8/10/2019 3G DT Introduction
1/42
Drive Test Introduction
Prepared by Eng. Ahmed Montaser
Prepared by
Ahmed Montaser Sr.RNO EngineerMob: 01116368468
E-mail: [email protected]
8/10/2019 3G DT Introduction
2/42
Drive Test Introduction
Prepared by Eng. Ahmed Montaser
3G Field Problems
8/10/2019 3G DT Introduction
3/42
Drive Test Introduction
Prepared by Eng. Ahmed Montaser
1. Cross sector.
2. Cross feeder.
3. Pilot pollution.
4. Missing Neighbors.
5. Overshooting
6. Delayed Soft HO
7. HO From UTRAN Failures.
8. Dropped calls.
9. Blocked calls.
10.Hardware problem
3G Field Problems
8/10/2019 3G DT Introduction
4/42
Drive Test Introduction
Prepared by Eng. Ahmed Montaser
Cross sector
8/10/2019 3G DT Introduction
5/42
Drive Test Introduction
Prepared by Eng. Ahmed Montaser
This is the normal connection
8/10/2019 3G DT Introduction
6/42
Drive Test Introduction
Prepared by Eng. Ahmed Montaser
UMTS cross sector
UMTS cross
8/10/2019 3G DT Introduction
7/42
Drive Test Introduction
Prepared by Eng. Ahmed Montaser
EX: UMTS cross sector
Sector 3 serve beside sec 2 and vice versa Cross sector between sec 2 & sec 3
8/10/2019 3G DT Introduction
8/42
Drive Test Introduction
Prepared by Eng. Ahmed Montaser
After solving the cross sector
Sectors 3 serve beside itself and its the dominant server and sector 2 serve beside itself too
8/10/2019 3G DT Introduction
9/42
Drive Test Introduction
Prepared by Eng. Ahmed Montaser
Cross feeder
8/10/2019 3G DT Introduction
10/42
Drive Test Introduction
Prepared by Eng. Ahmed Montaser
UMTS cross feeder Case #1
8/10/2019 3G DT Introduction
11/42
Drive Test Introduction
Prepared by Eng. Ahmed Montaser
2-Cross feeder (Case # 1)
Sector 1 & sector 3 appeared with equal levels beside sector 3 and vice versa
cross feeder between sector 1 & sector 3
8/10/2019 3G DT Introduction
12/42
Drive Test Introduction
Prepared by Eng. Ahmed Montaser
After solving the cross Feeder
Sectors 3 serve beside itself and sector 1 serve beside itself too
8/10/2019 3G DT Introduction
13/42
Drive Test Introduction
Prepared by Eng. Ahmed Montaser
UMTS cross feeder Case # 2
8/10/2019 3G DT Introduction
14/42
Drive Test Introduction
Prepared by Eng. Ahmed Montaser
2-Cross feeder (Case # 2)
Sector 2 serve normally beside itself but the Tx power (UL power is very largecompared with UE distance, the same case for sector 3
8/10/2019 3G DT Introduction
15/42
Drive Test Introduction
Prepared by Eng. Ahmed Montaser
After solving the cross Feeder
8/10/2019 3G DT Introduction
16/42
Drive Test Introduction
Prepared by Eng. Ahmed Montaser
Pilot Pollution
8/10/2019 3G DT Introduction
17/42
Drive Test Introduction
Prepared by Eng. Ahmed Montaser
Pilot pollution:
The presence of more than a pilot with level difference within 5 dBm causing low
Ec/No all of them are strong but no one is strong enough to be dominant regardingthat they are of the same frequency
i d i
8/10/2019 3G DT Introduction
18/42
Drive Test Introduction
Prepared by Eng. Ahmed Montaser
i I d i
8/10/2019 3G DT Introduction
19/42
Drive Test Introduction
Prepared by Eng. Ahmed Montaser
Missing Neighbors
D i T I d i
8/10/2019 3G DT Introduction
20/42
Drive Test Introduction
Prepared by Eng. Ahmed Montaser
Missing Neighbor:
The presence of a detected neighbor with high RSCP for a period without adding to the
AS list causing degradation in Ec/No
D i T t I t d ti
8/10/2019 3G DT Introduction
21/42
Drive Test Introduction
Prepared by Eng. Ahmed Montaser
Overshooting
D i T t I t d ti
8/10/2019 3G DT Introduction
22/42
Drive Test Introduction
Prepared by Eng. Ahmed Montaser
D i T t I t d ti
8/10/2019 3G DT Introduction
23/42
Drive Test Introduction
Prepared by Eng. Ahmed Montaser
Delayed soft HO
D i T t I t d ti
8/10/2019 3G DT Introduction
24/42
Drive Test Introduction
Prepared by Eng. Ahmed Montaser
There is delayed soft HO due to Radio link congestion on cell with SC:218 or it may
be wrong SHO parameter (AS update parameters).
