1、 ETSI TR 123 979 V14.0.0 (2017-05) Universal Mobile Telecommunications System (UMTS); LTE; 3GPP enablers for Open Mobile Alliance (OMA); Push-to-talk over Cellular (PoC) services; Stage 2 (3GPP TR 23.979 version 14.0.0 Release 14) TECHNICAL REPORT ETSI ETSI TR 123 979 V14.0.0 (2017-05)13GPP TR 23.97
2、9 version 14.0.0 Release 14Reference RTR/TSGS-0223979ve00 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
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9、the GSM Association. ETSI ETSI TR 123 979 V14.0.0 (2017-05)23GPP TR 23.979 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 publicly ava
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12、me, essential to the present document. Foreword This Technical Report (TR) has been produced by ETSI 3rd Generation Partnership Project (3GPP). The present document may refer to technical specifications or reports using their 3GPP identities, UMTS identities or GSM identities. These should be interp
13、reted 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 terminology In the present document “should“, “should not“, “may“, “need not“, “will“, “will not“,
14、 “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 when used in direct citation. ETSI ETSI TR 123 979 V14.0.0 (2017-05)33GPP TR 23.979 versi
15、on 14.0.0 Release 14Contents Intellectual Property Rights 2g3Foreword . 2g3Modal verbs terminology 2g3Foreword . 5g3Introduction 5g31 Scope 6g32 References 6g33 Definitions, symbols and abbreviations . 7g33.1 Definitions 7g33.2 Abbreviations . 7g34 Architectural Requirements 8g34.1 General Requireme
16、nts 8g34.2 PoC specific requirements relevant to 3GPP 8g35 Architectural Concept. 9g35.1 General overview . 9g35.2 Architecture assumptions . 10g35.2.1 Charging architecture aspects . 10g35.3 Signalling plane impacts 11g35.3.1 General aspects for PoC signalling . 11g35.3.2 On-demand Session 11g35.3.
17、2.1 On-demand session general . 11g35.3.2.2 On-demand session with automatic answer 11g35.3.2.3 On demand session with manual answer . 14g35.3.3 Pre-established Session. 17g35.3.3.1 Pre-established session general . 17g35.3.3.2 Pre-established session with automatic answer . 17g35.3.3.3 Pre-establis
18、hed session with manual answer . 19g35.4 User plane impacts . 22g35.4.1 General 22g35.4.2 GPRS interactions in relation to PoC 22g35.4.2.1 General 22g35.4.2.2 QoS traffic class considerations 22g35.4.3 PoC and SBLP/Go functions 23g35.5 Notification of Parallel Services . 23g35.5.1 Notification of in
19、coming CS service during a PoC session 23g35.5.2 Notification of PoC Session during an ongoing CS service. . 23g35.6 PoC Charging Correlation 23g36 Conclusions 24g3Annex A: Recommended QoS settings and configuration parameters for PoC . 25g3A.1 Introduction 25g3A.2 QoS attribute settings . 25g3A.2.1
20、 QoS attribute settings for general purpose PDP context . 25g3A.2.2 QoS attribute settings when separate PDP contexts are used for signalling and media . 26g3A.3 Radio Network Configuration 28g3Annex B: Delay analysis of PoC session establishment 29g3B.1 Introduction 29g3B.2 On demand session with m
21、anual answer 30g3ETSI ETSI TR 123 979 V14.0.0 (2017-05)43GPP TR 23.979 version 14.0.0 Release 14B.3 On demand session with automatic answer 32g3B.4 On pre-established session . 33g3Annex C: Required SigComp performance . 36g3C.1 Introduction 36g3C.2 Assumptions . 36g3C.3 Estimation of SIP compressio
22、n ratios 36g3C.4 SigComp requirements . 37g3Annex D: Change history 38g3History 39g3ETSI ETSI TR 123 979 V14.0.0 (2017-05)53GPP TR 23.979 version 14.0.0 Release 14Foreword This Technical Report has been produced by the 3rd Generation Partnership Project (3GPP). The contents of the present document a
23、re 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-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
24、 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 is incremented for all changes of substance, i.e. technical enhancements, corrections, updates, etc. z the third digit is increment
