WCDMA TPC Measurement
R&S
®
CMW-KG4xx/-KM4xx/-KS4xx
773
User Manual 1173.9657.02 ─ 11
Mandatory measurement settings
You must adjust at least the following measurement settings to the properties of the
analyzed UL WCDMA signal and the TPC commands to be sent to the UE. For com-
bined signal path measurements, most of these settings are controlled by the signaling
application.
●
Analyzer "Frequency"
●
"Expected Nominal Power", "User Margin" and "External Attenuation (Input)"
–
For combined signal path measurements, let the signaling application calculate
the expected nominal power from the UL power control settings (expected
nominal power mode = "According to UL Power Control Settings"). Do not use
the manual mode.
–
For standalone measurements, set the "Expected Nominal Power" to the
expected peak power of the UE signal during the measurement. Even if you
start the measurement with minimum UE power, consider the maximum power
expected at a later stage of the measurement. Set the "User Margin" to 0 dB.
●
"TPC Setup"
Select the TPC setup corresponding to the TPC pattern that will be sent to the UE.
For details see
●
"Trigger Source"
–
For combined signal path measurements, the trigger source is configured auto-
matically when you select the TPC setup.
–
For standalone measurements, select a suitable trigger signal provided by the
application that sends the TPC commands to the UE.
chapter 4.2.4, "Trigger Modes"
Furthermore, it is recommended to disable the sending of UE measurement reports,
because they cause power steps. For combined signal path measurements, disable
the reports in the "WCDMA Signaling Configuration" dialog, section "UE Measurement
Report".
Detailed step-by-step instructions for combined signal path TPC measurements are
provided in the documentation of the WCDMA signaling application, section "Applica-
tion Sheets". The application sheets describe an inner loop power control measure-
ment (step A to H) and a maximum power E-DCH measurement (subtest 1 to 5).
4.2.3 Parallel Signaling and Measurement
The WCDMA TPC measurement can be used in parallel to the WCDMA signaling
application (option R&S CMW-KS400). The signaling application sends TPC com-
mands to the UE and the TPC measurement evaluates the UE power and power steps.
To use both applications in parallel, the combined signal path scenario must be activa-
ted (see
"Scenario = Combined Signal Path"
on page 586). The signal routing and ana-
lyzer settings and some measurement control settings are then configured by the sig-
naling application. The TPC measurement displays the corresponding signaling set-
tings instead of its own settings. These signaling settings can be configured both in the
measurement GUI and in the GUI of the signaling application. To configure the signal-
ing settings via remote commands, the commands of the signaling application have to
General Description
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