On Placement of End Devices in LPWAN Based WSN for Environmental Monitoring Applications

In order to understand the heat island phenomenon or air pollution caused by PM2.5, it is necessary to accurately measure physical quantities, which can be measured systems based on a wireless sensor network (WSN). For the purpose, it is necessary to consider the optimal placement of sensors considering cost for the installation. We develop 920MHz band wireless sensor network for the measurement of some quantities including temperature, relative humidity, atmospheric pressure and dust. The developed system is based on LoRa networks. We measure these quantities in the actual environment (Kamihama campus at Mie University) and consider the tendency of the measured value for each observed quantities. In this paper, based on the measurement results, the spatially and temporally characteristics of each measured quantity for the optimal placement of EDs in LPWAN based WSN.