LTE PRACH Measurement
R&S
®
CMW-KM5xx/-KS5xx
754
User Manual 1173.9628.02 ─ 16
Fig. 4-12: LTE PRACH: Power Dynamics
The diagram shows the UE output power vs. time, sampled with 48 T
s
(1.5625 µs). The
trace covers the range from -1100 µs to +2098.4375 µs relative to the start of the pre-
amble.
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
PRACH measurement period - see
. In addition to this mean value the 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 in one subframe (1 ms) before and after the ON
power measurement period, excluding a transient period of 20 µs adjacent to the ON
power measurement period. These transient periods are indicated by gray vertical bars
in the diagram.
Table 4-3: Measurement period for ON power
Preamble format
Measurement period ON power (µs)
0
903.1
1
1484.4
2
1803.1
3
2284.4
4
147.9
General Description
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