Tijmen Botma - Hören Lesen Spielen Book 2Full description
ISO 17025 New CD2
NetA tAct ct Opt ptim imiz ize er 2.2 CD2 Ba Basi sic c Scrambling Code Opti Optimis misa ation for WCDMA Cells Cells
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Module Objectives At the end of this module the trainee should be able to: Analyse, visualise and repair scrambling code collisions Set the parameters and perform allocation of the Primary DL Scrambling Code for the WCDMA cells Visualise scrambling code re-use on the map
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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?
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Scrambling Code Optimisation Select the scope from Navigator, Map or Browser and use popup menu If multiple carriers are used in the network one has to be selected
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Scrambling Code Tool View
Select Scrambling code collisions
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neighbor’s neighbor: Cell 125, neighbor:
scrambling code 315
Cell 58, scrambling code 315 Cell X, scrambling code N
Cell Y,
scrambling code M
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Finding the Collisions Collision cells can be located on the Map and Navigator or listed in the Browser.
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Visualising the Collisions on Map
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Correcting the Collisions The collisions are corrected only within the selected target cells (scope) Save to plan
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Exercise Check the collisions for the selected scope and carrier frequency Correct any collisions found and save the results in a plan
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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?
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Forbidden Codes If there are codes that cannot be used in the allocation • Create a new Forbidden Code Set and assign to the cells
Add a new group
Specify a name Click Codes column to add codes to group. For public u
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Forbidden Code Set
Select cells and assign the group to the cells using the popup menu
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Edit System Defaults for Reuse of scrambling codes
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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
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Allocation Results Save to a plan
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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?
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Scrambling Code Histogram Histogram shows how many times a particular code or group has been used in the scope or in the network
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Scrambling Code Re-use Visualisation For clarity 2G cells may be hidden during the re-use visualisation
Note! The visualisation settings for the Cell Icon show Scrambling code reuse
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Scrambling Code Re-use Visualisation Changes in the parameter dialog automatically applied Click a cell on the map to evaluate reuse for that cell
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Exercise Visualise Scrambling code re-use Try to find a code that has been used several times inside one RNC See if you can find Scrambling code reuse Quality Indicator for Cell Icon in the visualisation settings
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Summary In WCDMA networks Primary DL scrambling code collisions can cause HO problems There should not be the same scrambling code within the neighbors or neighbor's neighbors of any cell that use the same carrier frequency Collisions can be fixed with Optimizer Primary 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 distance Scrambling code re-use can be visualised • on a Histogram • on the Map For public u
