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7/29/2019 21688231 Proposal for GSM Network Optimization Audit Tsel
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PT.Telkomsel
Proposal for GSM Network Optimization
September 2009
HS
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Overview
Optimization is all actions intended to tune all aspects of the GSM networkperformance, covering access network, core network, and transmissionnetwork.
Access network optimization procedure consists of two phases: cluster testingand system integration optimization. In other words, the initial pass of the RFoptimization will be performed as a part of cluster tests: the second, moredetailed, tuning phase will occur after completion of all cluster tests, whichoccur after activation of all cell sites in the GSM network.
The primary reason for breaking the optimization work into two phases is toreduce the time and resources required to complete the cluster test cycles.
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Objective
To ensure the achievement of acceptable coverage
To maximize the quality of service
To maximize the network efficiency (including load balancing)
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Consideration
System stability and performance : To easy and simplify optimization
process, instability and bad performance of system should be clarified.
Coverage : Can be adjusted by power settings (total, overhead),
antenna tilting and orientation, hand-off area and so on.
Capacity : Trunk lines, Number of traffic channel and elements should
be equipped with sufficient quantity
Parameters : Can be adjusted for the better coverage and capacity
adjustment
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Project Organization
PT.Telkomsel
PM & Local Engineer
Optimization Audit Support Management
PM Network Optimizations
Vendor
PM & Local Engineer
Co-work
AGTINDO
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START(Preparation)
Survey & Simulation Network Evaluation
Optimization
Target & Method Decision
Optimization
Execution
Optimization Evaluation
Performance
Objectives ?
END
YES
NO
Preparation: BTS info. & Parameter Review
o BTS position, type, output power, antenna info.
o Frequency Status
o Neighbor list
Site Survey & Simulation
o Drive test & walk test
o Rx Quality, Rx Level, Coverage plot
o Handoff performance
Network Evaluation: Field measurement & analysis
o Field measurement with Tems Investigations
o Call event analysis
- fail and dropped call
- signal distribution (Rxqual, RxLev, SQI, etc)
Reduce bad quality area & Find Optimization method
o Weak signal and Freq Interference
o Parameter error / Missing Neighbor, etc
o Hardware trouble, etc
Execution, Evaluation and feedback
Optimization Process (1)
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Field measurement & analysis
- Coverage (bad area) analysis- Coverage overlay ratio
- Call quality(drop and fail rate)
NMS data analysis
- System type / performance
- System statistics analysis
(C/D rate, Call fail, etc)
Optimization Target
- Coverage
- Call quality
Decision forOptimization method
Coverage Improvement
(Shadow & Bad area)
Traffic Balancing
(site / sector based)
System performance
improvement
Accomplishment & Evaluation
- Issue based optimization
- Evaluation for target goal
Optimization result
Feedback for engineering
System facilities check
System type change
Parameter error correction
Recommendation
Trouble shooting
Optimization Process (2)
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Setup
Field measurement
CQT analysis
CQT report
Action plan for opt.
CQT Report & Opt. Action Plan Report & Presentation
Project setup
Kick off meeting MS registration
Data analysis
- BTS info.
- Parameter
- etc.
1st CQT 2nd CQT
Access Network Optimization
BTS Opt.
- Site survey
- Fisical Tunning
- Simulation
- Cluster opt.
- etc.
Parameter Opt.
- System parameter
- Access parameter
- Handoff
- Neighbor list adjust
- etc 2nd CQT Report & Presentation
Work Plan
1st week 2nd ~ 3rd week 4th week ~ 11th week 12th week
Note 1) CQT: Call Quality Test
2) Opt.: Optimization
)Basic Data Analysis & CQT )Optimization (System, Parameter, etc) CQT & Report
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Detail Items of Optimization
BTS Basic Test(1): Basic Parameter Review
Basic items to be checked
o BTS information and Hardware characteristics- Site Name and Type
- Antenna type, height, directions and tilting degree, ( VSWR )
o Target service area of the base station and design capacity
Parameter settings to be checked
o Neighbor list of each sector
o Handoff parameter
o Access parameter
o Traffic channel parameter (Capacity)
o Frequency / Channel Number
o Power control parameter, etc
Basic call test
o Mobile to mobile, mobile to fix lines, fix lines to mobile call test: origination & termination
o Handoff test: in idle and dedicated mode
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Detail Items of Optimization
BTS Basic Test(2): Considerations
Database & fisical cheking
o Operator input error, Database Parameter loading error for BTS.
o Cable connection error between BTS and antenna (VSWR).
RF environment /Condition check
o Using real call ( drive test & walk test with measurement test ).
- This is used in most cell optimizations and field trials. Check for Interference, Speech quality, Signal
level and Handover (and data com transfer / GPRS check).
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o Set the service area
o Find the coverage shadowing area / Indicate the shadowing area on the map
o Run field drive test / walk test
o Set the BTS transmit power and system parameters
o Optimize coverage
o Define the handoff area and optimize the handoff region: BTS power and antenna direction
o BSC parameter and ensure forward and reverse link balanceo Optimize FER/AMR
Considerations
Center Cell Neighbor Cell
Cluster
Detail Items of Optimization
Cluster Test
Goal
o To verify the required basic function, performance and network stabilitythrough field test (classify the cluster)
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Detail Items of Optimization
Network Integration(1)
Optimization Target Area
o Weak signal areaso Call drop areas
o Access failure areas (call fail)
1) Weak Signal Area
Problem
o Check Transmit power
o Change antenna tilt
o Antenna replacement
Solution
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Detail Items of Optimization
Network Integration(2)
Optimization Target Area
o Weak signal areas
o Call drop areas
o Access failure areas (call fail)
2) Call droop areas
Problem
o Check the frequency
- Adjust interferences
- changes frequency or ant fisical tunning
o Check the neighbor list
- Missing neighbor list and- erroneous neighbor list order
Solution
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Detail Items of Optimization
Network Integration(3)
Optimization Target Area
o Weak signal areaso Call drop areas
o Access failure areas (call fail)
3) Access failure areas (call fail)
Problem
o Check the access parameter
- capacity, frequency, signal power
o Excessive IDLE handoff: coverage adjust
o MSC, zone border: check registration
Solution
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Detail Items of Optimization
Network Integration(4)
Hardware and Parameter Trouble shooting
o Hardware troubleo Handoff and access parameter
1) Hardware trouble
Problem Solution
Type Phenomenon Optimization scheme
Antenna VSWRCoverage reduction
High Tx_adj (above + 10dB)Antenna replacement
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Detail Items of Optimization
Network Integration(5)
Hardware and Parameter Trouble shooting
o Hardware trouble
o Handoff and access parameter trouble
1) Handoff parameter trouble
Problem Solution
Type Phenomenon Optimization scheme
Poor IDLE handoff Temporary NO SERVICE during H/O Neighbor list check
Poor H/O Call drop, etc Neighbor list and signal check
2) Access parameter trouble
- Traffic channel parameters
- Multi-path delay compensation
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