ETSI TS 138 331 V15.2.1 (2018-06)

5G; NR; Radio Resource Control (RRC); Protocol specification (3GPP TS 38.331 version 15.2.1 Release 15)

DTS/TSGR-0238331vf21

General Information

• Status: Published
• Publication Date: 28-Jun-2018
• Technical Committee: 3GPP RAN 2 - Radio layer 2 specification and Radio layer 3 RR specification
• Current Stage: 12 - Completion
• Completion Date: 29-Jun-2018

Standards Content (Sample)

ETSI TS 138 331 V15.2.1 (2018-06)






TECHNICAL SPECIFICATION
5G;
NR;
Radio Resource Control (RRC);
Protocol specification
(3GPP TS 38.331 version 15.2.1 Release 15)

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3GPP TS 38.331 version 15.2.1 Release 15 1 ETSI TS 138 331 V15.2.1 (2018-06)



Reference
RTS/TSGR-0238331vf21
Keywords
5G
ETSI
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3GPP TS 38.331 version 15.2.1 Release 15 2 ETSI TS 138 331 V15.2.1 (2018-06)
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
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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
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Modal verbs terminology
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"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 TS 38.331 version 15.2.1 Release 15 3 ETSI TS 138 331 V15.2.1 (2018-06)
Contents
Intellectual Property Rights . 2
Foreword . 2
Modal verbs terminology . 2
Foreword . 11
1 Scope . 12
2 References . 12
3 Definitions, symbols and abbreviations . 13
3.1 Definitions . 13
3.2 Abbreviations . 13
4 General . 15
4.1 Introduction . 15
4.2 Architecture . 15
4.2.1 UE states and state transitions including inter RAT . 15
4.2.2 Signalling radio bearers . 18
4.3 Services . 18
4.3.1 Services provided to upper layers . 18
4.3.2 Services expected from lower layers . 18
4.4 Functions . 18
5 Procedures . 19
5.1 General . 19
5.1.1 Introduction. 19
5.1.2 General requirements . 19
5.2 System information . 19
5.2.1 Introduction. 20
5.2.2 System information acquisition . 20
5.2.2.1 General UE requirements . 20
5.2.2.2 SI validity and need to (re)-acquire SI . 21
5.2.2.2.1 SI validity . 21
5.2.2.2.2 SI change indication and PWS notification . 21
5.2.2.3 Acquisition of System Information . 22
5.2.2.3.1 Acquisition of MIB and SIB1 . 22
5.2.2.3.2 Acquisition of an SI message . 22
5.2.2.3.3 Request for on demand system information . 23
5.2.2.4 Actions upon receipt of SI message . 24
5.2.2.4.1 Actions upon reception of the MIB . 24
5.2.2.4.2 Actions upon reception of the SystemInformationBlockType1 . 24
5.2.2.4.3 Actions upon reception of SystemInformationBlockTypeX . 24
5.2.2.5 Essential system information missing . 24
5.3 Connection control . 25
5.3.1 Introduction. 25
5.3.2 Paging . 25
5.3.3 RRC connection establishment . 25
5.3.4 Initial security activation . 25
5.3.5 RRC reconfiguration . 25
5.3.5.1 General . 25
5.3.5.2 Initiation . 26
5.3.5.3 Reception of an RRCReconfiguration by the UE . 26
5.3.5.4 Secondary cell group release . 27
5.3.5.5 Cell Group configuration . 27
5.3.5.5.1 General . 27
5.3.5.5.2 Reconfiguration with sync . 28
5.3.5.5.3 RLC bearer release . 28
5.3.5.5.4 RLC bearer addition/modification . 28
5.3.5.5.5 MAC entity configuration . 29
ETSI

