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

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


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)

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



Reference
RTS/SES-00298-1-1
Keywords
interface, MES, MSS, radio, satellite, UMTS
ETSI
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ETSI

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3 ETSI TS 101 851-1-1 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 Symbols and abbreviations.8
3.1 Symbols.8
3.2 Abbreviations.8
4 Services offered to higher layers.9
4.1 Transport channels.9
4.1.1 Dedicated transport channels .9
4.1.1.1 Dedicated CHannel (DCH) .9
4.1.2 Common transport channels .9
4.1.2.1 Broadcast CHannel (BCH).9
4.1.2.2 Forward Access CHannel (FACH) .9
4.1.2.3 Paging CHannel (PCH).9
4.1.2.4 Random Access CHannel (RACH) .10
4.2 Indicators.10
5 Physical channels and physical signals .10
5.1 Physical signals.10
5.2 Uplink physical channels.10
5.2.1 Dedicated uplink physical channels.10
5.2.2 Common uplink physical channels .13
5.2.2.1 Physical Random Access CHannel (PRACH) .13
5.2.2.1.1 Overall structure of random-access transmission .13
5.2.2.1.2 RACH preamble part.14
5.2.2.1.3 RACH message part .14
5.3 Downlink physical channels.16
5.3.1 Dedicated downlink physical channels.16
5.3.2 Common downlink physical channels .20
5.3.2.1 Common PIlot CHannel (CPICH).20
5.3.2.1.1 Primary Common PIlot CHannel (P-CPICH).20
5.3.2.1.2 Secondary Common PIlot CHannel (S-CPICH).20
5.3.2.2 Downlink phase reference.21
5.3.2.3 Primary Common Control Physical CHannel (P-CCPCH) .21
5.3.2.4 Secondary Common Control Physical CHannel (S-CCPCH) .21
5.3.2.5 Synchronization CHannel (SCH).23
5.3.2.6 Acquisition Indicator CHannel (AICH) .24
5.3.2.7 Paging Indicator CHannel (PICH) .25
5.3.2.8 MBMS Indicator CHannel (MICH) .26
6 Mapping and association of physical channels .27
6.1 Mapping of transport channels onto physical channels.27
6.2 Association of physical channels and physical signals.27
7 Timing relationship between physical channels.27
7.1 General.27
7.2 PICH/S-CCPCH timing relation.28
7.3 PRACH/AICH timing relation .29
7.4 DPCCH/DPDCH timing relations.30
7.4.1 Uplink.30
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4 ETSI TS 101 851-1-1 V2.1.1 (2008-01)
7.4.2 Downlink.30
7.4.3 Uplink/downlink timing at UE.30
7.5 MICH/S-CCPCH timing relation .30
History .31

