• Title/Summary/Keyword: Low Power Wide Area Network(LPWAN)

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Performance Analysis of LoRa(Long Range) according to the Distances in Indoor and Outdoor Spaces (실내·외 공간에서 거리에 따른 LoRa(Long Range) 성능 분석)

  • Lim, Junyeong;Lee, Jaemin;Kim, Donghyun;Kim, Jongdeok
    • Journal of KIISE
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    • v.44 no.7
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    • pp.733-741
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    • 2017
  • LPWAN(Low Power Wide Area Network) technology is M2M (Machine to Machine) networking technology for the Internet of Things. The technology is designed to support low-power, long-distance and low-speed communications that are typical of LoRaWAN(Long Range Wide Area Network). To exchange inter-object information using a LoRaWAN, the link performances for various environments must be known. however, active performance analysis research that is based on an empirical environment is nonexistent. Therefore, this paper empirically evaluates the performance of the LoRa (Long Range) link, a physical communication technology of the LoRaWAN for various variables that may affect the link quality in indoor and outdoor environments. To achieve this, a physical performance monitoring system was designed and implemented. A communication experiment environment was subsequently constructed based on the indoor and outdoor conditions. The SNR(Signal to Noise Ratio), RSSI(Received Signal Strength Indication), and the PDR(Packet Delivery Ratio) were evaluated.

LoRa LPWAN Sensor Network for Real-Time Monitoring and It's Control Method (실시간 모니터링을 위한 LoRa LPWAN 기반의 센서네트워크 시스템과 그 제어방법)

  • Kim, Jong-Hoon;Park, Won-Joo;Park, Jin-Oh;Park, Sang-Hyun
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.31 no.6
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    • pp.359-366
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    • 2018
  • Social infrastructure facilities that have been under construction since the country's high-growth period are undergoing rapid aging, and safety assessments of large structures such as bridge tunnels, which can be directly linked to large-scale casualties in the event of an accident, are necessary. Wireless smart sensor networks that improve SHM(Structural Health Monitoring) based on existing wire sensors are difficult to construct economical and efficient system due to short signal reach. The LPWAN, Low Power Wide Area Network, is becoming popular with the Internet of Things and it is possible to construct economical and efficient SHM by applying it to structural health monitoring. This study examines the applicability of LoRa LPWAN to structural health monitoring and proposes a channel usage pre-planning based LoRa network operation method that can efficiently utilize bandwidth while resolving conflicts between channels caused by using license - exempt communication band.

Can energy optimization lead to economic and environmental waste in LPWAN architectures?

  • Rady, Mina;Georges, Jean-Philippe;Lepage, Francis
    • ETRI Journal
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    • v.43 no.2
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    • pp.173-183
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    • 2021
  • As low-power wide-area network (LPWAN) end devices (EDs) are deployed in massive scale, their economic and environmental costs of operation are becoming too significant to ignore and too difficult to estimate. While LPWAN architectures and protocols are designed to primarily save energy, this study shows that energy saving does not necessarily lead to lower cost or environmental footprint of the network. Accordingly, a theoretical framework is proposed to estimate the operational expenditure (OpEx) and environmental footprint of LPWAN EDs. An extended constrained optimization model is provided for the ED link assignment to gateways (GWs) based on heterogeneous ED configurations and hardware specifications. Based on the models, a simulation framework is developed which demonstrates that OpEx, energy consumption, and environmental footprint can be in conflict with each other as constrained optimization objectives. We demonstrate different ways to achieve compromises in each dimension for overall improved network performance.

Development of Science IoT Network (ScienceLoRa) using Low Power Wide Area Technologies (저전력 장거리 통신기술을 이용한 과학기술 IoT 네트워크 (ScienceLoRa) 개발)

  • Kim, Joobum;Seok, Woojin;Kwak, Jaiseung;Kim, Kiwook
    • KNOM Review
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    • v.22 no.2
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    • pp.29-38
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    • 2019
  • The rapid growth of IoT (Internet of Things) owing to the advancement and spread of technologies such as wireless networks, communication modules, sensors, smart terminals, etc. enables the development of new services in diverse public and private sectors. In particular, research on IoT technology and its applications has increased in the field of science. To establish an IoT infrastructure in this field, KREONET launched the wireless IoT network, called ScienceLoRa, based on low power wide area network (LPWAN). ScienceLoRa aims to collect a variety of data from sensors and utilize and analyze the collected data for research in a variety of scientific fields. In this article, the authors present the concept, current status, applications and future plans of ScienceLoRa.

Optimize OTDOA-based Positioning Accuracy by Utilizing Multiple Linear Regression Model under NB-IoT Technology (NB-IoT 기술에서 Multiple Linear Regression Model을 활용하여 OTDOA 기반 포지셔닝 정확도 최적화)

  • Pan, Yichen;Kim, Jaesoo
    • Proceedings of the Korean Society of Computer Information Conference
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    • 2020.07a
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    • pp.139-142
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    • 2020
  • NB-IoT(Narrow Band Internet of Things) is an emerging LPWAN(Low Power Wide Area Network) radio technology. NB-IoT has many advantages like low power, low cost, and high coverage. However low bandwidth and low sampling rates also lead to poor positioning accuracy. This paper proposed a solution to optimize positioning accuracy under the OTDOA(Observed Time Difference of Arrival) approach by utilizing MLR(Multiple Linear Regression) models. Through the MLR model to predict the influence degree of weather(temperature, humidity, light intensity and air pressure) on the arrival time of signal transmission to improve the measurement accuracy. The improvement of measurement accuracy can greatly improve IoT applications based on NB-IoT.

