ETSI TS 101 851-2-2 V2.1.1 (2008-01)

ETSI TS 101 851-2-2 V2.1.1 (2008-01)
Technical Specification


Satellite Earth Stations and Systems (SES);
Satellite Component of UMTS/IMT-2000;
Part 2: Multiplexing and channel coding;
Sub-part 2: A-family (S-UMTS-A 25.212)

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2 ETSI TS 101 851-2-2 V2.1.1 (2008-01)



Reference
RTS/SES-00298-2-2
Keywords
MES, MSS, satellite, UMTS
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3 ETSI TS 101 851-2-2 V2.1.1 (2008-01)
Contents
Intellectual Property Rights.5
Foreword.5
Introduction .5
1 Scope.7
2 References.7
2.1 Normative references.7
2.2 Informative references.8
3 Definitions, symbols and abbreviations .8
3.1 Definitions.8
3.2 Symbols.8
3.3 Abbreviations.9
4 Multiplexing, channel coding and interleaving.9
4.1 General.9
4.2 Transport-channel coding / multiplexing .9
4.2.1 Error detection.13
4.2.1.1 CRC Calculation.13
4.2.1.1.1 Relation between input and output of the Cyclic Redundancy Check.13
4.2.2 Transport block concatenation and code block segmentation.14
4.2.2.1 Concatenation of transport blocks.14
4.2.2.2 Code block segmentation .14
4.2.3 Channel coding.15
4.2.3.1 Convolutional coding.16
4.2.3.2 Turbo coding.16
4.2.3.2.1 Turbo coder .16
4.2.3.2.2 Trellis termination for Turbo coder .17
4.2.3.2.3 Turbo code internal interleaver.17
4.2.3.3 Concatenation of encoded blocks.21
4.2.4 Radio frame size equalization.21
st
4.2.5 1 interleaving .22
4.2.5.1 Insertion of marked bits in the sequence to be input in first interleaver.22
st
4.2.5.2 1 interleaver operation.23
st
4.2.5.3 Relation between input and output of 1 interleaving in uplink.24
st
4.2.5.4 Relation between input and output of 1 interleaving in downlink.24
4.2.6 Radio frame segmentation .24
4.2.6.1 Relation between input and output of the radio frame segmentation block in uplink .24
4.2.6.2 Relation between input and output of the radio frame segmentation block in downlink .25
4.2.7 Rate matching.25
4.2.7.1 Determination of rate matching parameters in uplink.27
4.2.7.1.1 Determination of SF and number of PhCHs needed.27
4.2.7.1.2 Determination of parameters needed for calculating the rate-matching pattern .28
4.2.7.2 Determination of rate matching parameters in downlink .30
4.2.7.2.1 Determination of rate matching parameters for fixed positions of TrCHs .31
4.2.7.2.2 Determination of rate matching parameters for flexible positions of TrCHs .34
4.2.7.3 Bit separation and collection in uplink.36
4.2.7.3.1 Bit separation.38
4.2.7.3.2 Bit collection.38
4.2.7.4 Bit separation and collection in downlink.39
4.2.7.4.1 Bit separation.40
4.2.7.4.2 Bit collection.40
4.2.7.5 Rate matching pattern determination .41
4.2.8 TrCH multiplexing.42
4.2.9 Insertion of discontinuous transmission (DTX) indication bits .42
st
4.2.9.1 1 insertion of DTX indication bits.42
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4 ETSI TS 101 851-2-2 V2.1.1 (2008-01)
nd
4.2.9.2 2 insertion of DTX indication bits .43
4.2.10 Physical channel segmentation.44
4.2.10.1 Relation between input and output of the physical segmentation block in uplink .44
4.2.10.2 Relation between input and output of the physical segmentation block in downlink .44
nd
4.2.11 2 interleaving.45
4.2.12 Physical channel mapping.45
4.2.12.1 Uplink.46
4.2.12.2 Downlink.46
4.2.13 Restrictions on different types of CCTrCHs.46
4.2.13.1 Uplink Dedicated channel (DCH) .46
4.2.13.2 Random Access Channel (RACH).47
4.2.13.3 Downlink Dedicated Channel (DCH) .47
4.2.13.4 Downlink Shared Channel (DSCH) associated with a DCH.47
4.2.13.5 Broadcast channel (BCH) .47
4.2.13.6 Forward access and paging channels (FACH and PCH).47
4.2.14 Multiplexing of different transport channels into one CCTrCH, and mapping of one CCTrCH onto
physical channels .48
4.2.14.1 Allowed CCTrCH combinations for one UE .48
4.2.14.1.1 Allowed CCTrCH combinations on the uplink .48
4.2.14.1.2 Allowed CCTrCH combinations on the downlink .48
4.2.15 Downlink data randomization.49
4.3 Transport format detection .49
4.3.1 Blind transport format detection .50
4.3.2 Transport format detection based on TFCI.50
4.3.3 Coding of Transport-Format-Combination Indicator and Power Control Commands (TFCI / TPC).50
4.3.4 Operation of Transport-Format-Combination Indicator and Power Control Command (TFCI / TPC)
in Split Mode .52
4.3.5 Mapping of TFCI / TPC words.53
4.3.5.1 Mapping of TFCI / TPC word in normal mode.53
4.3.5.2 Mapping of TFCI / TPC word in compressed mode .53
4.3.5.2.1 Uplink compressed mode.53
4.3.5.2.2 Downlink compressed mode.54
4.4 Compressed mode .54
4.4.1 Frame structure in the uplink .55
4.4.2 Frame structure types in the downlink.55
4.4.3 Transmission time reduction method.55
4.4.3.1 Compressed mode by puncturing.55
4.4.3.2 Compressed mode by reducing the spreading factor by 2.56
4.4.3.3 Compressed mode by higher layer scheduling.56
4.4.4 Transmission gap position.56
Annex A (informative): Blind transport format detection.58
A.1 Blind transport format detection using fixed positions .58
A.1.1 Blind transport format detection using received power ratio.58
A.1.2 Blind transport format detection using CRC .58
Annex B (informative): Compressed mode idle lengths.61
B.1 Idle lengths for DL, UL and DL + UL compressed mode .61
Annex C (informative): Bibliography.63
History .64

