3GPP TS 38.331 V15.0.0 (2017-12)
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`Technical Specification
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`3rd Generation Partnership Project;
`Technical Specification Group Radio Access Network
`NR
`Radio Resource Control (RRC) protocol specification
`(Release 15)
`
`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.
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`3GPP TS 38.331 V15.0.0 (2017-12)
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`Release 15
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`3GPP
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`Postal address
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`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
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`Internet
`http://www.3gpp.org
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`Copyright Notification
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`No part may be reproduced except as authorized by written permission.
`The copyright and the foregoing restriction extend to reproduction in all media.
`
`© 2017, 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC).
`All rights reserved.
`
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`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
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`3GPP TS 38.331 V15.0.0 (2017-12)
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`Contents
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`Foreword ............................................................................................................................................................ 8 
`1 
`Scope ........................................................................................................................................................ 9 
`2 
`References ................................................................................................................................................ 9 
`3 
`Definitions, symbols and abbreviations ................................................................................................. 10 
`3.1 
`Definitions ........................................................................................................................................................... 10 
`3.2 
`Abbreviations ...................................................................................................................................................... 10 
`4 
`General ................................................................................................................................................... 11 
`4.1 
`Introduction ......................................................................................................................................................... 11 
`4.2 
`Architecture ......................................................................................................................................................... 12 
`4.2.1 
`UE states and state transitions including inter RAT ..................................................................................... 12 
`4.2.2 
`Signalling radio bearers ................................................................................................................................. 14 
`4.3 
`Services ............................................................................................................................................................... 14 
`4.3.1 
`Services provided to upper layers ................................................................................................................. 14 
`4.3.2 
`Services expected from lower layers ............................................................................................................ 14 
`4.4 
`Functions ............................................................................................................................................................. 14 
`5 
`Procedures .............................................................................................................................................. 15 
`5.1 
`General ................................................................................................................................................................ 15 
`5.1.1 
`Introduction ................................................................................................................................................... 15 
`5.1.2 
`General requirements .................................................................................................................................... 16 
`5.2 
`System information ............................................................................................................................................. 16 
`5.2.1 
`Introduction ................................................................................................................................................... 16 
`5.2.2 
`System information acquisition .................................................................................................................... 17 
`5.2.2.1 
`General UE requirements ........................................................................................................................ 17 
`5.2.2.2 
`SI validity and need to (re)-acquire SI .................................................................................................... 17 
`5.2.2.2.1 
`SI validity ........................................................................................................................................... 18 
`5.2.2.2.2 
`SI change indication and PWS notification ...................................................................................... 18 
`5.2.2.3 
`Acquisition of System Information ......................................................................................................... 18 
`5.2.2.3.1 
`Acquisition of MIB and SIB1 ............................................................................................................ 18 
`5.2.2.3.2 
`Acquisition of an SI message ............................................................................................................ 19 
`5.2.2.3.3 
`Request for on demand system information ...................................................................................... 20 
`5.2.2.4 
` Actions upon receipt of SI message ....................................................................................................... 20 
`5.2.2.4.1 
`Actions upon reception of the MasterInformationBlock .................................................................. 20 
`5.2.2.4.2 
`Actions upon reception of the SystemInformationBlockType1 ....................................................... 21 
`5.2.2.4.3 
`Actions upon reception of SystemInformationBlockTypeX ............................................................ 21 
`5.2.2.5 
`Essential system information missing ..................................................................................................... 21 
`5.3 
`Connection control .............................................................................................................................................. 21 
`5.3.1 
`Introduction ................................................................................................................................................... 22 
`5.3.2 
`Paging ............................................................................................................................................................ 22 
`5.3.3 
`RRC connection establishment ..................................................................................................................... 22 
`5.3.4 
`Initial security activation ............................................................................................................................... 22 
`5.3.5 
`RRC reconfiguration ..................................................................................................................................... 22 
`5.3.5.1 
