Content for TR 36.839 Word version: 11.1.0
2 References
3 Definitions, symbols and abbreviations
4 General
5 HetNet mobility performance evaluation
6 Strategies for improved small cell discovery/identification
7 Automatic Re-establishment procedures for mobility robustness
8 Mobility enhancements for Multi-Carrier (including CA) in HeNBs with potentially different CSGs
9 Overall observations from the study on HetNet mobility
A Detailed evaluation results on potential enhancements for inter-frequency small cell measurements
$ Change history
2 References p. 5
3 Definitions, symbols and abbreviations p. 6
4 General p. 7
5 HetNet mobility performance evaluation p. 7
5.1 Simulation study phases p. 7
5.2 General Simulation assumptions p. 8
5.2.1 Handover Failure Modelling p. 8
5.2.1.1 Definition of Handover states p. 8
5.2.1.2 RLF modelling and definition of RLF states p. 8
5.2.1.3 Handover/PDCCH failure modelling p. 8
5.2.2 Ping-pong Modelling p. 11
5.2.3 Typical Radio Parameter Configurations p. 12
5.2.4 HetNet mobility specific parameters p. 13
5.2.5 Modelling of additional features p. 14
5.3 Specific assumptions for Hotspot simulation p. 14
5.3.1 UE Placement and Trajectories for hotspot simulation p. 14
5.3.2 Additional Simulation assumptions for Hotspot calibration p. 15
5.4 Additional assumptions for large area system simulations p. 15
5.4.1 Improved HO failure and RLF modelling p. 15
5.4.2 Handover performance metrics for HetNet large area evaluation p. 16
5.4.3 The Definition of Short-ToS Rate p. 17
5.4.4 UE Placement and Trajectories and cell placement for large area simulation p. 17
5.4.5 Additional Simulation assumptions for Large area calibration p. 18
5.5 Simulation results p. 19
5.5.1 Hotspot calibration p. 19
5.5.1.1 RLF results discussion p. 19
5.5.1.2 HO failures results discussion p. 21
5.5.1.3 Ping-pong results discussion p. 23
5.5.2 Large area calibration p. 23
5.5.2.1 RLF performance for HetNet and legacy systems p. 24
5.5.2.2 Handover failure performance for HetNet and legacy systems p. 25
5.5.2.3 Short Time of Stay performance p. 26
5.5.3 Overall observations from calibration simulations p. 28
5.5.4 Multiple picocell deployments p. 28
5.5.4.1 Multiple picocell deployment under full system load p. 28
5.5.4.2 Multiple picocell deployment under constant system load p. 30
5.5.5 Performance with DRX p. 30
5.5.5.1 Simulation study for Handover and RLF performance with DRX for HetNet relative to macro only systems p. 30
5.5.5.1.1 Simulation assumptions and definitions p. 30
5.5.5.1.2 Simulation results with DRX for HetNet relative to macro only systems p. 31
5.5.5.2 Simulation study for Handover and RLF performance with DRX for different HO types in HetNet p. 33
5.5.5.2.1 Simulation assumptions and definitions p. 33
5.5.5.2.2 Simulation results with DRX for different HO types in HetNet p. 36
5.5.5.3 Overall observations on Handover performance in HetNet with DRX p. 38
5.5.6 Performance with eICIC p. 38
5.6 Performance benefits of enhanced UE mobility state estimation p. 42
6 Strategies for improved small cell discovery/identification p. 44
6.1 Deployment scenarios p. 44
6.2 Objectives for inter-frequency small cell measurements p. 45
6.3 Analysis of existing inter-frequency measurements p. 45
6.4 Potential enhancements for improved small cell discovery/identification p. 46
6.4.1 Solution 1: Longer measurement period [20] p. 46
6.4.3 Solution 9: UE MSE based measurements [21,32] p. 46
6.4.4 Solution 10: Small cell signal based control of measurements [22] p. 46
6.4.5 Solution 4: Measurements without gap assistance [23] p. 46
6.4.6 Solution 2: Small cell discovery signal in macro layer [24] p. 46
6.4.7 Solution 6: UE based proximity detection [25, 33] p. 46
6.4.8 Solution 5/ 7: Proximity detection based on macro/pico cell listening [26, 27] p. 46
6.4.9 Solution 8: Proximity detection with broadcast assistance [28, 33] p. 47
6.5 Evaluation results p. 47
7 Automatic Re-establishment procedures for mobility robustness p. 48
8 Mobility enhancements for Multi-Carrier (including CA) in HeNBs with potentially different CSGs p. 48
9 Overall observations from the study on HetNet mobility p. 48
A Detailed evaluation results on potential enhancements for inter-frequency small cell measurements p. 50
$ Change history p. 53
