8/10/2019 2G DT Introduction-Part 2

1/41

Drive Test Introduction

Prepared by Eng. Ahmed Montaser

Prepared by

Ahmed Montaser Sr.RNO EngineerMob: 01116368468

E-mail: Ahmed_Montaser_85@hotmail.com

8/10/2019 2G DT Introduction-Part 2

2/41

Drive Test Introduction

Prepared by Eng. Ahmed Montaser

2G Field Problems

8/10/2019 2G DT Introduction-Part 2

3/41

Drive Test Introduction

Prepared by Eng. Ahmed Montaser

1. Cross sector

2. Cross feeder

3. HO Failures.

4. Missing Neighbors.

5. Dropped calls.

6. Blocked calls.

7. Overshooting

8. Hardware problem

2G Field Problems

8/10/2019 2G DT Introduction-Part 2

4/41

Drive Test Introduction

Prepared by Eng. Ahmed Montaser

Cross sector

8/10/2019 2G DT Introduction-Part 2

5/41

Drive Test Introduction

Prepared by Eng. Ahmed Montaser

There are 3 types of Cross sector

1- GSM cross sector

2- DCS cross sector

3- Total cross sector (GSM & DCS) cross sector

8/10/2019 2G DT Introduction-Part 2

6/41

Drive Test Introduction

Prepared by Eng. Ahmed Montaser

1-Cross sector

This is the normal connection

8/10/2019 2G DT Introduction-Part 2

7/41

Drive Test Introduction

Prepared by Eng. Ahmed Montaser

GSM & DCS cross sector

GSM & DCS cross (Total cross)

8/10/2019 2G DT Introduction-Part 2

8/41

Drive Test Introduction

Prepared by Eng. Ahmed Montaser

GSM & DCS cross sector

DCS cross

8/10/2019 2G DT Introduction-Part 2

9/41

Drive Test Introduction

Prepared by Eng. Ahmed Montaser

GSM & DCS cross sector

GSM cross

8/10/2019 2G DT Introduction-Part 2

10/41

Drive Test Introduction

Prepared by Eng. Ahmed Montaser

EX: GSM cross sector

Sector 3 serve beside sec 1 and vice versa Cross sector between sec 1 & sec 3 GSM

8/10/2019 2G DT Introduction-Part 2

11/41

Drive Test Introduction

Prepared by Eng. Ahmed Montaser

After solving the cross sector

Sector 3 serve beside sec 1 and vice versa Cross sector between sec 1 & sec 3 GSM

8/10/2019 2G DT Introduction-Part 2

12/41

Drive Test Introduction

Prepared by Eng. Ahmed Montaser

Cross feeder

8/10/2019 2G DT Introduction-Part 2

13/41

Drive Test Introduction

Prepared by Eng. Ahmed Montaser

2-Cross feeder

GSM cross feeder

8/10/2019 2G DT Introduction-Part 2

14/41

8/10/2019 2G DT Introduction-Part 2

15/41

Drive Test Introduction

Prepared by Eng. Ahmed Montaser

EX: GSM cross feeder

Sector 2 & sector 3 appeared with equal levels beside sector 2 cross feeder

between sector 2 & sector 3

8/10/2019 2G DT Introduction-Part 2

16/41

Drive Test Introduction

Prepared by Eng. Ahmed Montaser

After solving the cross feeder

Sector 2 & sector 3 appeared with equal levels beside sector 2 cross feeder

between sector 2 & sector 3

8/10/2019 2G DT Introduction-Part 2

17/41

Drive Test Introduction

Prepared by Eng. Ahmed Montaser

Missing Neighbors

i d i

8/10/2019 2G DT Introduction-Part 2

18/41

Drive Test Introduction

Prepared by Eng. Ahmed Montaser

8/10/2019 2G DT Introduction-Part 2

19/41

D i T I d i

8/10/2019 2G DT Introduction-Part 2

20/41

Drive Test Introduction

Prepared by Eng. Ahmed Montaser

1. HO Failure reasons.

Interference on Target Cell.

Interference on Serving Cell.

Bad Rxlev on Target Cell.

Bad Rxlev on Serving Cell.

