3GPP TS 23.041 V4.2.0 (2001-12)
`
`Technical Specification
`
`3rd Generation Partnership Project;
`Technical Specification Group Terminals;
`Technical realization of Cell Broadcast Service (CBS)
`(Release 4)
`
`The present document has been developed within the 3rd Generation Partnership Project (3GPP TM) and may be further elaborated for the purposes of 3GPP.
`
`
`
`The present document has not been subject to any approval process by the 3GPP Organizational Partners and shall not be implemented.
`This Specification is provided for future development work within 3GPP only. The Organizational Partners accept no liability for any use of this Specification.
`Specifications and reports for implementation of the 3GPP TM system should be obtained via the 3GPP Organizational Partners' Publications Offices.
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`Keywords
`UMTS, GSM, CBS
`
`
`
`
`
`3GPP
`
`Postal address
`
`
`3GPP support office address
`650 Route des Lucioles - Sophia Antipolis
`Valbonne - FRANCE
`Tel.: +33 4 92 94 42 00 Fax: +33 4 93 65 47 16
`
`Internet
`http://www.3gpp.org
`
`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.
`
`© 2002, 3GPP Organizational Partners (ARIB, CWTS, ETSI, T1, TTA, TTC).
`All rights reserved.
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`Contents
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`3
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`3GPP TS 23.041 V4.2.0 (2001-12)
`
`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 .................................................................................................................................. 8
`4
`CBE Functionality .................................................................................................................................... 9
`5
`CBC Functionality ................................................................................................................................... 9
`6
`BSC/RNC Functionality ......................................................................................................................... 10
`7
`BTS Functionality .................................................................................................................................. 10
`8
`MS/UE Functionality ............................................................................................................................. 10
`9
`Protocols and Protocol Architecture ...................................................................................................... 11
`9.1 Requirements on the Radio Access Network ........................................................................................................ 11
`9.1.1
`GSM Radio Access Network ........................................................................................................................... 11
`9.1.2
`UMTS Radio Access Network ........................................................................................................................ 13
`9.1.3
`UMTS Protocol Overview ............................................................................................................................... 14
`9.2 Requirements on the CBC-interfaces CBC-BSC and CBC-RNC ......................................................................... 14
`9.2.1
`Identification of a CBS message ...................................................................................................................... 15
`9.2.2
`WRITE-REPLACE Request/Indication .......................................................................................................... 15
`9.2.3
`KILL Request/Indication ................................................................................................................................. 17
`9.2.4
`REPORT Response/Confirm ........................................................................................................................... 17
`9.2.5
`STATUS-LOAD-QUERY Request/Indication ................................................................................................ 17
`9.2.6
`STATUS-LOAD-QUERY Response/Confirm ................................................................................................ 17
`9.2.7
`STATUS-MESSAGE-QUERY Request/Indication ........................................................................................ 18
`9.2.8
`STATUS-MESSAGE-QUERY Response/Confirm ........................................................................................ 18
`9.2.9
`REJECT Response/Confirm ............................................................................................................................ 18
`9.2.10
`RESTART-INDICATION Request/Indication ................................................................................................ 19
`9.2.11
`RESET Request/Indication .............................................................................................................................. 19
`9.2.12
`FAILURE-INDICATION Request/Indication ................................................................................................ 19
`9.2.13
`SET-DRX Request/Indication ......................................................................................................................... 20
`9.2.14
`SET-DRX- REPORT Response/Confirm ........................................................................................................ 20
`9.2.15
`CAPACITY-INDICATION Request/Indication ............................................................................................. 20
`9.3
`Parameters ............................................................................................................................................................. 21
`9.3.1
`Message-Identifier ........................................................................................................................................... 21
`9.3.2
`Old-Serial-Number .......................................................................................................................................... 21
`9.3.3
`New-Serial-Number ......................................................................................................................................... 21
`9.3.4
`Number-of-Pages ............................................................................................................................................. 21
`9.3.5
`Cell-List ........................................................................................................................................................... 21
`9.3.5.1 Cell-List sent from CBC to BSC/RNC ............................................................................................................ 22
`9.3.5.2 Cell-List sent from BSC/RNC to CBC ............................................................................................................ 22
`9.3.6
`Channel Indicator ............................................................................................................................................ 22
`9.3.7
`Category ........................................................................................................................................................... 22
