ETSI TR 125 992 V14.0.0 (2017-04)

ETSI TR 125 992 V14.0.0 (2017-04)






TECHNICAL REPORT
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 14.0.0 Release 14)

R
GLOBAL SYSTEM FOR
MOBILE COMMUNICATIONS

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3GPP TR 25.992 version 14.0.0 Release 14 1 ETSI TR 125 992 V14.0.0 (2017-04)



Reference
RTR/TSGR-0025992ve00
Keywords
GSM,UMTS
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3GPP TR 25.992 version 14.0.0 Release 14 2 ETSI TR 125 992 V14.0.0 (2017-04)
Intellectual 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 available for ETSI members and non-members, and can be found
in ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in
respect of ETSI standards", which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web
server (https://ipr.etsi.org/).
Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee
can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web
server) which are, or may be, or may become, 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 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 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 when used in direct citation.

ETSI

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3GPP TR 25.992 version 14.0.0 Release 14 3 ETSI TR 125 992 V14.0.0 (2017-04)
Contents
Intellectual Property Rights . 2
Foreword . 2
Modal verbs terminology . 2
Foreword . 4
1 Scope . 5
2 References . 5
3 Definitions, symbols and abbreviations . 5
3.1 Definitions . 5
3.2 Symbols . 6
3.1 Abbreviations . 6
4 Background and introduction . 6
5 RAN MBMS requirements . 6
5.1 MBMS Notification Requirements . 7
6 RAN MBMS functions . 8
6.1 Functions list . 8
6.2 Function descriptions . 8
6.2.1 Admission control . 8
6.2.2 Identification of the number of UEs with activated MBMS service(s) in a cell . 8
6.2.3 Selection, assignment and establishment and release of radio bearers . 9
6.2.4 Identification of MBMS parameters to UEs . 9
6.2.5 Alerting UEs that MBMS data is to be transmitted . 9
6.2.6 Power control . 9
6.2.7 Support of cell dhange and minimization of data loss . 9
6.2.8 Maintenance of MBMS context . 9
6.2.9 Replication of MBMS data streams . 9
6.2.10 Transfer of MBMS data . 9
6.3 Functional separation . 9
Annex A: Change History . 10
History . 11

ETSI

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3GPP TR 25.992 version 14.0.0 Release 14 4 ETSI TR 125 992 V14.0.0 (2017-04)
Foreword
rd
This Technical Report (TR) has been produced by the 3 Generation 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-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 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 incremented when editorial only changes have been incorporated in the document.
ETSI

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3GPP TR 25.992 version 14.0.0 Release 14 5 ETSI TR 125 992 V14.0.0 (2017-04)
1 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 SA2 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 specifications 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 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-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 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 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 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 (Broadcast/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.
Multicast 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-point 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 Notificatio
...