`General ..................................................................................................................................................... 22 
`5.3.5.2 
`Initiation ................................................................................................................................................... 23 
`5.3.5.3 
`Reception of an RRCReconfiguration by the UE ................................................................................... 23 
`5.3.5.4 
`Secondary cell group release ................................................................................................................... 24 
`5.3.5.5 
`Cell Group configuration ......................................................................................................................... 24 
`5.3.5.5.1 
`General ............................................................................................................................................... 24 
`5.3.5.5.2 
`Reconfiguration with sync ................................................................................................................. 25 
`5.3.5.5.3 
`RLC bearer release ............................................................................................................................. 26 
`5.3.5.5.4 
`RLC bearer addition/modification ..................................................................................................... 26 
`5.3.5.5.5 
`MAC entity configuration ................................................................................................................. 27 
`5.3.5.5.6 
`RLF Timers & Constants configuration ............................................................................................ 27 
`5.3.5.5.7 
`SpCell Configuration ......................................................................................................................... 27 
`5.3.5.5.8 
`SCell Release ..................................................................................................................................... 27 
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`5.3.5.5.9 
`5.3.5.6 
`5.3.5.6.1 
`5.3.5.6.2 
`5.3.5.6.3 
`5.3.5.6.4 
`5.3.5.6.5 
`5.3.5.7 
`5.3.5.9 
`5.3.5.9.1 
`5.3.5.9.2 
`5.3.5.9.3 
`5.3.6 
`5.3.7 
`5.3.8 
`5.3.9 
`5.3.10 
`5.3.11 
`5.3.11.1 
`5.3.11.2 
`5.3.11.3 
`5.3.12 
`5.3.13 
`5.4 
`5.5 
`5.5.1 
`5.5.2 
`5.5.2.1 
`5.5.2.2 
`5.5.2.3 
`5.5.2.4 
`5.5.2.5 
`5.5.2.6 
`5.5.2.7 
`5.5.2.8 
`5.5.2.9 
`5.5.2.10 
`5.5.3 
`5.5.3.1 
`5.5.3.2 
`5.5.3.3 
`5.5.4 
`5.5.4.1 
`5.5.4.2 
`5.5.4.3 
`5.5.4.4 
`5.5.4.5 
`5.5.4.6 
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`5.5.4.7 
`5.5.5 
`5.5.5.1 
`5.5.5.2 
`5.6 
`5.6.1 
`5.7 
`5.7.1 
`5.7.2 
`5.7.3 
`5.7.3.1 
`5.7.3.2 
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`3GPP TS 38.331 V15.0.0 (2017-12)
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`SCell Addition/Modification ............................................................................................................. 27 
`Radio Bearer configuration ..................................................................................................................... 28 
`General ............................................................................................................................................... 28 
`SRB release ........................................................................................................................................ 28 
`SRB addition/ modification ............................................................................................................... 28 
`DRB release ....................................................................................................................................... 29 
`DRB addition/ modification .............................................................................................................. 29 
`Full configuration .................................................................................................................................... 30 
`Reconfiguration failure ............................................................................................................................ 32 
`Integrity check failure ........................................................................................................................ 32 
`Inability to comply with RRCReconfiguration ................................................................................. 32 
`T304 expiry (Reconfiguration with sync Failure) ............................................................................. 32 
`Counter check ................................................................................................................................................ 33 
`RRC connection re-establishment ................................................................................................................. 33 
`RRC connection release ................................................................................................................................ 33 
`RRC connection release requested by upper layers ..................................................................................... 33 
`Radio resource configuration ........................................................................................................................ 33 
`Radio link failure related actions .................................................................................................................. 33 
`Detection of physical layer problems in RRC_CONNECTED .............................................................. 33 
`Recovery of physical layer problems ...................................................................................................... 33 
`Detection of radio link failure ................................................................................................................. 34 
`UE actions upon leaving RRC_CONNECTED ............................................................................................ 34 
`UE actions upon PUCCH/SRS release request ............................................................................................ 35 
`Inter-RAT mobility ............................................................................................................................................. 35 
`Measurements ..................................................................................................................................................... 35 
`Introduction ................................................................................................................................................... 35 
`Measurement configuration .......................................................................................................................... 37 
`General ..................................................................................................................................................... 37 
`Measurement identity removal ................................................................................................................ 38 
`Measurement identity addition/ modification ......................................................................................... 38 
`Measurement object removal .................................................................................................................. 38 
`Measurement object addition/ modification ........................................................................................... 39 
`Reporting configuration removal ............................................................................................................ 40 
`Reporting configuration addition/ modification ..................................................................................... 40 
`Quantity configuration ............................................................................................................................. 41 
`Measurement gap configuration .............................................................................................................. 41 
