04 gsm frequency optimisation opt 3.0

7/28/2019 04 GSM Frequency Optimisation OPT 3.0

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1 Nokia Siemens Networks Presentation / PLe /23.8.2010

For public use IPR applies

NetAct Optimizer 3.0 for GSM

GSM Frequency Optimisation


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2 Noki a Si emens N etwor ks Presentation /PLe /23.8.2010


Nokia Siemens Networks

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At the end of this module the trainee should be able to:

Plan new frequencies for added TRXs

Outline the steps of the measurement based frequency

planning process

Assign and modify frequency groups, forbidden channels,

set manual separations and separation violation penalties

Perform frequency and Base Station Identity Code (BSIC)

allocation for non-hopping, baseband hopping, and

synthesised (RF) hopping networks

Compare different allocations, save and verify the results

Module Objectives


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Select the scope

Add frequencies to new TRXs

Check that you have measurements needed for frequency

optimisation Create frequency groups and set violation penalties

Assign frequency groups to BTSs

Set manual separations Define forbidden channels

Set hopping mode

Define allocation targets and start allocation Check the results

Save and provision the frequency plan

Steps in Frequency Optimisation


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Interference Analysis

Before starting the Frequency Optimisation it is useful to findthe worst interferers that cause problems over a long distance

These problem cells should be treated first and new

measurements runSee GSM Interference Matrix"

for details


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Select the scope



optimisation Create frequency groups

Set violation penalties

Assign frequency groups to BTSs Set manual separations

Define forbidden channels

Set hopping mode Define allocation targets and start allocation

Check the results




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Optimizer can generate frequencies for new TRXs in BTSsNo plan is needed (close plan before starting)

Select BTSs, cells or sites on the Navigator, Map or Browser and usemenu Tools->Frequency Optimisation->Add New Frequency...

You can also use popup menus


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New Frequency: General Settings

New TRXs can be added toTCH or underlayer

Only non-hopping or BB-

hopping TRXsFrequency selection can bebased on

Optimisation cost function

InterferenceAssign Default Frequenciesiffrequency groups are notavailable or applicable

Select Interference type andseparation violation penaltiesin the Interference tab


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New Frequency: Interference Settings

Select Interference type

Violation penalties areexplained later in thismodule


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10 N oki a Si emens N et wor ks Presentation /PLe /23.8.2010


Select Target BTSs

In case of Master and Slave BTSs the user has to select thetargets


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New Frequency Results

Channel selection can be edited manually

Results are saved in the tool

To view and modify the results later selectTools->Frequency Optimisation->Cell Frequency Manager...

The results disappear after the new TRXs become actual


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Exercise

Create new frequencies for one site

Study the results when using different selection methods

Incoming cost, outgoing interference, etc.


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STU CHU CMSTU CHU CM

STU CHU CM

WDU

CTU

WDU

OMU OMU

M M

C CM U C CM UCLS

PDE

DX200

BSC PM database

MMRevery480ms

Rawdata

Interferencematrix

AutomaticOptimisation

AutomaticOptimisation Configuration

data

Algorithmparameters

User input

Measuring

New Plan

Configurato

r

Optimizer

Data Flow Example


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Select the scope





Assign frequency groups to BTSs Set manual separations


Set hopping mode

Define allocation targets and start allocation

Check the results




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Exercise check measurements

1. Measurements need to be activated in the network elements2. Check that all BCCHs have been measured:

Select an Interference Matrix

View the Interference Matrix (Show Set command) Open one BTS in the Interference Matrix

Select all BTSs under the selected BTS

List these selected BTSs to Browser

Check that all BCCHs are listed = have been measured


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Select the scope


Check that you have measurements needed for frequency optimisation

Start the Frequency Optimization tool Create frequency groups



Set manual separations


Set hopping mode





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Start Frequency Optimisation

Select the target object(s) from the Navigator, Map, orBrowser or use the active scope


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Select Interference Type

Select Interference Type (CIP + ARPor FEP)

CF and DAC measurements are needed for CIP and ARP

External interference comes from cells that have not beenidentified(not found in the CM database)


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Frequency Optimisation Tabs

Navigator Optimisation Statistics and Results


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Statistics

Check the amount of elements

Buffer area is automatically selected to include neighbor cells,second level neighbors and all measured cells


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Conflicts

ARP data: Tools->Network Statistics->Interference Matrices

KPIs: Tools->Network Statistics->Key Performance Indicators

Frequency Groups: Created in this tool

CIP data: Tools->Network Statistics->Interference MatricesSite Data: Correct in Antenna Data Editor or CM Editor


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Iterations

Iteration 1 -> OriginalKeep a clean starting point in Original

All parameters, settings, Frequency Groups and the allocation results arestored in the open iteration -> different allocation strategies

Only one iteration can be saved to a plan


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Select the scope



Start the Frequency Optimization tool

Create frequency groups





Set hopping mode





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Create Frequency Groups

Default Groups are based onthe current actual allocation

FGs are user specific anditeration specific

FGs can also be created andassigned manually

Frequency Groupsare stored whenthe results aresaved into the plan

All user's plans willuse the same(stored) FGsettings


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Selecting Frequency Groups

Select a frequency group in navigator (frequency band, TRX layer)

