ETSI TS 138 212 V17.13.0 (2026-02)

5G; NR; Multiplexing and channel coding (3GPP TS 38.212 version 17.13.0 Release 17)

RTS/TSGR-0138212vhd0

General Information

• Status: Not Published
• Technical Committee: 3GPP RAN 1 - Radio layer 1 specification
• Current Stage: 12 - Citation in the OJ (auto-insert)
• Completion Date: 16-Feb-2026

Standards Content (Sample)

TECHNICAL SPECIFICATION
5G;
NR;
Multiplexing and channel coding
(3GPP TS 38.212 version 17.13.0 Release 17)

3GPP TS 38.212 version 17.13.0 Release 17 1 ETSI TS 138 212 V17.13.0 (2026-02)

Reference
RTS/TSGR-0138212vhd0
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5G
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ETSI
3GPP TS 38.212 version 17.13.0 Release 17 2 ETSI TS 138 212 V17.13.0 (2026-02)
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ETSI
3GPP TS 38.212 version 17.13.0 Release 17 3 ETSI TS 138 212 V17.13.0 (2026-02)
Contents
Intellectual Property Rights . 2
Legal Notice . 2
Modal verbs terminology . 2
Foreword . 6
1 Scope . 7
2 References . 7
3 Definitions, symbols and abbreviations . 7
3.1 Definitions . 7
3.2 Symbols . 7
3.3 Abbreviations . 8
4 Mapping to physical channels . 9
4.1 Uplink . 9
4.2 Downlink . 9
4.3 Sidelink . 9
5 General procedures . 10
5.1 CRC calculation . 10
5.2 Code block segmentation and code block CRC attachment . 10
5.2.1 Polar coding . 10
5.2.2 Low density parity check coding . 11
5.3 Channel coding . 13
5.3.1 Polar coding . 13
5.3.1.1 Interleaving . 14
5.3.1.2 Polar encoding . 15
5.3.2 Low density parity check coding . 19
5.3.3 Channel coding of small block lengths . 26
5.3.3.1 Encoding of 1-bit information . 26
5.3.3.2 Encoding of 2-bit information . 26
5.3.3.3 Encoding of other small block lengths . 27
5.4 Rate matching . 27
5.4.1 Rate matching for Polar code . 27
5.4.1.1 Sub-block interleaving . 27
5.4.1.2 Bit selection. 29
5.4.1.3 Interleaving of coded bits . 29
5.4.2 Rate matching for LDPC code . 30
5.4.2.1 Bit selection. 30
5.4.2.2 Bit interleaving . 33
5.4.3 Rate matching for channel coding of small block lengths . 34
5.5 Code block concatenation . 34
6 Uplink transport channels and control information . 34
6.1 Random access channel . 34
6.2 Uplink shared channel . 35
6.2.1 Transport block CRC attachment . 35
6.2.2 LDPC base graph selection . 35
6.2.3 Code block segmentation and code block CRC attachment . 35
6.2.4 Channel coding of UL-SCH. 35
6.2.5 Rate matching . 36
6.2.6 Code block concatenation . 36
6.2.7 Data and control multiplexing . 36
6.3 Uplink control information . 48
6.3.1 Uplink control information on PUCCH . 48
6.3.1.1 UCI bit sequence generation . 48
6.3.1.1.1 HARQ-ACK/SR only . 48
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3GPP TS 38.212 version 17.13.0 Release 17 4 ETSI TS 138 212 V17.13.0 (2026-02)
6.3.1.1.2 CSI only . 48
6.3.1.1.3 HARQ-ACK/SR and CSI . 65
6.3.1.1.4 UCI with different priority indexes . 66
6.3.1.2 Code block segmentation and CRC attachment . 66
6.3.1.2.1 UCI encoded by Polar code . 66
6.3.1.2.2 UCI encoded by channel coding of small block lengths . 67
6.3.1.3 Channel coding of UCI . 67
6.3.1.3.1 UCI encoded by Polar code . 67
6.3.1.3.2 UCI encoded by channel coding of small block lengths . 67
6.3.1.4 Rate matching . 67
6.3.1.4.1 UCI encoded by Polar code . 68
6.3.1.4.2 UCI encoded by channel coding of small block lengths . 68
6.3.1.4.3 UCI with different priority indexes encoded by Polar code . 69
6.3.1.4.4 UCI with different priority indexes encoded by channel coding of small block lengths . 69
6.3.1.5 Code block concatenation . 70
6.3.1.6 Multiplexing of coded UCI bits to PUCCH . 70
6.3.2 Uplink control information on PUSCH . 72
