ETSI TS 123 041 V8.11.0 (2013-01)

Digital cellular telecommunications system (Phase 2+); Universal Mobile Telecommunications System (UMTS); Technical realization of Cell Broadcast Service (CBS) (3GPP TS 23.041 version 8.11.0 Release 8)

RTS/TSGC-0123041v8b0

General Information

• Status: Published
• Publication Date: 15-Jan-2013
• Technical Committee: 3GPP CT 1 - MM/CC/SM [lu] (formely CN1)
• Current Stage: 12 - Completion
• Due Date: 02-Jan-2013
• Completion Date: 16-Jan-2013

Standards Content (Sample)

Technical Specification
Digital cellular telecommunications system (Phase 2+);
Universal Mobile Telecommunications System (UMTS);
Technical realization of Cell Broadcast Service (CBS)
(3GPP TS 23.041 version 8.11.0 Release 8)

R
GLOBAL SYSTEM FOR
MOBILE COMMUNICATIONS
3GPP TS 23.041 version 8.11.0 Release 8 1 ETSI TS 123 041 V8.11.0 (2013-01)

Reference
RTS/TSGC-0123041v8b0
Keywords
GSM,UMTS
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ETSI
3GPP TS 23.041 version 8.11.0 Release 8 2 ETSI TS 123 041 V8.11.0 (2013-01)
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://ipr.etsi.org).
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 3rd Generation Partnership Project (3GPP).
The present document may refer to technical specifications or reports using their 3GPP identities, UMTS identities or
GSM identities. These should be interpreted as being references to the corresponding ETSI deliverables.
The cross reference between GSM, UMTS, 3GPP and ETSI identities can be found under
http://webapp.etsi.org/key/queryform.asp.
ETSI
3GPP TS 23.041 version 8.11.0 Release 8 3 ETSI TS 123 041 V8.11.0 (2013-01)
Contents
Intellectual Property Rights . 2
Foreword . 2
Foreword . 5
1 Scope . 6
1.1 References . 6
1.2 Abbreviations . 7
2 General description. 7
3 Network Architecture . 8
3.1 GSM Network Architecture . 8
3.2 UMTS Network Architecture . 9
3.3 EPS Network Architecture . 10
4 CBE Functionality . 10
5 CBC Functionality . 10
6 BSC/RNC Functionality . 11
7 BTS Functionality . 11
8 MS/UE Functionality . 11
9 Protocols and Protocol Architecture . 12
9.1 Requirements on Core Network and Radio Access Network . 12
9.1.1 GSM Radio Access Network . 12
9.1.2 UMTS Radio Access Network. 14
9.1.3 Warning Message Delivery. 15
9.1.3.1 General . 15
9.1.3.2 Warning Message Delivery Procedure in GSM . 15
9.1.3.3 Warning Message Delivery Procedure in UMTS . 17
9.1.3.4 Warning Message Delivery Procedure in E-UTRAN . 18
9.1.3.4.1 General . 18
9.1.3.4.2 Warning Message Delivery Procedure . 18
9.1.4 UMTS Protocol Overview . 21
9.1.5 E-UTRAN Protocol Overview . 21
9.2 Requirements on the CBC-interfaces CBC-BSC and CBC-RNC . 21
