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    A Study of Air Pollution Smart Sensors LPWAN via NB-IoT for Thailand Smart Cities 4.0
    (2018-08-06)
    Duangsuwan, Sarun
    ;
    Takarn, Aekarong
    ;
    Nujankaew, Rachan
    ;
    Jamjareegulgarn, Punyawi
    The problem of air pollutant has to improve urgently, in particular, approach to smart city in 2024 of Thailand 4.0. This paper presents a development of smart sensors of air pollution to monitor the air quality in smart city. We propose the smart sensors that consist of the particulate matter (PM<inf>10</inf>) or dust sensor, carbon monoxide (CO), carbon dioxide (CO<inf>2</inf>), noise level (dB), and ozone (O<inf>3</inf>) respectively. These sensors are solution of a low power wide area network (LPWAN). In the experiment, the measurement has been investigated in Bangkok metropolitan, and the results show air quality index (AQI) via Norrowband Internet of Things (NB-IoT). The proposed of this paper can help the people know the real-time air quality via IoT as a service.
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    A Beam-Scanning Array Antenna for LPWAN Base Station
    (2018-01-01)
    Ngamjanvaporn, Phaisan
    ;
    Phongcharoenpanich, Chuwong
    ;
    Krairiksh, Monai
    This paper presents a beam-scanning array antenna for LPWAN base station. The two-element array of the pattern reconfigurable Yagi-Uda antennas is designed at the 2.4 GHz ISM band to provide 360° beam-scanning. The characteristics of the array are simulated using the 4NEC2 simulator. By using the pattern reconfigurable elements and with non-uniform amplitude excitation, the simulated results show that the array provides 16 beams covering 360° with 7 dBi gain. Also, the S <inf>11</inf> bandwidth of the array is satisfied to the desired operating frequency.
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    Experimental performance evaluation of LoRaWAN: A case study in Bangkok
    (2017-09-05)
    Vatcharatiansakul, Nuttakit
    ;
    Tuwanut, Panwit
    ;
    Pornavalai, Chotipat
    The Internet of Things (IoT) is a vision which real-world objects are part of the internet. Every object is uniquely identified, and accessible to the network. There are various types of communication protocol for connect the device to the Internet. One of them is a Low Power Wide Area Network (LPWAN) which is a novel technology use to implement IoT applications. There are many platforms of LPWAN such as NB-IoT, LoRaWAN. In this paper, the experimental performance evaluation of LoRaWAN over a real environment in Bangkok, Thailand is presented. From these experimental results, the communication ranges in both an outdoor and an indoor environment are limited. Hence, the IoT application with LoRaWAN technology can be reliable in limited of communication ranges.