Presentation Confidential between MTN ad Audience

New Banex- Kado Bridge July 2013 POST-OPTIMIZATION DRIVE TEST REPORT

MTN GSM NPM PROJECT

Introduction

• The data collection was conducted on 14th July,2013 for the post-optimization

• The test was an optimization check

• The drive test covers New Banex-Kado Bridge, FCT, Abuja

• Drive test procedure involves two mobile stations; MS1 initiating short calls and MS2 initiating long calls.

Complaint Area and Test Route

COMPLAINT: Subscribers complained of network problems

Serving Cells of the Complaint Area

Call Statistical Data

Call Statistical DataMTN_July

Pre-Optimization Post-OptimizationCall Attempts 6 3

Call Setup Success 5 3Blocked Calls 1 0

Dropped Calls 1 0Total Good Calls - /Call End 4 3

Established Calls 5 3Total Handover Success 23 27Total Handover Failures 3 0

Total Location Update Requests 2 1Total Location Success 2 1

Total Location Update Failures 0 0% Call Setup Success 83.33% 100.00%

% Blocked Calls 16.67% 0.00%% Dropped Calls 20.00% 0.00%

% Established Calls 83.33% 100.00%% Good Calls 80.00% 100.00%

% Handover Success 88.46% 100.00%% Handover Failure 11.54% 0.00%

% Location Update Success 100.00% 100.00%% Location Update Failures 0.00% 0.00%

Coverage, Quality & Interference

Signal Level Downlink RxSignal Level

Performance Indicator   % Probability Density Functon

(PDF) MTN_JulyRanges/ dbm Pre-Optimization Post-Optimization

[120, -102) 0.01% 0.00%

[-102, -95) 0.13% 0.00%

[-95, -90) 1.24% 2.27%

[-90, -85) 6.15% 8.09%

[-85, -75) 32.77% 42.71%

[-75, -65) 34.09% 28.80%

[- 65, 0) 25.59% 18.13%

   

GSM Voice Coverage Reliability

 

% Coverage Reliability % RxSignal Level > (-95dbm) 99.85% 100.00%

   

Coverage, Quality & Interference

Downlink Rx Quality Level_Sub Performance Indicator    

% Probability Density Functon (PDF) MTN_JulyRanges Pre-Optimization Post-Optimization[0, 4) 70.25% 72.75%

[4, 5) 5.62% 4.25%

[5, 6) 7.61% 8.02%

[6, 7) 16.52% 14.98%

     

     

     

     RxQual > 5 24.13% 23.00%

Overall Received Signal Quality

Value : RxQual < 575.87% 77.00%

     Downlink Rx Quality Level 

Performance Indicator

KPI Statistics & Network Performance

KPI RAWMTN_July

Pre-Optimization Post-OptimizationAccessibility 83.33% 100.00%Retainability 88.46% 100.00%

Voice Quality (RxQual < 5) 75.87% 77.00%Handover Success 88.46% 100.00%

Coverage Reliabilty (RxLev > -95dBm) 99.85% 100.00%

KPI Score MTN_July MTN_JulyAccessibility 5.83 10.00Retainability 7.12 10.00

Voice Quality (RxQual < 5) 3.97 4.25Handover Success 7.12 10.00

Coverage Reliabilty (RxLev > -95dBm) 9.96 10.00

Total Score 4.18 6.41

Network Quality Score 2.45 2.64

% SQI 84.71% 79.46%

RxLevSub

Coverage is good and okay along New Banex-Kado bridge but poor at some areas along the bridge as seen here

