5G; NR; Overall description; Stage-2 (3GPP TS 38.300 version 15.8.0 Release 15)

RTS/TSGR-0238300vf80

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Status
Published
Publication Date
16-Jan-2020
Current Stage
12 - Completion
Completion Date
17-Jan-2020
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ETSI TS 138 300 V15.8.0 (2020-01) - 5G; NR; Overall description; Stage-2 (3GPP TS 38.300 version 15.8.0 Release 15)
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ETSI TS 138 300 V15.8.0 (2020-01)
TECHNICAL SPECIFICATION
5G;
NR;
Overall description;
Stage-2
(3GPP TS 38.300 version 15.8.0 Release 15)
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3GPP TS 38.300 version 15.8.0 Release 15 1 ETSI TS 138 300 V15.8.0 (2020-01)
Reference
RTS/TSGR-0238300vf80
Keywords
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3GPP TS 38.300 version 15.8.0 Release 15 2 ETSI TS 138 300 V15.8.0 (2020-01)
Intellectual Property Rights
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pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found

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Legal Notice

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ETSI
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3GPP TS 38.300 version 15.8.0 Release 15 3 ETSI TS 138 300 V15.8.0 (2020-01)
Contents

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

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

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

Foreword ............................................................................................................................................................. 7

1 Scope ........................................................................................................................................................ 8

2 References ................................................................................................................................................ 8

3 Abbreviations and Definitions .................................................................................................................. 9

3.1 Abbreviations ..................................................................................................................................................... 9

3.2 Definitions ........................................................................................................................................................ 11

4 Overall Architecture and Functional Split .............................................................................................. 11

4.1 Overall Architecture ......................................................................................................................................... 11

4.2 Functional Split ................................................................................................................................................ 12

4.3 Network Interfaces ........................................................................................................................................... 14

4.3.1 NG Interface ............................................................................................................................................... 14

4.3.1.1 NG User Plane ...................................................................................................................................... 14

4.3.1.2 NG Control Plane .................................................................................................................................. 14

4.3.2 Xn Interface ................................................................................................................................................ 15

4.3.2.1 Xn User Plane ....................................................................................................................................... 15

4.3.2.2 Xn Control Plane ................................................................................................................................... 16

4.4 Radio Protocol Architecture ............................................................................................................................. 16

4.4.1 User Plane ................................................................................................................................................... 16

4.4.2 Control Plane .............................................................................................................................................. 17

4.5 Multi-Radio Dual Connectivity ........................................................................................................................ 17

4.6 Radio Access Network Sharing ........................................................................................................................ 17

5 Physical Layer ........................................................................................................................................ 17

5.1 Waveform, numerology and frame structure .................................................................................................... 17

5.2 Downlink .......................................................................................................................................................... 18

5.2.1 Downlink transmission scheme .................................................................................................................. 18

5.2.2 Physical-layer processing for physical downlink shared channel ............................................................... 19

5.2.3 Physical downlink control channels ............................................................................................................ 19

5.2.4 Synchronization signal and PBCH block .................................................................................................... 20

5.2.5 Physical layer procedures ........................................................................................................................... 21

5.2.5.1 Link adaptation ..................................................................................................................................... 21

5.2.5.2 Power Control ....................................................................................................................................... 21

5.2.5.3 Cell search ............................................................................................................................................. 21

5.2.5.4 HARQ ................................................................................................................................................... 21

5.2.5.5 Reception of SIB1 ................................................................................................................................. 21

5.3 Uplink ............................................................................................................................................................... 21

5.3.1 Uplink transmission scheme ....................................................................................................................... 21

5.3.2 Physical-layer processing for physical uplink shared channel .................................................................... 22

5.3.3 Physical uplink control channel .................................................................................................................. 22

5.3.4 Random access ............................................................................................................................................ 23

5.3.5 Physical layer procedures ........................................................................................................................... 23

