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3GPP TS 38.331 V18.0.0 (2023-12)
---
Technical Specification
3rd Generation Partnership Project;
Technical Specification Group Radio Access Network;
NR;
Radio Resource Control (RRC) protocol specification
(Release 18)
---
 
The present document has been developed within the 3rd Generation Partnership Project (3GPP ^TM^) and may be further elaborated for the purposes of 3GPP.\
The present document has not been subject to any approval process by the 3GPP Organizational Partners and shall not be implemented.\
This Specification is provided for future development work within 3GPP only. The Organizational Partners accept no liability for any use of this Specification.\
Specifications and Reports for implementation of the 3GPP ^TM^ system should be obtained via the 3GPP Organizational Partners\' Publications Offices.
`<div class="pagebreak"> </div>`{=html}
> ***3GPP***
>
> Postal address
>
> 3GPP support office address
>
> 650 Route des Lucioles - Sophia Antipolis
>
> Valbonne - FRANCE
>
> Tel.: +33 4 92 94 42 00 Fax: +33 4 93 65 47 16
>
> Internet
>
> http://www.3gpp.org
***Copyright Notification***
---
No part may be reproduced except as authorized by written permission.\
The copyright and the foregoing restriction extend to reproduction in all media.
© 2023, 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC).
All rights reserved.
UMTS™ is a Trade Mark of ETSI registered for the benefit of its members
3GPP™ is a Trade Mark of ETSI registered for the benefit of its Members and of the 3GPP Organizational Partners\
LTE™ is a Trade Mark of ETSI registered for the benefit of its Members and of the 3GPP Organizational Partners
GSM® and the GSM logo are registered and owned by the GSM Association
`<div class="pagebreak"> </div>`{=html}
# Contents {#contents .TT}
Foreword [26](#foreword)
1 Scope [27](#scope)
2 References [27](#references)
3 Definitions, symbols and abbreviations [30](#definitions-symbols-and-abbreviations)
3.1 Definitions [30](#definitions)
3.2 Abbreviations [32](#abbreviations)
4 General [36](#general)
4.1 Introduction [36](#introduction)
4.2 Architecture [36](#architecture)
4.2.1 UE states and state transitions including inter RAT [36](#ue-states-and-state-transitions-including-inter-rat)
4.2.2 Signalling radio bearers [39](#signalling-radio-bearers)
4.3 Services [40](#services)
4.3.1 Services provided to upper layers [40](#services-provided-to-upper-layers)
4.3.2 Services expected from lower layers [40](#services-expected-from-lower-layers)
4.4 Functions [40](#functions)
5 Procedures [41](#procedures)
5.1 General [41](#general-1)
5.1.1 Introduction [41](#introduction-1)
5.1.2 General requirements [42](#general-requirements)
5.1.3 Requirements for UE in MR-DC [42](#requirements-for-ue-in-mr-dc)
5.2 System information [43](#system-information)
5.2.1 Introduction [43](#introduction-2)
5.2.2 System information acquisition [44](#system-information-acquisition)
5.2.2.1 General UE requirements [44](#general-ue-requirements)
5.2.2.2 SIB validity and need to (re)-acquire SIB [44](#sib-validity-and-need-to-re-acquire-sib)
5.2.2.2.1 SIB validity [44](#sib-validity)
5.2.2.2.2 SI change indication and PWS notification [46](#si-change-indication-and-pws-notification)
5.2.2.3 Acquisition of System Information [47](#acquisition-of-system-information)
5.2.2.3.1 Acquisition of *MIB* and *SIB1* [47](#acquisition-of-mib-and-sib1)
