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
3
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
8
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?