Radio Technology Keypoints

Sigfox uses Ultra Narrow Band (UNB) radio technology and operates in the unlicensed bands (ISM). Radio messages handle by the Sigfox network are small (12-bytes payload in uplink, 8 bytes in uplink) thanks to lightweight protocol.
Next Slide Previous Slide
Ultra narrow band

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.

Sigfox and the radio frequency resource

Sigfox and the radio frequency resource

Sigfox uses a very small part of the radio frequency resource. Discover how Sigfox signals look like at the base station level.

Random access to the radio frequency resource

Random access to the radio frequency resource

The transmission is unsynchronized between the device and the network. The device broadcasts each message 3 times on 3 different frequencies (frequency hopping). The base stations monitor the spectrum and look for UNB signals to demodulate.

Next Slide Previous Slide
Small messages

Small messages

Sigfox has tailored a lightweight protocol to handle small messages. An uplink message has a maximum 12-bytes payload and a downlink an 8 bytes one. For a 12 bytes data payload, a SIGFOX frame will use 26 bytes in total.

The Sigfox protocol stack is royalty free

The Sigfox protocol stack is royalty free

The Sigfox protocol stack is the software used by connected devices modem to generate radio frames and thus transmit messages over the Sigfox global network. The Sigfox protocol stack is provided free of charge to modem manufacturers. It is embedded in millions of chipsets, system on chips or modules. No royalties are charged.