ETSI TS 101 851-4-3 V3.1.1 (2011-09)

Satellite Earth Stations and Systems (SES); Satellite Component of UMTS/IMT-2000; Part 4: Physical layer procedures; Sub-part 3: G-family enhancements (S-UMTS-G enhanced 25.214)

DTS/SES-00314-4-3

General Information

• Status: Published
• Publication Date: 31-Aug-2011
• Technical Committee: SES MSS - SES WG on Mobile Satellite Systems
• Current Stage: 12 - Completion
• Due Date: 31-Aug-2011
• Completion Date: 01-Sep-2011

Standards Content (Sample)

Technical Specification
Satellite Earth Stations and Systems (SES);
Satellite Component of UMTS/IMT-2000;
Part 4: Physical layer procedures;
Sub-part 3: G-family enhancements
(S-UMTS-G enhanced 25.214)
2 ETSI TS 101 851-4-3 V3.1.1 (2011-09)

Reference
DTS/SES-00314-4-3
Keywords
interface, MES, MSS, radio, satellite, UMTS
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ETSI
3 ETSI TS 101 851-4-3 V3.1.1 (2011-09)
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 and abbreviations . 8
3.1 Definitions . 8
3.2 Abbreviations . 9
4 Synchronization procedures . 10
4.1 Spot search . 10
4.2 Common physical channel synchronization . 10
4.2.1 P-CCPCH radio frame timing . 10
4.2.2 S-CCPCH soft combining timing . 10
4.3 DPCCH/DPDCH synchronization . 10
4.3.1 Synchronization primitives . 10
4.3.1.1 General . 10
4.3.1.2 Downlink synchronization primitives . 11
4.3.1.3 Uplink synchronization primitives . 11
4.3.2 Radio link establishment and physical layer reconfiguration for dedicated channels . 12
4.3.2.1 General . 12
4.3.2.2 Satellite gateway radio link set state machine . 12
4.3.2.3 Synchronization procedure A . 13
4.3.2.4 Synchronization procedure B . 13
4.3.3 Radio link monitoring . 14
4.3.3.1 Downlink radio link failure . 14
4.3.3.2 Uplink radio link failure/restore . 14
4.3.4 Transmission timing adjustments . 14
5 Power control . 15
5.1 Uplink power control. 15
5.1.1 PRACH . 15
5.1.1.1 General . 15
5.1.1.2 Setting of PRACH control and data part power difference . 15
5.1.2 DPCCH/DPDCH . 15
5.1.2.1 General . 15
5.1.2.1.1 Normal operations . 15
5.1.2.1.2 Operations in Optional mode C . 16
5.1.2.2 Ordinary transmit power control . 16
5.1.2.2.1 Normal operation . 16
5.1.2.2.2 Operation in optional mode C . 19
5.1.2.3 Transmit power control in compressed mode . 22
5.1.2.3.1 Normal operation . 22
5.1.2.3.2 Operations in Optional mode C . 24
5.1.2.4 Transmit power control in the uplink DPCCH power control preamble . 25
5.1.2.5 Setting of the uplink DPCCH/DPDCH power difference . 25
5.1.2.5.1 General . 25
5.1.2.5.2 Signalled gain factors . 26
5.1.2.5.3 Computed gain factors . 26
5.1.2.5.4 Setting of the uplink DPCCH/DPDCH power difference in compressed mode . 27
5.1.2.6 Maximum and minimum power limits . 27
5.1.2.6.1 Normal operation . 27
5.1.2.6.2 Operation in Optional mode C . 28
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4 ETSI TS 101 851-4-3 V3.1.1 (2011-09)
5.2 Downlink power control . 28
5.2.1 DPCCH/DPDCH . 28
5.2.1.1 General . 28
5.2.1.2 Ordinary transmit power control . 28
5.2.1.2.1 Normal operations . 28
5.2.1.2.2 Operation in Optional mode C . 30
5.2.1.3 Power control in compressed mode . 32
5.2.1.4 Spot selection diversity transmit power control . 33
5.2.1.4.1 General . 33
5.2.1.4.2 TPC procedure in UE . 34
5.2.1.4.3 Selection of primary spot . 34
5.2.1.4.4 Delivery of primary spot ID . 35
5.2.1.4.5 TPC procedure in the network . 36
5.2.1.5 Open Loop power control . 36
5.2.2 AICH . 36
5.2.3 PICH . 36
5.2.4 S-CCPCH . 37
5.2.5 MICH . 37
6 Random access procedure . 37
6.1 Physical random access procedure . 37
