HO fail problem

**magno22** · 2012-11-06, 02:14 PM

Dears,
i have some 2G HO problem that is Best cell HO fail case is high. It was happen between 900 and 1800 cells, this cells direction is same and location is same.
1800 cells Layer is 2 and 900 cells layer is 3. For using purpose of only traffic we set -85dBm by RX ACCESS MIN LEVEL.
Before i changed timers and interlayer Ho threshold and interlayer HO hysteresis. But it will not affect HO success rate. How to optimize this problem? Please help us this issue. Parameters are follows

+++ HUAWEI %%LST GCELLHOBASIC: IDTYPE=BYID, CELLID=100001, LstFormat=VERTICAL;%% RETCODE = 0 Execution succeeded. List Basic Handover Parameters of Cell -------------------------------------- Cell Index = 100001 Cell Name = 100001 Current HO Control Algorithm = Handover algorithm I Co-BSC/MSC Adj = Yes SDCCH HO Allowed = No Intracell HO Allowed = No Intracell F-H HO Allowed = Yes Load Handover Support = No MS Fast Moving HO Allowed = No Rx_Level_Drop HO Allowed = No PBGT HO Allowed = Yes Level HO Allowed = Yes Edge HO Allowed = Yes BQ HO Allowed = Yes TA HO Allowed = Yes Concentric Circles HO Allowed = No Interference HO Allowed = Yes Edge HO UL RX_LEV Threshold = 10 Edge HO DL RX_LEV Threshold = 20 Handover Algorithm II Edge HO Watch Time = <NULL> Handover Algorithm II Edge HO Valid Time = <NULL> Intracell F-H HO Stat Time = 10 Intracell F-H HO Last Time = 8 F2H HO Threshold = 25 H2F HO Threshold = 12 Inter-layer HO Threshold = 33 Inter-layer HO Hysteresis = 2 Min UL Level on Candidate Cell = 0 Min DL Level on Candidate Cell = 15 TIGHT BCCH HO Watch Time = 6 TIGHT BCCH HO Valid Time = 4 Quick Handover Enable = No Concentric Circles ATCB HO Allowed = Close Interfere HO Static Time = <NULL> Interfere HO Valid Time = <NULL> Better Cell Handover Enable = <NULL> AMR F-H Ho Allowed = <NULL> AMR F-H Traffic Threshold = <NULL> F-H Ho Duration = <NULL> F-H Ho Period = <NULL> AMR F-H Ho Pathloss Adjust Step = <NULL> AMR F-H Ho ATCB Adjust Step = <NULL> AMR F-H Ho Pathloss Threshold = <NULL> F-H Pathloss Offset Overlay = <NULL> AMR F-H Ho ATCB Threshold = <NULL> F-H ATCB Offset Overlay = <NULL> AMR F-H Ho Qual. Threshold = <NULL> F-H Ho Stat. Time = <NULL> F-H Ho Last Time = <NULL> AMR H-F Traffic Threshold = <NULL> Allow AMR H-F Quality-based HO = <NULL> H-F Ho Duration = <NULL> AMR H-F Ho ATCB Threshold = <NULL> H-F ATCB Offset Overlay = <NULL> AMR H-F Ho Pathloss Threshold = <NULL> H-F Pathloss Offset Overlay = <NULL> AMR H-F Ho Qual. Threshold = <NULL> H-F Ho Stat. Time = <NULL> H-F Ho Last Time = <NULL> Non-AMR F-H Ho Allowed = <NULL> Non-AMR F-H Traffic Threshold = <NULL> Non-AMR F-H Ho Pathloss Adjust Step = <NULL> Non-AMR F-H Ho ATCB Adjust Step = <NULL> Non-AMR F-H Ho Pathloss Threshold = <NULL> Non-AMR F-H Ho ATCB Threshold = <NULL> Non-AMR F-H Ho Qual. Threshold = <NULL> Non-AMR H-F Traffic Threshold = <NULL> Allow Non-AMR H-F Quality-based HO = <NULL> Non-AMR H-F Ho ATCB Threshold = <NULL> Non-AMR H-F Ho Pathloss Threshold = <NULL> Non-AMR H-F Ho Qual. Threshold = <NULL> Inter-RAT Out BSC Handover Enable = No Inter-RAT In BSC Handover Enable = No Allow Incoming BSC Handover at Iur-g = No Inter-RAT Cell Reselection Enable = No Pathloss Ho. Enable = <NULL> Handover Algorithm I Edge HO Watch Time = 6 Handover Algorithm I Edge HO Valid Time = 4 (Number of results = 1) --- END