5.2.2.3.2 Acquisition of an SI message [48](#acquisition-of-an-si-message)
5.2.2.3.3 Request for on demand system information [50](#request-for-on-demand-system-information)
5.2.2.3.3a Request for on demand positioning system information [51](#a-request-for-on-demand-positioning-system-information)
5.2.2.3.4 Actions related to transmission of *RRCSystemInfoRequest* message [53](#actions-related-to-transmission-of-rrcsysteminforequest-message)
5.2.2.3.5 Acquisition of SIB(s) or posSIB(s) in RRC_CONNECTED [53](#acquisition-of-sibs-or-possibs-in-rrc_connected)
5.2.2.3.6 Actions related to transmission of *DedicatedSIBRequest* message [54](#actions-related-to-transmission-of-dedicatedsibrequest-message)
5.2.2.4 Actions upon receipt of System Information [55](#actions-upon-receipt-of-system-information)
5.2.2.4.1 Actions upon reception of the *MIB* [55](#actions-upon-reception-of-the-mib)
5.2.2.4.2 Actions upon reception of the *SIB1* [55](#actions-upon-reception-of-the-sib1)
5.2.2.4.3 Actions upon reception of *SIB2* [61](#actions-upon-reception-of-sib2)
5.2.2.4.4 Actions upon reception of *SIB3* [62](#actions-upon-reception-of-sib3)
5.2.2.4.5 Actions upon reception of *SIB4* [62](#actions-upon-reception-of-sib4)
5.2.2.4.6 Actions upon reception of *SIB5* [63](#actions-upon-reception-of-sib5)
5.2.2.4.7 Actions upon reception of *SIB6* [63](#actions-upon-reception-of-sib6)
5.2.2.4.8 Actions upon reception of *SIB7* [63](#actions-upon-reception-of-sib7)
5.2.2.4.9 Actions upon reception of *SIB8* [64](#actions-upon-reception-of-sib8)
5.2.2.4.10 Actions upon reception of *SIB9* [65](#actions-upon-reception-of-sib9)
5.2.2.4.11 Actions upon reception of *SIB10* [66](#actions-upon-reception-of-sib10)
5.2.2.4.12 Actions upon reception of *SIB11* [66](#actions-upon-reception-of-sib11)
5.2.2.4.13 Actions upon reception of *SIB12* [66](#actions-upon-reception-of-sib12)
5.2.2.4.14 Actions upon reception of *SIB13* [67](#actions-upon-reception-of-sib13)
5.2.2.4.15 Actions upon reception of *SIB14* [67](#actions-upon-reception-of-sib14)
5.2.2.4.16 Actions upon reception of *SIBpos* [67](#actions-upon-reception-of-sibpos)
5.2.2.4.17 Actions upon reception of *SIB15* [67](#actions-upon-reception-of-sib15)
5.2.2.4.18 Actions upon reception of *SIB16* [67](#actions-upon-reception-of-sib16)
5.2.2.4.19 Actions upon reception of *SIB17* [68](#actions-upon-reception-of-sib17)
5.2.2.4.20 Actions upon reception of *SIB18* [68](#actions-upon-reception-of-sib18)
5.2.2.4.21 Actions upon reception of *SIB19* [68](#actions-upon-reception-of-sib19)
5.2.2.4.22 Actions upon reception of *SIB20* [68](#actions-upon-reception-of-sib20)
5.2.2.4.23 Actions upon reception of *SIB21* [68](#actions-upon-reception-of-sib21)
5.2.2.4.24 Actions upon reception of *SIB22* [68](#actions-upon-reception-of-sib22)
5.2.2.4.26 Actions upon reception of *SIB24* [69](#actions-upon-reception-of-sib24)
5.2.2.4.27 Actions upon reception of *SIB25* [69](#actions-upon-reception-of-sib25)
5.2.2.5 Essential system information missing [69](#essential-system-information-missing)
5.2.2.6 T430 expiry [70](#t430-expiry)
5.3 Connection control [70](#connection-control)
5.3.1 Introduction [70](#introduction-3)
5.3.1.1 RRC connection control [70](#rrc-connection-control)
5.3.1.2 AS Security [71](#as-security)
5.3.2 Paging [72](#paging)
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