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5 ETSI TS 101 851-2-2 V2.1.1 (2008-01)
Intellectual Property Rights
IPRs essential or potentially essential to the present document 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
in ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in
respect of ETSI standards", which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web
server (http://webapp.etsi.org/IPR/home.asp).
Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee
can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web
server) which are, or may be, or may become, essential to the present document.
Foreword
This Technical Specification (TS) has been produced by ETSI Technical Committee Satellite Earth Stations and
Systems (SES).
The present document is specifying the Satellite Radio Interface referenced as SRI Family A at ITU-R, in the frame of
ITU-R Recommendation M.1457 [7].
The present document is part 2, sub-part 2 of a multi-part deliverable covering Satellite Earth Stations and Systems
(SES); Satellite Component of UMTS/IMT-2000; A-family, as identified below:
Part 1: "Physical channels and mapping of transport channels into physical channels";
Part 2: "Multiplexing and channel coding";
Sub-part 1: "G-family (S-UMTS-G 25.212)";
Sub-part 2: "A-family (S-UMTS-A 25.212)";
Part 3: "Spreading and modulation";
Part 4: "Physical layer procedures";
Part 5: "UE Radio Transmission and Reception";
Part 6: "Ground stations and space segment radio transmission and reception".
Introduction
S-UMTS stands for the Satellite component of the Universal Mobile Telecommunication System. S-UMTS systems will
complement the terrestrial UMTS (T-UMTS) and inter-work with other IMT-2000 family members through the UMTS
rd
core network. S-UMTS will be used to deliver 3 generation mobile satellite services (MSS) utilizing either low (LEO)
or medium (MEO) earth orbiting, or geostationary (GEO) satellite(s). S-UMTS systems are based on terrestrial 3GPP
specifications and will support access to GSM / UMTS core networks.
NOTE 1: The term T-UMTS will be used in the present document to further differentiate the Terrestrial UMTS
component.
Due to the differences between terrestrial and satellite channel characteristics, some modifications to the terrestrial
UMTS (T-UMTS) standards are necessary. Some specifications are directly applicable, whereas others are applicable
with modifications. Similarly, some T-UMTS specifications do not apply, whilst some S-UMTS specifications have no
corresponding T-UMTS specification.
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6 ETSI TS 101 851-2-2 V2.1.1 (2008-01)
Since S-UMTS is derived from T-UMTS, the organization of the S-UMTS specifications closely follows the original
rd
3 Generation Partnership Project (3GPP) structure. The S-UMTS numbers have been designed to correspond to the
3GPP terrestrial UMTS numbering system. All S-UMTS specifications are allocated a unique S-UMTS number as
follows:
S-UMTS-n xx.yyy
Where:
• The numbers xx and yyy correspond to the 3GPP-numbering scheme,
• n (n = A, B, C, …) denotes the family of S-UMTS specifications.
A S-UMTS system is defined by the combination of a family of S-UMTS specifications and 3GPP specifications, as
follows:
• If an S-UMTS specification exists it takes precedence over the corresponding 3GPP specification (if any). This
precedence rule applies to any references in the corresponding 3GPP specifications.
NOTE 2: Any references to 3GPP specifications within the S-UMTS specifications are not subject to this
precedence rule. For example, an S-UMTS specification may contain specific references to the
corresponding 3GPP specification.
• If a S-UMTS specification does not exist, the corresponding 3GPP specification may or may not apply. The exact
applicability of the complete list of 3GPP specifications shall be defined at a later stage.
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7 ETSI TS 101 851-2-2 V2.1.1 (2008-01)
1 Scope
The present document describes the characteristics of the Layer 1 multiplexing and channel coding used for family A of
