SIST ETS 300 934 E1:2003

SLOVENSKI STANDARD
SIST ETS 300 934 E1:2003
01-december-2003
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Digital cellular telecommunications system (Phase 2+) (GSM); Voice Broadcast Service
(VBS); Stage 2 (GSM 03.69 version 5.1.2)
Ta slovenski standard je istoveten z: ETS 300 934 Edition 1
ICS:
33.070.50 Globalni sistem za mobilno Global System for Mobile
telekomunikacijo (GSM) Communication (GSM)
SIST ETS 300 934 E1:2003 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST ETS 300 934 E1:2003

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SIST ETS 300 934 E1:2003
EUROPEAN ETS 300 934
TELECOMMUNICATION May 1997
STANDARD
Source: ETSI TC-SMG Reference: DE/SMG-030369QR
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 Broadcast Service (VBS) - Stage 2
(GSM 03.69 version 5.1.2)
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: secretariat@etsi.fr
Tel.: +33 4 92 94 42 00 - Fax: +33 4 93 65 47 16
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 300 934 (GSM 03.69 version 5.1.2): May 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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Contents
Foreword .5
1 Scope .7
2 Normative references.7
3 Definitions and abbreviations .8
3.1 Definitions .8
3.2 Abbreviations .8
4 Main concepts .9
4.1 Group definition.9
4.2 Broadcast process .9
4.2.1 Broadcast call initiation.9
4.2.1.1 Normal operation with successful outcome.9
4.2.1.2 Exceptional procedures .10
4.2.2 On-going broadcast calls.10
4.2.2.1 Normal operation with successful outcome.10
4.2.2.2 Exceptional procedures .11
4.2.3 Leaving of a broadcast call without termination .11
4.2.4 Broadcast call termination.11
4.2.5 Acknowledgements .11
4.2.6 Transactions between the mobile station and the network .11
5 General architecture.12
5.1 Group Call Register (GCR).12
5.2 Voice broadcast call responsibility .13
6 Compatibility issues.13
7 Transmission.14
7.1 Transmission architecture.14
7.2 Radio channels .14
7.3 Data confidentiality.14
8 Information storage .15
8.1 Information stored in the GCR.15
8.1.1 Information used for routing of service subscriber originated voice
broadcast calls .15
8.1.2 Broadcast call attributes.15
8.1.2.1 Group call area .16
8.1.2.2 Dispatcher identities .16
8.1.2.3 Priorities.16
8.2 Information managed per subscriber.16
8.2.1 Stored in the HLR.16
8.2.2 Stored in the VLR .16
8.2.3 Stored in the SIM.17
8.3 Information used for routing of dispatcher originated broadcast calls .17
9 Identities .18
9.1 Elementary identities for broadcast calls .18
9.2 Use of identities in the network.18
10 Operation and maintenance aspects .19
11 Function and information flows .20

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11.1 Broadcast function management . 20
11.2 Group membership management . 20
11.3 Call management . 20
11.3.1 Call establishment . 20
11.3.1.1 Service subscriber call establishment. 20
11.3.1.1.1 Initial stage . 20
11.3.1.1.2 Establishment of the transmission
means . 21
11.3.1.1.3 Release of the dedicated transmission
means of mobile stations responding
to a notification . 21
11.3.1.2 Dispatcher call establishment . 22
11.3.1.3 Notification procedures . 22
11.3.1.4 Destination subscribers. 25
11.3.1.5 Called dispatchers. 25
11.3.2 Call release. 25
11.3.3 Leaving of a dispatcher. 25
11.3.4 Leaving and returning to a voice broadcast call of a service subscriber . 25
11.3.5 Cell change. 25
11.3.5.1 Listening subscriber . 25
11.3.5.2 Calling subscriber. 26
11.3.5.3 Dispatcher. 26
11.3.6 New calls . 26
11.3.7 Uplink transmission management . 26
11.3.8 Overview of signalling. 26
Annex A (informative): Status of GSM 03.69. 30
History. 31

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ETS 300 934 (GSM 03.69 version 5.1.2): May 1997
Foreword
This European Telecommunication Standard (ETS) has been produced by the Special Mobile Group
(SMG) Technical Committee (TC) of the European Telecommunications Standards Institute (ETSI).
This ETS specifies the stage two description of the Voice Broadcast Service (VBS) within the digital
cellular telecommunications system.
The contents of this ETS is subject to continuing work within TC-SMG and may change following formal
TC-SMG approval. Should TC-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): 31 August 1997
Date of latest publication of new National Standard
or endorsement of this ETS (dop/e): 28 February 1998
Date of withdrawal of any conflicting National Standard (dow): 28 February 1998

