SIST ETS 300 943 E1:2003

SLOVENSKI STANDARD
SIST ETS 300 943 E1:2003
01-december-2003
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Digital cellular telecommunications system (Phase 2+) (GSM); Short Message Service
Cell Broadcast (SMSCB) support on the mobile radio interface (GSM 04.12 version
5.0.2)
Ta slovenski standard je istoveten z: ETS 300 943 Edition 1
ICS:
33.070.50 Globalni sistem za mobilno Global System for Mobile
telekomunikacijo (GSM) Communication (GSM)
SIST ETS 300 943 E1:2003 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST ETS 300 943 E1:2003

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SIST ETS 300 943 E1:2003
EUROPEAN ETS 300 943
TELECOMMUNICATION April 1997
STANDARD
Source: ETSI TC-SMG Reference: DE/SMG-030412Q
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+);
Short Message Service Cell Broadcast (SMSCB)
support on the mobile radio interface
(GSM 04.12 version 5.0.2)
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 300 943 (GSM 04.12 version 5.0.2): April 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
1.1 Normative references .7
1.2 Abbreviations .7
2 General description .7
2.1 Scheduling Information .8
3 Message format on BTS-MS Interface.8
3.1 General .8
3.2 Format convention .9
3.2.1 Numbering convention .9
3.2.2 Order of bit transmission .9
3.3 Block content .9
3.3.1 Block Type.10
3.4 SMSCB Message.10
3.5 Schedule Message .11
3.5.1 Header.11
3.5.2 New CBSMS Message Bitmap.12
3.5.3 New CBSMS Message Description.12
3.5.4 Other Message Descriptions.12
3.5.5 Message description encoding.13
3.5.5.1 First transmission of an SMSCB within the Schedule
Period .13
3.5.5.2 Retransmission indication.14
3.5.5.3 Free Message Slot, optional reading.14
3.5.5.4 Free Message Slot, reading advised .14
3.5.5.5 Reserved Codepoints .14
Annex A (informative): Sample Implementation of SMSCB DRX Mode .15
History.17

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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 describes how the Short Message Service Cell Broadcast (SMSCB) is supported over the
mobile radio interface within the digital cellular telecommunications system (Phase 2+).
This ETS is a GSM technical specification version 5, which incorporates GSM Phase 2+
enhancements/features to the version 4 GSM technical specification. The ETS from which this Phase 2+
ETS has evolved is Phase 2 GSM ETS 300 560 Edition 3 (GSM 04.12 version 4.6.0).
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.
The specification from which this ETS has been derived was originally based on CEPT documentation,
hence the presentation of this ETS may not be entirely in accordance with the ETSI drafting rules.
Transposition dates
Date of adoption: 28 March 1997
Date of latest announcement of this ETS (doa): 31 July 1997
Date of latest publication of new National Standard
or endorsement of this ETS (dop/e): 31 January 1998
Date of withdrawal of any conflicting National Standard (dow): 31 January 1998

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1 Scope
This European Telecommunication Standard (ETS) describes how the Short Message Service Cell
Broadcast (SMSCB) (Teleservice 23 as specified in GSM 02.03) is supported over the mobile radio
interface.
1.1 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 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 02.03 (ETS 300 905): "Digital cellular telecommunications system
(Phase 2+); Teleservices supported by a GSM Public Land Mobile Network
(PLMN)".
[3] GSM 03.41 (ETS 300 902): "Digital cellular telecommunications system
(Phase 2+); Technical realization of Short Message Service Cell Broadcast
(SMSCB)".
[4] GSM 04.04 (ETS 300 936): "Digital cellular telecommunications system; layer 1
General requirements".
[5] GSM 04.06 (ETS 300 938): "Digital cellular telecommunications system
(Phase 2+); Mobile Station - Base Station System (MS - BSS) interface; Data
Link (DL) layer specification".
[6] GSM 05.02 (ETS 300 908): "Digital cellular telecommunications system
(Phase 2+); Multiplexing and multiple access on the radio path".
1.2 Abbreviations
Abbreviations used in this ETS are listed in GSM 01.04.
2 General description
SMSCB is a service in which short messages may be broadcast from a PLMN to Mobile Stations (MS)s.
SMSCB messages come from different sources (e.g. traffic reports, weather reports). The source and
subject of the SMSCB message is identified by a message identifier in the SMSCB message header. A
sequence number in the SMSCB message header enables the MS to determine when a new message
from a given source is available.
SMSCB messages are not acknowledged by the MS. Reception of SMSCB messages by the MS is only
possible in idle mode. The geographical area over which each SMSCB message is transmitted is selected
by the PLMN operator, by agreement with the provider of the information.
A SMSCB message is an end-to-end message that is formatted by/for the SMSCB application, and which
is intended for customer viewing. Its format is described in detail in GSM 03.41. A CB message is any
message sent on the basic or extended CBCH (see GSM 05.02). It can be an occurrence of a SMSCB
message, or a schedule message.