6.1.1 RACH sub-channels . 39
6.1.2 RACH access slot sets . 40
Annex A (informative): Power control . 42
A.1 Downlink power control timing . 42
Annex B (informative): Spot search procedure . 43
Annex C (normative): Description of G-family enhancements . 44
C.1 Definition of the optional modes A and C. 44
C.2 Description of Optional mode A . 44
C.3 Description of Optional mode C . 45
Annex D (informative): Bibliography . 46
Annex E (informative): Change history . 47
E.1 A-family optional features . 47
E.2 C-family optional features . 47
History . 50

ETSI
5 ETSI TS 101 851-4-3 V3.1.1 (2011-09)
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://ipr.etsi.org).
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 [i.5]. This modification has been approved at SG8 meeting in
November 2005.
The present document is part 4, sub-part 3 of a multi-part deliverable covering Satellite Earth Stations and Systems
(SES); Satellite Component of UMTS/IMT-2000; G-family enhancements, as identified below:
Part 1: "Physical channels and mapping of transport channels into physical channels";
Part 2: "Multiplexing and channel coding";
Part 3: "Spreading and modulation";
Part 4: "Physical layer procedures";
Sub-part 1: "G-family (S-UMTS-G 25.214)";
Sub-part 2: "A-family (S-UMTS-A 25.214)";
Sub-part 3: "G-family enhancements (S-UMTS-G enhanced 25.214)";
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.
ETSI
6 ETSI TS 101 851-4-3 V3.1.1 (2011-09)
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.
The present document is part of the S-UMT sub-part 3 specifications. Sub-part 3 specifications are identified in the title
and can also be identified by the specification number:
• Sub-part 1 specifications have a S-UMTS-G prefix in the title and a sub-part number of "1" (TS 101 851-x-1).
• Sub-part 2 specifications have a S-UMTS-A prefix in the title and a sub-part number of "2" (TS 101 851-x-2).
• Sub-part 3 specifications have a S-UMTS-G enhanced prefix in the title and a sub-part number of "3"
(TS 101 851-x-3).
The sub-part 1 specifications introduce the WCDMA satellite radio interface (ITU-R G-family) specifications for the
third generation (3G) wireless communication systems. It is also based on the WCDMA UTRA FDD radio interface
already standardized in 3GPP. Mobile satellite systems intending to use this interface will address user equipment fully
compatible with 3GPP UTRA FDD WCDMA, with adaptation for agility to the Mobile Satellite Service (MSS)
frequency band.
The sub-part 2 specifications introduce the SW-CDMA satellite radio interface (ITU-R A-family) specifications for
third generation (3G) wireless communication systems. SW-CDMA is based on the adaptation to the satellite
environment of terrestrial WCDMA. The intention is to reuse the same core network and reuse the radio interface
specifications for the Is and Cu interface. Only the Uu interface is adapted to the satellite environment. SW-CDMA
operates in FDD mode with RF channel bandwidth of either 2,350 MHz or 4,700 MHz for each transmission direction.
The sub-part 3 specifications introduce the WCDMA satellite radio interface enhancement (G enhance-family). It
considers G-family as radio interface basis, adding option selected enhancing features from ITU-R A and C-family in
order to optimize the radio interface over satellite. It is based on the results of the TR 102 278 [i.6] identifying a way to
achieve harmonization between A, C and G-family satellite radio interfaces for IMT-2000 in ITU-R. The G-family
enhancements made of A, C and G features are described in annex E.