6.3.2.1 UCI bit sequence generation . 73
6.3.2.1.1 HARQ-ACK . 73
6.3.2.1.2 CSI . 73
6.3.2.1.3 CG-UCI . 87
6.3.2.1.4 HARQ-ACK and CG-UCI. 88
6.3.2.1.5 UCI with different priority indexes . 88
6.3.2.2 Code block segmentation and CRC attachment . 90
6.3.2.2.1 UCI encoded by Polar code . 90
6.3.2.2.2 UCI encoded by channel coding of small block lengths . 90
6.3.2.3 Channel coding of UCI . 91
6.3.2.3.1 UCI encoded by Polar code . 91
6.3.2.3.2 UCI encoded by channel coding of small block lengths . 91
6.3.2.4 Rate matching . 91
6.3.2.4.1 UCI encoded by Polar code . 91
6.3.2.4.1.1 HARQ-ACK . 91
6.3.2.4.1.2 CSI part 1 . 94
6.3.2.4.1.3 CSI part 2 . 98
6.3.2.4.1.4 CG -UCI . 101
6.3.2.4.1.5 HARQ-ACK and CG-UCI . 102
6.3.2.4.1.6 UCI with different priority indexes . 103
6.3.2.4.2 UCI encoded by channel coding of small block lengths . 105
6.3.2.4.2.1 HARQ-ACK . 105
6.3.2.4.2.2 CSI part 1 . 105
6.3.2.4.2.3 CSI part 2 . 106
6.3.2.4.2.4 CG -UCI . 106
6.3.2.4.2.5 HARQ-ACK and CG-UCI . 106
6.3.2.4.2.6 UCI with different priority indexes . 106
6.3.2.5 Code block concatenation . 108
6.3.2.6 Multiplexing of coded UCI bits to PUSCH . 108
6.3.2.7 Multiplexing of coded UCI bits with different priority indexes to PUSCH . 108
7 Downlink transport channels and control information . 109
7.1 Broadcast channel. 109
7.1.1 PBCH payload generation . 109
7.1.2 Scrambling . 110
7.1.3 Transport block CRC attachment . 111
7.1.4 Channel coding . 111
7.1.5 Rate matching . 111
7.2 Downlink shared channel and paging channel . 112
7.2.1 Transport block CRC attachment . 112
7.2.2 LDPC base graph selection . 112
7.2.3 Code block segmentation and code block CRC attachment . 112
7.2.4 Channel coding . 112
7.2.5 Rate matching . 113
7.2.6 Code block concatenation . 113
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3GPP TS 38.212 version 17.13.0 Release 17 5 ETSI TS 138 212 V17.13.0 (2026-02)
7.3 Downlink control information . 113
7.3.1 DCI formats . 113
7.3.1.0 DCI size alignment . 114
7.3.1.0.1 DCI size alignment for DCI formats for scheduling of sidelink . 117
7.3.1.1 DCI formats for scheduling of PUSCH . 118
7.3.1.1.1 Format 0_0 . 118
7.3.1.1.2 Format 0_1 . 121
7.3.1.1.3 Format 0_2 . 150
7.3.1.2 DCI formats for scheduling of PDSCH . 160
7.3.1.2.1 Format 1_0 . 160
7.3.1.2.2 Format 1_1 . 163
7.3.1.2.3 Format 1_2 . 180
7.3.1.3 DCI formats for other purposes . 185
7.3.1.3.1 Format 2_0 . 185
7.3.1.3.2 Format 2_1 . 186
7.3.1.3.3 Format 2_2 . 186
7.3.1.3.4 Format 2_3 . 187
7.3.1.3.5 Format 2_4 . 187
7.3.1.3.6 Format 2_5 . 187
7.3.1.3.7 Format 2_6 . 187
7.3.1.3.8 Format 2_7 . 188
7.3.1.4 DCI formats for scheduling of sidelink . 188
7.3.1.4.1 Format 3_0 . 188
7.3.1.4.2 Format 3_1 . 189
7.3.1.5 DCI formats for scheduling of MBS . 190
7.3.1.5.1 Format 4_0 . 190
7.3.1.5.2 Format 4_1 . 190
7.3.1.5.3 Format 4_2 . 191
7.3.2 CRC attachment . 192
7.3.3 Channel coding . 193
7.3.4 Rate matching . 193
8 Sidelink transport channels and control information . 193
8.1 Sidelink broadcast channel . 193
8.1.1 (void) . 194
8.2 Sidelink shared channel . 194
8.2.1 Data and control multiplexing . 194
8.3 Sidelink control information on PSCCH . 195
st
8.3.1 1 -stage SCI formats . 195
8.3.1.1 SCI format 1-A . 195
8.3.2 CRC attachment . 196
8.3.3 Channel coding . 197
8.3.4 Rate Matching . 197
8.4 Sidelink control information on PSSCH . 197
nd
8.4.1 2 -stage SCI formats . 197
8.4.1.1 SCI format 2-A . 197
8.4.1.2 SCI format 2-B . 198
8.4.1.3 SCI format 2-C . 198
8.4.2 CRC attachment . 199
8.4.3 Channel coding . 199
8.4.4 Rate Matching . 199
nd
8.4.5 Multiplexing of coded 2 -stage SCI bits to PSSCH. 200
Annex A (informative): Change history . 201
History . 207

