ETSI ETS 300 925 ed.2 (1997-08)

Digital cellular telecommunications system (Phase 2+) (GSM); Voice Group Call Service (VGCS); Stage 1 (GSM 02.68 version 5.1.3)

RE/SMG-010268QR1

Digitalni celični telekomunikacijski sistem (faza 2+) – Storitev govornega skupinskega klica (VGCS) – Stopnja 1 (GSM 02.68, različica 5.1.3)

General Information

• Status: Published
• Publication Date: 25-Aug-1997
• Technical Committee: SMG 1 - Services & Facilities
• Current Stage: 12 - Completion
• Due Date: 15-Aug-1997
• Completion Date: 26-Aug-1997
• Mandate: UIC
• Ref Project: SIST ETS 300 925 E2:2003 - Digital cellular telecommunications system (Phase 2+) (GSM); Voice Group Call Service (VGCS); Stage 1 (GSM 02.68 version 5.1.3)

Standards Content (Sample)

SLOVENSKI STANDARD
SIST ETS 300 925 E2:2003
01-december-2003
'LJLWDOQLFHOLþQLWHOHNRPXQLNDFLMVNLVLVWHPID]D±6WRULWHYJRYRUQHJD
VNXSLQVNHJDNOLFD9*&6±6WRSQMD*60UD]OLþLFD
Digital cellular telecommunications system (Phase 2+) (GSM); Voice Group Call Service
(VGCS); Stage 1 (GSM 02.68 version 5.1.3)
Ta slovenski standard je istoveten z: ETS 300 925 Edition 2
ICS:
33.070.50 Globalni sistem za mobilno Global System for Mobile
telekomunikacijo (GSM) Communication (GSM)
SIST ETS 300 925 E2:2003 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST ETS 300 925 E2:2003

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SIST ETS 300 925 E2:2003
EUROPEAN ETS 300 925
TELECOMMUNICATION August 1997
STANDARD Second Edition
Source: ETSI SMG Reference: RE/SMG-010268QR1
ICS: 33.020
Key words: Digital cellular telecommunications system, Global System for Mobile communications (GSM)
R
GLOBAL SYSTEM FOR
MOBILE COMMUNICATIONS
Digital cellular telecommunications system (Phase 2+);
Voice Group Call Service (VGCS) - Stage 1
(GSM 02.68 version 5.1.3)
ETSI
European Telecommunications Standards Institute
ETSI Secretariat
Postal address: F-06921 Sophia Antipolis CEDEX - FRANCE
Office address: 650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCE
X.400: c=fr, a=atlas, p=etsi, s=secretariat - Internet: [e-mail]
Tel.: [phone] - Fax: [phone]
Copyright Notification: No part may be reproduced except as authorized by written permission. The copyright
and the foregoing restriction extend to reproduction in all media.
© European Telecommunications Standards Institute 1997. All rights reserved.

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ETS 300 925 (GSM 02.68 version 5.1.3): August 1997
Whilst every care has been taken in the preparation and publication of this document, errors in content,
typographical or otherwise, may occur. If you have comments concerning its accuracy, please write to
"ETSI Editing and Committee Support Dept." at the address shown on the title page.

