Presentation Confidential between MTN ad Audience

Garki and Environs (Garki Modern Market, Garki Village and Other Parts of Garki) July 2013PRE-OPTIMIZATION AND

POST-OPTIMIZATION COMPLAINT

DRIVE TEST REPORT

MTN GSM NPM PROJECT

Introduction

• The data collection was conducted on 18th July,2013 for the pre-optimization and 19th July,2013 for the post-optimization respectively

• The test was an optimization check

• The drive test covers Garki and Environs (Garki Modern Market, Garki Village and Other Parts of Garki),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 inability or difficulty in making or initiating calls .

Serving Cells of the Complaint Area(Before Optimization)

Serving Cells of the Complaint Area(After Optimization)

Call Statistical Data

Call Statistical Data

AT GARKI INTERNATIONAL MARKET

AT GARKI VILLAGE AND OTHER PARTS OF GARKI

Pre-Optimization

Post-Optimization

Pre-Optimization

Post-Optimization

Call Attempts 111 9 233 13Call Setup Success 2 9 2 13

Blocked Calls 109 0 230 0Dropped Calls 0 0 0 0

Total Good Calls - /Call End 1 9 0 13Established Calls 2 9 2 13

Total Handover Success 21 21 16 94Total Handover Failures 3 1 0 1

Total Location Update Requests - - - -Total Location Success - - - -

Total Location Update Failures - - - -% Call Setup Success 1.80% 100.00% 0.86% 100.00%

% Blocked Calls 98.20% 0.00% 98.71% 0.00%% Dropped Calls 0.00% 0.00% 0.00% 0.00%

% Established Calls 1.80% 100.00% 0.86% 100.00%% Good Calls 50.00% 100.00% 0.00% 100.00%

% Handover Success 87.50% 95.45% 100.00% 98.95%% Handover Failure 12.50% 4.55% 0.00% 1.05%

% Location Update Success - - - -% Location Update Failures - - - -

Coverage, Quality & Interference

Signal Level Downlink RxSignal Level

Performance Indicator GARKI AND ENVIRONS % Probability Density Functon

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

[120, -102) 0.01% 0.00%

[-102, -95) 0.06% 0.01%

[-95, -90) 0.38% 0.29%

[-90, -85) 1.16% 2.19%

[-85, -75) 9.27% 16.76%

[-75, -65) 23.90% 34.23%

[- 65, 0) 65.23% 46.53%

   

GSM Voice Coverage Reliability

 

% Coverage Reliability % RxSignal Level > (-95dbm) 99.94% 99.99%

   

Coverage, Quality & Interference

Downlink Rx Quality Level_Sub Performance Indicator GARKI AND ENVIRONS

% Probability Density Functon (PDF) MTN_JulyRanges Pre-Optimization Post-Optimization

[0, 4) 72.31% 84.30%

[4, 5) 3.40% 5.77%

[5, 6) 11.51% 3.97%

[6, 7) 12.78% 5.95%

     

     

     

     

RxQual > 5 24.29% 9.92%

Overall Received Signal Quality Value : RxQual < 5

75.71% 90.08%

    Downlink Rx Quality Level 

Performance Indicator

KPI Statistics & Network Performance

KPI RAW GARKI AND ENVIRONSPre-Optimization Post-Optimization

Accessibility 1.16% 100.00%Retainability 92.50% 98.29%

Voice Quality (RxQual < 5) 75.71% 90.08%Handover Success 92.50% 98.29%

Coverage Reliabilty (RxLev > -95dBm) 99.94% 99.99%

KPI Score MTN_July MTN_JulyAccessibility -14.71 10.00Retainability 8.13 9.57

Voice Quality (RxQual < 5) 3.93 6.70Handover Success 8.13 9.57

Coverage Reliabilty (RxLev > -95dBm) 9.98 10.00

Total Score -1.64 6.25

Network Quality Score 2.49 2.98

% SQI 90.49% 90.38%

RxLevSubPre-Optimization Post-Optimization

RxLevSubPre-Optimization Post-Optimization

Rxqual SubPre-Optimization Post-Optimization

Rxqual SubPre-Optimization

Post-Optimization

SQIPre-Optimization Post-Optimization

SQIPre-Optimization

Post-Optimization

SUMMARY – Blocked Call and Interference

Blocked Call

HOF

S/N CELLOCCURRENCE REASON COMMENT

1 FC0071E,D 109Co-BCCH/BSIC Conflict

and High Congestion

BSIC change and congestion

reduction needed

S/N CELLOCCURRENCE REASON COMMENT

1 FC0071E,D 2

Co-BCCH/BSIC Conflict

BSIC change needed

2 FC2174A 1

Missing neighbours and High Congestion Congestion reduction needed

Pre-Optimization Post-Optimization

No blocked call after Optimization and the traffic was balanced and reduced.

S/N CELLOCCURRENCE REASON COMMENT

11247C,1807

DB 2Poor coverage

and quality frequency retune needed

2 FC0087D 1Poor coverage

and qualityfrequency retune needed

3 1247DB 2

Poor coverage and quality frequency retune needed

S/N CELLOCCURRENCE REASON COMMENT

1 FC0087A 2Missing

neighboursConfigure 1247DB as neighbour to FC0087A

HOF

Interference S/N CELL

OCCURREN

CE REASON COMMENT

1 1247A 2Poor quality and

interferenceChange TCH Freq. from

99 to 90

2 FC0087A 1Poor quality and

interferenceChange TCH Freq. from

99 to 88

3 1807C 1

Poor quality and interference

Change TCH Freq. from 99 to 96

4 1807A 1

Poor quality and interference

Change TCH Freq. from 79 to 95

Interference

SUMMARY–Co-BCCH/BSIC Conflict & Alarm

Co-BCCH/BSIC Conflict S/N CELL

OCCURRENCE REASON COMMENT

1 FC2174D 1

The same BCBSIC change needed

CH (680) and BSIC(01) as FC0071E BSIC change

needed

2 FC0071E 1The same BCCH (680) and

BSIC(01) as FC2174DBSIC change

needed

3 FC2174E 1

The same BCCH (682) and BSIC(01) as FC0071D

BSIC change needed

4 FC0071D 1

The same BCCH (682) and BSIC(01) as FC2174E

BSIC change needed

5FC0071F,F

C2174F 1

The same BCCH (684) and BSIC(01)

