1、 ETSI TS 148 001 V14.0.0 (2017-04) Digital cellular telecommunications system (Phase 2+) (GSM); Base Station System - Mobile-services Switching Centre (BSS - MSC) interface; General aspects (3GPP TS 48.001 version 14.0.0 Release 14) TECHNICAL SPECIFICATION GLOBAL SYSTEM FOR MOBILE COMMUNICATIONSRETS
2、I ETSI TS 148 001 V14.0.0 (2017-04)13GPP TS 48.001 version 14.0.0 Release 14Reference RTS/TSGR-0648001ve00 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 lucrati
3、f enregistre la Sous-Prfecture de Grasse (06) N 7803/88 Important notice The present document can be downloaded from: http:/www.etsi.org/standards-search The present document may be made available in electronic versions and/or in print. The content of any electronic and/or print versions of the pres
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9、ciation. ETSI ETSI TS 148 001 V14.0.0 (2017-04)23GPP TS 48.001 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 E
10、TSI members 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:/
11、ipr.etsi.org/). 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, essentia
12、l to the present 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
13、 as being references 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“, “w
14、ill“, “will 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 148 001 V14.0.0 (2017-04)33GP
15、P TS 48.001 version 14.0.0 Release 14Contents Intellectual Property Rights 2g3Foreword . 2g3Modal verbs terminology 2g3Foreword . 4g31 Scope 5g32 References 5g33 Abbreviations . 6g34 A-Interface capabilities 7g35 A-Interface specification objectives . 7g36 A-Interface characteristics 7g37 Other spec
16、ifications on the MSC-BSS interface 7g37.1 3GPP TS 48.002 Interface Principles . 7g37.2 3GPP TS 48.004 Layer 1 - Specification . 8g37.3 3GPP TS 48.006 Signalling Transport Mechanism - Specification . 8g37.4 3GPP TS 48.008 Layer 3 Specification 8g37.5 3GPP TS 48.020 Rate adaption on the BSS-MSC inter
17、face . 9g3Annex A (informative): Change History 10g3History 11g3ETSI ETSI TS 148 001 V14.0.0 (2017-04)43GPP TS 48.001 version 14.0.0 Release 14Foreword This Technical Specification has been produced by the 3rd Generation Partnership Project (3GPP). The contents of the present document are subject to
18、 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:
19、 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 edito
20、rial only changes have been incorporated in the document. ETSI ETSI TS 148 001 V14.0.0 (2017-04)53GPP TS 48.001 version 14.0.0 Release 141 Scope The present document is an introduction to the 3GPP TS 48.0xx series of Technical Specifications and deals with the definition of the base station system (
21、BSS) to mobile switching centre (MSC) (referred to as the A-interface) defined for the GSM system. It also introduces Technical Specifications in the 3GPP TS 48.020 series, dealing with the support of data services on this interface. The present document gives an overview of the content of the 3GPP
22、TS 48.0xx and 3GPP TS 48.020 series of Technical Specifications explaining how the detailed content of the Technical Specifications is partitioned and how the Technical Specifications can be used to support a full BSS-MSC interface. 2 References The following documents contain provisions which, thro
23、ugh 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 v
24、ersion 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 3GPP TR 21.905: “Vocabulary for 3GPP Specifications“. 2 Void. 3 Void. 4 Void. 5 V
25、oid. 6 Void. 7 Void. 8 Void. 9 Void. 10 Void. 11 Void. 12 Void. 13 Void. 14 Void. 15 Void. 16 Void. 17 Void. 18 Void. 19 Void. ETSI ETSI TS 148 001 V14.0.0 (2017-04)63GPP TS 48.001 version 14.0.0 Release 1420 Void. 21 Void. 22 Void. 23 Void. 24 Void. 25 3GPP TS 44.018: “Mobile radio interface layer
26、3 specification; Radio Resource Control Protocol“. 26 3GPP TS 44.021: “Rate adaption on the Mobile Station - Base Station System (MS - BSS) interface“. 27 3GPP TS 48.002: “Base Station System - Mobile-services Switching Centre (BSS - MSC) interface; Interface principles“. 28 3GPP TS 48.004: “Base St
27、ation System - Mobile-services Switching Centre (BSS - MSC) interface; Layer 1 specification“. 29 3GPP TS 48.006: “Signalling transport mechanism specification for the Base Station System - Mobile-services Switching Centre (BSS - MSC) interface“. 30 3GPP TS 48.008: “Mobile Switching Centre - Base St
28、ation System (MSC - BSS) interface; Layer 3 specification“. 31 3GPP TS 48.020: “Rate adaption on the Base Station System - Mobile-service Switching Centre (BSS - MSC) interface“. 32 Void. 33 Void. 34 Void. 35 Void. 36 Void. 37 Void. 38 Void. 39 Void. 40 Void. 41 Void. 42 Void. 43 Void. 44 Void. 45 V
29、oid. 46 Void. 47 ITU-T Recommendation G.703: “Physical/electrical characteristics of hierarchical digital interfaces“. 3 Abbreviations For the purposes of the present document, the abbreviations given in 3GPP TR 21.905 apply. ETSI ETSI TS 148 001 V14.0.0 (2017-04)73GPP TS 48.001 version 14.0.0 Relea
30、se 144 A-Interface capabilities The BSS-MSC interface shall be capable of supporting all the services offered to GSM users and subscribers. In addition it also allows for the allocation of suitable radio resources within the PLMN, and the operation and maintenance of those resources. 5 A-Interface s
31、pecification objectives The MSC to BSS interface specifications shall allow the following: i) Connection of various manufacturers BSSs to the same MSC; ii) The use of several manufacturers MSCs to the same type of BSS; iii) The use of the same BSS in any PLMN; iv) The use of the same MSC in any PLMN