`9.3.8
`Repetition-Period ............................................................................................................................................. 22
`9.3.9
`No-of-Broadcasts-Requested ........................................................................................................................... 23
`9.3.10 No-of-Broadcasts-Completed-List ................................................................................................................... 23
`9.3.11
`Cell-Identifier .................................................................................................................................................. 23
`9.3.12
`Schedule-Period ............................................................................................................................................... 24
`9.3.13
`Reserved-Slots ................................................................................................................................................. 24
`9.3.14
`Failure-List ...................................................................................................................................................... 24
`9.3.15
`Radio-Resource-Loading-List ......................................................................................................................... 25
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`Cause ............................................................................................................................................................... 25
`9.3.16
`9.3.17 Diagnostic ........................................................................................................................................................ 26
`9.3.18 Data Coding Scheme ....................................................................................................................................... 26
`9.3.19
`CBS-Message-Information-Page n .................................................................................................................. 26
`9.3.20
`CBS-Message-Information-Length n .............................................................................................................. 26
`9.3.21
`Recovery-Indication ........................................................................................................................................ 26
`9.3.22 Available-Capacity .......................................................................................................................................... 26
`9.4 Message Format on the Radio Network – MS/UE Interface ................................................................................. 27
`9.4.1
`GSM................................................................................................................................................................. 27
`9.4.1.1 General Description ......................................................................................................................................... 27
`9.4.1.2 Message Parameter .......................................................................................................................................... 27
`9.4.1.2.1
`Serial Number ............................................................................................................................................ 27
`9.4.1.2.2
`Message Identifier ...................................................................................................................................... 28
`9.4.1.2.3
`Data Coding Scheme .................................................................................................................................. 30
`9.4.1.2.4
`Page Parameter ........................................................................................................................................... 30
`9.4.1.2.5
`Content of Message .................................................................................................................................... 30
`9.4.2
`UMTS .............................................................................................................................................................. 30
`9.4.2.1 General Description ......................................................................................................................................... 30
`9.4.2.2 Message Parameter .......................................................................................................................................... 30
`9.4.2.2.1
`Message Type ............................................................................................................................................ 30
`9.4.2.2.2
`Message ID ................................................................................................................................................ 31
`9.4.2.2.3
`Serial Number ............................................................................................................................................ 31
`9.4.2.2.4
`Data Coding Scheme .................................................................................................................................. 31
`9.4.2.2.5
`CB Data ...................................................................................................................................................... 31
`9.5 CBS Compression ................................................................................................................................................. 31
`10 CBS Index .............................................................................................................................................. 32
`Protocols for interconnecting CBC and BSC .............................................. 35
`Annex A (informative):
`Change Request History ................................................................................ 36
`Annex B (informative):
`
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`Foreword
`This Technical Specification (TS) has been produced by the 3rd 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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`Scope
`1
`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].
`
`References
`1.1
`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]
`
`[2]
`
`[3]
`
`[4]
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`[5]
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`[6]
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`[7]
`
`[8]
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`[9]
`
`[10]
`
`[11]
`
`[12]
`
`[13]
`
`3GPP TS 01.04: "Digital cellular telecommunication system (Phase 2+); Abbreviations and
`acronyms".
`
`3GPP TS 22.003: "Circuit Teleservices supported by a Public Land Mobile Network (PLMN)".
`
`3GPP TS 23.038: "Alphabets and language-specific information".
`
`3GPP TS 23.040: "Technical realization of the Short Message Service (SMS)".
`
`3GPP TS 03.47: "Digital cellular telecommunication system (Phase 2+); Example protocol stacks
`for interconnecting Service Centre(s) (SC) and Mobile-services Switching Centre(s) (MSC)".
