ETSI TS 101 376-5-6 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 6: Radio Subsystem Link Control; GMR-1 3G 45.008

RTS/SES-00309-5-6

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 101 376-5-6 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 6: Radio Subsystem Link Control;
GMR-1 3G 45.008

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GMR-1 3G 45.008 2 ETSI TS 101 376-5-6 V3.1.1 (2009-07)




Reference
RTS/SES-00309-5-6
Keywords
3G, control, gateway, GMPRS, GMR, GPRS,
GSM, GSO, interface, MES, mobile, MSC, MSS,
radio, satellite, S-PCN
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ETSI

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GMR-1 3G 45.008 3 ETSI TS 101 376-5-6 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 . 11
4 General . 11
5 RF power control . 11
6 Radio link failure . 11
7 Idle mode tasks . 11
8 Network prerequisites. 12
8.1 BCCH carriers with FCCH . 12
8.2 BCCH carriers with FCCH3 . 12
9 Aspects of Discontinuous Transmission (DTX) . 12
9.1 Rules of burst transmission (A/Gb mode) . 12
9.2 Rules of burst transmission on a Dedicated CHannel (DCH) (Iu mode) . 12
10 Radio link measurements . 13
11 Control parameters . 13
12 GMPRS mode tasks . 13
12.1 GMPRS and GMR-1 3G spot beam selection and reselection . 13
12.1.1 BCCH type identification (A/Gb mode only) . 13
12.1.2 Spot beam selection . 14
12.1.3 Spot beam reselection . 14
12.2 Idle mode link loss (A/Gb model only) . 14
12.3 Link adaptation . 14
12.3.1 Objective and overall procedure . 14
12.3.2 Power control and link adaptation parameters . 15
12.3.3 PAN, FQI, SQIR, and SQISDR transmission . 15
12.3.3.1 Terminal Type A, C and D . 15
12.3.3.2 Terminal Type E and above . 15
12.3.4 PAR transmission . 15
12.3.4.1 Terminal Type A, C, and D . 15
12.3.4.2 Terminal Type E and above . 15
12.3.5 MES output power . 16
12.3.5.1 Terminal Type A, C, D, E and above . 16
12.3.5.2 Open-loop power control at a terminal type C MES . 16
12.3.5.2.1 Signal quality estimation . 16
12.3.5.2.2 Open-loop power control procedure . 16
12.3.6 GS output power . 17
12.3.7 Radio link measurements and accuracy requirements . 17
12.3.8 Signal Quality Indicator Report (SQIR) and Signal Quality Standard Deviation (SQISDR)
transmissions. 18
12.3.8a Forward Quality Indicator (FQI) transmissions . 20
12.3.9 Code rate adaptation . 20
ETSI

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GMR-1 3G 45.008 4 ETSI TS 101 376-5-6 V3.1.1 (2009-07)

12.3.9.1 Terminal type A . 20
12.3.9.2 Terminal type C . 21
12.3.9.3 Terminal type D . 21
12.3.9.4 Terminal type E and above. 21
12.4 UT Link Quality Report (UTLQR) handling. 22
12.5 Timing for the power level adjustment. 22
13 Idle Mode Tasks with FCCH3 . 22
13.1 Introduction . 22
13.2 Measurements for stored list spot beam selection . 23
13.3 All LMSS band carrier spot beam search . 23
13.4 Criteria for Spot Beam Selection and Reselection . 23
13.4.1 MES Capabilities and Operating Environment . 24
13.4.2 Position-Based Spot Beam Selection . 24
13.4.3 Power-Based Spot Beam Selection . 25
13.4.3.1 Spot Beam BCCH Power Comparison . 26
13.4.3.2 BCCH Flux Density Criterion (C1) . 27
13.5 Minimum Signal Strength for Transmission Via the RACH3 . 27
13.6 Spot beam reselection . 27
13.7 BCCH read operation . 28
13.8 Abnormal cases and emergency calls . 28
Annex A (informative): Pseudocode for power control . 30
Annex B (informative): Per-burst SQI estimation . 31
Annex C (informative): Position determination at the MES . 32
Annex D (informative): Bibliography . 33
History . 34

ETSI

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GMR-1 3G 45.008 5 ETSI TS 101 376-5-6 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 6 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 45.008 6 ETSI TS 101 376-5-6 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 45.008 7 ETSI TS 101 376-5-6 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 or 3GPP specifications are not subject to
this precedence rule. For example, a GMR or 3GPP 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 1 41.201 [9].
ETSI

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GMR-1 3G 45.008 8 ETSI TS 101 376-5-6 V3.1.1 (2009-07)

