Indoor signal propagation of LoRa technology

With an increasing number of small devices, the concept of LPWANs becomes more popular. The most important requirements on LPWANs include long battery lifetime, low price of devices, ability to connect millions of devices and long range coverage; the long range coverage is the most critical issue of this technology. In this paper we discuss indoor signal propagation of LoRa technology. At the beginning of the paper, there is an introduction to LoRa technology. Later, the paper presents a measurement of an indoor propagation of LoRa signal in a reinforced concrete building in Prague, the Czech Republic. The measurement is realized with one mobile transmitter and one receiver with a fixed location for each experiment. The measurement is performed for two experiments, one with the receiver in the basement of the building, one with the receiver on the roof of the building. Results of the measurement are graphically visualized for both measurement experiments at the end of this paper and show that the best signal coverage is for the roof location, where it includes also flats of neighboring entrances.