You can select all groups for editing and viewing by using Show menu


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Modifying Frequency Groups

Double click Channels columnTo add channels: choose from theleft and click >>

To remove channels: choose fromthe right and click


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Select the scope



Start the Frequency Optimization tool






Set hopping mode





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Separation Violation Penalties

Interference Scales multiply the values in the interference matrix

Outgoing adjacency target cells should not have the same

BCCH channel


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Select the scope








Set hopping mode


Check the results




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Assign a Frequency Group to a Layer

The selected frequency group will be assigned to all BTSs under the

selected layer


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Assign a Frequency Group to one BTS


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Select the scope








Set hopping mode


Check the results




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Manual Separations

In Navigator, open a pop-up menuand then select Edit ManualSeparations


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Select the scope








Set hopping mode


Check the results




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Define Forbidden Channels

Select Show->Scope BTSs

I F bidd Ch l


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Import Forbidden Channels

St i F O ti i ti


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Select the scope Add frequencies to new TRXs







Set hopping mode


Check the results



F H i S tti


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Frequency Hopping SettingsSelect Show->Scope BTSsand check Hopping Modes and configurations

Basebandor Synthesisedhopping

Cell hoppingor Site hopping

If synthesised hopping is selected for the specific TRX layer

Select Scope BSCs from the Navigator and check MALAllocation Mode

Allocateor Use Predefined

MA List Settings


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MA List Settings

Select Show->Layers

Simple mode list length = #TRX / Frequency Load

Complex mode

Select Show->MALsload

TRX

TCH

ff

Nblocking

N

trafficN )1( =



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Set hopping mode


Check the results



Allocation Parameters


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Allocation Parameters

AFP Parameters


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AFP Parameters

Optimisation== Fastwith minimum changes (improvements only)

ARP might be used in a good quality network (CIP ~ 0)

Average interferencedivides interference over the TRXs of a cell

Interference moved away from cells with high traffic or importance

BSIC Parameters


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BSIC Parameters

TSC = TrainingSequence Code (TRXparameter)

Normally TSC = BSICBCC

Optimize TSCTSC != BSIC BCC

if no BB hopping,

BSC >= S10,TRX Channel 0

Typenot MPBCCHor CPBCH

TSC optimisationneeded sometimes in2G - 3G handoverproblems

Allocation Progress


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Allocation Progress

Close after allocation



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optimisation






Set hopping mode


Check the results



Results


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Results

Interference Distribution


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Interference Distribution

Average Interference Distribution Graph for the Scope

Number of TRXs

Interference Probability

Channel Distribution


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Channel Distribution

Even distribution theoretically the bestDecimal numbers because of frequency hopping (see tooltip)

Cell Level Interference Graph


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Cell Level Interference Graph

Number of cells vs. Average Interference Probability (CIP)

Read the interference level from the Y-axis

X-axis then shows the number of cells that have higher interference than that

Separation Violations


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p

Note: It is not possible to reduce the number of violationsby changing the violation penalties

Frequencies need to be added or the separationrequirements loosened

Compare Allocations


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p

Different allocations can be compared against each otheror against the actual configuration



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y

Interference is theresultof the allocation

Choose Interference

Analysisor InterferenceDeltafor visualisation inDominance or in CellIcon

Adjust the parametersto get what you want



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y

If a plan is open Interference Analysis shows the planned situation

Interference Delta


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Interference Delta = Interference(plan) Interference(actual)

Frequency Visualisation


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Cell icons or dominance area colored according toBTS quality indicator BCCH or BCCH-BSIC combination

Select CELL parameter Frequency Channelsfor cell label

Frequency Reuse Display


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To find where a particular frequency or BCCH-BSICcombination is used

RF hopping TRXs not taken into account

Frequency Display


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optimisation






Set hopping mode


Check the results


Saving Results to Plan


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Only one iteration can be saved to plan

Frequency group settings saved also

Only open iteration can be saved

Save only to new plan or originally open plan

Exercise


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Create a new frequency plan for the selected BSC

How much lower is the interference on BCCH layer, or is it?

Exercise


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Visualise Interference Analysis and Delta for visible cells

Display the allocated frequencies in cell labels

Color cell icons according to the BCCH frequencies.

Use Frequency Reuse Visualisation to check your new plan

Summary


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Frequencies for new TRXs can be found with Optimizer

To create a new frequency plan select scope and use popup menuTools->Frequency Optimisation

Check the conflicts and make corrections if needed

Duplicate the first iteration, rename and open the duplicate

Create Frequency Groups

Modify the Separation Violation Penaltiesand defineManual Separations

Select allocation target and strategy and define the settings accordingly

Target BTSs, BSCs, Layers, MALs

Perform Frequency Optimisation with selected options

Compare iterations to each other and to actualSave one iteration into the plan

Verify the results on the Map and in the Browser

Document change history


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First version for Optimizer 3.0PLe1.023.8.2010

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04 gsm frequency optimisation opt 3.0

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