The sub-parts 1 and 2 will be withdrawn if the A and C family will be removed from the satellite radio interface list of
IMT-2000 in ITU-R Recommendation M.1850 [i.7] and then, the sub-part 3 will be revised.
ETSI
7 ETSI TS 101 851-4-3 V3.1.1 (2011-09)
1 Scope
The present document specifies the characteristics of the physical layer procedures used for family G enhanced of the
satellite component of UMTS (S-UMTS-G).
It is based on the FDD mode of UTRA defined by TS 125 211 [4], TS 125 212 [i.1], TS 125 213 [i.2], TS 125 215 [i.3],
TS 125 214 [5], TS 125 331 [i.4] and TS 125 433 [6] and adapted for operation over satellite transponders.
Furthermore, it specifies enhancing features optimizing the basic G family radio interface performances over satellite
and new functions.
2 References
References are either specific (identified by date of publication and/or edition number or version number) or
non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the
reference document (including any amendments) applies.
Referenced documents which are not found to be publicly available in the expected location might be found at
http://docbox.etsi.org/Reference.
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 necessary for the application of the present document.
[1] ETSI TS 101 851-1-3: "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 3: G-family enhancements (S-UMTS-G enhanced 25.211)".
[2] ETSI TS 101 851-2-3: "Satellite Earth Stations and Systems (SES); Satellite Component of
UMTS/IMT-2000; Part 2: Multiplexing and channel coding; Sub-part 3: G-family enhancements
(S-UMTS-G enhanced 25.212)".
[3] ETSI TS 101 851-3-3: "Satellite Earth Stations and Systems (SES); Satellite Component of
UMTS/IMT-2000; Part 3: Spreading and modulation; Sub-part 3: G-family enhancements
(S-UMTS-G enhanced 25.213)".
[4] ETSI TS 125 211: "Universal Mobile Telecommunications System (UMTS); Physical channels
and mapping of transport channels onto physical channels (FDD) (3GPP TS 25.211)".
[5] ETSI TS 125 214: "Universal Mobile Telecommunications System (UMTS); Physical layer
procedures (FDD) (3GPP TS 25.214)".
[6] ETSI TS 125 433: "Universal Mobile Telecommunications System (UMTS); UTRAN Iub
interface Node B Application Part (NBAP) signalling (3GPP TS 25.433)".
[7] ETSI TS 125 101: "Universal Mobile Telecommunications System (UMTS); User Equipment
(UE) radio transmission and reception (FDD) (3GPP TS 25.101)".
[8] ETSI TS 125 133: "Universal Mobile Telecommunications System (UMTS); Requirements for
support of radio resource management (FDD) (3GPP TS 25.133)".
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8 ETSI TS 101 851-4-3 V3.1.1 (2011-09)
2.2 Informative references
The following referenced documents are not necessary for the application of the present document but they assist the
user with regard to a particular subject area.
[i.1] ETSI TS 125 212: "Universal Mobile Telecommunications System (UMTS); Multiplexing and
channel coding (FDD) (3GPP TS 25.212)".
[i.2] ETSI TS 125 213: "Universal Mobile Telecommunications System (UMTS); Spreading and
modulation (FDD) (3GPP TS 25.213)".
[i.3] ETSI TS 125 215: "Universal Mobile Telecommunications System (UMTS); Physical layer;
Measurements (FDD) (3GPP TS 25.215)".
[i.4] ETSI TS 125 331: "Universal Mobile Telecommunications System (UMTS); Radio Resource
Control (RRC); Protocol specification (3GPP TS 25.331)".
[i.5] ITU-R Recommendation M.1457 (2006): "Detailed specifications of the radio interfaces of
International Mobile Telecommunications-2000 (IMT-2000)".
