1、STD-ETSI TS LO1 252-ENGL 1999 = 3400855 0442635 hT7 ETSI TS 1 O1 252 V7.0.0 (1999-08) Technical Specification Digital cellular telecommunications system (Phase 2+); Description for the use of a Shared Inter Working Function (SIWF) in a GSM PLMN; Stage 2 (GSM 03.54 version 7.0.0 Release 1998) (GSM 03
2、.54 version 7.0.0 Release 1998) 2 ETSI TS 1 O1 252 V7.0.0 (1 999-08) Reference RTS/SMG-O40354Q7 (blc03i03.PDF) Keywords Digital cellular telecommunications system, Global System for Mobile communications (GSM) ETSI Postal address F-O6921 Sophia Antipolis Cedex - FRANCE Office address 650 Route des L
3、ucioles - Sophia Antipolis Valbonne - FRANCE Siret No 348 623 562 00017 - NAF 742 C Association a but non lucratif enregistre la Sous-prfecture de Grasse (06) No 7803/88 Tel.: +33 4 92 94 42 O0 Fax: +33 4 93 65 47 16 Internet secretariat Q etsi.fr Individual copies of this ETSI deliverable can be do
4、wnloaded from http:/www.etsi.org If you find errors in the present document, send your comment to: editorQetsi.fr 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. O European T
5、elecommunications Standards Institute 1999. All rights reserved. STDmETSI TS LOI 252-ENGL 1999 E 3400855 0442b3b 533 _ - (GSM 03.54 version 7.0.0 Release 1998) ETSI TS 1 O1 252 V7.0.0 (1 999-08) Contents Intellectual Property Rights . 5 Foreword 5 1 2 3 3.1 3.2 4 4.1 4.2 4.3 4.4 4.4.1 4.4.2 4.4.3 4.
6、5 4.6 5 5.1 5.2 5.2.1 5.2.2 5.3 5.3.1 5.3.2 5.4 5.4.1 5.4.2 5.4.3 5.5 5.5.1 5.5.2 5.5.3 5.6 5.7 5.8 5.9 6 6.1 6.2 6.3 6.4 6.5 6.6 6.7 6.8 6.9 Scope 6 References 6 Definitions and Abbreviations . 7 Definitions . 7 Abbreviations . 7 Architecture . 8 General . 8 Routeing principles 8 Visited MSC with a
7、dditional SIWF functionality (SIWFC) 10 SIWFS - Shared Inter Working Function Server . 10 General . 10 IWU 11 Data call Routeing Mechanism (DRM) 11 K Interface and Signalling . 11 Fixed Network . 11 Procedures 12 General . 12 Mobile Originated calls . 12 Call flow MOC (Loop Method) . 14 Call flow fo
8、r MOC (Non Loop Method) 15 Mobile Terminated calls 15 Call flow for MTC (Loop Method) 17 Call Flow for MTC (Non-Loop Method) . 17 In Call Modification (ICM) . 17 Call in Data/Fax Mode . 18 Call in Speech Mode 18 Call Flow for ICM Procedure . 20 Modifications in a connection 20 Channel Mode Modify (C
9、MM) 20 User initiated resource up- and down grading 21 Network Resource up- and downgrading . 21 Release . 22 Negotiation of parameters 22 Inter MSC handover . 22 Reset 22 SIWF and Supplementary Services . 22 Call Offering Supplementary Services . 23 User-to-User Supplementary Services . 23 Support
10、of Private Numbering Plan (SPNP) 23 Number Identification Supplementary Services . 23 Call Waiting (CW) . 23 Closed User Group (CUG) 23 Charging Supplementary Services . 23 Call Restrictions . 23 Call Completion on Busy Subscriber (CCBS) . 23 STDmETSI TS 101 252-ENGL L979 m 3400855 0442b37 47T (GSM
11、03.54 version 7.0.0 Release 1998) 4 ETSI TS 1 O1 252 V7.0.0 (1 999-08) 7 Interaction with CAMEL . 23 8 Operation and Maintenance Aspects . 24 9 Charging . 24 1 O Interception . . . . . . . . . ._. . . . . . . . . . . . ,. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12、. . . . . . 24 Annex A (informative): Change Request History . 25 History 26 (GSM 03.54 version 7.0.0 Release 1998) 5 ETSI TS 1 O1 252 V7.0.0 (1 999-08) Intellectual Property Rights IPRs essential or potentially essential to the present document may have been declared to ETSI. The information pertai
13、ning to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found in SR O00 3 14: “intellectual Proper9 Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in respect ofETSI standards“, which is available free of charge from the ETSI
14、 Secretariat. Latest updates are available on the ETSI Web server (http:/www.etsi.org/ipr). 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 SR O00 314 (or the update
15、s 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 the Special Mobile Group (SMG). The present document defines the stage 2 for the introduction of a Shared Inter Working Function in a GSM
16、Public Land Mobile Network. The contents of the present document is subject to continuing work within SMG and may change following formal SMG approval. Should SMG modi the contents of the present document, it will be re-released with an identifying change of release date and an increase in version n
17、umber as follows: Version 7.x.y where: 7 indicates Release 1998 of GSM Phase 2+ x the second digit is incremented for all changes of substance, i.e. technical enhancements, corrections, updates, etc. y the third digit is incremented when editorial only changes have been incorporated in the specifica