+++ HUAWEI %%LST GCELLHOBASIC: IDTYPE=BYID, CELLID=100002, LstFormat=VERTICAL;%% RETCODE = 0 Execution succeeded. List Basic Handover Parameters of Cell -------------------------------------- Cell Index = 100004 Cell Name = 100002 Current HO Control Algorithm = Handover algorithm I Co-BSC/MSC Adj = Yes SDCCH HO Allowed = No Intracell HO Allowed = No Intracell F-H HO Allowed = Yes Load Handover Support = No MS Fast Moving HO Allowed = No Rx_Level_Drop HO Allowed = No PBGT HO Allowed = Yes Level HO Allowed = Yes Edge HO Allowed = Yes BQ HO Allowed = Yes TA HO Allowed = Yes Concentric Circles HO Allowed = No Interference HO Allowed = Yes Edge HO UL RX_LEV Threshold = 15 Edge HO DL RX_LEV Threshold = 25 Handover Algorithm II Edge HO Watch Time = <NULL> Handover Algorithm II Edge HO Valid Time = <NULL> Intracell F-H HO Stat Time = 10 Intracell F-H HO Last Time = 8 F2H HO Threshold = 30 H2F HO Threshold = 10 Inter-layer HO Threshold = 33 Inter-layer HO Hysteresis = 2 Min UL Level on Candidate Cell = 0 Min DL Level on Candidate Cell = 20 TIGHT BCCH HO Watch Time = 6 TIGHT BCCH HO Valid Time = 4 Quick Handover Enable = No Concentric Circles ATCB HO Allowed = Open Interfere HO Static Time = <NULL> Interfere HO Valid Time = <NULL> Better Cell Handover Enable = <NULL> AMR F-H Ho Allowed = <NULL> AMR F-H Traffic Threshold = <NULL> F-H Ho Duration = <NULL> F-H Ho Period = <NULL> AMR F-H Ho Pathloss Adjust Step = <NULL> AMR F-H Ho ATCB Adjust Step = <NULL> AMR F-H Ho Pathloss Threshold = <NULL> F-H Pathloss Offset Overlay = <NULL> AMR F-H Ho ATCB Threshold = <NULL> F-H ATCB Offset Overlay = <NULL> AMR F-H Ho Qual. Threshold = <NULL> F-H Ho Stat. Time = <NULL> F-H Ho Last Time = <NULL> AMR H-F Traffic Threshold = <NULL> Allow AMR H-F Quality-based HO = <NULL> H-F Ho Duration = <NULL> AMR H-F Ho ATCB Threshold = <NULL> H-F ATCB Offset Overlay = <NULL> AMR H-F Ho Pathloss Threshold = <NULL> H-F Pathloss Offset Overlay = <NULL> AMR H-F Ho Qual. Threshold = <NULL> H-F Ho Stat. Time = <NULL> H-F Ho Last Time = <NULL> Non-AMR F-H Ho Allowed = <NULL> Non-AMR F-H Traffic Threshold = <NULL> Non-AMR F-H Ho Pathloss Adjust Step = <NULL> Non-AMR F-H Ho ATCB Adjust Step = <NULL> Non-AMR F-H Ho Pathloss Threshold = <NULL> Non-AMR F-H Ho ATCB Threshold = <NULL> Non-AMR F-H Ho Qual. Threshold = <NULL> Non-AMR H-F Traffic Threshold = <NULL> Allow Non-AMR H-F Quality-based HO = <NULL> Non-AMR H-F Ho ATCB Threshold = <NULL> Non-AMR H-F Ho Pathloss Threshold = <NULL> Non-AMR H-F Ho Qual. Threshold = <NULL> Inter-RAT Out BSC Handover Enable = Yes Inter-RAT In BSC Handover Enable = Yes Allow Incoming BSC Handover at Iur-g = No Inter-RAT Cell Reselection Enable = Yes Pathloss Ho. Enable = <NULL> Handover Algorithm I Edge HO Watch Time = 6 Handover Algorithm I Edge HO Valid Time = 4 (Number of results = 1) --- END

best regards,
magno22