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NetAct Optimizer 3.1 CD2 for GSM
GSM Frequency Optimization
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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
synthesized (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 optimization
Import forbidden channels
Start the Frequency Optimization tool
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
Save and provision the frequency plan
Steps in Frequency optimization
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Interference Analysis
Before starting the Frequency optimization it is useful to find the worst interferers that cause problems over a long distance.
These problem cells should be treated first and new measurements run.
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Select the scope
Add frequencies to new TRXs
Check that you have measurements needed for frequency optimization
Import forbidden channels
Start the Frequency Optimization tool
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
Save and provision the frequency plan
Steps in Frequency optimization
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Add frequencies to new TRXs Optimizer can generate frequencies for new TRXs in BTSs
No plan is needed (close plan before starting)
Select BTSs, cells or sites on the Navigator, Map or Browser and use menu Tools->Frequency Optimization->Add New Frequency
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New Frequency: General Settings
New TRXs can be added to TCH or underlayer
Only non-hopping or BB- hopping TRXs
Frequency selection can be based on
optimization cost function
Interference
Assign Default Frequencies if frequency groups are not available or applicable
Select Interference type and separation violation penalties in the Interference tab
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New Frequency: Interference Settings
Select Interference type
Violation penalties are explained later in this module
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New Frequency: Select Target BTSs
In case of Master and Slave BTSs the user has to select the targets
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New Frequency: Select Target BTSs
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New Frequency Results
To view and modify the results later select
Tools->Frequency Optimization->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
CCMU CCMUCLS
PDE
DX 200
BSC PM database
MMR every 480ms
Raw data
Interference matrix
Automatic optimization
Configuration data
Algorithm parameters
User input
Measuring
New Plan
Configurator
Optimizer
Data Flow Example
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Select the scope
Add frequencies to new TRXs
Check that you have measurements needed for frequency optimization
Import forbidden channels
Start the Frequency Optimization tool
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
Save and provision the frequency plan
Steps in Frequency optimization
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Exercise check measurements
1. Measurements need to be activated in the network elements
2. 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
Add frequencies to new TRXs
Check that you have measurements needed for frequency optimization
Import forbidden channels
Start the Frequency Optimization tool
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
Save and provision the frequency plan
Steps in Frequency optimization
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Import Forbidden Channels
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Import Forbidden Channels
Examples for adding and removing forbidden channels:
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Import Forbidden Channels
Forbidden channels need to be imported before starting Frequency Optimization.
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Select the scope
Add frequencies to new TRXs
Check that you have measurements needed for frequency optimization
Import forbidden channels
Start the Frequency Optimization tool
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
Save and provision the frequency plan
Steps in Frequency optimization
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Start Frequency optimization
Select the target object(s) from the Navigator, Map, or Browser or use the active scope
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Select Interference Type
Select Interference Type (CIP + ARP or FEP)
External interference comes from cells that have not been identified (not found in the CM database)
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Frequency Optimization Tabs
Navigator Optimization 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 Matrices
Site Data: Correct in Antenna Data Editor or CM Editor
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Iterations
Iteration 1 -> Original
Keep a clean starting point in Original
All parameters, settings, Frequency Groups and the allocation results are stored in the open iteration -> different allocation strategies
Only one iteration can be saved to a plan
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Select the scope
Add frequencies to new TRXs
Check that you have measurements needed for frequency optimization
Import forbidden channels
Start the Frequency Optimization tool
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
Save and provision the frequency plan
Steps in Frequency optimization
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Create Frequency Groups
Default Groups are based on the current actual allocation
Frequency Groups are user specific and iteration specific
Frequency Groups can also be created and assigned manually
Frequency Groups are stored when the results are saved into the plan
All user's plans will use the same (stored) Frequency Group settings
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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 column
To add channels: choose from the left and click >>
To remove channels: choose from the right and click
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Select the scope
Add frequencies to new TRXs
Check that you have measurements needed for frequency optimization
Import forbidden channels
Start the Frequency Optimization tool
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
Save and provision the frequency plan
Steps in Frequency optimization
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Separation Violation Penalties
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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
Add frequencies to new TRXs
Check that you have measurements needed for frequency optimization
Import forbidden channels
Start the Frequency Optimization tool
