04 gsm frequency optimisation opt 3.0
TRANSCRIPT
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NetAct Optimizer 3.0 for GSM
GSM Frequency Optimisation
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Nokia Siemens Networks
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can use the Nokia Siemens Networks training material for their own personal self-developmentonly, those same individuals cannot subsequently pass on that same Intellectual Property toothers without the prior written agreement of Nokia Siemens Networks. The Nokia SiemensNetworks training material cannot be used outside of an agreed Nokia Siemens Networkstraining session for development of groups without the prior written agreement of NokiaSiemens 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
Add frequencies to new TRXs
Check that you have measurements needed for frequency
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
Save and provision the frequency plan
Steps in Frequency Optimisation
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Add frequencies to new TRXs
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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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
Add frequencies to new TRXs
Check that you have measurements needed for frequency
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
Save and provision the frequency plan
Steps in Frequency Optimisation
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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
Add frequencies to new TRXs
Check that you have measurements needed for frequency optimisation
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 Optimisation
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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
Add frequencies to new TRXs
Check that you have measurements needed for frequency optimisation
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 Optimisation
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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
Add frequencies to new TRXs
Check that you have measurements needed for frequency optimisation
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 Optimisation
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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
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
Save and provision the frequency plan
Steps in Frequency Optimisation
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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
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
Save and provision the frequency plan
Steps in Frequency Optimisation
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Manual Separations
In Navigator, open a pop-up menuand then select Edit ManualSeparations
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Select the scope
Add frequencies to new TRXs
Check that you have measurements needed for frequency
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
Save and provision the frequency plan
Steps in Frequency Optimisation
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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
Check that you have measurements needed for frequency
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
Save and provision the frequency plan
Steps in Frequency Optimisation
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( =
Steps in Frequency Optimisation
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Select the scope Add frequencies to new TRXs
Check that you have measurements needed for frequency
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
Save and provision the frequency plan
Steps in Frequency Optimisation
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
Steps in Frequency Optimisation
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Select the scope Add frequencies to new TRXs
Check that you have measurements needed for frequency
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
Save and provision the frequency plan
Steps in Frequency Optimisation
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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Different allocations can be compared against each otheror against the actual configuration
Interference Analysis
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Interference is theresultof the allocation
Choose Interference
Analysisor InterferenceDeltafor visualisation inDominance or in CellIcon
Adjust the parametersto get what you want
Interference Analysis
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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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Steps in Frequency Optimisation
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Select the scope Add frequencies to new TRXs
Check that you have measurements needed for frequency
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
Save and provision the frequency plan
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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