2201R Mobile Tester User Guide
Chapter 3 Performing manual tests and measurements in GSM mode
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Performing receiver measurements in the mobile phone
The receiver of the mobile phone includes different components to measure the received signal strength and to
demodulate the signal. It also decodes the received bit stream and, based on the relative number of bit errors found
in the decoding process, provides an estimate of the signal quality.
Once a traffic channel has been set up (see instructions on either page 53 or page 55), the results of the receiver
measurements can be viewed in the GSM Tests menu and also in the GSM BER Test menu (accessible from the GSM
Tests menu by pushing the BER Meas. soft key). They are as follows.
RX Level
This is the received power level estimated by the mobile phone, in dBm. The phone can report its input power level
back to the base station (or tester) in the range from –110 dBm to –48 dBm, in 1 dB steps. It should be as close as
possible to the RF output power, provided that the coupling factor has been selected correctly.
RX Quality
Based on the number of bits corrected by its own channel decoder, the mobile estimates the BER. The result is
reported to the base station (or tester) as a numerical value in the range from 0 to 7. The lower the value, the better
the reception quality. The exact meaning of the RX quality value is given in the table below.
Table 11 Coding of RX Quality
RX Quality value Estimated BER
0< 0.2%
1 0.2 to 0.4%
2 0.4 to 0.8%
3 0.8 to 1.6%
4 1.6 to 3.2%
5 3.2 to 6.4%
6 6.4 to 12.8%
7 > 12.8%
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