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To wait or to drop: On the optimal number of retransmissions in wireless control
KTH, School of Electrical Engineering (EES), Centres, ACCESS Linnaeus Centre.ORCID iD: 0000-0003-4733-2240
KTH, School of Electrical Engineering (EES), Automatic Control.ORCID iD: 0000-0003-1725-2901
KTH, School of Electrical Engineering (EES), Automatic Control.
2015 (English)In: 2015 European Control Conference, ECC 2015, IEEE , 2015, 962-968 p.Conference paper (Refereed)Text
Abstract [en]

The dimensioning of wireless communication protocols for networked control involves a non-trivial trade-off between reliability and delay. Due to the lossy nature of wireless communications, there is a risk that sensor messages will be dropped. The end-to-end reliability can be improved by retransmitting dropped messages, but this comes at the expense of additional delays. In this work, we determine the number of retransmissions that strikes the optimal balance between communication reliability and delay, in the sense that it achieves the minimal expected linear-quadratic loss of the closed-loop system. An important feature of our setup is that it accounts for the random delays and possible losses that occur when unreliable communication is combatted with retransmissions. The resulting controller dynamically switches among a set of infinite-horizon linear-quadratic regulators, and is simple to implement. Numerical simulations are carried out to highlight the trade-off between reliability and delay. © 2015 EUCA.

Place, publisher, year, edition, pages
IEEE , 2015. 962-968 p.
Keyword [en]
Closed loop systems, Economic and social effects, Wireless telecommunication systems, Communication reliabilities, End-to-end reliabilities, Important features, Infinite horizons, Linear quadratic regulator, Networked controls, Wireless communication protocols, Wireless communications, Reliability
National Category
Control Engineering
URN: urn:nbn:se:kth:diva-186823DOI: 10.1109/ECC.2015.7330666ScopusID: 2-s2.0-84963904003ISBN: 9783952426937OAI: diva2:928964
European Control Conference, ECC 2015, 15 July 2015 through 17 July 2015

QC 20160517

Available from: 2016-05-17 Created: 2016-05-13 Last updated: 2016-05-17Bibliographically approved

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Demirel, BurakAytekin, ArdaJohansson, Mikael
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