5.3.5.1 Link adaptation ..................................................................................................................................... 23

5.3.5.2 Uplink Power control ............................................................................................................................ 24

5.3.5.3 Uplink timing control ............................................................................................................................ 24

5.3.5.4 HARQ ................................................................................................................................................... 24

5.4 Carrier aggregation ........................................................................................................................................... 24

5.4.1 Carrier aggregation ..................................................................................................................................... 24

5.4.2 Supplementary Uplink ................................................................................................................................ 24

5.5 Transport Channels........................................................................................................................................... 24

6 Layer 2 .................................................................................................................................................... 25

ETSI
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3GPP TS 38.300 version 15.8.0 Release 15 4 ETSI TS 138 300 V15.8.0 (2020-01)

6.1 Overview .......................................................................................................................................................... 25

6.2 MAC Sublayer .................................................................................................................................................. 27

6.2.1 Services and Functions ............................................................................................................................... 27

6.2.2 Logical Channels ........................................................................................................................................ 28

6.2.3 Mapping to Transport Channels.................................................................................................................. 28

6.2.4 HARQ ......................................................................................................................................................... 28

6.3 RLC Sublayer ................................................................................................................................................... 28

6.3.1 Transmission Modes ................................................................................................................................... 28

6.3.2 Services and Functions ............................................................................................................................... 29

6.3.3 ARQ ............................................................................................................................................................ 29

6.4 PDCP Sublayer ................................................................................................................................................. 29

6.4.1 Services and Functions ............................................................................................................................... 29

6.5 SDAP Sublayer ................................................................................................................................................ 30

6.6 L2 Data Flow .................................................................................................................................................... 30

6.7 Carrier Aggregation .......................................................................................................................................... 30

6.8 Dual Connectivity............................................................................................................................................. 32

6.9 Supplementary Uplink ...................................................................................................................................... 32

6.10 Bandwidth Adaptation ...................................................................................................................................... 32

7 RRC ........................................................................................................................................................ 33

7.1 Services and Functions ..................................................................................................................................... 33

7.2 Protocol States .................................................................................................................................................. 34

7.3 System Information Handling .......................................................................................................................... 34

7.3.1 Overview .................................................................................................................................................... 34

7.3.2 Scheduling .................................................................................................................................................. 36

7.3.3 SI Modification ........................................................................................................................................... 36

7.4 Access Control ................................................................................................................................................. 36

7.5 UE Capability Retrieval framework ................................................................................................................. 36

7.6 Transport of NAS Messages ............................................................................................................................. 37

7.7 Carrier Aggregation .......................................................................................................................................... 37

7.8 Bandwidth Adaptation ...................................................................................................................................... 37

7.9 UE Assistance Information............................................................................................................................... 37

8 NG Identities .......................................................................................................................................... 38

8.1 UE Identities ..................................................................................................................................................... 38

8.2 Network Identities ............................................................................................................................................ 38

8.3 User Data Transport on the CN-RAN Interface ............................................................................................... 39

9 Mobility and State Transitions ............................................................................................................... 39

9.1 Overview .......................................................................................................................................................... 39

9.2 Intra-NR ........................................................................................................................................................... 40

9.2.1 Mobility in RRC_IDLE .............................................................................................................................. 40

9.2.1.1 Cell Selection ........................................................................................................................................ 40

9.2.1.2 Cell Reselection .................................................................................................................................... 40

9.2.1.3 State Transitions .................................................................................................................................... 41

9.2.2 Mobility in RRC_INACTIVE..................................................................................................................... 42

9.2.2.1 Overview ............................................................................................................................................... 42

9.2.2.2 Cell Reselection .................................................................................................................................... 43

9.2.2.3 RAN-Based Notification Area .............................................................................................................. 43

9.2.2.4 State Transitions .................................................................................................................................... 44

