Rohde & Schwarz 1094.0006.50, Operating Manual

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CTS-K6 Windows

Application CTSgo
1079.2001.01 47 E-3
Note:
The choice of networks depends on the options available in your CTS!
It is advisable to configure the network first and then make test configurations.
7.3.2 Test Parameters
The Test Parameters command opens the dialog window shown below. This window permits to set the
BCCH of the base station, the path attenuation between mobile and CTS, the number of frames used
for the bit-error-rate measurement and the number of bursts for the phase and frequency-error
measurement.
The input of correct attenuation values has a decisive influence on the measurement accuracy. In the
ideal case, an antenna cable should be used, which is directly connected to the mobile, eg as found in
the car kit of the mobile. An attenuation between 0.5 and 2 dB is normally obtained in this case.
Problems will however arise when using antenna couplers. The attenuation of the mobile types may
differ considerably, and it may vary depending on the frequency channel used. If you do not know the
attenuation of your antenna coupler proceed as described below:
•
Establish a connection to your mobile in the manual mode of CTS.
•
Set a power of eg –70 dBm for the traffic channel TCH.
•
Measure RXLev. This is the power the mobile receives, which is signaled to the base station at
regular intervals in so-called measurement reports.
•
Compare the measured RXLev with the TCH power of the CTS.
•
Select an average power control level (PCL) on the CTS.
•
Compare the measured output power of the mobile with the rated value of the selected PCL.
The input of the attenuation values happens independently for each band. The attenation values for
each band are separated for low, mid and high channels.
Bear in mind that, in addition to the measurement inaccuracy of the tester, the production tolerance of
the mobile has to be taken into account to estimate the total error. This method requires the mobile to
be fully operational.
The BER measurement is the only way to determine the receiving quality and particularly the sensitivity
of the mobile. The measurement itself is a statistical evaluation of the sent bits and the errored bits.
Fig.: Configure Test Parameters dialog window