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ETSI TS 138 331 V16.3.1 (2021-01)TECHNICAL SPECIFICATION5G;NR;Radio Resource Control (RRC);Protocol specification(3GPP TS 38.331 version 16.3.1 Release 16)

3GPP TS 38.331 version 16.3.1 Release 161ETSI TS 138 331 V16.3.1 SI650 Route des LuciolesF-06921 Sophia Antipolis Cedex - FRANCETel.: 33 4 92 94 42 00 Fax: 33 4 93 65 47 16Siret N 348 623 562 00017 - NAF 742 CAssociation à but non lucratif enregistrée à laSous-Préfecture de Grasse (06) N 7803/88Important noticeThe present document can be downloaded from:http://www.etsi.org/standards-searchThe present document may be made available in electronic versions and/or in print. The content of any electronic and/orprint versions of the present document shall not be modified without the prior written authorization of ETSI. In case of anyexisting or perceived difference in contents between such versions and/or in print, the prevailing version of an ETSIdeliverable 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 .aspxIf you find errors in the present document, please send your comment to one of the following pportStaff.aspxCopyright NotificationNo part may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopyingand 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 2021.All rights reserved.DECT , PLUGTESTS , UMTS and the ETSI logo are trademarks of ETSI registered for the benefit of its Members.3GPP and LTE are trademarks of ETSI registered for the benefit of its Members andof the 3GPP Organizational Partners.oneM2M logo is a trademark of ETSI registered for the benefit of its Members andof the oneM2M Partners.GSM and the GSM logo are trademarks registered and owned by the GSM Association.ETSI

3GPP TS 38.331 version 16.3.1 Release 162ETSI TS 138 331 V16.3.1 (2021-01)Intellectual Property RightsEssential patentsIPRs essential or potentially essential to normative deliverables may have been declared to ETSI. The informationpertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be foundin ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI inrespect of ETSI standards", which is available from the ETSI Secretariat. Latest updates are available on the ETSI Webserver (https://ipr.etsi.org/).Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guaranteecan be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Webserver) which are, or may be, or may become, essential to the present document.TrademarksThe 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 noright to use or reproduce any trademark and/or tradename. Mention of those trademarks in the present document doesnot constitute an endorsement by ETSI of products, services or organizations associated with those trademarks.Legal NoticeThis 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. These shall beinterpreted as being references to the corresponding ETSI deliverables.The cross reference between 3GPP and ETSI identities can be found under http://webapp.etsi.org/key/queryform.asp.Modal verbs terminologyIn 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 ofprovisions)."must" and "must not" are NOT allowed in ETSI deliverables except when used in direct citation.ETSI

3GPP TS 38.331 version 16.3.1 Release 163ETSI TS 138 331 V16.3.1 (2021-01)ContentsIntellectual Property Rights .2Legal Notice .2Modal verbs terminology.2Foreword.201Scope .212References .213Definitions, symbols and abbreviations ions . 23Abbreviations . 25General .27Introduction . 27Architecture . 27UE states and state transitions including inter RAT . 27Signalling radio bearers . 29Services . 30Services provided to upper layers . 30Services expected from lower layers . 30Functions . 30Procedures .325.1General . 325.1.1Introduction. 325.1.2General requirements . 325.1.3Requirements for UE in MR-DC . 325.2System information . 335.2.1Introduction. 335.2.2System information acquisition . 345.2.2.1General UE requirements . 345.2.2.2SIB validity and need to (re)-acquire SIB . 345.2.2.2.1SIB validity. 345.2.2.2.2SI change indication and PWS notification . 355.2.2.3Acquisition of System Information . 365.2.2.3.1Acquisition of MIB and SIB1. 365.2.2.3.2Acquisition of an SI message . 375.2.2.3.3Request for on demand system information . 385.2.2.3.3aRequest for on demand positioning system information . 395.2.2.3.4Actions related to transmission of RRCSystemInfoRequest message . 405.2.2.3.5Acquisition of SIB(s) or posSIB(s) in RRC CONNECTED . 405.2.2.3.6Actions related to transmission of DedicatedSIBRequest message . 415.2.2.4Actions upon receipt of System Information . 415.2.2.4.1Actions upon reception of the MIB . 415.2.2.4.2Actions upon reception of the SIB1 . 425.2.2.4.3Actions upon reception of SIB2 . 455.2.2.4.4Actions upon reception of SIB3 . 465.2.2.4.5Actions upon reception of SIB4 . 465.2.2.4.6Actions upon reception of SIB5 . 475.2.2.4.7Actions upon reception of SIB6 . 475.2.2.4.8Actions upon reception of SIB7 . 475.2.2.4.9Actions upon reception of SIB8 . 485.2.2.4.10Actions upon reception of SIB9 . 495.2.2.4.11Actions upon reception of SIB10 . 495.2.2.4.12Actions upon reception of SIB11 . 495.2.2.4.13Actions upon reception of SIB12 . 495.2.2.4.14Actions upon reception of SIB13 . 50ETSI

