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. 2020 Oct 16;20(20):5858. doi: 10.3390/s20205858

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© 2020 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Number of parent node changes vs. various routing protocols (RPL). E2HRC-RPL: energy-efficient heterogeneous ring clustering routing protocol and CT-RPL: cluster tree-based routing protocol.