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S:\Hp8960\E1962B CDMA 2000\Pi Release\Reference Guide\Chapters\cdma2000_meas_tdso_desc.fm
TDSO Frame Error Rate Measurement Description
TDSO Frame Error Rate Measurement Description
What is a TDSO (Test Data Service Option) FER (Frame Error Rate) measurement?
TDSO FER measurements are used to test the performance of a mobile station receiver while a supplemental
(high speed data) channel is connected and TDSO (Service Option 32) is selected.
This measurement provides a report from the mobile station indicating the status of traffic frames received
during high speed data transfer on the F-SCH (forward supplemental channel).
Since the measurement values displayed are obtained from the mobile station, there are no
multi-measurement results available, such as measurement averaging.
How is a TDSO FER Measurement Made?
The test set attempts a TDSO FER measurement when a call is connected using Service Option SO32
(+F-SCH). To establish a call with Service Option 32 you must select Radio Config (Fwd3, Rvs3) or Radio
Config (Fwd4, Rvs3) and select SO32 (+F-SCH). A mobile station originated call can be made or you can press
the Originate Call (F3) key. A TDSO FER display is shown below in Figure 6. with 512 frames selected.
Figure 6. TDSO FER Display
The time period required for TDSO FER measurements depends on the timing of the call connection.
All traffic channels, including the F-SCH, are subdivided into segments of 10.24 seconds each. Testing begins
when the first frame (called a sync frame) of the first full segment is received by the mobile station. For
example, Figure 7. shows two full F-SCH segments. In this example, the SO 32 call is connected half way
through the first segment. Approximately 5.12 s later the mobile station receives the first sync frame from the
test set and computes the PRBS data pattern the test set is about to send.
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