[i.6] ETSI TR 102 278: "Satellite Earth Stations and Systems (SES); Satellite Component of
UMTS/IMT-2000; Considerations on possible harmonization between A, C and G family Satellite
Radio Interface features".
[i.7] ITU-R Recommendation M.1850: "Detailed specifications of the radio interfaces for the satellite
component of International Mobile Telecommunications-2000 (IMT-2000)".
[i.8] 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)".
[i.9] 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)".
[i.10] 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)".
[i.11] 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)".
[i.12] 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)".
[i.13] 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)".
[i.14] 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)".
[i.15] 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)".
3 Definitions and abbreviations
3.1 Definitions
For the purposes of the present document, the following terms and definitions apply:
L1 combining period: interval of contiguous radio frames when S-CCPCH clusters may be soft combined
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9 ETSI TS 101 851-4-3 V3.1.1 (2011-09)
S-CCPCH cluster: one or more S-CCPCHs on different RLs, all containing identical physical channel bits
NOTE: S-CCPCHs in an S-CCPCH cluster are synchronized such that the delay between the earliest and latest
arriving S-CCPCH at the UE is no more than 296 chips.
3.2 Abbreviations
For the purposes of the present document, the following abbreviations apply:
3GPP 3rd Generation Partnership Project
AI Acquisition Indicator
AICH Acquisition Indicator CHannel
ASC Access Service Class
BCH Broadcast CHannel
BPSK Binary Phase Shift Keying
BSDT Beam Selection Diversity Transmission
CCPCH Common Control Physical CHannel
CCTrCH Coded Composite Transport CHannel
CFN Connection Frame Number
CLPC Closed Loop Power Control
CPICH Common PIlot CHannel
CRC Cyclic Redundancy Check
DL DownLink
DPCCH Dedicated Physical Control CHannel
DPCH Dedicated Physical CHannel
DPDCH Dedicated Physical Data CHannel
DTX Discontinuous Transmission
FBI FeedBack Indicator
FDD Frequency Division Duplexing
GEO Geostationary Earth Orbit
HPPICH High Penetration Paging Indicator CHannel
ID Identity
ISCP Interference on Signal Code Power
ITP Initial Transmit Power mode
LEO Low Earth Orbit
MAC Medium Access Control
MEO Medium Earth Orbit
MICH MBMS Indicator Channel
ML Maximum Likelihood
MSS Mobile Satellite Services
OLPC Open Loop Power Control
PCA Power Control Algorithm
P-CCPCH Primary Common Control Physical CHannel
P-CPICH Primary Common PIlot CHannel
PICH Paging Indicator CHannel
PRACH Physical Random Access CHannel
RACH Random Access CHannel
RAT Radio Access Technology
RF Radio Frequency
RF Radio Frequency
RL Radio Link
RPL Recovery Period Length
RPP Recovery Period Power control
RRC Radio Resource Control
RSCP Received Signal Code Power
S-CCPCH Secondary Common Control Physical CHannel
SCH Synchronization CHannel
SFN System Frame Number
SIR Signal-to-Interference Ratio
SSDT Site Selection Diversity Transmission
S-UMTS Satellite Universal Mobile Telecommunication System
ETSI
10 ETSI TS 101 851-4-3 V3.1.1 (2011-09)
SW-CDMA Satellite Wideband Code Division Multiple Access
TFC Transport Format Combination
TFCI Transport Frame Combination Indicator
TPC Transmit Power Control
TrCH Transport CHannel
TTI Transmission Time Interval
T-UMTS Terrestrial Universal Mobile Telecommunication System
TX Transmission
UE User Equipment
UL UpLink
USRAN UMTS Satellite Radio Access Network
UTRA UMTS Terrestrial Radio Access
UW Unique Word
WCDMA Wideband Code Division Multiple Access
4 Synchronization procedures
4.1 Spot search
During the spot search, the UE searches for a satellite beam and determines the downlink scrambling code and common
channel frame synchronization of that satellite beam. How spot search is typically done is described in annex B.
