06-诺西公司-(原摩托)LTE网络拓扑增强(AWT)介绍.ppt

Simulation Conclusions Improved User Experience Pico nodes increase system capacity and improves coverage within Hot Spot areas 10X increase in user throughputs Little Change in Macro Cell Throughput At or below roof top propagation and low power pico nodes minimizes the amount of interference to the macro sites Users attach to the best serving site ICIC between Macro and Pico nodes not applied in cases studied. Clustered Pico Cells Large capacity gains are possible with pico-clusters Scalable – Additional pico nodes can be added where capacity is needed Macro-cell capacity is preserved Central controller enables interference coordination between pico nodes Best Server Image Pico antenna design important ZeNB Mobility Challenges Challenge: Macro Coexistence Full mobility with macro 4G Idle mobility Methods for determining UE attachment (macro or Pico) based on UE characteristics (speed, RF) Active mobility Selecting best HO target given that more HO combinations exist Speed dependent handovers (Study Item) Design Approach: Transparent Intra-ZeNB Mobility Reuse existing eNB mobility management design Support S1/X2 handovers Support 2G/3G mobility procedures Tune RRC parameters for cell selection and measurement reporting behavior Avoid changes to devices EPC eNB eNB ZeNB ZeNB Internet ZeNB-Cntrl Z-AP Z-AP … Z-AP Distributed GW+ System/UE Service Parity Macro-Mobility Macro-Transparency Standard Interfaces TransparentMobility Cluster UE software unchanged and uses 3GPP procedures for cell selection and handover ZeNB Mobility Idle Mobility UE uses reselection procedures according to 36.304 Active Mobility Handovers between APs managed by ZeNB Controller Identical to intra-eNB cell handovers Transparent to EPC Supported scenarios Inter-AP handovers X2: ZeNB-ZeNB; ZeNB-macro eNB S1: ZeNB-ZeNB; ZeNB-macro eNB Macro eNB assumptions ZeNBs provisioned into NRT ZeNB assumptions Macro eNBs provisioned into NRT ZeNB supports both X2 and S1 handovers MME and SGW treat Z