Technical data

Chapter 11 155
Example Test Scenarios
Verification Example
Example Test Scenarios
Verification Example
In this example, we run a verification test known as ILPC (for inter-loop power control) on a WCDMA
mobile device.
The test set supplies a 2140 MHz downlink signal to the DUT, and measures a 1950 MHz uplink signal
returned by the DUT. The test set uses the same input/output port (RFIO 1) to provide the downlink
signal and measure the uplink signal.
ILPC verification requires that the downlink signal be modulated with certain kinds of data which the
mobile device would expect to receive from a base station. The test set cannot fully simulate a base
station, but in this test the signal from the test set includes the minimum channels (for synchronization
and power control of the device) that the ILPC test requires. This is made possible by including those
channels in an ARB waveform file, downloading the file to the test set, and using the file to modulate the
test set’s RF output.
During the ILPC test, the DUT receives (in the downlink signal) inputs which should cause it to increase
or decrease the RF power level of the uplink signal. The test set then measures the uplink signal
transmitted by the DUT, to confirm that the expected power changes were made.
Figure 11-7. Hardware setup for verification example