1、 ETSI TR 124 980 V15.0.0 (2018-06) LTE; Minimum requirements for support of MCPTT service over the Gm reference point (3GPP TR 24.980 version 15.0.0 Release 15) TECHNICAL REPORT ETSI ETSI TR 124 980 V15.0.0 (2018-06)13GPP TR 24.980 version 15.0.0 Release 15Reference RTR/TSGC-0124980vf00 Keywords LTE
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9、y 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 members and non-members, and can be found in ETSI SR 000 314: “Intellectual Property
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13、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 reports using their 3GPP i
14、dentities, 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 terminology In the present doc
15、ument “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 when used in direct c
16、itation. ETSI ETSI TR 124 980 V15.0.0 (2018-06)33GPP TR 24.980 version 15.0.0 Release 15Contents Intellectual Property Rights 2g3Foreword . 2g3Modal verbs terminology 2g3Foreword . 5g3Introduction 5g31 Scope 6g32 References 6g33 Definitions, symbols and abbreviations . 7g33.1 Definitions 7g33.2 Abbr
17、eviations . 7g34 Support of generic functions over the Gm reference point 7g34.1 General . 7g34.1.1 MCPTT UE . 7g34.1.2 SIP core. 7g34.1.3 EPC. 8g34.2 Registration procedures 8g34.2.1 MCPTT UE . 8g34.2.2 SIP core . 8g34.3 Authentication procedures 8g34.3.1 MCPTT UE. 8g34.3.2 SIP core . 8g34.4 Sessio
18、n establishment procedures 8g34.4.1 General 8g34.5 Integration of resource management and SIP . 8g34.5.1 MCPTT UE . 8g34.5.1.1 Loss of PDN connectivity . 8g34.5.1.2 Loss of media bearer and Radio Connection . 8g34.5.2 SIP core. 9g34.5.2.1 Loss of PDN connectivity . 9g34.5.2.2 Loss of media bearer an
19、d Radio Connection . 9g35 RTP and SDP considerations to support MCPTT over the Gm reference point 9g35.1 General . 9g35.1.1 MCPTT UE . 9g35.1.2 SIP core. 9g35.2 Data transport . 9g35.2.1 MCPTT UE . 9g35.2.2 SIP core. 9g35.3 RTCP usage 10g35.3.1 General 10g36 Bearer management 10g36.1 General . 10g36
20、.1.1 MCPTT UE . 10g36.2 EPS bearer considerations for SIP signalling and MCPTT sessions 10g36.2.1 MCPTT UE . 10g36.2.2 EPS . 10g36.2.3 SIP core . 10g36.3 P-CSCF discovery 11g36.3.1 MCPTT UE . 11g36.3.2 SIP core. 11g36.3.3 EPC. 11g37 Common functionalities . 11g37.1 IP version 11g3ETSI ETSI TR 124 98
21、0 V15.0.0 (2018-06)43GPP TR 24.980 version 15.0.0 Release 157.1.1 MCPTT UE . 11g37.1.2 SIP core. 11g3Annex A: Change history 13g3History 14g3ETSI ETSI TR 124 980 V15.0.0 (2018-06)53GPP TR 24.980 version 15.0.0 Release 15Foreword This Technical Report has been produced by the 3rdGeneration Partnershi
22、p 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-released by the TSG with an identifying change of release date and an increase
23、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 is incremented for all changes of substance, i.e. technical enhancements, c
24、orrections, updates, etc. z the third digit is incremented when editorial only changes have been incorporated in the document. Introduction 3GPP TS 23.179 2 defines that the SIP-1 reference point between the MCPTT UE and the SIP core uses the 3GPP Gm reference point (with necessary enhancements to s
25、upport MCPTT requirements and profiled to meet the minimum requirements for support of MCPTT). 3GPP TS 24.229 4 and 3GPP TS 24.301 5 contain several options or alternatives for the MCPTT UE and network for support of procedures on the Gm reference point in order to obtain IMS services. In order to e
26、nsure interoperability it is necessary to define recommendations that if adhered to by both MCPTT UE and network will ensure that the MCPTT UE can obtain access to the MCPTT service. The present document makes recommendations for the P-CSCF and S-CSCF entities defined in 3GPP TS 23.228 6, however if
27、 the SIP core for MCPTT does not internally comply with the architecture of 3GPP TS 23.228 6 these recommendations apply generically to whatever SIP core entity provides the equivalent functionality to the P-CCSF and S-CSCF. The MCPTT UE and SIP core adhere to the procedures on the Gm reference poin
28、t defined in 3GPP TS 24.229 4, 3GPP TS 24.301 5 and 3GPP TS 24.379 3. The present document cross-references and aligns with GSMA PRD IR.92 12, which profiles Voice and SMS over LTE (VoLTE). ETSI ETSI TR 124 980 V15.0.0 (2018-06)63GPP TR 24.980 version 15.0.0 Release 151 Scope The present document de
29、scribes a minimum IMS profile of the Gm reference point for SIP core implementation to guide interoperable implementation of MCPTT solutions. In order to support procedures over the SIP-1 reference point defined in 3GPP TS 23.179 2 and 3GPP TS 24.379 3, and which exists between the MCPTT UE Signalin
30、g User Agent and the SIP core for obtaining access to MCPTT service and supporting MCPTT sessions, the Gm reference point is profiled to meet the minimum requirements to support MCPTT. The Gm reference point contains many options which are not necessarily applicable for support of MCPTT or options w
31、hich are alternative mechanisms (e.g. P-CSCF discovery) where if the same option is not supported by both the MCPTT UE and the network interoperability cannot be achieved. The present document describes the following: - Where options exist in 3GPP TS 24.229 4 related to provision of IMS based servic
