[PDF] TS 138 331 - V16.1.0 - 5G; NR; Radio Resource Control (RRC

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ETSI TS 138 331 V16.1.0 (2020-07)

5G; NR;

Radio Resource Control (RRC);

Protocol specification

(3GPP TS 38.331 version 16.1.0 Release 16)

TECHNICAL SPECIFICATION

ETSI ETSI TS 138 331 V16.1.0 (2020-07)13GPP TS 38.331 version 16.1.0 Release 16

Reference

RTS/TSGR-0238331vg10

Keywords

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Content

1 Scope ........................................................................

.............................................................................. 21守

2 References ........................................................................

............................ 21守

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

.......................... 23守

3.1 Definitions ........................................................................

................................................................................ 23守

3.2 Abbreviations ........................................................................

........................................................................... 25守

4 General ........................................................................

........................................................................... 27守

4.1 Introduction ........................................................................

.............................................................................. 27守

4.2 Architecture ........................................................................

.............................................................................. 27守

4.2.1 UE s tates and state transitions including inter RAT ................................................................................... 27守

4.2.2 Sign alling radio bearers ........................................................................

...................................................... 29守

4.3 Services ........................................................................

.................................................................................... 30守

4.3.1 Serv ices provided to upper layers ........................................................................

....................................... 30守

4.3.2 Serv ices expected from lower layers ........................................................................

.................................. 30守

4.4 Functions ........................................................................

.................................................................................. 30守

5 Procedures ........................................................................

...................................................................... 31守

5.1 General ........................................................................

..................................................................................... 31守

5.1.1 Introduction...................................................................

.............................................................................. 31守

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

.......................................................... 32守

5.1.3 R equirements for UE in MR-DC ........................................................................

........................................ 32守

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

.................................................................. 33守

5.2.1 Introduction...................................................................

.............................................................................. 33守

5.2.2 S ystem information acquisition ........................................................................

.......................................... 34守

5.2.2.1 Gene ral UE requirements ........................................................................

.............................................. 34守

5.2.2.2 SIB va lidity and need to (re)-acquire SIB ........................................................................

..................... 34守

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

.............................................................. 34守

5.2.2.2.2 SI chang e indication and PWS notification ........................................................................

............. 35守

5.2.2.3 Ac quisition of System Information ........................................................................

............................... 36守

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

.................................... 36守

5.2.2.3.2 Ac quisition of an SI message ........................................................................

.................................. 37守

5.2.2.3.3 Re quest for on demand system information ........................................................................

............ 38守

5.2.2.3.3a Re quest for on demand positioning system information ................................................................. 39守

5.2.2.3.4 Ac tions related to transmission of

RRCSystemInfoRequest message .............................................. 39守

5.2.2.3.5 Re quest for on demand system information in RRC_CONNECTED ............................................. 40守

5.2.2.3.6 Ac tions related to transmission of

DedicatedSIBRequest message ................................................. 41守

5.2.2.4 Ac tions upon receipt of System Information ........................................................................

................ 41守

5.2.2.4.1 Ac tions upon reception of the MIB .......................................................................

........................... 41守

5.2.2.4.2 Ac tions upon reception of the SIB1 .......................................................................

.......................... 41守

5.2.2.4.3 Ac tions upon reception of SIB2 .......................................................................

................................ 45守

5.2.2.4.4 Ac tions upon reception of SIB3 .......................................................................

................................ 46守

5.2.2.4.5 Ac tions upon reception of SIB4 .......................................................................

................................ 46守

5.2.2.4.6 Ac tions upon reception of SIB5 .......................................................................

................................ 47守

5.2.2.4.7 Ac tions upon reception of SIB6 .......................................................................

................................ 47守

5.2.2.4.8 Ac tions upon reception of SIB7 .......................................................................

................................ 47守

5.2.2.4.9 Ac tions upon reception of SIB8 .......................................................................

................................ 47守

5.2.2.4.10 Actio ns upon reception of SIB9 .......................................................................

................................ 48守

5.2.2.4.11 Actio ns upon reception of SIB10 .......................................................................

.............................. 48守

5.2.2.4.12 Actio ns upon reception of SIB11 .......................................................................

.............................. 48守

5.2.2.4.13 Actio ns upon reception of SIB12 .......................................................................

.............................. 49守

5.2.2.4.14 Actio ns upon reception of SIB13 .......................................................................

.............................. 49守

5.2.2.4.15 Actio ns upon reception of SIB14 .......................................................................

.............................. 49守

5.2.2.4.16 Actio ns upon reception of SIBpos .......................................................................

............................ 49守

5.2.2.5 Ess ential system information missing ........................................................................

........................... 50守

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

................................................................... 50守

5.3.1 Introduction...................................................................

.............................................................................. 50守

5.3.1.1 RR C connection control ........................................................................

................................................ 50守

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

................................................................... 51守 ETSI ETSI TS 138 331 V16.1.0 (2020-07)43GPP TS 38.331 version 16.1.0 Release 16