ETSI
3GPP TS 38.212 version 17.13.0 Release 17 6 ETSI TS 138 212 V17.13.0 (2026-02)
Foreword
This Technical Specification has been produced by the 3rd Generation Partnership Project (3GPP).
The contents of the present document are subject to continuing work within the TSG and may change following formal
TSG approval. Should the TSG modify the contents of the present document, it will be re-released by the TSG with an
identifying change of release date and an increase in version number as follows:
Version x.y.z
where:
x the first digit:
1 presented to TSG for information;
2 presented to TSG for approval;
3 or greater indicates TSG approved document under change control.
y the second digit is incremented for all changes of substance, i.e. technical enhancements, corrections,
updates, etc.
z the third digit is incremented when editorial only changes have been incorporated in the document.
ETSI
3GPP TS 38.212 version 17.13.0 Release 17 7 ETSI TS 138 212 V17.13.0 (2026-02)
1 Scope
The present document specifies the coding, multiplexing and mapping to physical channels for 5G NR.
2 References
The following documents contain provisions which, through reference in this text, constitute provisions of the present
document.
- References are either specific (identified by date of publication, edition number, version number, etc.) or
non-specific.
- For a specific reference, subsequent revisions do not apply.
- For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including
a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same
Release as the present document.
[1] 3GPP TR 21.905: "Vocabulary for 3GPP Specifications".
[2] 3GPP TS 38.201: "NR; Physical Layer – General Description"
[3] 3GPP TS 38.202: "NR; Services provided by the physical layer"
[4] 3GPP TS 38.211: "NR; Physical channels and modulation"
[5] 3GPP TS 38.213: "NR; Physical layer procedures for control"
[6] 3GPP TS 38.214: "NR; Physical layer procedures for data"
[7] 3GPP TS 38.215: "NR; Physical layer measurements"
[8] 3GPP TS 38.321: "NR; Medium Access Control (MAC) protocol specification"
[9] 3GPP TS 38.331: "NR; Radio Resource Control (RRC) protocol specification"
[10] 3GPP TS 38.473: "NG-RAN; F1 Application Protocol (F1AP)"
[11] 3GPP TS 36.212: "Evolved Universal Terrestrial Radio Access (E-UTRA); Multiplexing and
channel coding"
[12] 3GPP TS 23.287: "Architecture enhancements for 5G System (5GS) to support Vehicle-to-
Everything (V2X) services"
3 Definitions, symbols and abbreviations
3.1 Definitions
For the purposes of the present document, the terms and definitions given in TR 21.905 [1] and the following apply. A
term defined in the present document takes precedence over the definition of the same term, if any, in TR 21.905 [1].
3.2 Symbols
For the purposes of the present document, the following symbols apply:

