1、 ETSI TS 123 468 V15.0.0 (2018-07) LTE; Group Communication System Enablers for LTE (GCSE_LTE); Stage 2 (3GPP TS 23.468 version 15.0.0 Release 15) TECHNICAL SPECIFICATION ETSI ETSI TS 123 468 V15.0.0 (2018-07)13GPP TS 23.468 version 15.0.0 Release 15Reference RTS/TSGS-0223468vf00 Keywords LTE ETSI 6
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13、ute an endorsement by ETSI of products, services or organizations associated with those trademarks. Foreword This Technical Specification (TS) 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 “shall“, “shall not“, “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
16、 when used in direct citation. ETSI ETSI TS 123 468 V15.0.0 (2018-07)33GPP TS 23.468 version 15.0.0 Release 15Contents Intellectual Property Rights 2g3Foreword . 2g3Modal verbs terminology 2g3Foreword . 5g31 Scope 6g32 References 6g33 Definitions and abbreviations . 7g33.1 Definitions 7g33.2 Abbrevi
17、ations . 7g34 Architecture Model and Concepts 7g34.1 General Concept . 7g34.2 Architectural Reference Model 9g34.2.1 General 9g34.2.2 Non-roaming architecture . 9g34.2.3 Roaming architecture 10g34.2.4 Architecture model using a ProSe UE-to-Network Relay for Public Safety. 11g34.3 Reference points .
18、12g34.3.1 General 12g34.3.2 List of Reference Points 12g34.3.2.1 GC1 reference point 12g34.3.2.2 MB2 reference point . 12g34.3.2.3 SGmb/SGi-mb/M1/M3 reference points . 12g34.3.2.4 Rx reference point . 12g34.4 High level functions . 12g34.4.1 Unicast Delivery . 12g34.4.2 MBMS Delivery . 12g34.4.3 Ser
19、vice continuity . 13g34.5 Network Elements 13g34.5.1 GCS AS 13g34.5.2 UE . 13g34.5.3 PCRF 13g34.5.4 BM-SC 13g35 Functional Description and Information Flow . 14g35.1 MB2: Interface between GCS AS and BM-SC 14g35.1.1 General 14g35.1.2 MB2 Procedures . 14g35.1.2.1 General 14g35.1.2.2 TMGI Management .
20、 15g35.1.2.2.1 General 15g35.1.2.2.2 TMGI Allocation Procedure 15g35.1.2.2.3 TMGI Deallocation Procedure 15g35.1.2.2.4 TMGI allocation period expiry 16g35.1.2.3 Activating and Deactivating an MBMS bearer . 16g35.1.2.3.1 General 16g35.1.2.3.2 Activate MBMS Bearer Procedure 16g35.1.2.3.3 Deactivate MB
21、MS Bearer Procedure 18g35.1.2.4 Modify MBMS Bearer Procedure . 19g35.1.2.5 MBMS Delivery Status Indication Procedure . 20g35.2 Specific Usage of EPS Bearers for GCS 20g35.3 Service Continuity 21g35.3.1 General 21g35.3.2 Switching from Unicast Delivery to MBMS Delivery 21g35.3.3 Switching from MBMS D
22、elivery to Unicast Delivery . 22g35.3.3.1 General 22g3ETSI ETSI TS 123 468 V15.0.0 (2018-07)43GPP TS 23.468 version 15.0.0 Release 155.3.3.2 MBMS Delivery to Unicast Delivery (make-before-break) 22g35.3.3.3 MBMS Delivery to Unicast Delivery (break-before-make) 24g35.4 Priority and Pre-emption for Gr
23、oup Communication . 24g35.5 Charging . 27g35.6 Security 27g3Annex A (Informative): Utilisation of the Group Communication Service . 28g3A.1 General . 28g3A.2 Downlink Media path setup for MBMS Delivery 28g3A.2.1 General . 28g3A.2.2 Use of Pre-established MBMS bearers . 28g3A.2.3 Use of Dynamic MBMS
24、bearer establishment . 29g3Annex B (Informative): Change history . 30g3History 31g3ETSI ETSI TS 123 468 V15.0.0 (2018-07)53GPP TS 23.468 version 15.0.0 Release 15Foreword This Technical Specification has been produced by the 3rdGeneration Partnership Project (3GPP). The contents of the present docum
25、ent 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 in version number as follows: Version x.y.z where:
26、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, corrections, updates, etc. z the third digit is incr
27、emented when editorial only changes have been incorporated in the document. ETSI ETSI TS 123 468 V15.0.0 (2018-07)63GPP TS 23.468 version 15.0.0 Release 151 Scope The present document provides the stage 2 description for the 3GPP system provided enablers to support group communication services using
28、 EUTRAN access. The corresponding stage 1 requirements are defined in TS 22.468 2. The group communication system is represented by an Application Server (GCS AS) using the 3GPP system provided enablers for transferring its application signalling and for delivering application data, e.g. media data,
29、 to a group of UEs either (i) over MBMS Bearer Services using the Broadcast Mode of MBMS (TS 23.246 3); or (ii) over EPS Bearers; or (iii) over both MBMS and EPS bearer services. The specification covers both roaming and non-roaming scenarios and also includes support for service continuity, i.e. su
30、pport for continuous reception of application data when a UE changes between reception of application data via EPS and MBMS Bearer Services. Application level interactions between the UE and the GCS Application Server are out of scope of this specification. 2 References The following documents conta
31、in 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 non-specific. - For a specific reference, subsequent revisions do not apply. - For a non-s
32、pecific 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 Release as the present document. 1 3GPP TR 21.905: “Vocabulary for 3GPP Specification
