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8/3/2019 Kodar_RNO&DT_eng
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Predrag Radic
Vladica Kovacevic
Ivan Milovic
Kodar Engineering Ltd.
Belgrade, November 2011.
T HE PRINCIPLES OF „DRIVE TEST “ REALIZATION AND RADIO - PARAMETERS
OPTIMIZATION IN THE PROJECT OF MOBILE
RADIO BASE STATION NETWORK MODERNIZATION
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PURPOSE AND GOAL OF DRIVE TESTS AND OPTIMIZATION IN THE PROCESS OF NETWORK MODERNIZATION
RAN (Radio AccessNetwork) Swap:• New BSC/RNC controller
installation• New OSS system installation• Base stations swap
+ Possibly replacement:
• Transmission system• PS Core network (SGSN /
GGSN)• CS Core network (HLR,
MSC, MGW)
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KPI statistics of theexisting network on
the cluster level(Key Performance
Indicatiors)
KPI statistics of the
new installednetwork on the
cluster level
User experience KPIsof the existing
networkLink availability, speechquality, Web services(download, upload,
real-time streaming, ...)
User experienceKPIs of the newinstalled network
RAN (Radio AccessNetwork) Swap:• New BSC/RNC controllers
installation• New OSS system installation• Base stations swap
+ Possibly replacement:
• Transmission system• PS Core network (SGSN /
GGSN)• CS Core network (HLR,
MSC, MGW)
PURPOSE AND GOAL OF DRIVE TESTS AND OPTIMIZATION IN THE PROCESS OF NETWORK MODERNIZATION
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KPI statistics of theexisting network on
the cluster level(Key Performance
Indicatiors)
KPI statistics of the
new installednetwork on the
cluster level
RNO&
DT
RNO&
DT
User experience KPIsof the existing
networkLink availability, speechquality, Web services(download, upload,
real-time streaming, ...)
User experienceKPIs of the newinstalled network
Provide the same orbetter KPI statistics
Provide the same orbetter user
experience indicators
Notice and repairevery hardware/ software mistake
occured during swap
Achieve fully networkfunctionality during
swap
PURPOSE AND GOAL OF DRIVE TESTS AND OPTIMIZATION IN THE PROCESS OF NETWORK MODERNIZATION
RAN (Radio AccessNetwork) Swap:• New BSC/RNC controllers
installation• New OSS system installation• Base stations swap
+ Possibly replacement:
• Transmission system• PS Core network (SGSN /
GGSN)• CS Core network (HLR,
MSC, MGW)
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RAN Swap
EXISTING RAN NETWORK:
Mainly at least a 10 years ofexploatation, with upgrading
of Base stations andcontrollers from differentvendors, changing stuff inRNP/RNO team etc.
NEW RAN NETWORK:
Perfectly clear network insightwith:
1. Onsite hardware statedocumentation
2. Consistency anddocumentations of Data andRadio-parameters
3. Documentations andrelevancy of KPI Data
4. Detailed network ilustrationobtained by Drive tests
Among network hardware/ software modernization itself, swap
is excellent opportunity to fullyadjust and advance network,
documentation, databases, etc.