ETSI
3GPP TS 38.212 version 17.13.0 Release 17 8 ETSI TS 138 212 V17.13.0 (2026-02)
3.3 Abbreviations
For the purposes of the present document, the abbreviations given in TR 21.905 [1] and the following apply. An
abbreviation defined in the present document takes precedence over the definition of the same abbreviation, if any, in
TR 21.905 [1].
BCH Broadcast channel
CBG Code block group
CBGTI Code block group transmission information
CG Configured grant
CG-DFI CG downlink feedback information
CG-UCI CG uplink control information
CORESET Control resource set
COT Channel occupancy time
CQI Channel quality indicator
CRC Cyclic redundancy check
CRI CSI-RS resource indicator
CSI Channel state information
CSI-RS CSI reference signal
DAI Downlink assignment index
DCI Downlink control information
DL Downlink
DL-SCH Downlink shared channel
DMRS Demodulation reference signal
HARQ Hybrid automatic repeat request
HARQ-ACK Hybrid automatic repeat request acknowledgement
LDPC Low density parity check
LI Layer indicator
MBS Multicast broadcast services
MCS Modulation and coding scheme
OFDM Orthogonal frequency division multiplex
PBCH Physical broadcast channel
PCH Paging channel
PDCCH Physical downlink control channel
PDSCH Physical downlink shared channel
PMI Precoding matrix indicator
PRB Physical resource block
PRACH Physical random access channel
PSBCH Physical sidelink broadcast channel
PSCCH Physical sidelink control channel
PSFCH Physical sidelink feedback channel
PSSCH Physical sidelink shared channel
PTRS Phase-tracking reference signal
PUCCH Physical uplink control channel
PUSCH Physical uplink shared channel
RACH Random access channel
RI Rank indicator
RSRP Reference signal received power
SCI Sidelink control information
SFCI Sidelink feedback control information
SFN System frame number
SL Sidelink
SL-BCH Sidelink broadcast channel
SL-SCH Sidelink shared channel
SR Scheduling request
SRS Sounding reference signal
SS Synchronisation signal
SUL Supplementary uplink
TPC Transmit power control
TrCH Transport channel
UCI Uplink control information
ETSI
3GPP TS 38.212 version 17.13.0 Release 17 9 ETSI TS 138 212 V17.13.0 (2026-02)
UE User equipment
UL Uplink
UL-SCH Uplink shared channel
VRB Virtual resource block
ZP CSI-RS Zero power CSI-RS
4 Mapping to physical channels
4.1 Uplink
Table 4.1-1 specifies the mapping of the uplink transport channels to their corresponding physical channels. Table 4.1-2
specifies the mapping of the uplink control channel information to its corresponding physical channel.
Table 4.1-1
TrCH Physical Channel
UL-SCH PUSCH
RACH PRACH
Table 4.1-2
Control information Physical Channel
UCI PUCCH, PUSCH
4.2 Downlink
Table 4.2-1 specifies the mapping of the downlink transport channels to their corresponding physical channels. Table
4.2-2 specifies the mapping of the downlink control channel information to its corresponding physical channel.
Table 4.2-1
TrCH Physical Channel
DL-SCH PDSCH
BCH PBCH
PCH PDSCH
Table 4.2-2
Control information Physical Channel
DCI PDCCH
4.3 Sidelink
Table 4.3-1 specifies the mapping of the sidelink transport channels to their corresponding physical channels. Table 4.3-
2 specifies the mapping of the sidelink control information and sidelink feedback control information to their
corresponding physical channels.
Table 4.3-1
TrCH Physical Channel
SL-SCH PSSCH
SL-BCH PSBCH
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3GPP TS 38.212 version 17.13.0 Release 17 10 ETSI TS 138 212 V17.13.0 (2026-02)
Table 4.3-2
Control information Physical Channel
st
1 -stage SCI PSCCH
nd
2 -stage SCI PSSCH
SFCI PSFCH
5 General procedures
Data and control streams from/to MAC layer are encoded /decoded to offer transport and control services over the radio
transmission link. Channel coding scheme is a combination of error detection, error correcting, rate matching,
interleaving and transport channel or control information mapping onto/splitting from physical channels.
5.1 CRC calculation
Denote the input bits to the CRC computation by a , a , a , a ,., a , and the parity bits by p , p , p , p ,., p ,
0 1 2 3 A−1 0 1 2 3 L−1
where A is the size of the input sequence and L is the number of parity bits. The parity bits are generated by one of
the following cyclic generator polynomials:
24 23 18 17 14 11 10 7 6 5 4 3
- for a CRC length
()
g D = [D + D + D + D + D + D + D + D + D + D + D + D + D +1]
CRC24A
L = 24;
24 23 6 5
- for a CRC length L = 24;
g ()D = [D + D + D + D + D +1]
CRC24B
24 23 21 20 17 15 13 12 8 4 2
- for a CRC length ;
() L = 24
g D = [D + D + D + D + D + D + D + D + D + D + D + D +1]
CRC24C
16 12 5
- for a CRC length ;
g ()D = [D + D + D +1] L = 16
CRC16
11 10 9 5
- for a CRC length L =11;
g ()D = [D + D + D + D +1]
CRC11
6 5
- for a CRC length L = 6 .
g ()D = [D + D +1]
CRC6
The encoding is performed in a systematic form, which means that in GF(2), the polynomial:
A+L−1 A+L−2 L L−1 L−2 1
a D + a D + . + a D + p D + p D + . + p D + p
0 1 A−1 0 1 L−2 L−1
yields a remainder equal to 0 when divided by the corresponding CRC generator polynomial.