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1 Scope
This European Telecommunication Standard (ETS) specifies the stage 2 description of the Voice
Broadcast Service (VBS) which allows the distribution of speech (or other signals which can be
transmitted via the speech codec), generated by a service subscriber, into a predefined geographical area
to all or a group of service subscribers located in this area.
2 Normative references
This ETS incorporates by dated and undated references, 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 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 02.09 (ETS 300 920): "Digital cellular telecommunications system;
Security aspects".
[3] GSM 02.69 (ETS 300 926): "Digital cellular telecommunications system
(Phase 2+); Voice Broadcast Call Service (VBS) - Stage 1".
[4] GSM 03.20 (ETS 300 929): "Digital cellular telecommunications system;
Security related network functions".
[5] GSM 03.22 (ETS 300 930): "Digital cellular telecommunications system;
Functions related to Mobile Station (MS) in idle mode".
[6] GSM 03.67 (ETS 300 932): "Digital cellular telecommunications system
(Phase 2+); enhanced Multi-Level Precedence and Pre-emption service
(eMLPP) - Stage 2".
[7] GSM 04.08 (ETS 300 940): "Digital cellular telecommunications system
(Phase 2+); Mobile radio interface layer 3 specification".
[8] GSM 05.08 (ETS 300 911): "Digital cellular telecommunications system
(Phase 2+); Radio subsystem link control".
[9] GSM 08.08: "Digital cellular telecommunications system (Phase 2+); Mobile
Switching Centre - Base Station System (MSC - BSS) interface Layer 3
specification".
[10] CCITT Recommendation E.164: "Numbering plan for the ISDN era".

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3 Definitions and abbreviations
3.1 Definitions
Definitions used in this ETS are also defined in GSM 02.69.
Voice broadcast channel: Downlink to be allocated in each cell of the group call area for a particular
voice broadcast call. All mobile stations of the destination subscriber being service subscribers in one cell
shall listen to the common downlink.
Group members: Service subscribers entitled to belong to a particular group classified by a certain group
identification (group ID).
Voice broadcast call member: Any group member or dispatcher participating in an on going voice
broadcast call.
Broadcast call attributes: Group call area, dispatcher identities and acknowledgement destinations
applying to a voice broadcast call.
Group Call Register (GCR): A functionality in the network containing the broadcast call attributes.
Group call anchor MSC: The MSC responsible for managing and maintaining a particular voice
broadcast call. The group call anchor MSC is determined as the one controlling the cells of the group call
area. For voice broadcast services where the group call area exceeds an MSC area, the group call anchor
MSC is predefined in the network.
Group call relay MSC: MSC controlling cells of a group call area which are not under control of the group
call anchor MSC for those voice broadcast services where the group call area exceeds one MSC area.
Notification: Notifications are given on common channels or dedicated channels in order to inform group
members which are either in idle mode or in dedicated mode or participating in a voice group call or
broadcast call on the existence of voice broadcast calls.
Notification channel (NCH): Common control channel on which the notifications are sent by the network
(equivalent to a paging channel).
3.2 Abbreviations
Abbreviations used in this ETS are also listed in GSM 01.04.
eMLPP enhanced Multi-Level Precedence and Pre-emption
GCR Group Call Register
NCH Notification Channel
VBS Voice Broadcast Service
VGCS Voice Group Call Service