4.2 Common physical channel synchronization
The radio frame timing of all common physical channels can be determined after spot search.
4.2.1 P-CCPCH radio frame timing
The P-CCPCH radio frame timing is found during spot search and the radio frame timing of all common physical
channel are related to that timing as described in TS 101 851-1-3 [1].
4.2.2 S-CCPCH soft combining timing
Higher layers will provide additional timing information when S-CCPCH clusters can be soft combined. The timing
information allows the UE to determine the L1 combining period that applies to each S-CCPCH cluster. The
information also identifies the S-CCPCHs and the RLs in each cluster as well as which S-CCPCH clusters can be soft
combined. The set of S-CCPCH clusters that can be combined does not change during an L1 combining period. When
S-CCPCH clusters can be soft combined, all S-CCPCHs in the clusters shall contain identical bits in their data fields,
although the TFCI fields of S-CCPCH in different clusters may be different. (TFC detection when S-CCPCH clusters
may be soft combined is discussed in TS 101 851-2-3 [2].) An L1 combining period shall contain only complete TTIs.
The maximum delay between S-CCPCH clusters that the UE may combine is set by UE performance requirements.
4.3 DPCCH/DPDCH synchronization
4.3.1 Synchronization primitives
4.3.1.1 General
For the dedicated channels, synchronization primitives are used to indicate the synchronization status of radio links,
both in uplink and downlink. The definition of the primitives is given in the following clauses.
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11 ETSI TS 101 851-4-3 V3.1.1 (2011-09)
4.3.1.2 Downlink synchronization primitives
Layer 1 in the UE shall every radio frame check synchronization status of the downlink dedicated channels.
Synchronization status is indicated to higher layers using the CPHY-Sync-IND and CPHY-Out-of-Sync-IND
primitives.
The criteria for reporting synchronization status are defined in two different phases.
The first phase starts when higher layers initiate physical dedicated channel establishment (as described in
TS 125 331 [i.4]) or whenever the UE initiates synchronization procedure A (as described in clause 4.3.2.1) and lasts
until 160 ms after the downlink dedicated channel is considered established by higher layers (physical channel
establishment is defined in TS 125 331 [i.4]). During this time out-of-sync shall not be reported and in-sync shall be
reported using the CPHY-Sync-IND primitive if the following criterion is fulfilled:
- The UE estimates the DPCCH quality over the previous 40 ms period to be better than a threshold Q . This
in
criterion shall be assumed not to be fulfilled before 40 ms of DPCCH quality measurements have been
collected. Q is defined implicitly by the relevant tests in TS 125 101 [7].
in
The second phase starts 160 ms after the downlink dedicated channel is considered established by higher layers. During
this phase both out-of-sync and in-sync are reported as follows.
Out-of-sync shall be reported using the CPHY-Out-of-Sync-IND primitive if any of the following criteria is fulfilled:
- The UE estimates the DPCCH quality over the previous 160 ms period to be worse than a threshold Q .
out
Q is defined implicitly by the relevant tests in TS 125 101 [7].
out
- The 20 most recently received transport blocks with a non-zero length CRC attached, as observed on all
TrCHs using non-zero length CRC, have been received with incorrect CRC. In addition, over the previous
160 ms, all transport blocks with a non-zero length CRC attached have been received with incorrect CRC. In
case no TFCI is used this criterion shall not be considered for the TrCH(s) not using guided detection if they
do not use a non-zero length CRC in all transport formats. If no transport blocks with a non-zero length CRC
attached are received over the previous 160 ms this criterion shall not be assumed to be fulfilled.
