R&S
®
CMW 500 GSM Applications
GSM TX Measurements
Operating Manual 1202.3986.32 – 03 209
the power vs. time measurement.
8.1.1.8 Conformance Requirements and Limit Settings
Conformance requirements for GSM transmitter tests are specified in standard 3GPP
TS 51.010-1, section 13, "Transmitter Characteristics", and in the related specifications
quoted therein (in particular 3GPP TS 05.05).
The following sections give an overview of the test requirements and the R&S CMW
500 limit settings.
Transmit modulation
Average burst power
Power templates
ACP
Transmit Modulation Limits
A poor modulation accuracy of the mobile transmitter increases the transmission errors
in the uplink channel of the GSM network. The frequency error and the phase error are
the critical quantities to assess the modulation accuracy of a GSM mobile phone.
According to the 3GPP standard, the frequency error, measured at various mobile
transmitter output powers and frequencies, shall not exceed 0.1 ppm (0.2 ppm for
GSM 400). In addition, the RMS phase error, measured after adjustment for the effect
of the frequency error and averaged over all samples in the useful part of the burst,
shall not exceed 5 deg. The peak phase error shall not exceed 20 deg. At each
channel and mobile output power, the measurement shall be repeated with a statistic
length d 20 deg.
The specified limits can be set in the configuration dialog, along with limits for the other
measured quantities (for reference information refer to Modulation Limits).
The table below lists the test requirements of standard 3GPP TS 51.010-1.
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