ILSA Slides

7/21/2019 ILSA Slides

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Copyright 2002 AIRCOM International Ltd.

ENTERPRISE / ASSET !.2

Terry Walker


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What is ILSA ?What is ILSA ?

ILSAis the Frequency Planning module within ASSET

ILSA= Intelligent Local Search Algorithm


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What is ILSA ?What is ILSA ?

An advanced Heuristic Search Algorithm,

utilising techniques in cominatorial mathematics

!esigned "or P#$%&'()S$&*+-, ased u.on/Trial)and)error0 e1.loration o" .ossile solutions


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CONSTRAINTS

Carrier Separations (e.g. intra-cell, intra-site, inter-neigho!rs"

E#ceptions et$een Cells

%ori&&en Carriers

%i#e& Carriers

Concepts o' ILSAConcepts o' ILSA


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COSTS

Eer) speci'ie& CONSTRAINT has an associate& Cost

(alias *+enalt)" inc!rre& 'or iolation o' that constraint.


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'valuates the 2cost3 o" a .articular "requency .lan4

Tries to minimise the costo" the whole .lan ye1.erimentally modi"ying the "requency allocation4

+nitially concentrates on /high cost0 areas4

(akes ra.id im.rovements to .lan in early stages, ut triesradical random changes when .rogress is slower4


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2Cost3 is incurred "rom two sources5 )

6arrier Se.aration Constraintsare set u., and i" the "requency.lan violates any o" these, a user)s.eci"ied 2Cost3 will e incurred4

The Inter'erence Talecan also e an in.ut to the .lan4

The Costo" any "requency allocation will incor.orate the area7km89

and:or tra""ic7m'9 a""ected y inter"erence4

Costsshould e /weighted0 against each other in order to re.resent theircom.arale /im.ortance04

ILSA $ill al$a)s tr) to re&!ce the oerall *amalgamate& cost4


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ILSA - +rocess an& ata %lo$ILSA - +rocess an& ata %lo$

The secrets o" generating a good "requency .lan with+&SA can e summarised as5

;nderstanding how to .er"orm the .rocedural stepsinvolved

;nderstanding which inp!tsare required and whether they aremandatory or o.tional

;nderstanding the o!tp!tsand how to inter.ret them


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+rere/!isites 'or ILSA+rere/!isites 'or ILSA

Site ataaseset !p $ithCarrier La)ersassigne& an&

al!es in place 'or *Carriers Re/!ire&.

Recommen&e&0

Inter'erence Tale .

Neigho!r list.

Tra''ic Raster .


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Inp!ts to ILSAInp!ts to ILSA

Frequency Plan

+&SA

6ost (atri1 Site !ataase +nter"erence Tale

Array 6reation Tra""ic #aster Wi


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Limitations o' ILSALimitations o' ILSA

Always .roduces 7i4e4 suggests9 a Frequency Allocation

Always tries to im.rove within the s.eci"ied 6onstraints

;nrealistic constraints ;nrealistic "requency .lan

+" "requency allocation is unworkale5 consider rela1ing the constraints

increase numer o" cells in the network

increase numer o" "requencies availale


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ASSET +lanning Tool 1 Steps to ILSAASSET +lanning Tool 1 Steps to ILSA

+er'orm Coerage +lanning

+er'orm Tra''ic +lanning an& anal)se Carrier Re/!irements

+er'orm Neigho!rs +lanning

2enerate Inter'erence Tale

+er'orm %re/!enc) +lanning (ILSA"


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+re&icting Coerage+re&icting Coerage


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Anal)sing CoerageAnal)sing Coerage


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Sprea&ing Tra''icSprea&ing Tra''ic


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Tra''ic RasterTra''ic Raster


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Create Neigho!r ListCreate Neigho!r List


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2raphical ispla) o' Neigho!rs2raphical ispla) o' Neigho!rs


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Create Inter'erence TaleCreate Inter'erence Tale


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Inter'erence TaleInter'erence Tale


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ILSA (Intelligent Local Search Algorithm"ILSA (Intelligent Local Search Algorithm"


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R!nning ILSAR!nning ILSA


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Anal)sis o' the %re/!enc) +lanAnal)sis o' the %re/!enc) +lan

$nce the suggested +&SA Frequency Plan is Applie&to the Site !ataase, the .lan can e anal)se&in anumer o" ways>


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Anal)sing the res!ltsAnal)sing the res!lts

Worst Connection Arra) 3 Statisticsgives the total level o" inter"erence on theworst connection within the .i1el

Aerage Connection Arra)4Stats.averages the total level o" inter"erenceacross all serving connections at the .i1el

Worst Inter'erer Arra)4Stats.gives the individual worst inter"erer at the.i1el

Total Inter'erence Arra)4Stats.gives the ratio o" the total signal strengthwithin the .i1el to the total inter"eringstrength in d%


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Anal)sing the res!ltsAnal)sing the res!lts

%re/!enc) +lan Reporter

-enerates a re.ort detailing5

All the se.aration constraintsroken

The levels o" inter"erence

caused y each allocation7i" +nter"erence Tale in memory9


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The Iteratie +rocessThe Iteratie +rocess

Analyse

Existing

Plan

Create

Prerequisites

Analyse

Results

Set-up

ILSA/Cost

Matrix

Run

ILSA

Start

"ini#h

No

$e#

Acceptable

Improvement

Acceptable

Improvement

%&or#t Inter'erer Stati#ti(#%A)erage Conne(tion Stati#ti(#%"re*+en(y Plan Report

%Carrier# Re*+ired%Inter'eren(e Ta,le%Neigh,o+r# and E-(eption#

%ILSA Set+p%Co#t Matri- Set+p

%&or#t Inter'erer Stati#ti(#%A)erage Conne(tion Stati#ti(#%"re*+en(y Plan Report


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Documents

ILSA Slides