|
TECHNICAL SPECIFICATION
5G;
NR;
Radio Resource Control (RRC);
Protocol specification
(3GPP TS 38.331 version 15.4.0 Release 15)
---------------------- Page: 1 ----------------------
3GPP TS 38.331 version 15.4.0 Release 15 1 ETSI TS 138 331 V15.4.0 (2019-04)
Reference
RTS/TSGR-0238331vf40
Keywords
5G
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 à but non lucratif enregistrée à la
Sous-Préfecture de Grasse (06) N° 7803/88
Important notice
The present document can be downloaded from:
The present document may be made available in electronic versions and/or in print. The content of any electronic and/or
print versions of the present document shall not be modified without the prior written authorization of ETSI. In case of any
existing or perceived difference in contents between such versions and/or in print, the prevailing version of an ETSI
deliverable is the one made publicly available in PDF format at www.etsi.org/deliver.
Users of the present document should be aware that the document may be subject to revision or change of status.
Information on the current status of this and other ETSI documents is available at
If you find errors in the present document, please send your comment to one of the following services:
Copyright Notification
No part may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying
and microfilm except as authorized by written permission of ETSI.
The content of the PDF version shall not be modified without the written authorization of ETSI.
The copyright and the foregoing restriction extend to reproduction in all media.
© ETSI 2019.
All rights reserved.
TM TM TM
DECT , PLUGTESTS , UMTS and the ETSI logo are trademarks of ETSI registered for the benefit of its Members.
TM TM
3GPP and LTE are trademarks of ETSI registered for the benefit of its Members and
of the 3GPP Organizational Partners.
oneM2M™ logo is a trademark of ETSI registered for the benefit of its Members and
of the oneM2M Partners.
GSM and the GSM logo are trademarks registered and owned by the GSM Association.
ETSI
---------------------- Page: 2 ----------------------
3GPP TS 38.331 version 15.4.0 Release 15 2 ETSI TS 138 331 V15.4.0 (2019-04)
Intellectual Property 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 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.
Trademarks
The present document may include trademarks and/or tradenames which are asserted and/or registered by their owners.
ETSI claims no ownership of these except for any which are indicated as being the property of ETSI, and conveys no
right to use or reproduce any trademark and/or tradename. Mention of those trademarks in the present document does
not constitute 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 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
.
Modal verbs terminology
In the present document "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 when used in direct citation.
ETSI
---------------------- Page: 3 ----------------------
3GPP TS 38.331 version 15.4.0 Release 15 3 ETSI TS 138 331 V15.4.0 (2019-04)
Contents
Intellectual Property Rights . 2
Foreword . 2
Modal verbs terminology . 2
Foreword . 14
1 Scope . 15
2 References . 15
3 Definitions, symbols and abbreviations . 16
3.1 Definitions . 16
3.2 Abbreviations . 17
4 General . 18
4.1 Introduction . 18
4.2 Architecture . 19
4.2.1 UE states and state transitions including inter RAT . 19
4.2.2 Signalling radio bearers . 21
4.3 Services . 22
4.3.1 Services provided to upper layers . 22
4.3.2 Services expected from lower layers . 22
4.4 Functions . 22
5 Procedures . 23
5.1 General . 23
5.1.1 Introduction. 23
5.1.2 General requirements . 23
5.1.3 Requirements for UE in EN-DC . 23
5.2 System information . 24
5.2.1 Introduction. 24
5.2.2 System information acquisition . 25
5.2.2.1 General UE requirements . 25
5.2.2.2 SIB validity and need to (re)-acquire SIB . 25
5.2.2.2.1 SIB validity . 25
5.2.2.2.2 SI change indication and PWS notification . 26
5.2.2.3 Acquisition of System Information . 26
5.2.2.3.1 Acquisition of MIB and SIB1 . 26
5.2.2.3.2 Acquisition of an SI message . 27
5.2.2.3.3 Request for on demand system information . 28
5.2.2.3.4 Actions related to transmission of RRCSystemInfoRequest message . 28
5.2.2.4 Actions upon receipt of System Information . 28
5.2.2.4.1 Actions upon reception of the MIB . 28
5.2.2.4.2 Actions upon reception of the SIB1 . 29
5.2.2.4.3 Actions upon reception of SIB2 . 30
5.2.2.4.4 Actions upon reception of SIB3 . 30
5.2.2.4.5 Actions upon reception of SIB4 . 31
5.2.2.4.6 Actions upon reception of SIB5 . 31
5.2.2.4.7 Actions upon reception of SIB6 . 31
5.2.2.4.8 Actions upon reception of SIB7 . 31
5.2.2.4.9 Actions upon reception of SIB8 . 32
5.2.2.4.10 Actions upon reception of SIB9 . 33
