Part Eight: Robustness
Robustness (or the lack thereof) in the cellular LPWA specifications is another example of cellular folks being clever to specify requirements that are easily achievable. In this case, its simulation based on the TU-1 Hz channel model as stated in TR45.820 : Cellular system support for ultra-low complexity and low throughput Internet of Things (CIOT) lacks realistic expectations. RPMA has been in field deployed for 6 years and we have routinely seen channels in the field that are far more adversarial. We were surprised at the variability of the channel even for stationary devices.
The Typical Urban(TU) 1 Hz channel model is not a realistic model even for stationary devices, yet that is the channel model that governs all of the cellular LPWA simulations.