ETSI TS 101 376-5-7 V3.1.1 (2009-07)

GEO-Mobile Radio Interface Specifications (Release 3); Third Generation Satellite Packet Radio Service; Part 5: Radio interface physical layer specifications; Sub-part 7: Radio Subsystem Synchronization; GMR-1 3G 45.010

RTS/SES-00309-5-7

General Information

• Status: Published
• Publication Date: 06-Jul-2009
• Technical Committee: SES MSS - SES WG on Mobile Satellite Systems
• Current Stage: 12 - Completion
• Due Date: 22-Jun-2009
• Completion Date: 07-Jul-2009

Standards Content (Sample)

ETSI TS 101 376-5-7 V3.1.1 (2009-07)
Technical Specification


GEO-Mobile Radio Interface Specifications (Release 3);
Third Generation Satellite Packet Radio Service;
Part 5: Radio interface physical layer specifications;
Sub part 7: Radio Subsystem Synchronization;
GMR-1 3G 45.010

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GMR-1 3G 45.010 2 ETSI TS 101 376-5-7 V3.1.1 (2009-07)




Reference
RTS/SES-00309-5-7
Keywords
3G, GMPRS, GMR, GPRS, GSM, GSO,
interface, MES, mobile, MSS, radio, satellite,
S-PCN, synchronization, terminal, user
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© European Telecommunications Standards Institute 2009.
All rights reserved.

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GSM® and the GSM logo are Trade Marks registered and owned by the GSM Association.
ETSI

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GMR-1 3G 45.010 3 ETSI TS 101 376-5-7 V3.1.1 (2009-07)

Contents
Intellectual Property Rights . 5
Foreword . 5
Introduction . 6
1 Scope . 8
2 References . 8
2.1 Normative references . 8
2.2 Informative references . 9
3 Definitions and abbreviations . 9
3.1 Definitions . 9
3.2 Abbreviations . 10
4 General description of synchronization system . 10
4.1 System timing structure . 10
4.2 Timebase counter . 10
4.3 General requirement . 10
4.3.1 Timing and frequency reference point . 10
4.3.2 MES requirement . 10
4.3.3 Network requirement . 10
4.3.4 Measurement conditions . 11
5 Timing synchronization, TtG/GtT call . 11
5.1 General description. 11
5.2 Timing of forward link common channels . 11
5.2.1 FCCH/BCCH timing. 11
5.2.2 CCCH timing . 11
5.3 Idle mode timing synchronization . 11
5.3.1 Initial timing acquisition . 11
5.3.2 Paging mode . 12
5.3.3 Alerting mode . 12
5.4 Synchronization at initial access . 12
5.4.1 Synchronization process . 12
5.4.2 RACH timing pre-correction . 12
5.4.3 Description of parameters . 13
5.4.4 Timing accuracy . 13
5.5 Dedicated mode synchronization . 13
5.5.1 In-call timing relationship . 13
5.5.2 In-call synchronization scenario . 13
5.5.3 Transmission timing drift rate . 13
5.5.4 RX/TX guard time violation . 13
5.6 Packet transfer mode synchronization . 13
5.6.1 Packet transfer mode timing relationship. 13
5.6.2 Time synchronization for Packet switched channels . 14
5.6.3 Transmission timing drift rate . 16
5.6.4 Packet transfer mode timing relationship for handover to dedicated packet channel - Iu mode . 16
5.6.5 Packet transfer mode timing for handover to shared packet channel - Iu mode . 17
6 Frequency synchronization, TtG/GtT call . 17
6.1 General description. 17
6.2 Frequency of common channels . 17
6.3 Idle mode frequency synchronization. 18
6.3.1 Initial frequency acquisition . 18
6.3.2 Paging mode . 18
6.3.3 Alerting mode . 18
6.4 Synchronization at initial access . 18
6.4.1 Frequency compensation strategy . 18
ETSI

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GMR-1 3G 45.010 4 ETSI TS 101 376-5-7 V3.1.1 (2009-07)

