Presentation of the Group Assignment

ELEC - E7120 Wireless systems

Group 7

Ricardo Alberto (519627)

Suraj Gachhadar (546179)

Katariina Aaltonen (85094P)

Sewda Biza (464015)

Outline

• The Problem

• Our Assumptions

• Applications Used

• Measurements

• Conclusions

• Solutions

• Improvements

Outline

• The Problem

• Our Assumptions

• Applications Used

• Measurements

• Conclusions

• Solutions

• Improvements

The Problem

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The Problem

Location: – In the middle of Lauttasaari

– On the top of a hill, highest point of the islandProblems:– Bad data connection

– Bad quality of phone calls

– Rare dropped phone callsOperator used: – Sonera was used to this study, also problems with other operators

Outline

• The Problem

• Our Assumptions

• Applications Used

• Measurements

• Conclusions

• Solutions

• Improvements

Our Assumptions

Due to the church being located in a cell-edge area of the network, the penetration loss of the walls create the problem

There are some big trees around the church that may also attenuate the signal

The location of the church (top of a hill), can make the attenuation be higher

Due to the area being urban, shadow fading of the buildings may also decrease the quality of the signal

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Outline

• The Problem

• Our Assumptions

• Applications Used

• Measurements

• Conclusions

• Solutions

• Improvements

Applications Used

Network Signal Info

4,2/5 (23 319)

by Andreas Kraemer, KAIBITS Software

Netradar

3,7/5 (141)

by Kaista Networks

Network Signal Strength

4,1/5 (4122)

by Laksman

Outline

• The Problem

• Our Assumptions

• Applications Used

• Measurements

• Conclusions

• Solutions

• Improvements

Measurements

Measurements (1)

Inside the church

Measurements (2)

Inside the church

Measurements (3)

Penetration loss of the walls 20 dB

Outside Inside

Measurements (4)Point 1 Point 2 Point 3 Point 4 Point 5

Signal Stength

- 81 dBmEDGE

- 110 dBmLTE

- 105 dBmLTE

- 79 dBmLTE

- 69 dBmLTE

Speed DL 134 kbpsUL 49 kbps

DL 10 115 kbpsUL 1 429 kbps

DL 17 286 kbpsUL 3 901 kbps

DL 37 242 kbpsUL 12 515 kbps

DL 88 646 kbps UL 40 328 kbps

Outline

• The Problem

• Our Assumptions

• Applications Used

• Measurements

• Conclusion

• Solutions

• Improvements

Conclutions

We conclude that the penetration loss is indeed a problem but the church is not on the cell edge

The trees apparently do not affect that much since there are buildings in the line of sight between the church and the base station (higher than the trees)

With the measurements we were able to conclude that both the heigth of the church and the shadow fading of the buildings caused a degradation in the signal level

Outline

• The Problem

• Our Assumptions

• Applications Used

• Measurements

• Conclusions

• Solutions

• Improvements

Solutions

To solve the penetration loss problem we need to step outside the church

To solve the shadow fading of the buildings the antenna height of the base station should be higher

A microcell inside the church would improve the signal quality

A relay near the church (preferably in the top of the Hill)

Outline

• The Problem

• Our Assumptions

• Applications Used

• Measurements

• Conclusions

• Solutions

• Improvements

Improvements

• The church was far away from everyone’s house. A extensive measurement campaign would be better to access the results

• We could have asked the operator where were the base stations exactly so we did not have to rely in the network signal info localization

• We could have measured the signal received from other base stations to calculate the SIR ratio

• We could have used different operators

Thank you for your attention!

Questions?