ETSI

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5 ETSI TS 101 851-1-1 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 [9]. This modification has been approved at ITU-R SG8 meeting
in November 2005.
The present document is part 1, 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";
Sub-part 1: "G-family (S-UMTS-G 25.211)";
Sub-part 2: "A-family (S-UMTS-A 25.211)";
Part 2: "Multiplexing and channel coding";
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
geostationary (GEO), or low (LEO) or medium (MEO) earth orbiting 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 101 851-1-1 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, 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 101 851-1-1 V2.1.1 (2008-01)
1 Scope
The present document defines the Layer 1 transport channels and physical channels 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 125 201 [4], TS 125 211 [8], TS 125 302 [5] and TS 125 435 [6]
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 101 851-2-1: "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)".
[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 125 201: "Universal Mobile Telecommunications System (UMTS); Physical layer -
general description (3GPP TS 25.201)".
[5] ETSI TS 125 302: "Universal Mobile Telecommunications System (UMTS); Services provided by
the physical layer (3GPP TS 25.302)".
[6] ETSI TS 125 435: "Universal Mobile Telecommunications System (UMTS); UTRAN Iub
interface user plane protocols for Common Transport Channel data streams (3GPP TS 25.435)".
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8 ETSI TS 101 851-1-1 V2.1.1 (2008-01)
[7] ETSI TS 125 427: "Universal Mobile Telecommunications System (UMTS); UTRAN Iur/Iub
interface user plane protocol for DCH data streams (3GPP TS 25.427)".
2.2 Informative references
[8] ETSI TS 125 211: "Universal Mobile Telecommunications System (UMTS); Physical channels
and mapping of transport channels onto physical channels (FDD) (3GPP TS 25.211)".
[9] ITU-R Recommendation M.1457 (2006): "Detailed specifications of the radio interfaces of
International Mobile Telecommunications-2000 (IMT-2000)".
3 Symbols and abbreviations
3.1 Symbols
For the purposes of the present document, the following symbols apply:
N The number of data bits per downlink slot in Data1 field
data1
N The number of data bits per downlink slot in Data2 field (If the slot format does not contain a
data2
Data2 field, N = 0)
data2
3.2 Abbreviations
For the purposes of the present document, the following abbreviations apply:
AI Acquisition Indicator
AS Access Slot
AICH Acquisition Indicator CHannel
BCH Broadcast CHannel
CCPCH Common Control Physical CHannel
CCTrCH Coded Composite Transport CHannel
CPICH Common PIlot CHannel
DCH Dedicated CHannel
DPCCH Dedicated Physical Control CHannel
DPCH Dedicated Physical CHannel
DPDCH Dedicated Physical Data CHannel
DTX Discontinuous Transmission
FACH Forward Access CHannel
FBI FeedBack Information
FSW Frame Synchronization Word
GEO Geostationary Earth Orbit
ICH Indicator CHannel
LEO Low Earth Orbit
MEO Medium Earth Orbit
MICH MBMS Indicator CHannel
MSS Mobile Satellite Services
NI MBMS Notification Indicator
P-CCPCH Primary Common Control Physical CHannel
PCH Paging CHannel
PI Page Indicator
PICH Page Indicator CHannel
PRACH Physical Random Access CHannel
PSC Primary Synchronization Code
RACH Random Access CHannel
S-CCPCH Secondary Common Control Physical CHannel
SCH Synchronization CHannel
SF Spreading Factor
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9 ETSI TS 101 851-1-1 V2.1.1 (2008-01)
SFN System Frame Number
SSC Secondary Synchronization Code
TFCI Transport Format Combination Indicator
TPC Transmit Power Control
UE User Equipment
USRAN UMTS Satellite Radio Access Network
4 Services offered to higher layers
4.1 Transport channels
Transport channels are services offered by Layer 1 to the higher layers. General concepts about transport channels are
described in TS 125 302 [5].
A transport channel is defined by how and with what characteristics data is transferred over the air interface. A general
classification of transport channels is into two groups:
- dedicated channels, using inherent addressing of UE;
- common channels, using explicit addressing of UE if addressing is needed.
4.1.1 Dedicated transport channels
There exists only one type of dedicated transport channel, the Dedicated CHannel (DCH).
4.1.1.1 Dedicated CHannel (DCH)
The Dedicated CHannel (DCH) is a downlink or uplink transport channel. The DCH is transmitted over the entire spot
or over only a part of the spot using e.g. beam-forming antennas.
4.1.2 Common transport channels
There are four types of common transport channels:
• BCH;
• FACH;
• PCH; and
• RACH.
4.1.2.1 Broadcast CHannel (BCH)
The Broadcast CHannel (BCH) is a downlink transport channel that is used to broadcast system- and spot-specific