6.4.2 Parameter description . 18
6.5 Dedicated mode synchronization . 18
6.6 Frequency synchronization for the packet switched channels . 18
7 Frame and message synchronization, TtG/GtT call . 19
7.1 Frame synchronization . 19
7.1.1 Frame number definition . 19
7.1.2 Frame synchronization scenario . 19
7.2 Message synchronization . 20
7.2.1 Power control message synchronization . 20
7.2.1.1 DCH power control message synchronization in forward direction . 20
7.2.1.2 DCH power control message synchronization in return direction . 20
7.2.2 SACCH message synchronization, TCH6/TCH9 call . 20
8 Synchronization for TtT call . 20
9 Aeronautical terminal synchronization scheme . 21
9.1 MES special features . 21
9.1.1 Speed . 21
9.1.2 Worst-case delay and Doppler features . 21
9.1.3 Frequency offset . 21
9.2 Frequency synchronization . 21
9.2.1 Frequency synchronization general description . 21
9.2.2 Idle mode frequency synchronization . 21
9.2.3 Synchronization at initial access . 21
9.2.4 Dedicated mode synchronization . 21
9.3 Timing synchronization . 21
Annex A (informative): Worst-case delay and Doppler features . 22
A.1 L-band . 22
A.2 S-band. 22
Annex B (informative): Range of timing correction factor . 24
Annex C (informative): Differential Doppler frequency . 25
Annex D (informative): SACCH message synchronization, TtG/GtT call . 26
Annex E (normative): Timer T3202 for packet mode of operation . 27
Annex F (normative): PTCCH/U and PTCCH/D scheduling . 28
Annex G (informative): Bibliography . 29
History . 30

ETSI

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GMR-1 3G 45.010 5 ETSI TS 101 376-5-7 V3.1.1 (2009-07)

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 contents of the present document are subject to continuing work within TC-SES and may change following formal
TC-SES approval. Should TC-SES modify the contents of the present document it will then be republished by ETSI
with an identifying change of release date and an increase in version number as follows:
Version 3.m.n
where:
• the third digit (n) is incremented when editorial only changes have been incorporated in the specification;
• the second digit (m) is incremented for all other types of changes, i.e. technical enhancements, corrections,
updates, etc.
The present document is part 5, sub-part 7 of a multi-part deliverable covering the GEO-Mobile Radio Interface
Specifications (Release 3); Third Generation Satellite Packet Radio Service, as identified below:
Part 1: "General specifications";
Part 2: "Service specifications";
Part 3: "Network specifications";
Part 4: "Radio interface protocol specifications";
Part 5: "Radio interface physical layer specifications":
Sub-part 1: "Physical Layer on the Radio Path: General Description";
Sub-part 2: "Multiplexing and Multiple Access; Stage 2 Service Description";
Sub-part 3: "Channel Coding";
Sub-part 4: "Modulation";
Sub-part 5: "Radio Transmission and Reception";
Sub-part 6: "Radio Subsystem Link Control";
Sub-part 7: "Radio Subsystem Synchronization";
Part 6: "Speech coding specifications";
Part 7: "Terminal adaptor specifications".
ETSI

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GMR-1 3G 45.010 6 ETSI TS 101 376-5-7 V3.1.1 (2009-07)

Introduction
GMR stands for GEO (Geostationary Earth Orbit) Mobile Radio interface, which is used for Mobile Satellite
Services (MSS) utilizing geostationary satellite(s). GMR is derived from the terrestrial digital cellular standard GSM
and supports access to GSM core networks.
The present document is part of the GMR Release 3 specifications. Release 3 specifications are identified in the title
and can also be identified by the version number:
• Release 1 specifications have a GMR 1 prefix in the title and a version number starting with "1" (V1.x.x).
• Release 2 specifications have a GMPRS 1 prefix in the title and a version number starting with "2" (V2.x.x).
• Release 3 specifications have a GMR-1 3G prefix in the title and a version number starting with "3" (V3.x.x).
The GMR release 1 specifications introduce the GEO-Mobile Radio interface specifications for circuit mode Mobile
Satellite Services (MSS) utilizing geostationary satellite(s). GMR release 1 is derived from the terrestrial digital cellular
standard GSM (phase 2) and it supports access to GSM core networks.
The GMR release 2 specifications add packet mode services to GMR release 1. The GMR release 2 specifications
introduce the GEO-Mobile Packet Radio Service (GMPRS). GMPRS is derived from the terrestrial digital cellular
standard GPRS (included in GSM Phase 2+) and it supports access to GSM/GPRS core networks.
The GMR release 3 specifications evolve packet mode services of GMR release 2 to 3rd generation UMTS compatible
services. The GMR release 3 specifications introduce the GEO-Mobile Radio Third Generation (GMR-1 3G) service.
Where applicable, GMR-1 3G is derived from the terrestrial digital cellular standard 3GPP and it supports access to
3GPP core networks.
Due to the differences between terrestrial and satellite channels, some modifications to the GSM or 3GPP standard are
necessary. Some GSM and 3GPP specifications are directly applicable, whereas others are applicable with
modifications. Similarly, some GSM and 3GPP specifications do not apply, while some GMR specifications have no
corresponding GSM or 3GPP specification.
Since GMR is derived from GSM and 3GPP, the organization of the GMR specifications closely follows that of GSM
or 3GPP as appropriate. The GMR numbers have been designed to correspond to the GSM and 3GPP numbering
system. All GMR specifications are allocated a unique GMR number. This GMR number has a different prefix for
Release 2 and Release 3 specifications as follows:
• Release 1: GMR n xx.zyy.
• Release 2: GMPRS n xx.zyy.
• Release 3: GMR-1 3G xx.zyy
where:
xx.0yy (z = 0) is used for GMR specifications that have a corresponding GSM or 3GPP specification. In this
case, the numbers xx and yy correspond to the GSM or 3GPP numbering scheme.
xx.2yy (z = 2) is used for GMR specifications that do not correspond to a GSM or 3GPP specification. In this
case, only the number xx corresponds to the GSM or 3GPP numbering scheme and the number yy is allocated
by GMR.
n denotes the first (n = 1) or second (n = 2) family of GMR specifications.
ETSI

