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LTE PRACH Measurement
R&S
®
CMW-KM5xx/-KS5xx
748
User Manual 1173.9628.02 ─ 16
Fig. 4-5: Modulation limit settings
Characteristics
Refer to 3GPP TS 36.521 V9.3.0, section...
Specified Limit
EVM (RMS)
6.5.2.1 Error Vector Magnitude (EVM)
≤ 17.5 %
4.2.8.2
Power Dynamics Limits
Transmission at excessive uplink power increases interference to other channels while
a too low uplink power increases transmission errors. For PRACH transmission 3GPP
defines a time mask to verify the UL power while a preamble is transmitted (transmit
ON power), the UL power in the adjacent subframes (transmit OFF power) and the
power ramping in between.
The ON power is specified as the mean UE output power over the preamble (more
exactly, over the PRACH measurement period, see
mean power has to be measured both in the preceding subframe and in the subse-
quent subframe, excluding a transient period of 20 µs adjacent to the PRACH mea-
surement period.
The following figure provides a summary of the time periods relevant for ON and OFF
power limits.
Fig. 4-6: Measurement periods ON/OFF power
The OFF power shall not exceed -48.5 dBm. The ON power shall be between -8.5
dBm and 6.5 dBm. The limits for ON and OFF power can be set in the configuration
dialog.
General Description
深圳德标仪器
135-1095-0799