ETSI ETS 300 934 ed.4 (1998-10)

Digital cellular telecommunications system (Phase 2+) (GSM); Voice Broadcast Service (VBS); Stage 2 (GSM 03.69 version 5.4.1)

RE/SMG-030369QR3

Digitalni celični telekomunikacijski sistem (faza 2+) – Storitev govorne radiodifuzije (VBS) – Stopnja 2 (GSM 03.69, različica 5.4.1)

General Information

• Status: Published
• Publication Date: 22-Oct-1998
• Technical Committee: SMG 3 - Network Aspects
• Current Stage: 12 - Completion
• Due Date: 06-Nov-1998
• Completion Date: 23-Oct-1998
• Mandate: UIC
• Ref Project: SIST ETS 300 934 E4:2003 - Digital cellular telecommunications system (Phase 2+) (GSM); Voice Broadcast Service (VBS); Stage 2 (GSM 03.69 version 5.4.1)

Standards Content (Sample)

SLOVENSKI STANDARD
SIST ETS 300 934 E4:2003
01-december-2003
'LJLWDOQLFHOLþQLWHOHNRPXQLNDFLMVNLVLVWHPID]D±6WRULWHYJRYRUQH
UDGLRGLIX]LMH9%6±6WRSQMD*60UD]OLþLFD
Digital cellular telecommunications system (Phase 2+) (GSM); Voice Broadcast Service
(VBS); Stage 2 (GSM 03.69 version 5.4.1)
Ta slovenski standard je istoveten z: ETS 300 934 Edition 4
ICS:
33.070.50 Globalni sistem za mobilno Global System for Mobile
telekomunikacijo (GSM) Communication (GSM)
SIST ETS 300 934 E4:2003 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST ETS 300 934 E4:2003

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SIST ETS 300 934 E4:2003
EUROPEAN ETS 300 934
TELECOMMUNICATION October 1998
STANDARD Fourth Edition
Source: SMG Reference: RE/SMG-030369QR3
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 5.4.1)
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
Internet: [e-mail] - http://www.etsi.org
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 1998. All rights reserved.

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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 Standards Making 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 .17
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

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11 Function and information flows. 20
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 . 22
11.3.1.2 Dispatcher call establishment . 22
11.3.1.3 Notification procedures . 22
11.3.1.4 Destination subscribers. 24
11.3.1.5 Called dispatchers. 24
11.3.2 Call release. 24
11.3.3 Leaving of a dispatcher. 24
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. 25
11.3.5.3 Dispatcher. 25
11.3.6 New calls . 25
11.3.7 Uplink transmission management . 26
11.3.8 Overview of signalling. 26
11.4 Functional requirement of Anchor-MSC. 36
11.5 Functional requirement of Relay-MSC . 40
11.6 Functional requirement of GCR . 45
11.7 Functional requirement of VLR . 48
12 Content of messages. 50
12.1 Messages on the B interface (MSC-VLR). 50
12.1.1 Allocate Group Call Number. 50
12.1.2 Allocate Group Call Number ack . 50
12.1.3 Allocate Group Call Number negative response. 50
12.1.4 Release Group Call Number. 50
12.2 Messages on the E interface (MSC-MSC). 50
12.2.1 Prepare Group Call. 50
12.2.2 Prepare Group Call ack . 51
12.2.3 Prepare Group Call negative response . 51
12.2.4 Send Group Call End Signal. 51
12.3 Messages on the I interface (MSC-GCR) . 51
12.3.1 GCR Interrogation. 51
12.3.2 GCR Interrogation ack. 51
12.3.3 GCR interrogation negative response . 52
12.3.4 Call released. 52
Annex A (informative): Status of GSM 03.69. 53
History. 54

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Foreword
This European Telecommunication Standard (ETS) has been produced by the Special Mobile Group
(SMG) of the European Telecommunications Standards Institute (ETSI).
This specification specifies the stage two description of the Voice Broadcast Service (VBS) within the
digital cellular telecommunications system.
The contents of this specification is subject to continuing work within SMG and may change following
formal SMG approval. Should SMG modify the contents of this specification, it will be resubmitted for UAP
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 of this ETS: 23 October 1998
Date of latest announcement of this ETS (doa): 31 January 1999
Date of latest publication of new National Standard
or endorsement of this ETS (dop/e): 31 July 1999
Date of withdrawal of any conflicting National Standard (dow): 31 July 1999

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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 specification 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 specification 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 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-
services 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 specification 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.
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 (see also group call relay MSC). 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 specification are also listed in GSM 01.04.
For the purpose of this specification, the following abbreviations apply:
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.
This GCR interrogation after call initiation also determines whether the MSC shall act as anchor- or as
relay MSC. If the MSC is not the anchor-MSC then the call will be "forwarded" from the relay to the
respective anchor-MSC (information also delivered by GCR) and further "call-establishment" is done by
the anchor-MSC as described in the following.
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.

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The network may also send messages on appropriate voice broadcast channel 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.
Further the network may provide notification on the voice group call to service subscribers who have
subscribed to the paged group ID and which are in dedicated mode.
The process of broadcasting messages on NCHs 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 notification of a voice broadcast call a voice broadcast call member's mobile station shall
adjust to the nominated channel to receive the broadcast call 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.
As a further mobile station option, the mobile station may read its paging subchannel in the current cell
while in group receive mode or in group transmit mode in order to receive paging messages for mobile
terminated calls.
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 is 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.
Mobile stations in group receive mode use the group receive mode procedure (see GSM 03.22) to "camp-
on" in a new cell to be able to listen to the voice broadcast channel. 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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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.
NOTE: 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 mobile stations which have
acknowledgement facilities have to return an acknowledgement message with a predefined content in a
predefined manner.
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 specification 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
External network
HLR GMSC
Anchor
VLR GCR
MSC
VLR Relay GCR
MSC
VLR Relay GCR
MSC
Figure 1: Functional architecture with a Group Call Register
The signalling between the entities shown in figure 1, for the two cases of s
...