1、STD-ETSI GSM 0S.OB-ENGL 1997 m 3400855 0194027 52b M GSM GSM 09.08 April 1997 Version 5.1 .O Source: ETSI TC-SMG Reference: TS/SMG-O30908QR ICs: 33.020 Key words: Digital cellular telecommunications system, Global System for Mobile communications (GSM) Digital cellular telecommunications system; App
2、lication of the Base Station System Application Part (BSSAP) on the E-interface (GSM 09.08) ETSI European Telecommunications Standards Institute ETSI Secretariat Postal address: F-O6921 Sophia Antipolis CEDEX - FRANCE Office address: 650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCE X.40
3、0: c=fr, a=atlas, p=etsi, s=secretariat - Internet: secretariatetsi.fr Tel.: +33 4 92 94 42 O0 - 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. O Eur
4、opean Telecommunications Standards Institute 1997. All rights resewed. Page 2 GSM 09.08 version 5.1 .O: 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 accur
5、acy, please write to “ETSI Editing and Committee Support Dept.“ at the address shown on the title page. STDOETSI GSM 07.08-ENGL 1997 3400855 OL94031 144 Page 3 GSM 09.08 version 5.1 .O. April 1997 Contents Foreword . 5 1 Scope 7 2 Normative references 7 3 Abbreviations . 7 4 Principles for the use o
6、f BSSAP on the E-interface 8 4.1 General 8 4.2 Transfer of DTAP and BSSMAP layer 3 messages on the E-interface . 8 4.3 Roles of MSC.A. MSC-I and MSC-T . 8 5 Use of the BSSAP on the E-interface 9 5.1 DTAP . 9 5.2 Assignment 9 5.3 Handover resource allocation 9 5.4 Handover execution . 10 5.5 Internal
7、 handover indication . 10 5.6 Release due to BSS generated reasons 10 5.7 Classmark handling . 10 5.8 Cipher mode control 1 0 5.9 Trace invocation . 10 5.1 O Queuing indication . 11 5.1 1 Data link control SAPI not equal to “O“ . 11 6 7 BSSMAP messages transferred on the E-interface 11 Exceptions fo
8、r BSSMAP message contents and information element coding when transferred on the E-interface . 12 7.2 Information element coding . 13 7.1 Message contents 12 8 BSSAP message error handling when transferred on the E-interface 13 History 14 STD-ETSI GSM 09.OB-ENGL 3997 3400855 0394032 010 Page 5 GSM 0
9、9.08 version 5.1 .O: April 1997 Foreword This Global System for Mobile communications Technical Specification (GTS) has been produced by the Special Mobile Group (SMG) Technical Committee (TC) of the European Telecommunications Standards Institute (ETSI). This GTS describes the subset of Base Statio
10、n System Application Part (BSSAP) messages and procedures within the digital cellular telecommunications system. The contents of this GTS are subject to continuing work within TC-SMG and may change following formal TC-SMG approval. Should TC-SMG modify the contents of this GTS it will then be republ
11、ished 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, .e.
12、technical enhancements, corrections, updates, etc. The specification from which this GTS has been derived was originally based on CEPT documentation, hence the presentation of this GTS may not be entirely in accordance with the ETSVPNE Rules. Previous page is blank I STD-ETSI GSfl 09.0-ENGL 1997 340
13、0855 Ol19V033 T57 W Page 7 GSM 09.08 version 5.1 .O: April 1997 1 Scope This Global System for Mobile communications Technical Specification (GTS) describes the subset of Base Station System Application Part (BSSAP) messages and procedures, defined in GSM 08.06 and GSM 08.08, which is used on the E-
14、interface. A general description can be found in GSM 03.02 and GSM 03.09. For the initiation and execution of handover between MSCs a subset of BSSMAP procedures are used. For the subsequent control of resources allocated to the Mobile Station (MS) BSSMAP procedures are used. DTAP is used for the tr
15、ansfer of connection management and mobility management messages between the MS and the controlling MSC. 2 Normative references This GTS incorporates by dated and undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the
16、 publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this GTS only when incorporated in it by amendment or revision. For undated references, the latest edition of the publication referred to applies. 31 41 GSM O1 .O4 (E
17、TR 350): “Digital cellular telecommunications system (Phase 2+); Abbreviations and acronyms“. GSM 03.09: “Digital cellular telecommunications system (Phase 2+); Handover procedures“. GSM 08.06: “Digital cellular telecommunications system; Signalling transport mechanism specification for the Base Sta
18、tion System - Mobile-services Switching Centre (BSS - MSC) interface“. GSM 08.08: “Digital cellular telecommunications system (Phase 2+); Mobile Switching Centre - Base Station System (MSC - BSS) interface; Layer 3 specification“. GSM 09.02 (ETS 300 974): “Digital cellular telecommunications system