9.2.1 Identification of a CBS message . 22
9.2.2 WRITE-REPLACE Request/Indication . 23
9.2.3 KILL Request/Indication . 24
9.2.4 REPORT Response/Confirm . 25
9.2.5 STATUS-LOAD-QUERY Request/Indication . 25
9.2.6 STATUS-LOAD-QUERY Response/Confirm . 25
9.2.7 STATUS-MESSAGE-QUERY Request/Indication . 26
9.2.8 STATUS-MESSAGE-QUERY Response/Confirm . 26
9.2.9 REJECT Response/Confirm . 26
9.2.10 RESTART-INDICATION Request/Indication . 26
9.2.11 RESET Request/Indication . 27
9.2.12 FAILURE-INDICATION Request/Indication . 27
9.2.13 SET-DRX Request/Indication . 27
9.2.14 SET-DRX- REPORT Response/Confirm . 28
9.2.15 CAPACITY-INDICATION Request/Indication . 28
9.3 Parameters . 28
9.3.1 Message-Identifier . 28
9.3.2 Old-Serial-Number . 28
9.3.3 New-Serial-Number . 28
9.3.4 Number-of-Pages . 29
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9.3.5 Cell-List . 29
9.3.5.1 Cell-List sent from CBC to BSC/RNC. 29
9.3.5.2 Cell-List sent from BSC/RNC to CBC. 30
9.3.6 Channel Indicator . 30
9.3.7 Category . 30
9.3.8 Repetition-Period . 30
9.3.9 No-of-Broadcasts-Requested . 30
9.3.10 No-of-Broadcasts-Completed-List . 30
9.3.11 Cell-Identifier . 31
9.3.12 Schedule-Period . 31
9.3.13 Reserved-Slots . 32
9.3.14 Failure-List . 32
9.3.15 Radio-Resource-Loading-List. 32
9.3.16 Cause . 33
9.3.17 Diagnostic . 33
9.3.18 Data Coding Scheme . 33
9.3.19 CBS-Message-Information-Page n . 33
9.3.19.1 Identification of a directory number within a CBS-Message-Information-Page . 34
9.3.20 CBS-Message-Information-Length n . 34
9.3.21 Recovery-Indication. 34
9.3.22 Available-Capacity . 34
9.3.23 Paging-ETWS-Indicator . 34
9.3.24 Warning-Type . 34
9.3.25 Warning-Security-Information . 35
9.4 Message Format on the Radio Network – MS/UE Interface . 36
9.4.1 GSM. 36
9.4.1.1 General Description . 36
9.4.1.2 Message Parameter. 36
9.4.1.2.1 Serial Number . 36
9.4.1.2.2 Message Identifier . 38
9.4.1.2.3 Data Coding Scheme . 41
9.4.1.2.4 Page Parameter . 41
9.4.1.2.5 Content of Message . 41
9.4.1.3 ETWS Primary Notification message . 41
9.4.1.3.1 General Description . 41
9.4.1.3.2 Message Parameter . 41
9.4.1.3.3 Serial Number . 41
9.4.1.3.4 Message Identifier . 41
9.4.1.3.5 Warning Type . 42
9.4.1.3.6 Warning Security Information . 42
9.4.2 UMTS . 42
9.4.2.1 General Description . 42
9.4.2.2 Message Parameter. 42
9.4.2.2.1 Message Type . 42
9.4.2.2.2 Message ID . 42
9.4.2.2.3 Serial Number . 43
9.4.2.2.4 Data Coding Scheme . 43
9.4.2.2.5 CB Data . 43
9.5 CBS Compression . 43
10 CBS Index . 44
Annex A (informative): Protocols for interconnecting CBC and BSC . 47
Annex B (informative): Change history . 48
History . 50

