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Steps about GSM RF Optimization Step by Step and how to find KPI degradation and its solution.
The RF network optimization process can be categorized by the following steps:

Problem analysis

• Analyzing performance retrieved from tool reports and statistics for the worst performing BSCs and/or Sites
• Viewing ARQ reports for BSC/Site performance trends
• Examining planning tool coverage predictions
• Analyzing previous drive test data
• Discussions with local engineers to prioritize problems
• Checking customer complaints reported to local engineer

Checks prior to action
• Cluster definitions by investigating BSC borders, main cities, freeways, major roads
• Investigating customer distribution, customer habits (voice/data usage)
• Running specific traces on network to categorize problems
• Checking trouble ticket history for previous problems
• Checking any fault reports to limit possible hardware problems prior to test

Drive testing
• Discussion of drive test goals and objectives
• Defining drive test routes
• Collecting log files
• Scanning frequency spectrum for possible interference sources
• Re–driving questionable data

Areas of Investigation
• Non–working sites/sectors or TRXs
• Improper function of radio network features like frequency hopping, antenna hopping, etc.
• Limited data throughput and performance (GPRS/EGPRS)
• Overshooting sites – coverage overlaps
• Coverage holes
• C/I, C/A analysis
• High interference areas
• Dropped calls
• Capacity problems
• Other interference sources
• Inaccurate neighbor lists (including 1-way neighbor definitions)
• Handover ping-ponging
• Drops due to handovers
• Accessibility and retain ability of the network
• Equipment performance
• Faulty Installations

After the test
• Data post processing
• Plotting RX level and quality information for overall picture of the driven area
• Initial discussions on drive test with local engineers
• Reporting urgent problems for immediate action
• Analyzing network feature performance after new implementations
• Transferring comments on parameter implementations after new changes

Recommendations
• Definition of missing neighbor relations
• Propose new sites or sector additions with before and after coverage plots
• Propose antenna azimuth changes
• Propose antenna tilt changes
• Propose antenna type changes
• Investigation of BTS Equipment/Filter change
• Re–tune of interfered frequencies
• Investigation of BSIC changes
• Adjustment of power settings
• Adjustment of handover margins (Power Budget, Level, Quality, Umbrella HOs)
• Adjustment of accessibility parameters (RX Lev Acc Min, etc.)
• Attenuation of Adds/Removals
• Propose MHA/TMA adds

Other optimization issues
• Verifying performance of new sites
• Verifying handovers
• Investigating GPRS performance
• Verifying sectorizations
• Collecting DTI scan files
• Verifying coverage
• Verifying propagation model by importing DTI scan files to Planet (any Analyzer)
• Periodic consistency checks
• Frequency planning check
• Analyzing cell access parameters
• Analyzing handover parameters
• Analyzing power control parameters
• Analyzing frequency hopping parameters (HSN, MAIO)
• Implementing/analyzing optional features
• Assisting local engineers with emergency cases Benchmarking