32、; v) The separate evolution of MSC and BSS technology, and; vi) The separate evolution of O vii) Evolution towards lower speech coding rates; viii) Support of all services defined in the 3GPP TS 02.series. 6 A-Interface characteristics The interface is defined to be at the boundary of the MSC. The M
33、SC to BSS interface is specified by a set of characteristics, including: i) Physical and electromagnetic parameters; ii) Channel structures; iii) Network operating procedures; iv) Operation and Maintenance information support. The definition of the MSC to BSS interface follows a layered approach sim
34、ilar to that in the ISDN. Layer 3 is for the most part based on 3GPP TS 44.018 with additional procedures added for the control of radio resources and the identification of transactions using the SCCP. Layer 2 is based on the Signalling System No.7 (SS7) Message Transfer Part (MTP) , or in the case
35、of IP-based signalling transport - M3UA and SCTP. In case of SS7 MTP, layer 1 is either digital (at 2 048 kbit/s, based on ITU-T Recommendation G.703 clause 6) or analogue with the data being passed by the use of modems (this latter case is a national option). 7 Other specifications on the MSC-BSS i
36、nterface The full structure of the Technical Specifications specifying the MSC to BSS link are as follows. 7.1 3GPP TS 48.002 Interface Principles The present document deals with the functional split between the BSS and the MSC. This functional split is then supported by the other Technical Specific
37、ations in the 3GPP TS 48.0xx series. 3GPP TS 48.002 also contains some information on the placement of transcoders/rate adapters, these being functionally part of the BSS though a degree of freedom is allowed in their geographical location. ETSI ETSI TS 148 001 V14.0.0 (2017-04)83GPP TS 48.001 versi
38、on 14.0.0 Release 14In the case of A interface user plane over IP, transcoders in the BSS may not be needed. Lastly 3GPP TS 48.002 explains the use of transparent and non transparent signalling information across the interface. The key point is that the majority of call related signalling from the M
39、S is passed in a fairly transparent way through the BSS. 7.2 3GPP TS 48.004 Layer 1 - Specification The present document defines the physical layer at the BSS-MSC interface point. The physical interface chosen is either a 2 Mbits/s (32 x 64kbits/s) interface according to the standard ITU-T recommend
40、ations or an IP transport based interface according to the standard IETF RFCs. The speech coding called up in the present document is either according to ITU-T G.711 or according to Codecs listed in 3GPP TS 26.103. The coding of the traffic bit streams for data calls is dealt with in 3GPP TS 44.021
41、and 3GPP TS 48.020. 7.3 3GPP TS 48.006 Signalling Transport Mechanism - Specification In order to pass the signalling information between BSS and MSC some reliable transport mechanism has to be used. The basis of the transport mechanism is an internationally agreed protocol known as signalling syste
42、m No.7. Several services are required from this protocol but two key requirements are that messages can be transferred between the BSS and MSC without corruption, and secondly that a transaction with a particular mobile can be identified. The correct transfer of messages without corruption is handle
43、d by the “Message Transfer Part“, or in the case of IP-based signalling transport - M3UA and SCTP, of SS7 and this is documented in 3GPP TS 48.006 which is an exceptions document to the ITU-T, ANSI and IETF specifications. The subset so formed is designed so that it is compatible with a “full“ MTP (
44、M3UA/SCTP) such as might be provided at an MSC. For IP-based signalling transport, the involved nodes may take the role of a client or a server with respect to establishing the end-to-end communication. The particular role of the nodes is either determined by configuration or is depending on which p
45、eer is acting first in establishing the communication, by that acting as the client. The identification of the transaction involved implies some form of logical connection. This is achieved by using the Signalling Connection Control Part (SCCP) of SS7. Again a minimum subset is formed in order to ea
46、se implementation. 7.4 3GPP TS 48.008 Layer 3 Specification In the present document the application parts are described. There are two currently identified in the BSS to MSC interface protocol, these are the: - BSSOMAP; - BSSAP. The BSSAP is further subdivided into two subprotocols, the BSSMAP and t
47、he DTAP. The BSSMAP and DTAP are fully defined, the BSSOMAP is only supported in terms of a signalling transport ability. The DTAP text is split between 3GPP TS 48.006 and 3GPP TS 48.008 but the text in 3GPP TS 48.008 defines which layer 3 air interface messages are passed transparently through the
48、BSS and which are analysed at the BSS. The BSSMAP (base station system management application part) is that part of the protocol responsible for all aspects of the radio resource handling at the BSS. The text is structured as a set of procedures which are defined separately and can be employed as fe
49、lt appropriate by the operator/manufacturer to meet the requirements of the application in which it is being used. The procedures themselves can be driven in different modes depending upon the input parameters received from the MSC or sent from the OMC. ETSI ETSI TS 148 001 V14.0.0 (2017-04)93GPP TS 48.001 version 14.0.0 Release 14The BSSOMAP (base station system operation and maintenance application part) supports all of the O and M communications for the BSS with either the M
