Content for TR 25.800 Word version: 12.1.0
5 Deployment scenarios
6 Aspects of heterogeneous networks
7 Solutions and techniques
8 Impact on specifications
9 Conclusion
A Performance evaluation methodology
$ Change History
5 Deployment scenarios p. 12
6 Aspects of heterogeneous networks p. 14
6.1 Interference in co-channel scenario p. 14
6.1.1 Coverage issues p. 15
6.1.2 Uplink interference issues p. 15
6.1.3 Downlink interference issues p. 16
6.1.4 Strong mismatch zone p. 16
6.1.5 Uplink/Downlink imbalance issues p. 18
6.2 Mobility aspects p. 23
7 Solutions and techniques p. 25
7.1 Solutions for co-channel scenarios p. 25
7.1.1 Analysis of UL/DL mismatch p. 25
7.1.1.1 DL coverage boundary p. 26
7.1.1.2 UL coverage boundary p. 26
7.1.1.3 Matching the UL and DL coverage p. 26
7.1.2 Solutions for legacy terminals p. 28
7.1.3 Rel-12 enhancements p. 30
7.1.3.2 Introduction of secondary pilot p. 31
7.1.3.4 Dynamic power boosting p. 31
7.1.3.5 E-TFC selection backoff for uplink SI p. 31
7.1.3.6 E-DCH decoupling p. 32
7.1.3.6.1 Description of E-DCH decoupling operation p. 32
7.1.3.6.2 Evaluation of E-DCH decoupling p. 34
7.1.3.6.3 HSUPA DL control channels reliability with E-DCH decoupling p. 40
7.1.3.6.4 Conclusions for E-DCH decoupling p. 42
7.1.3.7 Enhanced inner-loop power control restriction p. 42
7.1.4 Evaluation of solutions for HS-DPCCH p. 43
7.1.4.1 Evaluation 1 p. 43
7.1.4.2 Evaluation 2 p. 44
7.1.5 Evaluation of noise padding/desensitization p. 46
7.1.6 Solutions for the strong mismatch zone p. 50
7.1.6.1 Introduction of an extended active set p. 50
7.1.6.2 Common E-RGCH p. 51
7.1.6.3 Inter-Cell Interference Cancellation (ICIC) p. 52
7.1.6.4 UL throughput limitation for identified UEs p. 53
7.1.6.5 Carrier frequency switch for identified UEs p. 53
7.1.7 Performance evaluation of HetNet in co-channel scenarios p. 54
7.1.7.1 Downlink system performance p. 54
7.1.7.2 Uplink system performance p. 60
7.1.7.3 MIMO performance p. 61
7.1.8 Network Assisted Interference Cancellation (NAIC) p. 62
7.1.8.1 Interference Cancellation p. 62
7.1.8.2 Aspects of Network Assisted Interference Cancellation p. 63
7.1.8.2.1 Post-decoding IC, pre-decoding IC and Type 3i p. 63
7.1.8.2.2 Signalling of information for IC p. 63
7.1.8.2.3 Coordinated scheduling and Restricted Resources Subframe p. 64
7.1.8.3 Performance evaluation p. 65
7.1.8.3.1 Simulation results of successful decoding rate of the interfering signal p. 67
7.1.8.3.2 Post-decoding Interference Cancellation p. 68
7.1.8.3.3 System level simulation for post-decoding p. 73
7.1.8.3.4 Link level simulation results with Network Assisted Interference Cancellation p. 73
7.1.8.3.5 Link level simulations for RRS p. 73
7.2 Range expansion p. 76
7.2.1 Range expansion for co-channel deployments p. 76
7.2.1.1 Downlink control channel evaluation p. 76
7.2.1.1.1 Evaluation methodology p. 76
7.2.1.1.2 Evaluation of F-DPCH performance and impact on the uplink p. 78
7.2.1.1.3 Evaluation of E-HICH performance p. 83
7.2.1.1.4 Evaluation of HS-SCCH performance and impact on the downlink p. 88
7.2.1.1.5 Total power overhead for F-DPCH, E-HICH and HS-SCCH p. 95
7.2.1.1.6 Performance evaluation of F-DPCH transmitted from the non-serving LPN p. 95
7.2.1.1.7 Conclusion p. 97
7.2.1.2 Uplink system simulation results for range expansion p. 97
7.2.1.3 Downlink system simulation results with range expansion p. 99
7.2.2 Range expansion for multi-carrier deployments p. 101
7.2.2.1 Scenario 1: Macro cells and LPNs have only one shared carrier p. 101
7.2.2.2 Scenario 2: Macro cells and LPNs have two shared carriers p. 101
7.2.2.3 Dual-Frequency Dual-Cell (DF-DC) operation p. 103
7.2.2.4 Performance of Single Frequency Dual Cell scenario p. 103
7.2.2.5 Performance of Macro power reduction as an LPN range expansion technique p. 104
7.2.2.5.1 Interference limited system with full buffer traffic p. 104
7.2.2.5.2 Thermal noise limited system with full buffer traffic p. 106
7.2.2.5.3 Interference limited system with bursty traffic p. 108
7.2.2.5.4 Thermal noise limited system with bursty traffic p. 113
7.2.2.5.5 Performance in a mixed deployment scenario p. 116
7.2.2.5.6 Summary p. 119
7.2.3 Decentralised biasing p. 119
7.3 Combined cell p. 121
7.3.1 Motivation of combined cell deployments p. 121
7.3.2 Typical deployment scenarios and use cases p. 123
7.3.3 Transmission modes p. 124
7.3.4 System performance p. 125
7.3.4.1 Single Frequency Network Mode p. 125
7.3.4.2 Node selection with Spatial Reuse Mode p. 128
7.3.4.2.1 Solution I (using low power level probing pilots and demodulation pilots) p. 128
7.3.4.2.2 Solution II (using high power level demodulation pilots) p. 129
7.3.4.2.3 System simulation results for Solution I p. 130
7.3.4.2.4 System simulation results for Solution II p. 131
7.3.4.2.5 Link simulation results for Solution I and Solution II p. 131
7.3.4.2.6 Conclusions on performance of Spatial Reuse Mode p. 135
7.3.5 Legacy UE performance in combined cell p. 135
7.3.5.1 System level analysis p. 136
7.3.5.2 Link level analysis p. 136
7.3.5.3 Performance of legacy users with spatial reuse p. 137
7.3.5.4 System level analysis of legacy users with spatial reuse p. 139
7.3.5.5 Conclusions on legacy UE performance p. 142
7.3.5.6 IPICH based solution for combined cells p. 143
7.4 Mobility aspects p. 149
7.4.1 Solutions to small cell discovery and identification p. 149
7.4.2 Solutions to the mobility performance degradation caused by high UE speed p. 150
7.4.3 Solutions to the issues of massive deployment of small cells p. 152
7.4.4 Mobility aspects related with combined cell p. 152
7.4.5 Solutions to the issues of Multiflow and multi-carrier operation p. 153
8 Impact on specifications p. 154
9 Conclusion p. 154
A Performance evaluation methodology p. 157
A.1 System simulation assumptions p. 157
A.2 System performance evaluation metrics p. 160
A.3 Link simulation assumptions p. 161
A.4 Link performance evaluation metrics p. 162
A.5 Link simulation assumptions and metrics for modelling HS-DPCCH performance p. 162
A.6 Mobility simulation assumptions p. 163
A.7 Mobility simulation performance metrics p. 164
A.8 Mobility simulation results p. 164
A.9 Observations from the mobility simulation results p. 164
$ Change History p. 165
