1、 ETSI TR 122 903 V15.0.0 (2018-07) Digital cellular telecommunications system (Phase 2+) (GSM); Universal Mobile Telecommunications System (UMTS); LTE; Study on Videotelephony teleservice (3GPP TR 22.903 version 15.0.0 Release 15) TECHNICAL REPORT ETSI ETSI TR 122 903 V15.0.0 (2018-07)13GPP TR 22.90
2、3 version 15.0.0 Release 15Reference RTR/TSGS-0122903vf00 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-Prfecture de Grasse
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9、 V15.0.0 (2018-07)23GPP TR 22.903 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 ETSI membe
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14、nt 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 be found under http
15、:/webapp.etsi.org/key/queryform.asp. Modal verbs terminology In the present document “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 the expression of provisions). “must“ a
16、nd “must not“ are NOT allowed in ETSI deliverables except when used in direct citation. ETSI ETSI TR 122 903 V15.0.0 (2018-07)33GPP TR 22.903 version 15.0.0 Release 15Contents Intellectual Property Rights 2g3Foreword . 2g3Modal verbs terminology 2g3Foreword . 4g31 Scope 5g32 References 5g33 Definiti
17、ons, symbols and abbreviations . 5g33.1 Definitions 5g33.2 Abbreviations . 5g34 Overview of CS videotelephony support in 3GPP specifications up to Release 6 . 6g34.1 Codec 6g34.2 Charging . 6g34.3 Supplementary services 6g35 Requirements for videotelephony service 7g35.1 Charging . 7g35.2 Codec nego
18、tiation . 7g35.3 Security 8g35.4 Privacy 8g35.5 Supplementary service support . 8g35.6 Fall back to speech and in-call modification 9g35.7 Subscription 9g35.8 Handover 9g35.9 Emergency calls support 9g35.10 Notifications to the User . 9g36 Backwards compatibility requirements 9g36.1 General descript
19、ion of functionalities that are supported in a videotelephony call to a pre Rel-7 videotelephony . 11g36.2 Interoperability with fixed videotelephony service 11g37 International calls and roaming 12g38 Conclusions 12g3Annex A: Existing requirements for videotelephony 13g3Annex B: Change history 14g3
20、History 15g3ETSI ETSI TR 122 903 V15.0.0 (2018-07)43GPP TR 22.903 version 15.0.0 Release 15Foreword This Technical Report 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 for
21、mal 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
22、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 editorial only changes have been incorporated in the document. ET
23、SI ETSI TR 122 903 V15.0.0 (2018-07)53GPP TR 22.903 version 15.0.0 Release 151 Scope The present document intends to analyse the introduction of additional functionalities for the videotelephony service in addition to what is provided in the 3GPP specifications up to Release 6. The functionalities w
24、ill include but are not limited to codec negotiation, charging principles, supplementary services support. The approach followed is to evaluate how functionalities which are applicable to existing teleservices can be replicated for videotelephony. The document will analyse how the new functionalitie
25、s will impact the backwards compatibility with the existing CS multimedia service and will whether it is beneficial to create a videotelephony teleservice. 2 References The following documents contain provisions which, through reference in this text, constitute provisions of the present document. Re
26、ferences 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 (including a GS
27、M 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 3GPP TS 22.004: “General on Supplementary Services“. 3 3GPP TS 22 101: “Service Principles“. 4 3GPP TS
28、 26.110: “Codec for circuit switched multimedia telephony service“. 5 3GPP TS 26.111: “Modification to H.324“. 6 3GPP TS 21.133: “3G security; Security threats and requirements“. 3 Definitions, symbols and abbreviations 3.1 Definitions For the purposes of the present document, the following terms an
29、d definitions apply. Teleservice: Is a type of telecommunication service that provides the complete capability, including terminal equipment functions, for communication between users according to standardised protocols and transmission capabilities established by agreement between operators. Videot
30、elephony: a instance of bidirectional multimedia communications between two parties where a speech component and a video component are transmitted and received. 3.2 Abbreviations For the purposes of the present document, the following abbreviations apply: VT Video Telephony UE User EquipmentFurther
31、abbreviations are given in 3GPP TR 21.905 1. ETSI ETSI TR 122 903 V15.0.0 (2018-07)63GPP TR 22.903 version 15.0.0 Release 154 Overview of CS videotelephony support in 3GPP specifications up to Release 6 The CS Multimedia telephony is a Bearer Service, which is using the basic bearer service BS30 in
32、the Core Network. On the air interface the BS30 is mapped to the Radio Access Bearer (RAB) using the traffic class “Conversational” with 64kbps CS in UL and DL direction. 4.1 Codec ITU-T has specified that Recommendation H.324 should be used for video telephony in circuit switched connection. The 3G
