Content for TR 36.872 Word version: 12.1.0
2 References
3 Definitions and abbreviations
4 Small cell scenarios for evaluation
5 Potential enhancements to improve spectrum efficiency
6 Mechanisms to ensure efficient operation of a small cell layer
7 Physical layer study for small cell enhancements higher-layer aspects
A Simulation model
$ Change History
2 References
3 Definitions and abbreviations Word‑p. 7
4 Small cell scenarios for evaluation
4.1 Scenario #1 Word‑p. 8
4.2 Scenario #2a Word‑p. 9
4.3 Scenario #2b Word‑p. 10
4.4 Scenario #3 Word‑p. 11
5 Potential enhancements to improve spectrum efficiency Word‑p. 12
5.1 Introduction of a higher order modulation scheme for the downlink
5.2 Enhancements and overhead reduction for UE-specific reference signals and control signalling Word‑p. 19
6 Mechanisms to ensure efficient operation of a small cell layer Word‑p. 24
6.1 Mechanisms for interference avoidance and coordination among small cells
6.1.1 Small cell on/off
6.1.1.1 Small cell on/off schemes and performance gains
6.1.1.1.1 Semi-static small cell on/off schemes and performance gains
6.1.1.1.2 Ideal, dynamic small cell on/off schemes and performance gains Word‑p. 38
6.1.1.1.3 NCT with reduced CRS and performance gains Word‑p. 43
6.1.1.2 Small cell on/off energy saving Word‑p. 44
6.1.1.3 Time scales for on/off transitions Word‑p. 46
6.1.1.3.1 Feasible time scales based on legacy procedures
6.1.1.3.2 Feasible time scales enhancements Word‑p. 47
6.1.1.4 Potential impacts on network performance other than throughputs
6.1.1.5 Standards impacts for enhancements
6.1.1.6 Conclusions
6.1.2 Enhanced power control/adaptation Word‑p. 48
6.1.3 Enhancement of frequency domain power control and/or ABS to multi-cell scenarios
6.1.3.1 Enhancement of (e)ICIC to multi-cell scenarios for small cell deployments
6.1.3.2 Enhancement of EPDCCH for small cell deployments Word‑p. 49
6.1.4 Load balancing/shifting
6.2 Mechanisms for efficient discovery of small cells and their configurations Word‑p. 50
6.2.1 Performance evaluation
6.2.1.1 Rel-8 mechanism
6.2.1.2 PSS/SSS interference canceller-based mechanism Word‑p. 52
6.2.1.3 Other RS-based mechanisms (with existing RS) Word‑p. 54
6.2.1.4 Modified SS/RS or new discovery signal-based mechanism Word‑p. 56
6.2.1.5 Evaluation on opportunistic activation and deactivation of small cells based on UL signals Word‑p. 57
6.2.1.6 Additional observation related to inter-frequency small cell discovery
6.2.2 Enhancements of small cell discovery Word‑p. 58
6.2.2.1 PSS/SSS interference cancellation
6.2.2.2 Burst transmission of DL-SS/RS
6.2.2.3 Network synchronization and assistance
6.2.2.4 New discovery mechanism
6.2.2.5 Transmission of DL-SS/RS at specific carrier Word‑p. 59
6.2.2.6 Relaxed RAN4 requirement
6.2.2.7 Specification impacts
6.2.3 Necessity of PCI extension Word‑p. 60
6.2.4 Summary on small cell discovery
6.3 Feasibility and benefits of radio-interface based synchronization mechanisms Word‑p. 61
6.3.1 Network listening Word‑p. 62
6.3.1.1 Introduction of network listening
6.3.1.2 Review of the standard work of network listening schemes
6.3.1.3 Achievable synchronization accuracy
6.3.1.4 Network listening period configuration Word‑p. 63
6.3.1.5 Resource overhead
6.3.1.6 Applicability/compatibility with the ongoing studies
6.3.1.7 Support of inter-operator synchronization
6.3.1.8 Cost and complexity
6.3.1.9 Standards impacts
6.3.1.10 Performance evaluation Word‑p. 64
6.3.2 UE-assisted synchronization Word‑p. 70
6.3.2.1 Achievable synchronization accuracy
6.3.2.2 Resource overhead
6.3.2.3 Applicability/compatibility with the ongoing studies
6.3.2.4 Support of inter-operator synchronization
6.3.2.5 Standards impacts
6.3.3 Summary Word‑p. 71
7 Physical layer study for small cell enhancements higher-layer aspects Word‑p. 72
A Simulation model Word‑p. 73
A.1 General evaluation assumptions
A.1.1 Scenario 1
A.1.2 Scenario 2a Word‑p. 76
A.1.3 Scenario 2b (sparse) Word‑p. 78
A.1.4 Scenario 2b (dense) Word‑p. 83
A.1.5 Scenario 3 (sparse) Word‑p. 88
A.1.6 Scenario 3 (dense) Word‑p. 91
A.2 Uplink specific evaluation parameters Word‑p. 94
A.3 Evaluation assumptions for spectrum efficiency enhancements Word‑p. 95
A.4 Evaluation assumptions for efficient operation Word‑p. 97
$ Change History Word‑p. 100