Pre-Optimization Post-Optimization

Coverage is now generally better and okay along New Banex-Kado bridge

RxLevSubPre-Optimization Post-Optimization

Rxqual SubPre-Optimization Post-Optimization

The Rx quality is very bad at some areas as seen above along the bridge

The Rx quality is now generally better along the bridge

Rxqual SubPre-Optimization

Post-Optimization

SQIPre-Optimization Post-Optimization

SQIPre-Optimization

Post-Optimization

SUMMARY – Call Drop and HOF

Call Drop

HOF

S/N CELLOCCURR

ENCE REASON COMMENT

1 119A 1Poor quality and

dragged handover

The poor quality of speech caused 119A to interfere

thereby causing call drop.1222C is overshooting

2 1222B 1Overshooting and

poor quality 1222B needs to be down tilted

S/N CELLOCCURR

ENCE REASON COMMENT

1 5848DA 2

Correct neighboured configured but has KPI

parameter effeectsParameter change is neded

for optimization

2 5848A 1

Correct neighboured configured but has KPI

parameter effeects

Parameter change is neded for optimization

.

Pre-Optimization Post-Optimization

No dropped call after optimization.

No handover failure after optimization.

SUMMARY – Blocked Call and Interference

Blocked Call

Interference S/N CELL

OCCURRENCE REASON COMMENT

1 5858B 1Poor quality and

coverage Frequency retune needed

2 1222C 1Bad quality and handover failure Frequency retune needed

3 FC0131A 1 Poor quality Frequency retune needed

4 FC2073C 1Poor quality and

coverage Frequency retune needed

5 1502A 1

Poor quality and coverage

Frequency retune needed

S/N CELLOCCURR

ENCE REASON COMMENT

1 119DA 1Interfering cells

and overshootingThis cell needs to be down tilted

and some parameter change.

Pre-Optimization Post-Optimization

No blocked call after optimization.

Dropped CallNetwork Issue: Case 1

PROBLEM: Dropped call occurred on the cell 119A. OBSERVATION: The dragged HO by 1222B caused poor speech quality and the cell 1222C is overshooting. The cell 119A interfered into the area and caused call drop due to the poor qualityRECOMMENDATION: Down tilt the antenna 1222C electrically by two degrees. Change the parameter “Edge HO DL RX_LEV Threshold” value from 20 to 15. Mechanical down tilt of 119A by two degrees.

Pre-Optimization Post-Optimization

No dropped call after optimization.

Network Issue: Case 1Pre-Optimization Post-Optimization

Handover Failure

PROBLEM: Intra-cell Handover failure on 5848DA

OBSERVATION: All the configured neighbours are okay and correct. See the handover parameter below in the recommendation have issues.RECOMMENDATION: Change the inter-layer HO threshold of 5848A from 28 to 10,inter-layer HO Hysteresis from 5 to 4 to improve the HO and poor speech quality

No handover failure after optimization.

Network Issue: Case 1Pre-Optimization Post-Optimization

PROBLEM: Blocked call occurred on 119DAOBSERVATION: Thehas an average CSSR of 94.9%,Pcfail of 3.8%,HOSR of 95.04%.Max TA of 8.Rx lev access min of 10.Random access error threshold of 255. Congestion of 0.006%.No alarmRECOMMENDATION: Reduce MaxTA from 8 to 5 and down tilted the antenna of the cell by two degrees mechanically.

Blocked Call

No blocked call after optimization.

Network Issue: Case 1Pre-Optimization Post-Optimization

PROBLEM: Poor speech quality OBSERVATION: The poor quality of speech occurred due to the delayed handover and the overshooting status of 1222C RECOMMENDATION: See the recommendations for the case 1 of the network issue analysis for Dropped Call.

Other Network Issues

Quality is now better at the specified area after optimization.

Network Issue: Case 2Pre-Optimization Post-Optimization

PROBLEM: Poor speech quality OBSERVATION: The cell FC0131D is overshooting. MaxTA is 8 which is still okay considering geographical location of the site. RECOMMENDATION: Down tilt the mechanical tilt of the cell FC0131D by two degrees to improve the speech quality at this area and enhance handover

Other Network Issues

Quality is now better at the specified area after optimization.

CONCLUSION

The network performance is now generally better and okay along the New Banex-Kado Bridge in terms of coverage and quality

THANK YOU