Journal ArticleDOI
Monitoring of Large-Area IoT Sensors Using a LoRa Wireless Mesh Network System: Design and Evaluation
Huang-Chen Lee,Kai-Hsiang Ke +1 more
TLDR
This is the first academic study discussing LoRa mesh networking in detail and evaluating its performance via real experiments, and it is shown that in urban areas, LoRa requires dense deployment of LoRa gateways to ensure that indoor LoRa devices can successfully transfer data back to remote GWs.Abstract:
Although many techniques exist to transfer data from the widely distributed sensors that make up the Internet of Things (IoT) (e.g., using 3G/4G networks or cables), these methods are associated with prohibitively high costs, making them impractical for real-life applications. Recently, several emerging wireless technologies have been proposed to provide long-range communication for IoT sensors. Among these, LoRa has been examined for long-range performance. Although LoRa shows good performance for long-range transmission in the countryside, its radio signals can be attenuated over distance, and buildings, trees, and other radio signal sources may interfere with the signals. Our observations show that in urban areas, LoRa requires dense deployment of LoRa gateways (GWs) to ensure that indoor LoRa devices can successfully transfer data back to remote GWs. Wireless mesh networking is a solution for increasing communication range and packet delivery ratio (PDR) without the need to install additional GWs. This paper presents a LoRa mesh networking system for large-area monitoring of IoT applications. We deployed 19 LoRa mesh networking devices over an $800\,\,\text {m} \times 600$ m area on our university campus and installed a GW that collected data at 1-min intervals. The proposed LoRa mesh networking system achieved an average 88.49% PDR, whereas the star-network topology used by LoRa achieved only 58.7% under the same settings. To the best of our knowledge, this is the first academic study discussing LoRa mesh networking in detail and evaluating its performance via real experiments.read more
Citations
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Journal ArticleDOI
RTS: A Robust and Trusted Scheme for IoT-Based Mobile Wireless Mesh Networks
TL;DR: A robust and trusted scheme (RTS) for IoT-based mobile mesh networks to provide reliable routing, data confidentiality, and integrity, and a secure and authentic data protection technique is proposed using public-private key cryptography, which aims to increase the protection of mesh clients with minimal overhead.
Journal ArticleDOI
Routing in LoRaWAN: Overview and Challenges
TL;DR: The main approaches to build multihop communication in LoRa networks are presented, and different routing protocols proposed for the technology are described, to improve the performance of routing protocols for LoRaWAN.
Journal ArticleDOI
Collection of Data With Drones in Precision Agriculture: Analytical Model and LoRa Case Study
TL;DR: This article study analytically how close the drone, that uses a LoRa radio, needs to fly over the sensors to collect data with a given quality of data collection to properly solve some tradeoff related to field size vs autonomy of the drones and the path used by the latter when collecting the data.
Journal ArticleDOI
LoRa-Based Precision Wireless Structural Health Monitoring System for Bolted Joints in a Smart City Environment
TL;DR: An IoT sensor node named TenSense M30 is proposed, which leverages Long Range (LoRa) communication technology to enable wide communication coverage and long life for monitoring the health of bolted joints in a Smart City environment.
Journal ArticleDOI
IoT-based application for construction site safety monitoring
TL;DR: Hong Kong construction safety has witnessed substantial improvement in the last three decades, however, accidents still occur frequently as more than 4,000 accidents were reported in the year 2017.
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Posted Content
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Proceedings ArticleDOI
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