Uplink Configuration

NI-RFmx Waveform Creator 3.0 Help

Edition Date: January 2019

Part Number: 377064E-01

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The Uplink Configuration tab is present at the bottom of the LTE TDD modulation window. Uplink Configuration allows you to control the uplink signal that is not configured on a subframe basis.

Note: This tab is disabled when the Link Direction is set to Downlink.



Fig. 1-40 Uplink Configuration


Mode

LTE

The following Uplink Configuration options are available for a long term evolution (LTE) transmission, when Link Direction is Uplink and Mode is LTE.

RNTI

This specifies the RNTI of the Uplink portion of the signal. The range is 0 to 65535. The default value is 0.

Generation Mode

This control allows you to specify whether the Uplink portion of the frame will contain Traffic data or a PRACH signal.

If the Generation Mode is set to PRACH, all the Traffic tabs will be disabled.

If the Generation Mode is set to Traffic, the PRACH tab will be disabled.

Number of Antennas

When Uplink MIMO is configured,

  • For PUSCH, the number of codewords/layers is equal to 2 and the precoding index value equals zero. DTX for a single codeword is not supported.
  • For PUCCH, each antenna will carry the signal corresponding to its nPUCCH(1) value as per 36.213.

SRS is mapped only on the first antenna even if 2 antennas are configured. But the PUSCH/PUCCH will exclude the last SC-FDMA symbol in a subframe in both antennas.

Channel Code

Selecting this checkbox enables the channel encoding. Channel coding is disabled when the Modulation Type is set to QAM 1024.

PRACH Configuration



Fig. 1-41 PRACH Configuration


This tab contains controls for specifying how the PRACH channel will be transmitted.

Configuration Index

The valid range is 0 to 57. The default value is 0. The configuration indexes used in LTE TDD are specified in Table 5.7.1-3 of 3GPP TS 36.211 V8.9.0 (2009-12)

Cyclic Shift Configuration

The valid range is 0 to 15. The default value is 0. This corresponds to the NCS configuration specified in Table 5.7.2-2, and Table 5.7.2-3 of 3GPP TS 36.211 V8.9.0 (2009-12).

Format

This is a read-only parameter that shows the current PRACH format. The PRACH format is dependent on the PRACH configuration index.

Preamble Index

This parameter is used to configure which of the possible 64 preambles are transited on the PRACH. The default range is 0 to 63. The default value is 1.

Root Sequence Number

The default range is 0 to 837. The default value is 0. This corresponds to the logical root sequence number which is used to determine the physical root sequence numbers used in PRACH generation. See Table 5.7.2-4 and Table 5.7.2-5 of 3GPP TS 36.211 V8.9.0 (2009-12).

Mask Index

The value must be greater than 0. The default value is 0. This value is used to specify which of the possible transmission opportunities is used to transmit the PRACH.

High Speed

This field specifies whether the cyclic shifts are taken from the restricted set or the unrestricted set. When High Speed is set to True, the unrestricted set of cyclic shifts is used; otherwise the restricted set is used.

Frequency Offset

This is the frequency offset that is applied to the PRACH. It is specified in terms of resource blocks. This value must be 6 RBs less than the total system bandwidth. See Table 1-13. lists the number of resource blocks available for specific bandwidths.

Doppler Index

This is a frequency offset that is applied to the PRACH it is specified in Hz. The valid range of values is 0 to 1340 Hz.

PUSCH Configuration

This tab contains the following configuration parameters specific to the PUSCH portion of the Uplink Signal when Number of Antennas is set to 1.



Fig. 1-42 PUSCH Configuration for one antenna


When Number of Antennas is set to 2, this tab contains the following configuration parameters specific to the PUSCH portion of the Uplink Signal.



Fig. 1-43 PUSCH Configuration for two antennas


N1 DMRS

This specifies the Cell specific DMRS cyclic shift. This can take a value of {0, 2, 3, 4, 6, 8, 9, 10} the default is 0.

Delta Shift Sequence

This parameter configures the Delta Shift sequence used when performing group hopping. The valid range is 0 to 29. The default value is 0.

HARQ Offset

HARQ offset is used to determine the βoffsetHARQ-ACK parameter (Refer table of 3GPP TS 36.213 V8.8.0 (2009-09))The valid range is 0 to 14. The default value is 1.

Subframe Hopping

This parameter specifies whether the hopping is Inter Subframe or Intra and Inter Subframe.

Auto Calculate DAI

This specifies the whether the Downlink assignment index should be automatically calculated or not.

Number of Sub-bands

The valid values are 0, 1, 2, 3, or 4. The default value is 1. This specifies the number of sub-bands used in PUSCH Hopping.

Data Source

This parameter specifies the data payload of the PUSCH channel. Clicking on this control will show a standard data source configuration window and will allow you to configure the output data. The available options are All Ones, All Zeroes, PRBS, Random Bits, Repeating Pattern, or a User Data pattern file.

Hopping Offset

This is the hopping offset used in PUSCH hopping. The valid range is 0 to 98. The default value is 1.

PUCCH



Fig. 1-44 PUCCH Configuration


This tab contains configuration parameters specific to the PUCCH portion of the Uplink Signal.

N1

This parameter is used to configure the PUCCH resource used for PUCCH format 1a/1b. The valid range is 0 to calculated maximum value depending on N2 Resource Blocks, Number of Cyclic Shifts, Delta Shift, Channel Bandwidth, and Cyclic Prefix controls. The default value is 1.