In-sync shall be reported using the CPHY-Sync-IND primitive if both of the following criteria are fulfilled:
- The UE estimates the DPCCH quality over the previous 160 ms period to be better than a threshold Q .
in
Q is defined implicitly by the relevant tests in TS 125 101 [7].
in
- At least one transport block with a non-zero length CRC attached, as observed on all TrCHs using non-zero
length CRC, is received in a TTI ending in the current frame with correct CRC. If no transport blocks are
received, or no transport block has a non-zero length CRC attached in a TTI ending in the current frame and in
addition over the previous 160 ms at least one transport block with a non-zero length CRC attached has been
received with a correct CRC, this criterion shall be assumed to be fulfilled. If no transport blocks with a
non-zero length CRC attached are received over the previous 160 ms this criterion shall also be assumed to be
fulfilled. In case no TFCI is used this criterion shall not be considered for the TrCH(s) not using guided
detection if they do not use a non-zero length CRC in all transport formats.
How the primitives are used by higher layers is described in TS 125 331 [i.4]. The above definitions may lead to radio
frames where neither the in-sync nor the out-of-sync primitives are reported.
4.3.1.3 Uplink synchronization primitives
Layer 1 in the satellite gateway shall every radio frame check synchronization status of all radio link sets.
Synchronization status is indicated to the RL Failure/Restored triggering function using either the CPHY-Sync-IND or
CPHY-Out-of-Sync-IND primitive. Hence, only one synchronization status indication shall be given per radio link set.
The exact criteria for indicating in-sync/out-of-sync is not subject to specification, but could e.g. be based on received
DPCCH quality or CRC checks. One example would be to have the same criteria as for the downlink synchronization
status primitives.
ETSI
12 ETSI TS 101 851-4-3 V3.1.1 (2011-09)
4.3.2 Radio link establishment and physical layer reconfiguration for
dedicated channels
4.3.2.1 General
Two synchronization procedures are defined in order to obtain physical layer synchronization of dedicated channels
between UE and USRAN:
- Synchronization procedure A: This procedure shall be used when at least one downlink dedicated physical
channel and one uplink dedicated physical channel are to be set up on a frequency and none of the radio links
after the establishment/reconfiguration existed prior to the establishment/reconfiguration which also includes
the following cases:
- the UE was previously on another RAT i.e. inter-RAT handover;
- the UE was previously on another frequency i.e. inter-frequency hard handover;
- the UE has all its previous radio links removed and replaced by other radio links
i.e. intra-frequency hard-handover;
- after it fails to complete an inter-RAT, intra- or inter-frequency hard-handover TS 125 133 [8], the UE
attempts to re-establish TS 125 331 [i.4] all the dedicated physical channels which were already
established immediately before the hard-handover attempt. In this case only steps c) and d) of
synchronization procedure A are applicable.
- Synchronization procedure B: This procedure shall be used when one or several radio links are added to the
active set and at least one of the radio links prior to the establishment/reconfiguration still exists after the
establishment/reconfiguration.
For existing radio links, the reconfiguration of downlink phase reference from P-CPICH or S-CPICH to dedicated pilots
is not supported. For all other physical layer reconfigurations not listed above, the UE and USRAN shall not perform
any of the synchronization procedures listed above.
The two synchronization procedures are described in clauses 4.3.2.3 and 4.3.2.4 respectively.
4.3.2.2 Satellite gateway radio link set state machine
In the satellite gateway, each radio link set can be in three different states: initial state, out-of-sync state and in-sync
state. Transitions between the different states are shown in figure 1. The state of the satellite gateway at the start of
radio link establishment is described in the following clauses. Transitions between initial state and in-sync state are
described in clauses 4.3.2.3 and 4.3.2.4 and transitions between the in-sync and out-of-sync states are described in
clause 4.3.3.2.