32、es over the Gm reference point, those options which need to be supported to ensure interoperable MCPTT service will be identified. - Where options exist in 3GPP TS 24.301 5 and stage 2 functionality that are needed to provide MCPTT service over IMS, those options which need to be supported to ensure
33、 interoperable MCPTT service will be identified. - Where optional features of MCPTT are defined that require additional options on the Gm reference point to be supported, these options will also be identified as recommended to be supported to ensure interoperability of the optional feature. The pres
34、ent document will only cover on-network unicast operation. The present document covers EPC aspects that are required by MCPTT to establish MCPTT sessions. 2 References The following documents contain provisions which, through reference in this text, constitute provisions of the present document. - R
35、eferences 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
36、 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 23.179: “Functional architecture and information flows to support mission critical commun
37、ication; Stage 2“. 3 3GPP TS 24.379: “Mission Critical Push To Talk (MCPTT) call control protocol specification“. 4 3GPP TS 24.229: “IP multimedia call control protocol based on Session Initiation Protocol (SIP) and Session Description Protocol (SDP); Stage 3“. 5 3GPP TS 24.301: “Non-Access-Stratum
38、(NAS) protocol for Evolved Packet System (EPS); Stage 3“. 6 3GPP TS 23.228: “IP Multimedia Subsystem (IMS); Stage 2“. 7 3GPP TS 33.203: “3G security; Access security for IP-based services“. 8 Void. 9 3GPP TS 23.203: “Policy and charging control architecture“. ETSI ETSI TR 124 980 V15.0.0 (2018-06)73
39、GPP TR 24.980 version 15.0.0 Release 1510 3GPP TS 36.331: “Evolved Universal Terrestrial Radio Access (E-UTRA); Radio Resource Control (RRC); Protocol specification“. 11 3GPP TS 26.179: “Mission Critical Push To Talk; Codecs and media handling“. 12 GSMA PRD IR.92 (V9.0): “IMS Profile for Voice and S
40、MS“ (http:/ 13 3GPP TS 24.383: “Mission Critical Push To Talk (MCPTT) Management Object (MO)“. 14 3GPP TS 29.214: “Policy and Charging Control over Rx reference point“. 3 Definitions, symbols and abbreviations 3.1 Definitions For the purposes of the present document, the terms and definitions given
41、in 3GPP TR 21.905 1 and the following apply. A term defined in the present document takes precedence over the definition of the same term, if any, in 3GPP TR 21.905 1. MCPTT service: A Push To Talk communication service supporting applications for Mission Critical Organizations and mission critical
42、applications for other businesses and organizations (e.g., utilities, railways) with fast setup times, high availability, reliability and priority handling. MCPTT related APN: An APN utilised by the MCPTT service including the MCPTT service APN for the SIP-1 reference point, an MC common core servic
43、es APN for the HTTP-1 reference point and a MC identity management service APN for the CSC-1 reference point. MCPTT UE: A UE that enables an MCPTT user to participate in MCPTT service. 3.2 Abbreviations For the purposes of the present document, the abbreviations given in 3GPP TR 21.905 1 and the fol
44、lowing apply. An abbreviation defined in the present document takes precedence over the definition of the same abbreviation, if any, in 3GPP TR 21.905 1. EPC Evolved Packet Core MC Mission Critical MCPTT Mission Critical Push To Talk over LTE PCC Policy and Charging Control P-CSCF Proxy Call Session
45、 Control Function UM Unacknowledged Mode 4 Support of generic functions over the Gm reference point 4.1 General 4.1.1 MCPTT UE All of the mandatory capabilities for an E-UTRAN capable UE and EPS defined in 3GPP TS 24.229 4 are assumed as a baseline to be supported by the MCPTT UE for this profile. A
46、ll of the mandatory capabilities for the UE defined in 3GPP TS 24.301 5 are assumed as a baseline to be supported by the MCPTT UE for this profile. 4.1.2 SIP core All the mandatory capabilities for the P-CSCF and S-CSCF for the messages sent and received on the Gm reference point defined in 3GPP TS
47、24.229 4 are assumed as a baseline to be supported for this profile. ETSI ETSI TR 124 980 V15.0.0 (2018-06)83GPP TR 24.980 version 15.0.0 Release 154.1.3 EPC All the mandatory capabilities for the MME defined in 3GPP TS 24.301 5 are assumed as a baseline to be supported for this profile. 4.2 Registr
48、ation procedures 4.2.1 MCPTT UE The MCPTT UE follows the SIP registration procedures defined in 3GPP TS 24.229 4. In addition, when the conditions for performing IMS registration in bullets 2, 3, 4, 5 and 6 in subclause L.3.1.2 of 3GPP TS 24.229 4 evaluate to true, the MCPTT UE registers with the IM
49、S. 4.2.2 SIP core The SIP core follows the SIP registration procedures defined in 3GPP TS 24.229 4. The SIP core supports network-initiated de-registration as defined in 3GPP TS 24.229 4. 4.3 Authentication procedures 4.3.1 MCPTT UE The MCPTT UE follows the procedures defined in 3GPP TS 24.229 4 and 3GPP TS 33.203 7 for authentication with IMS Authentication and Key Agreement (IMS-AKA), Sec-Agree and IPSec. The MCPTT UE supports integrity
