Overshooting Analysis

8/3/2019 Overshooting Analysis

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HUAWEI TECHNOLOGIES CO., LTD.

3G 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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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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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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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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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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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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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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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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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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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.

Documents

Overshooting Analysis