The High Speed Downlink Shared Channel is the downlink data channel shared by several UEs using a fixed spreading factor (16), CRC (24 bit), 1/3 turbo coding, and 5 ms TTI.
Choice: On, Off
Default: On
Set the state of the selected channel to either on
or off. Double-click the cell to change the state or use 
icon at the right of the cell to make your selection.
If the status bar displays an error message, ensure that the switching
point in the Waveform Setup is set at 1.
Range: –60 dB to 0 dB
Enter a value to set the power of the channel relative to the other channels in the carrier. See Power Setting for details.
The Timing Offset property is only valid for uplink timeslots. For downlink timeslots, it is read-only.
Range: 1 to 16
Enter a value to identify the user on the channel. The UE ID in HS-DSCH is used to set the user's midamble shift in all Resource Units. As the UE ID changed, the User ID in all of the RUs will be set to the same value of UE ID in HS-DSCH. Meanwhile, each midamble shift of the RU can be set separately.
Selections: QPSK, 16QAM
Select the modulation type for the channel. Double-click
the cell to change the modulation type or use
icon at the right of the cell to make your selection.
Displays the spreading factor of the channel. You cannot edit the value in this cell.
Range: 1 to 6
Click the
icon at the right of the cell to access the 
HS-DSCH Resource Dialog window
where you can select the timeslot allocation for the HS-DSCH channel.
Range: depends on UE category and timeslots
Enter a value to set the number of codes to be used for each timeslot. The number of codes per slot and the code offset determine the code used by the HS-DSCH and are coded into the data of the HS-SCCH. The RU allocation will change depending on the timeslot number times the code number per slot.
Range: Start Code + Code Number < 16
Enter a value to set the code offset. The number of codes per slot and the code offset determine the code used by the HS-DSCH. The allocated resource units as assigned by timeslot and number of codes will each be offset by this number.
View the total number of resource units allocated for this channel.
Click the icon at the right
of the cell to access the inter
TTI Data Type Entry window to set the pattern between
HS-DSCH data sending. An inter-TTI interval of 1 indicates
that data will be transmitted to the UE in every TTI,
2 in every other TTI, and so on.
Selections: STD, PN9, PN15, 0, 1 text file
Default: STD
Click the cell and the down-arrow
at the far right of the cell to access the data
menu..
|
STD |
select data as defined in the standard |
|
PN9 |
select random sequence numbers |
|
PN15 |
select random sequence numbers |
|
0, 1 text file |
select this to load a user-defined 0, 1 text file as the data source. When this is selected as the data type, two new cells are added to the cell format.
|
Displays the current settings for the HS-DSCH data.
Expand 
the cell to modify any editable parameter
settings.
Selections: PN9, PN15, 0, 1 text file
Default: PN9
Click the cell and the
down-arrow at the far right of
the cell to display the selections for the data type for the channel.
|
PN9 |
select random sequence numbers |
|
PN15 |
select random sequence numbers |
|
0, 1 text file |
select this to load a user-defined 0, 1 text file as the data source. When this is selected as the data type, two new cells are added to the cell format.
|
Enter a value of the block size.
View the number of blocks, fixed at 1.
View the number of bits in the CRC, fixed at 24.
Range: 2788----168960
Use this cell to set the size of the incremental redundancy buffer.
View the coding type for the channel which is fixed at 1/3 turbo coding.
View the first puncture ratio. It is automatically set depending on the block size and the incremental redundancy buffer size.
View the time for each TTI transmission, fixed at 5 ms.
View the second puncture ratio. It is automatically set depending on the block size and the incremental redundancy buffer size.
View the radio frame segment output for the coded data. This will vary depending on the allocated RUs.
View the maximum data rate of the HS-DSCH channel. The data rate will vary with the block size. The default value is 526.600 kbps.
Displays a summary of
the HARQ parameters as set in the cells below. Expand
the cell to modify any editable parameter settings.
Selections: None, ARQ
Select the ARQ type. You can double-click
the cell to change the ARQ type or use
icon at the right of the cell to make your selection.
|
None |
Sets the redundancy factor to 0. No ACK/NACK data is needed for the receiver. |
|
ARQ |
Allows data to be resent as set by the RV factor. |
Range: 1 to 8
Specify an arbitrary number of HARQ transmissions. When the software encounters a UE NACK response, the software resends the coded packet payload until either the maximum number of HARQ transmissions is reached or a simulated ACK response is encountered.
Range: 0 to 7 for each ARQ process
Use this cell to set the redundancy version number for ARQ transmission. It sets the feedback cycle of the HS-DSCH (number of TTIs) when a NACK response is received. If all RV factors are the same, each retransmission sends the same punctured coded data. When different RV factors are set, the retransmission data uses different punctured coded data until either an ACK is received or the maximum ARQ process number is reached.
The Resource Unit Setup table enables you to configure the resource unit for each channel.
at the far right of the User File cell. An
Open window is displayed for navigating to and selecting the desired ASCII
file (*.txt). The Data Length cell is updated with
the corresponding length.