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TR 36.842
Study on
Small Cell enhancements for E-UTRA and E-UTRAN –
Higher Layer aspects

3GPP‑Page
V12.0.0 (Wzip)  2014/01  71 p.
Rapporteur:
Mr. Takahashi, Hideaki

full Table of Contents for  TR 36.842  Word version:  12.0.0

1Scope  p. 5
2References  p. 5
3Definitions and abbreviations  p. 7
3.1Definitions  p. 7
3.2Abbreviations  p. 7
4Introduction  p. 7
5Deployment scenarios and challenges  p. 8
5.1Scenario #1  p. 8
5.1.1Mobility robustness  p. 8
5.1.2UL/DL imbalance between macro and small cells  p. 8
5.1.3Increased signalling load (e.g., to CN) due to frequent handover  p. 9
5.1.4Difficult to improve per-user throughput by utilizing radio resources in more than one eNB  p. 11
5.1.5Network planning and configuration effort  p. 11
5.2Scenario #2  p. 12
5.2.1Mobility robustness  p. 12
5.2.2UL/DL imbalance between macro and small cells  p. 14
5.2.3Increased signalling load (e.g., to CN) due to frequent handover  p. 14
5.2.4Difficult to improve per-user throughput by utilizing radio resources in more than one eNB  p. 16
5.3Scenario #3  p. 16
5.3.1Mobility robustness  p. 17
5.3.2Increased signalling load (e.g., to CN) due to frequent handover  p. 18
6Design goals  p. 18
7Potential solutions  p. 18
7.1Dual connectivity  p. 19
7.1.1Inter-node radio resource aggregation (for Scenario #2)  p. 19
7.1.1.1Analysis of technology potential  p. 19
7.1.1.1.1Potential gain from the existing features  p. 19
7.1.1.1.2Potential gain with non-ideal backhaul deployments  p. 22
7.1.2Inter-node radio resource aggregation (for Scenario #1)  p. 23
7.1.2.1Analysis of technology potential  p. 24
7.1.3RRC diversity  p. 24
7.1.3.1Analysis of technology potential for Scenario #1  p. 26
7.1.3.2Analysis of technology potential for Scenario #2  p. 32
7.1.4UL/DL split  p. 33
7.1.4.1Architecture alternatives for UL/DL split  p. 34
7.1.4.2Analysis of technology potential  p. 35
7.1.5CA+eICIC for Scenario #2  p. 35
7.1.5.1Analylsis of technology potential  p. 35
7.2Mobility anchor  p. 36
8Architecture and protocol enhancements  p. 37
8.1Architecture and protocol enhancements for Dual connectivity  p. 37
8.1.1User plane architecture for dual connectivity  p. 37
8.1.1.1Alternative 1A  p. 38
8.1.1.2Alternative 2A  p. 39
8.1.1.3Alternative 2B  p. 39
8.1.1.4Alternative 2C  p. 40
8.1.1.5Alternative 2D  p. 40
8.1.1.6Alternative 3A  p. 41
8.1.1.7Alternative 3B  p. 42
8.1.1.8Alternative 3C  p. 42
8.1.1.9Alternative 3D  p. 43
8.1.1.10Comparison of use plane architecture alternatives  p. 44
8.1.1.11Performance evaluation of use plane architecture alternatives  p. 47
8.1.1.12Interconnecting eNBs via X2 for dual connectivity specific U-plane data transmission  p. 50
8.1.1.12.1X2 User plane functions  p. 50
8.1.2Details of user plane features  p. 50
8.1.2.1Random Access procedure  p. 50
8.1.2.2Buffer Status Reporting  p. 50
8.1.2.3Discontinuous Reception (DRX)  p. 50
8.1.2.4Activation/Deactivation  p. 50
8.1.2.5Number of MAC entities  p. 50
8.1.3Control plane architecture for dual connectivity  p. 50
8.1.3.1RRC Protocol architecture  p. 51
8.1.3.2RRC procedures  p. 51
8.1.3.3Performance evaluation of CP alternatives  p. 52
8.1.3.4Interconnecting eNBs via X2 for dual connectivity specific RNL signalling  p. 52
8.1.3.4.1X2 Control plane functions  p. 52
8.1.4Details of control plane features  p. 53
8.1.4.1Signalling flows and procedures  p. 53
8.1.4.2Transmission of RRC messages  p. 53
8.1.5Xn interface assumptions  p. 53
8.1.6Overall architecture  p. 53
8.2General frameworks for dual connectivity  p. 53
8.2.1PCell functionality in SCG  p. 54
8.2.2Bearer split modelling  p. 54
9Conclusions  p. 55
APerformance evaluation  p. 56
BMobility and simulation assumptions for mobility evaluation in Scenario #2 (subclause 5.2.3)  p. 57
B.1Mobility assumptions  p. 57
B.2Simulation assumptions  p. 58
CSimulation assumptions for mobility evaluation in Scenario #3 (subclause 5.3.1)  p. 59
C.1Scenarios and main assumptions  p. 59
C.2Modelling of realistic cell detection  p. 60
C.3Simulation assumptions  p. 61
DSimulation assumptions for performance evaluation of inter-node radio resource aggregation (subclause 7.1.1.1)  p. 62
ESimulation assumptions for mobility robustness in Scenario #2 (subclause 5.2.1)  p. 64
E.1Simulation assumptions without DRX  p. 64
E.2Simulation assumptions with DRX  p. 65
FSimulation assumptions for performance evaluation of U-plane data split Option 3 (subclause 8.1.11.1)  p. 67
GSignalling flow for dual connectivity operation  p. 68
G.1SeNB Addition/Modification  p. 68
G.2SeNB release (MeNB initiated)  p. 69
$Change history  p. 71

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