SeeGull
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Reference Manual
PCTEL, Inc.
Page 36
Rev F
10. Appendix B: NB-IoT Measurements
10.1.
NB-IoT: Introduction
PCTEL is introducing a new measurement to quantify the KPI metrics of the NB-IoT
network. This application note will discuss the new features of this measurement.
10.2.
NB-IoT Physical Layer
The NB-IoT physical channels can be located as a stand-alone network or they could be
part of a standard LTE network in Guard-band and In-Band spectrum. Below is a representation
of these signals.
Figure 24 - NB-IoT
10.3.
Top N NB-IoT Signal Measurement
Below is a list of key features of the new measurement.
•
The NB-IoT carrier follows the 3GPP FD-LTE channel raster. It has a channel index
value of 100 kHz. To align the NB-IoT signal with standard LTE the 3GPP standard
introduces a
frequency offset
value from the channel raster. The values of the
offset
could be 0, +/-2.5 kHz and +/- 7.5 kHz. The scanner will calculate this value as
explained below.
•
The user must select the ‘operation mode’ to determine whether the network is stand-
alone, Guard-band or In-Band.
•
When the user selects the ‘stand-alone’ they must provide the
channel
or
frequency
of
the NB-IoT network. In this mode the scanner calculates the
frequency offset
as zero.
•
When the user selects the ‘In-Band’ operation mode the scanner calculates the
frequency offset from the channel raster as shown in the second column of Table 1.
