Real Time

UL-SCH Tx sequence Window (Advanced LTE FDD Uplink)

Select a UL-SCH channel in the Channel Setup node, then click the button in the Transmission Configuration cell to open the UL-SCH Tx sequence window.  

The UL-SCH TX window displays the transmission sequence defined in the Channel Setup node for the selected UL-SCH channel.

You can make adjustments to the MCS index, VRB offset for slot 0 and slot 1, and other parameters for each UL-SCH transmission from within the UL-SCH Tx sequence window.

Click the Column Preset button to access a drop-down list that enables you to set parameters for all transmissions to the same value.

The settings configured in the Channel Setup node and the UL-SCH Tx sequence window are displayed in the Tx Map.

Use the Import tab to navigate to and import a saved transmission sequence.

Use the Export tab to save the current transmission sequence to a file.

UL-SCH Tx sequence window (left half)

UL-SCH Tx sequence window (right half)

Parameter Descriptions

RB Offset 

Range: 0 to RBmax -1

Default: 0

Enter the number of resource blocks by which to offset the UL-SCH transmission in slot 0.

RB Size

Range: 1 to 25

Default: 25

Enter a value for the RB Size.

Retrans

Click to select the retransmission of the ACK/NACK data from the previous data sequence subframe, 8 subframes earlier.

Example:  If the eNB receives incorrect data in uplink process #0, it sends a sends a retransmission request (NACK) to the UE. The UE then resends the data that was sent in previous process #0, 8 subframes earlier, starting with the next cycle of process #0. This is done by incrementing the RV Index in the specified sequence (i.e. 0, 2, 3, 1...), up to the maximum number of the retransmission (i.e. a longer Waveform Generation Length, enables a greater number of potential retransmissions). Each complete retransmission can only happen after eight subframes.

Refer to the 3GPP standards, TS36.213 clause 8 and TS36.321 clause 5.4.2 on HARQ operation.

MCS Index

Range: 0 to 31 | Off

Default: 0

Sets the value of the Modulation and Coding Scheme (MCS) Index value.

When an MCS Index value is selected, the software generates the values for Modulation, TBS Index, and the TB Size according to the 3GPP standards. You can choose to manually enter the TB Size and the modulation, by turning off the MCS Index and the TBS Index parameters. This is required where the control information is transmitted without any data (payload)

Modulation

Choice: QPSK | 16QAM | 64QAM

Default: QPSK

Use the drop-down menu to select the modulation type.

TBS Index

Choices: 0 to 26 | Off

Default: 0

Sets the value of the Transport Block (TB) Index.

When an MCS Index value is selected, the software generates the values for Modulation, TBS Index, and the TB Size according to the 3GPP standards. You can choose to manually enter the TB Size and the modulation, by turning off the MCS Index and the TBS Index parameters. This is required where the control information is transmitted without any data (payload)

TBS Size

Sets the value of the Transport Block (TB) Size.

When an MCS Index value is selected, the software generates the values for Modulation, TBS Index, and the TB Size according to the 3GPP standards. You can choose to manually enter the TB Size and the modulation, by turning off the MCS Index and the TBS Index parameters. This is required where the control information is transmitted without any data (payload)

RV Index 

Range: 0 to 3

Default: 0

Enter a value for the RV(Redundancy Version) index.

Hopping Flag

Enables or disables the Hopping Flag.

Hopping Type

Choices: Type1 +1/4 | Type1 -1/4 | Type1 +1/2 | Type2,

Select a value for the Hopping Type.

DMRS Power

Range: -60.0 to 20.0 dB

Default: 0 dB

Enter a power level in dB for the UL-SCH.

nDMRS(2)

Range: 0 to (Max resource element -1)

Default: 0

This value is used to calculate the Cyclic Shift Alpha (see 3GPP TS36.211).

HARQ-ACK

Choice: On | Off

Default: Off

Select the check box to turn HARQ-ACK on. Clear the check box to turn HARQ-ACK off.

HARQ-ACK Info

Choice: ACK | NACK | ACK-ACK | ACK-NACK | NACK-ACK | NACK-NACK | User Defined Bits

Default: ACK

Click in the cell to open the HARQ-ACK Info Selection dialog box and select the HARQ-ACK information type.

HARQ-ACK Info Size

Range:

1 for HARQ-ACK Info = ACK or NACK

2 for HARQ-ACK Info = ACK-ACK, ACK-NACK, NACK-ACK, NACK-NACK

3 to 11 for HARQ-ACK Info = User Defined Bits

If User Defined Bits is selected as the HARQ-ACK Info type, enter a value between 3 and 11 for HARQ-ACK Info Size. The software sets the HARQ-ACK Info Size for the other HARQ-ACK Info type selections as shown above.

RI

Choice: On | Off

Default: Off

Select the check box to enable RI multiplexing to the UL-SCH in a specific subframe.

RI Info

Choice: 0 | 1 | 0-0 | 0-1 | 1-0 | 1-1 | User Defined Bits

Default: 0

Click in the cell to open the RI Info Selection dialog box. Select one of the choices to set the RI Info type.

The range for input data for User Defined Bits is 1 to 10 bits.

RI Info Size

Range:

1 for RI Info = 0 or 1

2 for RI Info = 0-0, 0-1, 1-0, or 1-1

1 to 10 for RI Info = User Defined Bits

If User Defined Bits is selected as the RI Info type, enter a value between 1 and 10 for RI Info Size. The software sets the RI Info Size for the other RI Info type selections as shown above.

CQI/PMI

Choice: On | Off

Default: Off

Select the check box to enable CQI/PMI multiplexing to the UL-SCH in a specific subframe.

CQI/PMI Info

Choice: PN9 | PN15 | User Defined Bits

Default: PN9

Click in the cell to open the CQI/PMI Info Selection dialog box. Select one of the choices to set the CQI/PMI Info type.

CQI/PMI Info Size

Range: 1 to 20

Default: 4

Enter a value for CQI/PMI Info Size.

Examples

Default Settings

The UL-SCH Tx sequence window displays the UL-SCH channel configured in the Channel Setup node.

Figure 1 shows the UL-SCH Tx sequence window with the following default parameters defined in the Channel Setup node:

Number of HARQ Processes = 8 (ttiBundling = OFF)

8 HARQ processes are available for use, and the interval between retransmissions is 8 subframes. Transmission Time Interval Bundling is off.

Assigned Processes = 0-7  

HARQ processes 0 through 7 are enabled.

Figure 1. UL-SCH Tx sequence with Default Configuration

One Retransmission Enabled

Figure 2 shows the UL-SCH Tx sequence window with the following parameters defined in the Channel Setup node:

Assigned Processes = 0  

Only HARQ process 0 is enabled.

Figure 2. UL-SCH Tx sequence with One Retransmission

Two HARQ Processes Enabled

Figure 3 shows the UL-SCH Tx sequence window with the following parameters defined in the Channel Setup node:

Number of HARQ Processes = 8 (ttiBundling = OFF) 

8 HARQ processes are available for use, and the interval between retransmissions is 8 subframes. Transmission Time Interval Bundling is off.Assigned Processes = 0,2

Assigned Processes = 0,2

In Figure 3, HARQ processes 0 and 2 are enabled.

Figure 3. UL-SCH Tx sequence with Two Assigned HARQ Processes and one retransmission