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ETS 300 925 (GSM 02.68 version 5.1.3): August 1997
Contents
Foreword .5
1 Scope .7
2 Normative references.7
3 Definitions and abbreviations .8
3.1 Definitions .8
3.2 Abbreviations .8
4 Description .9
5 Normal operation with successful outcome.12
5.1 Provision .12
5.2 Withdrawal .12
5.3 Network related service configuration.12
5.4 Normal operation for voice group call establishment.12
5.5 Charging requirements .12
6 Exceptional procedures or unsuccessful outcome.13
7 Interaction with other GSM services.13
7.1 Calling Line Identification Presentation (CLIP) .13
7.2 Calling Line Identification Restriction (CLIR) .13
7.3 Connected Line Identification Presentation (COLP) .13
7.4 Connected Line Identification Restriction (COLR) .13
7.5 Call Forwarding Unconditional (CFU) .13
7.6 Call Forwarding on mobile subscriber Busy (CFB).13
7.7 Call Forwarding on No Reply (CFNRy).14
7.8 Call Forwarding on mobile subscriber Not Reachable (CFNRc) .14
7.9 Call Waiting (CW).14
7.10 Call Hold (HOLD).14
7.11 Multi-party Service (MPTY).14
7.12 Closed User Group (CUG).14
7.13 Advice of Charge (AoC).14
7.14 Barring of All Outgoing Calls (BAOC) .14
7.15 Barring of Outgoing International Calls (BOIC).14
7.16 Barring of Outgoing International Calls except those to the Home PLMN country
(BOIC-exHC) .15
7.17 Barring of All Incoming Calls (BAIC).15
7.18 Barring of Incoming Calls when Roaming outside the home PLMN country (BIC-Roam).15
7.19 Explicit Call Transfer (ECT) . 15
7.20 Enhanced Multi-Level Precedence and Pre-emption service (eMLPP).15
7.21 Short Message Service (SMS).15
7.22 Operator Determined Barring (ODB) .15
8 Interworking considerations.15
Annex A (informative): Status of Technical Specification GSM 02.68 .16
History.17

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ETS 300 925 (GSM 02.68 version 5.1.3): August 1997
Foreword
This draft European Telecommunication Standard (ETS) has been produced by the Special Mobile Group
(SMG) of the European Telecommunications Standards Institute (ETSI).
This ETS specifies the stage one description of the Voice Group Call Service (VGCS) within the digital
cellular telecommunications system.
The contents of this ETS is subject to continuing work within SMG and may change following formal SMG
approval. Should SMG modify the contents of this ETS, it will be resubmitted for OAP by ETSI with an
identifying change of release date and an increase in version number as follows:
Version 5.x.y
where:
y the third digit is incremented when editorial only changes have been incorporated in the
specification;
x the second digit is incremented for all other types of changes, i.e. technical enhancements,
corrections, updates, etc.
Transposition dates
Date of adoption: 18 April 1997
Date of latest announcement of this ETS (doa): 30 November 1997
Date of latest publication of new National Standard
or endorsement of this ETS (dop/e): 31 May 1998
Date of withdrawal of any conflicting National Standard (dow): 31 May 1998

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1 Scope
This European Telecommunication Standard (ETS) specifies the stage one description of the Voice Group
Call Service (VGCS) which allows speech conversation of a predefined group of service subscribers in
half duplex mode on the radio link taking into account multiple mobile service subscribers involved in the
VGCS call per cell.
The VGCS is applicable to all mobile stations in a certain network and area which have the technical
capability and the corresponding subscription, respectively, to participate in a VGCS call.
NOTE: It is not considered as requirement that normal GSM phase 2 mobile stations will be
able to be used for this service.
The service is described from the service subscriber's and user's point of view; in particular:
- the procedure for normal operation with successful outcome;
- the action to be taken in exceptional circumstances;
- the interaction with other GSM services and features.
This ETS does not deal with the Man-Machine Interface (MMI) requirements, but makes reference to the
appropriate Global System for Mobile Communications (GSM) specifications.
This ETS defines a teleservice of the digital cellular telecommunications system GSM. Any interaction with
other services and/or networks not dealt with in clauses 7 or 8 are outside the scope of this ETS.
2 Normative references
This ETS incorporates by dated and undated reference, provisions from other publications. These
normative references are cited at the appropriate places in the text and the publications are listed
hereafter. For dated references, subsequent amendments to or revisions of any of these publications
apply to this ETS only when incorporated in it by the amendment or revision. For undated references, the
latest edition of the publication referred to applies.
[1] GSM 01.04 (ETR 350): "Digital cellular telecommunications system (Phase 2+);
Abbreviations and acronyms".
[2] GSM 02.67 (ETS 300 924): "Digital cellular telecommunications system
(Phase 2+); enhanced Multi-Level Precedence and Pre-emption service
(eMLPP) - Stage 1".

