1、 ETSI TR 122 979 V14.0.0 (2017-03) Digital cellular telecommunications system (Phase 2+) (GSM); Universal Mobile Telecommunications System (UMTS); LTE; Feasibility study on combined Circuit Switched (CS) calls and IP Multimedia Subsystem (IMS) sessions (3GPP TR 22.979 version 14.0.0 Release 14) TECH
2、NICAL REPORT ETSI ETSI TR 122 979 V14.0.0 (2017-03)13GPP TR 22.979 version 14.0.0 Release 14Reference RTR/TSGS-0122979ve00 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 As
3、sociation but non lucratif 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 p
4、rint versions of the present document shall not be modified without the prior written authorization of ETSI. In case of any existing or perceived difference in contents between such versions and/or in print, the only prevailing document is the print of the Portable Document Format (PDF) version kept
5、 on a specific network drive within ETSI Secretariat. Users of the present document should be aware that the document may be subject to revision or change of status. Information on the current status of this and other ETSI documents is available at https:/portal.etsi.org/TB/ETSIDeliverableStatus.asp
6、x If you find errors in the present document, please send your comment to one of the following services: https:/portal.etsi.org/People/CommiteeSupportStaff.aspx Copyright Notification No part may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying
7、and microfilm except as authorized by written permission of ETSI. The content of the PDF version shall not be modified without the written authorization of ETSI. The copyright and the foregoing restriction extend to reproduction in all media. European Telecommunications Standards Institute 2017. All
8、 rights reserved. DECTTM, PLUGTESTSTM, UMTSTMand the ETSI logo are Trade Marks of ETSI registered for the benefit of its Members. 3GPPTM and LTE are Trade Marks of ETSI registered for the benefit of its Members and of the 3GPP Organizational Partners. GSM and the GSM logo are Trade Marks registered
9、and owned by the GSM Association. ETSI ETSI TR 122 979 V14.0.0 (2017-03)23GPP TR 22.979 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
10、 publicly available for 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
11、 ETSI Web server (https:/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
12、, or may become, essential to the present document. Foreword 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 referen
13、ce 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 “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 Dr
14、afting 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 TR 122 979 V14.0.0 (2017-03)33GPP TR 22.979 version 14.0.0 Release 14Contents Intellectual Property Rights 2g3Foreword . 2g3Modal ve
15、rbs terminology 2g3Foreword . 4g31 Scope 5g32 References 5g33 Definitions, symbols and abbreviations . 5g33.1 Definitions 5g33.3 Abbreviations . 5g34 Introduction to Combinational Service 5g35 User experience of combinational services 6g36 Service Capability Detection 6g37 Impacts on IP Multimedia a
16、nd Supplementary Services 7g37.1 Supplementary services during a combinational call . 7g37.2 Service behaviour during a Combinational Session . 7g37.3 Support of teleservices during a combinational call . 8g38 Charging aspects for Combinational Service . 8g39 Suggested high-level Requirements . 8g31
17、0 Conclusions and recommendations 9g3Annex A: Use cases . 10g3A.1 Enriching Communications 10g3A.1.1 Enriched call session with multimedia 10g3A.1.2 Voice enhanced chatting . 11g3Annex B: Change history 12g3History 13g3ETSI ETSI TR 122 979 V14.0.0 (2017-03)43GPP TR 22.979 version 14.0.0 Release 14Fo
18、reword 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 change following formal TSG approval. Should the TSG modify the contents of the present document, it will
19、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 approval; 3 or greater indicates TSG approved document under change control. y the sec
20、ond 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 ETSI TR 122 979 V14.0.0 (2017-03)53GPP TR 22.979 version 14.0.0 Release 141 Scope T
21、his document studies the service requirements associated with a multimedia service combining a CS call with one or more IMS services (or vice versa), while appearing as a single service to both end-users. The feasibility study addresses the high-level requirements and use cases such for combinationa
22、l service including charging and user experience. 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 publication, edition number, version number, etc.) or
23、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 to the latest version of that document in the same
24、 Release as the present document. 1 3GPP TS 22.115: “Service aspects; Charging and billing“. 3 Definitions, symbols and abbreviations 3.1 Definitions For the purposes of the present document, the following terms and definitions apply: Combinational Service: A combinational service is created by addi
25、ng one or more IP multimedia component(s) to a CS call (or vice versa). The CS and IMS components are established between the same participants. Combinational call: this is the name given to the service in which a circuit switched speech teleservice is enriched by adding an IMS session where both se
26、rvices (session and CS call) are originated in one single UE and are terminated in another single UE. Combinational Session: this is the name given to the service in which an ongoing IMS session between two users is enriched by adding a circuit switched based call. The individual service instances t
27、hat form the combinational session are originated in a single UE and terminated in another single UE. CSICS capable UE: UE that supports Combinational Service. 3.3 Abbreviations For the purposes of the present document, the following abbreviations apply: CSICS Circuit Switched IMS Combinational Serv
28、ice 4 Introduction to Combinational Service - Combinational services are applicable to both UTRAN and GERAN. - The service shall enable the unidirectional exchange of PS data within the context of an IMS session - The service shall enable the bi-directional (simultaneous send receive) exchange of PS
29、 data within the context of a IMS session. ETSI ETSI TR 122 979 V14.0.0 (2017-03)63GPP TR 22.979 version 14.0.0 Release 14- The communication between user A and user B and the related charging shall continue even if a component drops A specific subscription for combinational services is not foreseen