19、(Phase 2+); Mobile Application Part (MAP) specification“. GSM 09.1 O: “Digital cellular telecommunications system (Phase 2+); Information element mapping between Mobile Station - Base Station System and BSS - Mobile-services Switching Centre (MS - BSS - MSC); Signalling procedures and the Mobile App
20、lication Part (MAP)“. 3 Abbreviations For the purposes of this GTS, the following abbreviations apply: BSS BSSAP BSSMAP CCCH DLCI DTAP MSC MSC-A MSC-I MSC-T SAP I SCCP TCAP Base Station System Base Station System Application Part Base Station System Management Application Part Common Control CHannel
21、 Data Link Connection Identifier Direct Transfer Application Part Mobile-services Switching Centre Mobile-services Switching Centre, Anchor (Anchor MSC) Mobile-services Switching Centre, Intermediate (Intermediate MSC) Mobile-services Switching Centre, Target (Target MSC) Service Access Point Identi
22、fier Signalling Connection Control Part Transaction Capabilities Application Part Other abbreviation used in the GSM specifications are listed in GSM 01.04. Previous page is blank STDmETSI GSM 09.08-ENGL 1997 m 3400855 0394034 993 m Page 8 GSM 09.08 version 5.1 .O: April 1997 4 Principles for the us
23、e of BSSAP on the E-interiace 4.1 General The mechanisms for the transfer of the BSSAP messages on the E-interface is defined in GSM 09.02. The operation of the handover procedures between MSCs and the use of the BSSMAP messages for those procedures is described in GSM 03.09 and GSM 09.1 O. In the s
24、ame way as a SCCP signalling connection is used for the messages relating to one MS on the MSC-BSS interface a TCAP dialogue is used on the E-interface for messages relating to one MS. As no correspondence to the connectionless service on the MSC-BSS interface is used on the E-interface none of the
25、global procedures (see GSM 08.08 subclause 3.1) are applicable. The management of the terrestrial circuits between the MSCs is outside the scope of the E-interface (see GSM 03.09), therefore all procedures, messages and information elements relating to terrestrial circuits are also excluded from the
26、 BSSMAP procedures and messages used on the E-interface. 4.2 Transfer of DTAP and BSSMAP layer 3 messages on the E-interface The BSSAP data which on the MSC-BSS interface is contained in the user data field of the exchanged SCCP frames (see GSM 08.06) is on the E-interface transferred as the content
27、s of the signalling info in a BSS-APDU parameter as described in GSM 09.02. The BSSAP data consists of a BSSAP header and a DTAP or BSSMAP layer 3 message. The BSSAP header contains, as specified in GSM 08.06 (subclauses 6.3.1, 6.3.2 and 6.3.3), of a discrimination parameter, possibly a Data Link Co
28、nnection Identification (DLCI) parameter, and a length indicator. 4.3 Roles of MSC-A, MSC-I and MSC-T For the description in this ETS, the MSCs functionality related to the handover between MSCs has been split into three logical parts, MSC-A, MSC-T and MSC-I. The different roles need not necessarily
29、 be performed by different MSCs. MSC-A is the calkonnection controlling part of the MSC where the call/connection was originally established and the switching point for handover between MSCs. (This corresponds to MSC-A as defined in GSM 03.09 and 09.02). The MSC that is the MSC-A will not be changed
30、 during the duration of a cal lho n nect io n . MSC-T is the part relating to the transitory state during the handover for the MSC to which the MS is handed over when Basic handover or Subsequent handover (see GSM03.09) take place. (This corresponds, depending on the type of handover to MSC-A, MSC-B
31、 or MSC-B in GSM 03.09 and 09.02). MSC-I is the part of an MSC through which the MSC-A, via an E-interface (or an internal interface) is in contact with the MS. (This corresponds, depending on the type of handover to MSC-A, MSC-B or MSC-B in GSM 03.09 and 09.02). The MSC that is the MSC-A can also h
32、ave the role of either the MSC-I or the MSC-T during a period of the call/connection. The following is applicable for the involved MSCs concerning the exchange of BSSAP data on an E-interface before and after a successful inter MSC handover: 1) At Basic handover, two MSCs are involved, one MSC being
33、 MSC-A and one being MSC-T. When this handover has been performed, the two MSCs interworking on the E-interface have the roles of MSC-A and MSC-I respectively, .e. the MSC that is the MSC-T during the handover is now the MSC-I. 2) At Subsequent handover back to MSC-A, two MSCs are involved. The MSC
34、having the role of MSC-A has also the role of MSC-T. The other MSC involved has the role of MSC-I. When this handover has been completed, there is no exchange of BSS data on the E-interface, .e. the MSC being the MSC-I before and during the handover is now no longer taking part. - STD-ETSI GSM 09.08