3GPP TS 38.331 version 16.3.1 Release 164ETSI TS 138 331 V16.3.1 (2021-01)5.2.2.4.15Actions upon reception of SIB14 . 505.2.2.4.16Actions upon reception of SIBpos . 505.2.2.5Essential system information missing . 505.3Connection control . 505.3.1Introduction. 505.3.1.1RRC connection control . 505.3.1.2AS Security . 515.3.2Paging . 525.3.2.1General . 525.3.2.2Initiation . 525.3.2.3Reception of the Paging message by the UE . 535.3.3RRC connection establishment . 535.3.3.1General . 535.3.3.1aConditions for establishing RRC Connection for sidelink communication . 545.3.3.2Initiation . 545.3.3.3Actions related to transmission of RRCSetupRequest message. 555.3.3.4Reception of the RRCSetup by the UE . 555.3.3.5Reception of the RRCReject by the UE . 585.3.3.6Cell re-selection or cell selection while T390, T300 or T302 is running (UE in RRC IDLE) . 585.3.3.7T300 expiry . 585.3.3.8Abortion of RRC connection establishment . 595.3.4Initial AS security activation . 605.3.4.1General . 605.3.4.2Initiation . 605.3.4.3Reception of the SecurityModeCommand by the UE . 605.3.5RRC reconfiguration . 615.3.5.1General . 615.3.5.2Initiation . 625.3.5.3Reception of an RRCReconfiguration by the UE . 625.3.5.4Secondary cell group release . 695.3.5.5Cell Group configuration . 695.3.5.5.1General . 695.3.5.5.2Reconfiguration with sync . 705.3.5.5.3RLC bearer release . 725.3.5.5.4RLC bearer addition/modification . 725.3.5.5.5MAC entity configuration . 735.3.5.5.6RLF Timers & Constants configuration . 735.3.5.5.7SpCell Configuration . 745.3.5.5.8SCell Release . 745.3.5.5.9SCell Addition/Modification . 745.3.5.5.10BH RLC channel release . 755.3.5.5.11BH RLC channel addition/modification . 755.3.5.6Radio Bearer configuration . 765.3.5.6.1General . 765.3.5.6.2SRB release . 765.3.5.6.3SRB addition/modification . 765.3.5.6.4DRB release . 785.3.5.6.5DRB addition/modification . 785.3.5.7AS Security key update . 815.3.5.8Reconfiguration failure . 825.3.5.8.1Void . 825.3.5.8.2Inability to comply with RRCReconfiguration . 825.3.5.8.3T304 expiry (Reconfiguration with sync Failure) . 845.3.5.9Other configuration . 855.3.5.10MR-DC release . 875.3.5.11Full configuration . 885.3.5.12BAP configuration . 895.3.5.12aIAB Other Configuration . 895.3.5.12a.1IP address management . 895.3.5.12a.1.1IP Address Release . 895.3.5.12a.1.2IP Address Addition/Modification . 895.3.5.13Conditional Reconfiguration . 91ETSI

3GPP TS 38.331 version 16.3.1 Release 13.35.3.13.45.3.13.55.3.13.6ETSI TS 138 331 V16.3.1 (2021-01)General . 91Conditional reconfiguration removal . 91Conditional reconfiguration addition/modification . 91Conditional reconfiguration evaluation . 91Conditional reconfiguration execution . 92Sidelink dedicated configuration . 92Counter check . 94General . 94Initiation . 94Reception of the CounterCheck message by the UE . 94RRC connection re-establishment. 95General . 95Initiation . 95Actions following cell selection while T311 is running . 97Actions related to transmission of RRCReestablishmentRequest message . 99Reception of the RRCReestablishment by the UE . 100T311 expiry . 101T301 expiry or selected cell no longer suitable . 101Reception of the RRCSetup by the UE . 101RRC connection release . 101General . 101Initiation . 102Reception of the RRCRelease by the UE . 102T320 expiry . 104UE actions upon the expiry of DataInactivityTimer . 104RRC connection release requested by upper layers . 105General . 105Initiation . 105Radio link failure related actions . 105Detection of physical layer problems in RRC CONNECTED . 105Recovery of physical layer problems . 105Detection of radio link failure . 105RLF cause determination . 107RLF report content determination . 108UE actions upon going to RRC IDLE . 110UE actions upon PUCCH/SRS release request . 111RRC connection resume . 112General . 112Conditions for resuming RRC Connection for sidelink communication. 113Initiation . 113Actions related to transmission of RRCResumeRequest or RRCResumeRequest1 message . 115Reception of the RRCResume by the UE . 116T319 expiry or Integrity check failure from lower layers while T319 is running . 119Cell re-selection or cell selection while T390, T319 or T302 is running (UE inRRC INACTIVE) . 1205.3.13.7Reception of the RRCSetup by the UE . 1205.3.13.8RNA update. 1205.3.13.9Reception of the RRCRelease by the UE . 1205.3.13.10Reception of the RRCReject by the UE . 1215.3.13.11Inability to comply with RRCResume . 1215.3.13.12Inter RAT cell reselection . 1215.3.14Unified Access Control . 1215.3.14.1General . 1215.3.14.2Initiation .

ETSI 3GPP TS 38.331 version 16.3.1 Release 16 2 ETSI TS 138 331 V16.3.1 (2021-01) Intellectual Property Rights Essential patents IPRs essential or potentially essential to normative deliverables may have been declared to ETSI.