Processor scheduling Networked control systems
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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Scheduling measurements and controls over networks - part ii: rollout strategies for simultaneous protocol and controller design,” mar. 2012, to be presented at the american control conference (acc (2012).

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