nrPUSCHConfig

PUSCH configuration parameters

Since R2020a

Description

The nrPUSCHConfig object sets physical uplink shared channel (PUSCH) configuration parameters, as defined in TS 38.211 Sections 6.3.1, 6.4.1.1, and 6.4.1.2 [1].This object bundles all the properties involved in the PUSCH processing chain, including scrambling, symbol modulation, layer mapping, transform precoding, MIMO precoding, and resource element mapping. The object also contains properties to determine the number of resources for the uplink control information (UCI) multiplexing and associated physical reference signals, such as demodulation reference signal (DM-RS) and phase tracking reference signal (PT-RS).

The default nrPUSCHConfig object configures a single-layer PUSCH with cyclic-prefix orthogonal frequency division multiplexing (CP-OFDM), mapping type A, QPSK modulation, a resource allocation of 52 resource blocks and 14 OFDM symbols in a slot, and single-symbol DM-RS type 1. This configuration corresponds to a full resource allocation with respect to the default nrCarrierConfig object.

Creation

Syntax

pusch = nrPUSCHConfig

pusch = nrPUSCHConfig(Name,Value)

Description

pusch = nrPUSCHConfig creates a PUSCH configuration object with default properties.

pusch = nrPUSCHConfig(Name,Value) specifies properties using one or more name-value pair arguments. Enclose each property in quotes. For example, 'NSizeBWP',200,'NumLayers',4 specifies 200 physical resource blocks (PRB) in the bandwidth part (BWP) and 4 transmission layers. Unspecified properties take their default values.

Properties

Channel Configuration

NSizeBWP — Number of PRBs in BWP

[] (default) | integer from 1 to 275

Number of PRBs in bandwidth part (BWP), specified as an integer from 1 to 275. Use [] to set this property to the NSizeGrid property of the nrCarrierConfig object.

Data Types: double

NStartBWP — Starting PRB index of BWP relative to CRB 0

[] (default) | integer from 0 to 2473

Starting PRB index of BWP relative to common resource block 0 (CRB 0), specified as an integer from 0 to 2473. Use [] to set this property to the NStartGrid property of the nrCarrierConfig object.

Data Types: double

Modulation — Modulation scheme

'QPSK' (default) | 'pi/2-BPSK' | '16QAM' | '64QAM' | '256QAM' | string scalar

Modulation scheme, specified as 'QPSK', 'pi/2-BPSK', '16QAM', '64QAM', or '256QAM', a string scalar, or a character array.

Modulation Scheme	Number of Bits Per Symbol
'pi/2-BPSK'	1
'QPSK'	2
'16QAM'	4
'64QAM'	6
'256QAM'	8

Data Types: char | string

NumLayers — Number of transmission layers

1 (default) | 2 | 3 | 4

Number of transmission layers, specified as 1, 2, 3, or 4.

Data Types: double

MappingType — Mapping type

'A' (default) | 'B'

Mapping type of the physical shared channel, specified as 'A' or 'B'.

Data Types: char | string

SymbolAllocation — OFDM symbol allocation

[0 14] (default) | two-element vector of nonnegative integers

OFDM symbol allocation of the physical shared channel, specified as a two-element vector of nonnegative integers. The first element of this property represents the start of symbol allocation (0-based). The second element represents the number of allocated OFDM symbols.

When you set this property to [] or the second element of the vector to 0, no symbol is allocated for the channel.

Data Types: double

PRBSet — PRB allocation

[0:51] (default) | vector of integers from 0 to 274

Physical resource block (PRB) allocation of the PUSCH within the BWP, specified as a vector of integers from 0 to 274.

Data Types: double

TransformPrecoding — Transform precoding

0 or false (default) | 1 or true

Transform precoding, specified as one of these values.

• 0 (false) — Disable transform precoding. The waveform type is cyclic-prefix orthogonal frequency division multiplexing (CP-OFDM).

• 1 (true) — Enable transform precoding. The waveform type is discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-s-OFDM).

Data Types: double | logical

TransmissionScheme — PUSCH transmission scheme

'nonCodebook' (default) | 'codebook'

PUSCH transmission scheme, specified as 'nonCodebook' or 'codebook'.

Data Types: char | string

NumAntennaPorts — Number of antenna ports

1 (default) | 2 | 4

Number of antenna ports, specified as 1, 2, or 4. This value must be greater than or equal to the NumLayers property.

Dependencies

This property is applicable only when TransmissionScheme is set to 'codebook'.

Data Types: double

TPMI — Transmitted precoding matrix indicator

0 (default) | integer from 0 to 27

Transmitted precoding matrix indicator, specified as an integer from 0 to 27.

Dependencies

To enable this property, set the TransmissionScheme property to 'codebook'.

Data Types: double

FrequencyHopping — Frequency hopping

'neither' (default) | 'intraSlot' | 'interSlot'

Frequency hopping for the physical uplink shared channel, specified as 'neither', 'intraSlot', or 'interSlot'.

