Sigfox the world’s leading IoT Provider
Sigfox is the world’s leading provider of connectivity for the Internet of Things (IoT). The company has built a global network to connect billions of devices to the Internet while consuming as little energy as possible, as simply as possible.
Ultra narrow band
Sigfox uses 200 kHz of the publicly available and unlicensed bands to exchange radio messages over the air (868 to 869 MhZ and 902 to 928 MHz depending on regions). Sigfox uses Ultra Narrow Band (UNB) technology combined with DBPSK and GFSK modulation. Each message is 100 Hz wide and transferred at 100 or 600 bits per second data rate depending on the region.
Random access to the radio frequency resource
The transmission is unsynchronized between the devices and the network. They broadcast each message 3 times on 3 different frequencies (frequency hopping). The base stations monitor the spectrum and look for UNB signals to demodulate.
Sigfox has tailored a lightweight protocol to handle small messages. An uplink message has a maximum 12-bytes payload and a downlink of 8 bytes. For a 12 bytes data payload, a Sigfox frame will use 26 bytes in total.