Rohde & Schwarz R&S CMW-KM300, Руководство пользователя, Страница: 338 / 388

NB-IoT NPRACH Measurement
R&S
®
CMW-KM300/-KS300
338 User Manual 1178.5689.02 ─ 06
4.3.2.5 View Power Dynamics
This single-preamble view shows a diagram and a statistical overview of related power
results.
Figure 4-9: Power Dynamics view
The diagram shows the UE output power vs. time, sampled with 96 T
s
(3.125 µs). The
trace covers the range from -1200 µs to +7596.875 µs relative to the start of the pre-
amble.
In the example screenshot, you can distinguish the four symbol groups. The first two
symbol groups use subcarriers near the edge of the bandwidth. The last two symbol
groups use subcarriers near the center of the bandwidth. At the edge of the bandwidth,
the power is slightly lower than in the center.
The table below the diagram shows ON power and OFF power values. According to
3GPP, the ON power is the mean UE output power over the preamble, i.e. over the
NPRACH measurement period, see
Table 4-1 . In addition to this value, the result table
lists also the peak power within the measurement period. The ON power measurement
period is marked by a green horizontal bar in the diagram.
The OFF power is the mean power during 1 ms before and after the ON power mea-
surement period. A transient period of 20 µs next to the ON power measurement
period is excluded. The transient period is indicated by gray vertical bars in the dia-
gram.
GUI Reference
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