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TECHNICAL SPECIFICATION
5G;
NR;
Multiplexing and channel coding
(3GPP TS 38.212 version 15.2.0 Release 15)
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3GPP TS 38.212 version 15.2.0 Release 15 1 ETSI TS 138 212 V15.2.0 (2018-07)
Reference
DTS/TSGR-0138212vf20
Keywords
5G
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3GPP TS 38.212 version 15.2.0 Release 15 2 ETSI TS 138 212 V15.2.0 (2018-07)
Intellectual Property Rights
Essential patents
IPRs essential or potentially essential to normative deliverables may have been declared to ETSI. The information
pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found
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Foreword
This Technical Specification (TS) has been produced by ETSI 3rd Generation Partnership Project (3GPP).
The present document may refer to technical specifications or reports using their 3GPP identities, UMTS identities or
GSM identities. These should be interpreted as being references to the corresponding ETSI deliverables.
The cross reference between GSM, UMTS, 3GPP and ETSI identities can be found under
.
Modal verbs terminology
In the present document "shall", "shall not", "should", "should not", "may", "need not", "will", "will not", "can" and
"cannot" are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of
provisions).
"must" and "must not" are NOT allowed in ETSI deliverables except when used in direct citation.
ETSI
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3GPP TS 38.212 version 15.2.0 Release 15 3 ETSI TS 138 212 V15.2.0 (2018-07)
Contents
Intellectual Property Rights . 2
Foreword . 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 . 7
4 Mapping to physical channels . 8
4.1 Uplink . 8
4.2 Downlink . 9
5 General procedures . 9
5.1 CRC calculation . 9
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 . 10
5.3 Channel coding . 12
5.3.1 Polar coding . 13
5.3.1.1 Interleaving . 13
5.3.1.2 Polar encoding . 14
5.3.2 Low density parity check coding . 18
5.3.3 Channel coding of small block lengths . 25
5.3.3.1 Encoding of 1-bit information . 25
5.3.3.2 Encoding of 2-bit information . 25
5.3.3.3 Encoding of other small block lengths . 25
5.4 Rate matching . 26
5.4.1 Rate matching for Polar code . 26
5.4.1.1 Sub-block interleaving . 26
5.4.1.2 Bit selection. 27
5.4.1.3 Interleaving of coded bits . 28
5.4.2 Rate matching for LDPC code . 29
5.4.2.1 Bit selection. 29
5.4.2.2 Bit interleaving . 31
5.4.3 Rate matching for channel coding of small block lengths . 31
5.5 Code block concatenation . 32
6 Uplink transport channels and control information . 32
6.1 Random access channel . 32
6.2 Uplink shared channel . 32
6.2.1 Transport block CRC attachment . 32
6.2.2 LDPC base graph selection . 33
6.2.3 Code block segmentation and code block CRC attachment . 33
6.2.4 Channel coding of UL-SCH. 33
6.2.5 Rate matching . 33
6.2.6 Code block concatenation . 33
6.2.7 Data and control multiplexing . 33
6.3 Uplink control information . 43
6.3.1 Uplink control information on PUCCH . 43
6.3.1.1 UCI bit sequence generation . 43
6.3.1.1.1 HARQ-ACK/SR only . 43
6.3.1.1.2 CSI only . 44
6.3.1.1.3 HARQ-ACK/SR and CSI . 50
ETSI
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3GPP TS 38.212 version 15.2.0 Release 15 4 ETSI TS 138 212 V15.2.0 (2018-07)
6.3.1.2 Code block segmentation and CRC attachment . 51
6.3.1.2.1 UCI encoded by Polar code . 51
6.3.1.2.2 UCI encoded by channel coding of small block lengths . 51
6.3.1.3 Channel coding of UCI . 52
6.3.1.3.1 UCI encoded by Polar code . 52
6.3.1.3.2 UCI encoded by channel coding of small block lengths . 52
6.3.1.4 Rate matching . 52
6.3.1.4.1 UCI encoded by Polar code . 52
6.3.1.4.2 UCI encoded by channel coding of small block lengths . 53
6.3.1.5 Code block concatenation . 54
6.3.1.6 Multiplexing of coded UCI bits to PUCCH . 54
6.3.2 Uplink control information on PUSCH . 56
