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