`
`3GPP TS 03.49: "Digital cellular telecommunication system (Phase 2+); Example protocol stacks
`for interconnecting Cell Broadcast Centre (CBC) and Base Station Controler (BSC)".
`
`3GPP TS 04.12: "Digital cellular telecommunication system (Phase 2+); Short Message Service
`Cell Broadcast (SMSCB) support on the mobile radio interface".
`
`3GPP TS 05.02: "Digital cellular telecommunication system (Phase 2+); Multiplexing and
`multiple access on the radio path".
`
`3GPP TS 27.005: "Digital cellular telecommunication system (Phase 2+); Use of Data Terminal
`Equipment - Data Circuit terminating Equipment (DTE - DCE) interface for Short Message
`Service (SMS) and Cell Broadcast Service (CBS)".
`
`3GPP TS 08.52: "Digital cellular telecommunication system (Phase 2+); Base Station
`Controller - Base Transceiver Station (BSC - BTS) interface; Interface principles".
`
`3GPP TS 08.58: "Digital cellular telecommunication system (Phase 2+); Base Station
`Controller - Base Transceiver Station (BSC - BTS) interface; Layer 3 specification".
`
`ITU-T Recommendation X.210: "Information technology - Open systems interconnection - Basic
`Reference Model: Conventions for the definition of OSI services".
`
`3GPP TS 08.08: "Digital cellular telecommunication system (Phase 2+); Mobile-services
`Switching Centre - Base Station System (MSC-BSS) interface; Layer 3 specification".
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`[14]
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`[15]
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`[16]
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`[17]
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`[18]
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`[19]
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`[20]
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`[21]
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`3GPP TS 23.042: "Compression algorithm for text messaging services".
`
`3GPP TS 03.48: "Digital cellular telecommunications system (Phase 2+); Security Mechanisms
`for the SIM application toolkit; Stage 2".
`
`3GPP TS 25.331: "RRC Protocol Specification".
`
`3GPP TS 25.401: "UTRAN Overall Description".
`
`3GPP TS 31.102: "Characteristics of the USIM Application".
`
`3GPP TS 25.324: "Broadcast/Multicast Control BMC".
`
`3GPP TR 21.905: "Vocabulary for 3GPP Specifications".
`
`3GPP TR 25.925: "Radio Interface for Broadcast/Multicast Services".
`
`Abbreviations
`1.2
`For the purposes of the present dcoument, the abbreviations used are listed in 3GPP TS 01.04 [1] and 3GPP TR 21.905
`[20].
`
`General description
`2
`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
`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
`PS-Domain
`Reception of CBS
`Message
`
`CS-Connected
`-
`Not possible
`
`CS-Idle
`PS-Idle
`Possible
`
`CS-Idle
`PS-Connected
`Depends on RRC
`mode
`
`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].
`
`
`
`NOTE:
`
`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 05.02 [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].
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`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.
`
`Network Architecture
`3
`The chosen network architectures differs for GSM and UMTS. In clause 3.1 the GSM network architecture is
`descripted, in clause 3.2 the UMTS network architecture.
`
`GSM Network Architecture
`3.1
`The basic network structure of CBS is depicted by figure 1.
`
`outside scope of GSM Specs.
`
`inside scope of GSM Specs.
`
`MSs
`
`MSs
`
`MSs
`
`4 4
`
`4
`
`BTSs
`
`3 3
`
`3
`
`BSC
`
`2
`
`2 2
`
`CBE
`
`1
`
`CBE
`
`1
`
`CBC
`
`Figure 1
`
`
`
`- message transfer on link 1 is outside the scope of GSM Specifications;
`
`- message transfer on link 2 is described in clause 9.1;
`
`- message transfer on link 3 is described in 3GPP TS 08.58 [11];
`
`- message transfer on link 4 is described in 3GPP TS 04.12 [7] and the timing of messages transferred on link 4 is
`described in 3GPP TS 05.02 [8].
`
`UMTS Network Architecture
`3.2
`The basic network structure of CBS is depicted by figure 2.
