This document discusses optimization of networks using TEMS (Test Mobile System) drive testing. TEMS collects measurement data from the network including cell information, signal strength, quality metrics and neighboring cell information. The collected logs can be analyzed to identify issues like dropped calls, handover failures or bad coverage/signal strength. Layer 3 messages in the logs like system information, measurement reports and handover messages can provide additional insights.

1. Asif Haider
Habib Awan

2. OPTIMIZATION
Optimization is intended to provide the
best network quality using available
resources as efficiently as possible

3. INTRODUCTION TO TEMS
• Drive testing is the most common and
maybe the best way to analyze Network
performance.
• Drive testing is basically recording
measurement data which can also be
analyzed afterwards.
• It gives idea about what’s happening with
a subscriber point of view.

4. CONTENTS
The information provided by TEMS is displayed
in status windows. This information includes
• cell identity, base station identity code, BCCH
carrier ARFCN, mobile country code, mobile
network code and the location area code of the
serving cell.
• There is also information about RxLev, BSIC and
ARFCN for up to six neighboring cells;

5. CONTENTS
• channel number(s), timeslot number, channel type
hopping channel indication, mobile allocation index offset
and hopping sequence
• RxLev, RxQual, FER, DTX down link, TEMS Speech
Quality Index (SQI), timing advance (TA), TX Power,
radio link timeout counter and C/A
• parameters for the radio environment.
• The signal strength, RxQual, C/A, TA, TX Power, TEMS
SQI and FER of the serving cell and signal strength for
two of the neighboring cells can also be displayed
graphically in a window.

6. USING SOFTWARE
• Tailored settings
• Default tabs
• Basic windows
• Maps—gst
• Recording properties
• Exporting log files
• Report generation

7. ANALYSIS OF LOG FILES
Analysis is the most important part. Lets
look at some of the cases.
• Dropped call - Nbr not defined
• Dropped call – RL Timer expires
• HO Failure

8. Lack of Dominant Server
Signals of more than one cell can be
reaching a spot with low level causing ping
pong handovers. This might happen
because the MS is located on the cell
borders and there is no any best server to
keep the call.

10. Drop Call due to Bad Coverage
• Call is dropped because of poor coverage.
• The signal level goes down below the
minimum signal level that system could
carry on

12. Bad Quality due to Signal
Strength
• FER is Bad
• FER is good implies no obviuos
interference in the area.

13. LAYER 3 MESSAGES

15. Layer 3 Messages
• SYS INFO
• Measurement Reports
• Sync Messages
• Paging Messages
• Handover
• Call Setup
etc

17. IDLE
DEDIC

49. Measurement Reports

50. SYNC CHANNEL INFO

51. Paging Request Message

52. QUESTIONS
• REFERENCES
• TEMS Log File Analysis
• ARI-Nortel
• Nokia BSS parameters