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Sensors 2016, 16(9), 1536; doi:10.3390/s16091536

Increasing the Lifetime of Mobile WSNs via Dynamic Optimization of Sensor Node Communication Activity

National Institute of Telecommunications—Inatel Av. João de Camargo 510, Santa Rita do Sapucaí, MG 37540-000, Brazil
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Academic Editor: Leonhard M. Reindl
Received: 21 July 2016 / Revised: 3 September 2016 / Accepted: 9 September 2016 / Published: 20 September 2016
(This article belongs to the Section Sensor Networks)
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Abstract

In this paper, a simple and flexible method for increasing the lifetime of fixed or mobile wireless sensor networks is proposed. Based on past residual energy information reported by the sensor nodes, the sink node or another central node dynamically optimizes the communication activity levels of the sensor nodes to save energy without sacrificing the data throughput. The activity levels are defined to represent portions of time or time-frequency slots in a frame, during which the sensor nodes are scheduled to communicate with the sink node to report sensory measurements. Besides node mobility, it is considered that sensors’ batteries may be recharged via a wireless power transmission or equivalent energy harvesting scheme, bringing to the optimization problem an even more dynamic character. We report large increased lifetimes over the non-optimized network and comparable or even larger lifetime improvements with respect to an idealized greedy algorithm that uses both the real-time channel state and the residual energy information. View Full-Text
Keywords: convex optimization; energy harvesting; greedy algorithm; lifetime optimization; mobile wireless sensor networks; wireless power transmission convex optimization; energy harvesting; greedy algorithm; lifetime optimization; mobile wireless sensor networks; wireless power transmission
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Guimarães, D.A.; Sakai, L.J.; Alberti, A.M.; de Souza, R.A.A. Increasing the Lifetime of Mobile WSNs via Dynamic Optimization of Sensor Node Communication Activity. Sensors 2016, 16, 1536.

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