6.3.2.1 UCI bit sequence generation . 56
6.3.2.1.1 HARQ-ACK . 56
6.3.2.1.2 CSI . 57
6.3.2.2 Code block segmentation and CRC attachment . 59
6.3.2.2.1 UCI encoded by Polar code . 59
6.3.2.2.2 UCI encoded by channel coding of small block lengths . 59
6.3.2.3 Channel coding of UCI . 60
6.3.2.3.1 UCI encoded by Polar code . 60
6.3.2.3.2 UCI encoded by channel coding of small block lengths . 60
6.3.2.4 Rate matching . 60
6.3.2.4.1 UCI encoded by Polar code . 60
6.3.2.4.1.1 HARQ-ACK . 60
6.3.2.4.1.2 CSI part 1 . 62
6.3.2.4.1.3 CSI part 2 . 64
6.3.2.4.2 UCI encoded by channel coding of small block lengths . 66
6.3.2.4.2.1 HARQ-ACK . 66
6.3.2.4.2.2 CSI part 1 . 66
6.3.2.4.2.3 CSI part 2 . 66
6.3.2.5 Code block concatenation . 67
6.3.2.6 Multiplexing of coded UCI bits to PUSCH . 67
7 Downlink transport channels and control information . 67
7.1 Broadcast channel. 67
7.1.1 PBCH payload generation . 67
7.1.2 Scrambling . 68
7.1.3 Transport block CRC attachment . 69
7.1.4 Channel coding . 69
7.1.5 Rate matching . 69
7.2 Downlink shared channel and paging channel . 69
7.2.1 Transport block CRC attachment . 69
7.2.2 LDPC base graph selection . 70
7.2.3 Code block segmentation and code block CRC attachment . 70
7.2.4 Channel coding . 70
7.2.5 Rate matching . 70
7.2.6 Code block concatenation . 70
7.3 Downlink control information . 71
7.3.1 DCI formats . 71
7.3.1.1 DCI formats for scheduling of PUSCH . 71
7.3.1.1.1 Format 0_0 . 71
7.3.1.1.2 Format 0_1 . 74
7.3.1.2 DCI formats for scheduling of PDSCH . 86
7.3.1.2.1 Format 1_0 . 86
7.3.1.2.2 Format 1_1 . 89
7.3.1.3 DCI formats for other purposes . 96
7.3.1.3.1 Format 2_0 . 96
7.3.1.3.2 Format 2_1 . 96
7.3.1.3.3 Format 2_2 . 96
7.3.1.3.4 Format 2_3 . 96
7.3.2 CRC attachment . 97
7.3.3 Channel coding . 97
ETSI
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3GPP TS 38.212 version 15.2.0 Release 15 5 ETSI TS 138 212 V15.2.0 (2018-07)
7.3.4 Rate matching . 98
Annex (informative): Change history . 99
History . 100
ETSI
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3GPP TS 38.212 version 15.2.0 Release 15 6 ETSI TS 138 212 V15.2.0 (2018-07)
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
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3GPP TS 38.212 version 15.2.0 Release 15 7 ETSI TS 138 212 V15.2.0 (2018-07)
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"
3 Definitions, symbols and abbreviations
3.1 Definitions
For the purposes of the present document, the terms and definitions given in 3GPP 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 3GPP
TR 21.905 [1].
3.2 Symbols
For the purposes of the present document, the following symbols apply:
3.3 Abbreviations
For the purposes of the present document, the abbreviations given in 3GPP 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
3GPP TR 21.905 [1].
BCH Broadcast channel
CBG Code block group
CBGTI Code block group transmission information
CORESET Control resource set
CQI Channel quality indicator
ETSI
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3GPP TS 38.212 version 15.2.0 Release 15 8 ETSI TS 138 212 V15.2.0 (2018-07)
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 Dedicated demodulation reference signal
HARQ Hybrid automatic repeat request
HARQ-ACK Hybrid automatic repeat request acknowledgement
LDPC Low density parity check
LI Layer indicator
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
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
SFN System frame number
SR Scheduling request
SRS Sounding reference signal
SS Synchronisation signal
SUL Supplementary uplink
TPC Transmit power control
TrCH Transport channel
UCI Uplink control information
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
ETSI
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3GPP TS 38.212 version 15.2.0 Release 15 9 ETSI TS 138 212 V15.2.0 (2018-07)
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
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 +
...