1、 ETSI TS 123 153 V15.0.0 (2018-07) Digital cellular telecommunications system (Phase 2+) (GSM); Universal Mobile Telecommunications System (UMTS); LTE; Out of band transcoder control; Stage 2 (3GPP TS 23.153 version 15.0.0 Release 15) TECHNICAL SPECIFICATION ETSI ETSI TS 123 153 V15.0.0 (2018-07)13G
2、PP TS 23.153 version 15.0.0 Release 15Reference RTS/TSGC-0423153vf00 Keywords GSM,LTE,UMTS 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 enregistre la Sous-Prfectur
3、e 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 present document shall not be mod
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9、 TS 123 153 V15.0.0 (2018-07)23GPP TS 23.153 version 15.0.0 Release 15Intellectual Property Rights Essential patents IPRs essential or potentially essential to normative deliverables may have been declared to ETSI. The information pertaining to these essential IPRs, if any, is publicly available for
10、 ETSI 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, essent
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13、 trademark and/or tradename. Mention of those trademarks in the present document does not constitute an endorsement by ETSI of products, services or organizations associated with those trademarks. Foreword This Technical Specification (TS) has been produced by ETSI 3rd Generation Partnership Project
14、 (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 references to the corresponding ETSI deliverables. The cross reference between GSM, UMTS, 3GPP and ETSI identities can b
15、e 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 not“, “can“ and “cannot“ are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for
16、 the expression of provisions). “must“ and “must not“ are NOT allowed in ETSI deliverables except when used in direct citation. ETSI ETSI TS 123 153 V15.0.0 (2018-07)33GPP TS 23.153 version 15.0.0 Release 15Contents Intellectual Property Rights 2g3Foreword . 2g3Modal verbs terminology 2g3Foreword .
17、6g31 Scope 7g32 References 7g33 Definitions and abbreviations . 8g33.1 Definitions 8g33.2 Abbreviations . 11g34 Out-of-Band Transcoder control functionality . 11g34.1 OoBTC Requirements 11g34.2 Relationship between OoBTC and In-band TFO . 12g34.3 Lawful interception 13g35 General Principles 13g35.1
18、Network Model 13g35.2 Simple call set-up . 14g35.3 Media Gateway Control for Codec Handling . 15g35.4 UP Framing Protocol Handling for TrFO . 16g35.4.1 Framing Protocol Initialisation . 16g35.4.2 RFCI Storage 17g35.4.3 RFCI Value Correction . 18g35.4.4 TrFO Break . 18g35.4.5 TrFO Break Recovery . 18
19、g35.4.6 MGW Control Protocol Iu Framing Package properties . 19g35.5 TrFO/TFO Codec Negotiation Harmonisation . 19g35.6 CN Node handling of Codec Types 2 presented to TSG for approval; 3 or greater indicates TSG approved document under change control. y the second digit is incremented for all change
20、s of substance, i.e. technical enhancements, corrections, updates, etc. z the third digit is incremented when editorial only changes have been incorporated in the document. ETSI ETSI TS 123 153 V15.0.0 (2018-07)73GPP TS 23.153 version 15.0.0 Release 151 Scope The present document specifies the stage
21、 2 description of the Out-of-Band Transcoder Control for speech services. It describes the principles and procedures to support Transcoder Free Operation, Tandem Free Operation and the interworking between TrFO and TFO. Transcoder at the edge is also part of the present document. The present documen
22、t specifies functions, procedures and information which apply to GERAN Iu mode. However, functionality related to GERAN Iu mode is neither maintained nor enhanced. 2 References The following documents contain provisions which, through reference in this text, constitute provisions of the present docu
23、ment. - 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 reference to a 3GPP document (
24、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 TS 23.107: “QoS Concept and Architecture“. 2 3GPP TS 24.008: “Mobile radio interface layer 3 specification Core Network Protocols Stage 3“.
