European digital cellular telecommunications system (Phase 2); Signalling transport mechanism specification for the Base Station System - Mobile-services Switching Centre (BSS - MSC) interface (GSM 08.06)

....

Evropski digitalni celični telekomunikacijski sistem (faza 2) – Specifikacija signalnega transportnega mehanizma za vmesnik za sistem baznih postaj - komutacija mobilnih storitev (BSS-MSC) (GSM 08.06)

General Information

Status
Published
Publication Date
30-Nov-2003
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
01-Dec-2003
Due Date
01-Dec-2003
Completion Date
01-Dec-2003

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SLOVENSKI STANDARD
SIST ETS 300 589 E1:2003
01-december-2003
(YURSVNLGLJLWDOQLFHOLþQLWHOHNRPXQLNDFLMVNLVLVWHP ID]D ±6SHFLILNDFLMD
VLJQDOQHJDWUDQVSRUWQHJDPHKDQL]PD]DYPHVQLN]DVLVWHPED]QLKSRVWDM
NRPXWDFLMDPRELOQLKVWRULWHY %6606&  *60

European digital cellular telecommunications system (Phase 2); Signalling transport

mechanism specification for the Base Station System - Mobile-services Switching Centre

(BSS - MSC) interface (GSM 08.06)
Ta slovenski standard je istoveten z: ETS 300 589 Edition 1
ICS:
33.070.50 Globalni sistem za mobilno Global System for Mobile
telekomunikacijo (GSM) Communication (GSM)
SIST ETS 300 589 E1:2003 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST ETS 300 589 E1:2003
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SIST ETS 300 589 E1:2003
EUROPEAN ETS 300 589
TELECOMMUNICATION September 1994
STANDARD
Source:ETSI TC-SMG Reference:GSM 08.06
ICS: 33.060.30

European digital cellular telecommunications system, Global System for Mobile communications

Key words:
(GSM)
European digital cellular telecommunications system (Phase 2);
Signalling transport mechanism specification for the Base
Station
System - Mobile-services Switching Centre (BSS - MSC) interface
(GSM 08.06)
ETSI
European Telecommunications Standards Institute
ETSI Secretariat
F-06921 Sophia Antipolis CEDEX - FRANCE
Postal address:
650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCE
Office address:
c=fr, a=atlas, p=etsi, s=secretariat - secretariat@etsi.fr
X.400: Internet:
Tel.: +33 92 94 42 00 - Fax: +33 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 1994. All rights reserved.
New presentation - see History box
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ETS 300 589: September 1994

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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ETS 300 589: September 1994
Contents

Foreword...........................................................................................................................................5

0 General...........................................................................................................................................7

0.1 Scope................................................................................................................................. 7

0.2 Normative references...........................................................................................................7

0.3 Definitions and abbreviations .............................................................................................. 12

1 Field of application ......................................................................................................................... 12

2 Functional content.......................................................................................................................... 12

3 Message transfer part (MTP) functions............................................................................................ 13

3.1 General ............................................................................................................................ 13

3.2 Level 1 (CCITT Recommendation Q.702)............................................................................ 13

3.3 Level 2 (CCITT Recommendation Q.703)............................................................................ 14

3.4 Level 3 (CCITT Recommendation Q.704)............................................................................ 15

3.5 Testing and Maintenance (CCITT Recommendation Q.707).................................................. 20

4 Interface functions.......................................................................................................................... 20

5 SCCP functions.............................................................................................................................. 21

5.1 Overview .......................................................................................................................... 21

5.2 Primitives (CCITT Recommendation Q.711)......................................................................... 22

5.3 SCCP messages (CCITT Recommendation Q.712).............................................................. 23

5.4 SCCP formats and codes (CCITT Recommendation Q.713) ................................................. 24

5.5 SCCP procedures (Q.714) ................................................................................................. 26

6 Use of the SCCP ........................................................................................................................... 28

6.1 Connection establishment................................................................................................... 29

