ETSI TS 101 851-2-1 V2.1.1 (2008-01)

ETSI TS 101 851-2-1 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 1: G-family (S-UMTS-G 25.212)

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2 ETSI TS 101 851-2-1 V2.1.1 (2008-01)



Reference
RTS/SES-00298-2-1
Keywords
interface, MES, MSS, radio, satellite, UMTS
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3 ETSI TS 101 851-2-1 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.10
4.1 General.10
4.2 General coding/multiplexing of TrCHs.10
4.2.1 CRC attachment.13
4.2.1.1 CRC Calculation.13
4.2.1.2 Relation between input and output of the CRC attachment block.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 .21
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.23
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 .24
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
4.2.7.1.3 Convolutionally encoded TrCHs .28
4.2.7.1.4 Turbo encoded TrCHs .29
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.41
4.2.7.5 Rate matching pattern determination .41
4.2.8 TrCH multiplexing.42
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4 ETSI TS 101 851-2-1 V2.1.1 (2008-01)
4.2.9 Insertion of discontinuous transmission (DTX) indication bits .43
st
4.2.9.1 1 insertion of DTX indication bits.43
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 .45
4.2.10.2 Relation between input and output of the physical segmentation block in downlink .45
nd
4.2.11 2 interleaving.45
4.2.12 Physical channel mapping.46
4.2.12.1 Uplink.46
4.2.12.2 Downlink.46
4.2.13 Restrictions on different types of CCTrCHs.47
4.2.13.1 Uplink Dedicated channel (DCH) .47
4.2.13.2 Random Access CHannel (RACH) .47
4.2.13.3 Downlink Dedicated CHannel (DCH) .48
4.2.13.4 Broadcast channel (BCH) .48
4.2.13.5 Forward access and paging channels (FACH and PCH).48
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 .49
4.2.14.1.1 Allowed CCTrCH combinations on the uplink .49
4.2.14.1.2 Allowed CCTrCH combinations on the downlink .49
4.3 Transport format detection .49
4.3.1 Blind transport format detection .50
4.3.2 Single transport format detection.50
4.3.3 Transport format detection based on TFCI.50
4.3.4 Coding of Transport-Format-Combination Indicator (TFCI) .51
4.3.5 Mapping of TFCI words .52
4.3.5.1 Mapping of TFCI word in normal mode .52
4.3.5.2 Mapping of TFCI word in compressed mode .52
4.3.5.2.1 Uplink compressed mode.52
4.3.5.2.2 Downlink compressed mode.53
4.4 Compressed mode .53
4.4.1 Frame structure in the uplink .54
4.4.2 Frame structure types in the downlink.54
4.4.3 Transmission time reduction method.54
4.4.3.1 Compressed mode by puncturing.54
4.4.3.2 Compressed mode by reducing the spreading factor by 2.54
4.4.3.3 Compressed mode by higher layer scheduling.54
4.4.4 Transmission gap position.55
Annex A (informative): Blind transport format detection.57
A.1 Blind transport format detection using fixed positions .57
A.1.1 Blind transport format detection using received power ratio.57
A.1.2 Blind transport format detection using CRC .57
Annex B (informative): Compressed mode idle lengths.60
B.1 Idle lengths for DL, UL and DL+UL compressed mode.60
History .62

ETSI

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5 ETSI TS 101 851-2-1 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 G at ITU-R, in the frame of
the modification of ITU-R Recommendation M.1457 [10]. This modification has been approved at SG8 meeting in
November 2005.
The present document is part 2, sub-part 1 of a multi-part deliverable covering Satellite Earth Stations and Systems
(SES); Satellite Component of UMTS/IMT-2000; G-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.
ETSI