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GMR-1 3G 45.010 7 ETSI TS 101 376-5-7 V3.1.1 (2009-07)

A GMR system is defined by the combination of a family of GMR specifications and GSM and 3GPP specifications as
follows:
• If a GMR specification exists it takes precedence over the corresponding GSM or 3GPP specification (if any).
This precedence rule applies to any references in the corresponding GSM or 3GPP specifications.
NOTE: Any references to GSM or 3GPP specifications within the GMR specifications are not subject to this
precedence rule. For example, a GMR specification may contain specific references to the corresponding
GSM or 3GPP specification.
• If a GMR specification does not exist, the corresponding GSM or 3GPP specification may or may not apply.
The applicability of the GSM and 3GPP specifications is defined in GMR 1 3G 41.201 [8].
ETSI

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GMR-1 3G 45.010 8 ETSI TS 101 376-5-7 V3.1.1 (2009-07)

1 Scope
The present document presents the requirements for synchronizing timing and frequency between the MES and the
Gateway Station (GS) in the GMR-1 3G Mobile Satellite System for circuit switch and packet switch modes of
operation.
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.
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] GMPRS-1 01.004 (ETSI TS 101 376-1-1): "GEO-Mobile Radio Interface Specifications
(Release 2) General Packet Radio Service; Part 1: General specifications;
Sub-part 1: Abbreviations and acronyms".
NOTE: This is a reference to a GMR-1 Release 2 specification. See the introduction for more details.
[2] GMR-1 3G 44.008 (ETSI TS 101 376-4-8): "GEO-Mobile Radio Interface Specifications
(Release 3); Third Generation Satellite Packet Radio Service; Part 4: Radio interface protocol
specifications; Sub-part 8: Mobile Radio Interface Layer 3 Specifications".
[3] GMR-1 3G 45.002 (ETSI TS 101 376-5-2): "GEO-Mobile Radio Interface Specifications
(Release 3); Third Generation Satellite Packet Radio Service; Part 5: Radio interface physical layer
specifications; Sub-part 2: Multiplexing and Multiple Access; Stage 2 Service Description".
[4] GMR-1 3G 45.005 (ETSI TS 101 376-5-5): "GEO-Mobile Radio Interface Specifications
(Release 3); Third Generation Satellite Packet Radio Service; Part 5: Radio interface physical layer
specifications; Sub-part 5: Radio Transmission and Reception".
[5] GMR-1 3G 45.008 (ETSI TS 101 376-5-6): "GEO-Mobile Radio Interface Specifications
(Release 3); Third Generation Satellite Packet Radio Service; Part 5: Radio interface physical layer
specifications; Sub-part 6: Radio Subsystem Link Control".
[6] GMR-1 05.010 (ETSI TS 101 376-5-7) (V1.3.1): "GEO-Mobile Radio Interface Specifications
(Release 1); Part 5: Radio interface physical layer specifications; Sub-part 7: Radio Subsystem
Synchronization".
NOTE: This is a reference to a GMR-1 Release 1 specification. See the introduction for more details.
ETSI

