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FREQUENCY PLAN FREQUENCY PLAN VALIDATIONVALIDATION

USING ATOLLUSING ATOLL

Presentation by Ghazzal Olubajo

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INTRODUCTION

It can be argued that Frequency Plan (Strategy) have direct impact not only Quality of Service but also on Spectrum Efficiency.

Hence effort is required to ensure maximum possible utilization of the limited bandwidth available.

Optimizer tool is available for Automatic Frequency Plan (AFP) and can also be used to select the best of several plans. Here we focus basically on Validation of Frequency Plans using ATOLL .

This will be of help in daily optimization process and for Network Wide AFP activity.

It is important to be certain that the output of any change will give a better Quality before implementation.

Changing Frequency, Azimuth, Tilts will give likely output

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CONTENTS

• PREPARE NETWORK PROJECT– OPEN PROJECT AND UPDATE COORDINATE SYSTEM– IMPORT DIGITAL MAPS– UPDATE LOSSES– PROPAGATION MODEL– DATABASE UPDATE– MANAGING TABLES

• VALIDATE FREQUENCY PLAN– FREQUENCY USAGE– C/I PREDICTION– REPORT GENERATION– CELL PARAMETER MODIFICATION

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OPEN PROJECT AND UPDATE COORDINATE SYSTEM

It is assumed that the tool is available with required license

“GSM GPRS EGPRS” is selected in window above to display an open map view.Tools > Options displays query box below where units and coordinate system is updated

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IMPORT DIGITAL MAP

It is assumed that digital map is available for the area.

The path “FILE > Import “ gives the Query to select the folder where Map is located and view is as above.Each of the folders “Clutter” and “Heights” will have an object named “index.txt” this will be selected in each case and respective object selected as below.

Altitude HeightsClutter Class Clutter

A view similar to next slide is seen under Geo tab and project can be saved as desired

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IMPORT DIGITAL MAP

Above is an example of Clutter Map and below is Altitude/ Digital Terrain Model. “View Legend Window displays the legend “

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UPDATE CLUTTER LOSSES

Right click on Clutter Class under Geo Tab will give the view to input Clutter losses in case of indoor prediction

3 Tabs will be noticed at the upper left part of the tool as below:

Data: All sites information can be foundGeo: Geographical information can be foundModules: Add-in tools can be found e.g Propagation Models

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PROPAGATION MODEL

Selection and Propagation model is of great importance but has to be done carefully once on a project.It is important that this is tuned to conform with Drive Test output/Link Budget for the area to ensure output is closest to real life scenario

Urban Large City 63Urban Medium City 60

Sub Urban   57Rural Quasi Open 50Rural Open 53

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MANAGING TABLES

To update the database, The tables can be opened as illustrated below

Subcells and TRX table require a Right Click on Transmitter Subcells Open Table/TRX

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MANAGING TABLES

Additional Field can be added to the tables as below when required with a right click on the header.

Below is view of Query (TRX+BTS) from DUMP to show BTS Name, BCCH TRX, Frequency and TRX ID.

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MANAGING TABLES

After Tables are updated, Sites will appear similar to above

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MANAGING TABLES

SITES Table: Site Name, Coordinate.

TRANSMITTER table: Site Name, Transmitter ID, Antenna Type, Azimuth, Height, Mechanical Tilt, Electrical Tilt, Max (coverage) range, EIRP/Power, Propagation Model, Reception Threshold

TRX Table: Transmitter, Index, TRX ID (from Dump), TRX Type, Channel (frequency)

ANTENNA Type: Antenna Pattern information should be requested from the Antenna supplier and imported into the tool for a best output.

Important Update required are as below

  ACCESS DATABESE (DUMP)     ATOLL DATABASE  

  BSCId BCFId BTSId TRXId nwName channel0Type initialFrequency  Site Name

Transmitter Transmitter Index TRX ID TRX Type Channel

B175611 210851 10 365 1 B17561 3 14   B0157 B0157_1 B01571 1 1 4 3B175612 210851 10 365 2 B17561 4 1   B0157 B0157_1 B01571 2 2 3 22B175623 210851 10 366 3 B17562 4 11   B0157 B0157_2 B01572 1 3 4 1B175624 210851 10 366 4 B17562 3 24   B0157 B0157_2 B01572 2 4 3 16B024711 210851 100 1131 1 B02471 4 8   B0157 B0157_3 B01573 1 5 4 10B024712 210851 100 1131 2 B02471 3 20   B0157 B0157_3 B01573 2 6 3 12B024723 210851 100 1132 3 B02472 4 5   B0157 B0157_5 B01575 1 7 4 820B024724 210851 100 1132 4 B02472 2 17   B0157 B0157_5 B01575 2 8 2 852B024735 210851 100 1133 5 B02473 4 14   B0157 B0157_5 B01575 3 9 3 858B024736 210851 100 1133 6 B02473 3 23   B0157 B0157_5 B01575 4 10 2 881B024757 210851 100 1314 7 B02475 4 818   B0157 B0157_6 B01576 1 11 4 823B024758 210851 100 1314 8 B02475 3 857   B0157 B0157_6 B01576 2 12 3 866B0247610 210851 100 1315 10 B02476 3 877   B0157 B0157_6 B01576 3 13 2 849B024769 210851 100 1315 9 B02476 4 813   B0157 B0157_6 B01576 4 14 3 871

Similar table below is required to update the TRX table with the right information to ensure every TRX is mapped correctly

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CONTENTS

• PREPARE NETWORK PROJECT– OPEN PROJECT AND UPDATE COORDINATE SYSTEM– IMPORT DIGITAL MAPS– UPDATE LOSSES– PROPAGATION MODEL– DATABASE UPDATE– MANAGING TABLES

• VALIDATE FREQUENCY PLAN– FREQUENCY USAGE– C/I PREDICTION– C/I ANALYSIS– REPORT GENERATION– CELL PARAMETER MODIFICATION

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FREQUENCY USAGE

Besides Carrier to Interference prediction, First check for a good Frequency plan is Frequency Reuse.This must be harmonious and all channels should be used almost equally.

Here, use of Channel 1 need to be reduced

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CARRIER TO INTERFERENCE PREDICTIONdedeedede

Right Click on Predictions New Coverage by C/I Level

Display page is as below but can be modified. The approach is to eliminate C/I value less than 9dB

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CARRIER TO INTERFERENCE PREDICTIONdedeedede

Right Click on Coverage by “C/I Level Calculate “ to begin the prediction

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C/I ANALYSIS AND REPORT GENERATIONdedeedede

Interest is to improve the coverage where People reside. Below is view of clutter map of the area

Analysis at selected point shows that B14482 is interfered by B12901 which are the best servers in the area

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C/I ANALYSIS AND REPORT GENERATIONdedeedede

Right Click on Coverage by “C/I Level Generate Report “

Report helps show which area we need to focus for frequency retune and level of impact

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CELL PARAMETER MODIFICATIONdedeedede

Right Click on cell Properties“ to display cell Parameters

On the Transmitter Tab, antenna parameters can be modified Azimuth, Elect Tilt, Mech Tilt while Frequency can be modified on TRX Tab

Prediction need to be regenerated once any of the above is modified to view possible improvement

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