6.1.1 Establishment procedure in case (i).................................................................... 30

6.1.2 Establishment procedure in case (ii)................................................................... 30

6.2 Connection release ............................................................................................................ 31

6.3 Transfer of DTAP and BSSMAP data.................................................................................. 31

6.3.1 Distribution function........................................................................................... 31

6.3.2 Transfer of DTAP messages ............................................................................. 32

6.3.3 Transfer of BSSMAP messages ........................................................................ 33

6.4 Connectionless services ..................................................................................................... 34

7 Use of the SCCP for operations and maintenance ............................................................................ 35

7.1 Connectionless service....................................................................................................... 35

7.2 Connection oriented services.............................................................................................. 35

7.3 BSS failure........................................................................................................................ 35

History............................................................................................................................................. 36

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ETS 300 589: September 1994
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 defines the signalling transport mechanism specification for the Base Station System (BSS) to

Mobile-services Switching Centre (MSC) interface. This ETS corresponds to GSM technical specification

GSM 08.06 version 4.4.1.

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/PNE rules.

Reference is made within this ETS to GSM-TSs (NOTE).

NOTE: TC-SMG has produced documents which give the technical specifications for the

implementation of the European digital cellular telecommunications system. Historically,

these documents have been identified as GSM Technical Specifications (GSM-TSs).
These TSs may have subsequently become I-ETSs (Phase 1), or ETSs (Phase 2),

whilst others may become ETSI Technical Reports (ETRs). GSM-TSs are, for editorial

reasons, still referred to in GSM ETSs.
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0 General
0.1 Scope

This Technical Specification is divided split into two parts, Chapters 1-4 dealing with the MTP and chapters

5-7 dealing with the SCCP and its use.

The MTP provides a mechanism giving reliable transfer of signalling messages. Chapters 1-4 of this

Technical Specification deals with the subset of the MTP that can be used between an BSS and an MSC,

which iscompatible with a full MTP.

The SCCP is used to provide a referencing mechanism to identify a particular transaction relating to for

instance a particular call. Chapters 5-7 identify the SCCP subset that should be used betweenan BSS and

an MSC. The SCCP can also be used to enhance the message routing for (for instance) operations and