2G Field Problems

D i T t I t d ti

8/10/2019 2G DT Introduction-Part 2

21/41

Drive Test Introduction

Prepared by Eng. Ahmed Montaser

HO failure due to Bad quality on the target cell (Co-channel interference)

D i T t I t d ti

8/10/2019 2G DT Introduction-Part 2

22/41

Drive Test Introduction

Prepared by Eng. Ahmed Montaser

HO failure due to Bad quality on the target cell (Adjacent-channel interference)

D i T t I t d ti

8/10/2019 2G DT Introduction-Part 2

23/41

Drive Test Introduction

Prepared by Eng. Ahmed Montaser

HO failure due to Bad quality on the serving cell

D i T t I t d ti

8/10/2019 2G DT Introduction-Part 2

24/41

Drive Test Introduction

Prepared by Eng. Ahmed Montaser

HO failure due to Bad Rxlev on the serving cell

Drive Test Introduction

8/10/2019 2G DT Introduction-Part 2

25/41

Drive Test Introduction

Prepared by Eng. Ahmed Montaser

Dropped call

Drive Test Introduction

8/10/2019 2G DT Introduction-Part 2

26/41

Drive Test Introduction

Prepared by Eng. Ahmed Montaser

3. Dropped call reasons.

Delayed HO Congestion or wrong HO parameter definition.

HO Failure.

Bad Quality.

Missing neighbor (Bad Rx level).

Transmission problem (Not RF problem)

Drive Test Introduction

8/10/2019 2G DT Introduction-Part 2

27/41

Drive Test Introduction

Prepared by Eng. Ahmed Montaser

Dropped call due to delayed HO

Drive Test Introduction

8/10/2019 2G DT Introduction-Part 2

28/41

Drive Test Introduction

Prepared by Eng. Ahmed Montaser

Dropped call due HO failure & Bad quality

Drive Test Introduction

8/10/2019 2G DT Introduction-Part 2

29/41

Drive Test Introduction

Prepared by Eng. Ahmed Montaser

Dropped call due to Missing neighbor (Bad Rx level).

Drive Test Introduction

8/10/2019 2G DT Introduction-Part 2

30/41

Drive Test Introduction

Prepared by Eng. Ahmed Montaser

Dropped call due to Missing neighbor (Bad Rx level).

Drive Test Introduction

8/10/2019 2G DT Introduction-Part 2

31/41

Drive Test Introduction

Prepared by Eng. Ahmed Montaser

Dropped call due to Transmission problem (Not RF problem)

Drive Test Introduction

8/10/2019 2G DT Introduction-Part 2

32/41

Drive Test Introduction

Prepared by Eng. Ahmed Montaser

Blocked call

Drive Test Introduction

8/10/2019 2G DT Introduction-Part 2

33/41

Drive Test Introduction

Prepared by Eng. Ahmed Montaser

4. Blocked call reasons.

No available TCH

No available SDCCH

Bad Rxlev.

Bad Quality

8/10/2019 2G DT Introduction-Part 2

34/41

Drive Test Introduction

8/10/2019 2G DT Introduction-Part 2

35/41

Drive Test Introduction

Prepared by Eng. Ahmed Montaser

Blocked call due to No Immediate Assignment (No SDCCH)

Drive Test Introduction

8/10/2019 2G DT Introduction-Part 2

36/41

Drive Test Introduction

Prepared by Eng. Ahmed Montaser

Blocked call due to Bad Rxlev & Bad Qual

Drive Test Introduction

8/10/2019 2G DT Introduction-Part 2

37/41

Drive Test Introduction

Prepared by Eng. Ahmed Montaser

Overshooting

Drive Test Introduction

8/10/2019 2G DT Introduction-Part 2

38/41

Drive Test Introduction

Prepared by Eng. Ahmed Montaser

Overshooting cell

Drive Test Introduction

8/10/2019 2G DT Introduction-Part 2

39/41

Drive Test Introduction

Prepared by Eng. Ahmed Montaser

Hardware problem

Drive Test Introduction

8/10/2019 2G DT Introduction-Part 2

40/41

Drive Test Introduction

Prepared by Eng. Ahmed Montaser

Hardware problem

Drive Test Introduction

8/10/2019 2G DT Introduction-Part 2

41/41

Drive Test Introduction

Thank you

Best Regards,

Ahmed Montaser