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6 ETSI TS 101 851-2-1 V2.1.1 (2008-01)
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.
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, etc.) denotes the family of S-UMTS specifications.
An 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.
EXAMPLE: An S-UMTS specification may contain specific references to the corresponding 3GPP
specification.
• If an 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 101 851-2-1 V2.1.1 (2008-01)
1 Scope
The present document describes the characteristics of the Layer 1 multiplexing and channel coding used for family G of
the satellite component of UMTS (S-UMTS-G).
It is based on the FDD mode of UTRA defined by TS 125 211 [6], TS 125 212 [7], TS 125 213 [8] and TS 125 214 [9]
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 101 851-1-1: "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 1: G-family (S-UMTS-G 25.211)".
[2] ETSI TS 101 851-3-1: "Satellite Earth Stations and Systems (SES); Satellite Component of
UMTS/IMT-2000; Part 3: Spreading and modulation; Sub-part 1: G-family (S-UMTS-G 25.213)".
[3] ETSI TS 101 851-4-1: "Satellite Earth Stations and Systems (SES); Satellite Component of
UMTS/IMT-2000; Part 4: Physical layer procedures; Sub-part 1: G-family (S-UMTS-G 25.214)".
[4] ETSI TS 125 302: "Universal Mobile Telecommunications System (UMTS); Services provided by
the physical layer (3GPP TS 25.302)".
[5] ETSI TS 125 215: "Universal Mobile Telecommunications System (UMTS); Physical layer;
Measurements (FDD) (3GPP TS 25.215)".
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8 ETSI TS 101 851-2-1 V2.1.1 (2008-01)
2.2 Informative references
[6] ETSI TS 125 211: "Universal Mobile Telecommunications System (UMTS); Physical channels
and mapping of transport channels onto physical channels (FDD) (3GPP TS 25.211)".
[7] ETSI TS 125 212: "Universal Mobile Telecommunications System (UMTS); Multiplexing and
channel coding (FDD) (3GPP TS 25.212)".
[8] ETSI TS 125 213: "Universal Mobile Telecommunications System (UMTS); Spreading and
modulation (FDD) (3GPP TS 25.213)".
[9] ETSI TS 125 214: "Universal Mobile Telecommunications System (UMTS); Physical layer
procedures (FDD) (3GPP TS 25.214)".
[10] 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
NOTE: 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
NOTE: The CFNs of the radio frames containing the first empty slot of the transmission gaps, the CFNs of the
radio frames containing the last empty slot, the respective positions N and N within these frames of
first last
the first and last empty slots of the transmission gaps, and the transmission gap lengths can be calculated
with the compressed mode parameters described in TS 125 215 [5].
TrCH number: transport channel number which identifies a TrCH in the context of L1
NOTE: The L3 transport channel identity (TrCH ID) maps onto the L1 transport channel number. The mapping
between the transport channel number and the TrCH ID is as follows: TrCH 1 corresponds to the TrCH
with the lowest TrCH ID, TrCH 2 corresponds to the TrCH with the next lowest TrCH ID and so on.
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
1; x ≥ 0
⎧
sgn(x) signum function, i.e. sgn(x) =
⎨
−1; x < 0
⎩
N The first slot in the TG, located in the first compressed radio frame if the TG spans two frames.
first
N The last slot in the TG, located in the second compressed radio frame if the TG spans two frames.
last
N Number of transmitted slots in a radio frame.
tr
Unless otherwise is explicitly stated when the symbol is used, the meaning of the following symbols is:
i TrCH number
j TFC number
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9 ETSI TS 101 851-2-1 V2.1.1 (2008-01)
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
N Number of data bits that are available for the CCTrCH in a radio frame with TFC j
data,j
cm
N Number of data bits that are available for the CCTrCH in a compressed radio frame with TFC j
data, j
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 clauses with different meaning.
x, X
y, Y
z, Z
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
CFN Connection Frame Number
CRC Cyclic Redundancy Check
DCH Dedicated CHannel
DL DownLink (Forward link)
DPCCH Dedicated Physical Control CHannel
DPCH Dedicated Physical CHannel
DPDCH Dedicated Physical Data CHannel
DTX Discontinuous Transmission
FACH Forward Access CHannel
FDD Frequency Division Duplex
FER Frame Error Rate
GEO Geostationary Earth Orbit
GF Galois Field
LEO Low Earth Orbit
MAC Medium Access Control
MEO Medium Earth Orbit
MSS Mobile Satellite Services
PCCC Parallel Concatenated Convolutional Code
PCH Paging CHannel
PhCH Physical CHannel
PRACH Physical Random Access CHannel
RACH Random Access CHannel
S-CCPCH Secondary Common Control Physical CHannel
SF Spreading Factor
S-UMTS Satellite Universal Mobile Telecommunication Systems
TF Transport Format
TFC Transport Format Combination
TFCI Transport Format Combination Indicator
TG Transmission Gap
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10 ETSI TS 101 851-2-1 V2.1.1 (2008-01)
TGL Transmission Gap Length
TPC Transmit Power Control
TrCH Transport CHannel
TTI Transmission Time Interval
UL UpLink (Reverse link)
USRAN UMTS Satellite Radio Access Network
UTRA UMTS Terrestrial Radio Access
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 General coding/multiplexing of TrCHs
This clause only applies to the transport channels:
• DCH;
• RACH;
• BCH;
• FACH; and
• PCH.
Other transport channe
...