the satellite component of UMTS (S-UMTS-A).
It is based on the FDD mode of UTRA defined by TS 125 211 [2], TS 125 212 [3], TS 125 213 [4], TS 125 214 [5] and
adapted for operation over satellite transponders.
2 References
References are either specific (identified by date of publication and/or edition number or version number) or
non-specific.
• For a specific reference, subsequent revisions do not apply.
• Non-specific reference may be made only to a complete document or a part thereof and only in the following
cases:
- if it is accepted that it will be possible to use all future changes of the referenced document for the
purposes of the referring document;
- for informative references.
Referenced documents which are not found to be publicly available in the expected location might be found at
http://docbox.etsi.org/Reference.
For online referenced documents, information sufficient to identify and locate the source shall be provided. Preferably,
the primary source of the referenced document should be cited, in order to ensure traceability. Furthermore, the
reference should, as far as possible, remain valid for the expected life of the document. The reference shall include the
method of access to the referenced document and the full network address, with the same punctuation and use of upper
case and lower case letters.
NOTE: While any hyperlinks included in this clause were valid at the time of publication ETSI cannot guarantee
their long term validity.
2.1 Normative references
The following referenced documents are indispensable for the application of the present document. For dated
references, only the edition cited applies. For non-specific references, the latest edition of the referenced document
(including any amendments) applies.
[1] ETSI TS 101 851-1-2: "Satellite Earth Stations and Systems (SES); Satellite Component of
UMTS/IMT-2000; Part 1: Physical channels and mapping of transport channels into physical
channels; Sub-part 2: A-family (S-UMTS-A 25.211)".
[2] ETSI TS 125 211: "Universal Mobile Telecommunications System (UMTS); Physical channels
and mapping of transport channels onto physical channels (FDD) (3G TS 25.211 version 3.3.0
Release 1999)".
[3] ETSI TS 125 212: "Universal Mobile Telecommunications System (UMTS); Multiplexing and
channel coding (FDD) (3G TS 25.212 version 3.3.0 Release 1999)".
[4] ETSI TS 125 213: "Universal Mobile Telecommunications System (UMTS); Spreading and
modulation (FDD) (3G TS 25.213 version 3.3.0 Release 1999)".
[5] ETSI TS 125 214: "Universal Mobile Telecommunications System (UMTS); Physical layer
procedures (FDD) (3G TS 25.214 version 3.3.0 Release 1999)".
[6] ETSI TS 125 302: "Universal Mobile Telecommunications System (UMTS); Services provided by
the Physical Layer (3G TS 25.302 version 3.5.0 Release 1999)".
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8 ETSI TS 101 851-2-2 V2.1.1 (2008-01)
2.2 Informative references
[7] ITU-R Recommendation M.1457 (2006): "Detailed specifications of the radio interfaces of
International Mobile Telecommunications-2000 (IMT-2000)".
3 Definitions, symbols and abbreviations
3.1 Definitions
For the purposes of the present document, the following terms and definitions apply:
Transmission Gap (TG): consecutive empty slots that have been obtained with a transmission time reduction method.
The transmission gap can be contained in one or two consecutive radio frames
Transmission Gap Length (TGL): number of consecutive empty slots that have been obtained with a transmission
time reduction method. 0 ≤ TGL ≤ 14
3.2 Symbols
For the purposes of the present document, the following symbols apply:
⎡x ⎤ round towards ∞, i.e. integer such that x ≤ ⎡x ⎤ < x + 1
⎣x ⎦ round towards -∞, i.e. integer such that x-1 < ⎣x ⎦ ≤ x
⎜x ⎜ absolute value of x
N The first slot in the TG
first
N The last slot in the TG. N is either a slot in the same radio frame as N or a slot in the radio
last last first
frame immediately following the slot that contains N
first
Unless otherwise is explicitly stated when the symbol is used, the meaning of the following symbols is:
