1、 ETSI TS 123 172 V15.0.0 (2018-07) Universal Mobile Telecommunications System (UMTS); Technical realization of Circuit Switched (CS) multimedia service UDI/RDI fallback and service modification; Stage 2 (3GPP TS 23.172 version 15.0.0 Release 15) TECHNICAL SPECIFICATION ETSI ETSI TS 123 172 V15.0.0 (
2、2018-07)13GPP TS 23.172 version 15.0.0 Release 15Reference RTS/TSGC-0323172vf00 Keywords 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-Prfec
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9、TSI TS 123 172 V15.0.0 (2018-07)23GPP TS 23.172 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
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14、ect (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 ca
15、n 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 not“, “can“ and “cannot“ are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms
16、for the expression of provisions). “must“ and “must not“ are NOT allowed in ETSI deliverables except when used in direct citation. ETSI ETSI TS 123 172 V15.0.0 (2018-07)33GPP TS 23.172 version 15.0.0 Release 15Contents Intellectual Property Rights 2g3Foreword . 2g3Modal verbs terminology 2g3Foreword
17、 . 5g31 Scope 6g32 References 6g33 Definitions and abbreviations . 7g33.1 Definitions 7g33.2 Abbreviations . 7g34 Service change and fallback for UDI/RDI multimedia 7g34.1 General Requirements 7g34.2 Access Call Control Signalling 8g34.2.1 Mobile originating side - initiation of call setup . 8g34.2.
18、1.1 Subscription checking . 9g34.2.1.1.1 Send Info For Outgoing Call . 9g34.2.1.1.2 Complete Call 9g34.2.2 Mobile terminating side 10g34.2.2.1 Subscription checking . 11g34.2.2.1.1 Send Info For Incoming Call . 11g34.2.2.1.2 Complete Call 11g34.2.3 Mobile originating side - completion of call setup
19、. 11g34.2.4 User-initiated Service change in the active state. 13g34.2.5 Network-initiated Service change in the active state 14g34.2.5.1 Network-initiated Service change in the active state starting with multimedia in Iu mode 16g34.2.5.2 Network-initiated Service change in the active state starting
20、 with speech in Iu mode 17g34.3 Core Network procedures . 22g34.3.1 Multimedia codec . 23g34.3.2 Originating side - initiation of call setup 23g34.3.2.1 Originating MSC Handling . 23g34.3.2.2 VMSC Handling at Originating Side 24g34.3.3 Terminating side . 24g34.3.3.1 HLR Interrogation . 24g34.3.3.1.1
21、 Send Routing Info 24g34.3.3.1.2 Send Routing Info Ack 25g34.3.3.1.3 Handling of mobile terminating calls in the HLR . 25g34.3.3.1.4 Handling of mobile terminating calls in the GMSC 33g34.3.3.1a GMSC Handling at Terminating Side . 36g34.3.3.2 Terminating MSC Handling 36g34.3.4 Originating side - com
22、pletion of call setup . 39g34.3.5 Service change during the active state 40g34.3.5.1 Mid-Call Codec Modification Procedure For Service Change . 41g34.3.5.2 Unsuccessful Service Change . 51g34.3.6 Interaction with supplementary services . 55g34.3.6.1 Call forwarding and Call deflection 55g34.3.6.2 Cl
23、osed User Group (CUG) 56g34.3.6.3 Call barring . 56g34.3.7 Interactions with CAMEL 56g34.3.7.1 Interaction at call setup . 56g34.3.7.2 Interaction at call answer 56g34.3.7.3 Interaction with Call Party Handling. 56g34.3.7.4 Interaction with CAMEL in-band information and user interaction . 56g34.3.7.
24、5 Interaction during service change . 57g34.3.8 Interworking with external networks 57g34.3.9 User interaction and in-band information . 57g3ETSI ETSI TS 123 172 V15.0.0 (2018-07)43GPP TS 23.172 version 15.0.0 Release 155 Lawful Interception 58g3Annex A (informative): Change history . 59g3History 60
25、g3ETSI ETSI TS 123 172 V15.0.0 (2018-07)53GPP TS 23.172 version 15.0.0 Release 15Foreword This Technical Specification has been produced by the 3rdGeneration Partnership Project (3GPP). The contents of the present document are subject to continuing work within the TSG and may change following formal
26、 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: 1 presented to TSG for information; 2 presented to TSG for app
27、roval; 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 editorial only changes have been incorporated in the document. ETSI
28、ETSI TS 123 172 V15.0.0 (2018-07)63GPP TS 23.172 version 15.0.0 Release 151 Scope The present document describes the Service Change and UDI Fallback (SCUDIF) feature. This service is available to UDI/RDI multimedia calls and allows users to achieve successful call establishment when end to end circu
29、it-switched (CS) multimedia is not possible (fallback to speech) or when signalling of the feature is not possible in the network (fallback to preferred service or speech). Furthermore, it allows the users to swap between a multimedia service and basic speech during an established call. NOTE: In the
30、 present document, the term “multimedia“ refers to UDI/RDI multimedia unless specifically stated. 2 References The following documents contain provisions, which, through reference in this text, constitute provisions of the present document. References are either specific (identified by date of publi
31、cation and/or edition number or version number) 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 (including a GSM document), a non-specific reference implicitly refers
32、 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 3GPP TS 23.153: “Out of Band Transcoder Control; Stage 2“. 3 3GPP TS 24.008: “Mobile Radio Interface Layer 3 specification; Core network protocols; Stage 3“.
