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FLOPSYNC-QACS: Quantization-aware clock synchronization for wireless sensor networks
Dipartimento di Elettronica, Informazione e Bioingegneria, Politecnico di Milano, Milano, Italy.
Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.ORCID iD: 0000-0002-1364-8127
Dipartimento di Elettronica, Informazione e Bioingegneria, Politecnico di Milano, Milano, Italy.
Dipartimento di Elettronica, Informazione e Bioingegneria, Politecnico di Milano, Milano, Italy.
2017 (English)In: Journal of systems architecture, ISSN 1383-7621, E-ISSN 1873-6165, Vol. 80, 77-84 p.Article in journal (Refereed) Published
Abstract [en]

Distributed real-time systems often rely on clock synchronization. However, the achievement of precise synchronization in Wireless Sensor Networks (WSNs) is hampered by competing design challenges, which finally causes many WSN hardware platforms to rely on low frequency clock crystal for local timebase provision. Although this solution is inexpensive and with a remarkably low energy consumption, it limits the resolution at which time can be measured. The FLOPSYNC synchronization scheme was then introduced to compensate for possible quartz crystal imperfections. The main limitation of FLOPSYNC is that it does not account for the effects of quantization. In this paper we propose a switched control variant of the base FLOPSYNC scheme to address quantization explicitly in the compensator design, providing clock synchronization in cost-sensitive WSN node platforms with a minimal additional overhead. Experimental evidence is given that the approach reaches a synchronization error of at most 1 clock tick in a real WSN.

Place, publisher, year, edition, pages
Elsevier B.V. , 2017. Vol. 80, 77-84 p.
Keyword [en]
Clock synchronization, Quantized control, Switched control, Wireless sensor network, Clocks, Energy utilization, Interactive computer systems, Mechanical clocks, Real time systems, Sensor nodes, Switching systems, Synchronization, Distributed real time system, Low energy consumption, Precise synchronizations, Synchronization scheme, Wireless sensor network (WSNs), Wireless sensor networks
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:mdh:diva-37153DOI: 10.1016/j.sysarc.2017.09.006ISI: 000413883100007Scopus ID: 2-s2.0-85031006311OAI: oai:DiVA.org:mdh-37153DiVA: diva2:1152764
Available from: 2017-10-26 Created: 2017-10-26 Last updated: 2017-11-16Bibliographically approved

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Papadopoulos, Alessandro

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