Data Types: char | string

SecondHopStartPRB — Starting PRB index of second hop

1 (default) | integer from 0 to 274

Starting PRB index of the second hop relative to the BWP, specified as an integer from 0 to 274.

Dependencies

This property is applicable only when FrequencyHopping is set to 'intraSlot', or 'interSlot'.

Data Types: double

NID — PUSCH scrambling identity

[] (default) | integer from 0 to 1023

PUSCH scrambling identity, specified as [] or an integer from 0 to 1023.

• If the higher layer parameter dataScramblingIdentityPUSCH is configured, NID must be an integer from 0 to 1023.

• If the higher layer parameter dataScramblingIdentityPUSCH is not configured, NID must be an integer from 0 to 1007.

When you specify this property as [], the object sets the PUSCH scrambling identity to the physical layer cell identity, specified by the NCellID property of the carrier.

Data Types: double

RNTI — Radio network temporary identifier

1 (default) | integer from 0 to 65,535

Radio network temporary identifier of the user equipment (UE), specified as an integer from 0 to 65,535.

Data Types: double

NRAPID — Random access preamble index

[] (default) | integer from 0 to 63

Random access preamble index, specified as one of these values.

• [] — Use this value to specify that the scrambling initialization does not consider msgA on PUSCH.

• Integer from 0 to 63 — Use this value to initialize the scrambling sequence for msgA on PUSCH, as defined in Release 16 of TS 38.211 Section 6.3.1.1.

Data Types: double

UCI on PUSCH Configuration

BetaOffsetACK — Beta offset factor of HARQ-ACK

20 (default) | positive real-valued scalar

Beta offset factor of the HARQ-ACK, specified as a positive real-valued scalar. This property determines the number of resources for multiplexing HARQ-ACK. The nominal value is one of the entry from the Table 9.3-1 of TS 38.213.

Data Types: double

BetaOffsetCSI1 — Beta offset factor of CSI part 1

6.25 (default) | positive real-valued scalar

Beta offset factor of the channel state information (CSI) part 1, specified as a positive real-valued scalar. This property determines the number of resources for multiplexing CSI part 1. The nominal value is one of the entry from the Table 9.3-2 of TS 38.213.

Data Types: double

BetaOffsetCSI2 — Beta offset factor of CSI part 2

6.25 (default) | positive real-valued scalar

Beta offset factor of the CSI part 2, specified as a positive real-valued scalar. This property determines the number of resources for multiplexing CSI part 2. The nominal value is one of the entry from the Table 9.3-2 of TS 38.213.

Data Types: double

UCIScaling — Scaling factor

1 (default) | scalar between 0 and 1

Scaling factor to limit the number of the resource elements allocated for the UCI on the PUSCH, specified as a scalar between 0 and 1. The nominal value is 0.5, 0.65, 0.8, or 1.

Data Types: double

Reference Signals Configuration

DMRS — PUSCH DM-RS configuration parameters

default nrPUSCHDMRSConfig object (default) | nrPUSCHDMRSConfig object

PUSCH DM-RS configuration parameters, specified as an nrPUSCHDMRSConfig configuration object.

EnablePTRS — Enable PT-RS

0 or false (default) | 1 or true

Enable the PT-RS, specified as one of these values.

• 0 (false) — Disable the PT-RS configuration.

• 1 (true) — Enable the PT-RS configuration.

Data Types: double | logical

PTRS — PUSCH PT-RS configuration parameters

default nrPUSCHPTRSConfig object (default) | nrPUSCHPTRSConfig object

PUSCH phase tracking reference signal (PT-RS) configuration, specified as an nrPUSCHPTRSConfig configuration object.

Examples

Create PUSCH Configuration Object

Create a physical uplink shared channel configuration object with 'codebook' transmission scheme.

Specify the size of the bandwidth part as 52, scrambling identity as 750, frequency hopping as 'interslot', and number of antenna ports as 2. Enable transform precoding and PT-RS configuration.

pusch = nrPUSCHConfig;
pusch.NSizeBWP = 52;
pusch.NID = 750;
pusch.TransmissionScheme = 'codebook';
pusch.FrequencyHopping = 'interslot';
pusch.NumAntennaPorts = 2;
pusch.TransformPrecoding = 1;
pusch.EnablePTRS = 1;
disp(pusch)

  nrPUSCHConfig with properties:

              NSizeBWP: 52
             NStartBWP: []
            Modulation: 'QPSK'
             NumLayers: 1
           MappingType: 'A'
      SymbolAllocation: [0 14]
                PRBSet: [0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51]
    TransformPrecoding: 1
    TransmissionScheme: 'codebook'
       NumAntennaPorts: 2
                  TPMI: 0
      FrequencyHopping: 'interSlot'
     SecondHopStartPRB: 1
         BetaOffsetACK: 20
        BetaOffsetCSI1: 6.2500
        BetaOffsetCSI2: 6.2500
            UCIScaling: 1
                   NID: 750
                  RNTI: 1
                NRAPID: []
                  DMRS: [1x1 nrPUSCHDMRSConfig]
            EnablePTRS: 1
                  PTRS: [1x1 nrPUSCHPTRSConfig]