maintenance information.
0.2 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 100): "European digital cellular telecommunications system
(Phase 2); Abbreviations and acronyms".
[2] GSM 02.01 (prETS 300 500): "European digital cellular telecommunications
system (Phase 2); Principles of telecommunication services supported by a
GSM Public Land Mobile Network (PLMN)".
[3] GSM 02.02 (prETS 300 501): "European digital cellular telecommunications
system (Phase 2); Bearer Services (BS) supported by a GSM Public Land
Mobile Network (PLMN)".
[4] GSM 02.03 (prETS 300 502): "European digital cellular telecommunications
system (Phase 2); Teleservices supported by a GSM Public Land Mobile
Network (PLMN)".
[5] GSM 02.04 (prETS 300 503): "European digital cellular telecommunications
system (Phase 2); General on supplementary services".
[6] GSM 02.06 (prETS 300 504): "European digital cellular telecommunications
system (Phase 2); Types of Mobile Stations (MS)".
[7] GSM 02.07 (prETS 300 505): "European digital cellular telecommunications
system (Phase 2); Mobile Station (MS) features".
[8] GSM 02.08 (ETR 101): "European digital cellular telecommunications system
(Phase 2); Quality of service".
[9] GSM 02.09 (prETS 300 506): "European digital cellular telecommunications
system (Phase 2); Security aspects".
[10] GSM 02.11 (prETS 300 507): "European digital cellular telecommunications
system (Phase 2); Service accessibility".
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[11] GSM 02.16 (prETS 300 508): "European digital cellular telecommunications
system (Phase 2); International Mobile station Equipment Identities (IMEI)".
[12] GSM 02.17 (prETS 300 509): "European digital cellular telecommunications
system (Phase 2); Subscriber identity modules Functional characteristics".
[13] GSM 02.24 (prETS 300 510): "European digital cellular telecommunications
system (Phase 2); Description of Charge Advice Information (CAI)".
[14] GSM 02.30 (prETS 300 511): "European digital cellular telecommunications
system (Phase 2); Man-Machine Interface (MMI) of the Mobile Station (MS)".
[15] GSM 02.40 (prETS 300 512): "European digital cellular telecommunications
system (Phase 2); Procedures for call progress indications".
[16] GSM 02.41 (prETS 300 513): "European digital cellular telecommunications
system (Phase 2); Operator determined barring".
[17] GSM 02.81 (prETS 300 514): "European digital cellular telecommunications
system (Phase 2); Line identification supplementary services - Stage 1".
[18] GSM 02.82 (prETS 300 515): "European digital cellular telecommunications
system (Phase 2); Call Forwarding (CF) supplementary services - Stage 1".
[19] GSM 02.83 (prETS 300 516): "European digital cellular telecommunications
system (Phase 2); Call Waiting (CW) and Call Hold (HOLD) supplementary
services - Stage 1".
[20] GSM 02.84 (prETS 300 517): "European digital cellular telecommunications
system (Phase 2); MultiParty (MPTY) supplementary services - Stage 1".
[21] GSM 02.85 (prETS 300 518): "European digital cellular telecommunications
system (Phase 2); Closed User Group (CUG) supplementary services -
Stage 1".
[22] GSM 02.86 (prETS 300 519): "European digital cellular telecommunications
system (Phase 2); Advice of charge (AoC) supplementary services - Stage 1".
[23] GSM 02.88 (prETS 300 520): "European digital cellular telecommunications
system (Phase 2); Call Barring (CB) supplementary services - Stage 1".
[24] GSM 04.01 (prETS 300 550): "European digital cellular telecommunications
system (Phase 2); Mobile Station - Base Station System (MS - BSS) interface
General aspects and principles".
[25] GSM 04.02 (prETS 300 551): "European digital cellular telecommunications
system (Phase 2); GSM Public Land Mobile Network (PLMN) access reference
configuration".
[26] GSM 04.03 (prETS 300 552): "European digital cellular telecommunications
system (Phase 2); Mobile Station - Base Station System (MS - BSS) interface
Channel structures and access capabilities".
[27] GSM 04.04 (prETS 300 553): "European digital cellular telecommunications
system (Phase 2); layer 1 General requirements".
[28] GSM 04.05 (prETS 300 554): "European digital cellular telecommunications
system (Phase 2); Data Link (DL) layer General aspects".
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[29] GSM 04.06 (prETS 300 555): "European digital cellular telecommunications
system (Phase 2); Mobile Station - Base Station System (MS - BSS) interface
Data Link (DL) layer specification".
[30] GSM 04.07 (prETS 300 556): "European digital cellular telecommunications
system (Phase 2); Mobile radio interface signalling layer 3 General aspects".
[31] GSM 04.08 (prETS 300 557): "European digital cellular telecommunications
system (Phase 2); Mobile radio interface layer 3 specification".
[32] GSM 04.10 (prETS 300 558): "European digital cellular telecommunications
system (Phase 2); Mobile radio interface layer 3 Supplementary services
specification General aspects".
[33] GSM 04.11 (prETS 300 559): "European digital cellular telecommunications
system (Phase 2); Point-to-Point (PP) Short Message Service (SMS) support on
mobile radio interface".
[34] GSM 04.12 (prETS 300 560): "European digital cellular telecommunications
