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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

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
Outline
  • Introduction
  • Experiment Setup
  • Experimental Results & Analysis
  • Future Work
introduction
Introduction
  • Mobile Devices
    • Functions vs. Energy Consumption
    • Multimedia, Internet, Context-aware…
  • Online video sharing
introduction1
Introduction
  • YouTube
    • Largest online video sharing website
    • Support access from mobile devices
      • Website: m.youtube.com
concerned techniques
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

research questions
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)
experiment setup
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
network settings
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
wcdma vs wlan
WCDMA vs. WLAN

Progressive Download

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default system
Default system
  • Concerned factors
    • Energy Profiling Software
    • System Processes
    • Backlight
    • Cell States of WCDMA
    • Idle state of WLAN
calculation
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
argument 1
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
argument 2
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
future work
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