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Energy Consumption of Mobile YouTube: Quantitative Measurement and Analysis

Energy Consumption of Mobile YouTube: Quantitative Measurement and Analysis. Yu Xiao, Ramya Sri Kalyanaraman, Antti Ylä-Jääski Helsinki University of Technology, Finland yuxiao@cc.hut.fi. Outline. Introduction Experiment Setup Experimental Results & Analysis Future Work. Introduction.

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Energy Consumption of Mobile YouTube: Quantitative Measurement and Analysis

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  1. Energy Consumption of Mobile YouTube: Quantitative Measurement and Analysis Yu Xiao, Ramya Sri Kalyanaraman, Antti Ylä-Jääski Helsinki University of Technology, Finland yuxiao@cc.hut.fi

  2. Outline • Introduction • Experiment Setup • Experimental Results & Analysis • Future Work

  3. Introduction • Mobile Devices • Functions vs. Energy Consumption • Multimedia, Internet, Context-aware… • Online video sharing

  4. Introduction • YouTube • Largest online video sharing website • Support access from mobile devices • Website: m.youtube.com

  5. Concerned Techniques • Progressive download • HTTP/TCP • No resource reservation • Media server pushes data to the clients as fast as possible • Client starts playback once enough data has been downloaded Download Playback Playback Download

  6. Research Questions • What are the factors that influence energy consumption? • Download Technology • Progressive download vs. Traditional TCP download-and-play • Network Access Technology • WCDMA vs. WLAN 802.11g • Playback settings • Storage media used (Phone memory vs. External flash drive vs. Cache)

  7. Experiment Setup • Nokia N95 • Symbian 60 3rd FP1 • WCDMA, WLAN • BL-5F 950mAh 3.7V • Nokia Energy Profiler • Monitor voltage, current, temperature • Mobile YouTube Clients • emTube: download • YouTube for Mobile: upload

  8. Network Settings • WCDMA(3G) • Internet subscription with both downlink and uplink bandwidth of 384kbps • WLAN • LINSYS WAP 200 Wireless-G Access Point connected to campus Internet

  9. Progressive download vs. Traditional TCP download –and-play WCDMA WLAN

  10. WCDMA vs. WLAN Progressive Download Upload

  11. Playback

  12. Default system • Concerned factors • Energy Profiling Software • System Processes • Backlight • Cell States of WCDMA • Idle state of WLAN

  13. WCDMA Cell States

  14. WCDMA Cell States

  15. WCDMA Cell States

  16. Progressive download via WCDMA

  17. Progressive download via WCDMA

  18. Progressive download via WCDMA

  19. Progressive download via WCDMA

  20. Calculation • Precondition • Total energy consumption consists of two parts, namely, mobile YouTube and default system • Energy consumption of playback from cache (replay) equals to that of playback during progressive download • Expected quantity • Energy consumption of download, playback and default system in each phase

  21. Argument -1 • Progressive download via WLAN is more energy-efficient than using WCDMA • Energy consumption during progressive download can be separated into download , playback and default system

  22. Argument-2 • Network Transmission • The data rate is not limited by local processing capability • Traffic regulated by YouTube server • Energy consumption of playback • Error caused by temperature in limited range can be ignored • Difference caused by loading video into cache among media used

  23. Future work • Power modeling of progressive download • Power measurement in public WLAN • Power vs. data rate • Energy vs. traffic distribution • Energy efficient adaptation to network conditions • SNR-based dynamic adaptation

  24. Thanks!

  25. Public WLAN

  26. Progressive download WLAN WCDMA

  27. Establishment of TCP Flash Video Download Media Server

  28. Downlink in WLAN

  29. Local playback

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