1 Scope
The present document specifies several control aspects for the radio link between the Mobile Earth Station (MES) and
the Gateway Station (GS) in the GMR-1 3G Mobile Satellite System. It specifies the operation of power control and
defines dead link detection. It makes requirements for DTX operation.
The present document also defines requirements for the MES for monitoring system information, as prerequisites to
system access, and upon exit from dedicated mode. It makes requirements for spot beam selection and reselection. It
defines the nature of the measurements that the MES uses to implement these processes.
Timing and frequency control aspects of link control are to be found in GMR-1 3G 45.010 [6], and messages for timing
and frequency control are defined in GMR-1 3G 44.008 [3].
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 (GMPRS); 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 43.022 (ETSI TS 101 376-3-10): "GEO-Mobile Radio Interface Specifications
(Release 3); Third Generation Satellite Packet Radio Service; Part 3: Network specifications;
Sub-part 10: Functions related to Mobile Earth Station (MES) in idle mode".
[3] 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".
[4] GMR-1 3G 45.003 (ETSI TS 101 376-5-3): "GEO-Mobile Radio Interface Specifications
(Release 3); Third Generation Satellite Packet Radio Service; Part 5: Radio interface physical layer
specifications; Sub-part 3: Channel Coding".
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GMR-1 3G 45.008 9 ETSI TS 101 376-5-6 V3.1.1 (2009-07)

[5] 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".
[6] GMR-1 3G 45.010 (ETSI TS 101 376-5-7): "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".
[7] GMR-1 05.008 (ETSI TS 101 376-5-6): "GEO-Mobile Radio Interface Specifications (Release 1);
Part 5: Radio interface physical layer specifications; Sub-part 6: Radio Subsystem Link Control".
NOTE: This is a reference to a GMR-1 Release 1 specification. See the introduction for more details.
[8] 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".
[9] 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".
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 [9] and the following
apply:
Average Power Used (APU): at the beginning of each call, the MES will start a running power-averaged PAS setting,
expressed in dB
NOTE: This parameter will be transmitted upon receipt of an INFORMATION REQUEST message from the
network, with a power control request code.
BCCH_FULL_LIST: list of all the Broadcast Control CHannel (BCCH) numbers used by the network
BCCH_NEIGHBOR_LIST: list of the neighbouring spot beams' BCCH numbers, starting timeslots, and system
information cycle offsets
Call Quality Metric (CQM): at the beginning of each call, the MES will start a running average of the percentage of
post-FEC burst errors occurring for the call
NOTE: This parameter will be transmitted upon receipt of an INFORMATION REQUEST message from the
network, with a power control request code.
criterion C1: used by the MES for detecting the presence of the frequency control channel (FCCH) and switching out
of the frequency search state
Link Quality Indication (LQI): amount of available link margin with respect to SQT, expressed in dB
NOTE: A positive value indicates the amount of additional link margin in reserve. A negative value indicates that
power control is at saturation and that the SQT is not being met by the indicated value.
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GMR-1 3G 45.008 10 ETSI TS 101 376-5-6 V3.1.1 (2009-07)

link margin: difference (in dB) between the SQI at the receiver corresponding to the maximum transmit power level
and the SQT
Open Loop Threshold (Olthresh): the parameter Olthresh is the threshold on the LQI estimate before activating open
loop power control
Open Loop Gain (Olgain): the parameter Olgain is the loop gain for open loop control
Power Attenuation Notification (PAN): attenuation, in dB, used by the transmitter in the power control loop, relative
to the maximum transmit power level
Power Attenuation Request (PAR): attenuation, in dB, requested by the receiver in the power control loop, relative to
the maximum transmit power level
power control loop gain: number by which the difference between SQT and SQI is multiplied to derive the power
correction value
NOTE 1: Two loop gains are defined:
GainDn: used as the loop gain if the difference between SQT and SQI is negative;
GainUp: used as the loop gain otherwise (i.e. if the difference between SQT and SQI is not
negative).
NOTE 2: The loop gain is a unitless number with a default value of 1,0.
Power Control Topped-Out (PCTO): at the beginning of each call, the MES will start a running average of the
percentage of messages for which the calculated PAS is less than PASmin
NOTE: This parameter will be transmitted upon receipt of an INFORMATION REQUEST message from the
network, with a power control request code.
radio link failure counter S: counter whose value of zero determines the failure of the radio link
reserve link margin: difference (in dB) between the SQI corresponding to the maximum transmit power level and the
actual SQI at the receiver
RADIO_LINK_TIMEOUT: maximum value of the radio link failure counter S
Received Signal Strength Indication (RSSI): root mean squared (rms) value of the signal received at the receiver
antenna
NOTE: The RSSI estimate is compensated for all the time-varying processes (such as automatic gain control) that
affect the estimation procedure for obtaining a relative measure to use in comparing the strength of
signals received at different times.
SB_RESELECT_HYSTERESIS: value in dB by which a nonserving beam's BCCH power measurement must exceed
the serving beam's BCCH power before the MES switches to the nonserving beam
SB_SELECTION_POWER: during the spot beam selection and reselection, the MES selects only those BCCH
carriers whose receive power is within SB_SELECTION_POWER dB of the strongest BCCH carrier
SB_RESELECTION_TIMER: maximum time interval between consecutive spot beam reselection procedures
Signal Quality Indication (SQI) or Signal Quality Measurement (SQM): estimate of the ratio of signal power to the
noise and the interference power S / (N + I) formed at the receiver in the power control loop
NOTE 1: The terms SQI and SQM are used interchangeably in the present document. The term SQI is used for the
descriptions related to circuit
...