1. Why Hassaan’s room does not have service? ELEC-E7120 - Wireless Systems Group 11 Levent Kartal Zhengwu Lu Muhammad Mohsin Janne Jaanila 14.10.2015

2. The case Jämeräntaival 1 Weak signal inside Hassaan’s apartment Especially near the door Operators (3G) –Saunalahti (Elisa) and TeliaSonera Received signal power measured at different locations around JMT1 Data rate (Speedtest) Locations of the BSs –Direction (OpenSignal) –Exact location was found by following signal strength Okumura-Hata COST231 to calculate path losses of BSs

3. General Architecture of Building

4. Confirmed 3G base stations

5. Surroundings of the building

6. Statistical View, Elisa

7. Surroundings of the building A B C

8. Statistical View, Sonera

9. Elisa vs. Sonera During the day, Sonera had better signal power. At night, signal powers evened out. Average signal powers were similar. No big difference in data rates. Sonera might reduce the transmitting power of the BTS during the night.

12. Correlation between signal power and data rate - Elisa vs. Sonera R = 0.81R = 0.55

13.  Theoretical path losses calculated with Okumura-Hata extended model default frequency (1800 MHz)  Two BTSs, the estimated corresponding heights: a)16m and b) 20m  MSs on floor level with height 1.5m. One exception: On 4th floor, height: 20.356m Calculated with the standard for residential building: H= 3.1s + 7.75 + 1.55(s/30) Theoretical calculation and Hata model

14.  Distances between BTSs and MSs: a) 295m b) 326m  Four different scenarios with corresponding path losses: a) i. 108.41ii. 107.41 b) i. 54.09ii. 53.09

15. The main problem is a combination of penetration loss and shadowing. The building lies in a bad spot. The building shadows inner court windows from the best BTS. Solution WiFi as alternative Repeater (Not recommended). Change of Antenna Site Larger solutions would be overscaled/expensive for this small area. Conclusion

16. Thanks! Questions?