Change of TFC (Transport Format Combination) Troubleshooting
Last updated: January 16, 2009
This section is only applicable to the lab application.
Possible Setup Issues
-
Before performing the change of TFC measurement, you must ensure the following:
-
The following settings are recommended based on the 3GPP TS 34.121 5.6 requirements:
-
During front panel operation of this measurement, you must press the
START SINGLE
key to initiate the measurement.
-
The change of TFC measurement is triggered when the TFCI indicates no data is present on the DPDCH. If the UE does not properly set the TFCI bit to indicate when data is present on the DPDCH, the measurement will hang. To prevent the measurement from hanging indefinitely, set the
Measurement Timeout
. You can reset the measurement, if needed, by pressing the
MEASUREMENT RESET
key.
-
This measurement does not provide valid results while on a faded channel (see
Digital Bus Information
).
Other Considerations
-
No other measurements can run while a change of TFC measurement is being performed. If any measurements are running when a change of TFC measurement is initiated, they are closed and a message is displayed to indicate that they were closed. Likewise, if any other measurements are initiated while a change of TFC measurement is running, the change of TFC measurement is closed and a message is displayed.
-
Ensure that the UE is meeting the
Change of TFC Measurement Input Signal Requirements
.
-
The change of TFC measurement must be properly calibrated (see
Change of TFC Measurement Calibration
)
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