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3GPP TS 23.041 version 8.11.0 Release 8 5 ETSI TS 123 041 V8.11.0 (2013-01)
Foreword
rd
This Technical Specification (TS) has been produced by the 3 Generation Partnership Project (3GPP).
The contents of the present document are subject to continuing work within the TSG and may change following formal
TSG approval. Should the TSG modify the contents of the present document, it will be re-released by the TSG with an
identifying change of release date and an increase in version number as follows:
Version x.y.z
where:
x the first digit:
1 presented to TSG for information;
2 presented to TSG for approval;
3 or greater indicates TSG approved document under change control.
y the second digit is incremented for all changes of substance, i.e. technical enhancements, corrections,
updates, etc.
z the third digit is incremented when editorial only changes have been incorporated in the document.
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3GPP TS 23.041 version 8.11.0 Release 8 6 ETSI TS 123 041 V8.11.0 (2013-01)
1 Scope
The present document describes the Cell Broadcast short message service (CBS) for GSM and UMTS.
For GSM it defines the primitives over the Cell Broadcast Centre - Base Station System (CBC-BSS) interface and the
message formats over the Base Station System - Mobile Station (BSS-MS) interface for Teleservice 23 as specified in
3GPP TS 22.003 [2].
For UMTS it defines the interface requirements for the Cell Broadcast Center – UMTS Radio Network System (RNS)
interface and the radio interface requirements for UMTS Radio Acces Networks to support CBS as specified in
3GPP TS 22.003 [2].
The present document also describes the Public Warning System (PWS) for GSM, UMTS and E-UTRAN, see
3GPP TS 22.168 [24].
1.1 References
The following documents contain provisions which, through reference in this text, constitute provisions of the present
document.
• References are either specific (identified by date of publication, edition number, version number, etc.) or
non-specific.
• For a specific reference, subsequent revisions do not apply.
• For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including
a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same
Release as the present document.
[1] Void
[2] 3GPP TS 22.003: "Circuit Teleservices supported by a Public Land Mobile Network (PLMN)".
[3] 3GPP TS 23.038: "Alphabets and language-specific information".
[4] 3GPP TS 23.040: "Technical realization of the Short Message Service (SMS)".
[5] 3GPP TR 03.47 Version 7.0.0: "Digital cellular telecommunication system (Phase 2+); Example
protocol stacks for interconnecting Service Centre(s) (SC) and Mobile-services Switching
Centre(s) (MSC)".
[6] 3GPP TR 03.49 Version 7.0.0: "Digital cellular telecommunication system (Phase 2+); Example
protocol stacks for interconnecting Cell Broadcast Centre (CBC) and Base Station Controler
(BSC)".
[7] 3GPP TS 44.012: "Short Message Service Cell Broadcast (SMSCB) support on the mobile radio
interface".
[8] 3GPP TS 45.002: "Multiplexing and multiple access on the radio path".
[9] 3GPP TS 27.005: "Use of Data Terminal Equipment - Data Circuit terminating Equipment (DTE -
DCE) interface for Short Message Service (SMS) and Cell Broadcast Service (CBS)".
[10] 3GPP TS 48.052: "Base Station Controller - Base Transceiver Station (BSC - BTS) interface;
Interface principles".
[11] 3GPP TS 48.058: "Base Station Controller - Base Transceiver Station (BSC - BTS) interface;
Layer 3 specification".
[12] ITU-T Recommendation X.210: "Information technology - Open systems interconnection - Basic
Reference Model: Conventions for the definition of OSI services".
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[13] 3GPP TS 48.008: "Mobile-services Switching Centre - Base Station System (MSC-BSS) interface;
Layer 3 specification".
[14] 3GPP TS 23.042: "Compression algorithm for text messaging services".
[15] 3GPP TS 23.048: "Security Mechanisms for the SIM application toolkit; Stage 2".
[16] 3GPP TS 25.331: "Radio Resource Control (RRC); Protocol specification".
[17] 3GPP TS 25.401: "UTRAN Overall Description".
[18] 3GPP TS 31.102: "Characteristics of the USIM Application".
[19] 3GPP TS 25.324: "Broadcast/Multicast Control BMC".
[20] 3GPP TR 21.905: "Vocabulary for 3GPP Specifications".
[21] 3GPP TR 25.925: "Radio Interface for Broadcast/Multicast Services".
[22] 3GPP TS 22.042: "Network Identity and Time Zone (NITZ) service description; Stage 1".
[23] 3GPP TS 24.008: "Mobile radio interface Layer 3 specification; Core network protocols; Stage 3".
[24] 3GPP TS 22.168: "Earthquake and Tsunami Warning System (ETWS) requirements".
[25] GSMA AD.26: "Coding of Cell Broadcast Functions".
[26] 3GPP TS 44.018: "Mobile radio interface layer 3 specification; Radio Resource Control Protocol".
[27] 3GPP TS 44.060: "General Packet Radio Service (GPRS); Mobile Station (MS) - Base Station
System (BSS) interface; Radio Link Control / Medium Access Control (RLC/MAC) protocol".
[28] Void.
[29] Void.
[30] Void.
[31] Void.
[32] Void.
[33] IETF RFC 4960: "Stream Control Transmission Protocol".
[34] 3GPP TS 36.413: "Evolved Universal Terrestrial Radio Access Network (E-UTRAN); S1
Application Protocol (S1AP)".