33、 4 3GPP TS 26.103: “Speech Codec List for GSM and UMTS“. 5 3GPP TS 27.001: “General on Terminal Adaptation Functions (TAF) for Mobile Stations (MS)“. 6 3GPP TS 29.007: “General requirements on interworking between the Public Land Mobile Network (PLMN) and the Integrated Services Digital Network (ISD
34、N) or Public Switched Telephone Network (PSTN)“. 7 3GPP TS 29.205: “Application of Q.1900 series to bearer-independent circuit-switched core network architecture; Stage 3“. 8 3GPP TS 22.101: “Service aspects; Service principles“. 9 3GPP TS 33.106: “3GPP Security; Lawful Interception Requirements“. 1
35、0 3GPP TS 23.018: “Basic Call Handling; Technical realization“. 11 3GPP TS 23.003: “Numbering, adressing and identification“. 12 3GPP TS 29.232: “Media Gateway Controller (MGC) Media Gateway (MGW) Interface; Stage 3“. 13 3GPP TS 26.102: “Mandatory Speech Codec; AMR Speech Codec; Interface to Iu, Uu,
36、 Nb“. 14 3GPP TS 23.078: “Customised Applications for Mobile network Enhanced Logic (CAMEL) ; Stage 2“. 15 3GPP TS 23.082: “Call Forwarding (CF) supplementary services, Stage 2“. 16 3GPP TS 22.078: “Customised Applications for Mobile network Enhanced Logic (CAMEL); Service description, Stage 1“. 17
37、3GPP TS 25.413: “UTRAN Iu interface RANAP signalling“. ETSI ETSI TS 123 172 V15.0.0 (2018-07)73GPP TS 23.172 version 15.0.0 Release 1518 IETF RFC 4040: “RTP Payload Format for a 64 kbit/s Transparent Call“ 3 Definitions and abbreviations 3.1 Definitions For the purposes of the present document, the
38、terms and definitions given in 3GPP TR 21.905 1 and the following apply: fallback: when two services (multimedia and speech) are proposed but only one of them is available or wanted, only the service available (preferred or less preferred) is selected, and the other one is discarded service change:
39、when two services (multimedia and speech) are available during the active state of a call, users may request a service change to switch between the two services 3.2 Abbreviations For the purposes of the present document, the abbreviations given in 3GPP TR 21.905 1 and the following apply: BC Bearer
40、Capability BC1 First Bearer Capability in a message (preferred service) BC2 Second Bearer Capability in a message (less preferred service) BCa Bearer Capability of the currently selected service BCb Bearer Capability of the service to switch to BCmm Bearer Capability multimedia BCSM Basic Call State
41、 Model BCsp Bearer Capability speech CAMEL Customised Applications for Mobile network Enhanced Logic DP Detection PointIE Information Element MMI Man-Machine InterfaceO-MSC Originating MSC OoBTC Out-of-Band Transcoder Control O-UE Originating UE RI Repeat Indicator SCUDIF Service Change and UDI/RDI
42、Fallback T-MSC Terminating MSC T-UE Terminating UE 4 Service change and fallback for UDI/RDI multimedia 4.1 General Requirements The Service Change and UDI Fallback (SCUDIF) is a function which applies to UDI/RDI multimedia calls (see 3GPP TS 22.101 8, clause 7.2.1), and shall support the following:
43、 a) Fallback to speech during call setup: allow a user to attempt to set up a multimedia call, and try a speech connection if the former doesnt succeed; b) Fallback to the less preferred service (speech or multimedia) during call setup: allow the terminating side via specific settings for this servi
44、ce in the terminal to accept or reject a multimedia call, without interrupting the call setup; c) Fallback to the preferred service (speech or multimedia) or speech during call setup: allow the call setup to proceed with a single service if the transit network does not support the signalling of this
45、 functionality; d) BC negotiation at the terminating side: allow the terminating side via specific settings for this service in the terminal to turn a speech call (with service change) into a multimedia call and vice-versa; ETSI ETSI TS 123 172 V15.0.0 (2018-07)83GPP TS 23.172 version 15.0.0 Release
46、 15e) Service change: allow a speech call to be turned to multimedia by either of parties, and back to speech, through a successful in call modification procedure; f) Allow any of the users to reject a multimedia request from the other party while in speech mode. g) Network-initiated service change:
47、 The network shall initiate a sevice-change from multimedia to speech during the active call if a multimedia call can no longer be supported. If a multimedia call can again be supported at a later point in time, the network may initiate a service change from speech to multimedia. To fulfil: - servic
48、e request signalling between the UE and the MSC; - service request signalling across the Core Network. This functionality is not supported for multimedia with Fixed Network User Rate set to 32 kbit/s. In this case, the MSC shall revert to a multimedia only call. 4.2 Access Call Control Signalling Us
49、ing the repeat indicator value “support of service change and fallback“, as described in 3GPP TS 24.008 3, clause 5.3.6, together with two BC-IEs, a multimedia and a speech, it is possible to request a service change and fallback functionality, while still maintaining the backwards compatibility with non-supporting terminals. 4.2.1 Mobile originating side - initiation of call setup By sending a SETUP message with a Repeat Indicator set to “support of service change and fallback“, a multimedia BC-IE, and a speech BC-IE (see f
