WCDMA Signaling
R&S
®
CMW-KG4xx/-KM4xx/-KS4xx
150
User Manual 1173.9657.02 ─ 11
If the dual carrier scenario is active, the information is displayed per carrier. Addition-
ally the sum of both powers is displayed.
Remote command:
RF Power Uplink > ...
These parameters configure the expected UL power. The displayed reference level is
calculated as the sum of expected nominal power and margin.
Two modes are available:
●
Manual
In manual mode the expected nominal power and a margin can be defined man-
ually.
An appropriate expected nominal power value for WCDMA signals is the peak out-
put power at the DUT during the measurement interval.
The margin is used to account for the known variations (crest factor) of the RF
input signal power. Appropriate values depend on the configuration of the
UL WCDMA signal, e.g. on the active channels and gain factors. For a 12.2 kbps
Reference Measurement Channel (RMC), a value of 5 dB is appropriate.
●
According to UL Power Control Settings
While a downlink signal is available, the expected nominal power and the margin
are calculated automatically from the UL power control settings and displayed for
information.
As long as no call or connection has been set up, the expected power corresponds
to the expected initial preamble power, see
on page 170 and a high margin is used.
During a call/connection, the values depend e.g. on the TPC settings, the power
class of the UE, the maximum power allowed in the cell and the beta factors.
The automatic mode is not recommended for the "Phase Disc..." and "Single Pat-
tern Alt." TPC setups. Use the manual mode instead.
For all other TPC setups the automatic mode can be used. For the TPC test steps
E to H the values are optimized several times per test step. These changes are
performed too fast to display all of them at the GUI.
When performing spectrum measurements with a "Closed Loop" or "All 1" TPC
setup, consider to use the manual mode in order to optimize the dynamic range.
Note that the actual input power at the connectors (i.e. the "Reference Level" minus
the "External Attenuation (Input)" value, if all power settings are configured correctly)
must be within the level range of the selected RF input connector; refer to the data
sheet.
Remote command:
GUI Reference
深圳德标仪器
