Content for TR 38.801 Word version: 14.0.0
2 References
3 Definitions and abbreviations
4 Objectives and requirements
5 Deployment scenarios
6 Overall New RAN architecture
7 RAN Architecture and Interfaces
8 Realization of Network Slicing
9 QoS
10 Radio access network procedures
2 References p. 8
3 Definitions and abbreviations p. 9
3.1 Definitions p. 9
3.2 Abbreviations p. 9
4 Objectives and requirements p. 9
5 Deployment scenarios p. 10
5.1 General p. 10
5.2 Non-centralised deployment p. 10
5.3 Co-sited deployment with E-UTRA p. 11
5.4 Centralized deployment p. 11
5.5 Shared RAN deployment p. 12
6 Overall New RAN architecture p. 12
7 RAN Architecture and Interfaces p. 14
7.1 New RAN Architecture p. 14
7.2 5G Architecture Options p. 14
7.3 RAN-CN interface p. 16
7.3.1 RAN-CN interface connectivity scenarios p. 16
7.3.2 General principles p. 16
7.3.3 NG Interface Functions p. 17
7.3.4 NG Interface Procedures p. 17
7.3.4.1 General p. 17
7.3.4.2 NG Interface Procedures Descriptions p. 19
7.3.4.2.1 General p. 19
7.3.4.2.2 Interface Management Procedures p. 19
7.3.4.2.3 UE Context Management Procedures p. 20
7.3.4.2.4 Transport of NAS Messages Procedures p. 21
7.3.4.2.5 UE Mobility Management Procedures p. 22
7.3.4.2.6 Paging Procedure p. 24
7.3.4.3 Potential NG Enhancements p. 24
7.3.5 NG interface architecture p. 24
7.3.6 NG Control Plane p. 24
7.3.7 NG User Plane p. 25
7.4 RAN internal interface p. 26
7.4.1 Xn Interface p. 26
7.4.1.1 General p. 26
7.4.1.2 General principles p. 26
7.4.1.3 Xn Interface Functions p. 26
7.4.1.4 Xn Interface Procedures p. 27
7.4.1.5 Xn Control Plane p. 28
7.4.1.6 Xn User Plane p. 28
8 Realization of Network Slicing p. 29
8.1 Key principles for support of Network Slicing in RAN p. 29
8.2 Solutions for selection of Network slice and CN entity by gNB p. 30
8.3 Resource Isolation between slices p. 37
8.4 Resource management between slices p. 37
8.5 Mobility p. 37
8.5.1 General p. 37
8.5.2 Connected Mode Mobility p. 38
8.6 Validation of the UE rights to access a NW slice p. 38
8.7 Granularity of slice awareness p. 38
8.8 Impacts on RAN signalling p. 39
9 QoS p. 40
9.1 Key principles for QoS in RAN p. 40
9.2 Uplink QoS marking p. 42
9.3 QoS impact on handover procedure p. 43
10 Radio access network procedures p. 43
10.1 Dual Connectivity between NR and LTE p. 43
10.1.1 General p. 43
10.1.2 Option 3/3a/3x p. 43
10.1.2.1 General principles for Xx interface p. 43
10.1.2.2 Architectural aspects p. 44
10.1.2.3 Procedural aspects p. 45
10.1.2.4 SCG split bearer p. 46
10.1.2.5 QoS aspect p. 47
10.1.2.6 General principles for S1 interface p. 48
10.1.2.7 Xx interface protocols p. 48
10.1.2.8 TNL address discovery for Xx interface establishment p. 48
10.1.3 Option 4/4a p. 48
10.1.4 Option 7/7a/7x p. 49
10.2 New RAN operation p. 51
10.2.1 Intra-system Mobility p. 51
10.2.1.1 General p. 51
10.2.1.2 Intra-system Intra-RAT mobility p. 52
10.2.1.2.1 Scenario: Inter gNB mobility p. 52
10.2.1.2.2 Inter-gNB Handover Variant with in-band Path Switch p. 52
10.2.1.3 Intra-system Inter-RAT handover with E-UTRA p. 53
10.2.1.4 Cell Reselection, Release and Redirection p. 54
10.2.2 Inter-system Mobility p. 54
10.2.2.1 Inter-system Inter-RAT handover with E-UTRA p. 54
10.2.2.2 Inter-system intra-RAT handover p. 55
10.2.3 PDU Session Management p. 55
10.2.4 Initial UE Access p. 57
10.2.5 Intra-NR dual connectivity p. 58