system (Phase 2); Short Message Service Cell Broadcast (SMSCB) support on
the mobile radio interface".
[35] GSM 04.13 (prETS 300 561): "European digital cellular telecommunications
system (Phase 2); Performance requirements on mobile radio interface".
[36] GSM 04.21 (prETS 300 562): "European digital cellular telecommunications
system (Phase 2); Rate adaption on the Mobile Station - Base Station System
(MS - BSS) interface".
[37] GSM 04.22 (prETS 300 563): "European digital cellular telecommunications
system (Phase 2); Radio Link Protocol (RLP) for data and telematic services on
the Mobile Station - Base Station System (MS - BSS) interface and the Base
Station System - Mobile-services Switching Centre (BSS - MSC) interface".
[38] GSM 04.80 (prETS 300 564): "European digital cellular telecommunications
system (Phase 2); Mobile radio interface layer 3 supplementary services
specification Formats and coding".
[39] GSM 04.81 (prETS 300 565): "European digital cellular telecommunications
system (Phase 2); Line identification supplementary services - Stage 3".
[40] GSM 04.82 (prETS 300 566): "European digital cellular telecommunications
system (Phase 2); Call Forwarding (CF) supplementary services - Stage 3".
[41] GSM 04.83 (prETS 300 567): "European digital cellular telecommunications
system (Phase 2); Call Waiting (CW) and Call Hold (HOLD) supplementary
services - Stage 3".
[42] GSM 04.84 (prETS 300 568): "European digital cellular telecommunications
system (Phase 2); MultiParty (MPTY) supplementary services - Stage 3".
[43] GSM 04.85 (prETS 300 569): "European digital cellular telecommunications
system (Phase 2); Closed User Group (CUG) supplementary services -
Stage 3".
[44] GSM 04.86 (prETS 300 570): "European digital cellular telecommunications
system (Phase 2); Advice of Charge (AoC) supplementary services - Stage 3".
[45] GSM 04.88 (prETS 300 571): "European digital cellular telecommunications
system (Phase 2); Call Barring (CB) supplementary services - Stage 3".
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[46] GSM 04.90 (prETS 300 572): "European digital cellular telecommunications
system (Phase 2); Unstructured supplementary services operation - Stage 3".
[47] GSM 08.08 (prETS 300 590): "European digital cellular telecommunications
system (Phase 2); Mobile Switching Centre - Base Station System (MSC - BSS)
interface Layer 3 specification".
[48] GSM 12.00 (prETS 300 612-1): "European digital cellular telecommunications
system (Phase 2); Objectives and structure of Network Management (NM)".
[49] GSM 12.01 (prETS 300 612-2): "European digital cellular telecommunications
system (Phase 2); Common aspects of GSM Network Management (NM)".
[50] GSM 12.07 (prETS 300 612-3): "European digital cellular telecommunications
system (Phase 2); Operations and performance management".
[51] GSM 12.02 (prETS 300 613): "European digital cellular telecommunications
system (Phase 2); Subscriber, Mobile Equipment (ME) and services data
administration".
[52] GSM 12.03 (prETS 300 614): "European digital cellular telecommunications
system (Phase 2); Security management".
[53] GSM 12.04 (prETS 300 615): "European digital cellular telecommunications
system (Phase 2); Performance data measurements".
[54] GSM 12.05 (prETS 300 616): "European digital cellular telecommunications
system (Phase 2); Subscriber related event and call data".
[55] GSM 12.06 (prETS 300 617): "European digital cellular telecommunications
system (Phase 2); GSM Network change control".
[56] GSM 12.10 (prETS 300 618): "European digital cellular telecommunications
system (Phase 2); Maintenance provisions for operational integrity of Mobile
Stations (MS)".
[57] GSM 12.11 (prETS 300 619): "European digital cellular telecommunications
system (Phase 2); Maintenance of the Base Station System (BSS)".
[58] GSM 12.13 (prETS 300 620): "European digital cellular telecommunications
system (Phase 2); Maintenance of the Mobile-services Switching Centre (MSC)".
[59] GSM 12.14 (prETS 300 621): "European digital cellular telecommunications
system (Phase 2); Maintenance of location registers".
[60] GSM 12.20 (prETS 300 622): "European digital cellular telecommunications
system (Phase 2); Network Management (NM) procedures and messages".
[61] GSM 12.21 (prETS 300 623): "European digital cellular telecommunications
system (Phase 2); Network Management (NM) procedures and message on the
A-bis interface".
[62] GSM 12.22 (prETS 300 624): "European digital cellular telecommunications
system (Phase 2); Interworking of GSM Network Management (NM) procedures
and messages at the Base Station Controller (BSC)".
[63] CCITT Recommendation Q.702: "Specifications of Signalling System No. 7 -
Signalling data link".
[64] CCITT Recommendation Q.703: "Signalling link".
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[65] CCITT Recommendation Q.704: "Signalling network functions and messages".
[66] CCITT Recommendation Q.707: "Specifications of Signalling System No. 7 -
Testing and maintenance".
[67] CCITT Recommendation Q.711: "Functional description of the signalling
connection control part".
[68] CCITT Recommendation Q.712: "Definition and function of SCCP messages".
[69] CCITT Recommendation Q.713: "SCCP formats and codes".

