Rohde & Schwarz R&S CMW-KM300, User Manual

Page: 239 / 388

NB-IoT Multi-Evaluation Measurement
R&S
®
CMW-KM300/-KS300
239 User Manual 1178.5689.02 ─ 06
3.3.6 Limit Settings
The following sections give an overview of the NB-IoT multi-evaluation limit settings
and the related conformance test requirements.
Conformance requirements for NB-IoT UE transmitter tests are specified in 3GPP TS
36.521, section 6, "Transmitter Characteristics".
● EVM, Magnitude Error and Phase Error Limits .....................................................239
● Frequency Error Limits ..........................................................................................240
● I/Q Origin Offset Limits ..........................................................................................240
● Inband Emissions Limits ....................................................................................... 241
● Occupied Bandwidth Limits ...................................................................................242
● Spectrum Emission Mask ......................................................................................242
● ACLR Limits .......................................................................................................... 243
● Power Dynamics Limits .........................................................................................244
3.3.6.1 EVM, Magnitude Error and Phase Error Limits
Access: "Config" hotkey > "Limits" > "Modulation" section.
A poor modulation accuracy of the UE transmitter increases the transmission errors in
the uplink channel of the network and decreases the system capacity. The error vector
magnitude (EVM) is the critical quantity to assess the modulation accuracy of an NB-
IoT UE.
According to 3GPP, the EVM measured at UE output powers ≥ -40 dBm must not
exceed 17.5 %.
Characteristics Refer to 3GPP TS 36.521 V14.2.0, section... Specified limit
EVM (RMS) 6.5.2.1F.1 Error Vector Magnitude (EVM) for category NB1 ≤ 17.5 %
EVM, magnitude error, phase error limit settings
The EVM limits can be set in the configuration dialog, along with limits for the other
measured quantities.
Figure 3-20: Limit settings for EVM, magnitude and phase error
Remote command:
CONFigure:NIOT:MEAS<i>:MEValuation:LIMit:EVMagnitude
CONFigure:NIOT:MEAS<i>:MEValuation:LIMit:MERRor
CONFigure:NIOT:MEAS<i>:MEValuation:LIMit:PERRor
GUI Reference
深圳德标仪器
135-1095-0799