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International Journal of Sensors, Wireless Communications and Control

Author(s): Albert Sagala*, Ramot Lubis, Gomgom Silalahi, Estika V. Ginting and Andreas J.D. Simorangkir

DOI: 10.2174/2210327913666230217150456

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Experiment on Multi-hop LoRa for Tracking Application

Page: [29 - 39] Pages: 11

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Abstract

Background: The Internet of Things (IoT) is an embryonic model that converts realworld things (objects) into smarter devices. IoT is applicable to a variety of application domains, including healthcare, smart grid, and agriculture. Low Power Wide Area Network (LPWAN) technology can transmit data over long distances with a low data rate without using the internet. Therefore, this technology is suitable for sending sensor measurement data in Internet of Things (IoT) applications. LPWANs, such as LoRa, use a star topology to reach their coverage to the maximum power that can be transmitted, considering the environmental conditions in the test area and the LoRa parameters used. Whereas for application development in rural areas, there is no internet connection, and often longer coverage is required from the sensor node to the gateway.

Objective: This study aims to increase the transmission range from the end node to the gateway by adding an intermediate node. It is used as a relay from the end node to the gateway.

Method: Static routing was applied so that any broadcast data from the end node would be forwarded first to the intermediate node and then to the gateway.

Results: The LoRa transmission range expanded by changing the topology from peer-to-peer to multi-hop. An intermediate node between the transmitter (end node) and the gateway is available. In the experiment performed, a multi-hop with static routes successfully expanded the distance from 150 meters (single hop) to 250 meters (multi-hop), with a packet delivery ratio of 97%. In this experiment, GPS Ublox Neo was used for the sensor position and was successfully tested on the end node with an accuracy rate of 2.4% for latitude and 0.2% for longitude.

Conclusion: The transmission range from the sensor node to the gateway can be extended using static routing by installing an intermediate node between the gateway and the sensor node. The data from the end node is successfully received by the gateway.

Keywords: LoRa tracking, LPWAN, multi-hop, energy efficiency, wireless sensor networks, internet of things, GPS ublox neo.

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