PURPOSE AND GOAL OF DRIVE TESTS AND OPTIMIZATION IN THE PROCESS OF NETWORK MODERNIZATION
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PROCESS OF SWAP REALIZATION
GeneralPreparation
Cluster SWAPPreparation
Cluster SWAPCluster
OptimizationCluster
Verification
1. General preparation2. Cluster swap preparation
3. Cluster swap
4. Cluster optimizaton
5. Cluster verification
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GENERAL SWAP PREPARATION
Radioparameters
mapping
Network parameter
dump
Radio parameters
description
Radio
parameters
description Cluster
defining
DT Cell data
Cell Traffic
Data
Transmission
Network
Design
Defining of target
KPIs as well asformulas for
calculating
Performancecounters
description
Performance
countersdescription
KPI description(formulas)
GeneralPreparation
Cluster SWAPPreparation
Cluster SWAPCluster
OptimizationCluster Verification
• Period of intense communication and information exchange with networkoperater
• Establishment of crucial conditions necessary for successful swap
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Radioparameters
mapping
Network parameter
dump
Radio parameters
description
Radio
parameters
description
GeneralPreparation
Cluster SWAPPreparation
Cluster SWAPCluster
OptimizationCluster Verification
Default
Non-default
Cell
Global
Relation
Conversion
Direct mapping
• VARIOUS „HANDOVER“ ALGORITHMS: Handover
parameters: hysteresis, offsets, thresholds etc
• VARIOUS HCS ALGORITHMS: Cell level and priority
parameters
• RADIO-UNITS WITH VARIOUS CHARACTERISTICS AND POWER SETTINGS: In order to achieve equal TOC power
• ALL OF THE OTHER „VENDOR-SPECIFIC“ PARAMETRS
AND ALGORITHMS.......
GENERAL SWAP PREPARATION
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Radioparameter
mapping
Network parameter
dump
Radio parameters
description
Radio
parameters
description
Defining of target
KPIs as well asformulas for
calculating
Performancecounters
description
Performance
countersdescription
KPI description(formulas)
GeneralPreparation
Cluster SWAPPreparation
Cluster SWAPCluster
OptimizationCluster Verification
OSS KPIs defining:
KPIs proper choice
KPI formulas mapping between two networks
Time frame choice (typically 1 – 3 weeks) and time samples during theday for KPIs collection („busy hour“, 24h, etc)
Type of counting KPIs: summary or averaged per day
Cluster
defining
DT Cell data
Cell Traffic
Data
Transmission
Network
Design
GENERAL SWAP PREPARATION
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Defining of target DT
KPIs
Radioparameters
mapping
Network parameter
dump
Radio parameters
description
Radio
parameters
description Cluster
defining
DT Cell data
Cell Traffic
Data
Transmission
Network
Design
Defining of
DT scenario
Defining of DT report
content
Defining of target
KPIs as well asformulas for
calculating
Performancecounters
description
Performance
countersdescription
KPI description(formulas)
GeneralPreparation
Cluster SWAPPreparation
Cluster SWAPCluster
OptimizationCluster Verification
GENERAL SWAP PREPARATION
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CLUSTER DEFINING
Cluster – collection of neighboring sites; usually 15 – 25
All DT and RNO activities during the swap are done on the cluster level During the cluster definition process the things that need to be taken into
acount:
Terrain (physical borders)
Traffic distribution (should be similar on all of the clusters)
Transmission lines (all of the sites should be on the same transmission line)
Logical urban zones borders Radio controller (BSC/RNC) responsibility
GeneralPreparation
Cluster SWAPPreparation
Cluster SWAPCluster
OptimizationCluster Verification
G C S C
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DEFINING OF TARGET DT KPIS AND SCENARIOS
In order to achieve high-quality Drive test it is important to defineappropriate DT scenario and KPIs to present in report
Mutually test impact:• If done at the same time some
tests can impact each other,for example:• HSDPA DL test has negative
impact on the scanned Ec/Io!
Dual mode test• Consider dual mode test
because:• Defining UMTS service zone• Defining samples where
inter-RAT handovers occur• It is necessary to quit the call
when inter-RAT handoverhappens and then after cellresellection to UMTS toestablish a new call
Static points• Traffic tests can be done in
motion or in static points.• Good practice is to do motion
traffic tests at the beginningof the project, and later toswitch to static tests in orderto utilise resources .