33、PP-variant of H.324 is named 3G-324M and the corresponding 3GPP specification is the 4 TS 26.110 “ Codec for circuit switched multimedia telephony service“ and 5 TS 26.111 “ Modification to H.324“. 3G-324M terminals provide real-time video, audio, or data, in any combination over 3GPP circuit-switch
34、ed radio networks. 4.2 Charging The RAB and the corresponding BS30 is not only for video telephony, data transfer is also possible. The user is able to select via terminal, depending on terminal capabilities, which service they prefer, but the CN may not be able to distinguish between video telephon
35、y and data transfer unless the UE provides such indication. This also applies to changes during call set-up and in-call modification of the requested service. That means the current charging architecture may not be able to support e.g. two different pricing models for video telephony and data transf
36、er. 4.3 Supplementary services The BS30 is a general synchronous bearer service with support of supplementary services. 2 TS 22.004 includes an overview of the supplementary services which are supported and which are not supported by the BS30 bearer as shown in the table below: ETSI ETSI TR 122 903
37、V15.0.0 (2018-07)73GPP TR 22.903 version 15.0.0 Release 15Supplementary Service Support by BS30 eMLPP enhanced Multi-Level Precedence and Pre-emption Yes CD Call Deflection Yes CLIP Calling Line Identification Presentation Yes CLIR Calling Line Identification Restriction Yes COLP Connected Line Iden
38、tification Presentation Yes COLR Connected Line Identification Restriction Yes CFU Call Forwarding Unconditional Yes CFB Call Forwarding on Mobile Subscriber Busy Yes CFNRy Call Forwarding on No Reply Yes CFNRc Call Forwarding on Mobile Subscriber Not Reachable Yes CW Call Waiting Yes HOLD Call Hold
39、 No MPTY Multi Party Service No CUG Closed User Group Yes AoCI Advice of Charge (Information) Yes AoCC Advice of Charge (Charging) Yes UUS User-to-user signalling Yes BAOC Barring of All Outgoing Calls Yes BOIC Barring of Outgoing International Calls Yes BOIC-exHC Barring of Outgoing International C
40、alls except those directed to the Home PLMN Country Yes BIC Barring of All Incoming Calls Yes BIC-Roam Barring of Incoming Calls when Roaming Outside the Home PLMN Country Yes ECT Explicit Call Transfer No CCBS Completion of calls to busy subscribers Yes SPNP Support of Private Numbering Plan Yes CN
41、AP Calling Name Presentation No MSP Multiple Subscriber Profiles Yes MC Multicall Yes 5 Requirements for videotelephony service 5.1 Charging It should be possible for the network to identify when a videotelephony is established so that accurate charging can be realised. All the events related to the
42、 videotelephony call such as modifications of the service type (e.g. speech call to videotelephony call modification, fall back to speech), modification of the codecs and so on should be recorded. 5.2 Codec negotiation It should be possible for terminals to perform codec negotiation during videotele
43、phony call set up. This should result in reduced call set up time for videotelephony calls and may allow new and more efficient video codecs to be introduced easily within mobile networks. This should be realised in the same fashion as speech call where the calling terminal presents to the recipient
44、 a list of supported codecs alongside the preferred one. ETSI ETSI TR 122 903 V15.0.0 (2018-07)83GPP TR 22.903 version 15.0.0 Release 155.3 Security The user shall be able to use and access the VT service in a secure manner. It shall be possible to deny access to the VT service to unauthorized users
45、. An authorization may be based on the identity of the originating and/or destination user/device. The “Security Threats and Requirements“ specified in 6 shall not be compromised. 5.4 Privacy It shall be possible to prevent exchange of users identity during call setup (e.g., by using CLIR/COLR). In
46、addition, to protect user privacy it shall be possible to: - enable/disable video camera during the call. - accept a video call in audio mode only. - enable/disable audio during the call (mute/unmute). A recipient shall be informed of the identity of the sender in case the sender has not restricted
47、his identity to be transmitted. Optional support for ciphering user audio/video/data sessions should be considered. Note: this may be in conflict with lawful intercept if the encrypting in this case is user to user and the network is not able to recover the keys. 5.5 Supplementary service support At
48、 least the following supplementary services should be supported for videotelephony, which are already available for BS30: - eMLPP (enhanced Multi-Level Precedence and Pre-emption) - CD (Call Delfection) - CLIP (Calling Line Identification Presentation) - CLIR (Calling Line Identification Restriction
49、) - COLP (Connected Line Identification Presentation) - COLR (Connected Line Identification Restriction) - all the call forwarding types (CFU, CFB, CFNRy, CFNRc) - - CW (Call Waiting) - CUG (Closed User Group) - AoCI (Advice of Charge Information) and AoCC (Advice of Charge Charging) - UUS (User-to-user signalling) - all types of barring (BAOC, BOIC, BOIC -exHC, BIC, BIC-Roam) - CCBS (Call Completion to Busy Subscriber) - SPNP (Support of Private Numbering Plan) - MSP (Multiple Subscriber Profiles) - MC (Multicall) Furthermore following supplemen