information. The BCH is always transmitted over the entire spot and has a single transport format.
4.1.2.2 Forward Access CHannel (FACH)
The Forward Access CHannel (FACH) is a downlink transport channel. The FACH is transmitted over the entire spot.
The FACH can be transmitted using power setting described in TS 125 435 [6], i.e. with "Transmit Power Level" of the
"FACH DATA FRAME" Frame Protocol message.
4.1.2.3 Paging CHannel (PCH)
The Paging CHannel (PCH) is a downlink transport channel. The PCH is always transmitted over the entire spot. The
transmission of the PCH is associated with the transmission of physical-layer generated Paging Indicators, to support
efficient sleep-mode procedures.
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10 ETSI TS 101 851-1-1 V2.1.1 (2008-01)
4.1.2.4 Random Access CHannel (RACH)
The Random Access CHannel (RACH) is an uplink transport channel. The RACH is always received from the entire
spot. The RACH is characterized by a collision risk and by being transmitted using open loop power control.
4.2 Indicators
Indicators are means of fast low-level signalling entities which are transmitted without using information blocks sent
over transport channels. The meaning of indicators is specific to the type of indicator.
The indicators defined in the current version of the specifications are:
• Acquisition Indicator (AI);
• Page Indicator (PI); and
• MBMS Notification Indicator (NI).
Indicators may be either boolean (two-valued) or three-valued. Their mapping to indicator channels is channel specific.
Indicators are transmitted on those physical channels that are Indicator CHannels (ICH).
5 Physical channels and physical signals
Physical channels are defined by a specific carrier frequency, scrambling code, channelization code (optional), time
start and stop (giving a duration) and, on the uplink, relative phase (0 or π/2). Scrambling and channelization codes are
specified in TS 101 851-3-1 [2]. Time durations are defined by start and stop instants, measured in integer multiples of
chips. Suitable multiples of chips also used in specification are:
Radio frame: A radio frame is a processing duration which consists of 15 slots. The length of a radio
frame corresponds to 38 400 chips.
Slot: A slot is a duration which consists of fields containing bits. The length of a slot corresponds
to 2 560 chips.
The default time duration for a physical channel is continuous from the instant when it is started to the instant when it is
stopped. Physical channels that are not continuous will be explicitly described.
Transport channels are described (in more abstract higher layer models of the physical layer) as being capable of being
mapped to physical channels. Within the physical layer itself the exact mapping is from a Composite Coded Transport
CHannel (CCTrCH) to the data part of a physical channel. In addition to data parts there also exist channel control parts
and physical signals.
5.1 Physical signals
Physical signals are entities with the same basic on-air attributes as physical channels but do not have transport channels
or indicators mapped to them. Physical signals may be associated with physical channels in order to support the
function of physical channels.
5.2 Uplink physical channels
5.2.1 Dedicated uplink physical channels
There are three types of uplink dedicated physical channels, the uplink Dedicated Physical Data CHannel (uplink
DPDCH) and the uplink Dedicated Physical Control CHannel (uplink DPCCH).
The DPDCHand DPCCH are I/Q code multiplexed (see TS 101 851-3-1 [2]).
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11 ETSI TS 101 851-1-1 V2.1.1 (2008-01)
The uplink DPDCH is used to carry the DCH transport channel. There may be zero, one, or several uplink DPDCHs on
each radio link.
The uplink DPCCH is used to carry control information generated at Layer 1. The Layer 1 control information consists
of known pilot bits to support channel estimation for coherent detection, Transmit Power-Control (TPC) commands,
FeedBack Information (FBI), and an optional Transport-Format Combination Indicator (TFCI). The transport-format
combination indicator informs the receiver about the instantaneous transport format combination of the transport
channels mapped to the simultaneously transmitted uplink DPDCH radio frame. There is one and only one uplink
DPCCH on each radio link.
Figure 1 shows the frame structure of the uplink DPDCH and the uplink DPCCH. Each radio frame of length 10 ms is
split into 15 slots, each of length T = 2 560 chips, corresponding to one power-control period. The DPDCH and
slot
DPCCH are always frame aligned with each other.
Data
DPDCH
N bits
data
k
T = 2560 chips, N = 10*2 bits (k=0.6)
slot data
FBI TPC
Pilot TFCI
DPCCH
N bits N bits
N bits N bits FBI TPC
pilot TFCI
T = 2560 chips, 10 bits
slot
Slot #0 Slot #1 Slot #i Slot #14
1 radio frame: T = 10 ms
f