GeneralPreparation
Cluster SWAPPreparation
Cluster SWAPCluster
OptimizationCluster Stability
List of DTKPIs andservices
Static testparticipationdetermining
Drive test andStatic testscenarios
G l Cl SWAP Cl
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DT SCENARIO EXAMPLE
GeneralPreparation
Cluster SWAPPreparation
Cluster SWAPCluster
OptimizationCluster Verification
13
Description of the
test used to collectKPIs
LIST ofexported
KPI / IE
Test softwaresequence description
Test type Test Description KPIDevice
number
Device
typeSequence description
Strongest Scanned GSM 900 BCCH ARFCN
Strongest Scanned GSM 1800 BCCH ARFCN
Strongest Scanned GSM 900 RxLev
Strongest Scanned GSM 1800 RxLevRxLev Sub / Full
BCCH ARFCN
RxQual Sub / Full
SQI
Time Advance
Call Setup Success Rate
Call Drop Rate
Handover Success Rate
FTP UL Session Application ThroughputFTP UL RLC Throughput
FTP DL Session Application throughput
FTP DL RLC Throughput
PDP Context Activation Success Rate
Average PDP Context Activation Time
PS Session Drop rate
Ping Delay
Ping Number
Ping Packet Loss
Drive test
(E)GPRS FTP Upload
MS3 / DC3 Modem
1.) UE locked on 2G
2.) 60 s FTP Upload
3.) 10s wait
4.) 60s FTP Download
5.) 10s wait
6.) Ping 10 times
7.) 10s wait
8.) Repeat
(E)GPRS FTP
Download
(E)GPRS PDP Context
(E)GPRS Ping Service
Drive test GSM RF Coverage MS1 Scanner1.) GSM Scan All Operator's
BCCH / BSIC
Drive test GSM Voice Short Call MS2 Phone1.) UE locked on 2G
2.) 50s duration + 10s idle
G l Cl t SWAP Cl t
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The differencies intransmitting-recieving
characteristics of differentdevices
On the test set deviceallocation have to be the
same
DT EQUIPMENT CONFIGURATION On the basis ofdeterminated scenario, the
final equipmentconfiguration will be defined
Hardware problems impacton results have to beminimized:
GeneralPreparation
Cluster SWAPPreparation
Cluster SWAPCluster
OptimizationCluster Verification
The same test set have
to be used(reference,validation, acceptance)
on the cluster
Possible degradation of thereceiving characteristics of
device during the time!
Periodically test of thereceived signal strength for
all of the the devices
G l Cl t SWAP Cl t
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DT REPORT CONTENT DEFINING – INFORMATION ELEMENTS DISPLAY DT report form is designed especially for the project in accordance with agreed IE and
KPIs with operater. Standard DT results display:
RxQual - 2G
Interval PDF [#] PDF [%] CDF [#] CDF [%]
0 <= x < 5 24564 99.1 24564 99.1
5 <= x < 6 141 0.6 24705 99.6
6 <= x < 7 57 0.2 24762 99.9
7 <= x < 7 33 0.1 24795 100.0
Samples (#) 24,795
Average 0.2
GeneralPreparation
Cluster SWAPPreparation
Cluster SWAPCluster
OptimizationCluster Verification
MAP
STATISTICS
GRAPH
General Cluster SWAP Cluster
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KPI values are obtained:
1. Statisticaly, from „information elements“, where value may be: a) Averaged from all of the samples
b) Sample percentage with the IE value above/under defined border value
2. Mathematical expression of events:
GeneralPreparation
Cluster SWAPPreparation
Cluster SWAPCluster
OptimizationCluster Verification
16
Average
value
Rate
value
Average
value
Rate
value
GSM RxLev Sub (dBm) (#samples_RxLev>=-85dBm)/(#samples) -74.5 98.60 % -75.3 98.30 %
GSM RxQual Sub (#samples_RxQual<=5)/(#samples) 0.2 99.60 % 0.2 99.50 %UMTS CPICH RSCP (dBm) (#samples_RSCP>=-95dBm)/(#samples) -81.3 89.90 % -80.9 90.20 %
UMTS CPICH Ec/Io (dB) (#samples_Ec/Io>=-11dB)/(#samples) -5.4 99.40 % -5.1 99.60 %
Mode KPI (unit) Formula
Reference Acceptance
Pass?