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Development of a System for Field-data Collection Transmission and Monitoring based on Low Power Wide Area Network (저전력 광역통신망 기반 현장데이터 수집 전송 및 모니터링 시스템 개발)

  • Yeong-Tae, Ju;Jong-Sil, Kim;Eung-Kon, Kim
    • The Journal of the Korea institute of electronic communication sciences
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    • v.17 no.6
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    • pp.1105-1112
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    • 2022
  • Field data monitoring systems such as renewable energy generation and smart farm integrated control are developing from PC and server to mobile first, and various wireless communication and application services have emerged with the development of IoT technology. Low-power wide-area networks are services optimized for low-power, low-capacity, and low-speed data transmission, and data collected in the field is transmitted to designated storage servers or cloud-based data platforms, enabling data monitoring. In this paper, we implement an IoT repeater that collects field data with a single device and transmits it to a wireless carrier cloud data flat using a low-power wide-area network, and a monitoring app using it. Using this, the system configuration is simpler, the cost of deployment and operation is lower, and effective data accumulation is possible.

Structural Health Monitoring System for Large-Bridge-Based LoRa LPWAN (LoRa LPWAN 기반의 대형 교량 구조건전성 모니터링 시스템)

  • Jin-Oh Park;Ki-Don Kim;Kyung-soo Kim;Sang-Heon Park
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.36 no.1
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    • pp.49-56
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    • 2023
  • With the development of technology worldwide, bridges are becoming larger, and the number of old bridges is also rapidly increasing. Monitoring the structural health of large, aging bridges is essential to preventing large-scale accidents. In this study, the application of a LoRa low-power wide-area network (LPWAN)-based wireless measurement system was investigated, and a LoRa wireless measurement system was established in the cable-stayed bridge section of Cheonsa Bridge, located in Shinan-gun, Jeollanam-do, Korea. The applicability of the LoRa LPWAN-based wireless monitoring system to large marine bridges was reviewed by comparing the performance and economic feasibility with wire-based monitoring systems that were built and operated by establishing a measurement system for the pylons, cables, and reinforcing girders of the bridge.

Design and Implementation of Remote Device Management System based on LoRa Communication (LoRa 통신기반 원격 장비 관리 시스템 설계 및 구현)

  • Kim, Dong-Hyun;Lee, Chang-Hong;Kim, Jong-Deok
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.24 no.12
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    • pp.1654-1661
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    • 2020
  • Internet of Things(IoT) technology can remotely collect and control a sensing information of device by attaching a small communication device to equipment that does not support communication. Low-Power Wide-Area Network (LPWAN), a low-power, long-distance communication technology, was proposed to support IoT technology, and Long Range(LoRa) is representative. Various systems, including network device, can collect and control the status information of device in real time through remote access. However, when a network failure occurs, remote access and status monitoring are impossible unless there is a separate additional network. To overcome this problem, in this paper, we propose an independent remote device management system that can be easily attached to device, which monitors and controls equipment remotely using an independent network. We will design and implement the proposed system, via which we will show its practicality and expandability.

LoRa LPWAN-based Wireless Measurement Sensor Installation and Maintenance Plan (LoRa LPWAN 기반의 무선 계측센서 설치 및 유지관리 방안)

  • Kim, Jong-Hoon;Park, Won-Joo;Park Sang-Hyun, Jin-Oh
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.33 no.1
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    • pp.55-61
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    • 2020
  • Social infrastructure facilities that have been under construction since the country's high-growth period are undergoing rapid aging, and, thus, safety assessments of large structures such as bridge tunnels, which can be directly linked to large-scale casualties in the event of an accident, are necessary. It is difficult to construct economical and efficient wireless smart sensor networks that improve structural health monitoring (SHM) because the existing wire sensors have a short signal reach. However, low-power wide-area networks (LPWANs) are becoming popular within the Internet of Things, and enable economical and efficient SHM. In this study, the technology trends of a wireless measuring sensor based on LoRa LPWANs were investigated, and an installation and maintenance plan for this type of sensor is proposed.

Analysis of Low-power-based Communication Technology to Build a Mobility Connected System (모빌리티 커넥티드 시스템 구축을 위한 저전력 기반 통신 기술 분석)

  • Sung-goo Yoo;Ju-yeon Lee
    • Journal of the Institute of Convergence Signal Processing
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    • v.25 no.1
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    • pp.33-38
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    • 2024
  • The importance of connected technology that connects products or systems is increasing. Connected technology is a concept that can communicate with surrounding objects and connect to each other through a network to operate as one system. In particular, it can be implemented using wireless communication, and various conditions are required depending on the application system, such as communication distance and speed. In this study, we analyzed trends in communication technology for the implementation of connectivity between mobility devices such as self-driving cars, drones, UAVs, and shared mobility devices. The communication distance, speed, wired and wireless status, etc. of the latest communication methods currently commercialized or under development were investigated, with a particular focus on low-power operation. We identified the element technologies needed to build a low-power long-distance communication (LPWAN) system, and initially developed a plan for constructing a connected drone. The analysis results showed that it was possible to implement a connected system using the LoRa system, and an example configuration method was presented.