On the accuracy of network synchronization using persistent hourglass clocks

Eren Curuk*, Kasm Sinan Yldrm, Przemysaw Pawecz, Josiah Hester

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Batteryless sensor nodes compute, sense, and communicate using only energy harvested from the ambient. These devices promise long maintenance free operation in hard to deploy scenarios, making them an attractive alternative to battery-powered wireless sensor networks. However, complications from frequent power failures due to unpredictable ambient energy stand in the way of robust network operation. Unlike continuously-powered systems, intermittently-powered batteryless nodes lose their time upon each reboot, along with all volatile memory, making synchronization and coordination difficult. In this paper, we consider the case where each batteryless sensor is equipped with a hourglass capacitor to estimate the elapsed time between power failures. Contrary to prior work that focused on providing a continuous notion of time for a single batteryless sensor, we consider a network of batteryless sensors and explore how to provide a network-wide, continuous, and synchronous notion of time. First, we build a mathematical model that represents the estimated time between power failures by using hourglass capacitors. This allowed us to simulate the local (and continuous) time of a single batteryless node. Second, we show through simulations the effect of hourglass capacitors and in turn the performance degradation of the state of the art synchronization protocol in wireless sensor networks in a network of batteryless devices.

Original languageEnglish (US)
Title of host publicationENSsys 2019 - Proceedings of the 7th International Workshop on Energy Harvesting and Energy-Neutral Sensing Systems
PublisherAssociation for Computing Machinery, Inc
Pages35-41
Number of pages7
ISBN (Electronic)9781450370103
DOIs
StatePublished - Nov 10 2019
Event7th International Workshop on Energy Harvesting and Energy-Neutral Sensing Systems, ENSsys 2019, co-located with ACM SenSys 2019 - New York, United States
Duration: Nov 10 2019 → …

Publication series

NameENSsys 2019 - Proceedings of the 7th International Workshop on Energy Harvesting and Energy-Neutral Sensing Systems

Conference

Conference7th International Workshop on Energy Harvesting and Energy-Neutral Sensing Systems, ENSsys 2019, co-located with ACM SenSys 2019
CountryUnited States
CityNew York
Period11/10/19 → …

Keywords

  • Hourglass clocks
  • Intermittent computing
  • Sensor networks

ASJC Scopus subject areas

  • Computer Science Applications
  • Fuel Technology
  • Energy Engineering and Power Technology

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  • Cite this

    Curuk, E., Yldrm, K. S., Pawecz, P., & Hester, J. (2019). On the accuracy of network synchronization using persistent hourglass clocks. In ENSsys 2019 - Proceedings of the 7th International Workshop on Energy Harvesting and Energy-Neutral Sensing Systems (pp. 35-41). (ENSsys 2019 - Proceedings of the 7th International Workshop on Energy Harvesting and Energy-Neutral Sensing Systems). Association for Computing Machinery, Inc. https://doi.org/10.1145/3362053.3363497