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`UE
`
`UE
`
`Uu
`
`UTRAN
`Node B
`
`Node B
`
`Iub
`
`RNC
`
`Cell
`Broadcast
`Center
`
`(CBC)
`
`IuBC
`
`Figure 2
`
`1
`
`
`
`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.
`
`CBE Functionality
`4
`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.
`
`CBC Functionality
`5
`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.
`
`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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`BSC/RNC Functionality
`6
`The BSC/RNC shall interface to only one CBC. A BSC may interface to several BTSs as indicated by GSM 08.52. 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
`appropriate BTS via a sequence of 4 SMS
`BROADCAST REQUEST messages or 1
`SMS BROADCAST COMMAND message
`(see 3GPP TS 08.58 [11]), indicating the
`channel which shall be used.
` optionally generating Schedule Messages,
`indicating the intended schedule of
`transmissions (see GSM 04.12);
`
`The Node B has no functionality regarding CBS.
`This implies that CBS messages do not have to
`be transmitted explicitely to the Node Bs for
`further processing.
`
`Generating Schedule Messages, indicating the
`intended schedule of transmissions (see
`3GPP TS 25.324 [19]). The conversion of GSM
`related CB DRX Information is a function of the
`RNC (3GPP TS 25.401 [17]).
`not applicable
`
` optionally receiving CBCH Load Indication
`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 08.58 [11]);
`
`
`
`To work efficiently on the interfaces, the BSC/RNC should forward CB related messages to the CBC using cell lists as
`far as applicable.
`
`BTS Functionality
`7
`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 08.58 [11]).
`
`MS/UE Functionality
`8
`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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`UE
`Discard corrupt CBS messages received on the
`radio interface
`
`MS
` discard sequences transferred via the radio
`path (see 3GPP TS 04.12 [7]) which do not
`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 broadcasts of CBS messages already received (message has not
`changed since it was last broadcast i.e. sequence number has not changed within the message's
`indicated geographical area);
`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)
`3GPP TS 04.12 [7]);
` optionally skip reception of the remaining
`block(s) of a CBS message which do(es) not
`contain cell broadcast information (see
`3GPP TS 04.12 [7]);
`Not applicable for UMTS.
`Optionally read the extended channel
`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
`
`not applicable
`
`Protocols and Protocol Architecture
`
`
`
` 9
`
`9.1
`
`Requirements on the 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 04.12 [7]).
`
`With the SMS BROADCAST REQUEST mode of operation, the 88 octet fixed length CBS page which is specified in
`clause 9.3 is split into four 22 octet blocks which are carried in SMS BROADCAST REQUEST messages as follows:
`
`octets 1-22 are transferred in the 1st SMS BROADCAST REQUEST
`
`with a sequence number (see 3GPP TS 04.12 [7]) indicating first block;
`
`octets 23-44 are transferred in the 2nd SMS BROADCAST REQUEST
`
`with a sequence number (see 3GPP TS 04.12 [7]) indicating second block;
`
`octets 45-66 are transferred in the 3rd SMS BROADCAST REQUEST
`
`with a sequence number (see 3GPP TS 04.12 [7]) indicating third block;
`
`octets 67-88 are transferred in the 4th SMS BROADCAST REQUEST
`
`with a sequence number (see 3GPP TS 04.12 [7]) indicating fourth block.
`
`Figure 3 illustrates the protocol architecture and the scope of the various GSM Specifications for the SMS
`BROADCAST REQUEST mode of operation.
`
`3GPP
`
`11/36
`
`DOJ EX. 1019
`
`

`
`
`Release 4
`
`12
`
`3GPP TS 23.041 V4.2.0 (2001-12)
`
` 3G TS 23.041
`Section 9.2
`
`3G TS 23.041 Section 9.4
`
`GSM 08.58
`
`GSM 04.12
`
`CBC
`
`BSC
`
`BTS
`
`MSs
`
`Write-Replace
`
`Report-Success
`
`SMS BROADCAST REQUEST 1
`
`SMS BROADCAST REQUEST 2
`
`SMS BROADCAST REQUEST 3
`
`SMS BROADCAST REQUEST 4
`
`1
`
`2
`
`3
`
`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 nu