18、tion. (GSM 03.54 version 7.0.0 Release 1998) 6 ETSI TS 1 O1 252 V7.0.0 (1 999-08) 1 Scope The present document defines the stage two description of the Shared Inter Working Function (SIWF) on Global System for Mobile communications (GSM). A stage one description does not exist because this service i
19、s not visible to the service subscribers and users. This stage two identifies the functional Capabilities and information flows needed to support the service. The signalling system protocols and switching functions needed to implement this service are defined in the relevant specifications. Interwor
20、king with other networks (e.g. PSTN) needs the presence of specific functions associated with the MSC, known as interworking functions (IWF). The IWFs depend on the type of network with which it is desired to interconnect and the type of service desired. A Shared Inter Working Function is a network
21、function that may be used by any MSC in the same PLMN to provide interworking for a datdfax call. Whereas an IWF can only be used by its MSC, the SIWF can be used by several other network nodes e.g. any MSC within the same PLMN (the concept is not limited to a certain number of MSCs). SIWF is applie
22、d to data services in GSM Phase 2 and GSM Phase 2+ (as defined in GSM 02.02, GSM 02.03 and GSM 02.34). The usage of a SIWF requires no additional manipulation at the MS. There is an interest to have a Shared Interworking Function (SIWF) for the following reasons: - possibility to fabricate/obtain th
23、e specific functionality needed for data services in areas where data traffic is expected to be low, handling of data calls in case of local overload of the data traffic, quick introduction and roll-out of new data services. - - 2 Ref e rences The following documents contain provisions which, throug
24、h 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. 0 For a specific reference, subsequent revisions do not apply. For a non-specific reference, the latest v
25、ersion applies. 0 A non-specific reference to an ETS shall also be taken to refer to later versions published as an EN with the same number. For this Release 1998 document, references to GSM documents are for Release 1998 versions (version 7.x.y). il GSM 01.04: “Digital cellular telecommunications s
26、ystem (Phase 2+); Abbreviations and acronyms“. GSM 02.02: “Digital cellular telecommunications system (Phase 2+); Bearer Services (BS) supported by a GSM Public Land Mobile Network (PLMN)“. GSM 02.03: “Digital cellular telecommunications system (Phase 2+); Teleservices supported by a GSM Public Land
27、 Mobile Network (PLMN)“. GSM 02.04: “Digital cellular telecommunications system (Phase 2+); General on supplementary Services“. i21 31 141 151 GSM 02.33: “Digital cellular telecommunication system (Phase 2+); Lawful interception - Stage 1“. (GSM 03.54 version 7.0.0 Release 1998) 7 ETSI TS 101 252 V7
28、.0.0 (1999-08) 61 GSM 02.34: “Digital cellular telecommunication system (Phase 2+); High Speed Circuit Switched Data (HSCSD) - Stage 1“. I81 GSM 03.34: “Digital cellular telecommunication system (Phase 2+); High Speed Circuit Switched Data (HSCSD); Stage 2 Service Description“. GSM 03.45: “Digital c
29、ellular telecommunications system (Phase 2+); Technical realization of facsimile group 3 transparent“. GSM 07.01 : “Digital cellular telecommunications system (Phase 2+); General on Terminal Adaptation Functions (TAF) for Mobile Stations (MS)“. GSM 09.05: “Digital cellular telecommunications system
30、(Phase 2+); Interworking between the Public Land Mobile Network (PLMN) and the Packet Switched Public Data Network (PSPDN) for Packet AssemblyDisassembly facility access (PAD)“. GSM 09.06: “Digital cellular telecommunications system (Phase 2+); Interworking between a Public Land Mobile Network (PLMN
31、) and a Packet Switched Public Data Networknntegrated Services Digital Network (PSPDNflSDN) for the support of packet switched data transmission services“. i91 lo1 11 11 I21 GSM 09.07: “Digital cellular telecommunications system (Phase 2+); General requirements on interworking between the Public Lan
32、d Mobile Network (PLMN) and the Integrated Services Digital Network (ISDN) or Public Switched Telephone Network (PSTN)“. ETS 300 102-1 : “Integrated Services Digital Network (ISDN); User-network interface layer 3 Specifications for basic call control“. 3 3.1 Definitions and Abbreviations Definitions
33、 For the purposes of the present document, the following definitions apply: Visited MSC: The MSC which is responsible for handling calls involving the mobile. In the description of inter-MSC handover in GSM 03.09 this is the MSC referred to as “MSC-A (controlling MSC). K Interface: The interface bet
34、ween the visited MSC and an SIWFS. 3.2 Abbreviations For the purposes of the present document, the the following abbreviations apply: CD CDo CDm DRM IWF IWU MSCNWFS SIWF SIWFC SIWFS Call Direction. Call Direction at Call Set-up. Call Direction modify. Data call Routeing Mechanism Inter Working Funct
