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Article

Collision-Free Transmissions in an IoT Monitoring Application Based on LoRaWAN

1
RAMSIS Team, CRISTAL Laboratory, 2010 Campus University, 2010 Manouba, Tunisia
2
EVA Project, Inria—Paris, 75012 Paris, France
3
CEDRIC/CNAM, 75003 Paris, France
*
Author to whom correspondence should be addressed.
Sensors 2020, 20(14), 4053; https://doi.org/10.3390/s20144053
Received: 5 June 2020 / Revised: 15 July 2020 / Accepted: 16 July 2020 / Published: 21 July 2020
(This article belongs to the Section Internet of Things)
With the Internet of Things (IoT), the number of monitoring applications deployed is considerably increasing, whatever the field considered: smart city, smart agriculture, environment monitoring, air pollution monitoring, to name a few. The LoRaWAN (Long Range Wide Area Network)architecture with its long range communication, its robustness to interference and its reduced energy consumption is an excellent candidate to support such applications. However, if the number of end devices is high, the reliability of LoRaWAN, measured by the Packet Delivery Ratio (PDR), becomes unacceptable due to an excessive number of collisions. In this paper, we propose two different families of solutions ensuring collision-free transmissions. The first family is TDMA (Time-Division Multiple Access)-based. All clusters transmit in sequence and up to six end devices with different spreading factors belonging to the same cluster are allowed to transmit in parallel. The second family is FDMA (Frequency Divsion Multiple Access)-based. All clusters transmit in parallel, each cluster on its own frequency. Within each cluster, all end devices transmit in sequence. Their performance are compared in terms of PDR, energy consumption by end device and maximum number of end devices supported. Simulation results corroborate the theoretical results and show the high efficiency of the solutions proposed. View Full-Text
Keywords: IoT; LPWAN; LoRaWAN; monitoring application; reliability; scalability; collision-free; TDMA; FDMA; air pollution monitoring IoT; LPWAN; LoRaWAN; monitoring application; reliability; scalability; collision-free; TDMA; FDMA; air pollution monitoring
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MDPI and ACS Style

Haiahem, R.; Minet, P.; Boumerdassi, S.; Azouz Saidane, L. Collision-Free Transmissions in an IoT Monitoring Application Based on LoRaWAN. Sensors 2020, 20, 4053. https://doi.org/10.3390/s20144053

AMA Style

Haiahem R, Minet P, Boumerdassi S, Azouz Saidane L. Collision-Free Transmissions in an IoT Monitoring Application Based on LoRaWAN. Sensors. 2020; 20(14):4053. https://doi.org/10.3390/s20144053

Chicago/Turabian Style

Haiahem, Rahim, Pascale Minet, Selma Boumerdassi, and Leila Azouz Saidane. 2020. "Collision-Free Transmissions in an IoT Monitoring Application Based on LoRaWAN" Sensors 20, no. 14: 4053. https://doi.org/10.3390/s20144053

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