1、 ETSI TS 149 008 V14.0.0 (2017-04) Digital cellular telecommunications system (Phase 2+) (GSM); Application of the Base Station System Application Part (BSSAP) on the E interface (3GPP TS 49.008 version 14.0.0 Release 14) TECHNICAL SPECIFICATION GLOBAL SYSTEM FOR MOBILE COMMUNICATIONSRETSI ETSI TS 1
2、49 008 V14.0.0 (2017-04)13GPP TS 49.008 version 14.0.0 Release 14Reference RTS/TSGC-0149008ve00 Keywords GSM ETSI 650 Route des Lucioles F-06921 Sophia Antipolis Cedex - FRANCE Tel.: +33 4 92 94 42 00 Fax: +33 4 93 65 47 16 Siret N 348 623 562 00017 - NAF 742 C Association but non lucratif enregistr
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9、SI ETSI TS 149 008 V14.0.0 (2017-04)23GPP TS 49.008 version 14.0.0 Release 14Intellectual Property Rights IPRs essential or potentially essential to the present document may have been declared to ETSI. The information pertaining to these essential IPRs, if any, is publicly available for ETSI members
10、 and non-members, and can be found in ETSI SR 000 314: “Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in respect of ETSI standards“, which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web server (https:/ipr.etsi.or
11、g/). 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 ETSI SR 000 314 (or the updates on the ETSI Web server) which are, or may be, or may become, essential to the pr
12、esent document. Foreword This Technical Specification (TS) has been produced by ETSI 3rd Generation Partnership Project (3GPP). The present document may refer to technical specifications or reports using their 3GPP identities, UMTS identities or GSM identities. These should be interpreted as being r
13、eferences to the corresponding ETSI deliverables. The cross reference between GSM, UMTS, 3GPP and ETSI identities can be found under http:/webapp.etsi.org/key/queryform.asp. Modal verbs terminology In the present document “shall“, “shall not“, “should“, “should not“, “may“, “need not“, “will“, “will
14、 not“, “can“ and “cannot“ are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of provisions). “must“ and “must not“ are NOT allowed in ETSI deliverables except when used in direct citation. ETSI ETSI TS 149 008 V14.0.0 (2017-04)33GPP TS 49.008
15、 version 14.0.0 Release 14Contents Intellectual Property Rights 2g3Foreword . 2g3Modal verbs terminology 2g3Foreword . 4g31 Scope 5g32 References 5g33 Abbreviations . 6g34 Principles for the use of BSSAP on the E-interface . 6g34.1 General . 6g34.2 Transfer of DTAP and BSSMAP layer 3 messages on the
16、 E-interface 6g34.3 Roles of MSC-A, MSC-I and MSC-T 7g35 Use of the BSSAP on the E-interface . 7g35.1 DTAP . 8g35.2 Assignment . 8g35.3 Handover resource allocation . 8g35.4 Handover execution 8g35.5 Internal handover indication . 9g35.6 Release due to BSS generated reasons . 9g35.7 Classmark handli
17、ng 9g35.8 Cipher mode control . 9g35.9 Trace invocation . 9g35.10 Queuing indication . 10g35.11 Data link control SAPI not equal to “0“ . 10g35.12 Location Acquisition 10g35.13 LSA handling . 10g35.14 Common ID 10g35.15 Service Change procedure 11g36 BSSMAP messages transferred on the E-interface 11
18、g37 Exceptions for BSSMAP message contents and information element coding when transferred on the E-interface 12g37.1 Message contents 12g37.2 Information element coding . 14g38 BSSAP message error handling when transferred on the E-interface 14g3Annex A (informative): Change history . 15g3History 1
19、8g3ETSI ETSI TS 149 008 V14.0.0 (2017-04)43GPP TS 49.008 version 14.0.0 Release 14Foreword This Technical Specification (TS) has been produced by the 3rdGeneration Partnership Project (3GPP). The present document provides a mechanism giving reliable transfer of signalling messages within the 3GPP sy
20、stem. 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 n
21、umber 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,
22、updates, etc. z the third digit is incremented when editorial only changes have been incorporated in the document. ETSI ETSI TS 149 008 V14.0.0 (2017-04)53GPP TS 49.008 version 14.0.0 Release 141 Scope The present document describes the subset of Base Station System Application Part (BSSAP) messages
23、 and procedures, defined in 3GPP TS 48.006 and 3GPP TS 48.008, which is used on the E-interface. A general description can be found in 3GPP TS 23.002 and 3GPP TS 23.009. For the initiation and execution of handover between MSCs a subset of BSSMAP procedures are used. For the subsequent control of re
24、sources allocated to the Mobile Station (MS) BSSMAP procedures are used. DTAP is used for the transfer of connection management and mobility management messages between the MS and the controlling MSC. 2 References The following documents contain provisions which, through reference in this text, cons
25、titute 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
26、 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 Void. 1a 3GPP TR 21.905: “Vocabulary for 3GPP Specifications“. 2 3GPP TS 23.009: “Handover procedures“. 2a 3GPP T
27、S 23.002: “Network Architecture“. 3 3GPP TS 48.006: “Signalling transport mechanism specification for the Base Station System - Mobile-services Switching Centre (BSS - MSC) interface“. 4 3GPP TS 48.008: “Mobile-services Switching Centre - Base Station System (MSC - BSS) interface; Layer 3 specificat
