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Title: Synchronous LoRa mesh network to monitor processes in underground infrastructure
Authors : Ebi, Christian
Schaltegger, Fabian
Rüst, Peter Andreas
Blumensaat, Frank
Published in : IEEE access
Volume(Issue) : 7
Pages : 57663
Pages to: 57677
Publisher / Ed. Institution : IEEE
Issue Date: 2019
License (according to publishing contract) : CC BY 3.0: Attribution 3.0 Unported
Type of review: Peer review (publication)
Language : English
Subjects : Environmental engineering; Internet of Things; LoRaWAN; Mesh network; Water pollution; Wide area network; Wireless sensor network; Urban drainage
Subject (DDC) : 004: Computer science
Abstract: Collecting precise real-time information on urban drainage system performance is essential to identify, predict, and manage critical loading situations, such as urban flash floods and sewer overflows. Although emerging low-power wireless communication techniques allow efficient data transfers with great above-ground performance, for underground or indoor applications in a large coverage range are difficult to achieve due to physical and topological limitations, particularly in dense urban areas. In this paper, we first discuss the range limitations of the LoRaWAN standard based on a systematic evaluation of a long-term operation of a sensor network monitoring in-sewer process dynamics. Analyses reveal an-on average-five-fold higher data packet loss for sub-surface nodes, which steadily grows with increasing distance to the gateway. Second, we present a novel LPWAN concept based on the LoRa technology that enhances transmission reliability, efficiency, and flexibility in range-critical situations through meshed multi-hop routing and ensures a precise time-synchronization through optional GPS or DCF77 long-wave time signaling. Third, we illustrate the usefulness of the newly developed concept by evaluating the radio transmission performance for two independent full-scale field tests. Test results show that the synchronous LoRa mesh network approach clearly outperforms the standard LoRaWAN technique with regard to the reliability of packet delivery when transmitting from range-critical locations. Hence, the approach is expected to generally ease data collection from difficult-to-access locations such as underground areas.
Departement: School of Engineering
Organisational Unit: Institute of Embedded Systems (InES)
Publication type: Article in scientific journal
DOI : 10.21256/zhaw-3244
ISSN: 2169-3536
Appears in Collections:Publikationen School of Engineering

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