Failures
count
Rate
value
Failures
count
Rate
value
GSM Call setup success rate 100 * (#Call Setup / #Call Attempt) 12 97.30 % 8 97.90 %
GSM Call drop rate 100 * (#Dropped Call / #Call Setup) 4 98.80 % 3 98.90 %
GSM Handover success rate 100 * (1 - Handover failures / Handover attempts ) 2 99.00 % 2 99.10 %
GPRS PS Attach success rate 100 * (1 - #PS Attach Failure / #PS Attach) 0 100.00 % 0 100.00 %
GPRS PDP activation success rate
(1 - #PDP Context Activation Failure / #PDP Context
Activation) 0 100.00 % 0 100.00 %
GPRS PDP session drop rate 100 * (1- PDP dropped connections / #Session Start) 0 100.00 % 0 100.00 %
UMTS Call setup success rate 100 * (#Call Setup / #Call Attempt) 4 98.70 % 0 100.00 %
UMTS Call drop rate 100 * (#Dropped Call / #Call Setup) 2 99.30 % 1 99.50 %
UMTS Handover fro UTRAN success rate100 * (1 - #Handover From UTRAN failure /#Handover From UTRAN) 0 100.00 % 0 100.00 %
Pass?Mode KPI Formula
Reference Acceptance
DT REPORT CONTENT DEFINING – INFORMATION ELEMENTS DISPLAY
General Cluster SWAP Cluster
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DT REPORT CONTENT DEFINING – ADVANCED
1. Unwanted events detailed display
GeneralPreparation
Cluster SWAPPreparation
Cluster SWAPCluster
OptimizationCluster Verification
17
# Lat Lon Time Logfile Event Event Info
Last Best
Server Name
Last Best
Server RSCP
Last Best
Server EcIo
Last UE
TxPower
Dist from
Serving Cell
1 44.49473 20.25293 15:43:06 Test_01 Blocked Cal l
Block type: No Immediate
Assignment. , call time:
10297 ms Cell_1 -84.3 -11.3 33 8
2. Geographical display:
3. Layer 3 signalization display(immediatelly before bad event)
UE RNC
RRC Connection Request
← RRC Connection Setup
RRC Connection Setup
Complete
CM Service Request
← Authentication Request
General Cluster SWAP Cluster
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It is possible to present additional analysis of the unwanted network performances,like: Pilot Pollution Missing Neighbour
The data are combined from scanner (neighbour signal strength and quality) and fromtest phone (BA list) for GSM
For detailed analyse it can be used predefined „Cell & Neighbors Data“
Ping-pong handovers
Polluter Cell
Name SC
Polluted
samples (#)
Detected
Samples (#)
Polluted
samples (%)HN3395 299 1814 15986 11.3
HN3394 291 1675 8557 19.6
TI3345 227 1122 7482 15.0
TI3346 235 1003 7136 14.1
TI3340 243 773 6094 12.7
TI3147 178 708 5450 13.0
TI3344 219 696 4718 14.8
TI3050 18 650 4601 14.1
HN3398 315 638 3660 17.4
HN3430 435 628 5899 10.6
HN3422 419 520 3071 16.9
HN3396 307 513 3550 14.5
HN3390 267 493 3714 13.3
TI3148 186 482 5138 9.4
11.3
19.615.0 14.112.7 13.0 14.8 14.1
17.4
10.616.9 14.513.3
9.4
0.0
20.0
40.0
60.0
80.0
H N 3 3 9 5
H N 3 3 9 4
T I 3 3 4 5
T I 3 3 4 6
T I 3 3 4 0
T I 3 1 4 7
T I 3 3 4 4
T I 3 0 5 0
H N 3 3 9 8
H N 3 4 3 0
H N 3 4 2 2
H N 3 3 9 6
H N 3 3 9 0
T I 3 1 4 8
P o l l u t e d s a m p l e s ( % )
Highest Polluter Cells
GeneralPreparation
Cluster SWAPPreparation
Cluster SWAPCluster
OptimizationCluster Verification
DT REPORT CONTENT DEFINING – ADVANCED
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General Cluster SWAP Cluster
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DT ROUTE DEFINING
DT route should cover all of the cells serving zones as well as mainroads
Usual route length: 5 – 15 km per site→ about 200 km per cluster
If cell level analyse is needed, for example „Missing Neighbors“ and„Pilot Pollution“ in urban zones, route should cover the majority of streetsbecause of statistically relevance of result data.