25、 3 3GPP TS 25.413: “UTRAN Iu Interface RANAP Signalling“. 4 3GPP TS 25.415: “UTRAN Iu Interface User Plane Protocols“. 5 3GPP TS 26.103: “Speech codec list for GSM and UMTS“. 6 3GPP TS 29.205: “3rd Generation Partnership Project; Technical Specification Group CoreNetwork; Application of Q.1900 serie
26、s to Bearer Independent circuit-switched core Network architecture; Stage 3“. 7 ITU-T Recommendation Q.765.5: “Signalling system No. 7; Application transport mechanism: Bearer Independent Call Control (BICC)“. 8 3GPP TS 23.205: “Bearer-independent CS Core Network.“. 9 3GPP TS 33.106: “3GPP Security;
27、 Lawful Interception Requirements“. 10 3GPP TS 28.062: “Inband Tandem Free Operation (TFO) of Speech Codecs; Service Description; Stage 3“. 11 3GPP TS 23.009: “Handover Procedures“. 12 3GPP TS 29.232: “Media Gateway Controller (MGC) Media Gateway (MGW) interface; Stage 3“. 13 ITU-T H.248: “Gateway C
28、ontrol Protocol“. 14 3GPP TS 29.415: “Customised Applications for Mobile network Enhanced Logic (CAMEL) Phase 3; CAMEL Application Part (CAP) specification“. 15 3GPP TS 48.008: “Mobile-services Switching Centre Base Station System (MSC BSS) interface; layer 3 specification“ 16 3GPP TS 43.051: “Techn
29、ical Specification Group GSM/EDGE; Radio Access Network; Overall description - Stage 2; “ ETSI ETSI TS 123 153 V15.0.0 (2018-07)83GPP TS 23.153 version 15.0.0 Release 1517 3GPP TS 23.172: “Technical realization of Circuit Switched (CS) multimedia service; UDI/RDI fallback and service modification -
30、Stage 2“. 18 3GPP TS 34.108: “Common test environments for User Equipment (UE) conformance testing“. 19 3GPP TS 29.007: “General requirements on interworking between the Public Land Mobile Network (PLMN) and the Integrated Services Digital Network (ISDN) or Public Switched Telephone Network (PSTN)“.
31、 20 3GPP TS 23.231: “SIP-I Based Circuit-Switched Core Network; Stage 2“. 21 3GPP TS 29.231: “ Application of SIP-I Protocols to Circuit Switched (CS) core network architecture; Stage 3“. 22 IETF RFC 4733 “RTP Payload for DTMF Digits, Telephony Tones and Telephony Signals“. 23 IETF RFC 3389: “ Real-
32、time Transport Protocol (RTP) Payload for Comfort Noise (CN)“. 24 IETF RFC 3264: “An Offer/Answer Model with the Session Description Protocol (SDP)“. 25 IETF RFC 4040: “RTP Payload Format for a 64 kbit/s Transparent Call“ 26 ITU-T Recommendation T.38: “Procedures for real-time Group 3 facsimile comm
33、unication over IP networks“ 27 IETF RFC 3362: “Real-time Facsimile (T.38) - image/t38 MIME Sub-type Registration“ 3 Definitions and abbreviations 3.1 Definitions For the purposes of the present document, the following definitions apply: Codec: device to encode information from its original represent
34、ation into an encoded form and to decode encoded information into its original representation Codec Lists, Selected Codecs: The OoBTC procedures pass a number of codec lists created by comparing the capabilities of the different nodes or equipment involved. For the different interfaces involved duri
35、ng call setup, handover, and relocation, the following codec lists and selected codecs need to be distinguished - where codec lists are ordered, “ordered“ is included in the description: 1) Supported Codecs List (DTAP) this is the list of codecs supported by the UE. It is subdivided into codecs supp
36、orted for the currently used radio access and codecs that can be used for other radio accesses supported by the UE. The list contains only the codec types, but not the individual configuration, as the UE is mandated to support all configurations for a given codec type. 2) Supported Codecs List (BSSM
37、AP) - “BSC-SCL“ - this is the list of codecs supported by the BSS (BSS-SCL). The list contains the codec types as well as the individual codec configurations supported by the radio access at the very moment of call setup. 3) Supported Codecs List (BICC) this ordered list is used on NNI (BICC) OoBTC