Delta Shift

This can be set to 1, 2, or 3. The default value is 1.

N1SRI

This parameter is used to configure the PUCCH resource used for PUCCH format 1. The valid range is 0 to 2047. The default value is 1.

SR Configuration Index

The valid range is 0 to 154. The default value is 1.

N2

This parameter is used to configure the PUCCH resource used for PUCCH format 2/2a/2b. The valid range is 0 to 1185. The default value is 1.

N2 Resource Blocks

This parameter is used to configure the CQI resource used for PUCCH format 2/2a/2b. The valid range is 0 to 98. The default value is 1.

Number of Cyclic Shifts

The valid range is 0 to 7. the default value is 1. This defines the number of cyclic shifts used for PUCCH formats 1/1a/1b in a resource block with a mix of formats 1/1a/1b and 2/2a/2b. Valid values are 0 to 7 in integer steps.

Transmit Scheduling Request

This enables the transmission of a scheduling request to be enabled/ disabled. When the checkbox is selected, the scheduling request is transmitted; otherwise it is not.

Auto Calculate Format

When this checkbox is selected, the PUCCH format is automatically calculated. When the checkbox is unselected, the PUCCH format has to be specified for every subframe that carries PUCCH information.

Simultaneous Ack, Nack, and SRS

This checkbox is used to enable the simultaneous transmission of ACK/NACK on the PUCCH channel.

DMRS Configuration



Fig. 1-45 DMRS Configuration


This tab contains configuration parameters specific to the DMRS portion of the Uplink Signal.

Group Hopping

This checkbox enables/disables DMRS group hopping.

Sequence Hopping

This checkbox enables/disables DMRS sequence hopping.

SRS Configuration



Fig. 1-46 SRS Configuration


This tab contains configuration parameters specific to the SRS portion of the Uplink Signal.

State

This enables/disables the transmission of the SRS signal. When the state is disabled the SRS signal will not be transmitted in any subframes.

Cell Specific B/W Configuration

This parameter is used to set the Cell Specific B/W parameter CSRS which is used to map the SRS onto physical resources. This parameter can take any value from 0 to 7.

Subframe Configuration

This parameter configures the SRS subframe configuration specified in Table 5.5.3.3-2 of 3GPP TS 36.211 V8.9.0 (2009-12). This can be set to any value from 0 to 13

U/E Specific B/W

This parameter is used to set the Cell Specific B/W parameter BSRS. which is used to map the SRS onto physical resources. This parameter can take any value from 0 to 3.

Configuration Index

This sets the SRS configuration index ISRS which is used to determine SRS periodicity and SRS subframe offset. For LTE TDD, the SRS periodicity and SRS subframe offset are determined using Table 8.2-2 of 3GPP TS 36.213 V8.8.0 (2009-09). The SRS configuration index can take any value from 0 to 13.

Frequency Domain Position

This parameter is used to configure the frequency domain position value nRRC. This is used in mapping the SRS onto physical resources. This parameter must be in the range 0 to 23.

Cyclic Shift

This sets the SRS cyclic shift parameter nSRSCS that is used to generate the SRS sequence. This parameter must be in the range 0 to 7.

Hopping Bandwidth

This set the hopping bandwidth parameter bhop. This parameter can take any value from 0 to 3.

Transmission Comb

This control sets the transmission comb parameter kTC which is used in mapping the SRS onto physical resources. You can set the transmission comb parameter to a value of 1 or 0.

Power

This parameter sets the relative SRS power. The valid range is -1000 to 30 dB.

Max UpPTS Enabled

This is used for configuring the use of the SRS in special subframes.

Subframe1 N_RA

Specifies the number of Number of Format 4 PRACH resources allocated on the special subframe(subframe number 1).

Refer to section 5.5.3.2 of the 3GPP TS 36.211 v8.8.0 specifications for more information on this property.

The default value is 0. Valid values are 0 to 6, inclusive.

Subframe6 N_RA

Specifies the number of Number of Format 4 PRACH resources allocated on the special subframe(subframe number 6).

Refer to section 5.5.3.2 of the 3GPP TS 36.211 v8.8.0 specifications, for more information on this property.

The default value is 0. Valid values are 0 to 6, inclusive.

HARQ Configuration



Fig. 1-47 HARQ Configuration


Codeword 1 Ack/Nack Pattern

This allows you to specify the pattern of Ack/Nack bits used within the HARQ codeword 1. To use this control press 1 for on, 0 for off, or D for DTX.

Codeword 2 Ack/Nack Pattern

This allows you to specify the pattern of Ack/Nack bits used within the HARQ codeword 2. To use this control press 1 for on, 0 for off, or D for DTX.

Feedback Mode

This sets the HARQ feedback mode. The feedback mode can be set to multiplexing or bundling. In LTE TDD the number of Uplink subframes is not always equal to the number of downlink subframes. HARQ multiplexing and HARQ bundling are two methods that are employed to enable the ACK/NACKs transmitted on PUCCH to acknowledge transmissions form multiple downlink subframes.

Multicarrier Harq Operation

Whenever this checkbox is enabled, the PUCCH considers tables 10.1.3-5, 10.1.3-6, and 10.1.3-7 otherwise considers tables 10.1.3-2, 10.1.3.-3, and 10.1.3-4 as defined in document 3GPP TS 36213, V12.5.0.

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