GeneralPreparation
Cluster SWAPPreparation
Cluster SWAPCluster
OptimizationCluster Verification
• DT route have to be identical inevery repeated test.
• Because of handover hysteresiseffect there is a need foridentical route direction in everyof repeated tests.
Exceeding of the servicezone (UMTS test):Route have to be insideexpected UMTS servicezone, in order KPIstatistics to be relevant
General Cluster SWAPC S
ClusterC
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REFERENCE DRIVE TEST
GeneralPreparation
Cluster SWAPPreparation
Cluster SWAPCluster
OptimizationCluster Verification
R e
f e r e n c e
D T
Collection of DT KPIs on the existing network
Notice of mistakes in the DT Cell Data file
Notice of hardware mistakes/problems whichcan be solved during the swap-a (mixed
feeders, sectors)
Notice of problematic areas where specialattention should be payed after the swap
ReferenceDT Report
It is performed after cluster parameters freezing announcement in order to
collect reference DT KPIs
Exact day (working day/weekend)and period during the day when DTis performed have to be repeatedon other test on that cluster, in orderto proper compare the results
General Cluster SWAPCl SWAP
ClusterCl V ifi i
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NEIGHBOURING RELATIONS COMMAND SCRIPTS GENERATION
Actions during the swap of base station:
• Reconfiguration of neighbouring relations from and toswapped cell
• Define/change definitions of external cells
Important to provide:
• Independency from previous system; no need for any
changes• Fully functionality just after new cell become active
• Independency from swap cell order and dynamics
GeneralPreparation
Cluster SWAPPreparation
Cluster SWAPCluster
OptimizationCluster Verification
General Cluster SWAPCl t SWAP
ClusterCl t V ifi ti
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OUTGOING
neighbouringrelations scripts
generation
Cell &Neighbors
Design Data
Cell Name Modification
Table
SwappedSites List
BSC/RNCDumps
INCOMINGneighbouring
relations scriptsgeneration
RELATIONS CONFIGURATION – SCRIPT MAKER
Cluster sites swap
• Previous detailed validation of input data• External cell adding/ modification• Defining of externall cell index in order with
mobile operators demands• Cell names harmonization• Neighbouring names adding
• External cell modification/ removing
• Redirection ofneighbouring relations
from old to new cell
• Software tool internally developed for automaticallygeneration of command scripts and network parameters
consistency checking• Developed for needs of Telenor Renovation project,
adaptable for any similar project• Provides command generation and control if
neighbouring relations parameters are correctly set
GeneralPreparation
Cluster SWAPPreparation
Cluster SWAPCluster
OptimizationCluster Verification
General Cluster SWAPCl t SWAP
ClusterCl t V ifi ti
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SCRIPT MAKER – CHECKING
Initial scriptgeneration
Swap scriptgeneration
Checkings
• Check if external cells parameters are correlated with initial
parameters
• Check if neighbouring relations parameters are correlatedwith initial parameters
• Check if parameters with no default values are correct set
• Unexisting cell finding
• Asymmetrical neighbouring relations finding
• ...
