
Chapter 15 411
W-CDMA Uplink Digital Modulation for Receiver Test
DPCH
9. Press Return.
A third transport channel has been turned on and configured to use 1/3 convolutional
encoding with a rate match attribute of 256. Changing channel parameters can affect your
puncture rate, and they may also affect the parameters for other active channels. Whenever
parameters are changed in one channel, check the other channels to ensure their parameters
are still within acceptable limits. Notice that decreasing the block size for transport channel
two lowered the data rate which in turn decreased the amount of data that would be
punctured. Puncturing can also be reduced by increasing the DPDCH symbol rate.
Setting Up the Compressed Mode
The compressed mode is very flexible with many adjustable parameters. You can have one or
two transmission gaps. When two gaps are used, each gap can have a different length and
operate using the single or double frame method. Table 15-3 describes the parameters that
are available for the compressed mode. The compressed mode frames are fully coded which
enables you to perform BER and BLER testing of the receiver.
The tasks in this procedure build upon the previous procedure, “Modifying the
DPCCH/DPDCH Physical and Transport Layers” on page 407, which modified the symbol
rate of the physical layer since it was too high for use with compressed mode.
Using the compressed mode can turn the ESG ALC feature off. For reliable results, you may
need to perform a power search. Before completing this procedure, refer to “Special Power
Control Considerations When Using DPCCH/DPDCH in Compressed Mode or PRACH” on
page 453.
Table 15-3 Uplink Compressed Mode Parameters
Name Definition
Transmission gap pattern repetition count
(TGPRC)
Number of transmission gap patterns
within the transmission gap pattern
sequence.
Transmission gap connection frame number
(TGCFN)
CFN of the first radio frame of the first
pattern within the transmission gap
pattern sequence.
Transmission gap slot number
(TGSN)
Slot number of the first transmission gap
slot within the first radio frame of the
transmission gap pattern.
Transmission gap length 1
(TGL1)
Duration of the first transmission gap
within the transmission gap pattern.
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