[35] 3GPP TS 29.168: "Cell Broadcast Centre interfaces with the Evolved Packet Core; Stage 3".
[36] 3GPP TS 36.331: "Evolved Universal Terrestrial Radio Access (E-UTRA); Radio Resource
Control (RRC); Protocol specification".
1.2 Abbreviations
For the purposes of the present dcoument, the abbreviations used are listed in 3GPP TR 21.905 [20].
2 General description
The CBS service is analogous to the Teletex service offered on television, in that like Teletex, it permits a number of
unacknowledged general CBS messages to be broadcast to all receivers within a particular region. CBS messages are
broadcast to defined geographical areas known as cell broadcast areas. These areas may comprise of one or more cells,
or may comprise the entire PLMN. Individual CBS messages will be assigned their own geographical coverage areas by
mutual agreement between the information provider and the PLMN operator. CBS messages may originate from a
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number of Cell Broadcast Entities (CBEs), which are connected to the Cell Broadcast Centre. CBS messages are then
sent from the CBC to the cells, in accordance with the CBS's coverage requirements.
A CBS page comprises of 82 octets, which, using the default character set, equates to 93 characters. Other Data Coding
Schemes may also be used, as described in 3GPP TS 23.038 [3]. Up to 15 of these pages may be concatenated to form a
CBS messagee. Each page of such CBS message will have the same message identifier (indicating the source of the
message), and the same serial number. Using this information, the MS/UE is able to identify and ignore re-broadcasts of
already received messages.
CBS messages are broadcast cyclically by the cell at a frequency and for a duration agreed with the information
provider. The frequency at which CBS messages are repeatedly transmitted will be dependent on the information that
they contain; for example, it is likely that dynamic information such as road traffic information, will require more
frequent transmission than weather information. The repetition period will also be affected by the desire for CBS
messages to be received by high speed mobiles which rapidly traverse cells.Reception of CBS messages for a MS/UE is
not a requirement if it is connected in the CS domain. It should be possible for a UE to receive messages if it is
connected in the PS domain and no data is currently transmitted.
CS-Domain CS-Connected CS-Idle CS-Idle
PS-Domain - PS-Idle PS-Connected
Reception of CBS Not possible Possible Depends on RRC
Message mode
NOTE: In case the UE is in CS-Idle and PS-Connected Mode it depends on the Radio Resource Control State
whether reception of CBS messages is possible. The relevant states are described in
3GPP TS 25.331 [16].
GSM only [CBS messages may be broadcast on two different cell broadcast channels, which are characterized by
different QoS. A MS is always able to read the basic channel (see 3GPP TS 45.002 [8]). The reading of the extended
channel may collide with other tasks of the MS. Therefore the probability of receiving a CBS message on the extended
channel is smaller than on the basic channel. The reading of the extended channel for MSs is optional. The scheduling
on the channels will be done independently].
To permit mobiles to selectively display only those CBS messages required by the MS/UE user, CBS messages are
assigned a message class which categorises the type of information that they contain and the language (Data Coding
Scheme) in which the CBS message has been compiled. Through the use of appropriate MMI, the user is then able to
ignore message types that he does not wish to receive, e.g. advertising information or messages in an unfamiliar
language.
A network may be able to remotely activate mobile terminals in order to enable them to receive CBS messages,
according to regulatory requirements (see 3GPP TS 25.331 [16]).
PWS provides a service that allows the network to distribute warning messages on behalf of public authority. PWS
enables the distribution of ETWS warning messages in GSM, UMTS and E-UTRAN.
Some of the PWS warning message distribution mechanisms are access technology specific, but for GSM and UMTS
there is also a common part using CBS procedures and related message structures, and for E-UTRAN CBS related
message structures are used.
3 Network Architecture
The chosen network architectures differ for GSM, UMTS and EPS. In subclause 3.1 the GSM network architecture is
descripted, in subclause 3.2 the UMTS network architecture and in subclause 3.3 the EPS network architecture.
3.1 GSM Network Architecture
The basic network structure of CBS is depicted by figure 1.
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outside scope of GSM Specs. inside scope of GSM Specs.
BTSs
3 4
MSs
1 3 4
CBE
2 MSs
BSC
CBC 3 4
MSs
CBE 1 2
Figure 1
- message transfer on link 1 is outside the scope of GSM Specifications;
- message transfer on link 2 is described in subclause 9.1;
- message transfer on link 3 is described in 3GPP TS 48.058 [11];
- message transfer on link 4 is described in 3GPP TS 44.012 [7] and the timing of messages transferred on link 4
is described in 3GPP TS 45.002 [8].
3.2 UMTS Network Architecture
The basic network structure of CBS is depicted by figure 2.