i TrCH number
j TFC number
k Bit number
l TF number
m Transport block number
n Radio frame number of TrCH i
i
p PhCH number
r Code block number
I Number of TrCHs in a CCTrCH
C Number of code blocks in one TTI of TrCH i
i
F Number of radio frames in one TTI of TrCH i
i
M Number of transport blocks in one TTI of TrCH i
i
P Number of PhCHs used for one CCTrCH
PL Puncturing Limit for the uplink. Signalled from higher layers
RM Rate Matching attribute for TrCH i. Signalled from higher layers
i
Temporary variables, i.e. variables used in several (sub)clauses with different meaning.
x, X
y, Y
z, Z
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9 ETSI TS 101 851-2-2 V2.1.1 (2008-01)
3.3 Abbreviations
For the purposes of the present document, the following abbreviations apply:
BCH Broadcast Channel
BER Bit Error Rate
CCPCH Common Control Physical Channel
CCTrCH Coded Composite Transport Channel
CPCH Common Packet Channel
CRC Cyclic Redundancy Code
DCH Dedicated Channel
DL Downlink (Forward link)
DPCH Dedicated Physical Channel
DPCCH Dedicated Physical Control Channel
DPDCH Dedicated Physical Data Channel
DSCH Downlink Shared Channel
DTX Discontinuous Transmission
FACH Forward Access Channel
FDD Frequency Division Duplex
FER Frame Error Rate
GF Galois Field
MAC Medium Access Control
MS Mobile Station
PCCC Parallel Concatenated Convolutional Code
PCH Paging Channel
PRACH Physical Random Access Channel
PhCH Physical Channel
RACH Random Access Channel
SF Spreading Factor
SFN System Frame Number
TF Transport Format
TFC Transport Format Combination
TFCI Transport Format Combination Indicator
TPC Transmit Power Control
TrCH Transport Channel
TTI Transmission Time Interval
UL Uplink (Reverse link)
4 Multiplexing, channel coding and interleaving
4.1 General
Data stream from / to MAC and higher layers (Transport block / Transport block set) is encoded / decoded to offer
transport services over the radio transmission link. Channel coding scheme is a combination of error detection, error
correcting, rate matching, interleaving and transport channels mapping onto / splitting from physical channels.
4.2 Transport-channel coding / multiplexing
Data arrives to the coding / multiplexing unit in form of transport block sets once every transmission time interval. The
transmission time interval is transport-channel specific from the set {10 ms, 20 ms, 40 ms, 80 ms}.
The following coding / multiplexing steps can be identified:
- add CRC to each transport block (see clause 4.2.1);
- transport block concatenation and code block segmentation (see clause 4.2.2);
- channel coding (see clause 4.2.3);
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10 ETSI TS 101 851-2-2 V2.1.1 (2008-01)
- rate matching (see clause 4.2.7);
- insertion of discontinuous transmission (DTX) indication bits (see clause 4.2.9);
- interleaving (two steps, see clauses 4.2.4 and 4.2.11);
- radio frame segmentation (see clause 4.2.6);
- multiplexing of transport channels (see clause 4.2.8);
- physical channel segmentation (see clause 4.2.10);
- mapping to physical channels (see clause 4.2.12);
- data scrambling (only for downlink, and optional) (see clause 4.2.15).
The coding / multiplexing steps for uplink and downlink are shown in figures 1 and 2 respectively.
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PhCH#2
PhCH#1
 11 ETSI TS 101 851-2-2 V2.1.1 (2008-01)
a ,a ,a ,K,a
im1 im2 im3 imA
i
CRC attachment
b ,b ,b ,K,b
im1 im2 im3 imB
i
TrBk concatenation /
Code block segmentation
o ,o ,o ,K,o
ir1 ir 2 ir3 irK
i
Channel coding
c ,c ,c ,K,c
i1 i2 i3 iE
i
Radio frame equalisation
t ,t ,t ,K,t
i1 i2 i3 iT
i
st
1 interleaving
d ,d ,d ,K,d
i1 i2 i3 iT
i
Radio frame segmentation
e ,e ,e ,K,e
i1 i2 i3 iN
i
Rate
Rate matching
matching
f , f , f ,K, f
i1 i2 i3 iV
i
TrCH Multiplexing
s ,s ,s ,K,s
1 2 3 S
Physical channel
segmentation
u ,u ,u ,K,u
p1 p2 p3 pU
nd
2 interleaving
v ,v ,v ,K,v
p1 p2 p3 pU
Physical channel mapping

Figure 1: Transport channel multiplexing structure for uplink
ETSI

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