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getTransportBlock

Get transport block from UL-SCH or DL-SCH encoder

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Syntax

trblk = getTransportBlock(encUL)
trblk = getTransportBlock(encDL,trblkID)
trblk = getTransportBlock(___,harqID)
trblk = getTransportBlock(encUL,Name=Value)
trblk = getTransportBlock(encDL,Name=Value)

Description

The getTransportBlock function returns a transport block from an uplink shared channel (UL-SCH) encoder or downlink shared channel (DL-SCH) encoder System object™. The function assumes that the transport block was previously loaded into the encoder by using the setTransportBlock object function.

trblk = getTransportBlock(encUL) returns the transport block number 0 from the specified UL-SCH encoder encUL. When the UL-SCH encoder is loaded with two transport blocks, the function returns transport block number 0.

trblk = getTransportBlock(encDL,trblkID) returns the transport block from the specified DL-SCH encoder encDL for the specified transport block number trblkID.

example

trblk = getTransportBlock(___,harqID) returns the transport block loaded for the specified hybrid automatic repeat-request (HARQ) process number harqID. Specify harqID in addition to the input arguments in any of the previous syntaxes.

example

trblk = getTransportBlock(encUL,Name=Value) and trblk = getTransportBlock(encDL,Name=Value) specify options using one or more name-value arguments. For example, to specify transport block number 1, set BlockID to 1. (since R2024a)

Examples

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Open Live Script

Generate a random sequence of binary values corresponding to one transport block of length 5120. 

trBlkLen1 = 5120;
trBlk1 = randi([0 1],trBlkLen1,1,'int8');

Create and configure an UL-SCH encoder System object with multiple HARQ processes and the specified target code rate.

targetCodeRate = 567/1024;
encUL = nrULSCH('MultipleHARQProcesses',true);
encUL.TargetCodeRate = targetCodeRate;

Load the transport block into the UL-SCH encoder for HARQ process number 1. 

setTransportBlock(encUL,trBlk1,1);

Call the encoder with QPSK modulation scheme, 1 transmission layer, an output length of 10,240 bits, redundancy version 0, and HARQ process number 1. The encoder applies the UL-SCH processing chain to the transport block loaded into the object using HARQ process number 1.

encUL('QPSK',1,10240,0,1);

Retrieve the transport block from the encoder for HARQ process number 1. Verify that the retrieved block is identical to the block originally loaded into the encoder for this HARQ process.

tmp = getTransportBlock(encUL,1);
isequal(tmp,trBlk1) 
ans = logical
   1

Repeat the encoding operation for a new transport block of length 4400 and HARQ process number 2.

trBlkLen2 = 4400;
trBlk2 = randi([0 1],trBlkLen2,1,'int8');
setTransportBlock(encUL,trBlk2,2); 
encUL('QPSK',1,8800,0,2);

Retrieve the first transport block again. Verify that the first transport block is still unchanged.

tmp = getTransportBlock(encUL,1);
isequal(tmp,trBlk1)
ans = logical
   1
Open Live Script

Generate a random sequence of binary values corresponding to one transport block of length 5120. 

trBlkLen = 5120;
trBlk = randi([0 1],trBlkLen,1,'int8');

Create and configure a DL-SCH encoder System object with multiple HARQ processes and the specified target code rate.

targetCodeRate = 567/1024;
encDL = nrDLSCH('MultipleHARQProcesses',true);
encDL.TargetCodeRate = targetCodeRate;

Load transport block trBlk for transport block number 0 into the DL-SCH encoder, specifying HARQ process number 2. 

harqID = 2;
trBlkID = 0;
setTransportBlock(encDL,trBlk,trBlkID,harqID);

Call the encoder with QPSK modulation scheme, 3 transmission layers, an output length of 10,002 bits, and redundancy version 3. The encoder applies the DL-SCH processing chain to the transport block loaded into the object for HARQ process number 2.

mod = 'QPSK';
nLayers = 3;
outlen = 10002;
rv = 3;
codedTrBlock = encDL(mod,nLayers,outlen,rv,harqID);

Retrieve the transport block for transport block number 0 from the encoder, specifying HARQ process number 2. Verify that the retrieved block is identical to the block originally loaded into the encoder for this HARQ process.

tmp = getTransportBlock(encDL,trBlkID,harqID);
isequal(tmp,trBlk)
ans = logical
   1

Input Arguments

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UL-SCH encoder, specified as an nrULSCH System object. The object implements the UL-SCH processing chain specified in TS 38.212 Section 6.2.

DL-SCH encoder, specified as an nrDLSCH System object. The object implements the DL-SCH processing chain specified in TS 38.212 Section 7.2.

Transport block number in DL-SCH processing, specified as 0 or 1.

Data Types: double

HARQ process number, specified as an integer from 0 to 31. To specify a value other than 0, set the MultipleHARQProcesses object property to true.

Data Types: double

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.

Example: getTransportBlock(encUL,HARQI=10,BlockID=1)

Since R2024a

HARQ process number, specified as an integer from 0 to 31. To specify a value other than 0, set the MultipleHARQProcesses object property to true.

Data Types: double

Since R2024a

Transport block number, specified as 0 or 1.

Data Types: double

Output Arguments

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Transport block, returned as a binary column vector.

Data Types: int8

References

[1] 3GPP TS 38.212. “NR; Multiplexing and channel coding.” 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 R2019a

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See Also

Functions

Objects