BSIC change needed

Pre-Optimization Post-Optimization

S/N CELLOCCURRENCE REASON COMMENT

1 FC0087 1High

TemrperatureNeeded to be resolved to

improve CSSR

Alarm

S/N CELL

OCCURREN

CE REASON COMMENT

1 FC2174D 1

To improve CSSR, Coverage and

qualityChange BSIC to 37

2FC0071

E 1

To improve CSSR,Coverage

and quality Retain BSIC as 01

3FC2174

E 1

To improve CSSR,Coverage

and qualityChange BSIC to 37

4FC0071

D 1

To improve CSSR, Coverage and

qualityRetain BSIC as 01

5 FC2174F 1

To improve CSSR, Coverage and

quality Change BSIC to 37

S/N CELL

OCCURREN

CE REASON COMMENT

1 FC0087 1High

TemperatureNot yet resoled as at

23.07.13

Alarm

Blocked Call

PROBLEM: Blocked calls occurred on FC0071E that appeared to be serving in the current channel (FC2174D)

OBSERVATION: The cell FC0071E is serving the complaint area at a distance 9.21km with good rxlev and rxqual whereas it is FC2174D that is suppose to be serving being the current channel and best server. The BCCH (680) and BSIC(01) of FC0071E and FC2174D are the same, that is Co-BCCH/BSIC conflictRECOMMENDATION: Change the BSIC of FC2174D from 01 to 37 ( Implemented)

Network Issue: Case1Pre-Optimization Post-Optimization

OBSERVATION: The BSIC of FC2174D is now 37. Handover failure occurred from FC0087A to 1247DB. There is high temperature alarm on FC0087

RECOMMENDATION: Configure 1247DB as neighbour to FC0087A (Implemented).The alarm on FC0087 should be cleared as soon as possible

Blocked Call

PROBLEM: Blocked calls occurred on FC0071D that appeared to be serving in the current channel (FC2174E)

OBSERVATION: The cell FC0071D is serving the complaint area at a distance 9.21km with good rxlev and rxqual whereas it is FC2174E that is suppose to be serving being the current channel and best server. The BCCH (682) and BSIC(01) of FC0071D and FC2174E are the same, that is Co-BCCH/BSIC conflictRECOMMENDATION: Change the BSIC of FC2174E from 01 to 37 ( Implemented)

Network Issue: Case2Pre-Optimization Post-Optimization

OBSERVATION: The BSIC of FC2174E is now 37 .There is still Co-BCCH and BSIC conflict on FC0071F and FC2174FRECOMMENDATION: Change the BSIC of FC2174F from 01 to 37 (Implemented)

Handover Failure

Network Issue: Case1

PROBLEM: Handover failures occurred FC0071E to neighbouring cells in the current channel of FC2174D

OBSERVATION: The cell FC2174D has a few neighbour list and there is a very high congestion on the cell even before the arrival of

the subscribers at the market or complaint area RECOMMENDATION: Configure more neighbours to FC2174D and reduce the congestion by addition of more TRXs on the cell. Also change the parameter “DLEDGETHRES” to balance traffic. (All Implemented)

Pre-Optimization Post-Optimization

OBSERVATION: The handover failures reduced and FC2174D is now the best server with reduced congestion. However, one handover failure from FC0087A to 1247DB.

RECOMMENDATION: Configure 1247DB as a neighbour to FC0087A (Implemented)

Poor Quality and InterferenceNetwork Issue: Case1

PROBLEM: Poor quality due to interference

OBSERVATION: Poor quality due to interference by 1807A ,1247DB,FC0087D and 1247B.

RECOMMENDATION: Check the recommendation page for the frequency retune

CONCLUSION

There is a serious network problem at Garki and Environs of difficulty or inability to make or initiate calls as result of consistent and prolong blocked calls at the complaint areas due to Co-BCCH/BSIC Conflict, High congestion and alarm on cells.

Pre-Optimization Post-Optimization

The subscribers at Garki and Environs can now make and receive calls after all the recommendation have been implemented as the network coverage and quality are now good and okay at the complaint area.

RECOMMENDATIONSTo resolve the network problem and improve the network performance

at Garki and Environs, the following recommendations should be done:

(1) Change the BSIC of FC2174D from 01 to 37

(2) Change the BSIC of FC2174E from 01 to 37

(3) Configure more neighbours to FC2174D

(4) Reduce the congestion on the FC2174D by addition of more TRXs on the cell and reduce also change the parameter “DLEDGETHRES” to balance traffic on all the cells of FC2174.

(5) Configure 1247DB as neighbour to FC0087A.

(6) The alarm on FC0087 should be cleared as soon as possible

(7) Change the BSIC of FC2174F from 01 to 37

(8) Implement change in frequency for the following interfering cells to improve the poor quality at the complaint area and prevent interference:

(a)Change the TCH Frequency of 1247A from 99 to 90

(b) Change the TCH Frequency of FC0087A from 99 to 88

(c) Change the TCH Frequency of 1807C from 99 to 96

(d) Change the TCH Frequency of 1807A from 79 to95

THANK YOU