Content for TR 36.842 Word version: 12.0.0
2 References
3 Definitions and abbreviations
4 Introduction
5 Deployment scenarios and challenges
6 Design goals
7 Potential solutions
8 Architecture and protocol enhancements
9 Conclusions
A Performance evaluation
B Mobility and simulation assumptions for mobility evaluation in Scenario #2 (subclause 5.2.3)
C Simulation assumptions for mobility evaluation in Scenario #3 (subclause 5.3.1)
D Simulation assumptions for performance evaluation of inter-node radio resource aggregation (subclause 7.1.1.1)
E Simulation assumptions for mobility robustness in Scenario #2 (subclause 5.2.1)
F Simulation assumptions for performance evaluation of U-plane data split Option 3 (subclause 8.1.11.1)
G Signalling flow for dual connectivity operation
$ Change history
2 References p. 5
3 Definitions and abbreviations p. 7
3.1 Definitions p. 7
3.2 Abbreviations p. 7
4 Introduction p. 7
5 Deployment scenarios and challenges p. 8
5.1 Scenario #1 p. 8
5.1.1 Mobility robustness p. 8
5.1.2 UL/DL imbalance between macro and small cells p. 8
5.1.3 Increased signalling load (e.g., to CN) due to frequent handover p. 9
5.1.4 Difficult to improve per-user throughput by utilizing radio resources in more than one eNB p. 11
5.1.5 Network planning and configuration effort p. 11
5.2 Scenario #2 p. 12
5.2.1 Mobility robustness p. 12
5.2.2 UL/DL imbalance between macro and small cells p. 14
5.2.3 Increased signalling load (e.g., to CN) due to frequent handover p. 14
5.2.4 Difficult to improve per-user throughput by utilizing radio resources in more than one eNB p. 16
5.3 Scenario #3 p. 16
6 Design goals p. 18
7 Potential solutions p. 18
7.1 Dual connectivity p. 19
7.1.1 Inter-node radio resource aggregation (for Scenario #2) p. 19
7.1.2 Inter-node radio resource aggregation (for Scenario #1) p. 23
7.1.3 RRC diversity p. 24
7.1.3.1 Analysis of technology potential for Scenario #1 p. 26
7.1.3.2 Analysis of technology potential for Scenario #2 p. 32
7.1.4 UL/DL split p. 33
7.1.4.1 Architecture alternatives for UL/DL split p. 34
7.1.4.2 Analysis of technology potential p. 35
7.1.5 CA+eICIC for Scenario #2 p. 35
7.2 Mobility anchor p. 36
8 Architecture and protocol enhancements p. 37
8.1 Architecture and protocol enhancements for Dual connectivity p. 37
8.1.1 User plane architecture for dual connectivity p. 37
8.1.1.1 Alternative 1A p. 38
8.1.1.2 Alternative 2A p. 39
8.1.1.3 Alternative 2B p. 39
8.1.1.4 Alternative 2C p. 40
8.1.1.5 Alternative 2D p. 40
8.1.1.6 Alternative 3A p. 41
8.1.1.7 Alternative 3B p. 42
8.1.1.8 Alternative 3C p. 42
8.1.1.9 Alternative 3D p. 43
8.1.1.10 Comparison of use plane architecture alternatives p. 44
8.1.1.11 Performance evaluation of use plane architecture alternatives p. 47
8.1.1.12 Interconnecting eNBs via X2 for dual connectivity specific U-plane data transmission p. 50
8.1.2 Details of user plane features p. 50
8.1.2.1 Random Access procedure p. 50
8.1.2.2 Buffer Status Reporting p. 50
8.1.2.3 Discontinuous Reception (DRX) p. 50
8.1.2.4 Activation/Deactivation p. 50
8.1.2.5 Number of MAC entities p. 50
8.1.3 Control plane architecture for dual connectivity p. 50
8.1.3.1 RRC Protocol architecture p. 51
8.1.3.2 RRC procedures p. 51
8.1.3.3 Performance evaluation of CP alternatives p. 52
8.1.3.4 Interconnecting eNBs via X2 for dual connectivity specific RNL signalling p. 52
8.1.4 Details of control plane features p. 53
8.1.5 Xn interface assumptions p. 53
8.1.6 Overall architecture p. 53
8.2 General frameworks for dual connectivity p. 53
9 Conclusions p. 55
A Performance evaluation p. 56
B Mobility and simulation assumptions for mobility evaluation in Scenario #2 (subclause 5.2.3) p. 57
B.1 Mobility assumptions p. 57
B.2 Simulation assumptions p. 58
C Simulation assumptions for mobility evaluation in Scenario #3 (subclause 5.3.1) p. 59
C.1 Scenarios and main assumptions p. 59
C.2 Modelling of realistic cell detection p. 60
C.3 Simulation assumptions p. 61
D Simulation assumptions for performance evaluation of inter-node radio resource aggregation (subclause 7.1.1.1) p. 62
E Simulation assumptions for mobility robustness in Scenario #2 (subclause 5.2.1) p. 64
F Simulation assumptions for performance evaluation of U-plane data split Option 3 (subclause 8.1.11.1) p. 67
G Signalling flow for dual connectivity operation p. 68
$ Change history p. 71