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3 Definitions and abbreviations
3.1 Definitions
For the purposes of this ETS, the following definitions apply:
network operator: Entity which provides the network operating elements and resources for the execution
of the VGCS.
service provider: Entity which offers the VGCS for subscription. The network operator may be the
service provider.
voice group call: An instance of the VGCS initiated by a subscriber. This term is used synonymously with
the term "VGCS call".
service subscriber: Mobile subscriber which subscribes to the VGCS.
group identification (group ID): A numerical classification. The maximum number of group IDs which
can be defined in one PLMN depends on the maximum number of group call areas defined in this PLMN.
8
The maximum number of group IDs and group call areas combined is 10 , Service subscriber shall be
provided with one or up to 50 group IDs.
dispatcher: Particular fixed line or mobile users are identified within the network as dispatchers.
Dispatchers shall receive all voice group calls to a certain group ID in a group call area (this shall be done
automatically by the network). In addition they can initiate voice group calls to a group ID in a group call
area.
Dispatchers shall be connected to a voice group call by means of standard links via radio or via an ISDN.
They shall be called by their ISDN or MSISDN number, respectively. When dispatchers initiate voice
group calls, they shall call a particular MSISDN number which is related to a group ID and group call area.
Dispatchers using the GSM network can be located outside of this group call area.
The identities of the dispatchers are exclusively predefined in the network by the service provider. There
will be none or up to five dispatchers involved in a particular voice group call.
destination subscriber: Service subscriber or dispatcher to which the VGCS call is directed.
calling subscriber: Service subscriber or dispatcher which originates the VGCS call.
group call area: Predefined area composed of one or a cluster of cells to which a particular VGCS call is
distributed. The maximum number of group call area IDs which can be defined in one PLMN depends on
the maximum number of group IDs defined in this PLMN. The maximum number of group IDs and group
8
call areas combined is 10 , The composition of a group call area is predefined in the network by the
service provider. Changing of cell allocation in the network due to operational reasons will need an
adaptation of the group call area definition. The group call area may include more then one MSC area and
cells of more than one PLMN.
group call member: Any service subscriber or dispatcher participating in an on going voice group call.
3.2 Abbreviations
Abbreviations used in this ETS are listed in GSM 01.04.

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4 Description
The VGCS is defined in the following. Figure 1 gives an explanation of the logical concept of the VGCS.
a) The VGCS enables a calling subscriber to establish a voice group call to destination subscribers
belonging to a predefined group call area and group ID.
NOTE 1: The service is provided by use of half duplex transmission mode.
Applications for voice group call services typically involve multiple group members in a small group
call area, for which the VGCS should provide spectrum efficient solutions.
b) The calling subscriber as well as the destination subscribers may be any service subscriber which
has subscribed to the related group ID or any dispatcher who is entitled to it by his identity which
shall be registered in the network.
c) Destination subscribers are all service subscribers or a group of service subscribers identified by
the called group ID which have their present location in the group call area, and pre-registered
dispatchers. Destination service subscribers shall be notified with the group ID, not by paging the
subscriber individually. Dispatchers shall be called individually with their identity.
Service subscribers may become late destination subscribers when entering the group call area
within 500 ms after reception of the first notification message related to the VGCS call. Service
subscribers which leave the corresponding group call area during an on going VGCS call of which
they are member cease to be destination subscribers.
d) The voice group call shall be established in a group call area which is comprised of one or a cluster
of cells. Group call areas shall be predefined in the network by the service provider, co-ordinated by
the network operator.
In case of a service subscriber initiating a VGCS, the group call area is uniquely identified by the
actual cell in which the service subscriber resides at the moment of VGCS call initialization and by
the group ID they issue.
A dispatcher initiating a VGCS call will be connected to a related predefined group call area. The
entitlement of the dispatcher is checked by the netw
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