33、s“. 2 3GPP TS 22.468: “Group Communication System Enablers for LTE (GCSE_LTE)“. 3 3GPP TS 23.246: “Multimedia Broadcast/Multicast Service (MBMS); Architecture and functional description“. 4 3GPP TS 29.214: “Policy and charging control over Rx reference point“. 5 3GPP TS 23.401: “General Packet Radio
34、 Service (GPRS) enhancements for Evolved Universal Terrestrial Radio Access Network (E-UTRAN) access“. 6 3GPP TS 23.203: “Policy and charging control architecture“. 7 3GPP TS 26.346: “ Multimedia Broadcast/Multicast Service (MBMS); Protocols and codecs“. 8 3GPP TS 33.246: “3G Security; Security of M
35、ultimedia Broadcast/Multicast Service (MBMS)“. 9 3GPP TS 36.300: “Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access (E-UTRAN); Overall description; Stage 2“. 10 3GPP TS 36.321: “Evolved Universal Terrestrial Radio Access (E-UTRA); Medium Access Contro
36、l (MAC) protocol specification“. 11 3GPP TS 23.303: “Proximity-based services (ProSe); Stage 2“. 12 3GPP TS 23.280: “Common functional architecture to support mission critical services; Stage 2“. ETSI ETSI TS 123 468 V15.0.0 (2018-07)73GPP TS 23.468 version 15.0.0 Release 153 Definitions and abbrevi
37、ations 3.1 Definitions For the purposes of the present document, the terms and definitions given in 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 TR 21.905 1. MBMS Delivery: A mechanism by which applicati
38、on data and signaling are delivered using MBMS bearer service over EUTRAN as defined in TS 23.246 3. Unicast Delivery: A mechanism by which application data and signaling are delivered using EPS bearer service over EUTRAN as defined in TS 23.401 5. ProSe UE-to-Network Relay: see TS 23.303 11. Remote
39、 UE: see TS 23.303 11. 3.2 Abbreviations For the purposes of the present document, the abbreviations given in TR 21.905 1 and the following apply. An abbreviation defined in the present document takes precedence over the definition of the same abbreviation, if any, in TR 21.905 1. AS Application Ser
40、ver ARP Allocation and Retention Priority BM-SC Broadcast Multicast - Service Centre DL Down Link DRX Discontinuous Reception FEC Forward Error Correction FQDN Fully Qualified Domain Name GCS Group Communication Service GCS AS Group Communication Service Application Server GCSE_LTE Group Communicati
41、on System Enabler for LTE MBMS Multimedia Broadcast/Multicast Service MBSFN Multimedia Broadcast multicast service Single Frequency Network MCH Multicast Channel MCCH Multicast Control Channel MTCH Multicast Traffic Channel PCC Policy and Charging Control PCEF Policy and Charging Enforcement Functio
42、n ProSe Proximity-based Services QCI QoS Class Identifier RoHC Robust Header Compression TMGI Temporary Mobile Group Identity UDP User Datagram Protocol vPCRF visited Policy and Charging Rules Function 4 Architecture Model and Concepts 4.1 General Concept This specification describes how a GCS Appli
43、cation Server (GCS AS) may use the enablers offered by the 3GPP system for providing a Group Communication Service (GCS). These enablers are denoted as Group Communication System Enablers (GCSE). The GCS AS uses EPS bearer services and may use in addition MBMS bearer services for transferring applic
44、ation signalling and data between the GCS AS and the UEs. In uplink direction, the UE uses an EPS bearer service to exchange application signalling with the GCS AS or when it wants to send data to the GCS AS. In downlink direction the GCS AS may transfer application signalling and data via the UE in
45、dividual EPS bearer services and/or via MBMS ETSI ETSI TS 123 468 V15.0.0 (2018-07)83GPP TS 23.468 version 15.0.0 Release 15bearer service. The GCS UEs register with their GCS AS using application signalling for participating in one or multiple GCS groups. NOTE 1: GCS application signalling (e.g. fo
46、r group admission and floor control) and GCS group management aspects (such as group creation, deletion, modification, group membership control, etc) are out of scope of this specification. When an MBMS bearer service is used, its broadcast service area may be pre-configured for use by the GCS AS. A
47、lternatively, the GCS AS may dynamically decide to use an MBMS bearer service when it determines that the number of UE for a GCS group is sufficiently large within an area (e.g. within a cell or a collection of cells). When MBMS bearer service is used, GCS AS may transfer data from different GCS gro
48、ups over a single MBMS broadcast bearer. The application signalling and data transferred via MBMS bearer(s) are transparent to BM-SC and the MBMS bearer service. The GCS AS provides the UEs via GCS application signalling with all configuration information that the UE needs to receive application dat
49、a via MBMS bearer services and to handle that data appropriately. When a GCS UE moves between areas where its MBMS broadcast bearers are available or not, the UE informs the GCS AS via application signalling that it changes from MBMS broadcast bearer reception to non-reception, or vice versa, the GCS AS activates or deactivates the downlink application signalling and data transfer via the UE individual EPS bearer(s) as appropriate. To accomplish service continuity, a UE may temporarily receive the same GCS application signalling and
