Compression Method of Position Information for IoT-based Bus Location System Using LoRaWAN

The authors aim to realize an Internet of Things-based bus location system that can be achieved with low operation cost using Long Range Wide Area Network (LoRaWAN). However, in Japan, when LoRaWAN is operated in the mode where the communication distance is the longest, the data size that can be transmitted at once is limited to 11 bytes. This paper proposes a location information compression method to transmit the time information and the traveling position of the bus under this constraint. When transmitting time and location information acquired from GPS, 280 bits are required in the general method, whereas in the proposed method it can be compressed to 49 bits.