HyCloud: A system for device-to-device content distribution controlled by the cloud

1. HyCloud: A system for device-to-device content
distribution controlled by the cloud
Jiri Danihelka
Co-authors: Dr. Domenico Giustiniano, Dr. Theus Hossmann
ETH Zurich, Communication Systems Group
ETH Zurich, Communication Systems Group 1

2. Motivation – based on Cisco forecast study
 3G cellular networks are going to be overloaded
 mobile data traffic: 78% annual growth rate (up to 2016)
 mobile connection speed: 56% annual growth (up to 2016)
 53% of mobile data is video
 We are looking for new ways how save bandwidth
 Mobile devices can share downloaded video
 Offloading cellular traffic through opportunistic
communications is a promising solution
 WiFi + Bluetooth
 Delay tolerance allows applications to trade-off completion
time for 3G usage.
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3. Use cases for video sharing
 Video content
 live streaming of sport or cultural events
 watching televisions channels
 education video in class
 Non-video content
 audio content
 RSS feeds, tweets, other news
 application updates
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4. What is it about
 saving cellular data
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5. Detailed architecture
 mobile and cloud part
 mobile devices subscribe
to channels
 recording service prepare
content in form of chunks
 dissemination service
controls distribution
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6. Distribution phases
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7. Video dissemination strategy
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playing buffered partially buffered not buffered

8. Automated testing
 measuring dissemination for up to 16 devices
 considering 3 dissemination strategies
 utilization of cloud can improve efficiency
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9. Practical experiment - setup
 Parameters
 16 volunteers at the university
 measured during a work day
 WiFi downloads + Bluetooth dissemination
 Instructions
 Take a mobile phone
 Run the application HyCloud Experiment
 Leave the application in foreground
 Keep the phone with you wherever you go
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10. Practical experiment - results
 24% bandwidth saved
 38% at peak
 graphs for individual
phones
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11. Conclusion
 opportunistic video offloading can save significant amount
of data traffic for popular content
 up to 40% for live video
 even more for less time-sensitive content
 problems
 cannot be applied on all types of data downloads
 need better phone OS integration
 standardization and cross-platform usages
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12. Thank you for your attention
Questions?
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