38、signalling. At call setup it is sent forward by the node originating the OoBTC signalling and contains the default PCM codec and a set of codecs that is common to the nodes and the equipment involved in setting up the call. For a mobile originating call, these are the UE and the MGWs involved in the
39、 connection and, for UTRAN, GERAN Iu-mode and GERAN AoIP mode, also the originating radio access. At inter-MSC relocation and inter-MSC handover, the Supported Codecs List (BICC) is sent forward by the anchor MSC towards the target MSC and contains the default PCM codec and a set of codecs that is c
40、ommon to the anchor MSC and the nodes involved in setting up the new call leg towards the target MSC. For UDI/RDI multimedia calls with fallback and service change according to 3GPP TS 23.172 17, the multimedia dummy codec will be included (see 3GPP TS 26.103 5). 4) Available Codecs List (BICC) this
41、 is the list of codecs available for the NNI connection. It is returned in the backward signalling to the node that originated the OoBTC and is a subset of the Supported Codecs List (BICC) sent forward. At call setup the Available Codecs List (BICC) contains the default PCM codec and a common set ET
42、SI ETSI TS 123 153 V15.0.0 (2018-07)93GPP TS 23.153 version 15.0.0 Release 15of codecs that can be supported by all nodes and, if Transcoder Free Operation has been achieved end-to-end, also by the UEs and the radio access networks that are involved in the call. At inter-MSC relocation and inter-MSC
43、 handover to UMTS, the Available Codecs List (BICC) contains the default PCM codec and a set of codecs that can be supported by all nodes involved in setting up the new call leg towards the target MSC and, if Transcoder Free Operation can be maintained end-to-end after the handover or relocation, al
44、so by the UE and the target radio access network. 5) Selected Codec (BICC) this is the codec selected to be used on the NNI connection. It is one of the codecs contained in the Available Codecs List (BICC) and may be different from the codec that is used on the radio interface, but if end-to-end Tra
45、nscoder Free Operation has been achieved, this will be the common codec for all nodes, the UEs, and the radio accesses. 6) Iu-Supported Codecs List (MAP) this ordered list is used for MAP signalling from the anchor MSC to the target MSC. It is subdivided into lists for UTRAN and GERAN Iu-mode and co
46、ntains the codecs common to the UE and to the anchor MGW for each radio access supported by the UE. The codec capabilities of the serving radio access, i.e. the radio access used prior to the inter-MSC handover or relocation, are not taken into account. Codecs that are only applicable to the NNI, e.
47、g. the default PCM codec or the multimedia dummy codec (see 3GPP TS 26.103 5), are not included. 7) Iu-Available Codecs List (MAP) this is the list of codecs available for the target Iu interface. When returned by the target MSC to the anchor MSC in response to an initial Prepare Handover message it
48、 is the Iu-Supported Codecs List (MAP) reduced according to the capabilites of the target MGW and the target radio access. After a subsequent intra-MSC handover or relocation, the target MSC may update the Iu-Available Codecs List (MAP) according to the capabilites of its associated MGW and the new
49、target radio access, if necessary. 8) Iu-Selected Codec (MAP) this is the codec selected for the target Iu interface. It is one of the codecs contained in the Iu-Available Codecs List (MAP). In response to a Prepare Handover request message this is the codec selected by the target MSC and indicated back to the anchor MSC. When sent from the anchor MSC in a Forward Access Signalling request message during a codec modification, it contains the codec type and configuration chosen by the anchor MSC. 9
