Introduction & Complete TUTORIAL 3G Rf-Optimization AND Log-File Analysis

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Rf-Optimization AND Log-File Analysis

INTRODUCTION

Every alive Network needs to be under continues control to maintain/improve the

performance. Optimization is basically the only way to keep track of the network by

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looking deep into statistics and collecting/analyzing drive test data. It is keeping an eye

on its growth and modifying it for the future capacity enhancements. It also helps

operation and maintenance for troubleshooting purposes.

Successful Optimization requires:

• Recognition and understanding of common reasons for call failure

• Capture of RF and digital parameters of the call prior to drop

• Analysis of call flow, checking messages on both forward and reverse

links to establish “what happened”, where, and why.

Optimization will be more effective and successful if you are aware of what you are

doing. The point is that you should now where to start, what to do and how to do.

Purpose and Scope of Optimization

The optimization is to intend providing the best network quality using available

spectrum as efficiently as possible. The scope will consist all below;

• Finding and correcting any existing problems after site implementation and

integration.

• Meeting the network quality criteria agreed in the contract.

• Optimization will be continuous and iterative process of improving overall

network quality.

• Optimization can not reduce the performance of the rest of the network.

• Area of interest is divided in smaller areas called clusters to make optimization

and follow up processes easier to handle.

Optimization Process

Optimization process can be explained by below step by step description:

Problem Analysis

·       Analyzing performance retrieve 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 engineers

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

·       Preparing Action Plan

·       Defining drive test routes

·       Collecting RSSI Log files

·       Scanning frequency spectrum for possible interference sources

·       Re–driving questionable data
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Subjects to Investigate

·       Non–working sites/sectors or TRXs

·       In–active Radio network features like frequency hopping

·       Disabled GPRS

·       Overshooting sites – coverage overlaps

·       Coverage holes

·       C/I, C/A analysis

·       High Interference Spots

·       Drop Calls

·       Capacity Problems

·       Other Interference Sources

·       Missing Neighbors

·       One–way neighbors

·       Ping–Pong Handovers

·       Not happening handovers

·       Accessibility and Retainability of the Network

·       Equipment Performance

·       Faulty Installations

After the Test

·       Post processing of data

·       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

·       Defining missing neighbor relations

·       Proposing new sites or sector additions with Before & After coverage plots

·       Proposing antenna azimuth changes

·       Proposing antenna tilt changes

·       Proposing antenna type changes

·       BTS Equipment/Filter change

·       Re–tuning of interfered frequencies

·       BSIC changes

·       Adjusting Handover margins (Power Budget, Level, Quality, Umbrella

·       HOs)

·       Adjusting accessibility parameters (RX Lev Acc Min, etc..)

·       Changing power parameters

·       Attenuation Adds/Removals

·       MHA/TMA adds

Tracking

·       Re–driving areas after implementing recommendations

·       Create a tracking file to follow–up implementation of recommendations

Other Optimization Tips

·       Verifying performance of new sites

·       Verifying handovers

·       Verifying data after Re–Homes

·       Investigating GPRS performance

·       Verifying Sectorizations

·       Collecting DTI Scan files

·       Verifying coverage

·       Verifying propagation model by importing DTI scan files to Planet

·       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

·       Keep helping local engineers with emergency cases

·       Benchmarking

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