UTRAN
Cell
Node B
UE
Broadcast
RNC
CBE
Centre
Node B
UE
(CBC)
Iub
Uu IuBc
Figure 2
The basic network structure replaces the GSM BSS with the UTRAN containing the RNC and the Node B. The cell
broadcast center (CBC) is part of the core network and connected to a routing node e.g. a 3G SGSN via the Bc
reference point. Thus the CBC can reach every RNC via the user plane of the Iu interface. On the logical interface
between the CBC and the RNC a mandatory protocol shall be defined. The other UTRAN related interfaces are
described in the according UTRAN specifications based on the RAN 2 3GPP TR 25.925 [21]. Based on this
architecture and the current requirements for cell broadcast the core network elements like MSC, VLR, HLR etc are not
involved for the service delivery.
The CBE and the interface between CBE and CBC are out of scope of 3GPP specifications.
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3.3 EPS Network Architecture
The basic network structure of PWS architecture in E-UTRAN is depicted by figure 3.3-1.

UE
eNodeB MME CBC CBE
LTE-Uu
S1-MME SBc
Figure 3.3-1: PWS architecture
The cell broadcast centre (CBC) is part of the core network and connected to the MME via the SBc reference point. The
interface between the CBC and the MME is described in 3GPP TS 29.168 [35] and the interface between the MME and
the eNodeB is described in 3GPP TS 36.413 [34].
The CBE and the interface between CBE and CBC are out of scope of 3GPP specifications.
4 CBE Functionality
The functionality of the CBE is outside of the scope of GSM and UMTS Specifications; however it is assumed that the
CBE is responsible for all aspects of formatting CBS, including the splitting of a CBS message into a number of pages.
5 CBC Functionality
GSM only [As in GSM the CBC (and any originating point for CBS messages) is regarded as a node outside the PLMN,
only the requirements placed upon the CBC by CBS functionality are specified by the present document.
In UMTS the CBC is regarded to be integrated as a node into the core network.
The CBC may be connected to several BSCs/RNCs. The CBC may be connected to several CBEs. The CBC shall be
responsible for the management of CBS messages including:
- allocation of serial numbers;
- modifying or deleting CBS messages held by the BSC/RNC;
- initiating broadcast by sending fixed length CBS messages to a BSC/RNC for each language provided by the
cell, and where necessary padding the pages to a length of 82 octets (see 3GPP TS 23.038 [3]);
- determining the set of cells to which a CBS message should be broadcast, and indicating within the Serial
Number the geographical scope of each CBS message;
- determining the time at which a CBS message should commence being broadcast;
- determining the time at which a CBS message should cease being broadcast and subsequently instructing each
BSC/RNC to cease broadcast of the CBS message;
- determining the period at which broadcast of the CBS message should be repeated;
- determining the cell broadcast channel, on which the CBS message should be broadcast.
- when CBS transmits emergency messages, allocation of "emergency indication" to differentiate it from normal
CBS messages, including the "Cell ID/Service Area ID list" , "warning type", "warning message". If "warning
type" is of 'test', only UEs which are specially designed for testing purposes may display warning message.
To work efficiently on the interfaces, the BSC/RNC - which is normally controlling more than one cell of a broadcast
area - should be used as a concentrator as far as CBS message handling is concerned. Hence, the CBC should work on
lists of cells when issuing CB related requests towards the BSC/RNC.
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6 BSC/RNC Functionality
The BSC/RNC shall interface to only one CBC. A BSC may interface to several BTSs as indicated by
3GPP TS 48.052 [10]. A RNC may interface to several Node Bs.
The BSC/RNC shall be responsible for:
BSC RNC
interpretation of commands from the CBC;
storage of CBS messages;
scheduling of CBS messages on the CBCH; Scheduling of CBS messages on the CBS
related radio resources
providing an indication to the CBC when the desired repetition period cannot be achieved;
Providing to the CBC acknowledgement of successful execution of commands received from the
CBC;
Reporting to the CBC failure when a command received from the CBC is not understood or cannot
be executed;
routing CBS messages to the appropriate Routing CBS messages
BTSs;
Transferring CBS information to each The Node B has no functionality regarding
appropriate BTS via a sequence of 4 SMS CBS. This implies that CBS messages do not
BROADCAST REQUEST messages or 1 have to be transmitted explicitely to the Node
SMS BROADCAST COMMAND message Bs for further processing.
(see 3GPP TS 08.58 [11]), indicating the
channel which shall be used.
optionally generating Schedule Messages, Generating Schedule Messages, indicating the
indicating the intended schedule of intended schedule of transmissions (see
transmissions (see 3GPP TS 44.012 [7]); 3GPP TS 25.324 [19]). The conversion of GSM
related CB DRX Information is a function of the
RNC (3GPP TS 25.401 [17]).
optionally receiving CBCH Load Indication not applicable
messages and reacting by broadcasting a
burst of scheduled CBS messages or by
suspending the broadcast for a period
indicated by BTS (see 3GPP TS 48.058 [11]);
Broadcasting the ETWS Primary Notification Sending paging messages to mobile terminals
message upon receipt of the WRITE-REPLACE upon receiving CBS transmission request from
message including the Paging-ETWS-Indicator. CBC including the Paging-ETWS-Indicator.
The ETWS Primary Notification message is Emergency indication can be included in the
broadcasted continuously until the CBC requests paging messages, based on the warning type
otherwise. information conveyed from CBC.

