WCDMA TPC Measurement
R&S
®
CMW-KG4xx/-KM4xx/-KS4xx
782
User Manual 1173.9657.02 ─ 11
Fig. 4-5: Minimum output power limit
To test the minimum output power you can use the "TPC Test Step" setups E, EF and
GH.
If the measured minimum output power is out of tolerance, please first ensure that the
configured external attenuation value corresponds to your setup, see
4.2.6.3
Power Step and Power Step Group Limits (Inner Loop Power)
When the UE receives Transmit Power Control (TPC) commands in the downlink it is
expected to adjust its output power in accordance with the received commands. A TPC
command orders the UE to increase or decrease the output power by a certain
amount, the expected step size.
3GPP defines upper limits for the power step error, depending on the expected step
size. In addition to error limits for single power steps, there are also error limits for
groups of 10 or 50 power steps.
The configuration dialog allows to set symmetrical error limits for single power steps
and power step groups, depending on the expected step size.
Fig. 4-6: Power step (group) limit settings
The test requirements are defined in 3GPP TS 34.121, section 5.4.2 "Inner Loop
Power Control in the Uplink". An overview is provided in the following tables. The
default limit values correspond to the test requirements.
Table 4-2: Allowed step sizes for single TPC steps
Expected Step Size
Error Limit
Allowed Step Size
Relevant for Test Step
0 dB
±
0.6 dB
-0.6 dB to +0.6 dB
A, B, C
±
1 dB
±
0.6 dB
+0.4 dB to +1.6 dB
B, F
-0.4 dB to -1.6 dB
C, E
General Description
深圳德标仪器
135-1095-0799