ELEC-E7120 Wireless Systems

Final presentation by Group 2

Identifying ‘Bad’ Network Coverage Area

Ashutosh Sharma (ID: 547725)

Hamit Taylan YÜCE( ID: )

Resti Montoya Moreno(ID: 465881)

Outline of Presentation

• Introduction• Tools & Software used

• Scenario description• Interpretation of results

• Possible problem• Suggested solutions• Conclusions

Introduction

• Detect possible problems

• Propose some solutions

• Identification of poor coverage region

• Have parameter(s) for identifying poor network area

Tool Area

Problem

Solution

Tools used :

SETTINGS->ABOUT ->STATUS

Software available

Antennas

RF Signal Tracker

Signal check pro

Network Signal Info Pro

Network signal strength

Advanced Signal Tracker

Software(s) used:

RF signal Tracker

App for impromptu handheld drive test with Android phoneMonitors RF signal strength, records and analysis data.

Scenario descriptionOtakaari 5

Otakaari 1

Location chosen

Scenario description

Photos of the Scenario

Results(dBm)

Possible problems

Solution for the future

Coordinated multipoint transmission/reception CoMP One of the most important

technical improvements of LTE-advanced Rel.11

Minimize inter-cell interference for cells that are operating on the same frequency

CoMP categories Joint processing: coordination

between multiple TX/RX entities that are simultaneously transmitting or receiving

Coordinated scheduling or beamforming: single TX/RX point operates at the time

SOLUTION PROPOSALS

FemtoCell

PicoCell

Cid:11643BS B

Cid:12739BS C

Cid:47714BS A Location of

Scenario

FemtoCell

• Small, low-power base station• Plug and Play• Transmit data over Internet• Cheap

• Interference• Supports up to 10 m• Limited space

Cid:12739BS C

Up to last floor of the building, this base station provides signal

But what about ground floor?

No signal received

Approximately -83dBm

INDOOR PROBLEM

Behind the Building

-110dBm

INDOOR PROBLEM

-111dBm

cid:11643BS B

-93dBm

cid:12739BS C

-101dBm

-83dBm

Handover

PicoCell

• Small, low-power base station• Mounted on the wall• Transmit data over Internet• Expensive than FemtoCell

• Interference• Supports up to 100 m

-97 dBm

-91dBm

-105dBm

-107dBm

PicoCell

OUTDOOR PROBLEM

cid:12739Base Station C

Can’t transmit

cid:11643-11644Base Station B-93dBm

cid:47714BS A

Conclusion

• Due to high walls, signal cannot propagate into the area between buildings

• Decrease in received signal power should trigger handover decision• Walls block base station C to transmit signal inside the

building

• In order to increase capacity and coverage• For indoor, femtocells can be deployed• For outdoor, picocells can be deployed