analyze_optimization process.pdf
TRANSCRIPT
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Objective & Aims
Procedure flow chart
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Analysis objective
Our main objective is to optimize the network by analysis the
.
Aims of the analysis phase:
• Identified the problem encountered during drive test
• Investigate and verifying the cause of the problem
• Provide solution/recommendation to solve the problem
Improve RF coverage
Reduce call drop rate
Reduce blocked call
Increase system capacity us so an over ac or
Parameter Tuning
Control Interference
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Analysis objective
Nemo Analyzer or Playback would be used for Uu log analysis
c x wou e use or canne og ana ys s
Alarm history and PM counter would be extracted from OSS
• Scanner data is used for RF Coverage/Cell dominance
optimization (L1 analysis)
Nemo Analyer or Playback:• UE log data is used for Call Event failure analysis
rop an a a or a a a
Hand-Over/Neighbor list Optimization
Alarm Histor :• Identify cell status during DT
PM Counters:
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• Verify signaling message within network
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Analysis tools
NEMO ACTIX OTHERS
Field Measurement
Tool (FMT) for data
Superstream
multiple data file.
MapInfo for
presentation, driveco ec on.
Playback Function
allows analysis of
enera e ,
statistics and report
based from pre
es rou e crea ng,
customizing events.
Excel workbookDrive
.
Show Call eventsand sequence.
.
Analyze Call eventsand sequence.
.Data
msgs.
based on RSCP and
Ec/No of desired
.
Shows Layer 3
msgs.
Etc.
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NEMO window
Scanner RSCP
& EcNo
UE’s active &
monitor RSCP
UE’s active &
monitor EcNo
Parameter
values to see: etc
SF, RRC state,
BLER, TX
power, CellID
and many more.
Layer 3 and
Map Window:
displays data in
drive route,
shows position
Values & Window to see when analyzing log file. With the RSCP, EcNo,
RRC message
window
to serving cell(s)
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message window, we can start to analyze the log file.
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Analysis procedure
1
of DT tool &
route map
ata co ect on
during drive
testing
Post processing
data
Analysis of
problem
Solution and
2
recommendation
.
2. Isolate the reason3
Implementation
.
recommendation
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er y ng r ve es
again
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Analysis procedure
Identify the problem
• Using either NEMO or ACTIX to post process data collected
from drive-test in order to provide the statistic result. With thes a s c resu , compare w e se an we can
determine the problem. Note that necessary filtering of the data
is required in order to have a valid statistics. *Etc: filter out the
problem related to measurement tools issue.
•
other reasons resulting to Call Setup Failure and/or Drop Call.
Then further analyze the problem to get the reason.
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Analysis procedure
Isolate the reason
• RF or Layer 1 related problem can be due to many reason:
Non-optimal cell design (location, antenna type/height/bearing/tilt)Wron or bad scramblin code lannin
No dominance server
Poor coverage with low RSCP or blockage issue
Pilot ollution from overshootin cell or too man overla in cell
• Call events can be triggered by many reason: Due to Layer 1 (see above)
Missing Neighbor definition
Handover parameter (delayed and/or requires offset)
Cell selection/re-selection (Can be related to Layer 1) Interference (external or internal)
Tool related (etc; UE problems)
Network problems (etc; Equipment related)
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Layer 1 optimization process
Call event optimization process
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Optimization
Improve call Quality,
Accessibility,
Improve
e a n y
Mobility
environment
coverage base on
existing network
base on increase
in subscribers
Optimization?
Parameter tuning
Recommendation
& Change
Antenna tuning
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In-building Layer 1 optimization process
Walk test data
Best active RSCP optimization problem: Poor covera e area No
No
RSCP>-
90dBm Faulty components
Power insufficient
Poor signal penetration
Best active
EcNo > -
EcNo optimization problem:
Pilot pollution
Interference
Overshooting
No Re-walk test pass KPI
Solutions
Implemented
10dB
Yes
High rise
Desire coverage optimization:
None dominance server Yes
Desire
Coverage
Coverage hole
Blockage
o
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L1 optimization
completed Yes
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Outdoor Roll-Out flow chart
Preparation of
site information
Change
ro osal
Re-Drive
testin
Implementation
of chan e
Wait for
Acceptance
Ncell review &
planningOptimization
Data post
processing
Route & Custer
definition AnalysisKPI pass?
NO
YES
Sites on air Data post
processing
r ve es ng
when 90% of
sites in cluster
on air
Single sites
verification
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Outdoor Optimization flow chart
Data post
processing
Implementati
on of change
Preparation
Route
planning
re-
optimization
drive testing
Analysis
Drive Testing
Conditional
acceptance
Final
acceptance
Ncell review
& planning
Stats
collectionOptimization
Change
proposal
Reporting
Preparation Planning Analysis & OptimizationMeasurement Acceptance
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Outdoor Layer 1 optimization process
Drive test data
Best active No
No RSCP optimization problem: Poor coverage area
RSCP>-
90dBm
oc age
Shadowing
Far Distance
Best active
EcNo > -
No Re-drive pass KPI
Solutions
Implemented
EcNo optimization problem:
Pilot pollution
Interference
Overshooting10dB
Yes Yes
Overlapping
Desire coverage optimization:
Desire
Coverage
o Coverage hole
Shadowing
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L1 optimization
completed Yes
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Layer 1 optimization process
Always provide a footprint of RSCP, EcNo, Best server, Pilot pollution plot
to have a clearer view of the problem area.
RSCP plot
Problem
area #2
From RSCP plot,
we can define poor
- ,
and provide solution after
surveying the area and
analyzing.ro em
area #1
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Call Event optimization process
Drive test process
oun
problem Attract
KPI
report on tor area
Change
Request
No NodeB faulty /
No Re-drive
Check
KPI needed
Yes
Yes
counters
Parameter tuning /
Antenna tuning Implementation
Yes Yes
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Change Proposal procedure
Change
Proposal
Verification
Drive
Yes YesNo
Customer /Operator
Update
database
YesYes
Report to
or network
engineer
of change
proposal
customer on
the failure
implementation
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Optimization Issue
In optimization, we have different scenario resulting in
Problems Likely reason Solution
Missing Neighbors Poor neighbors planning from
planner
Review/add/del neighbors
Co-Scramblin Code Incorrect database or oor Chan e SC of Co-SC cells
assigning of SC from planner
Fading (Signal degrading
rapidly)
Cornering / Shadowing / IBC
spillage
Fine tuning antenna or
parameter tuning
Pilot pollution (Bad EcNo
quality but good RSCP level)
Overshooting or spillage IBC
signal
Remove unwanted signal or
overlapping coverage
Poor coverage (RSCP level Blockage or no LOS Change higher gain antenna orbelow -105dBm) implement repeater solution
No dominance server (RSCP
good but poor EcNo)
Too many serving cells in an area /
Too many LAU in the borders
Reduce overlapping coverage
and create the most dominance
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