`Reference signal measurement timing configuration ............................................................................. 41 
`Performing measurements ............................................................................................................................. 41 
`General ..................................................................................................................................................... 41 
`Layer 3 filtering ....................................................................................................................................... 43 
`Derivation of measurement results .......................................................................................................... 43 
`Measurement report triggering ...................................................................................................................... 44 
`General ..................................................................................................................................................... 44 
`Event A1 (Serving becomes better than threshold) ................................................................................ 46 
`Event A2 (Serving becomes worse than threshold) ................................................................................ 46 
`Event A3 (Neighbour becomes offset better than PCell/ PSCell) .......................................................... 47 
`Event A4 (Neighbour becomes better than threshold) ........................................................................... 47 
`Event A5 (PCell/ PSCell becomes worse than threshold1 and neighbour becomes better than
`threshold2) ............................................................................................................................................... 48 
`Event A6 (Neighbour becomes offset better than SCell) ....................................................................... 49 
`Measurement reporting ................................................................................................................................. 50 
`General ..................................................................................................................................................... 50 
`Reporting of beam measurement information ........................................................................................ 52 
`UE capabilities .................................................................................................................................................... 52 
`UE capability transfer .................................................................................................................................... 52 
`Other .................................................................................................................................................................... 53 
`DL information transfer ................................................................................................................................ 53 
`UL information transfer ................................................................................................................................ 53 
`SCG failure information ................................................................................................................................ 53 
`General ..................................................................................................................................................... 53 
`Initiation ................................................................................................................................................... 54 
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`Failure type determination ....................................................................................................................... 54 
`5.7.3.3 
`Setting the contents of FailureReportSCG-ToOtherRAT ....................................................................... 55 
`5.7.3.4 
`6 
`Protocol data units, formats and parameters (ASN.1) ............................................................................ 56 
`6.1 
`General ................................................................................................................................................................ 56 
`6.1.1 
`Introduction ................................................................................................................................................... 56 
`6.1.2 
`Need codes for optional downlink fields ...................................................................................................... 56 
`6.2 
`RRC messages ..................................................................................................................................................... 57 
`6.2.1 
`General message structure ............................................................................................................................. 57 
`– 
`NR-RRC-Definitions ................................................................................................................................ 57 
`– 
`BCCH-BCH-Message .............................................................................................................................. 58 
`– 
`DL-DCCH-Message ................................................................................................................................ 58 
`– 
`UL-DCCH-Message ................................................................................................................................ 59 
`6.2.2 
`Message definitions ....................................................................................................................................... 59 
`– 
`MIB .......................................................................................................................................................... 59 
`– 
`MeasurementReport ................................................................................................................................ 61 
`– 
`RRCReconfiguration ................................................................................................................................ 61 
`– 
`RRCReconfigurationComplete ................................................................................................................ 63 
`– 
`SIB1 .......................................................................................................................................................... 64 
`6.3 
`RRC information elements ................................................................................................................................. 65 
`– 
`SetupRelease Information Element ......................................................................................................... 65 
`6.3.1 
`System information blocks ............................................................................................................................ 65 
`6.3.2 
`Radio resource control information elements ............................................................................................... 65 
`– 
`DRB-Identity ............................................................................................................................................ 65 
`– 
`BandwidthPart-Config ............................................................................................................................ 66 
`– 
`CellGroupConfig ..................................................................................................................................... 67 
`– 
`CellIndexList ............................................................................................................................................ 69 
`– 
`ControlResourceIndex ............................................................................................................................. 70 
`– 
`CrossCarrierSchedulingConfig ............................................................................................................... 70 
`– 