[70] CCITT Recommendation Q.714: "Signalling connection control part procedures".

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0.3 Definitions and abbreviations
Abbreviations used in this specification are listed in GSM 01.04
1 Field of application

1.1 This Technical Specification is applicable to the signalling between radio subsystems (BSS) and

mobile switching centres (MSCs) in GSM PLMNs. It provides a minimum set of MTP requirements

that may be implemented at a BSS or MSC, whilst maintaining compatibility with the implementation

of a full specification of the MTP.

1.2 The Technical Specification defines the interface at the 64 k/bit boundary to the BSS or MSC and

applies primarily for digital access arrangements, the use of analogue arrangements is a national

concern.

1.3 The security of signalling links is a national concern, however it is recommended that in the case

where more than one multiplex system is required and security reasons dictate the use of a multiple

link linkset, then each signalling link should be assigned in a different multiplex system. It is however

noted that this is of little benefit if diversity of routing of the multiplexes is not used.

1.4 For initial implementations only the associated mode of signalling may be applicable at the BSS.

Future evolution or economic reasons applicable to the interface may however make the use of STP

working at the BSS attractive, in which case some of the simplifications in this paper will not apply.

1.5 A variety of information types may be supported by the signalling system, e.g. relating to circuit

switched call control and packet communication. These are fully defined in the service series of

Technical Specifications (the GSM 02.xx series).

1.6 The CCITT recommendations concerning the MTP shall be taken as being requirements unless

covered by a statement in this Technical Specification.
2 Functional content
The functional requirements are as follows:

2.1 The network call control functions are as specified in Technical Specifications GSM 08.08, 04.08.

2.2 The minimum set of Message Transfer Part functions are specified in Blue Book CCITT

Recommendations Q.702, Q.703, Q.704 and Q.707, with the qualifications specified in this

Technical Specification.

2.3 The additional interface functions required for the proper operation of the layer 3 control functions in

combination with the Message Transfer Part functions, is specified in clause 4 of this Technical

Specification.
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3 Message transfer part (MTP) functions
3.1 General

The MTP functions as specified in CCITT Recommendations Q.702, Q.703, Q.704 and Q.707 are

applicable. However, the following exceptions and modifications to those Recommendations may be

applied for the MSC to BSS signalling, see subclauses 3.2 to 3.4.

Some form of policing could be included at the MSC in order to ensure that no signalling messages

received from the BSS can be routed further than the MSC if an administration requires. This is necessary

to prevent fraudulent use of the signalling network for implementations of the GSM system. The manner in

which this is achieved will be dependent on national circumstances and system implementations.

Where load sharing is used, all messages to do with a given SCCP connection should be passed down a

given link.
3.2 Level 1 (CCITT Recommendation Q.702)
Q.702 fig 2

These figures should be treated as for information only. For the standard application of GSM, interface

point C is appropriate.
Q.702 subclause 1.4

The use of analogue circuits to support the signalling link is a national matter.

Q.702 clause 2

A signalling rate of 64kbits/s is assumed. Lower rates (e.g. using analogue bearers) are a national

concern.
Q.702 clause 3

Error characteristics and availability are a national concern. Care should be taken as excessive errors

could lead to inefficient use of the signalling links.
Q.702 clause 5

The standard arrangement will be to derive the signalling link from a 2048 kbits/s digital path.

