1、 ETSI TR 125 992 V15.0.0 (2018-07) Digital cellular telecommunications system (Phase 2+) (GSM); Universal Mobile Telecommunications System (UMTS); Multimedia Broadcast/Multicast Service (MBMS); UTRAN/GERAN requirements (3GPP TR 25.992 version 15.0.0 Release 15) TECHNICAL REPORT GLOBAL SYSTEM FOR MOB
2、ILE COMMUNICATIONSRETSI ETSI TR 125 992 V15.0.0 (2018-07)13GPP TR 25.992 version 15.0.0 Release 15Reference RTR/TSGR-0025992vf00 Keywords GSM,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
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14、oduced 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 interpreted as being references to the corresponding ETSI deliverables. The cross reference
15、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 Draft
16、ing 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 125 992 V15.0.0 (2018-07)33GPP TR 25.992 version 15.0.0 Release 15Contents Intellectual Property Rights 2g3Foreword . 2g3Modal verbs
17、 terminology 2g3Foreword . 4g31 Scope 5g32 References 5g33 Definitions, symbols and abbreviations . 5g33.1 Definitions 5g33.2 Symbols 6g33.1 Abbreviations . 6g34 Background and introduction . 6g35 RAN MBMS requirements . 6g35.1 MBMS Notification Requirements . 7g36 RAN MBMS functions . 7g36.1 Functi
18、ons list 7g36.2 Function descriptions . 8g36.2.1 Admission control . 8g36.2.2 Identification of the number of UEs with activated MBMS service(s) in a cell . 8g36.2.3 Selection, assignment and establishment and release of radio bearers . 8g36.2.4 Identification of MBMS parameters to UEs . 8g36.2.5 Al
19、erting UEs that MBMS data is to be transmitted 8g36.2.6 Power control 9g36.2.7 Support of cell dhange and minimization of data loss 9g36.2.8 Maintenance of MBMS context 9g36.2.9 Replication of MBMS data streams 9g36.2.10 Transfer of MBMS data 9g36.3 Functional separation . 9g3Annex A: Change History
20、 . 10g3History 11g3ETSI ETSI TR 125 992 V15.0.0 (2018-07)43GPP TR 25.992 version 15.0.0 Release 15Foreword 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 follow
21、ing 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 first digit: 1 presented to TSG for information; 2 presented to T
22、SG 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 incremented when editorial only changes have been incorporated in the docum
23、ent. ETSI ETSI TR 125 992 V15.0.0 (2018-07)53GPP TR 25.992 version 15.0.0 Release 151 Scope This document is part of the RAN WI “Introduction of the Multimedia Broadcast Multicast Service (MBMS) in RAN” and it is linked to 3GPP TS 22.146 “Multimedia Broadcast Multicast Service; Stage-1“ 2 and the SA
24、2 WI “Multimedia Broadcast/Multicast Service Architecture“, the work of which is reflected in 3GPP TS 23.246 3. The purpose of the present document is to address the UTRAN and GERAN MBMS requirements in order to help the TSG RAN and TSG GERAN working groups address the changes needed to existing spe
25、cifications and also identify new specifications, that are required for the introduction of the WI “Introduction of the Multimedia Broadcast Multicast Service (MBMS) in RAN“. 2 References The following documents contain provisions which, through reference in this text, constitute provisions of the p
26、resent 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-specific reference, the latest version applies. In the case of a reference to a 3GPP
27、 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 Specifications “. 2 3GPP TS 22.146: “Multimedia Broadcast/Multicast Service; Stage-1“. 3 3GPP TS
28、 23.246: “Multimedia Broadcast Multicast Service; Architecture and Functional Description“. 3 Definitions, symbols and abbreviations 3.1 Definitions For the purposes of the present document, the following terms and definitions given in 1 and the following apply Broadcast mode: The part of MBMS that
29、supports broadcast services. Counting: This is the function that UTRAN performs when it wishes to identify the number of multicast subscribers (all joined subscribers, or just above a “threshold“) in a particular cell, that wish to receive a multicast session for a particular service. MBMS (Broadcas
30、t/Multicast) Session: A continuous and time-bounded reception of a broadcast/multicast service by the UE. A single broadcast/multicast service can only have one broadcast/multicast session at any time. A broadcast/multicast service may consist of multiple successive broadcast/multicast sessions. Mul
31、ticast mode: The part of MBMS that supports multicast services. MBMS broadcast activation: The process which enables the data reception from a specific broadcast mode MBMS on a UE. Thereby the user enables the reception locally on the UE. MBMS multicast activation (Joining):. The explicit point-to-p
32、oint UE to network signalling, which enables a UE to become a member of a multicast group and thus start receiving data from a specific MBMS multicast service (when data become available). MBMS Notification: The mechanism, which informs the UEs about the availability or coming availability of a spec
33、ific MBMS RAB data in one given cell. Service Announcements/Discovery: The mechanisms should allow users to request or be informed about the range of MBMS services available Operators/service providers may consider several service discovery mechanisms. This could ETSI ETSI TR 125 992 V15.0.0 (2018-0
