nbl parameter retune - dbn18 ---- kpi benchmark report (batch-2)
DESCRIPTION
NBL parameter retuneTRANSCRIPT
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HUAWEI TECHNOLOGIES CO., LTD.
NBL (nonBCCHLayerOffset) Parameter TuningDBN18 -- Batch-2
08-Nov-2015
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Introduction:This report present the KPI benchmark after retuning BTS parameter NonBCCHLayerOffset (NBL) in DBN18.
The idea was to change NBL (nonBCCHLayerOffset) value according to NBL measurement report, in order to match GSM-DCS footpr
measurements for every cell since each cell has different footprint based in geographical location, physical parameters of the cell an
of combiners for high configuration cells etc.
Cell selection criteria:
Percentage of measurement samples out of the total measurement samples are accumulated over the range of NBL parameter i.e. -
example of how accumulation is done. For example ‘ cumulative% <= -3dB’ means percentage of samples that fall between the range
When this accumulation reaches the value of 70%, this is our cut-off point; which gives us our NBL value for a particular cell. Value o
sure that we account for a major chunk of traffic carried by the cell.
NBL value achieved in this way is then normalized to keep it within a certain range. Minimum value is selected to be 3dB and maxim
normalized value will be our new value for NBL.
Difference between the new NBL value and the current value is calculated. Cells having a difference of >=4 dB are selected as trial ce
Expected results:
•Improvement in DCR expected.
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2G KPI’s
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Results:
Total Number of Cells 50
Number of cells showing improved or same trend in KPIs 50
Number of cells that showed degradation in KPIs 0
Below is the summary of results :
Pre Value Post Value % improvement
DCR 0.27 0.233 13.7% TCH Assignment Failure 0.64 0.54 15.6%
CSSR 98.60 98.75 10.7%
j
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2G Major KPIs (excl. weekend)
13.7% improvement in DCR.
15.6% reduction in TCH assignment failure rate.
2G j
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2G Major KPIs
10.7% improvement in CSSR.
Traffic remained same for the duration of trial.
2G M j KPI
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2G Major KPIs
Minor increase in TCH blocking.
DCR BSC L l T d
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DCR – BSC Level Trend
Improvement observed in
overall DCR of DBN18.
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Conclusion
The trial has shown positive impact on KPIs, expected result has been achieved. Similar trial can be con
as well.
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