35、ion Inter Working Unit. An MSC with an implemented SIWF Server. Shared Interworking Function. Shared Inter Working Function Controller. Additional functionality in the visited MSC for the support of SIWFS. SIWF Server. SIWFS is the entity where the used IWU is located. Other abbreviations used in th
36、e present document are listed in GSM 01.04. (GSM 03.54 version 7.0.0 Release 1998) 8 ETSI TS 101 252 V7.0.0 (1999-08) 4 Architecture 4.1 General An IWF provides specific functions associated with the visited MSC for the interworking with other networks. It comprises signalling and traffic channel re
37、lated functions. The traffic channel related functions are provided by an Inter Working Unit (IWU). The SIWF concept is that it provides specific functions for the interworking with other networks. It comprises signalling and traffic channel related functions. Whereas the signalling related function
38、s are associated with the visited MSC, the IWU providing the traffic channel related functions has another physical location. The entity that contains all additional functions needed in the visited MSC to provide the SIWF is called SIWF Controller (SIWFC). The entity where the IWU is located is call
39、ed SIWF Server (SIWFS). The Interface between a visited MSC and a SIWFS is called the K Interface. SIWFS can be provided by a MSC (MSC/SIWFS) or by another network entity (stand alone SIWFS). Figure 1 shows the network configuration. A interface + .) Fixed d Network TY SERVER I I Figure 1 : Network
40、configuration 4.2 Routeing principles The call is routed according to the following principles: - a loop i.e. DTE - MS - BSS - visited MSC - SIWF Server - visited MSC - Fixednetwork. This is applicable for both mobile originating or mobile terminating calls. This is called the Loop Method. (Figure 2
41、) a non-loop Le. DTE - MS - BSS - visited MSC - SIWF Server - Fixed network. This is only applicable for mobile originating calls. This is called the Non Loop Method. (Figure 3). - The signalling link between the MSC with SIWFC and the SIWFS is used for normal circuit switched signalling and for con
42、veying additional controlling information via MAP signalling. STD-ETSI TS 101 252-ENGL 1997 = 3400855 0442b42 837 - (GSM 03.54 version 7.0.0 Release 1998) 9 ETSI TS 101 252 V7.0.0 (1999-08) A interface i M S C/VLR/( I W F) I SIWF CONTROLLER Fixed Network A SIWF SERVER Figure 2: The Loop Method. The
43、traffic circuits ?a? and ?n?, where ?a? is used to send and receive data between MS and SIWF Server and ?n? is used to send and receive data of the fixed network A interface I rlpl CONTROLLER Signalling link 4.- ?a? I! I i Figure 3: The Non Loop Method. The traffic circuit ?a? is used to send and re
44、ceive data between MS and SIWF Server STD.ETSI TS 101 252-ENGL lqq9 0 3400855 0442b43 773 (GSM 03.54 version 7.0.0 Release 1998) 10 ETSI TS 1 O1 252 V7.0.0 (1 999-08) 4.3 Visited MSC with additional SIWF functionality (SIWFC) The visited MSC is responsible for allocation of an IWF or a SIWFS. In the
45、 case the visited MSC has the additional functions required to provide a SIWF, this additional functionality in the visited MSC is called SIWFC. SIWFC is a logical part of the MSC. The visited MSC examines IWF Capabilities based on the service request and available resources. The visited MSC compris
46、es of functions for selection of an appropriate SIWFS and the allocation of the traffic channels depending on the SIWF type. In addition to the GSM phase 2 MSC responsibility, the visited MSC including SIWFC is responsible for: - The analysis for the selection of an appropriate SIWFS is based on the
47、 contents in the information received during call Set-up. For this purpose the Visited MSC has the knowledge of routeing information to SIWFS and the service Capabilities on each SIWFS. In addition the operator may specify conditions for redirection. The examination results in that either the MSCIIW
48、F is used (if such exist) or that the call is redirected to a SIWFS. - - - In case the analysis results in that the call shall be routed to a SIWFS, the visited MSC allocate a- circuits for mobile originating calls and n circuits for mobile terminating calls to be used between the MSC and the SIWFS,
49、 and establishing a connection to the SIWFS. The MSC determines via the signalling to the SIWFS, how the call shall be routed i. e. either back to the visited MSC (loop method) or to the final destination (non loop method). This indication is sent in a MAP Procedure. By-passing the SIWFS connection in the Speech part of Alternate services. - - The visited MSC may or may not contain an IWF. 4.4 SIWFS - Shared Inter Working Function Server 4.4.1 General The logical entity that contains the IWU is called SIWF Server (SIWFS). It offers IWU to remotely lo