28、ion“. 5 3GPP TS 29.002: “Mobile Application Part (MAP) specification“. 6 3GPP TS 29.010: “Information element mapping between Mobile Station - Base Station System (MS - BSS) and Base Station System - Mobile-services Switching Centre (BSS - MSC); Signalling procedures and the Mobile Application Part
29、(MAP)“. 7 3GPP TS 23.172: “Technical realization of Circuit Switched (CS) multimedia service; UDI/RDI fallback and service modification; Stage 2)“. 8 3GPP TS 25.413: “UTRAN Iu interface Radio Access Network Application Part (RANAP) signalling“. ETSI ETSI TS 149 008 V14.0.0 (2017-04)63GPP TS 49.008 v
30、ersion 14.0.0 Release 143 Abbreviations For the purposes of the present document, the abbreviations defined in 3GPP TR 21.905 1a and the following apply: BSS Base Station System BSSAP Base Station System Application Part BSSMAP Base Station System Management Application Part CCCH Common Control CHan
31、nel DLCI Data Link Connection Identifier DTAP Direct Transfer Application Part MSC Mobile-services Switching Centre MSC-A Mobile-services Switching Centre, Anchor (Anchor MSC) MSC-I Mobile-services Switching Centre, Intermediate (Intermediate MSC) MSC-T Mobile-services Switching Centre, Target (Targ
32、et MSC) SAPI Service Access Point Identifier SCCP Signalling Connection Control Part TCAP Transaction Capabilities Application Part 4 Principles for the use of BSSAP on the E-interface 4.1 General The mechanisms for the transfer of the BSSAP messages on the E-interface is defined in 3GPP TS 29.002 5
33、. The operation of the handover procedures between MSCs and the use of the BSSMAP messages for those procedures is described in 3GPP TS 23.009 2 and 3GPP TS 29.010 6. In the same way as a SCCP signalling connection is used for the messages relating to one MS on the MSC-BSS interface a TCAP dialogue
34、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 global procedures (see 3GPP TS 48.008 4 subclause 3.1) are applicable. The management of the terrestrial circuits and IP conn
35、ections between the MSCs is outside the scope of the E-interface (see 3GPP TS 23.009 2), therefore all procedures, messages and information elements relating to terrestrial circuits or IP connections are also excluded from the BSSMAP procedures and messages used on the E-interface. 4.2 Transfer of D
36、TAP 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 3GPP TS 48.006) is on the E-interface transferred as the contents of the signalling info in a BSS-APDU parameter as described in 3GPP
37、 TS 29.002. The BSSAP data consists of a BSSAP header and a DTAP or BSSMAP layer 3 message. The BSSAP header contains, as specified in 3GPP TS 48.006 (subclauses 6.3.1, 6.3.2 and 6.3.3), of a discrimination parameter, possibly a Data Link Connection Identification (DLCI) parameter, and a length indi
38、cator. ETSI ETSI TS 149 008 V14.0.0 (2017-04)73GPP TS 49.008 version 14.0.0 Release 144.3 Roles of MSC-A, MSC-I and MSC-T For the description in the present document, the MSCs functionality related to the handover between MSCs has been split into three logical parts, MSC-A, MSC-T and MSC-I. The diff
39、erent roles need not necessarily be performed by different MSCs. MSC-A is the call/connection 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 3GPP TS 23.009 and 3GPP TS 29.002
40、). The MSC that is the MSC-A will not be changed during the duration of a call/connection. 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 3GPP TS 23.009) take place. (This corresponds,
41、depending on the type of handover to MSC-A, MSC-B or MSC-B in 3GPP TS 23.009 and 3GPP TS 29.002). 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-
42、B in 3GPP TS 23.009 and 3GPP TS 29.002). The MSC that is the MSC-A can also have 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 i
43、nter MSC handover: 1) At Basic handover, two MSCs are involved, one MSC being 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, i.e. the MSC that is the MSC-T during the handover is now the M
44、SC-I. 2) At Subsequent handover back to MSC-A, two MSCs are involved. The MSC 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, i.e. the MSC being the MSC-I be
45、fore and during the handover is now no longer taking part. 3) 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 have the roles
46、 of MSC-A and MSC-I respectively, i.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. 5 Use of the BSSAP on the E-interface DTAP is used on the E-interface for the transfer of messages between the MSC-A and the
47、 MS. The dedicated BSSMAP procedures (3GPP TS 48.008 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; - t
48、race invocation; - queuing indication; - data link control SAPI not equal to “0“; ETSI ETSI TS 149 008 V14.0.0 (2017-04)83GPP TS 49.008 version 14.0.0 Release 14- Location Acquisition; - LSA handling; - Common ID. One dedicated BSSMAP procedure is used only on the E-interface: - Service Change (subc
49、lause 5.15). 5.1 DTAP For the exchange of the DTAP messages (3GPP TS 48.008 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 (3GPP TS 48.008 subclause 3.1.1) 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 (3GPP TS 23.009) the Handover
