Overshooting Analysis
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Transcript of Overshooting Analysis
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8/3/2019 Overshooting Analysis
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HUAWEI TECHNOLOGIES CO., LTD.
3G Overshooting Analysis
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8/3/2019 Overshooting Analysis
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HISILICON SEMICONDUCTOR
HUAWEI TECHNOLOGIES CO., LTD. Page 2
Content
Analysis Indicator
TP analysis
Per Neighbor stats
Google check
Tilt Calculation
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HISILICON SEMICONDUCTOR
HUAWEI TECHNOLOGIES CO., LTD. Page 3
Overhooting Concept
Specify theoretical serving distance based on site to site distance
per clutter type.
Create short list from TP stats.
Create short list from per neighbor stats.
Check the cells which is in short list from the google-earth one by
one to confirm.
Calculate the tilts with the tool based on antenna height, type and
terrain height.
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HISILICON SEMICONDUCTOR
HUAWEI TECHNOLOGIES CO., LTD. Page 4
TP Analysis
The Physical Random Access Channel (PRACH) is the only common channel
on which the uplink open loop power control is applied.
The UE transmits the first preamble to the NodeB to start an access
process. Till the AICH received by the Ue successfully, Ue keep
sending preamble till reach MaxPreamble Number and Max Ue power which
is defined with the parameters.
RNC calculates the TP value(speed and time) and the number of
sample(by successful message)
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HISILICON SEMICONDUCTOR
HUAWEI TECHNOLOGIES CO., LTD. Page 5
TP Analysis(Example)
You can see in below, raw data of TP values versus Number of Ec/No and
Mean Ec/No.
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HISILICON SEMICONDUCTOR
HUAWEI TECHNOLOGIES CO., LTD. Page 6
TP Analysis(Example)
To create pivot table, we revert the TP values to distance, the
formula for it is like below
Distance(m)=(TP+117)*234
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HISILICON SEMICONDUCTORHUAWEI TECHNOLOGIES CO., LTD. Page 7
TP Analysis(Pivot to analyze)
To create pivot table, we revert the TP values to distance, the
formula for it is like below
Distance(m)=(TP+117)*234
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HISILICON SEMICONDUCTORHUAWEI TECHNOLOGIES CO., LTD. Page 8
SHO PerNeighbor Stats
We take SHO per neighbor stats which is showing SHO attempts per relations
for each cell.
Calculate the Distance for each relation by using below formula in excell.
SQRT((C2-F2)^2+(D2-G2)^2)*100
C2=Lon1 D2=Lat1
F2=NLon G2=NLat
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8/3/2019 Overshooting Analysis
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HISILICON SEMICONDUCTORHUAWEI TECHNOLOGIES CO., LTD. Page 9
SHO PerNeighbor Stats
By Neighbouring Cell Name, SUM of Total Attempts, AVG of Distance
Enough only to analyze F1,Sort By Sum of Total Attempts
This will give you a Score of how dominant a Cell is in a Cluster, and
the Average Distance of Other Cells which register it as a Nbr from MR
Data,If a Cell is very dominant, it could indicate Overshooting
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8/3/2019 Overshooting Analysis
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HISILICON SEMICONDUCTORHUAWEI TECHNOLOGIES CO., LTD. Page 10
Google Check
For the short list that we create from TP and the SHO per neighbor stats,
we need to confirm that site location and site to site distance in thearea which means real situation of the overshooting cells.
~
Elevation profile feature of
google earth is very usefull
to confirm and finalized the
overshooting list to passthe calculation stage.
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HISILICON SEMICONDUCTORHUAWEI TECHNOLOGIES CO., LTD. Page 11
Tilt Calculation(Theory)
Final Part of the Overshooting cells optimization is the Tilt
calculation of the overshooters.Below graph and the formula is showingtheoretical calculation.
Formula; Arctan=k+h
kd
h
d=Tilt angle
k=Terrain difference
h=Antenna height
d=Distance that we want
to serve
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HISILICON SEMICONDUCTORHUAWEI TECHNOLOGIES CO., LTD. Page 12
Tilt Calculation(tool)
We dont calculate the tilts one by one by manually. We use tool(is
using the formula that we explain previous slide) that calculate thetilts automatically which is like below.