The bits after CRC attachment are denoted by b ,b ,b , b ,.,b , where B = A+ L. The relation between and
a b
0 1 2 3 B−1
k k
is:
b = a for
k = 0,1,2,.,A−1
k k
b = p for .
k = A, A+1, A+ 2,.,A+ L −1
k k − A
5.2 Code block segmentation and code block CRC attachment
5.2.1 Polar coding
The input bit sequence to the code block segmentation is denoted by a , a , a , a ,., a , where .
A > 0
0 1 2 3 A−1
if
I = 1
seg
Number of code blocks: ;
C = 2
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else
Number of code blocks:
C =1
end if
;
A'= A / C ⋅ C

for i = 0 to A'− A −1
a' = 0 ;
i
end for
for i = A'−A to A'−1
;
a' = a
i i−()A'− A
end for
;
s = 0
for r = 0 to C −1
for k = 0 to A'/C −1
;
c = a'
rk s
s = s +1;
end for
The sequence c ,c ,c ,c ,.,c is used to calculate the CRC parity bits p , p , p ,., p according to
r0 r1 r 2 r3 r()A'/C−1 r0 r1 r2 r()L−1
Clause 5.1 with a generator polynomial of length L .
for to
k = A'/C A'/C + L −1
c = p ;
rk r()k−A'/ C
end for
end for
The value of A is no larger than 1706.
5.2.2 Low density parity check coding
The input bit sequence to the code block segmentation is denoted by b ,b ,b , b ,.,b , where B > 0 . If is larger
B
0 1 2 3 B−1
than the maximum code block size , segmentation of the input bit sequence is performed and an additional CRC
K
cb
sequence of L = 24 bits is attached to each code block.
For LDPC base graph 1, the maximum code block size is:
- .
K = 8448
cb
For LDPC base graph 2, the maximum code block size is:
- .
K = 3840
cb
Total number of code blocks C is determined by:
if
B ≤ K
cb
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3GPP TS 38.212 version 17.13.0 Release 17 12 ETSI TS 138 212 V17.13.0 (2026-02)
L = 0
Number of code blocks: C =1
B′ = B
else
L = 24
Number of code blocks: .
C = B /()K − L
 cb 
′
B = B + C ⋅ L
end if
c , c , c , c ,., c
The bits output from code block segmentation are denoted by , where 0 ≤ r < C is the code
r0 r1 r2 r3 r()K −1
r
block number, and is the number of bits for the code block number r .
K = K
r
The number of bits K in each code block is calculated as:
K '= B'/ C ;
For LDPC base graph 1,
.
K = 22
b
For LDPC base graph 2,
if B > 640
;
K =10
b
elseif B > 560
;
K = 9
b
elseif B >192
;
K = 8
b
else
;
K = 6
b
end if
find the minimum value of Z in all sets of lifting sizes in Table 5.3.2-1, denoted as , such that , and
Z K ⋅ Z ≥ K'
c b c
set for LDPC base graph 1 and for LDPC base graph 2;
K = 22Z K =10Z
c c
The bit sequence is calculated as:
c
rk
s = 0
;
r = 0 C −1
for to
k = 0
for to K'−L −1
c = b
rk s
;
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s = s +1
;
end for
C >1
if
The sequence is used to calculate the CRC parity bits
c ,c ,c ,c ,.,c p , p , p ,., p
r0 r1 r 2 r3 r()K '−L−1 r0 r1 r2 r()L−1
according to Clause 5.1 with the generator polynomial .
g ()D
CRC24B
k = K'−L
for to K'−1
c = p
rk r()k+L−K '
;
end for
end if
k = K'
for to K −1 -- Insertion of filler bits
c =< NULL >
rk
;
end for
end for
5.3 Channel coding
Usage of coding scheme for the different types of TrCH is shown in table 5.3-1. Usage of coding scheme for the
different control information types is shown in table 5.3-2.
Table 5.3-1: Usage of channel coding scheme for TrCHs
TrCH Coding scheme
UL-SCH
DL-SCH LDPC
PCH
BCH Polar code
Table 5.3-2: Usage of channel coding scheme for control information
Control Information Coding scheme
DCI Polar code
Block code
UCI
Polar code
5.3.1 Polar coding
The bit sequence input for a given code block to channel coding is denoted by c , c , c , c ,., c , where is the
K
0 1 2 3 K −1
n
number of bits to encode. After encoding the bits are denoted by , where N = 2 and the value of n is
d ,d ,d ,.,d
0 1 2 N −1
determined by the following:
Denote by the rate matching output sequence leng
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