ETSI TS 136 331 V15.8.0 (2020-01)

ETSI TS 136 331 V15.8.0 (2020-01)






TECHNICAL SPECIFICATION
LTE;
Evolved Universal Terrestrial Radio Access (E-UTRA);
Radio Resource Control (RRC);
Protocol specification
(3GPP TS 36.331 version 15.8.0 Release 15)

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3GPP TS 36.331 version 15.8.0 Release 15 1 ETSI TS 136 331 V15.8.0 (2020-01)



Reference
RTS/TSGR-0236331vf80
Keywords
LTE
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3GPP TS 36.331 version 15.8.0 Release 15 2 ETSI TS 136 331 V15.8.0 (2020-01)
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
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Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee
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Legal Notice
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. These shall be
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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

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3GPP TS 36.331 version 15.8.0 Release 15 3 ETSI TS 136 331 V15.8.0 (2020-01)
Contents
Intellectual Property Rights . 2
Legal Notice . 2
Modal verbs terminology . 2
Foreword . 22
1 Scope . 23
2 References . 23
3 Definitions, symbols and abbreviations . 27
3.1 Definitions . 27
3.2 Abbreviations . 29
4 General . 33
4.1 Introduction . 33
4.2 Architecture . 34
4.2.1 UE states and state transitions including inter RAT . 34
4.2.2 Signalling radio bearers . 38
4.3 Services . 39
4.3.1 Services provided to upper layers . 39
4.3.2 Services expected from lower layers . 40
4.4 Functions . 40
4.5 Data available for transmission for NB-IoT . 41
5 Procedures . 41
5.1 General . 41
5.1.1 Introduction. 41
5.1.2 General requirements . 42
5.1.3 Requirements for UE in MR-DC . 43
5.2 System information . 43
5.2.1 Introduction. 43
5.2.1.1 General . 43
5.2.1.2 Scheduling . 44
5.2.1.2a Scheduling for NB-IoT . 45
5.2.1.3 System information validity and notification of changes . 46
5.2.1.4 Indication of ETWS notification . 47
5.2.1.5 Indication of CMAS notification . 48
5.2.1.6 Notification of EAB parameters change . 48
5.2.1.7 Access Barring parameters change in NB-IoT . 48
5.2.2 System information acquisition . 49
5.2.2.1 General . 49
5.2.2.2 Initiation . 49
5.2.2.3 System information required by the UE . 49
5.2.2.4 System information acquisition by the UE . 50
5.2.2.5 Essential system information missing . 54
5.2.2.6 Actions upon reception of the MasterInformationBlock message . 55
5.2.2.7 Actions upon reception of the SystemInformationBlockType1 message . 55
5.2.2.8 Actions upon reception of SystemInformation messages . 57
5.2.2.9 Actions upon reception of SystemInformationBlockType2 . 57
5.2.2.10 Actions upon reception of SystemInformationBlockType3 . 58
5.2.2.11 Actions upon reception of SystemInformationBlockType4 . 59
5.2.2.12 Actions upon reception of SystemInformationBlockType5 . 59
5.2.2.13 Actions upon reception of SystemInformationBlockType6 . 60
5.2.2.14 Actions upon reception of SystemInformationBlockType7 . 61
5.2.2.15 Actions upon reception of SystemInformationBlockType8 . 61
5.2.2.16 Actions upon reception of SystemInformationBlockType9 . 62
5.2.2.17 Actions upon reception of SystemInformationBlockType10 . 62
5.2.2.18 Actions upon reception of SystemInformationBlockType11 . 62
ETSI

