WCDMA PRACH Measurement
R&S
®
CMW-KG4xx/-KM4xx/-KS4xx
853
User Manual 1173.9657.02 ─ 11
The test requirements for the individual UE power classes are defined in 3GPP TS
34.121, section 5.2 "Maximum Output Power" and listed in the following table.
The measured power of all preambles must not exceed the "Nominal Maximum Power"
+ "Upper Limit".
The "Lower Limit" is relevant for power steps, see
chapter 5.2.6.5, "Power Step Limits"
UE Power Class
Nominal Maximum Power
Tolerances (Upper and Lower Limit)
Class 1
33 dBm
+1.7 dB, -3.7 dB
Class 2
27 dBm
Class 3
24 dBm
Class 3bis
23 dBm
+2.7 dB, -2.7 dB
Class 4
21 dBm
5.2.6.3
Open Loop Power Limits
The UE shall calculate the output power for the first transmitted preamble from system
information received via the BCCH and from the received signal power level of the
CPICH.
According to 3GPP TS 34.121, section 5.4.1 "Open Loop Power Control in the Uplink",
the tolerance for the power of the first preamble is
±
10 dB under normal conditions and
±
13 dB under extreme conditions.
You can define the expected power of the first (initial) preamble and a symmetrical tol-
erance value in the configuration dialog.
When the combined signal path scenario is active, the initial preamble power parame-
ter is controlled by the signaling application.
Fig. 5-5: Open loop power limit
5.2.6.4
Off Power Limit
The UE power measured when the UE transmitter is off is called "OFF power". Accord-
ing to 3GPP TS 34.121, section 5.5.1 "Transmit OFF Power", the measured value
must be below -55 dBm. The same limit is defined in section 5.5.2 "Transmit ON/OFF
Time Mask".
You can set a corresponding upper limit in the configuration dialog. It is applied to the
OFF power measured before and after the last preamble received by the R&S
CMW.
General Description
深圳德标仪器
135-1095-0799