5.2.2.5 Essential system information missing . 33
5.3 Connection control . 33
5.3.1 Introduction. 33
5.3.1.1 RRC connection control . 33
5.3.1.2 Security . 34
5.3.2 Paging . 35
5.3.2.1 General . 35
5.3.2.2 Initiation . 35
ETSI
---------------------- Page: 4 ----------------------
3GPP TS 38.331 version 15.4.0 Release 15 4 ETSI TS 138 331 V15.4.0 (2019-04)
5.3.2.3 Reception of the Paging message by the UE . 35
5.3.3 RRC connection establishment . 36
5.3.3.1 General . 36
5.3.3.2 Initiation . 36
5.3.3.3 Actions related to transmission of RRCSetupRequest mes sa ge . 37
5.3.3.4 Reception of the RRCSetup by the UE . 37
5.3.3.5 Reception of the RRCReject by the UE . 38
5.3.3.6 Cell re-selection or cell selection while T390, T300 or T302 is running (UE in RRC_IDLE) . 38
5.3.3.7 T300 expiry . 39
5.3.3.8 Abortion of RRC connection establishment . 39
5.3.4 Initial security activation . 39
5.3.4.1 General . 39
5.3.4.2 Initiation . 40
5.3.4.3 Reception of the SecurityModeCommand by the UE . 40
5.3.5 RRC reconfiguration . 40
5.3.5.1 General . 40
5.3.5.2 Initiation . 41
5.3.5.3 Reception of an RRCReconfiguration by the UE . 41
5.3.5.4 Secondary cell group release . 43
5.3.5.5 Cell Group configuration . 43
5.3.5.5.1 General . 43
5.3.5.5.2 Reconfiguration with sync . 44
5.3.5.5.3 RLC bearer release . 45
5.3.5.5.4 RLC bearer addition/modification . 45
5.3.5.5.5 MAC entity configuration . 45
5.3.5.5.6 RLF Timers & Constants configuration . 46
5.3.5.5.7 SPCell Configuration . 46
5.3.5.5.8 SCell Release . 46
5.3.5.5.9 SCell Addition/Modification . 47
5.3.5.6 Radio Bearer configuration . 47
5.3.5.6.1 General . 47
5.3.5.6.2 SRB release . 47
5.3.5.6.3 SRB addition/modification . 48
5.3.5.6.4 DRB release . 49
5.3.5.6.5 DRB addition/modification . 49
5.3.5.7 Security key update . 51
5.3.5.8 Reconfiguration failure . 52
5.3.5.8.1 Void . 52
5.3.5.8.2 Inability to comply with RRCReconfiguration . 52
5.3.5.8.3 T304 expiry (Reconfiguration with sync Failure) . 53
5.3.5.9 Other configuration . 53
5.3.5.10 EN-DC release . 53
5.3.5.11 Full configuration . 54
5.3.6 Counter check . 55
5.3.6.1 General . 55
5.3.6.2 Initiation . 55
5.3.6.3 Reception of the CounterCheck message by the UE . 55
5.3.7 RRC connection re-establishment . 56
5.3.7.1 General . 56
5.3.7.2 Initiation . 56
5.3.7.3 Actions following cell selection while T311 is running . 57
5.3.7.4 Actions related to transmission of RRCReestablishmentRequest message . 57
5.3.7.5 Reception of the RRCReestablishment by the UE . 58
5.3.7.6 T311 expiry . 59
5.3.7.7 T301 expiry or selected cell no longer suitable . 59
5.3.7.8 Reception of the RRCSetup by the UE . 59
5.3.8 RRC connection release . 59
5.3.8.1 General . 59
5.3.8.2 Initiation . 60
5.3.8.3 Reception of the RRCRelease by the UE . 60
5.3.8.4 T320 expiry . 61
5.3.8.5 UE actions upon the expiry of DataInactivityTimer . 61
ETSI
---------------------- Page: 5 ----------------------
3GPP TS 38.331 version 15.4.0 Release 15 5 ETSI TS 138 331 V15.4.0 (2019-04)
5.3.9 RRC connection release requested by upper layers . 61
5.3.9.1 General . 61
5.3.9.2 Initiation . 62
5.3.10 Radio link failure related actions . 62
5.3.10.1 Detection of physical layer problems in RRC_CONNECTED . 62
5.3.10.2 Recovery of physical layer problems . 62
5.3.10.3 Detection of radio link failure . 62
5.3.11 UE actions upon going to RRC_IDLE . 63
5.3.12 UE actions upon PUCCH/SRS release request . 63
5.3.13 RRC connection resume . 64
5.3.13.1 General . 64
5.3.13.2 Initiation . 65
5.3.13.3 Actions related to transmission of RRCResumeRequest or RRCResumeRequest1 message . 66
5.3.13.4 Reception of the RRCResume by the UE . 67
5.3.13.5 T319 expiry or Integrity check failure from lower layers while T319 is running . 68
5.3.13.6 Cell re-selection or cell selection while T390, T319 or T302 is running (UE in
RRC_INACTIVE) . 68
5.3.13.7 Reception of the RRCSetup by the UE . 68
5.3.13.8 RNA update. 68
5.3.13.9 Reception of the RRCRelease by the UE . 69
5.3.13.10 Reception of the RRCReject by the UE . 69
5.3.13.11 Inability to comply with RRCResume . 69
5.3.13.12 Inter RAT cell reselection . 69
5.3.14 Unified Access Control . 69
5.3.14.1 General . 69
5.3.14.2 Initiation . 69
5.3.14.3 Void. 71
5.3.14.4 T302, T390 expiry or stop (Barring alleviation) . 71
5.3.14.5 Access barring check. 71
5.3.15 RRC connection reject . 72
5.3.15.1 Initiation . 72
5.3.15.2 Reception of the RRCReject by the UE . 72
5.4 Inter-RAT mobility. 73
5.4.1 Introduction. 73
5.4.2 Handover to NR . 73
5.4.2.1 General . 73
5.4.2.2 Initiation . 73
5.4.2.3 Reception of the RRCReconfiguration by the UE . 73
5.4.3 Mobility from NR . 73
5.4.3.1 General . 73
5.4.3.2 Initiation . 74
5.4.3.3 Reception of the MobilityFromNRCommand by the UE. 74
5.4.3.4 Successful completion of the mobility from NR . 74
5.4.3.5 Mobility from NR failure .
...