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GMR-1 3G 45.010 9 ETSI TS 101 376-5-7 V3.1.1 (2009-07)

[7] GMR-1 3G 44.060 (ETSI TS 101 376-4-12): "GEO-Mobile Radio Interface Specifications
(Release 3); Third Generation Satellite Packet Radio Service; Part 4: Radio interface protocol
specifications; Sub-part 12: Mobile Earth Station (MES) - Base Station System (BSS) interface;
Radio Link Control/Medium Access Control (RLC/MAC) protocol".
[8] GMR-1 3G 41.201 (ETSI TS 101 376-1-2): "GEO-Mobile Radio Interface Specifications
(Release 3); Third Generation Satellite Packet Radio Service; Part 1: General specifications;
Sub-part 2: Introduction to the GMR-1 family".
[9] GMR-1 3G 44.118 (ETSI TS 101 376-4-13): "GEO-Mobile Radio Interface Specifications
(Release 3); Third Generation Satellite Packet Radio Service; Part 4: Radio interface protocol
specifications; Sub-part 13: Radio Resource Control (RRC) protocol; Iu Mode".
2.2 Informative references
The following referenced documents are not essential to the use of the present document but they assist the user with
regard to a particular subject area. For non-specific references, the latest version of the referenced document (including
any amendments) applies.
Not applicable.
3 Definitions and abbreviations
3.1 Definitions
For the purposes of the present document, the terms and definitions given in GMR-1 3G 41.201 [8] and the following
apply:
Frequency Correction (FC): in-call frequency correction sent over FACCH channel
frequency offset: frequency correction sent over AGCH channel
guard time violation: a message to indicate the violation of Rx/Tx burst guard time
MAC_FORWARD_TS_OFFSET: offset in number of timeslots of MAC-slot 0 or D-MAC-slot 0 relative to the start
of the downlink frame
MAC_RETURN_TS_OFFSET: offset in number of timeslots of MAC-slot 0 or D-MAC-slot 0 relative to the start of
the uplink frame
Precorrection Indication (PI): timing delay pre-compensated by the MES in the RACH transmission
RACH_TS_OFFSET: RACH window offset relative to the start of BCCH window within the same frame, measured in
number of timeslots
RACH_SYMBOL_OFFSET: RACH timing offset in symbols
NOTE: The offset between RACH window and the start of the reference frame seen from the MES. Measured in
number of symbols.
SA_BCCH_STN: BCCH window offset relative to the start of the frame, in number of timeslots
SA_FREQ_OFFSET: twice of the downlink beam centre Doppler due to satellite motion only
SA_SIRFN_DELAY: within each multiframe, the first FCCH channel frame number relative to the start of the
multiframe
SB_FRAME_TS_OFFSET: offset between downlink frame N and uplink frame N + 7 at the spot-beam centre,
measured in number of timeslots
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GMR-1 3G 45.010 10 ETSI TS 101 376-5-7 V3.1.1 (2009-07)

SB_SYMBOL_OFFSET: additional offset between downlink frame N and uplink frame N + 7 at the spot beam centre,
measured in number of symbols
Timing Correction (TC): in-call timing correction sent over FACCH channel
timing offset: timing correction sent over AGCH channel
USF Delay Value: if an MES receives a USF in its receive downlink frame N, it applies the USF (i.e. transmits
corresponding to the received USF grant) on the uplink frame numbered (N + USF Delay Value)
NOTE: USF Delay Value is decoded from USF_DELAY and USF_DELAY Adjustment parameters in BCCH
System Information, and it can take values of 6, 7, 8, 9 or 10.
3.2 Abbreviations
For the purposes of the present document, the abbreviations defined in GMPRS-1 01.004 [1] apply.
4 General description of synchronization system
Same as clause 4 in GMR-1 05.010 [6], with addition of following at the end of the first paragraph.
The description above also applies to S-band.
4.1 System timing structure
Same as clause 4.1 in GMR-1 05.010 [6].
4.2 Timebase counter
Same as clause 4.2 in GMR-1 05.010 [6].
4.3 General requirement
4.3.1 Timing and frequency reference point
Same as clause 4.3.1 in GMR-1 05.010 [6].
4.3.2 MES requirement
Same as clause 4.3.2 in GMR-1 05.010 [6], with the addition of the following:
• MES receiver's time and frequency search ranges (aper
...