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nrPDCCHSpace

Generate PDCCH resources for all candidates and aggregation levels

Since R2020a

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Syntax

allInd = nrPDCCHSpace(carrier,pdcch)
[allInd,allDMRSSym,allDMRSInd] = nrPDCCHSpace(carrier,pdcch)
[allInd,allDMRSSym,allDMRSInd] = nrPDCCHSpace(carrier,pdcch,Name,Value)

Description

allInd = nrPDCCHSpace(carrier,pdcch) returns physical downlink control channel (PDCCH) resource element indices allInd for all candidates at each aggregation level, as defined in TS 38.211 Section 7.3.2 [1]. The input carrier specifies carrier configuration parameters for a specific OFDM numerology. The input pdcch specifies PDCCH configuration parameters.

example

[allInd,allDMRSSym,allDMRSInd] = nrPDCCHSpace(carrier,pdcch) also returns PDCCH demodulation reference signal (DM-RS) symbols allDMRSSym and PDCCH DM-RS resource element indices allDMRSInd for all candidates at each aggregation level, as defined in TS 38.211 Section 7.4.1.3.

example

[allInd,allDMRSSym,allDMRSInd] = nrPDCCHSpace(carrier,pdcch,Name,Value) specifies output formatting options using one or more name-value pair arguments.

example

Examples

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Open Live Script

Configure the carrier and the PDCCH with default configuration parameters.

carrier = nrCarrierConfig;
pdcch = nrPDCCHConfig;

Generate all PDCCH resource element indices for all candidates and aggregation levels. 

allInd = nrPDCCHSpace(carrier,pdcch)
allInd=5×1 cell array
    { 54x8 uint32}
    {108x8 uint32}
    {216x4 uint32}
    {432x2 uint32}
    {864x1 uint32}

Verify that the number of generated candidates for the PDCCH indices at each aggregation level matches the number of candidates specified by the default search space set.

numCandidates = [...
    size(allInd{1},2) ... 
    size(allInd{2},2) ... 
    size(allInd{3},2) ... 
    size(allInd{4},2) ... 
    size(allInd{5},2)];
isequaln(pdcch.SearchSpace.NumCandidates,numCandidates)
ans = logical
   1
Open Live Script

Configure the carrier with default configuration parameters. 

carrier = nrCarrierConfig;

Configure the CORESET with 6 frequency resources, a duration of 3 OFDM symbols, and a REG bundle size of 3.

crst = nrCORESETConfig;
crst.FrequencyResources = ones(1,6);
crst.Duration = 3;
crst.REGBundleSize = 3;

Configure the search space set for the PDCCH with the specified number of candidates at each aggregation level.

cfgSS = nrSearchSpaceConfig;
cfgSS.NumCandidates = [5 5 3 2 1];

Configure the PDCCH with the specified bandwidth part, CORESET, and search space set.

pdcch = nrPDCCHConfig;
pdcch.NStartBWP = 6;
pdcch.NSizeBWP = 36;
pdcch.CORESET = crst;
pdcch.SearchSpace = cfgSS;

Generate PDCCH DM-RS symbols for all candidates and aggregation levels. 

[~,allDMRS] = nrPDCCHSpace(carrier,pdcch)
allDMRS=5×1 cell array
    { 18x5 double}
    { 36x5 double}
    { 72x3 double}
    {144x2 double}
    {288x1 double}

Verify that the number of generated candidates for the PDCCH DM-RS symbols at each aggregation level matches the number of candidates specified by the search space set. 

numCandidates = [...
    size(allDMRS{1},2) ... 
    size(allDMRS{2},2) ... 
    size(allDMRS{3},2) ... 
    size(allDMRS{4},2) ... 
    size(allDMRS{5},2)];
isequaln(cfgSS.NumCandidates,numCandidates)
ans = logical
   1
Open Live Script

Configure a carrier grid of 60 resource blocks (RBs), where the starting RB index relative to the common resource block 0 (CRB 0) is 3. 

carrier = nrCarrierConfig;
carrier.NStartGrid = 3;
carrier.NSizeGrid = 60;

Configure noninterleaved CORESET with 6 frequency resources and a duration of 3 OFDM symbols.

crst = nrCORESETConfig;
crst.FrequencyResources = ones(1,6);
crst.Duration = 3;
crst.CCEREGMapping = 'noninterleaved';

Configure the search space set for the PDCCH with the specified number of candidates at each aggregation level.

cfgSS = nrSearchSpaceConfig;
cfgSS.NumCandidates = [5 5 3 2 1];

Configure the PDCCH with the specified bandwidth part, CORESET, and search space set.

pdcch = nrPDCCHConfig;
pdcch.NStartBWP = 5;
pdcch.NSizeBWP = 48;
pdcch.CORESET = crst;
pdcch.SearchSpace = cfgSS;

Generate PDCCH DM-RS resource element indices for all candidates and aggregation levels using 1-based, subscript indexing form relative to the BWP grid. 