Figure 1: Frame structure for uplink DPDCH/DPCCH
The parameter k in figure 1 determines the number of bits per uplink DPDCH slot. It is related to the spreading factor
k
SF of the DPDCH as SF = 256 / 2 . The DPDCH spreading factor may range from 256 down to 4. The spreading factor
of the uplink DPCCH is always equal to 256, i.e. there are 10 bits per uplink DPCCH slot.
The exact number of bits of the uplink DPDCH and the different uplink DPCCH fields (N , N , N and N )
pilot TFCI FBI TPC
is given by tables 1 and 2. What slot format to use is configured by higher layers and can also be reconfigured by higher
layers.
The channel bit and symbol rates given in tables 1 and 2 are the rates immediately before spreading. The pilot patterns
are given in tables 3 and 4, the TPC bit pattern is given in table 5.
The FBI bits are used to support techniques requiring feedback from the UE to the USRAN Access Point, including
Spot Selection Diversity Transmission (SSDT). The structure of the FBI field is shown in figure 2 and described below.
S field
N
FBI

Figure 2: FBI field
The S field is used for SSDT signalling. It consists of 0 bit, 1 bit or 2 bits. The total FBI field size N is given by table
FBI
2. If total FBI field is not filled with S field, FBI field shall be filled with "1". The use of the FBI fields is described in
detail in TS 101 851-4-1 [3].
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12 ETSI TS 101 851-1-1 V2.1.1 (2008-01)
Table 1: DPDCH fields
Slot Format #i Channel Bit Rate Channel Symbol SF Bits/Frame Bits/Slot N
data
(kbps) Rate (ksps)
0 15 15 256 150 10 10
1 30 30 128 300 20 20
2 60 60 64 600 40 40
3 120 120 32 1 200 80 80
4 240 240 16 2 400 160 160
5 480 480 8 4 800 320 320
6 960 960 4 9 600 640 640

There are two types of uplink dedicated physical channels; those that include TFCI (e.g. for several simultaneous
services) and those that do not include TFCI (e.g. for fixed-rate services). These types are reflected by the duplicated
rows of table 2. It is the USRAN that determines if a TFCI should be transmitted and it is mandatory for all UEs to
support the use of TFCI in the uplink. The mapping of TFCI bits onto slots is described in TS 101 851-2-1 [1].
In compressed mode, DPCCH slot formats with TFCI fields are changed. There are two possible compressed slot
formats for each normal slot format. They are labelled A and B and the selection between them is dependent on the
number of slots that are transmitted in each frame in compressed mode.
Table 2: DPCCH fields
Slot Channel Bit Channel SF Bits/ Bits/ N N N N Transmitted
pilot TPC TFCI FBI
Format Rate (kbps) Symbol Rate Frame Slot slots per radio
#i (ksps) frame
0 15 15 256 150 10 6 2 2 0 15
0A 15 15 256 150 10 5 2 3 0 10 to 14
0B 15 15 256 150 10 4 2 4 0 8 to 9
1 15 15 256 150 10 8 2 0 0 8 to 15
2 15 15 256 150 10 5 2 2 1 15
2A 15 15 256 150 10 4 2 3 1 10 to 14
2B 15 15 256 150 10 3 2 4 1 8 to 9
3 15 15 256 150 10 7 2 0 1 8 to 15
4 15 15 256 150 10 6 2 0 2 8 to 15
5 15 15 256 150 10 5 1 2 2 15
5A 15 15 256 150 10 4 1 3 2 10 to 14
5B 15 15 256 150 10 3 1 4 2 8 to 9

The pilot bit patterns are described in tables 3 and 4. The shadowed column part of pilot bit pattern is defined as FSW
and FSWs can be used to confirm frame synchronization. (The value of the pilot bit pattern other than FSWs shall
be "1".)
Table 3: Pilot bit p
...