  NB-IoT is the 3GPP standard for machine-to-machine communications, recently
finalized within LTE release 13. This article gives a brief overview about this
new LTE-based radio access technology and presents a implementation developed
using the srsLTE software radio suite. We also carry out a performance study in
which we compare a theoretical analysis with experimental results obtained in
our testbed. Furthermore, we provide some interesting details and share our
experience in exploring one of the worldwide first commercial NB-IoT
deployments.
