5G; NR; Radio Resource Control (RRC); Protocol specification (3GPP TS 38.331 version 15.7.0 Release 15)

RTS/TSGR-0238331vf70

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Status
Published
Publication Date
14-Oct-2019
Current Stage
12 - Completion
Completion Date
15-Oct-2019
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ETSI TS 138 331 V15.7.0 (2019-10) - 5G; NR; Radio Resource Control (RRC); Protocol specification (3GPP TS 38.331 version 15.7.0 Release 15)
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ETSI TS 138 331 V15.7.0 (2019-10)
TECHNICAL SPECIFICATION
5G;
NR;
Radio Resource Control (RRC);
Protocol specification
(3GPP TS 38.331 version 15.7.0 Release 15)
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3GPP TS 38.331 version 15.7.0 Release 15 1 ETSI TS 138 331 V15.7.0 (2019-10)
Reference
RTS/TSGR-0238331vf70
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3GPP TS 38.331 version 15.7.0 Release 15 2 ETSI TS 138 331 V15.7.0 (2019-10)
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ETSI
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3GPP TS 38.331 version 15.7.0 Release 15 3 ETSI TS 138 331 V15.7.0 (2019-10)
Contents

Intellectual Property Rights ................................................................................................................................ 2

Legal Notice ....................................................................................................................................................... 2

Modal verbs terminology .................................................................................................................................... 2

Foreword ........................................................................................................................................................... 15

1 Scope ...................................................................................................................................................... 16

2 References .............................................................................................................................................. 16

3 Definitions, symbols and abbreviations ................................................................................................. 18

3.1 Definitions ........................................................................................................................................................ 18

3.2 Abbreviations ................................................................................................................................................... 18

4 General ................................................................................................................................................... 20

4.1 Introduction ...................................................................................................................................................... 20

4.2 Architecture ...................................................................................................................................................... 20

4.2.1 UE states and state transitions including inter RAT ................................................................................... 20

4.2.2 Signalling radio bearers .............................................................................................................................. 22

4.3 Services ............................................................................................................................................................ 23

4.3.1 Services provided to upper layers ............................................................................................................... 23

4.3.2 Services expected from lower layers .......................................................................................................... 23

4.4 Functions .......................................................................................................................................................... 23

5 Procedures .............................................................................................................................................. 24

5.1 General ............................................................................................................................................................. 24

5.1.1 Introduction................................................................................................................................................. 24

5.1.2 General requirements .................................................................................................................................. 24

5.1.3 Requirements for UE in MR-DC ................................................................................................................ 25

5.2 System information .......................................................................................................................................... 25

5.2.1 Introduction................................................................................................................................................. 25

5.2.2 System information acquisition .................................................................................................................. 26

5.2.2.1 General UE requirements ...................................................................................................................... 26

5.2.2.2 SIB validity and need to (re)-acquire SIB ............................................................................................. 27

5.2.2.2.1 SIB validity ...................................................................................................................................... 27

5.2.2.2.2 SI change indication and PWS notification ..................................................................................... 27

5.2.2.3 Acquisition of System Information ....................................................................................................... 28

5.2.2.3.1 Acquisition of MIB and SIB1 ........................................................................................................... 28

5.2.2.3.2 Acquisition of an SI message .......................................................................................................... 29

5.2.2.3.3 Request for on demand system information .................................................................................... 29

5.2.2.3.4 Actions related to transmission of RRCSystemInfoRequest message .............................................. 30

5.2.2.4 Actions upon receipt of System Information ........................................................................................ 30

5.2.2.4.1 Actions upon reception of the MIB .................................................................................................. 30

5.2.2.4.2 Actions upon reception of the SIB1 ................................................................................................. 31

5.2.2.4.3 Actions upon reception of SIB2 ....................................................................................................... 33

5.2.2.4.4 Actions upon reception of SIB3 ....................................................................................................... 34

5.2.2.4.5 Actions upon reception of SIB4 ....................................................................................................... 34

5.2.2.4.6 Actions upon reception of SIB5 ....................................................................................................... 35

5.2.2.4.7 Actions upon reception of SIB6 ....................................................................................................... 35

5.2.2.4.8 Actions upon reception of SIB7 ....................................................................................................... 35

5.2.2.4.9 Actions upon reception of SIB8 ....................................................................................................... 36

5.2.2.4.10 Actions upon reception of SIB9 ....................................................................................................... 37