To work efficiently on the interfaces, the BSC/RNC should forward CB related messages to the CBC using cell lists as
far as applicable.
7 BTS Functionality
Only GSM [The BTS is responsible for conveying CBS information received via SMS BROADCAST REQUEST or
SMS BROADCAST COMMAND messages over the radio path to the MS.
- optionally generating CBCH Load Indication messages, indicating an underflow or overflow situation on the
CBCH (see 3GPP TS 48.058 [11]).
8 MS/UE Functionality
Only GSM [The MS is responsible for recombination of the blocks received via the radio path to reconstitute the CBS
message.]
The precise method of display of CBS messages is outside the scope of GSM Specifications, however it is assumed that
an MS/UE will:
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MS UE
discard sequences transferred via the radio Discard corrupt CBS messages received on the
path (see 3GPP TS 44.012 [7]) which do not radio interface
consist of consecutive blocks;
have the ability to discard CBS information which is not in a suitable data coding scheme;
Have the ability to discard a CBS message which has a message identifier indicating that it is of
subject matter which is not of interest to the MS;
Have the ability to ignore repeat primary warning notifications and repeat broadcasts of CBS
messages already received (message has not changed since it was last broadcast e.g. sequence
number has not changed within the message's indicated geographical area), and also if the
MS/UE changes its radio access (e.g. from UTRAN to GERAN) and receives the same
information;
With regard to duplication detection, primary warning notifications and CBS messages are treated
separately, even if the duplication detection is based on the same parameters (e.g. the
combination of message identifier and sequence number)
have the ability to transfer a CBS message to an external device, when supported ;
optionally enter CBS DRX mode based upon Enter CBS DRX mode based upon received
received Schedule Messages (see Schedule Messages (see 3GPP TS 25.324 [19])
3GPP TS 44.012 [7]);
optionally skip reception of the remaining not applicable
block(s) of a CBS message which do(es) not
contain cell broadcast information (see
3GPP TS 44.012 [7]);
Optionally read the extended channel Not applicable for UMTS.
enable the user to activate/deactivate CBS through MMI
Enable the user to maintain a "search list" and receive CBS messages with a Message Identifier in
the list while discarding CBS messages with a Message Identifier not in the list
allow the user to enter the Message Identifier via MMI only for the 1 000 lowest codes
be capable of receiving CBS messages consisting of up to 15 pages
When emergency indication is included in the received paging and/or CBS message, behave as
specified in 3GPP TS 22.168 [24];
If the emergency indication includes the value for 'test', mobile terminals which are not used for
testing purpose silently discard the paging message and do not receive the corresponding CBS
message.
9 Protocols and Protocol Architecture
9.1 Requirements on Core Network and Radio Access Network
9.1.1 GSM Radio Access Network
Commands interpreted by the BSC will result in a sequence of 4 SMS BROADCAST REQUEST messages or 1 SMS
BROADCAST COMMAND message being sent to a BTS, which in turn result in a sequence of 4 blocks each 22 octets
long being transferred via the BTS-MS interface (see 3GPP TS 44.012 [7]).
With the SMS BROADCAST REQUEST mode of operation, the 88 octet fixed length CBS page which is specified in
subclause 9.3 is split into four 22 octet blocks which are carried in SMS BROADCAST REQUEST messages as
follows:
st
octets 1-22 are transferred in the 1 SMS BROADCAST REQUEST
with a sequence number (see 3GPP TS 44.012 [7]) indicating first block;

