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

ETSI TS 101 851-1-2 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 2: A-family (S-UMTS-A 25.211)

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



Reference
RTS/SES-00298-1-2
Keywords
MES, MSS, satellite, UMTS
ETSI
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ETSI

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3 ETSI TS 101 851-1-2 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 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 DCH - Dedicated Channel .9
4.1.2 Common transport channels .9
4.1.2.1 BCH - Broadcast Channel.9
4.1.2.2 FACH - Forward Access Channel.9
4.1.2.3 PCH - Paging Channel .9
4.1.2.4 RACH - Random Access Channel .9
4.1.2.5 CPCH – Common Packet Channel.9
4.1.2.6 DSCH – Downlink Shared Channel.9
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 .12
5.2.2.1 Physical Random Access Channel (PRACH) .12
5.2.2.1.1 Overall structure of random-access transmission .12
5.2.2.1.2 RACH preamble part.12
5.2.2.1.3 RACH message part .13
5.2.2.2 Physical Common Packet Channel (PCPCH) .14
5.3 Downlink physical channels.14
5.3.1 Downlink transmit diversity .14
5.3.2 Dedicated downlink physical channels.14
5.3.2.1 STTD for DPCH .17
5.3.2.2 Dedicated channel pilots with closed loop mode transmit diversity .17
5.3.2.3 DL-DPCCH for CPCH.17
5.3.3 Common downlink physical channels .17
5.3.3.1 Common Pilot Channel (CPICH).17
5.3.3.1.1 Primary Common Pilot Channel.18
5.3.3.1.2 Secondary Common Pilot Channel.18
5.3.3.2 Primary Common Control Physical Channel (P-CCPCH).18
5.3.3.2.1 Primary CCPCH structure with STTD encoding.19
5.3.3.3 Secondary Common Control Physical Channel (S-CCPCH) .19
5.3.3.3.1 Secondary CCPCH structure with STTD encoding.21
5.3.3.4 Synchronization Channel (SCH).21
5.3.3.4.1 SCH transmitted by TSTD .21
5.3.3.5 Physical Downlink Shared Channel (PDSCH).21
5.3.3.6 Acquisition Indicator Channel (AICH) .22
5.3.3.7 CPCH Access Preamble Acquisition Indicator Channel (AP-AICH) .22
5.3.3.8 CPCH Collision Detection/Channel Assignment Indicator Channel (CD/CA-ICH) .22
5.3.3.9 Page Indication Channel (PICH).23
5.3.3.10 CPCH Status Indicator Channel (CSICH).23
5.3.3.11 High Penetration Page Indication Channel (HPPICH).23
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4 ETSI TS 101 851-1-2 V2.1.1 (2008-01)
6 Mapping and association of physical channels .24
6.1 Mapping of transport channels onto physical channels.24
7 Timing relationship between physical channels.24
7.1 General.24
7.2 PICH/S-CCPCH timing relation.25
7.3 PRACH/AICH timing relation .26
7.4 PCPCH/AICH timing relation.26
7.5 DPCH/PDSCH timing.26
7.6 DPCCH/DPDCH timing relations.26
7.6.1 Uplink.26
7.6.2 Downlink.26
7.6.3 Uplink/downlink timing at UE.27
7.7 Timing relations for initialization of channels.27
History .29

ETSI

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5 ETSI TS 101 851-1-2 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 [9].
The present document is part 1, 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";
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 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 101 851-1-2 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.
ETSI