5.2.2.5 Essential system information missing ................................................................................................... 37

5.3 Connection control ........................................................................................................................................... 37

5.3.1 Introduction................................................................................................................................................. 37

5.3.1.1 RRC connection control ........................................................................................................................ 37

5.3.1.2 AS Security ........................................................................................................................................... 38

5.3.2 Paging ......................................................................................................................................................... 39

5.3.2.1 General .................................................................................................................................................. 39

ETSI
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3GPP TS 38.331 version 15.7.0 Release 15 4 ETSI TS 138 331 V15.7.0 (2019-10)

5.3.2.2 Initiation ................................................................................................................................................ 39

5.3.2.3 Reception of the Paging message by the UE ........................................................................................ 39

5.3.3 RRC connection establishment ................................................................................................................... 40

5.3.3.1 General .................................................................................................................................................. 40

5.3.3.2 Initiation ................................................................................................................................................ 41

5.3.3.3 Actions related to transmission of RRCSetupRequest mes sa ge ............................................................. 41

5.3.3.4 Reception of the RRCSetup by the UE .................................................................................................. 41

5.3.3.5 Reception of the RRCReject by the UE ................................................................................................. 43

5.3.3.6 Cell re-selection or cell selection while T390, T300 or T302 is running (UE in RRC_IDLE) ............. 43

5.3.3.7 T300 expiry ........................................................................................................................................... 43

5.3.3.8 Abortion of RRC connection establishment .......................................................................................... 43

5.3.4 Initial AS security activation ...................................................................................................................... 44

5.3.4.1 General .................................................................................................................................................. 44

5.3.4.2 Initiation ................................................................................................................................................ 44

5.3.4.3 Reception of the SecurityModeCommand by the UE ............................................................................ 44

5.3.5 RRC reconfiguration ................................................................................................................................... 45

5.3.5.1 General .................................................................................................................................................. 45

5.3.5.2 Initiation ................................................................................................................................................ 46

5.3.5.3 Reception of an RRCReconfiguration by the UE .................................................................................. 46

5.3.5.4 Secondary cell group release ................................................................................................................. 49

5.3.5.5 Cell Group configuration ...................................................................................................................... 49

5.3.5.5.1 General ............................................................................................................................................ 49

5.3.5.5.2 Reconfiguration with sync ............................................................................................................... 50

5.3.5.5.3 RLC bearer release .......................................................................................................................... 50

5.3.5.5.4 RLC bearer addition/modification ................................................................................................... 51

5.3.5.5.5 MAC entity configuration ............................................................................................................... 51

5.3.5.5.6 RLF Timers & Constants configuration .......................................................................................... 52

5.3.5.5.7 SpCell Configuration ....................................................................................................................... 52

5.3.5.5.8 SCell Release ................................................................................................................................... 52

5.3.5.5.9 SCell Addition/Modification ........................................................................................................... 53

5.3.5.6 Radio Bearer configuration ................................................................................................................... 53

5.3.5.6.1 General ............................................................................................................................................ 53

5.3.5.6.2 SRB release ..................................................................................................................................... 53

5.3.5.6.3 SRB addition/modification .............................................................................................................. 53

5.3.5.6.4 DRB release ..................................................................................................................................... 55

5.3.5.6.5 DRB addition/modification ............................................................................................................. 55

5.3.5.7 AS Security key update ......................................................................................................................... 57

5.3.5.8 Reconfiguration failure ......................................................................................................................... 59

5.3.5.8.1 Void ................................................................................................................................................. 59

5.3.5.8.2 Inability to comply with RRCReconfiguration ................................................................................ 59

5.3.5.8.3 T304 expiry (Reconfiguration with sync Failure) ........................................................................... 60

5.3.5.9 Other configuration ............................................................................................................................... 60

5.3.5.10 MR-DC release ..................................................................................................................................... 60

5.3.5.11 Full configuration .................................................................................................................................. 61

5.3.6 Counter check ............................................................................................................................................. 62

5.3.6.1 General .................................................................................................................................................. 62

5.3.6.2 Initiation ................................................................................................................................................ 62

5.3.6.3 Reception of the CounterCheck message by the UE ............................................................................. 62

5.3.7 RRC connection re-establishment ............................................................................................................... 63

5.3.7.1 General .................................................................................................................................................. 63

5.3.7.2 Initiation ................................................................................................................................................ 64