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3GPP TS 38.331 version 15.2.1 Release 15 4 ETSI TS 138 331 V15.2.1 (2018-06)
5.3.5.5.6 RLF Timers & Constants configuration . 29
5.3.5.5.7 SPCell Configuration . 30
5.3.5.5.8 SCell Release . 30
5.3.5.5.9 SCell Addition/Modification . 30
5.3.5.6 Radio Bearer configuration . 30
5.3.5.6.1 General . 30
5.3.5.6.2 SRB release . 31
5.3.5.6.3 SRB addition/modification . 31
5.3.5.6.4 DRB release . 32
5.3.5.6.5 DRB addition/modification . 32
5.3.5.7 Security key update . 33
5.3.5.8 Reconfiguration failure . 33
5.3.5.8.1 Integrity check failure . 33
5.3.5.8.2 Inability to comply with RRCReconfiguration . 33
5.3.5.8.3 T304 expiry (Reconfiguration with sync Failure) . 34
5.3.5.9 Other configuration . 34
5.3.5.10 EN-DC release . 34
5.3.6 Counter check . 34
5.3.7 RRC connection re-establishment . 34
5.3.9 RRC connection release requested by upper layers . 34
5.3.10 Radio link failure related actions . 34
5.3.10.1 Detection of physical layer problems in RRC_CONNECTED . 34
5.3.10.2 Recovery of physical layer problems . 35
5.3.10.3 Detection of radio link failure . 35
5.3.11 UE actions upon leaving RRC_CONNECTED . 35
5.3.12 UE actions upon PUCCH/SRS release request . 36
5.4 Inter-RAT mobility. 36
5.5 Measurements . 36
5.5.1 Introduction. 36
5.5.2 Measurement configuration . 37
5.5.2.1 General . 37
5.5.2.2 Measurement identity removal . 38
5.5.2.3 Measurement identity addition/modification . 38
5.5.2.4 Measurement object removal . 39
5.5.2.5 Measurement object addition/modification . 39
5.5.2.6 Reporting configuration removal . 40
5.5.2.7 Reporting configuration addition/modification . 41
5.5.2.8 Quantity configuration . 41
5.5.2.9 Measurement gap configuration . 41
5.5.2.10 Reference signal measurement timing configuration . 42
5.5.2.11 Measurement gap sharing configuration . 42
5.5.3 Performing measurements . 42
5.5.3.1 General . 42
5.5.3.2 Layer 3 filtering . 44
5.5.3.3 Derivation of cell measurement results . 44
5.5.3.3a Derivation of layer 3 beam filtered measurement . 45
5.5.4 Measurement report triggering . 45
5.5.4.1 General . 45
5.5.4.2 Event A1 (Serving becomes better than threshold) . 47
5.5.4.3 Event A2 (Serving becomes worse than threshold) . 47
5.5.4.4 Event A3 (Neighbour becomes offset better than SpCell) . 48
5.5.4.5 Event A4 (Neighbour becomes better than threshold) . 49
5.5.4.6 Event A5 (SpCell becomes worse than threshold1 and neighbour becomes better than
threshold2) . 49
5.5.4.7 Event A6 (Neighbour becomes offset better than SCell) . 50
5.5.5 Measurement reporting . 51
5.5.5.1 General . 51
5.5.5.2 Reporting of beam measurement information . 53
5.6 UE capabilities . 54
5.6.1 UE capability transfer . 54
5.6.1.1 General . 54
5.6.1.2 Initiation . 54
ETSI

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3GPP TS 38.331 version 15.2.1 Release 15 5 ETSI TS 138 331 V15.2.1 (2018-06)
5.6.1.3 Reception of the UECapabilityEnquiry by the UE . 54
5.6.1.4 Compilation of band combinations supported by the UE. 54
5.6.1.5 Compilation of baseband processing combinations supported by the UE. 54
5.7 Other . 55
5.7.1 DL information transfer . 55
5.7.2 UL information transfer . 55
5.7.3 SCG failure information . 55
5.7.3.1 General . 55
5.7.3.2 Initiation . 55
5.7.3.3 Failure type determination . 56
5.7.3.4 Setting the contents of MeasResultSCG-Failure . 56
6 Protocol data units, formats and parameters (ASN.1) . 58
6.1 General . 58
6.1.1 Introduction. 58
6.1.2 Need codes and conditions for optional downlink fields . 58
6.2 RRC messages . 59
6.2.1 General message structure . 59
– NR-RRC-Definitions . 59
– BCCH-BCH-Message . 59
– DL-DCCH-Message . 59
– UL-DCCH-Message . 60
6.2.2 Message definitions . 60
– MIB . 60
– MeasurementReport . 62
– RRCReconfiguration . 63
– RRCReconfigurationComplete . 64
– SIB1 . 64
6.3 RRC information elements . 66
6.3.0 Parameterized types . 66
– SetupRelease . 66
6.3.1 System information blocks . 66
6.3.2 Radio resource control information elements . 67
– AdditionalSpectrumEmission . 67
– Alpha . 67
– ARFCN-ValueNR . 67
– BWP . 67
– BWP-Id . 71
– BeamFailureRecoveryConfig . 71
– CellGroupConfig . 74
– CellGroupId . 76
– CodebookConfig . 76
– ConfiguredGrantConfig . 78
– ControlResourceSet. 81
– ControlResourceSetId . 82
– CrossCarrierSchedu
...