25、ed when editorial only changes have been incorporated in the document. Introduction Advanced interactive conferencing applications like Push to talk over Cellular (PoC) service enablers are being developed in OMA. It is expected that some enhancements of the 3GPP specifications will be needed in ord
26、er to use IMS Stage 2. 5 3GPP TS 23.141: “Presence Service; Stage 2“. 6 OMA-AD-PoC-V1.0: OMA PoC Specification, Architecture Document. 7 OMA-RD-PoC-V1_0: OMA PoC Specification, Requirements Document. 8 Void. 9 3GPP TS 23.207: “End-to-end Quality of Service (QoS) concept and architecture“. 10 3GPP TS
27、 23.107: “Quality of Service (QoS) concept and architecture“. 11 3GPP TS 26.071: “AMR speech Codec; General description“. 12 IETF RFC 3267: (June 2002): “Real-Time Transport Protocol (RTP) Payload Format and File Storage Format for the Adaptive Multi-Rate (AMR) and Adaptive Multi-Rate Wideband (AMR-
28、WB) Audio Codecs“. 13 3GPP TS 23.221: “Architectural requirements“. 14 IETF RFC 3320: (January 2003): “Signaling Compression (SigComp)“. 15 3GPP TS 24.228: “Signalling flows for the IP multimedia call control based on Session Initiation Protocol (SIP) and Session Description Protocol (SDP); Stage 3“
29、. 16 3GPP TS 24.229: “IP Multimedia Call Control Protocol based on Session Initiation Protocol (SIP) and Session Description Protocol (SDP); Stage 3“. 17 3GPP TS 32.240: “Telecommunication management; Charging management; Charging architecture and principles“. 18 3GPP TS 32.260: “Telecommunication m
30、anagement; Charging management; IP Multimedia Subsystem (IMS) charging“. 19 3GPP TS 32.299: “Telecommunication management; Charging management; Diameter charging applications“. ETSI ETSI TR 123 979 V14.0.0 (2017-05)73GPP TR 23.979 version 14.0.0 Release 1420 IETF RFC 2507: “IP Header Compression“. 2
31、1 IETF RFC 3095: “RObust Header Compression (ROHC): Framework and four profiles: RTP, UDP, ESP, and uncompressed“. 3 Definitions, symbols and abbreviations 3.1 Definitions For the purposes of the present document, the terms and definitions given in TS 21.905 2 and the following apply. PoC session: T
32、his is an established connection between PoC users where the users can communicate using voice one at a time. Right to Speak: In the PoC session establishment, the originating subscriber receives within a pre-determined time, an indication before he can speak, this is known as “Right to Speak (RtS)“
33、. 3.2 Abbreviations For the purposes of the present document, the following abbreviations apply: AMR Adaptive Multi-Rate AS Application ServerBER Bit Error Rate CCF Charging Collection Function CN Core Network CS Circuit SwitchedCSCF Call Session Control Function DL DownLinkDTM Dual Transfer Mode EC
34、F Event Charging Function FBC Flow Based Charging GERAN GSM EDGE Radio Access Network GGSN Gateway GPRS Support Node GPRS General Packet Radio Service I-CSCF Interrogating-CSCF IE Information ElementIM IP MultimediaIMS IP Multimedia Subsystem IP Internet Protocol ISC IP multimedia Service Control NA
35、S Non-Access Stratum OCS Online Charging System OMA Open Mobile Alliance P-CSCF Proxy-CSCF PCO Protocol Configuration Options PDP Packet Data Protocol PoC Push to talk over Cellular PS Packet Switched PSI Public Service Identity QoS Quality of Service RAB Radio Access Bearer RB Radio Bearer RD Requi
36、rements Document RL Radio Link RLC Radio Link Control RRC Radio Resource Control RTP Real-Time Transport Protocol RtS right-to-speak indication ETSI ETSI TR 123 979 V14.0.0 (2017-05)83GPP TR 23.979 version 14.0.0 Release 14S-CSCF Serving-CSCF SBLP Service Based Local Policy SDP Session Description P
37、rotocol SDU Session Data Unit SGSN Serving GPRS Support Node SIP Session Initiation Protocol SMS State Memory Size TBF Temporary Block Flow TCP Transport Control Protocol UDP User Datagram Protocol UE User Equipment UMTS Universal Mobile Telecommunications System UTRAN UMTS Terrestrial Radio Access
