2201R Mobile Tester User Guide
Chapter 3 Performing manual tests and measurements in GSM mode
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10. From the Slots selection field, select the number of time slots per frame that you want to test. The 2201R allows
you to select only as many time slots per frame as the mobile phone is capable of transmitting.
11. In the RF Output Power entry field, select the power level at which you want to perform the receiver
measurement.
12. Push the Start Test soft key.
The measurements are started, and the menu is frequently updated with results.
’Interpreting the results’ on page78 explains how the results should be read.
13. When you are finished, push the Stop Test soft key.
The measurements stop, and the status indication returns to GPRS Attached.
Interpreting the results
GPRS Tests menu produces a statistical evaluation of the results of the BLER-BCS for each time slot and in addition
over all the time slots measured. The BLER-BCS is measured as a percentage.
The BLER-USF measurement is typically performed at an RF output power level of –104 dBm. The result must not
exceed 2% according to the GPRS specifications.
The results representation on the right-hand side includes a graphical Pass/Fail statement. This verdict depends on
the limits defined in the GSM/GPRS Limits menu. (The limit value for BLER-BCS refers to the upper limit because the
lower limit is 0% by nature.)
Measuring the TX measurements in GPRS
TX measurements are captured during the GPRS attach state. Measurements fetched are: TX Power, Freq. Error, EVM
Peak, EVM RMS, Phase Err. Peak, Phase Err. RMS and Burst Length.
Note
The BLER is calculated over all time slots selected. Each measurement result is generated from a
user-defined number of samples. A sample in case of the BLER-BCS measurement is a block, which in
the worst case of one time slot assigned in the downlink, takes 20 ms. So if you select 200 samples, a
measurement result is returned every four seconds.
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