1、 ETSI TR 123 903 V15.0.0 (2018-06) Universal Mobile Telecommunications System (UMTS); LTE; Redial solution for voice-video switching (3GPP TR 23.903 version 15.0.0 Release 15) TECHNICAL REPORT ETSI ETSI TR 123 903 V15.0.0 (2018-06)13GPP TR 23.903 version 15.0.0 Release 15Reference RTR/TSGS-0223903vf
2、00 Keywords 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 (06) N 7803/88 Important notice The present document can b
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13、t document does not constitute an endorsement by ETSI of products, services or organizations associated with those trademarks. Foreword This Technical Report (TR) has been produced by ETSI 3rd Generation Partnership Project (3GPP). The present document may refer to technical specifications or report
14、s 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:/webapp.etsi.org/key/queryform.asp. Modal verbs terminolog
15、y 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“ and “must not“ are NOT allowed in ETSI deliverables except w
16、hen used in direct citation. ETSI ETSI TR 123 903 V15.0.0 (2018-06)33GPP TR 23.903 version 15.0.0 Release 15Contents Intellectual Property Rights 2g3Foreword . 2g3Modal verbs terminology 2g3Foreword . 4g3Introduction 4g31 Scope 5g32 References 5g33 Definitions, symbols and abbreviations . 5g33.1 Def
17、initions 5g34 Description of idle mode redial switching between voice and video . 6g34.1 General Description 6g34.2 User initiated switching during an established call 6g34.2.1 Signalling flows and procedures . 6g34.2.2 Future enhancements 8g34.2.2.1 Detection of video calling capability during a vo
18、ice call 8g34.3 Fallback to voice during an established video call . 9g34.3.1 Signalling flows and procedures . 9g34.3.1.1 Fallback from UTRAN Video to UTRAN Voice call . 9g34.3.1.2 Fallback from UTRAN Video to GERAN Voice call . 10g34.3.2 Future enhancements 11g34.3.2.1 RRC behaviour following degr
19、adation of the video RAB 11g34.3.2.2 Interaction with voice mail servers . 11g34.4 Fallback to voice during video call establishment 11g34.4.1 Signalling flows and procedures . 11g34.4.2 Future enhancements 13g34.4.2.1 How to detect that a voice call might be successful? 13g34.4.2.2 How to avoid vid
20、eo mail box problems? . 13g34.5 Automatic upgrade to video following fallback to voice . 13g35 Interaction with Supplementary Services and other 3GPP Features 14g35.1 General . 14g35.2 Calling Line Identity and Single Numbering Scheme 14g35.3 CAMEL based services triggered by call release and CCBS .
21、 14g35.4 Provision of Multi-Media “Ring Back“ tones to the A party 14g36 O+M, charging and inter-operator and roaming accounting 14g36.1 Call Detail Records and statistics . 14g36.2 Online charging 15g36.3 Tariffing . 15g36.4 Inter-operator accounting . 15g36.5 Roaming accounting . 15g3Annex A: List
22、 of CRs needed to other TSs 16g3A.1 General . 16g3A.2 CRs to other specifications already agreed by TSG Plenaries . 16g3A.3 Future CRs that are needed and/or are desirable 16g3Annex B: Change history 17g3History 18g3ETSI ETSI TR 123 903 V15.0.0 (2018-06)43GPP TR 23.903 version 15.0.0 Release 15Forew
23、ord 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 formal TSG approval. Should the TSG modify the contents of the present document, it will be re-rele
24、ased 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 second digit
25、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. Introduction Many 3GPP operators regard circuit switched video services as a key part of UMTS. How
26、ever there is a strong desire to have an effective and user friendly method of switching between voice and video services when the user desires and/or when radio conditions change and video mode is no longer available. Following a study of alternative mechanisms, this Technical Report describes the
27、idle mode redial mechanism which 3GPP based systems can use to enhance switching between voice and video services. ETSI ETSI TR 123 903 V15.0.0 (2018-06)53GPP TR 23.903 version 15.0.0 Release 151 Scope The present document describes the idle mode redial mechanism which 3GPP based systems can use to
28、enhance switching between circuit switched voice and video services. 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, vers
29、ion 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 GSM document), a non-specific reference implicitly refers to the latest version of
30、that document in the same Release as the present document. 1 3GPP TR 21.905: “Vocabulary for 3GPP Specifications“. 2 3GPP TS 44.018: “Mobile radio interface layer 3 specification, Radio Resource Control Protocol“. 3 3GPP TS 48.008: “Mobile-services Switching Centre Base Station System (MSC BSS) inte
31、rface; layer 3 specification“. 4 3GPP TS 25.331: “Radio Resource Control (RRC) protocol specification“. 5 3GPP TS 22.004: “General on supplementary services“. 6 3GPP TS 45.008: “Radio subsystem link control“. 7 3GPP TS 24.008: “Mobile radio interface Layer 3 specification; Core network protocols; St
32、age 3“. 8 3GPP TS 23.009: “Handover procedures“. 9 3GPP TS 32.205: “Telecommunication management; Charging management; Charging data description for the Circuit Switched (CS) domain“. 10 3GPP TS 22.082: “Call Forwarding (CF) supplementary services - Stage 1“. 11 3GPP TS 23.082: “Call Forwarding (CF)