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
Save and provision the frequency plan
Steps in Frequency optimization
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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
Add frequencies to new TRXs
Check that you have measurements needed for frequency optimization
Import forbidden channels
Start the Frequency Optimization tool
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
Save and provision the frequency plan
Steps in Frequency optimization
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Manual Separations
In Navigator, open a pop-up menu and then select Edit Manual Separations
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Select the scope
Add frequencies to new TRXs
Check that you have measurements needed for frequency optimization
Import forbidden channels
Start the Frequency Optimization tool
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
Save and provision the frequency plan
Steps in Frequency optimization
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Define Forbidden Channels
Select Show->Scope BTSs
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Select the scope
Add frequencies to new TRXs
Check that you have measurements needed for frequency optimization
Import forbidden channels
Start the Frequency Optimization tool
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
Save and provision the frequency plan
Steps in Frequency optimization
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Frequency Hopping Settings Select Show->Scope BTSs and check Hopping Modes and configurations
Baseband or Synthesized hopping
Cell hopping or Site hopping
If synthesized hopping is selected for the specific TRX layer
Select Scope BSCs from the Navigator and check MAL Allocation Mode
Allocate or Use Predefined
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Select the scope
Add frequencies to new TRXs
Check that you have measurements needed for frequency optimization
Import forbidden channels
Start the Frequency Optimization tool
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
Save and provision the frequency plan
Steps in Frequency optimization
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Allocation Parameters
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AFP Parameters optimization == Fast with minimum changes (improvements only)
Average interference divides interference over the TRXs of a cell
Interference reduced from cells with high traffic or importance
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BSIC Parameters
TSC = Training Sequence Code (TRX parameter)
TSC must be the same as BSIC BCC
1.With BCCH TRX
2. When Baseband hopping is in use
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HSN Parameters
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Allocation Progress
Close after allocation
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Select the scope
Add frequencies to new TRXs
Check that you have measurements needed for frequency optimization
Import forbidden channels
Start the Frequency Optimization tool
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
Save and provision the frequency plan
Steps in Frequency optimization
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Results
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Results : Planned channels
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Interference Distribution
Average Interference Distribution Graph for the Scope
Number of TRXs
Interference Probability
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Channel Distribution
Even distribution theoretically the best
Decimal numbers because of frequency hopping (see tooltip)
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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
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Separation Violations
Note: It is not possible to reduce the number of violations by changing the violation penalties
Frequencies need to be added or the separation requirements loosened
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Compare Allocations
Different allocations can be compared against each other or against the actual configuration
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Interference Analysis
Interference is the result of the allocation
Choose Interference Analysis or Interference Delta for visualization in Dominance or in Cell Icon
Adjust the parameters to get what you want
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Interference Analysis
If a plan is open Interference Analysis shows the planned situation
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Interference Delta
Interference Delta = Interference(plan) Interference(actual)
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Frequency Visualization
Cell icons or dominance area colored according to BTS quality indicator BCCH or BCCH-BSIC combination
Select CELL parameter Frequency Channels for cell label
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Frequency Reuse Display
To find where a particular frequency or BCCH-BSIC combination is used
RF hopping TRXs not taken into account
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Frequency Display
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Select the scope
Add frequencies to new TRXs
Check that you have measurements needed for frequency optimization
Import forbidden channels
Start the Frequency Optimization tool
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
Save and provision the frequency plan
Steps in Frequency optimization
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Saving Results to Plan
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
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Exercise
Create a new frequency plan for the selected BSC
How much lower is the interference on BCCH layer, or is it?
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Exercise
Visualize 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 Visualization to check your new plan
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Summary
Frequencies for new TRXs can be found with Optimizer
To create a new frequency plan select scope and use popup menu Tools->Frequency optimization
Check the conflicts and make corrections if needed
Duplicate the first iteration, rename and open the duplicate
Create Frequency Groups
Modify the Separation Violation Penalties and define Manual Separations
Select allocation target and strategy and define the settings accordingly
Target BTSs, BSCs, Layers, MALs
Perform Frequency optimization with selected options
Compare iterations to each other and to actual
Save one iteration into the plan
Verify the results on the Map and in the Browser