ETSI TS 101 376-5-4 V2.3.1 (2008-08)

GEO-Mobile Radio Interface Specifications (Release 2); General Packet Radio Service; Part 5: Radio interface physical layer specifications; Sub-part 4: Modulation; GMPRS-1 05.004

RTS/SES-00303-5-4

General Information

• Status: Published
• Publication Date: 07-Aug-2008
• Technical Committee: SES MSS - SES WG on Mobile Satellite Systems
• Current Stage: 12 - Completion
• Due Date: 08-Aug-2008
• Completion Date: 08-Aug-2008

Standards Content (Sample)

ETSI TS 101 376-5-4 V2.3.1 (2008-08)
Technical Specification


GEO-Mobile Radio Interface Specifications (Release 2);
General Packet Radio Service;
Part 5: Radio interface physical layer specifications;
Sub-part 4: Modulation;
GMPRS-1 05.004

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GMPRS-1 05.004 2 ETSI TS 101 376-5-4 V2.3.1 (2008-08)




Reference
RTS/SES-00303-5-4
Keywords
GMPRS, GMR, GSM, GSO, interface, MES,
mobile, modulation, MSS, radio, satellite, S-PCN
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GMPRS-1 05.004 3 ETSI TS 101 376-5-4 V2.3.1 (2008-08)

Contents
Intellectual Property Rights.4
Foreword.4
Introduction .5
1 Scope.6
2 References.6
2.1 Normative references.6
2.2 Informative references.7
3 Definitions and abbreviations.7
3.1 Definitions.7
3.2 Abbreviations.7
4 Burst structure .7
4.1 Signal representation.7
4.2 Modulating symbol rate.7
4.3 Start and stop of the burst.7
4.4 Data bits and data symbols.7
4.5 Packet burst structure .7
4.5.1 Modulating symbol rate .7
4.5.2 Start and stop of the burst .8
4.5.3 Data bits and data symbols .8
5 Normal burst.9
5.1 π/4-CQPSK modulation .9
5.1.1 Filtering.9
5.1.2 Power ramp.9
5.2 π/4-CBPSK modulation .9
5.3 PNB modulation.9
6 DKABs.15
6.1 π/4-DBPSK modulation .15
7 BACH.15
7.1 Modulation format.15
8 Frequency correction burst.15
8.1 Modulation format.15
9 Modulation accuracy.16
Annex A (informative): Change Record.17
History .18

ETSI

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GMPRS-1 05.004 4 ETSI TS 101 376-5-4 V2.3.1 (2008-08)

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 2.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 4 of a multi-part deliverable covering the GEO-Mobile Radio Interface
Specifications (Release 2); General 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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GMPRS-1 05.004 5 ETSI TS 101 376-5-4 V2.3.1 (2008-08)

Introduction
GMR stands for Geostationary Earth Orbit (GEO) 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 2 specifications. Release 2 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.).
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.
Due to the differences between terrestrial and satellite channels, some modifications to the GSM standard are necessary.
Some GSM specifications are directly applicable, whereas others are applicable with modifications. Similarly, some
GSM specifications do not apply, while some GMR specifications have no corresponding GSM specification.
Since GMR is derived from GSM, the organization of the GMR specifications closely follows that of GSM. The GMR
numbers have been designed to correspond to the GSM numbering system. All GMR specifications are allocated a
unique GMR number. This GMR number has a different prefix for Release 2 specifications as follows:
• Release 1: GMR-n xx.zyy.
• Release 2: GMPRS-n xx.zyy.
where:
- xx.0yy (z = 0) is used for GMR specifications that have a corresponding GSM specification. In this case,
the numbers xx and yy correspond to the GSM numbering scheme.
- xx.2yy (z = 2) is used for GMR specifications that do not correspond to a GSM specification. In this
case, only the number xx corresponds to the GSM numbering scheme and the number yy is allocated by
GMR.
- n denotes the first (n = 1) or second (n = 2) family of GMR specifications.
A GMR system is defined by the combination of a family of GMR specifications and GSM specifications as follows:
• If a GMR specification exists it takes precedence over the corresponding GSM specification (if any). This
precedence rule applies to any references in the corresponding GSM specifications.
NOTE: Any references to GSM 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
specification.
• If a GMR specification does not exist, the corresponding GSM specification may or may not apply. The
applicability of the GSM specifications is defined in GMPRS-1 01.201 [2].
ETSI

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GMPRS-1 05.004 6 ETSI TS 101 376-5-4 V2.3.1 (2008-08)

1 Scope
The present document defines the modulation used within the GMR-1 Mobile Satellite System. It includes the various
modulation formats that are required for different physical channel types. It also defines the concept of the transmission
burst and the mapping of modulated symbols to the burst, describes the required transmit filtering in general terms, and
specifies the modulation accuracy.
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, info
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