35、-ENGL 1997 = 3400855 0194035 82T Page 9 GSM 09.08 version 5.1 .O: April 1997 At subsequent handover to an MSC not being MSC-A, three MSCs are involved. The roles of these MSCs are MSC-A, MSC-I, and MSC-T respectively. When this handover has been performed, the two MSCs interworking on an E-interface
36、 have the roles of MSC-A and MSC-I respectively, .e. the MSC that is the MSC-T during the handover is now the MSC-I and the MSC being MSC-I during the handover is now no longer taking part. 3) 5 Use of the BSSAP on the E-interface DTAP is used on the E-interface for the transfer of messages between
37、the MSC-A and the MS. The dedicated BSSMAP procedures (GSM 08.08 subclause 3.1) used on the E-interface to some extent are: assignment; handover resource allocation; handover execution; internal handover indication; release due to BSS generated reasons; classmark handling; cipher mode control; trace
38、 invocation; queuing indication; data link control SAPI not equal to “O“. 5.1 DTAP For the exchange of the DTAP messages (GSM08.08 subclause 2.2), the involved MSCs shall act according to the following: - - the MSC-A acts as the MSC; the MSC-I acts as the BSS. 5.2 Assignment The Assignment procedure
39、 (GSM 08.08 subclause 3.1 .l) is applied on the E-interface with following conditions: - - the MSC-A acts as the MSC; the MSC-I acts as the BSS. The handling of terrestrial resources is not applicable. 5.3 Handover resource allocation At Basic Inter-MSC Handover (GSM 03.09) the Handover resource all
40、ocation procedure (GSM 08.08 subclause 3.1.5.2) is applied on the E-interface with the following conditions: - - the MSC-A acts as the MSC; the MSC-T acts as the target BSS. At Subsequent Inter-MSC Handover (GSM 03.09) the Handover resource allocation procedure (GSM 08.08 subclause 3.1.5.2) is appli
41、ed on the E-interface with the following conditions: - - - the MSC-I acts as the MSC; the MSC-T acts as the BSS; if the MSC that is the MSC-A is not also the MSC-T, then this MSC shall act as the target BSS towards the MSC-I and as the MSC towards the MSC-T. The handling of terrestrial resources is
42、not applicable. STB-ETSI GSM 07-08-ENGL 1777 ? 3400855 0374036 766 ? Page 10 GSM 09.08 version 5.1 .O: April 1997 5.4 Handover execution For the Handover execution procedure (GSM 08.08 subclause 3.1 -5.3) the applicable parts on the E-interface are the transfer of HANDOVER DETECT, HANDOVER COMPLETE
43、and HANDOVER FAILURE messages at inter MSC handover. For those parts, the involved MSCs shall act according to the following: - - - the MSC that is the MSC-A, acts as the MSC; the MSC that is the MSC-I, if it is not also the MSC-A, acts as the serving BSS; the MSC that is the MSC-T, if it is not als
44、o the MSC-A, acts as the target BSS. 5.5 Internal handover indication For the Internal handover indication (GSM 08.08 subclause 3.1.6 and 3.1.7), the involved MSCs shall act according to the following: - - the MSC-A acts as the MSC; the MSC-I acts as the BSS. MSC internal handovers (inter-BSS and in
45、tra-BSS handover) at the MSC-I are decided and executed autonomously by that MSC together with the connected BSSs. At completion of the handover execution the MSC-I initiates the internal handover indication procedure. 5.6 Release due to BSS generated reasons For the Release due to BSS generated rea
46、sons procedure (GSM 08.08 subclause 3.1.9.2) the involved MSCs shall act according to the following: - - the MSC-I acts as the BSS; no further action is taken by the MSC-A. 5.7 Classmark handling For the Classmark handling (GSM 08.08 subclause 3.1.13), the involved MSCs shall act according to the fo
47、llowing: - - the MSC-A acts as the MSC; the MSC-I acts as the BSS. 5.8 Cipher mode control For the Cipher mode control (GSM 08.08 subclause 3.1.14), the involved MSCs shall act according to the following: - - the MSC-A acts as the MSC; the MSC-I acts as the BSS. 5.9 Trace invocation For the Trace in
48、vocation (GSM 08.08 subclause 3.1.1 l), the involved MSCs shall act according to the following: - - the MSC-A acts as the MSC; the MSC-I acts as the BSS. STD-ETSI GSM 07-08-ENGL 1997 3400855 0194037 bT2 Page 11 GSM 09.08 version 5.1 .O: April 1997 5.10 Queuing indication For the Queuing Indication (
49、GSM 08.08 subclause 3.1.17), the involved MSCs shall act according to the following: - at Assignment and at Basic Inter-MSC handover: - - the MSC-A acts as the MSC; the MSC-I acts as the BSS. - at Subsequent Inter-MSC handover: - - - the MSC-I acts as the MSC; the MSC-T acts as the BSS; if the MSC that is the MSC-A is not also the MSC-T, then this MSC acts as the target BSS towards the MSC-I and as the MSC towards the MSC-T. 5.1 1 Data link control SAPI not equal to “O“ For the Data Link Control SAPI not Equal to “O“ (GSM 08.08 subclause 3.1.18), the involved MS
