1. BitTorrent on Mobile Devices
Syed Safri & Bryan Bajar

2. Introduction BitTorrent Mobile Devices
Fast and efficient method for file transfer
Very popular
Mobile Devices
iPhone and Android
Can BitTorrent run effectively on a mobile device?

3. Related Studies
BitTorrent on a Mobile Device: MobTorrent is the S40 platform (Ekler et al 2008)
SymTorrent client: Nokia Research Centre (Nurminen et al 2008)
A proxy solution (Kelenyi et al 2010)

4. Main Factors Desktop Vs Mobile Devices:
Memory: (near) infinite on Desktop. Limited on Mobile device
Connection
Packet loss: in wireless connection (Coluccia et al 2009)
Churn: reconnection
Battery: limited energy use on mobile Device

5. Methodology Client on Desktop used Considered an optimal case:
Memory: infinite space to store data
Connection
Packet loss: assumed no packet loss
Churn: device is stationary
Battery: Primary limitation
Client on Desktop used
Join regular torrent
Log transfer of data

6. Energy Model
Energy types in 3G Transmission (Balasubramanian et al 2009)
Ramp energy: required energy for interface to be active [3.5 J]
Transfer energy: energy required to send x bytes [0.025 J/Byte]
Tail energy: energy remaining after transfer [0.62 J/s]
Max tail time = 12.5 s

7. Results

8. Results

9. Results

10. Results

11. Results

12. Results

13. Conclusion
File transfer over BitTorrent may be viable for small files (less than 50MB)
File size and energy efficiency don’t appear to be correlated
Energy efficiency asymptotic with amount of peers (~ J/MB)
Energy consumption increased with packet loss and churn