1、 ETSI TR 122 903 V14.0.0 (2017-03) Digital cellular telecommunications system (Phase 2+) (GSM); Universal Mobile Telecommunications System (UMTS); LTE; Study on Videotelephony teleservice (3GPP TR 22.903 version 14.0.0 Release 14) TECHNICAL REPORT ETSI ETSI TR 122 903 V14.0.0 (2017-03)13GPP TR 22.90
2、3 version 14.0.0 Release 14Reference RTR/TSGS-0122903ve00 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、017-03)23GPP TR 22.903 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 and non-members, and can be
10、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.org/). Pursuant to the ETSI IPR
11、 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 present document. Foreword The
12、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 be found under
13、 http:/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). “mu
14、st“ and “must not“ are NOT allowed in ETSI deliverables except when used in direct citation. ETSI ETSI TR 122 903 V14.0.0 (2017-03)33GPP TR 22.903 version 14.0.0 Release 14Contents Intellectual Property Rights 2g3Foreword . 2g3Modal verbs terminology 2g3Foreword . 4g31 Scope 5g32 References 5g33 Def
15、initions, 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
16、 negotiation . 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 10g36.1 General de
17、scription of functionalities that are supported in a videotelephony call to a pre Rel-7 videotelephony . 12g36.2 Interoperability with fixed videotelephony service 12g37 International calls and roaming 12g38 Conclusions 12g3Annex A: Existing requirements for videotelephony 14g3Annex B: Change histor
18、y . 15g3History 16g3ETSI ETSI TR 122 903 V14.0.0 (2017-03)43GPP TR 22.903 version 14.0.0 Release 14Foreword This Technical Report (TR) has been produced by ETSI 3rd Generation Partnership Project (3GPP). The contents of the present document are subject to continuing work within the TSG and may chang
19、e 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: 1 presented to TSG for information; 2 presen
20、ted 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 editorial only changes have been incorporated in t
21、he document. ETSI ETSI TR 122 903 V14.0.0 (2017-03)53GPP TR 22.903 version 14.0.0 Release 141 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 fu
22、nctionalities will 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
23、 functionalities 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 prese
24、nt 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 reference to a 3GPP document
25、(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 3GPP TS 22.004: “General on Supplementary Services“. 3 3GPP TS 22 101: “Service Princip
26、les“. 4 3GPP TS 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 fol
27、lowing terms and 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 op
28、erators. Videotelephony: 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 Eq
29、uipmentFurther abbreviations are given in 3GPP TR 21.905 1. ETSI ETSI TR 122 903 V14.0.0 (2017-03)63GPP TR 22.903 version 14.0.0 Release 144 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 s
30、ervice BS30 in 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 con
31、nection. The 3GPP-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
32、 circuit-switched 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
33、 video telephony 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
34、and data transfer. 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 E
35、TSI TR 122 903 V14.0.0 (2017-03)73GPP TR 22.903 version 14.0.0 Release 14Supplementary 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 Conn
36、ected Line Identification 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
37、 HOLD Call Hold 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
38、International Calls 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 Number
39、ing Plan Yes CNAP 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
40、 related to the 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 d
41、uring videotelephony 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 ETSI ETSI TR 122 903 V14.0.0 (2017-03)83GPP TR 22.903 version 14.0.0 Release 14easily within mobile networks. This should be re
42、alised in the same fashion as speech call where the calling terminal presents to the recipient a list of supported codecs alongside the preferred one. 5.3 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 una
43、uthorized users. 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
44、CLIR/COLR). In 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
45、not restricted 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 ser
46、vice support At 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 Identificat
47、ion Restriction) - 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)
48、- 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) ETSI ETSI TR 122 903 V14.0.0 (2017-03)93GPP TR 22.903 version 14.0.0 Release 14-
49、MC (Multicall) Furthermore following supplementary services should be supported: - HOLD: - CNAP (calling name presentation) The support of multiparty is for further study. 5.6 Fall back to speech and in-call modification When the radio access network of the calling party or of the called party cannot support any longer the video media, or the interconnection between networks does not or no longer support videotelephony, the videotelephony call should be downgraded to a speech call. The transition from videotelephony to speech should be realised