9.2.2.4.1 UE triggered transition from RRC_INACTIVE to RRC_CONNECTED ....................................... 44

9.2.2.4.2 Network triggered transition from RRC_INACTIVE to RRC_CONNECTED .............................. 46

9.2.2.5 RNA update........................................................................................................................................... 46

9.2.3 Mobility in RRC_CONNECTED ............................................................................................................... 48

9.2.3.1 Overview ............................................................................................................................................... 48

9.2.3.2 Handover ............................................................................................................................................... 49

9.2.3.2.1 C-Plane Handling ............................................................................................................................ 49

9.2.3.2.2 U-Plane Handling ............................................................................................................................ 51

9.2.3.2.3 Data Forwarding .............................................................................................................................. 52

9.2.3.3 Re-establishment procedure .................................................................................................................. 54

9.2.4 Measurements ............................................................................................................................................. 55

9.2.5 Paging ......................................................................................................................................................... 57

9.2.6 Random Access Procedure ......................................................................................................................... 58

ETSI
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3GPP TS 38.300 version 15.8.0 Release 15 5 ETSI TS 138 300 V15.8.0 (2020-01)

9.2.7 Radio Link Failure ...................................................................................................................................... 59

9.2.8 Beam failure detection and recovery .......................................................................................................... 59

9.2.9 Timing Advance ......................................................................................................................................... 59

9.3 Inter RAT ......................................................................................................................................................... 60

9.3.1 Intra 5GC .................................................................................................................................................... 60

9.3.1.1 Cell Reselection .................................................................................................................................... 60

9.3.1.2 Handover ............................................................................................................................................... 60

9.3.1.3 Measurements ....................................................................................................................................... 60

9.3.2 From 5GC to EPC ....................................................................................................................................... 61

9.3.2.1 Cell Reselection .................................................................................................................................... 61

9.3.2.2 Handover and redirection ...................................................................................................................... 61

9.3.2.3 Measurements ....................................................................................................................................... 61

9.3.2.4 Data Forwarding for the Control Plane ................................................................................................. 61

9.3.2.5 Data Forwarding for the User Plane ...................................................................................................... 61

9.3.3 From EPC to 5GC ....................................................................................................................................... 62

9.3.3.1 Data Forwarding for the Control Plane ................................................................................................. 62

9.3.3.2 Data Forwarding for the User Plane ...................................................................................................... 62

9.4 Roaming and Access Restrictions .................................................................................................................... 63

10 Scheduling .............................................................................................................................................. 63

10.1 Basic Scheduler Operation ............................................................................................................................... 63

10.2 Downlink Scheduling ....................................................................................................................................... 63

10.3 Uplink Scheduling ............................................................................................................................................ 64

10.4 Measurements to Support Scheduler Operation ............................................................................................... 64

10.5 Rate Control ..................................................................................................................................................... 65

10.5.1 Downlink .................................................................................................................................................... 65

10.5.2 Uplink ......................................................................................................................................................... 65

10.6 Activation/Deactivation Mechanism ................................................................................................................ 65

10.7 E-UTRA-NR Cell Resource Coordination ....................................................................................................... 66

10.8 Cross Carrier Scheduling .................................................................................................................................. 66

11 UE Power Saving ................................................................................................................................... 66

12 QoS ......................................................................................................................................................... 67

12.1 Overview .......................................................................................................................................................... 67

12.2 Explicit Congestion Notification ...................................................................................................................... 69

13 Security................................................................................................................................................... 70

13.1 Overview and Principles .................................................................................................................................. 70

13.2 Security Termination Points ............................................................................................................................. 72

13.3 State Transitions and Mobility ......................................................................................................................... 72

14 UE Capabilities ...................................................................................................................................... 72

15 Self-Configuration and Self-Optimisation ............................................................................................. 73

15.1 Definitions ........................................................................................................................................................ 73

15.2 Void .................................................................................................................................................................. 73

15.3 Self-configuration ............................................................................................................................................. 73

15.3.1 Dynamic
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