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4 Main concepts
4.1 Group definition
Service subscribers can become group members on a PLMN wide basis to one or more groups pre-
defined in the network by a corresponding group identification (group ID). The membership enables them
to receive voice broadcast calls associated with that group ID. In addition, certain group members are
entitled by their subscription to initiate voice broadcast calls. Certain dispatchers connected to external
networks also require the capability to initiate or receive voice broadcast calls.
In addition to subscriber details in the HLR, it is necessary for the mobile station to be aware of its group
membership by storing details on the SIM. This is required because it shall respond to notification
messages which include only the group ID (i.e. no IMSI or TMSI details).
Having become a group member, each service subscriber can set to active state or deactive state the
group ID or any one out of his several group IDs on the SIM. In active state the subscriber can initiate
voice broadcast calls to that group ID. When in deactive state the subscriber can not make voice
broadcast calls to the group and the mobile station ignores any notification for that group ID.
4.2 Broadcast process
4.2.1 Broadcast call initiation
4.2.1.1 Normal operation with successful outcome
A group call area can be restricted to a single MSC area or can exceed one MSC area (implementation
option).
A voice broadcast call shall be initiated by a calling subscriber by a related MMI action for the service
selection and the group ID dialled.
The MSC in which the voice broadcast call is initiated obtains (by requesting the Group Call Register
(GCR), see clause 5) the group call attributes.
When a calling subscriber initiates a voice broadcast call, one voice broadcast channel shall be
established in each cell of the group call area and notifications for that call shall be sent in each of these
cells. As an alternative, voice broadcast channels may only be established in cells in reaction to responses
received from mobile stations on the notifications. At the same time standard connections to dispatchers
in the mobile network or in an external network shall be established.
The calling subscriber shall have an dedicated standard uplink/downlink. All mobile stations of the
listening service subscribers in one cell shall only listen to the same common downlink (voice broadcast
channel).
Only one voice broadcast channel shall be established in each cell for any given voice broadcast call,
although there may be a number of simultaneous voice broadcast calls within the same cell.
Service subscribers shall be notified on the voice broadcast call in each cell. These voice broadcast call
notification messages shall be broadcast on the notification channel (NCH).
The notification messages use the group ID rather than individual TMSIs/IMSIs. Additionally, a group call
area identity (group call area ID) shall be included in order to enable a resolution in the case of
overlapping group call areas. A service subscriber's mobile station needs to be able to recognize
notification messages for those group IDs subscribed to and presently activated.
As a network option, messages are also sent on appropriate voice broadcast channel SACCHs or
FACCHs, in order to notify voice broadcast call members who may participate in other voice broadcast
calls. In addition, also paging information messages for standard calls may be sent in order to inform
voice broadcast call members on actually paged point-to-point calls.

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As a further network option, notification on the voice broadcast call shall be provided to service
subscribers which have subscribed to the paged group ID and which are in dedicated mode.
The ability to react on these notification and paging information messages which are provided into on-
going calls shall be a mobile station option. It shall be indicated to the mobile stations by the network if the
notification and paging information on the voice broadcast channel SACCH or FACCH is provided.
The process of broadcasting messages on NCHs and appropriate SACCHs or FACCHs is to be carried
out throughout the call in order to provide the "late entry" facility whereby group members entering the
area can join the call.
On receiving details of a voice broadcast call a voice broadcast call member's mobile station which is in
idle mode shall adjust to the nominated channel if this channel was received in the notification message
and receive the information on the downlink. Whilst receiving, the mobile station shall not transmit on the
uplink SACCH. This group receive mode is different to the normal idle mode or dedicated mode. If no
channel description was provided in the notification message, the mobile station shall establish a
dedicated connection in order to respond to the notification. The network may then provide the mobile
station with a channel description for the voice broadcast call.
4.2.1.2 Exceptional procedures
Completion of links into congested cells where pre-emption did not occur is required.
If the cell in which the calling service subscriber is located will be reset, the voice broadcast call shall be
released.
On receiving details of a voice broadcast call the user may choose to move to the notified call or the
mobile station may automatically move to the notified call if the new call is of higher priority than the
existing call and automatic acceptance applies for this priority level.
4.2.2 On-going broadcast calls
4.2.2.1 Normal operation with successful outcome
Within each voice broadcast call only the voice of the calling subscriber shall be transmitted on the voice
broadcast downlink channel.
As an implementation option, information shall be broadcast on the voice broadcast channel SACCH
concerning the voice broadcast call channel details in neighbour cells. Mobile stations in group receive
mode use a version of the standard idle mode procedures to "camp-on" to the voice broadcast channel in
a new cell. If this information on the neighbouring cells is not provided at all or only provided for cells in the
same BSC area, the mobile station may find the voice broadcast channel details of a new cell on the
related NCH.
A network may decide not to establish voice broadcast channels in all cells. Instead, notifications
containing no channel description may be provided. If a mobile station moves to such a cell, it must
respond to the notification in order to receive the voice broadcast call. The network may then establish a
voice broadcast channel and inform the mobile station on the channel position.
NOTE: Concerning security aspects, whilst authentication and membership checking of mobile
call originators can be carried out, it is not possible to authenticate service subscribers
in group receive mode if they have not before established a dedicated connection to
responded to a notification. No equivalent of a group "TMSI" is provided to protect the
"identity" of established voice broadcast calls.

