The resources in the sub-GHz, unlicensed spectrum are limited and traffic generated from other technologies is steadily increasing.
Therefore, Weightless uses narrowband 12.5kHz channels and still manages to carry 7* times more data per kHz than Sigfox and 98* times more data per kHz than LoRaWAN in urban settings.
*bps/kHz is based on HATA urban model simulation - see full HATA simulation here
single channel bandwidth
Synchronous Network (TDMA/FDMA)
Organised, synchronous networking means every device and base station knows exactly when to talk and when to listen. This is identical to our reliable cellular networks that our cell phones depend on. Without it, high collision rates will occur. Time division multiple access (TDMA) is a channel access method for shared medium networks. It allows several users to share the same frequency channel by dividing the signal into different time slots. FDMA is another channel access method giving users an individual allocation of one or several frequency bands and coordinates access between multiple users. LoRaWAN and Sigfox are NOT synchronous networks.