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The SMS Cell Broadcast service is designed to minimize the battery usage requirements for a MS. A MS
can read the first part of a CB message and then decide whether or not to read the rest of the message.
In addition, the network may broadcast Schedule Messages, providing information in advance about the
CB messages that will be sent immediately afterwards. The MS may use this scheduling information to
restrict reception to those messages the customer is interested in receiving. This SMSCB DRX feature is
optional in the network and the MS.
2.1 Scheduling Information
The network supporting the SMSCB DRX feature transmits Schedule Messages. A Schedule Message
includes information about a number of immediately following consecutive CB messages, planned for that
cell. The length of time covered by the CB messages referred to in a Schedule Message is called the
Schedule Period of that message. For optimum DRX, a new Schedule Message should follow the last
message of a Schedule Period. When no information is known about a CB message, e.g., because no
Schedule Message has been received referring to that CB message, a MS shall read (at least) the first
part of the CB message. Schedule Messages shall be sent on the basic and extended CBCH
independently.
The network may override the published schedule to transmit new high-priority SMSCB messages.
However, after any schedule deviation, the network shall resume the schedule, by transmitting the
scheduled CB messages at the scheduled times listed in the Schedule Message.
The Schedule Message contains a Message Description for each CB message to be broadcast during the
scheduling period, in order of transmission. The position of a CB message is called the "message slot
number" of the CB message, and it indicates the position of the CB message within the schedule period.
Each Message Description includes various information, including for SMSCB messages directly or
indirectly all or part of their message identifier, and whether an occurrence is a repetition or not.
Each Schedule Message includes a Begin Slot Number field and an End Slot Number field. The End Slot
Number field indicates the length of the schedule period (i.e., specifically the number of CB message slots
about which information is provided). In the case where the network uses Schedule Messages to describe
all message slots in advance, the first Schedule Message of the next schedule period will be transmitted
in the message slot pointed by End Slot Number plus 1. The Begin Slot Number is defined to allow the
network to broadcast several Schedule Messages referring to the same schedule period. The Begin Slot
Number field indicates the message slot number of the CB message following the received Schedule
Message.
The networks may send unscheduled Schedule Messages during empty message slots. The network
need only update the Begin Slot Number in an unscheduled Schedule Message to reflect the current
offset within the Schedule Message of the next message to be transmitted.
3 Message format on BTS-MS Interface
3.1 General
A CB message consists of a 88 octets of information. The 88 octet block is segmented into four 22 octet
blocks. A 1 octet Block type is added as a header to each 22 octet block. The overall blocks are thus
23 octets in length.
The message blocks are sent on the channel allocated as CBCH by GSM 05.02. The timing of the
messages is defined in GSM 05.02. If the network has no cell broadcast information to transmit, then it
may choose to transmit a null message.

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3.2 Format convention
3.2.1 Numbering convention
The basic convention used in this ETS is illustrated in figure 1. The bits are grouped into octets. The bits
of an octet are shown horizontally and are numbered from 1 to 8. Multiple octets are shown vertically and
are numbered from 1 to 23.
87 65 43 21
Octet:
1
2
23
Figure 1/GSM 04.12: Format convention
3.2.2 Order of bit transmission
The message blocks are sent on the CBCH as defined in GSM 05.02 using the coding defined for that
channel.
The order of bit transmission is defined in GSM 04.04.
3.3 Block content
The 23 octet blocks are coded as follows:
87 65 43 21
Octet:
Block type 1
2
Information
23
Figure 2/GSM 04.12: Block content

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3.3.1 Block Type
The purpose of the Block Type is to identify the function of the block and message being sent. The block
type is coded as shown in figure 3/GSM 04.12.
87 65 43 21
Octet:
Spare LPD LB Sequence Number 1
00 1
Figure 3/GSM 04.12: Block type content
Bits 8 is spare and set to zero by the sender. In order to allow compatibility with future modifications to this
protocol, bits 8 shall be ignored by the receiver and messages shall not be rejected because it is set to
one.
The Link Protocol Discriminator (LPD) takes the value "0 1". Other values of LPD indicate other protocols
which are outside the scope of GSM 04.12, and shall cause the message to be ignored when the Cell
Broadcast LPD is expected instead.
NOTE: LPD = "0 0" corresponds to the data link protocol used by LAPDm (see GSM 04.06).
In an SMSCB message the last block containing SMSCB information is signalled by the Last Block (LB)
bit. When the LB bit is set to "0", the next block may contain SMSCB information. When the LB bit is set to
"1", the remaining block(s) do(es) not contain SMSCB information.
Table 1/GSM 04.12: Sequence number coding
Bit No 4 3 2 1
0 0 0 0 First block
0 0 0 1 Second block
0 0 1 0 Third block
0 0 1 1 Fourth block
10 00 :
First schedule block
Message contains SMSCB
scheduling information
1 1 1 1 Null message (does not contain
valid SMSCB information)
All other values of bits 4 to 1 are reserved for future use.
The use of a reserved code point shall cause the message to be ignored.
3.4 SMSCB
...