Energy profiling in practical sensor networks: Identifying hidden consumers

James Brusey, John Kemp, Elena Gaura, Ross Wilkins, M. Allen

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8 Citations (Scopus)
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Abstract

Reducing energy consumption of wireless sensor nodes extends battery life and / or enables the use of energy harvesting and thus makes feasible many applications that might otherwise be impossible, too costly or require constant maintenance. However, theoretical approaches proposed to date that minimise WSN energy needs generally lead to less than expected savings in practice. We examine experiences of tuning the energy profile for two near-production wireless sensor systems and demonstrate the need for (a) microbenchmark-based energy consumption profiling, (b) examining start-up costs, and (c) monitoring the nodes during long-term deployments. The tuning exercise resulted in reductions in energy consumption of a) 93% for a multihop Telos-based system (average power 0.029 mW) b) 94.7% for a single hop Ti- 8051-based system during startup, and c) 39% for a Ti- 8051 system post start-up. The work reported shows that reducing the energy consumption of a node requires a whole system view, not just measurement of a “typical” sensing cycle. We give both generic lessons and specific application examples that provide guidance for practical WSN design and deployment.
Original languageEnglish
Pages (from-to)6072-6080
JournalIEEE Sensors Journal
Volume16
Issue number15
DOIs
Publication statusPublished - 18 May 2016

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The full text is also available from: http://dx.doi.org/10.1109/JSEN.2016.2570420

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Keywords

  • Current measurement
  • Engines
  • Monitoring
  • Temperature sensors
  • Wireless communication
  • Wireless sensor networks

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