GeneralPreparation
Cluster SWAPPreparation
Cluster SWAPCluster
OptimizationCluster Verification
General Cluster SWAPCluster SWAP
ClusterCluster Verification
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ChangeRequest
Determination ifreference KPI
values are reached
OPTIMIZATION CLUSTER PROCESS
Functionality checkand urgent problem
solving
Ge e aPreparation
C uste SPreparation
Cluster SWAPC uste
OptimizationCluster Verification
Daily OSS KPI monitoring
Optimization andradio parameters
tuning
Freezing clusterparameters
AcceptanceOSS KPIscollection Acceptance
OSS & DTReports
Validation drivetest
Troubleshootingdrive tests
Acceptancedrive test
General Cluster SWAPCluster SWAP
ClusterCluster Verification
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Functionality checkand urgent problem
solving
Preparation PreparationCluster SWAP
OptimizationCluster Verification
Daily OSS KPI monitoring
Basic functionalitycheck
• Voice traffic• Data traffic• Handovers
Parameterscheck
• Basic cellparameters• Neighbouring
relations
Hardware check
• Critical alarms• High VSWR• Crossed/mixed
feeders/cells• TMA device check
Validation drivetest
OPTIMIZATION CLUSTER PROCESS
General Cluster SWAPCluster SWAP
ClusterCluster Verification
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1. MIXED CELLS (TX BRANCHES)
Preparation PreparationCluster SWAP
OptimizationCluster Verification
2. TWO SC (BOTH TX BRANCHES) IN THE SAME AZIMUTH
3. MIXED RX BRANCHES
CROSSED CELLS / FEEDERS
General Cluster SWAPCluster SWAP
ClusterCluster Verification
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ChangeRequest
Preparation PreparationCluster SWAP
OptimizationCluster Verification
Daily OSS KPI monitoring
Optimization andradio parameters
tuning
Validation drivetest
Troubleshootingdrive tests
DT result analysis
• Cells with unstable service zone
• Zones with quality degradation
• Zones with reduced data traffic
• Overshooting cells
• Bad events analyzing
• Layer 3 signaling detailed analyze
OPTIMIZATION CLUSTER PROCESS
General Cluster SWAPCluster SWAP
ClusterCluster Verification
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ChangeRequest
Preparation PreparationCluster SWAP
OptimizationCluster Verification
Daily OSS KPI monitoring
Optimization andradio parameters
tuning
Validation drivetest
Troubleshootingdrive tests
Optimization and radio parameterstuning
• Congestion problems solving and traffic
optimization:• Cell traffic distribution
• Technology traffic distribution
• Interference problems solving
• Neighbour optimization
• The „worst cell“ analyze and problem
solving
OPTIMIZATION CLUSTER PROCESS
General Cluster SWAPCluster SWAP
ClusterO
Cluster Verification
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TRAFFIC DISTRIBUTION OPTIMIZATION Basic tasks:
Solving the „new noticed“ traffic congestion
Provide optimal traffic balance Comparing traffic distribution per cell before and after swap – visual
analysis and possible problem noticing
Detailed analyse of KPIs, serving zones comparision, ...
Possible actions (GSM):
Cell Reselectionparameters change
Handover parameterschange
Direct Retry to „switch on“
Half Rate Treshold tuning
Hardware TRXreallocation between cells
Preparation PreparationCluster SWAP
OptimizationCluster Verification
GeneralP i
Cluster SWAPP i
Cluster SWAPCluster
O i i iCluster Verification
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NEIGHBOUR OPTIMIZATION
OSS tools enable finding of missed 2G neighbours from BA2 list, as well as all of
missing 3G neighbours Drive test analyse: Enables finding of missed ARFCNs in BA2 list, as well as all of
missing 3G neighbours
Preparation PreparationCluster SWAP
OptimizationCluster Verification
Map display of missingneighbours, geographicalpresentation is desirable
Automated scripts generation byusing of Script Maker
GeneralP ti
Cluster SWAPP ti
Cluster SWAPCluster
O ti i tiCluster Verification
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CLUSTER VERIFICATION
Preparation PreparationCluster SWAP
OptimizationCluster Verification
Clusteroptimization
(couple weeks)
PreliminaryAcceptance
Certificate
FinalAcceptance
Certificate
SWAP SUCCESFULLYFINISHED
Clusterverification
(couple months)