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ETS 300 934 (GSM 03.69 version 5.1.2): May 1997
4.2.2.2 Exceptional procedures
If a mobile station in group receive mode indicates a failure due to radio link time-out, the mobile station
shall behave as specified in GSM 05.08 and go back to idle mode, possibly in another cell, as determined
by the cell re-selection algorithm. If a notification is received for the same cell, the mobile station shall try
to reconnect.
4.2.3 Leaving of a broadcast call without termination
A destination subscriber being service subscriber can leave the voice broadcast call at any point by
"deselecting" it via an MMI function. Having deselected the call the mobile station returns to idle mode and
"ignores" any further notification messages related to that call.
[Remark: If a service subscriber does not wish to participate in calls to a particular group ID for long
periods of time, the group ID shall be switched to deactive state by the subscriber.]
The service subscriber shall have the capability to reselect the voice broadcast call. The mobile station
shall not ignore notification messages to that call any more.
The dispatcher shall be able to leave a voice broadcast call without terminating it.
4.2.4 Broadcast call termination
A voice broadcast call can be terminated by the calling subscriber or an entitled dispatcher.
The call must not be maintained if the calling subscriber leaves the group call area (e.g. if he moves into
an MSC area where a group call area is no part of).
4.2.5 Acknowledgements
The acknowledgement is an application option.
For voice broadcast calls which are identified by an acknowledgement flag in the notification message
mobile stations which have acknowledgement facilities are informed that they have to return an
acknowledgement message with a predefined content in a predefined manner.
The flag is set on basis of the GCR data.
The acknowledgement shall be sent using an appropriate data service, to a predefined address or with a
predefined short code stored on the SIM card. The network may apply geographical routing to a
predefined acknowledgement service centre.
4.2.6 Transactions between the mobile station and the network
Mobile stations which are in broadcast receive mode shall not perform any transactions with the network
while adjusted to the voice broadcast channel. They shall leave the group receive mode and act in a
standard way to perform any transaction if necessary and return to the voice broadcast call afterwards.

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5 General architecture
5.1 Group Call Register (GCR)
The general architecture of GSM is maintained. In addition, a network function is required which is used for
registration of the broadcast call attributes, the Group Call Register (GCR).
The GCR function is mainly a database function, holding information about voice broadcast calls.
NOTE 1: The GCR implementation is not specified. It may be realized e.g. as a new network
node, in a PABX directly attached to an MSC, inside an MSC or as an HLR. The
interface between the GCR function and other functions is not specified in the GSM
technical specifications. As a consequence, the functional split between MSC and GCR
as developed in this ETS is only indicative, and other functional splits can be
implemented.
The GCR data for a specific voice broadcast call is set at the creation of the broadcast call attributes, and
can be subsequently modified. No support for these functions is specified in the GSM technical
specifications.
External network
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Figure 1: Functional architecture with a Group Call Register
The signalling between the entities shown in figure 1, for the two cases of service subscriber and
dispatcher originated calls, shall be as defined in the following.
Service subscriber originated: The MSC containing the cell within which this voice broadcast call is
initiated shall perform subscription checking against VLR records. It shall then consult its GCR to
determine the broadcast call attributes related to its MSC area and whether it is the group call anchor
MSC for that voice broadcast call. If it is not, the GCR shall provide with the broadcast call reference and
the routing information identifying the group call anchor MSC to the originating MSC. The originating MSC
shall then route the voice broadcast call to the anchor MSC. If the originating MSC is the group call anchor
MSC, along with the broadcast call attributes, the GCR shall provide information on all group call relay
MSCs to be involved.
The group call anchor MSC shall set up links to all group call relay MSCs. Each MSC involved in a voice
broadcast call obtains its proper broadcast call attributes from the GCR related to the MSC.
Dispatcher originated: In the case of dispatchers calling from an external network, the call request, in the
form of an ISDN number, shall be received at a GMSC. The number shall be passed to the appropriate
HLR, which shall pass the corresponding MSRN back to the GMSC referring to the group call anchor MSC
for the call. Alternatively, the voice broadcast request can be directly routed to the group call anchor MSC
by the GMSC based on the called identity without requesting an HLR. The group call anchor MSC shall
interrogate the GCR and obtain the broadcast call attributes. If an identical voice broadcast call is currently
in progress, the dispatcher shall be connected to this call and no new call shall be initiated. When
interrogating the GCR, the identity of the dispatcher is compared with the list of dispatchers to which a
dedicated link is to be established. If the dispatcher is not in the list, or an identity is not provided, the
network shall reject the call.

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