GSM Adjacency Optimisation

1 Nokia Siemens Networks OS86654EN53GLA0

NetAct Optimizer 3.0 for GSM

GSM Adjacency Optimisation


Nokia Siemens Networks Academy

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

Edit the common adjacency optimisation parameters for a

separate deletion or creation of adjacencies

Set the required parameters for the automatic measurement-

based adjacency optimisation

Perform adjacency optimisation

Module Objectives



How can I start the measurement-based adjacency

optimisation?

How can I

find the unused (unnecessary) adjacencies (deletion plan)?

find the missing adjacencies (creation plan)?


Prerequisites

Invalid adjacencies fixed

Antennas defined for every cell

Interference matrix available

Adjacency Optimisation KPIs available for Adjacencies

Adjacency Constraints have been created or imported

Adjacency templates have been created for each object type

Template assignment rules have been created


Methods and Startup Creation based on IM values, deletion based on ADCE KPIs

Check the KPI date and summarisation level

Select target objects from the Navigator, Map or Browser


Starting GSM Adjacency Optimisation

Only ADCEs selected for measurement-based GSM adjacency optimisation

CIP or FEP can also be selected if available

Check the retrieved IM sets and priorities


Adjacency Optimisation Tool View




optimisation?

How can I




Common Parameters

Bidirectional optimisation (recommended)

Creation and deletion of adjacencies into and out from scope allowed (recommended for small scopes)

Check maximum and minimum Adjacency List Lengths

Changes to adjacencies between frequency bands can be disabled

Frequency band specific list length settings can be enabled


Deletion Options for All Adjacency Types

Deleting outgoing adjacencies to foreign target cells can be allowed

Adjacencies without measurements will have 0 values for KPIs and are deleted


Deletion Parameters for ADCE

Bidirectional deletion requires at least one bad value in both directions

Additional conditions can be used to avoid deleting adjacencies in low traffic cells


Adjacency Deletion

Start optimisation


Detailed Results on Deleted

Info column shows the creation/deletion reason

Include Change column defines the results to be saved in the plan


Saving the Results

The results must be saved to the plan

Save is possible only to the plan that is open when Adjacency Optimisation starts, or to a plan that is created after pressing Save

After the save the results can be listed to Browser or shown on the map


Exercise

Check and set Common parameters

Set Deletion parameters and start the optimisation

View the results and check different views in the Adjacency Browser

Change parameters and run again

Save the results into your plan




optimisation?

How can I




Creation Options for All Adjacency Types

Creating BCCH and BCCH-BSIC collisions can be allowed if Frequency Optimisation is done in the same plan

Normally BCCH or BCCH-BSIC collisions are not allowed

If there are existing collisions in the network no new adjacencies are created for those cells unless collisions are allowed


Creation Thresholds

Bidirectional creation requires good values in the outgoing direction

25 RXLEV = -96 dBm ( -95dbm)

Theta angle limitation not necessary (because of the measurements)


Adjacency Optimisation

Start optimisation. Before starting, check that Deletion is not selected.


Detailed Results on Created

Info column shows the creation/deletion reason

Include Change column defines results for the save


Results

Save the results

Locate on Map or List to Browser to check the templates

You can select all by pressing Ctrl-A


Exercise

Check and set Common parameters

Uncheck Delete Adjacencies box in the Deletion tab

Set Creation parameters and find the missing adjacencies in your scope

View the results in the Adjacency Browser

Change parameters and run again

Save the results into your plan


Summary

Prerequisites

Site assignments and Antennas correctly defined

Adjacency templates and template assignment rules defined

Adjacency Constraints defined

Measurement-based deletion of GSM adjacencies Common Parameters

Deletion based on KPI values

Measurement-based creation of GSM adjacencies

Common Parameters

Creation based on Interference Matrix values

Results saved in to the plan Plan that is open when the tool is started

Plan that is created after pressing the Save button

After the save the results can be located on the Map and listed to the Browser

GSM Adjacency Optimisation

Documents

gsm gsm adjacency optimisation

adjacency templates

creation of adjacencies

deletion of adjacencies

startup creation

separate deletion

slide presentation material

required parameters