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TR 36.839
E-UTRA – Mobility enhancements in Heterogeneous Networks

3GPP‑Page
V11.1.0 (Wzip)  2013/01  53 p.
Rapporteur:
Dr. Palat, Sudeep

full Table of Contents for  TR 36.839  Word version:  11.1.0

1Scope  p. 5
2References  p. 5
3Definitions, symbols and abbreviations  p. 6
3.1Definitions  p. 6
3.2Symbols  p. 6
3.3Abbreviations  p. 7
4General  p. 7
5HetNet mobility performance evaluation  p. 7
5.1Simulation study phases  p. 7
5.2General Simulation assumptions  p. 8
5.2.1Handover Failure Modelling  p. 8
5.2.1.1Definition of Handover states  p. 8
5.2.1.2RLF modelling and definition of RLF states  p. 8
5.2.1.3Handover/PDCCH failure modelling  p. 8
5.2.2Ping-pong Modelling  p. 11
5.2.3Typical Radio Parameter Configurations  p. 12
5.2.4HetNet mobility specific parameters  p. 13
5.2.5Modelling of additional features  p. 14
5.3Specific assumptions for Hotspot simulation  p. 14
5.3.1UE Placement and Trajectories for hotspot simulation  p. 14
5.3.2Additional Simulation assumptions for Hotspot calibration  p. 15
5.4Additional assumptions for large area system simulations  p. 15
5.4.1Improved HO failure and RLF modelling  p. 15
5.4.2Handover performance metrics for HetNet large area evaluation  p. 16
5.4.3The Definition of Short-ToS Rate  p. 17
5.4.4UE Placement and Trajectories and cell placement for large area simulation  p. 17
5.4.5Additional Simulation assumptions for Large area calibration  p. 18
5.4.5.1UE Placement and Trajectories and cell placement for large area simulation calibration  p. 18
5.5Simulation results  p. 19
5.5.1Hotspot calibration  p. 19
5.5.1.1RLF results discussion  p. 19
5.5.1.2HO failures results discussion  p. 21
5.5.1.3Ping-pong results discussion  p. 23
5.5.2Large area calibration  p. 23
5.5.2.1RLF performance for HetNet and legacy systems  p. 24
5.5.2.2Handover failure performance for HetNet and legacy systems  p. 25
5.5.2.3Short Time of Stay performance  p. 26
5.5.3Overall observations from calibration simulations  p. 28
5.5.4Multiple picocell deployments  p. 28
5.5.4.1Multiple picocell deployment under full system load  p. 28
5.5.4.1.1Observations from Multiple picocell deployment simulations under full system load  p. 30
5.5.4.2Multiple picocell deployment under constant system load  p. 30
5.5.4.2.1Observations from Multiple picocell deployment simulations under constant system load  p. 30
5.5.5Performance with DRX  p. 30
5.5.5.1Simulation study for Handover and RLF performance with DRX for HetNet relative to macro only systems  p. 30
5.5.5.1.1Simulation assumptions and definitions  p. 30
5.5.5.1.2Simulation results with DRX for HetNet relative to macro only systems  p. 31
5.5.5.2Simulation study for Handover and RLF performance with DRX for different HO types in HetNet  p. 33
5.5.5.2.1Simulation assumptions and definitions  p. 33
5.5.5.2.2Simulation results with DRX for different HO types in HetNet  p. 36
5.5.5.3Overall observations on Handover performance in HetNet with DRX  p. 38
5.5.6Performance with eICIC  p. 38
5.5.6.1Simulation assumptions  p. 39
5.5.6.2Simulation results  p. 39
5.5.6.3Conclusions on mobility performance with eICIC  p. 42
5.6Performance benefits of enhanced UE mobility state estimation  p. 42
5.6.1Mobility speed estimation  p. 42
5.6.2Overall observations on Mobility speed estimation  p. 44
6Strategies for improved small cell discovery/identification  p. 44
6.1Deployment scenarios  p. 44
6.2Objectives for inter-frequency small cell measurements  p. 45
6.3Analysis of existing inter-frequency measurements  p. 45
6.4Potential enhancements for improved small cell discovery/identification  p. 46
6.4.1Solution 1: Longer measurement period [20]  p. 46
6.4.3Solution 9: UE MSE based measurements [21,32]  p. 46
6.4.4Solution 10: Small cell signal based control of measurements [22]  p. 46
6.4.5Solution 4: Measurements without gap assistance [23]  p. 46
6.4.6Solution 2: Small cell discovery signal in macro layer [24]  p. 46
6.4.7Solution 6: UE based proximity detection [25, 33]  p. 46
6.4.8Solution 5/ 7: Proximity detection based on macro/pico cell listening [26, 27]  p. 46
6.4.9Solution 8: Proximity detection with broadcast assistance [28, 33]  p. 47
6.5Evaluation results  p. 47
7Automatic Re-establishment procedures for mobility robustness  p. 48
8Mobility enhancements for Multi-Carrier (including CA) in HeNBs with potentially different CSGs  p. 48
9Overall observations from the study on HetNet mobility  p. 48
ADetailed evaluation results on potential enhancements for inter-frequency small cell measurements  p. 50
$Change history  p. 53

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