34、7)63GPP TR 25.992 version 15.0.0 Release 15include standard mechanisms such as SMS, or depending on the capability of the terminal, applications that encourage user interrogation. Users who have not already subscribed to a MBMS service should also be able to discover MBMS services. NOTE: Some of the
35、 above definitions have been taken from TS 22.146 2. Tracking: This is a function that allows UTRAN to follow the mobility of multicast subscribers. Inherently it can be used as a means of counting multicast subscribers. UE: Unless otherwise stated, UE is used to refer to both the UE and the MS. 3.2
36、 Symbols (void) 3.1 Abbreviations For the purposes of the present document, the abbreviations given in 3GPP TS 21.905 1 and the following apply: MBMS Multimedia Broadcast Multicast Service p-t-p Point-to-point p-t-m Point-to-multipoint 4 Background and introduction Following TSG RAN/SA#15, it was co
37、ncluded that the service requirements 2 of MBMS are considered stable enough and the work on the architectural aspects have progressed to the extent that the work in the RAN groups could be initiated. 5 RAN MBMS requirements Following the clarifications provided during the 3GPP MBMS workshop on stag
38、e 1 2 and stage 2 3, the following RAN requirements have been identified and are currently agreed within RAN WG2: 1. MBMS data transfer shall be downlink only. 2. QoS attributes shall be the same for MBMS Multicast and Broadcast modes. 3. During MBMS data transmission it shall be possible to receive
39、 paging messages, which also should contain some additional information, such as CLI. 4. Simultaneous reception of MBMS and non-MBMS services shall depend upon UE capabilities. 5. Simultaneous reception of more than one MBMS services shall depend upon UE capabilities. 6. A notification procedure sha
40、ll be used to indicate the start of MBMS data transmission. This procedure shall contain MBMS RB information. The MBMS notification requirements are listed in subclause 5.1. 7. A mechanism to enable the Network to move MBMS subscribers between cells is required. 8. MBMS UE multicast activation (Join
41、ing) shall be transparent to UTRAN. 9. A mechanism is required that enables the non-transmission of MBMS multicast mode in a cell which does not contain any MBMS UEs joined to the multicast group. 10. Reception of MBMS shall not be guaranteed at RAN level. MBMS does not support individual retransmis
42、sions at the radio link layer, nor does it support retransmissions based on feedback from individual subscribers at the radio level. This does not preclude the periodic repetitions of the MBMS content based on operator or content provider scheduling or retransmissions based on feedback at the applic
43、ation level. 11. MBMS shall not prevent the capability for SRNS/SBSS relocation. ETSI ETSI TR 125 992 V15.0.0 (2018-07)73GPP TR 25.992 version 15.0.0 Release 1512. A mechanism to provide UTRAN the received QoS per UE is not required as part of MBMS. 13. UE controlled “service based” cell selection/r
44、eselection shall not be permitted. 14. Handover and SGSN relocation shall not be affected by an active MBMS session. 15. In the case of UTRAN only, guaranteed QoS linked to a certain initial downlink power setting is not required; however, the purpose and possibility of some reporting mechanism coul
45、d be identified to measure the delivered QoS. NOTE: The above requirement is not applicable in GERAN, as a p-t-m type connection will use a similar power control mechanism to a broadcast channel. 16 MBMS Multicast mode transmissions should use dedicated resources (p-t-p) or common resources (p-t-m).
46、 The selection of the connection type (p-t-p or p-t-m) is operator dependent, typically based on downlink radio resource environment such as radio resource efficiency. A “threshold“ related to the number of users may be utilised, resulting in the need for a mechanism to identify the number of subscr
47、ibers in a given “area“. 17 MBMS solutions to be adopted should minimise the impact on the RAN physical layer and maximise reuse of existing physical layer and other RAN functionality. 18 MBMS charging should be transparent to the RAN. 19 MBMS should allow for low UE power consumption. 20 Header com
48、pression should be used. 21 MBMS should not prevent support for SGSN in pool. 22 Data loss during cell change should be minimal. 5.1 MBMS Notification Requirements The following requirements for MBMS notification mechanism(s) have been identified and currently agreed: 1 MBMS notification shall be tr
49、ansmitted within the MBMS service area. NOTE: If MBMS notification is transmitted in all cells of a corresponding MBMS service area or only in those cells where MBMS subscribers are actually located, is FFS. 2 MBMS notification shall be sent so it could be received by all UEs with an activated MBMS service, regardless of their RRC state or the lack of an RRC connection. 3 MBMS notification should maximise the reuse of existing channels. 4 MBMS notification should allow terminals to minimise their power consumption, meaning that UEs with an activated