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3GPP TS 36.331 version 15.8.0 Release 15 4 ETSI TS 136 331 V15.8.0 (2020-01)
5.2.2.19 Actions upon reception of SystemInformationBlockType12 . 63
5.2.2.20 Actions upon reception of SystemInformationBlockType13 . 63
5.2.2.21 Actions upon reception of SystemInformationBlockType14 . 64
5.2.2.22 Actions upon reception of SystemInformationBlockType15 . 64
5.2.2.23 Actions upon reception of SystemInformationBlockType16 . 64
5.2.2.24 Actions upon reception of SystemInformationBlockType17 . 64
5.2.2.25 Actions upon reception of SystemInformationBlockType18 . 64
5.2.2.26 Actions upon reception of SystemInformationBlockType19 . 64
5.2.2.27 Actions upon reception of SystemInformationBlockType20 . 65
5.2.2.28 Actions upon reception of SystemInformationBlockType21 . 65
5.2.2.29 Actions upon reception of SystemInformationBlockType22-NB . 65
5.2.2.30 Actions upon reception of SystemInformationBlockType23-NB . 65
5.2.2.31 Actions upon reception of SystemInformationBlockType24 . 65
5.2.2.32 Actions upon reception of SystemInformationBlockType25 . 65
5.2.2.33 Actions upon reception of SystemInformationBlockType26 . 65
5.2.2.34 Actions upon reception of SystemInformationBlockPos . 66
5.2.3 Acquisition of an SI message . 66
5.2.3a Acquisition of an SI message by BL UE or UE in CE or a NB-IoT UE . 67
5.2.3b Acquisition of an SI message from MBMS-dedicated cell . 68
5.3 Connection control . 68
5.3.1 Introduction. 68
5.3.1.1 RRC connection control . 68
5.3.1.2 Security . 70
5.3.1.2a RN security . 72
5.3.1.3 Connected mode mobility . 72
5.3.1.4 Connection control in NB-IoT . 73
5.3.2 Paging . 74
5.3.2.1 General . 74
5.3.2.2 Initiation . 75
5.3.2.3 Reception of the Paging message by the UE . 75
5.3.3 RRC connection establishment . 76
5.3.3.1 General . 76
5.3.3.1a Conditions for establishing RRC Connection for sidelink communication/ discovery/ V2X
sidelink communication . 79
5.3.3.1b Conditions for initiating EDT . 80
5.3.3.2 Initiation . 81
5.3.3.3 Actions related to transmission of RRCConnectionRequest message . 87
5.3.3.3a Actions related to transmission of RRCConnectionResumeRequest message . 88
5.3.3.3b Actions related to transmission of RRCEarlyDataRequest message . 90
5.3.3.3c UE actions upon receiving EDT fallback indication from lower layers . 91
5.3.3.4 Reception of the RRCConnectionSetup by the UE . 91
5.3.3.4a Reception of the RRCConnectionResume by the UE . 94
5.3.3.4b Reception of the RRCEarlyDataComplete by the UE . 98
5.3.3.5 Cell re-selection or cell selection while T300, T302, T303, T305, T306, T308 or T309 is running . 99
5.3.3.6 T300 expiry . 100
5.3.3.7 T302, T303, T305, T306, or T308 expiry or stop . 102
5.3.3.8 Reception of the RRCConnectionReject by the UE . 102
5.3.3.9 Abortion of RRC connection establishment . 104
5.3.3.9a Abortion of UP-EDT . 104
5.3.3.10 Handling of SSAC related parameters . 104
5.3.3.11 Access barring check. 105
5.3.3.12 EAB check . 106
5.3.3.13 Access barring check for ACDC . 107
5.3.3.14 Access Barring check for NB-IoT . 107
5.3.3.15 Failure to deliver NAS information in RRCConnectionSetupComplete message . 109
5.3.3.16 Integrity check failure from lower layers while T300 is running for UP-EDT or
RRC_INACTIVE . 109
5.3.3.17 Inability to comply with RRCConnectionResume . 110
5.3.4 Initial security activation . 110
5.3.4.1 General . 110
5.3.4.2 Initiation . 110
5.3.4.3 Reception of the SecurityModeCommand by the UE . 110
ETSI

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3GPP TS 36.331 version 15.8.0 Release 15 5 ETSI TS 136 331 V15.8.0 (2020-01)
5.3.5 RRC connection reconfiguration . 112
5.3.5.1 General . 112
5.3.5.2 Initiation . 112
5.3.5.3 Reception of an RRCConnectionReconfiguration not including the mobilityControlInfo by the
UE . 112
5.3.5.4 Reception of an RRCConnectionReconfiguration including the mobilityControlInfo by the UE
(handover) . 115
5.3.5.5 Reconfiguration failure . 121
5.3.5.6 T304 expiry (handover failure) . 121
5.3.5.7 Void. 123
5.3.5.7a T307 expiry (SCG change failure) . 123
5.3.5.8 Radio Configuration involving full configuration option. 123
5.3.6 Counter check . 125
5.3.6.1 General . 125
5.3.6.2 Initiation . 125
5.3.6.3 Reception of the CounterCheck message by the UE . 125
5.3.7 RRC connection re-establishment . 126
5.3.7.1 General . 126
5.3.7.2 Initiation . 127
5.3.7.3 Actions following cell selection while T311 is running . 129
5.3.7.4 Actions related to transmission of RRCConnectionReestablishmentRequest message . 129
5.3.7.5 Reception of the RRCConnectionReestablishment by the UE . 130
5.3.7.6 T311 expiry . 133
5.3.7.7 T301 expiry or selected cell no longer suitable . 134
5.3.7.8 Reception of RRCConnectionReestablishmentReject by the UE . 134
5.3.8 RRC connection release . 134
5.3.8.1 General . 134
5.3.8.2 Initiation . 134
5.3.8.3 Reception of the RRCConnectionRelease by the UE . 134
5.3.8.4 T320 expiry . 137
5.3.8.5 T322 expiry or stop . 137
5.3.8.6 UE actions upon receiving the expiry of DataInactivityTimer . 137
5.3.8.7 UE actions upon entering RRC_INACTIVE . 137
5.3.9 RRC connection release requested by upper layers . 138
5.3.9.1 General . 138
5.3.9.2 Initiation . 138
5.3.10 Radio resource configuration . 138
5.3.10.0 General . 138
5.3.10.1 SRB addition/ modification . 139
5.3.10.1a SCG RLC bearer addition or reconfiguration for SRBs . 141
5.3.10.2 DRB release . 141
5.3.10.3 DRB addition/ modification . 142
5.3.10.3a1 DC specific DRB addition or reconfiguration . 143
5.3.10.3a2 LWA specific DRB addition or reconfiguration . 146
5.3.10.3a3 LWIP specific DRB addition or reconfiguration. 147
5.3.10.3a4 SCG RLC bearer addition or reconfiguration for DRBs in NE-DC . 148
5.3.10.3a SCell release . 148
5.3.10.3b SCell addition/ modification . 148
5.3.10.3c PSCell addition or modification . 149
5.3.10.3d SCell group release . 149
5.3.10.3e SCell group addition/ modification . 149
5.3.10.4 MAC main reconfiguration .
...