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7 ETSI TS 101 851-1-2 V2.1.1 (2008-01)
1 Scope
The present document defines the Layer 1 transport channels and physical channels 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 [4], TS 125 212 [5], TS 125 213 [6], TS 125 214 [7] 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 101 851-2-2: "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)".
[2] ETSI TS 101 851-3-2: "Satellite Earth Stations and Systems (SES); Satellite Component of
UMTS/IMT-2000; Part 3: Spreading and modulation; Sub-part 2: A-family (S-UMTS-A 25.213)".
[3] ETSI TS 101 851-4-2: "Satellite Earth Stations and Systems (SES); Satellite Component of
UMTS/IMT-2000; Part 4: Physical layer procedures; Sub-part 2: A-family (S-UMTS-A 25.214)".
[4] 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)".
[5] ETSI TS 125 212: "Universal Mobile Telecommunications System (UMTS); Multiplexing and
channel coding (FDD) (3G TS 25.212 version 3.3.0 Release 1999)".
[6] ETSI TS 125 213: "Universal Mobile Telecommunications System (UMTS); Spreading and
modulation (FDD) (3G TS 25.213 version 3.3.0 Release 1999)".
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8 ETSI TS 101 851-1-2 V2.1.1 (2008-01)
[7] ETSI TS 125 214: "Universal Mobile Telecommunications System (UMTS); Physical layer
procedures (FDD) (3G TS 25.214 version 3.3.0 Release 1999)".
[8] 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)".
2.2 Informative references
[9] ITU-R Recommendation M.1457 (2006): "Detailed specifications of the radio interfaces of
International Mobile Telecommunications-2000 (IMT-2000)".
3 Abbreviations
For the purposes of the present document, the following abbreviations apply:
3GPP Third Generation Partnership Project
AP Access Preamble
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
DSCH Downlink Shared Channel
DTX Discontinuous Transmission
FACH Forward Access Channel
FSW Frame Synchronization Word
GEO Geostationary Orbit
HPPICH High Penetration Page Indicator Channel
ICH Indicator Channel
LEO Low Earth Orbit
MEO Medium Earth Orbit
PCH Paging Channel
P-CCPCH Primary Common Control Physical Channel
PCPCH Physical Common Packet Channel
PDSCH Physical Downlink Shared Channel
PI Page Indicator
PICH Page Indication 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
SFN System Frame Number
TFCI Transport Format Combination Indicator
TPC Transmit Power Control
UE User Equipment
USRAN UMTS Satellite Radio Access Network
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9 ETSI TS 101 851-1-2 V2.1.1 (2008-01)
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 [8].
A transport channel is defined by how and with what characteristics data are 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 DCH - Dedicated Channel
The Dedicated Channel (DCH) is a downlink or uplink transport channel. The DCH is transmitted over the entire cell or
over only a part of the cell using e.g. beam-forming antennas.
4.1.2 Common transport channels
There are six types of common transport channels: BCH, FACH, PCH, RACH, CPCH and DSCH.
4.1.2.1 BCH - Broadcast Channel
The Broadcast Channel (BCH) is a downlink transport channel that is used to broadcast system and cell-specific
information. The BCH is always transmitted over the entire cell and has a single transport format.
4.1.2.2 FACH - Forward Access Channel
The Forward Access Channel (FACH) is a downlink transport channel. The FACH is transmitted over the entire cell or
over only a part of the cell using e.g. beam-forming antennas. The FACH can be transmitted using slow power control.
4.1.2.3 PCH - Paging Channel
The Paging Channel (PCH) is a downlink transport channel. The PCH is always transmitted over the entire cell. The
transmission of the PCH is associated with the transmission of physical-layer generated Paging Indicators, to support
efficient sleep-mode procedures.
4.1.2.4 RACH - Random Access Channel
The Random Access Channel (RACH) is an uplink transport channel. The RACH is always received from the entire
cell. The RACH is characterized by a collision risk and by being transmitted using open loop power control.
4.1.2.5 CPCH – Common Packet Channel
This channel is not used in S-UMTS-A.
4.1.2.6 DSCH – Downlink Shared Channel
The Downlink Shared Channel (DSCH) is a downlink transport channel shared by several UE. The DSCH is associated
with one or several downlink DCH. The DSCH is transmitted over the entire cell or over only a part of the cell using
e.g. beam-forming antennas.
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10 ETSI TS 101 851-1-2 V2.1.1 (2008-01)
4.2 Indicators
Indicators are means of fast low-level signalling entities that are transmitted without using information blocks sent over
transport channels. The meaning of indicators is implicit to the receiver.
The indicators defined in the current version of the specifications are: Page Indicator (PI).
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 & stop (giving a duration) and, on the uplink, relative phase (0 or π/2). Scrambling and channelization codes are
specified in TS 101 851-3-2 [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 two types of uplink dedicated physical channels, the uplink Dedicated Physical Data Channel (uplink
DPDCH) and the uplink Dedicated Physical Control Channel (uplink DPCCH).
The DPDCH and the DPCCH are I/Q code multiplexed within each radio frame (see TS 101 851-3-2 [2]).
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 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 dedicated physical channels. 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.
slot
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11 ETSI TS 101 851-1-2 V2.1.1 (2008-01)

Data
DPDCH
N bits
data
k
T = 2 560 chips, N = 10 x 2 bits (k=0.6)
slot data
TFCI/TPC
Pilot
DPCCH
N bits
N bits TFCI/TPC
pilot
T = 2 560 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 and N ) is given
pilot TFCI/TPC
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 table 3. The TFCI/TPC bit pattern is described in TS 101 851-2-2 [1].
Table 1: DPDCH fields
Slot Format #i Channel Bit Rate Channel Symbol Rate SF Bits/Frame Bits/Slot N
data
(kbps) (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 101 851-2-2 [1].
In compressed mode, DPCCH slot formats with TFCI fields are changed.
Table 2: DPCCH fields
Slot Channel Bit Rate Channel Symbol SF Bits/ Bits/ N N Transmitted slots
pilot TFCI/TPC
Format (kbps) Rate (ksps) Frame Slot per radio frame
#i
0 15 15 256 150 10 8 2 8-15

The pilot bit patterns are described in table 3. The shadowed column part of pilot bit pattern is defined as FSW and
FSWs can be used
...