33、 supplementary services - Stage 2“. 12 3GPP TS 23.205: “Bearer-independent CS Core Network“. 3 Definitions, symbols and abbreviations 3.1 Definitions For the purposes of the present document, the following terms and definitions given in TR 21.905 1 and the following apply. A party: the calling party
34、. B party: the called party. ETSI ETSI TR 123 903 V15.0.0 (2018-06)63GPP TR 23.903 version 15.0.0 Release 154 Description of idle mode redial switching between voice and video 4.1 General Description This “Idle-Mode Redial“ mechanism is a combination of existing Voice call and Video call standards a
35、nd services. It is a “terminal-centric“ solution that requires only minimal additional support from the UTRAN, GERAN and Core Network. There are 3 main components to the solution: a) Switching between voice and video during an established call is achieved by one UE releasing the voice (or video) cal
36、l and then that UE establishing a video (or voice) call with the same destination UE. b) During a video call, the radio coverage at one end may degrade such that the video call cannot be maintained. In this case the video call will be released, and, the UE that initiated the video call can offer to
37、its user an attempt to establish a voice call with the other party. c) The initial establishment of a video call may be unsuccessful, in which case the A party can automatically establish a voice call. For all these 3 cases, optimisation of the Man Machine Interface in the UE is possible and desirab
38、le. NOTE: There may be tradeoffs between speed of redial and interactions with content servers that only support video calls. In particular, the use of the term “automatic“ does not prevent the UE requesting confirmation from the user. It is not the intention of this TR to specify the MMI of UEs, ho
39、wever, this TR does describe some MMI actions solely for the purpose of easing the description of the procedures. 4.2 User initiated switching during an established call 4.2.1 Signalling flows and procedures The successful case of the “B party initiated switch to video“ for UMTS is illustrated in Fi
40、gure 1. The notation “UE 1“ and “UE 2“ is used (rather than A and B party) because, if the B party (of the voice call) presses the “switch to video“ button, it then becomes the A party of the subsequent video call. ETSI ETSI TR 123 903 V15.0.0 (2018-06)73GPP TR 23.903 version 15.0.0 Release 15UE 1 4
41、. Disconnect (cause) MSC 1 MSC 2 RNC 2 UE 2 RNC 1 UEs in Voice Call. UE 2 pushes the “change to video” button 5. Iu Rel Cmd 2. REL (cause) 5. Iu Rel Comp 5. Iu Rel Cmd 5. Iu Rel Comp 12. ACM 9. Call Proceeding 6. Voice and signaling connection released; idle mode procedures performed; Video call set
42、up by UE 2 3. REL COMP 9. IAM 12. Alerting 4. Release 4. Release Complete 1. Disconnect (cause) 1 Release 1. Release Complete UEs in Video Call 8. RAB Ass Req 8. RB Setup 8. RAB Ass Resp 11. Call Confirmed 10. Setup 11. RAB Ass Req 11. RAB Ass Resp 13. Connect 13. Connect Ack 13. ANM 13. Connect 13.
43、 Connect Ack 5. RRC release 5. RRC release 7. RRC setup 7. Initial DT 7. Initial UE msg 7. Setup 10. Paging 10. Paging 10. RRC setup 10. Initial DT 10. Initial UE msg 11. RB Setup 12. Alerting Figure 1: B party initiated switch to video 0) The UEs are in a voice call initiated by UE 1. Following ver
44、bal dialogue between User 1 and User 2, they agree that a switch to video is likely to be successful (e.g. because both User 1 and User 2 have video capable handsets, and, they both have “using 3G“ indications visible on their screens). The User of UE 2 pushes the “switch to video“ button (or uses o
45、ther MMI that provides the same functionality) and UE 2 stores the CLI of UE 1 for use in step 7. NOTE 1: If UE 1 (instead of UE 2) initiated the “switch to video“, then UE 1 stores the previously dialled number for use in step 7. 1) UE 2 releases the voice call. 2) MSC 2 sends a RELEASE message wit
46、h the release cause. The cause value in the RELEASE message might be changed by transit networks prior to arrival at MSC 1. 3) MSC 1 sends a RELEASE COMPLETE message to MSC 2. 4) MSC 1 releases the voice call with UE 1. 5) MSC 2 and MSC 1 locally release the Iu connections to RNC 2 and RNC 1 (assumi
47、ng that there are no other CM connections active). RNC 2 and RNC 1 then release the RRC connections (assuming that their mobiles are not in PMM connected state). ETSI ETSI TR 123 903 V15.0.0 (2018-06)83GPP TR 23.903 version 15.0.0 Release 15In order to minimise idle tasks performed by the UE, the fo
48、llowing should be performed by Operators which preferentially camp UEs on UMTS: the BSC should include the “Cell selection indicator after release of all TCH and SDCCH“ IE in the Channel Release message (see TS 44.018 2) if the release is done on a GERAN cell and the call was not started on this BSC
49、 and the local 2G and 3G cells are in different RAs. NOTE 2: The above text does mean RA. Change of LA always involves change of RA. 6) UE 2 and UE 1 camp on suitable cells and perform the required idle mode tasks. 7) UE 2 initiates RRC connection setup and sends the Setup message for the video call to MSC 2. The Called Party number is the one stored in step 0. The Setup message should carry extra information to indicate that it is the result of a redial attempt. 8) MSC 2 requests the allocation of radio resources. If the GERAN does not suppor