5.3.7.3 Actions following cell selection while T311 is running ........................................................................ 64

5.3.7.4 Actions related to transmission of RRCReestablishmentRequest message ........................................... 65

5.3.7.5 Reception of the RRCReestablishment by the UE ................................................................................. 66

5.3.7.6 T311 expiry ........................................................................................................................................... 66

5.3.7.7 T301 expiry or selected cell no longer suitable ..................................................................................... 66

5.3.7.8 Reception of the RRCSetup by the UE .................................................................................................. 67

5.3.8 RRC connection release .............................................................................................................................. 67

5.3.8.1 General .................................................................................................................................................. 67

5.3.8.2 Initiation ................................................................................................................................................ 67

5.3.8.3 Reception of the RRCRelease by the UE .............................................................................................. 67

5.3.8.4 T320 expiry ........................................................................................................................................... 69

ETSI
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3GPP TS 38.331 version 15.7.0 Release 15 5 ETSI TS 138 331 V15.7.0 (2019-10)

5.3.8.5 UE actions upon the expiry of DataInactivityTimer ............................................................................. 69

5.3.9 RRC connection release requested by upper layers .................................................................................... 69

5.3.9.1 General .................................................................................................................................................. 69

5.3.9.2 Initiation ................................................................................................................................................ 69

5.3.10 Radio link failure related actions ................................................................................................................ 69

5.3.10.1 Detection of physical layer problems in RRC_CONNECTED ............................................................. 69

5.3.10.2 Recovery of physical layer problems .................................................................................................... 70

5.3.10.3 Detection of radio link failure ............................................................................................................... 70

5.3.11 UE actions upon going to RRC_IDLE ........................................................................................................ 71

5.3.12 UE actions upon PUCCH/SRS release request ........................................................................................... 71

5.3.13 RRC connection resume ............................................................................................................................. 72

5.3.13.1 General .................................................................................................................................................. 72

5.3.13.2 Initiation ................................................................................................................................................ 73

5.3.13.3 Actions related to transmission of RRCResumeRequest or RRCResumeRequest1 message ................. 74

5.3.13.4 Reception of the RRCResume by the UE .............................................................................................. 75

5.3.13.5 T319 expiry or Integrity check failure from lower layers while T319 is running ................................. 76

5.3.13.6 Cell re-selection or cell selection while T390, T319 or T302 is running (UE in

RRC_INACTIVE) ................................................................................................................................ 76

5.3.13.7 Reception of the RRCSetup by the UE .................................................................................................. 77

5.3.13.8 RNA update........................................................................................................................................... 77

5.3.13.9 Reception of the RRCRelease by the UE .............................................................................................. 77

5.3.13.10 Reception of the RRCReject by the UE ................................................................................................. 77

5.3.13.11 Inability to comply with RRCResume ................................................................................................... 77

5.3.13.12 Inter RAT cell reselection ..................................................................................................................... 77

5.3.14 Unified Access Control ............................................................................................................................... 78

5.3.14.1 General .................................................................................................................................................. 78

5.3.14.2 Initiation ................................................................................................................................................ 78

5.3.14.3 Void....................................................................................................................................................... 80

5.3.14.4 T302, T390 expiry or stop (Barring alleviation) ................................................................................... 80

5.3.14.5 Access barring check............................................................................................................................. 80

5.3.15 RRC connection reject ................................................................................................................................ 81

5.3.15.1 Initiation ................................................................................................................................................ 81

5.3.15.2 Reception of the RRCReject by the UE ................................................................................................. 81

5.4 Inter-RAT mobility........................................................................................................................................... 81

5.4.1 Introduction................................................................................................................................................. 81

5.4.2 Handover to NR .......................................................................................................................................... 82

5.4.2.1 General .................................................................................................................................................. 82

5.4.2.2 Initiation ................................................................................................................................................ 82

5.4.2.3 Reception of the RRCReconfiguration by the UE ................................................................................. 82

5.4.3 Mobility from NR ....................................................................................................................................... 83

5.4.3.1 General .................................................................................................................................................. 83

5.4.3.2 Initiation ................................................................................................................................................ 83

5.4.3.3 Reception of the MobilityFromNRCommand by the UE....................................................................... 83

5.4.3.4 Successful completion of the mobility from NR ................................................................................... 83

5.4.3.5 Mobility from NR failure ...................................................................................................................... 84

5.5 Measurements .......
...

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