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Open AccessArticle

Intra-Network Interference Robustness: An Empirical Evaluation of IEEE 802.15.4-2015 SUN-OFDM

1
IDLab, Department of Information Technology, Ghent University—imec, 9052 Ghent, Belgium
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IDLab, Department of Computer Science, University of Antwerp—imec, 2000 Antwerp, Belgium
*
Authors to whom correspondence should be addressed.
Electronics 2020, 9(10), 1691; https://doi.org/10.3390/electronics9101691
Received: 4 September 2020 / Revised: 29 September 2020 / Accepted: 9 October 2020 / Published: 15 October 2020
(This article belongs to the Special Issue Ubiquitous Sensor Networks )
While IEEE 802.15.4 and its Time Slotted Channel Hopping (TSCH) medium access mode were developed as a wireless substitute for reliable process monitoring in industrial environments, most deployments use a single/static physical layer (PHY) configuration. Instead of limiting all links to the throughput and reliability of a single Modulation and Coding Scheme (MCS), you can dynamically re-configure the PHY of link endpoints according to the context. However, such modulation diversity causes links to coincide in time/frequency space, resulting in poor reliability if left unchecked. Nonetheless, to some level, intentional spatial overlap improves resource efficiency while partially preserving the benefits of modulation diversity. Hence, we measured the mutual interference robustness of certain Smart Utility Network (SUN) Orthogonal Frequency Division Multiplexing (OFDM) configurations, as a first step towards combining spatial re-use and modulation diversity. This paper discusses the packet reception performance of those PHY configurations in terms of Signal to Interference Ratio (SIR) and time-overlap percentage between interference and targeted parts of useful transmissions. In summary, we found SUN-OFDM O3 MCS1 and O4 MCS2 performed best. Consequently, one should consider them when developing TSCH scheduling mechanisms in the search for resource efficient ubiquitous connectivity through modulation diversity and spatial re-use. View Full-Text
Keywords: IEEE 802.15.4; interference; IoT; modulation diversity; spatial re-use; smart utility networks; SUN-OFDM; TSCH IEEE 802.15.4; interference; IoT; modulation diversity; spatial re-use; smart utility networks; SUN-OFDM; TSCH
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Elsas, R.; Hoebeke, J.; Van Leemput, D.; Shahid, A.; Daneels, G.; Famaey, J.; De Poorter, E. Intra-Network Interference Robustness: An Empirical Evaluation of IEEE 802.15.4-2015 SUN-OFDM. Electronics 2020, 9, 1691.

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