5.3.2 Paging ........................................................................

................................................................................. 52守

5.3.2.1 General ........................................................................

.......................................................................... 52守

5.3.2.2 Initiation ........................................................................

........................................................................ 52守

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

................ 52守

5.3.3 R RC connection establishment ........................................................................

........................................... 53守

5.3.3.1 General ........................................................................

.......................................................................... 53守

5.3.3.1a Co nditions for establishing RRC Connection for sidelink communication .......................................... 53守

5.3.3.2 Initiation ........................................................................

........................................................................ 54守

5.3.3.3 Actions re lated to transmission of RRCSetupRequest message ............................................................. 54守

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

.......................... 55守

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

......................... 57守

5.3.3.6 Ce ll re-selection or cell selection while T390, T300 or T302 is running (UE in RRC_IDLE) ............. 57守

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

.................................................................... 57守

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

.................. 59守

5.3.4 In itial AS security activation ........................................................................

.............................................. 59守

5.3.4.1 General ........................................................................

.......................................................................... 59守

5.3.4.2 Initiation ........................................................................

........................................................................ 59守

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

.... 59守

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

.............................. 60守

5.3.5.1 General ........................................................................

.......................................................................... 60守

5.3.5.2 Initiation ........................................................................

........................................................................ 61守

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

.......... 62守

5.3.5.4 Second ary cell group release ........................................................................

......................................... 68守

5.3.5.5 Ce ll Group configuration ........................................................................

.............................................. 68守

5.3.5.5.1 General ........................................................................

.................................................................... 68守

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

....................................... 69守

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

.................................................. 71守

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

........................... 71守

5.3.5.5.5 MAC entit y configuration ........................................................................

....................................... 72守

5.3.5.5.6 RLF T imers & Constants configuration ........................................................................

.................. 72守

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

............................................... 73守

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

........................................................... 73守

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

................................... 73守

5.3.5.5.10 BH RLC ch annel release ........................................................................

......................................... 74守

5.3.5.5.11 BH R LC channel addition/modification ........................................................................

.................. 74守

5.3.5.6 Ra dio Bearer configuration ........................................................................

........................................... 75守

5.3.5.6.1 General ........................................................................

.................................................................... 75守

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

............................ 75守

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

...................................... 75守

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

............................................................. 77守

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

..................................... 77守

5.3.5.7 AS Secu rity key update ........................................................................

................................................. 80守

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

................................................. 81守

5.3.5.8.1 Void ........................................................................

......................................................................... 81守

5.3.5.8.2 Inabi lity to comply with RRCReconfiguration .......................................................................

......... 81守

5.3.5.8.3 T3 04 expiry (Reconfiguration with sync Failure) ........................................................................... 82守

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

....................................................... 84守

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

............................................................. 86守

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

.......................................................... 86守

5.3.5.12 BAP configuration ........................................................................

........................................................ 87守

5.3.5.12a IAB Other Configuration ........................................................................

.............................................. 88守

5.3.5.12a.1 IP address management ........................................................................

........................................... 88守

5.3.5.12a.1.1 IP Address Release ........................................................................

............................................ 88守

5.3.5.12a.1.2 IP Address Addition /Modification ........................................................................

..................... 88守

5.3.5.13 Conditional Reconfiguration ........................................................................

......................................... 89守

5.3.5.13.1 General ........................................................................

.................................................................... 89守

5.3.5.13.2 Con ditional reconfiguration removal ........................................................................

....................... 90守

5.3.5.13.3 Con ditional reconfiguration addition/modification ......................................................................... 90守

5.3.5.13.4 Con ditional reconfiguration evaluation ........................................................................

................... 90守

5.3.5.13.5 Con ditional reconfiguration execution ........................................................................

.................... 91守

5.3.5.14 Sidelink dedicated con figuration ........................................................................

................................... 91守

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

..................................................................... 92守 ETSI ETSI TS 138 331 V16.1.0 (2020-07)53GPP TS 38.331 version 16.1.0 Release 16

5.3.6.1 General ........................................................................

.......................................................................... 92守

5.3.6.2 Initiation ........................................................................

........................................................................ 92守

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

..... 93守

5.3.7 R RC connection re-establishment ........................................................................

....................................... 93守

5.3.7.1 General ........................................................................

.......................................................................... 93守

5.3.7.2 Initiation ........................................................................

........................................................................ 94守

5.3.7.3 Actio ns following cell selection while T311 is running ........................................................................ 96守

5.3.7.4 Actions re lated to transmission of RRCReestablishmentRequest message ........................................... 97守

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

......... 98守

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

.................................................................... 99守

5.3.7.7 T3 01 expiry or selected cell no longer suitable ................................................................................... 100守

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

........................ 100守

5.3.8 R RC connection release ........................................................................

.................................................... 100守

5.3.8.1 General ........................................................................

........................................................................ 100守

5.3.8.2 Initiation ........................................................................

...................................................................... 100守

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

.................... 100守

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

.................................................................. 103守

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

.... 103守

5.3.9 R RC connection release requested by upper layers ........................................................................