nd
octets 23-44 are transferred in the 2 SMS BROADCAST REQUEST
with a sequence number (see 3GPP TS 44.012 [7]) indicating second block;

rd
octets 45-66 are transferred in the 3 SMS BROADCAST REQUEST
with a sequence number (see 3GPP TS 44.012 [7]) indicating third block;

th
octets 67-88 are transferred in the 4 SMS BROADCAST REQUEST
with a sequence number (see 3GPP TS 44.012 [7]) indicating fourth block.
ETSI
3GPP TS 23.041 version 8.11.0 Release 8 13 ETSI TS 123 041 V8.11.0 (2013-01)
Figure 3 illustrates the protocol architecture and the scope of the various GSM Specifications for the SMS
BROADCAST REQUEST mode of operation.
TS 23.041
TS 23.041 Section 9.4
Section 9.2
TS 48.058 TS 24.012
CBC BSC BTS MSs
Write-Replace
SMS BROADCAST REQUEST 1
Report-Success
SMS BROADCAST REQUEST 2
SMS BROADCAST REQUEST 3
SMS BROADCAST REQUEST 4
Figure 3
With the SMS BROADCAST COMMAND mode of operation, the BSC sends to the BTS in one single message the
88 octet fixed length CBS page. The BTS then splits the page into four 22 octet blocks, adds the sequence number
(see 3GPP TS 44.012 [7]) and transmits the four resulting blocks on the air.
Figure 4 illustrates the protocol architecture and the scope of the various GSM Specifications for the SMS
BROADCAST COMMAND mode of operation.
ETSI
3GPP TS 23.041 version 8.11.0 Release 8 14 ETSI TS 123 041 V8.11.0 (2013-01)
TS 23.041
TS 23.041 Section 9.4
Section 9.2
TS 48.058 TS 24.012
CBC BSC BTS MSs
Write-Replace
SMS BROADCAST COMMAND
Report-Success
Figure 4
9.1.2 UMTS Radio Access Network
Commands interpreted by the RNC will result in one SMS BROADCAST COMMAND sent to the UE. The CBS
messages are completely transparent to the Node B, i.e. no manipulation of the data like e.g. fragmentation is done at
the Node B.
3G TS 23.041
3G TS 23.041 Section 9.4
Section 9.2
3G TS 25.324
UEs
CBC RNC NODE-B
Write-Replace
SMS BROADCAST COMMAND
Report-Success
Figure 4a
ETSI
3GPP TS 23.041 version 8.11.0 Release 8 15 ETSI TS 123 041 V8.11.0 (2013-01)
9.1.3 Warning Message Delivery
9.1.3.1 General
In GSM and UMTS, the cell broadcast service can be used to transfer CBS messages related to public warning. This
requires reception of CBS messages to be permanently activated in the mobile terminal.
Warning message delivery is similar to cell broadcast service. It permits a number of unacknowledged warning
messages to be broadcast to MS/UEs within a particular area. Reception of warning messages is enabled as defined later
on in this specification.
In GSM, an ETWS capable MS uses the procedure as outlined in subclause 9.1.3.2. See 3GPP TS 44.018 [26] and
3GPP TS 44.060 [27] for details on the radio interface.
In UMTS, an ETWS capable UE uses the procedure as outlined in subclause 9.1.3.3. See 3GPP TS 25.331 [16] for
details on the radio interface.
In E-UTRAN, an ETWS capable UE uses the procedures as outlined in subclause 9.1.3.4. See 3GPP TS 36.331 [36] for
details on the radio interface.
9.1.3.2 Warning Message Delivery Procedure in GSM
When a warning message is sent in GERAN, the following message flow applies. The warning message request from
the CBE will trigger a broadcast of an ETWS Primary Notification and/or a CBS message (constituting a Secondary
Notification) on the radio interface. The ETWS Primary Notification is conveyed by the paging message which can
invoke mobile terminals to start receiving CBS messages without MMI. Mobile stations invoked to start receiving CBS
messages this way may stop receiving CBS messages (wi
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