Scrambling Code Optimisation for WCDMA Cells OPT2.2 CD2

1 © Nokia Siemens Networks Presentation / PLe /30.3.2009For public use – IPR applies

NetAct Optimizer 2.2 CD2 BasicScrambling Code Optimisation for WCDMA Cells

2 © Nokia Siemens Networks Presentation / PLe / 30.3.2009For public use – IPR applies

Nokia Siemens Networks AcademyLegal notice

Intellectual Property RightsAll copyrights and intellectual property rights for Nokia Siemens Networks training documentation, product documentation and slide presentation material, all of which are forthwith known as Nokia Siemens Networks training material, are the exclusive property of Nokia Siemens Networks. Nokia Siemens Networks owns the rights to copying, modification, translation, adaptation or derivatives including any improvements or developments. Nokia Siemens Networks has the sole right to copy, distribute, amend, modify, develop, license, sublicense, sell, transfer and assign the Nokia Siemens Networks training material. Individuals can use the Nokia Siemens Networks training material for their own personal self-development only, those same individuals cannot subsequently pass on that same Intellectual Property to others without the prior written agreement of Nokia Siemens Networks. The Nokia Siemens Networks training material cannot be used outside of an agreed Nokia Siemens Networks training session for development of groups without the prior written agreement of Nokia Siemens Networks.


At the end of this module the trainee should be able to:Analyse, visualise and repair scrambling code collisionsSet the parameters and perform allocation of the

Primary DL Scrambling Code for the WCDMA cellsVisualise scrambling code re-use on the map

Module Objectives


Scrambling Code Optimisation for WCDMA Cells

How to view and fix scrambling code collisions?How to improve the scrambling code plan for the entire RNC?How to visualise scrambling code re-use?


Scrambling Code OptimisationSelect the scope from Navigator, Map or Browser and use popup menuIf multiple carriers are used in the network one has to be selected


Scrambling Code Tool View

Select Scrambling code collisions


Cell Y,scrambling code M

Cell 58, scrambling code 315

Cell 125,scrambling code 315

Cell X,scrambling code N

neighbor:

neighbor’sneighbor:


Finding the Collisions

Collision cells can be located on the Map and Navigator or listed in the Browser.


Visualising the Collisions on Map


Correcting the Collisions

The collisions are corrected only within the selected target cells (scope)Save to plan


Exercise

Check the collisions for the selected scope and carrier frequencyCorrect any collisions found and save the results in a plan



How to view and fix scrambling code collisions?How to improve the scrambling code plan for the entire RNC?How to visualise scrambling code re-use?


Forbidden CodesIf there are codes that cannot be used in the allocation• Create a new Forbidden Code Set and assign to the cells

Add a new groupSpecify a nameClick Codes column to add codes to group.


Forbidden Code Set

Select cells and assign the group to the cells using the popup menu


Edit System Defaults for Reuse of scrambling codes


Allocating New Scrambling Codes

New allocation: allocate totally new scrambling codes according to the settings

Fix collisions and violations: fix collisions taking the settings into account


Allocation Results

Save to a plan



How to view and fix scrambling code collisions?How to improve the scrambling code plan for the entire RNC?How to visualise Scrambling Code re-use?


Scrambling Code HistogramHistogram shows how many times a particular code or group has been used in the scope or in the network


Scrambling Code Re-use Visualisation

For clarity 2G cells may be hidden during the re-use visualisation

Note! The visualisationsettings for the Cell Icon show Scrambling code reuse


Scrambling Code Re-use VisualisationChanges in the parameter dialog automatically appliedClick a cell on the map to evaluate reuse for that cell


Exercise

Visualise Scrambling code re-useTry to find a code that has been used several times inside one RNCSee if you can find Scrambling code reuse Quality Indicatorfor Cell Icon in the visualisation settings


Summary

In WCDMA networks Primary DL scrambling code collisionscan cause HO problemsThere should not be the same scrambling code within the neighbors or neighbor's neighbors of any cell that use the same carrier frequencyCollisions can be fixed with OptimizerPrimary DL Scrambling code average re-use distance can be increased for entire RNCs• Forbidden codes can be specified for the cells or globally• The user specifies the minimum allowed distanceScrambling code re-use can be visualised• on a Histogram• on the Map


Document change history

Date Version Name Change comment

30.3.2009 1.0 PLe First version for Optimizer 2.2 CD2

Scrambling Code Optimisation for WCDMA Cells OPT2.2 CD2

Documents

Transcript of Scrambling Code Optimisation for WCDMA Cells OPT2.2 CD2