`CSI-MeasConfig ...................................................................................................................................... 71 
`– 
`FailureReportSCG-ToOtherRAT ............................................................................................................ 78 
`– 
`FrequencyInfoUL ..................................................................................................................................... 79 
`– 
`LogicalChannelConfig ............................................................................................................................ 80 
`– 
`MAC-CellGroupConfig ........................................................................................................................... 81 
`– 
`MeasConfig .............................................................................................................................................. 86 
`– 
`MeasId ..................................................................................................................................................... 87 
`– 
`MeasIdToAddModList ............................................................................................................................. 88 
`– 
`MeasObjectEUTRA ................................................................................................................................. 88 
`– 
`MeasObjectId ........................................................................................................................................... 88 
`– 
`MeasObjectNR ......................................................................................................................................... 89 
`– 
`MeasObjectToAddModList ...................................................................................................................... 94 
`– 
`MeasResults ............................................................................................................................................. 95 
`– 
`PDCCH-Config ....................................................................................................................................... 99 
`– 
`PDCP-Config ......................................................................................................................................... 102 
`– 
`PDSCH-Config ...................................................................................................................................... 106 
`– 
`PhysCellId .............................................................................................................................................. 109 
`– 
`PUCCH-Config ..................................................................................................................................... 109 
`– 
`PUSCH-Config ...................................................................................................................................... 112 
`– 
`Q-OffsetRange ....................................................................................................................................... 115 
`– 
`QuantityConfig ...................................................................................................................................... 115 
`– 
`RACH-ConfigCommon .......................................................................................................................... 116 
`– 
`RACH-ConfigDedicated ........................................................................................................................ 118 
`– 
`RadioBearerConfig ................................................................................................................................ 119 
`– 
`ReportConfigId ...................................................................................................................................... 121 
`– 
`ReportConfigNR .................................................................................................................................... 121 
`– 
`ReportConfigToAddModList ................................................................................................................. 125 
`– 
`RLC-Config ............................................................................................................................................ 126 
`– 
`RLF-TimersAndConstants ..................................................................................................................... 128 
`– 
`SCellIndex .............................................................................................................................................. 129 
`– 
`SchedulingRequest-Config .................................................................................................................... 129 
`– 
`SchedulingRequestResource-Config ..................................................................................................... 130 
`– 
`SDAP-Config ......................................................................................................................................... 130 
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`SecurityAlgorithmConfig ....................................................................................................................... 131 
`– 
`ServCellIndex ......................................................................................................................................... 132 
`– 
`ServingCellConfigCommon ................................................................................................................... 133 
`– 
`ServingCellConfigDedicated ................................................................................................................. 135 
`– 
`SRB-Identity ........................................................................................................................................... 137 
`– 
`SPS-Config ............................................................................................................................................. 137 
`– 
`SRS-Config ............................................................................................................................................. 138 
`– 
`SubcarrierSpacing ................................................................................................................................. 140 
`– 
`UE capability information elements ........................................................................................................... 141 
`6.3.3 
`BandCombinationList ............................................................................................................................ 141 
`– 
`RAT-Type ............................................................................................................................................... 141 
`– 
`UE-CapabilityRAT-ContainerList ......................................................................................................... 142 
`– 
`UE-MRDC-Capability ........................................................................................................................... 142 
`– 
`UE-NR-Capability ................................................................................................................................. 143 
`– 
`Other information elements......................................................................................................................... 146 
`6.3.4 
`RRC multiplicity and type constraint values .................................................................................................... 146 
`6.4 
`Multiplicity and type constraint definitions ................................................................................................ 146 
`– 
`Variables and constants ........................................................................................................................ 148 
`7 
`Timers ................................................................................................................................................................ 148 
`7.1 
`Timers (Informative) .................