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Q.702 clause 6
Only digital signalling data links are relevant.

The use of analogue bearers to support this interface is considered a national concern. However it should

be noted that there will be potential problems with the following areas:

- The signalling load may exceed that which can be carried by a single low rate analogue link, this

may lead to an excessive number of signalling links and more complex
changeover/changebackprocedures.

- The performance of the analogue lines used to carry the signalling link will have a major impact on

the throughput of signalling information that can be achieved.
- Message delay may degrade the quality of service.
3.3 Level 2 (CCITT Recommendation Q.703)
Q.703 subclause 1.4
Only the basic error correction protocol is required.
Q.703 subclause 1.7

Only the emergency proving period and status indications should be used by the BSS.

Q.703 clause 6
Not applicable, only basic error correction is required.
Q.703 clause 7

In the initial alignment procedure specified in CCITT Recommendation Q.703, only the emergency proving

is applicable for the BSS. Thus, in states 02 and 03 of the initial alignment procedure statusindication "N" is

not sent from the BSS. The BSS should be capable of recognising status indication "N" if received in order

for the alignment procedure to complete.
Q.703 clause 8

The processor outage status indicator shall be recognised at the BSS and the procedures defined in

CCITT Recommendation Q.703 clause 8 supported.

The BSS shall support the generation of the processor outage indication towards the MSC if this is

appropriate.
Q.703 clause 10
Only the emergency alignment procedures are required.
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3.4 Level 3 (CCITT Recommendation Q.704)
Q.704 subclause 1.1.2.

If the BSS is only implemented as the end point of a signalling link, ie it does not support STP working,

then there will be no signalling transfer point network management features which need to be considered.

Q.704 subclause 1.3

Signalling link management is required. Load sharing is required, and changeover/back between links within

a single linkset are required.
Q.704 clause 2

Since STP working is not required the discrimination and routing functions of the MTP used for GSM

application can be significantly simplified.

NOTE: Since the implementation of this interface is intended only for point to point application

the routing function within the MTP will be preset to select the point code appropriate to

the parent MSC.
Q.704 subclause 2.2 Routing label

Load sharing will be performed on BSS s with more than one signalling link by means of the signalling link

selection field (SLS).
Q.704 subclause 2.3 Message routing function

Load sharing between linksets is not required since there will only be one linkset between BSS and MSC.

Q.704 subclause 2.3.5.

Either of the two methods of congestion control is acceptable. The most appropriate method is dependent

on national CCITT No. 7 implementations.
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Q.704 subclause 2.4 Message discrimination

At the BSS only messages with a correctly checking DPC will be accepted. Others will be discarded. It is

recommended that discarding a message because of an incorrectly set point code causes an incident

report to be generated.

At an MSC (which has the capability of acting as an STP) an administration may decide that each

message received from a BSS signalling link is passed through a "screening function" that checks thatthe

DPC of the message is the same as the SP code of the exchange. If that is the case, the message is sent

to the normal MTP message handling functions. Otherwise, the message is discarded and anincident

report is made.

The signalling point code for an BSS may be included in the national signalling point code scheme or in a

separate signalling network. In the case where the signalling point code is in the nationalnetwork the MSC

need have only one point code, in the case where the signalling point code is in a separate "PLMN"

signalling network, the MSC will be required to have two signalling point codes, onefor each network.

Q.704 subclause 3.1.3 c)
There is no requirement for signalling route management.
Q.704 subclause 3.3.1.3
There is no requirement for signalling route management.
Q.704 subclause 3.3.2.3
There is no requirement for signalling route management.
Q.704 subclause 3.3.3.3
There is no requirement for signalling route management.
Q.704 subclause 3.3.4.3
There is no requirement for signalling route management.
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Q.704 subclause 3.3.5.2

There is no requirement for signalling route management or signalling link blocking initiated by a

management system.
Q.704 subclause 3.3.6.2
There is no requirement for signalling route
...

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