Initial
state
RL Restore
RL Failure
In-sync Out-of-sync
state state
RL Restore
Figure 1: Satellite gateway radio link set states and transitions
ETSI
13 ETSI TS 101 851-4-3 V3.1.1 (2011-09)
4.3.2.3 Synchronization procedure A
The synchronization establishment procedure, which begins at the time indicated by higher layers (either immediately at
receipt of upper layer signalling, or at an indicated activation time), is as follows:
a) Each satellite gateway involved in the procedure sets all the radio link sets which are to be set-up for this UE
in the initial state.
b) USRAN shall start the transmission of the downlink DPCCH and may start the transmission of DPDCH if any
data is to be transmitted. The initial downlink DPCCH transmit power is set by higher layers TS 125 433 [6].
Downlink TPC commands are generated as described in clause 5.1.2.2.1.2.
c) The UE establishes downlink chip and frame synchronization of DPCCH, using the P-CCPCH timing and
timing offset information notified from USRAN. Frame synchronization can be confirmed using the frame
synchronization word. Downlink synchronization status is reported to higher layers every radio frame
according to clause 4.3.1.2.
d) The UE shall not transmit on uplink until higher layers consider the downlink physical channel established. If
no activation time for uplink DPCCH has been signalled to the UE or if the UE attempts to re-establish the
DPCH after an inter-RAT, intra- or inter-frequency hard-handover failure TS 125 331 [i.4], uplink DPCCH
transmission shall start when higher layers consider the downlink physical channel established. If an activation
time has been given, uplink DPCCH transmission shall not start before the downlink physical channel has
been established and the activation time has been reached. Physical channel establishment and activation time
are defined in TS 125 331 [i.4]. The initial uplink DPCCH transmit power is set by higher layers
TS 125 331 [i.4]. In case the UE attempts to re-establish the DPCH after an inter-RAT, intra- or
inter-frequency hard-handover failure TS 125 331 [i.4] the initial uplink DPCCH power shall be the same as
the one used immediately preceding the inter-RAT, intra- or inter-frequency hard-handover attempt. In case of
physical layer reconfiguration the uplink DPCCH power is kept unchanged between before and after the
reconfiguration except for inner loop power control adjustments. A power control preamble shall be applied as
indicated by higher layers. The transmission of the uplink DPCCH power control preamble shall start N
pcp
radio frames prior to the start of uplink DPDCH transmission, where N is a higher layer parameter set by
pcp
USRAN TS 125 331 [i.4]; in case the UE attempts to re-establish the DPCH after an inter-RAT, intra- or
inter-frequency hard-handover failure TS 125 331 [i.4] the UE shall use the value of N as specified in
pcp
TS 125 331 [i.4] for this case. Note that the transmission start delay between DPCCH and DPDCH may be
cancelled using a power control preamble of 0 length. The starting time for transmission of DPDCHs shall also
satisfy the constraints on adding transport channels to a CCTrCH, as defined in TS 101 851-2-3 [2],
independently of whether there are any bits mapped to the DPDCHs. During the uplink DPCCH power control
preamble, independently of the selected TFC, no transmission is done on the DPDCH.
e) USRAN establishes uplink chip and frame synchronization. Frame synchronization can be confirmed using the
frame synchronization word. Radio link sets remain in the initial state until N_INSYNC_IND successive
in-sync indications are received from layer 1, when the satellite gateway shall trigger the RL Restore
procedure indicating which radio link set has obtained synchronization. When RL Restore has been triggered
the radio link set shall be considered to be in the in-sync state. The parameter value of N_INSYNC_IND is
configurable, see TS 125 433 [6]. The RL Restore procedure may be triggered several times, indicating when
synchronization is obtained for different radio link sets.
The total signalling response delay for the establishment of a new DPCH shall not exceed the requirements
given in TS 125 331 [i.4].
4.3.2.4 Synchronization procedure B
The synchronization procedure B, which begins at the time indicated by higher layers (either immediately at receipt of
upper layer signalling, or at an indicated activation time) is as follows:
a) The following applies to each satellite gateway involved in the procedure:
- New radio link sets are set up to be in initial state.
- If one or several radio links are added to an existing radio link set, this radio link set shall be considered
to be in the state the radio link set was prior to the addition of the radio link,
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