30、 as being necessary. - The preconditions for a combinational service are - Users A and B have valid subscriptions for voice calls as well as for accessing the IMS - The service shall enable the communication: - between a user (A) using a UE with CSICS capability and a user (B) using a UE with CSICS
31、capability within the same PLMN and different PLMNs; - between users camping on different RATs - An IMS capable UE that also supports CS service should also be CSICS capable. - The service has to be available when roaming. - Interoperability between CSICS capable UE and IMS Core/Application server n
32、eeds to be guaranteed According to different UE implementations, it is expected that the following two service modes will exist in regards to IMS registration: 1) IMS pre established state: the CSICS capable UE performs the IMS registration at switch on. 2) IMS on demand state: the CSICS capable UE
33、performs the IMS registration: - to start the communication, or - to add a IMS component to an existing CS call. Interoperability between UEs that implement such different approaches shall be enabled. It shall be possible to successfully invite a user to join an IMS session whether the invited UE is
34、 IMS registered or not. The invited user shall be able to accept/refuse the IMS Registration request. 5 User experience of combinational services The existing address context is reused when the combined service is established. There is no need for the user to “redial”, which makes the combined servi
35、ce simple to invoke for the user. When one of the participating users terminates the CS call of a combinational service, the IMS session may continue. When one of the participating users terminates the IMS component of a combinational service, the CS call may continue. When the user A sends a multim
36、edia content to a user B, the user B can accept or reject the multimedia content (confirmation from the receiving party is needed) and vice versa. It shall be possible to initiate a combinational service with a CS call and to add an IMS/PS session later. It shall be possible to initiate a combinatio
37、nal service with an IMS/PS session and to add a CS call later 6 Service Capability Detection The Service Capability Detection may indicate to the user that the UEs have interoperable CSICS capability and that the network(s) the users are attached to have the necessary network functionality to carry
38、the combinational service. - Before or during the combined service establishment between user A and user B the recipient (user B) UE capabilities may need to be checked ETSI ETSI TR 122 979 V14.0.0 (2017-03)73GPP TR 22.979 version 14.0.0 Release 14- The detection of the capabilities of the recipient
39、 terminal shall ensure that information is updated in case of change of terminal - The (CSICS capable) UEs should have the information, prior to initiating a combinational service, regarding the type of capabilities, e.g. in terms of MMS classes, which are jointly supported by both UEs. - An operato
40、r should have the mechanism to inhibit the capability check, or at least indicate to UE that it should not be performed. 7 Impacts on IP Multimedia and Supplementary Services 7.1 Supplementary services during a combinational call The following supplementary services should be provided. The expected
41、behaviour of the IMS session forming the combinational call is also described: - Call hold: when the user decides to place the circuit switched call on hold, the user should be able to decide whether the IMS session of the combinational service should be suspended. If the IMS session has been suspen
42、ded it may be resumed once the circuit switched call is resumed. - Call waiting: the user should be able to receive an indication and provided with the option to switch between one call and the new incoming call. The IMS session should continue during the alerting of the subscriber and the user may
43、decide to put the IMS session on hold when switching to the new CS. - Call forwarding unconditional, on subscriber busy, on no reply, on not reachable: it should be possible to add IMS components to a CS call that has been forwarded, subject to the capability of such recipient. - BAIC, BOIC, BAOC, B
44、OIC-exHC, BIC-Roam: All the barring supplementary services should remain applicable. - Calling line identity presentation: Existing rules apply to both CS and IMS components independently. - Calling line identity restriction: Existing rules apply to both CS and IMS session independently, even if thi
45、s results in the called party being unable to establish a combinational service. - Connected line identity presentation: Existing rules apply to both CS and IMS components independently. - Connected line identity restriction: Existing rules apply to both CS and IMS session independently, even if thi
46、s results in the called party being unable to establish a combinational service. 7.2 Service behaviour during a Combinational Session There is no standardised supplementary service defined for IMS session, however mechanisms exist (service capabilities) to emulate the behaviour of some of the most c
47、ommon supplementary services that exist in the circuit switched domain. The intention in this section is NOT to define “supplementary services“ for IMS, just to explain the service behaviour during a combinational session for some specific cases as indicated below: - IMS session hold: the user may d
48、ecide to place the IMS session on hold, e.g. due to the wish of using the data capabilities of the UE for other purposes, or to initiate a different service. When this service is invoked the user should be able to decide whether the CS call of the combinational service should also be put on hold. -
49、IMS session waiting: The user should be able to receive an alert of an incoming IMS session (not part of the active combinational service) towards his UE. Subject to the capability of the UE, the user should be provided with the option to switch between the ongoing session and the new incoming one, or accept the new one in parallel with the existing one. The CS call of the combinational service should continue during the alerting of the subscriber and the user may decide to put the CS call on hold when switching to the new IMS session. - IMS session redirect: It shoul