Drive Test Introduction
8/10/2019 3G DT Introduction
25/42
Drive Test Introduction
Prepared by Eng. Ahmed Montaser
Drive Test Introduction
8/10/2019 3G DT Introduction
26/42
Drive Test Introduction
Prepared by Eng. Ahmed Montaser
HO from UTRAN failure
Drive Test Introduction
8/10/2019 3G DT Introduction
27/42
Drive Test Introduction
Prepared by Eng. Ahmed Montaser
1. HO Failure reasons.
Interference on Target 2G Cell.
Bad Rxlev on Target 2G Cell.
Interference on Serving 3G Cell.
Bad Rxlev on Serving 3G Cell.
2G Field Problems
Drive Test Introduction
8/10/2019 3G DT Introduction
28/42
Drive Test Introduction
Prepared by Eng. Ahmed Montaser
Delayed Soft HO which leads to make HO from UTRAN but HO from UTRAN failed.
Drive Test Introduction
8/10/2019 3G DT Introduction
29/42
Drive Test Introduction
Prepared by Eng. Ahmed Montaser
Dropped call
Drive Test Introduction
8/10/2019 3G DT Introduction
30/42
Drive Test Introduction
Prepared by Eng. Ahmed Montaser
3. Dropped call reasons.
Bad Radio condition (Bad RSCP or EcNo or both of them) due to the following:
1) Pilot pollution .
2) Delayed SHO Congestion or wrong SHO parameter definition.
3) HO from UTRAN Failure.
4) Missing neighbor (Bad Rx level).
5) Over shooting.
6) Poor coverage.
Note: all mentioned reasons make a dropped call in case of no HO from UTRAN occurredsuccessfully.
Transmission problem (Not RF problem)
Drive Test Introduction
8/10/2019 3G DT Introduction
31/42
Drive Test Introduction
Prepared by Eng. Ahmed Montaser
Dropped call due to pilot pollution & no HO from UTRAN occurred.
Drive Test Introduction
8/10/2019 3G DT Introduction
32/42
Drive Test Introduction
Prepared by Eng. Ahmed Montaser
Dropped call due to delayed SHO& no HO from UTRAN occurred.
8/10/2019 3G DT Introduction
33/42
Drive Test Introduction
8/10/2019 3G DT Introduction
34/42
Drive Test Introduction
Prepared by Eng. Ahmed Montaser
Dropped call due to Missing neighbor & no HO from UTRAN occurred..
Drive Test Introduction
8/10/2019 3G DT Introduction
35/42
Drive Test Introduction
Prepared by Eng. Ahmed Montaser
Dropped call due to overshooting& no HO from UTRAN occurred.
Drive Test Introduction
8/10/2019 3G DT Introduction
36/42
Drive Test Introduction
Prepared by Eng. Ahmed Montaser
Dropped call due to Transmission problem (Not RF problem)
Drive Test Introduction
8/10/2019 3G DT Introduction
37/42
Drive Test Introduction
Prepared by Eng. Ahmed Montaser
Blocked call
Drive Test Introduction
8/10/2019 3G DT Introduction
38/42
Drive Test Introduction
Prepared by Eng. Ahmed Montaser
4. Blocked call reasons.
Bad Radio condition (Bad RSCP or EcNo or both of them) due to the following:
1) Pilot pollution .
2) Delayed SHO Congestion or wrong SHO parameter definition.
3)Missing neighbor (Bad Rx level).
4) Over shooting.
5) Poor coverage.
Note: all mentioned reasons make a Blocked call in case of no cell reselection from UTRANoccurred.
Congestion.
Drive Test Introduction
8/10/2019 3G DT Introduction
39/42
Drive Test Introduction
Prepared by Eng. Ahmed Montaser
Blocked call due congestion.
Drive Test Introduction
8/10/2019 3G DT Introduction
40/42
Drive Test Introduction
Prepared by Eng. Ahmed Montaser
Hardware problem
Drive Test Introduction
8/10/2019 3G DT Introduction
41/42
Drive Test Introduction
Prepared by Eng. Ahmed Montaser
Hardware problem
8/10/2019 3G DT Introduction
42/42