38、Network XDMS XML Document Management Server 4 Architectural Requirements 4.1 General Requirements The 3GPP system shall provide the capabilities to support the PoC service architecture as specified in OMA. It is assumed that the PoC architecture makes use of the following IMS capabilities in the 3GP
39、P system, which are described in TS 23.228 4 and TS 23.141 5: - Registration; - IMS routing capabilities, including discovery and address resolution; - IMS security including authentication and authorization; - IMS charging; - SIP compression; - IMS group management; - Public service identities; - P
40、resence Service. Commonality and differences with IMS conferencing require further study. 4.2 PoC specific requirements relevant to 3GPP In order for 3GPP system to support services like PoC, certain PoC requirements will require additional analysis within 3GPP in order to determine that all necessa
41、ry architectural support is in place via capabilities provided by the GERAN/UTRAN, GPRS and IMS. This clause captures the possible relevant requirements for the purposes of additional evaluation to ensure proper support is in place within 3GPP infrastructure: - The PoC service entity may provide the
42、 originating user with an early indication to start to speak even before invited users accept the call. - If the above condition is applied then the initiating PoC subscriber shall receive an indication if no participants receive the talk burst. - The originating subscriber receives right-to-speak (
43、RtS) indication after certain time depending on the answer mode setting of the target PoC subscriber. ETSI ETSI TR 123 979 V14.0.0 (2017-05)93GPP TR 23.979 version 14.0.0 Release 14- Depending on the setting by the PoC subscriber, the right-to-speak indication can be given to the originating PoC sub
44、scriber before the target PoC subscriber is reached or at least one of the target PoC subscribers has to accept the PoC session before the right-to-speak indication is given to the originating PoC subscriber. - During the PoC session, the PoC service entity provides right-to-speak indication to a Po
45、C subscriber requesting to speak. - In case of a chat group session, the communication between chat group participants shall be possible at the time the PoC chat group session is established, that is at least one participant has joined the chat session. - The timing requirements for capabilities suc
46、h as RtS shall be taken into account within 3GPP as specified in OMA PoC RD 7. - Charging architecture requirements shall be taken into account as specified in OMA PoC AD 6. - The user equipment, depending on its capabilities, shall support notification of incoming CS call during an ongoing PoC sess
47、ion as well as a notification of an incoming PoC session set up during an ongoing CS call. 5 Architectural Concept 5.1 General overview PoC service is introduced as an application within the frame of the IP Multimedia Subsystem (IMS). Figure 5.1 below illustrates how the PoC service elements fit int
48、o the IMS architecture. UE ISC IMS core PoC Server P-CSCF XDMS Mw Gm Ut S-CSCF PresenceServer Figure 5-1: PoC service elements in the IMS architecture NOTE: The I-CSCF is not shown in figure 5-1 for the sake of simplicity. Application servers (XDMS, PoC Server, Presence Server), and interfaces betwe
49、en these application servers shown within the dotted box in figure 5-1 are defined by OMA. The OMA PoC architecture specification 6 leverages IMS as the underlying SIP-based IP-core network. To understand the details of how IMS capabilities relate to the overall PoC architecture, there is a need to map the reference points defined in the OMA PoC specification 6, and the reference points defined in TS 23.002 3 and TS 23.228 4. The PoC server implementing the application level network functionality for the PoC service