[~,~,allDMRSInd] = nrPDCCHSpace(carrier,pdcch, ...
    'IndexOrientation','bwp','IndexStyle','subscript')
allDMRSInd=5×1 cell array
    { 18x3x5 uint32}
    { 36x3x5 uint32}
    { 72x3x3 uint32}
    {144x3x2 uint32}
    {288x3   uint32}

Verify that the number of generated candidates for PDCCH DM-RS indices at each aggregation level matches the number of candidates specified by the search space set.

numCandidates = [...
    size(allDMRSInd{1},3) ... 
    size(allDMRSInd{2},3) ... 
    size(allDMRSInd{3},3) ... 
    size(allDMRSInd{4},3) ... 
    size(allDMRSInd{5},3)];
isequaln(cfgSS.NumCandidates,numCandidates)
ans = logical
   1

Input Arguments

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Carrier configuration parameters for a specific OFDM numerology, specified as an nrCarrierConfig object.

PDCCH configuration parameters, specified as an nrPDCCHConfig object.

Name-Value Arguments

Specify optional pairs of arguments as Name1=Value1,...,NameN=ValueN, where Name is the argument name and Value is the corresponding value. Name-value arguments must appear after other arguments, but the order of the pairs does not matter.

Before R2021a, use commas to separate each name and value, and enclose Name in quotes.

Example: 'IndexStyle','subscript','IndexBase','0based' specifies the indexing form and indexing base of the output.

RE indexing form, specified as one of these values:

  • 'index' — The indices are in linear index form.

  • 'subscript' — The indices are in [subcarrier, symbol, antenna] subscript row form.

Data Types: char | string

RE indexing base, specified as one of these values:

  • '1based' — The index counting starts from 1.

  • '0based' — The index counting starts from 0.

Data Types: char | string

Indexing orientation of PDCCH and DM-RS resource elements, specified as the comma-separated pair consisting of 'IndexOrientation' and one of these values:

  • 'carrier' — Indices are referenced with respect to the carrier grid.

  • 'bwp' — Indices are referenced with respect to the bandwidth part.

Data Types: char | string

Data type of PDCCH DM-RS symbols, specified as the comma-separated pair consisting of 'OutputDataType' and one of these values:

  • 'double' — Output symbols are of double data type.

  • 'single' — Output symbols are of single data type.

Data Types: char | string

Output Arguments

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PDCCH resource element indices for all candidates at each aggregation level, returned as a 5-by-1 cell array. The five cells correspond to aggregation levels 1, 2, 4, 8, and 16, respectively. Each cell contains a matrix corresponding to all candidates at the appropriate aggregation level. The dimensionality of all matrices is either two or three, depending on the 'IndexStyle' name-value pair argument. The last dimension of each matrix corresponds to the number of candidates specified by the pdcch.SearchSpace.NumCandidates property for the appropriate aggregation level.

Data Types: uint32

PDCCH DM-RS symbols for all candidates at each aggregation level, returned as a 5-by-1 cell array. The five cells correspond to aggregation levels 1, 2, 4, 8, and 16, respectively. Each cell contains a 2-D matrix corresponding to all candidates at the appropriate aggregation level. The number of matrix columns in each cell corresponds to the number of candidates specified by the pdcch.SearchSpace.NumCandidates property for the appropriate aggregation level.

Data Types: single | double

PDCCH DM-RS resource element indices for all candidates at each aggregation level, returned as a 5-by-1 cell array. The five cells correspond to aggregation levels 1, 2, 4, 8, and 16, respectively. Each cell contains a matrix corresponding to all candidates at the appropriate aggregation level. The dimensionality of all matrices is either two or three, depending on the 'IndexStyle' name-value pair argument. The last dimension of each matrix corresponds to the number of candidates specified by the pdcch.SearchSpace.NumCandidates property for the appropriate aggregation level.

Data Types: uint32

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

Version History

Introduced in R2020a

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See Also

Functions

Objects

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