.......... 103守

5.3.9.1 General ........................................................................

........................................................................ 103守

5.3.9.2 Initiation ........................................................................

...................................................................... 103守

5.3.10 Ra dio link failure related actions ........................................................................

......................... 103守

5.3.10.1 Detection of phy sical layer problems in RRC_CONNECTED ........................................................... 103守

5.3.10.2 Recove ry of physical layer problems ........................................................................

.......................... 104守

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

..................................... 104守

5.3.10.4 RLF cause determination ........................................................................

............................................ 108守

5.3.10.5 RLF report cont ent determination ........................................................................

............................... 108守

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

.............................. 111守

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

................. 112守

5.3.13 RR C connection resume ........................................................................

................................................... 112守

5.3.13.1 General ........................................................................

........................................................................ 112守

5.3.13.1a Con ditions for resuming RRC Connection for sidelink communication ............................................. 113守

5.3.13.2 Initiation ........................................................................

...................................................................... 113守

5.3.13.3 Actions re lated to transmission of RRCResumeRequest or RRCResumeRequest1 message ............... 115守

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

.................... 116守

5.3.13.5 T319 ex piry or Integrity check failure from lower layers while T319 is running ............................... 119守

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

RRC_INACTIVE) ................................................................... ........................................................... 120

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

........................ 120守

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

................................................................. 120守

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

.................... 121守

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

....................... 121守

5.3.13.11 Inability to com ply with RRCResume .......................................................................

.......................... 121守

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

........................................... 121守

5.3.14 Uni fied Access Control ........................................................................

..................................................... 121守

5.3.14.1 General ........................................................................

........................................................................ 121守

5.3.14.2 Initiation ........................................................................

...................................................................... 122守

5.3.14.3 Void...................................................................

.................................................................................. 123守

5.3.14.4 T302, T390 expiry or stop (Barring alleviation) ................................................................................. 123守

5.3.14.5 Acces s barring check.......................................................................

.................................................... 124守

5.3.15 RR C connection reject ........................................................................

...................................................... 124守

5.3.15.1 Initiation ........................................................................

...................................................................... 124守

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

....................... 124守

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

.................................................................. 125守

5.4.1 Introduction...................................................................

............................................................................ 125守

5.4.2 Han dover to NR ........................................................................

................................................................ 125守

5.4.2.1 General ........................................................................

........................................................................ 125守

5.4.2.2 Initiation ........................................................................

...................................................................... 126守

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

....... 126守

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

............................................................. 126守

5.4.3.1 General ........................................................................

........................................................................ 126守

5.4.3.2 Initiation ........................................................................

...................................................................... 127守 ETSI ETSI TS 138 331 V16.1.0 (2020-07)63GPP TS 38.331 version 16.1.0 Release 16

5.4.3.3 Reception of the MobilityFromNRCommand by the UE..................................................................... 127守

5.4.3.4 Succes sful completion of the mobility from NR ........................................................................

......... 127守

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

...................... 128守

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

......................................................................... 128守

5.5.1 Introduction...................................................................

............................................................................ 128守

5.5.2 Measurement configuration ........................................................................

.............................................. 131守

5.5.2.1 General ........................................................................

........................................................................ 131守

5.5.2.2 Measu rement identity removal ........................................................................

.................. 132守

5.5.2.3 Measu rement identity addition/modification ........................................................................

.............. 132守

5.5.2.4 Measu rement object removal ........................................................................

...................................... 133守

5.5.2.5 Measur ement object addition/modification ........................................................................

................. 134守

5.5.2.6 Re porting configuration removal ........................................................................

................................ 135守

5.5.2.7 Re porting configuration addition/modification ........................................................................

........... 136守

5.5.2.8 Quantity configuration ........................................................................

................................................ 136守

5.5.2.9 Measu rement gap configuration ........................................................................

.................................. 136守

5.5.2.10 Re ference signal measurement timing configuration .......................................................................... 138守

5.5.2.10a RSSI measurement timing configuration ........................................................................

.................... 138守

5.5.2.11 Measu rement gap sharing configuration ........................................................................

..................... 139守

5.5.3 Performing measurements ........................................................................

................................................ 139守

5.5.3.1 General ........................................................................

........................................................................ 139守

5.5.3.2 La yer 3 filtering ........................................................................

.......................................................... 143守

5.5.3.3 Deriva tion of cell measurement results ........................................................................

....................... 144守

5.5.3.3a Deriva tion of layer 3 beam filtered measurement ............................................................................... 145守

5.5.4 Meas urement report triggering ........................................................................

......................................... 145守

5.5.4.1 General ........................................................................

........................................................................ 145守

5.5.4.2 Even t A1 (Serving becomes better than threshold) ............................................................................. 150守

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