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NB-IoT NPRACH Measurement
R&S
®
CMW-KM300/-KS300
349
User Manual 1178.5689.02 ─ 06
Figure 4-16: Modulation limit settings
Remote command:
CONFigure:NIOT:MEAS<i>:PRACh:LIMit:EVMagnitude
CONFigure:NIOT:MEAS<i>:PRACh:LIMit:MERRor
CONFigure:NIOT:MEAS<i>:PRACh:LIMit:PERRor
CONFigure:NIOT:MEAS<i>:PRACh:LIMit:FERRor
4.3.6.2
Power Dynamics Limits
Access: "NPRACH" tab > "Config" hotkey > "Limits" > "Power" > "Dynamics" section.
Transmission at excessive uplink power increases interference to other channels. A too
low uplink power increases transmission errors. For NPRACH transmission, 3GPP
defines a time mask. The mask contains limits for the UL power during preamble trans-
mission (transmit ON power), without preamble transmission (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 NPRACH measurement period, see
the mean power has to be measured for 1 ms before and after the preamble. A transi-
ent period of 20 µs next to the NPRACH measurement period is excluded.
The following figure provides a summary of the time periods relevant for ON and OFF
power limits.
Preamble
ON power requirement
(NPRACH measurement period)
20 µs
20 µs
OFF power requirement
(1 ms – 20 µs)
1 ms (OFF)
1 ms (OFF)
OFF power requirement
(1 ms – 20 µs)
Figure 4-17: Measurement periods for ON/OFF power
The OFF power must not exceed -48.5 dBm. The ON power must be in the range
-18.5
dBm to -3.5 dBm.
GUI Reference
深圳德标仪器
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