Generate PUSCH Indices and PT-RS Indices for Codebook-Based Transmission

Create a carrier configuration object with default properties. This object corresponds to a 10 MHz carrier with 15 kHz subcarrier spacing.

carrier = nrCarrierConfig;

Create a PUSCH configuration object with codebook-based transmission. Set the number of antenna ports to 4, modulation scheme to pi/2-BPSK, transmitted precoding matrix indicator to 10, and transform precoding to 0. When transform precoding is 0, the waveform type is cyclic-prefix orthogonal frequency division multiplexing (CP-OFDM). Enable phase tracking reference signal (PT-RS).

pusch = nrPUSCHConfig;
pusch.TransformPrecoding = 0;
pusch.Modulation = 'pi/2-BPSK';
pusch.TransmissionScheme = 'codebook';
pusch.NumAntennaPorts = 4;
pusch.TPMI = 10;
pusch.EnablePTRS = 1;

Generate PUSCH indices and PT-RS indices in subscript form.

[ind,info,ptrsInd] = nrPUSCHIndices(carrier,pusch,'IndexStyle','subscript')

ind = 31096x3 uint32 matrix

    1    1    1
    2    1    1
    3    1    1
    4    1    1
    5    1    1
    6    1    1
    7    1    1
    8    1    1
    9    1    1
   10    1    1
      ⋮

info = struct with fields:
                G: 7774
               Gd: 7774
        NREPerPRB: 156
    DMRSSymbolSet: 2
    PTRSSymbolSet: [0 1 3 4 5 6 7 8 9 10 11 12 13]

ptrsInd = 1352x3 uint32 matrix

    13     1     1
    37     1     1
    61     1     1
    85     1     1
   109     1     1
   133     1     1
   157     1     1
   181     1     1
   205     1     1
   229     1     1
      ⋮

Generate PUSCH Symbols and Indices

Create a carrier configuration object with default properties. This object corresponds to 30 kHz of subcarrier spacing and 20 MHz transmission bandwidth.

carrier = nrCarrierConfig;
carrier.SubcarrierSpacing = 30;
carrier.NSizeGrid = 51;

Create a PUSCH configuration object with specified properties. When transform precoding is 1, the waveform type is discrete fourier transform spread orthogonal frequency division multiplexing (DFT-s-OFDM).

pusch = nrPUSCHConfig;
pusch.NStartBWP = 10;
pusch.NSizeBWP = 41;
pusch.Modulation = '16QAM';
pusch.NID = []; % Set NID equal to the NCellID property of carrier.
pusch.PRBSet = 0:5;
pusch.TransformPrecoding = 1;
pusch.FrequencyHopping = 'intraSlot';
pusch.SecondHopStartPRB = 3;

Generate PUSCH indices, setting the index orientation with respect to the carrier grid.

[ind,info] = nrPUSCHIndices(carrier,pusch,'IndexOrientation','carrier')

ind = 864x1 uint32 column vector

   121
   122
   123
   124
   125
   126
   127
   128
   129
   130
      ⋮

info = struct with fields:
                G: 3456
               Gd: 864
        NREPerPRB: 144
    DMRSSymbolSet: [2 7]
    PTRSSymbolSet: [1x0 double]

Generate PUSCH symbols of data type single.

numDataBits = info.G;
cws = randi([0 1],numDataBits,1);
sym = nrPUSCH(carrier,pusch,cws,'OutputDataType','single')

sym = 864x1 single column vector

  -0.7454 + 0.2981i
   0.3406 - 0.2312i
  -0.1153 + 0.2756i
   1.1921 - 0.3658i
  -0.3968 - 0.0277i
  -0.8788 - 0.6493i
  -0.8737 + 0.8318i
  -0.5764 + 0.0269i
  -1.6638 + 0.0482i
  -1.0270 - 0.1347i
      ⋮

Plot the generated symbols and indices on the carrier resource grid.

grid = complex(zeros([carrier.NSizeGrid*12 carrier.SymbolsPerSlot pusch.NumLayers]));
grid(ind) = sym;
imagesc(abs(grid(:,:,1)));
axis xy;
xlabel('OFDM Symbols');
ylabel('Subcarriers');
title('PUSCH Resource Elements in Carrier Resource Grid');

References

[1] 3GPP TS 38.211. “NR; Physical channels and modulation.” 3rd Generation Partnership Project; Technical Specification Group Radio Access Network.

[2] 3GPP TS 38.213. “NR; Physical layer procedures for control.” 3rd Generation Partnership Project; Technical Specification Group Radio Access Network.

Extended Capabilities

C/C++ Code Generation
Generate C and C++ code using MATLAB® Coder™.

Version History

Introduced in R2020a