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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 [email protected]. Outline. Introduction Experiment Setup Experimental Results & Analysis Future Work. Introduction. - PowerPoint PPT Presentation
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Energy Consumption of Mobile YouTube: Quantitative Measurement and Analysis
Yu Xiao, Ramya Sri Kalyanaraman, Antti Ylä-JääskiHelsinki University of Technology, Finland
Outline
• Introduction •Experiment Setup•Experimental Results & Analysis•Future Work
Introduction
•Mobile Devices▫Functions vs. Energy Consumption▫Multimedia, Internet, Context-aware…
•Online video sharing
Introduction
•YouTube▫Largest online video sharing website▫Support access from mobile devices
Website: m.youtube.com
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
DownloadDownloadPlayback Playback
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
• 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•WCDMA(3G)
▫Internet subscription with both downlink and uplink bandwidth of 384kbps
•WLAN▫LINSYS WAP 200 Wireless-G Access Point
connected to campus InternetMax Data Rate
54Mbps Beacon Interval
100ms
Downlink 5455kbps Uplink 1429kbps
RTT 92ms U-APSD Disabled
Progressive download vs. Traditional TCP download –and-play
WCDMA WLAN
WCDMA vs. WLAN
Progressive Download Upload
Playback
1.452W 1.426W 1.451W
Default system
▫Concerned factors▫Energy Profiling Software▫System Processes▫Backlight▫Cell States of WCDMA ▫Idle state of WLANState WCDMA WLAN Power(Watt)
1 Disabled Disabled 0.270
2 Disabled Idle 0.376
3 CELL_DCH Disabled 0.741
4 CELL_PCH Disabled 0.282
5 CELL_FACH Disabled 0.549
WCDMA Cell States
WCDMA Cell States
WCDMA Cell States
Progressive download via WCDMA
Progressive download via WCDMA
Progressive download via WCDMA
Progressive download via WCDMA
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
•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
playback download default system
WLAN 275.079J 57.448J 91.368J
WCDMA 275.079J 159.748J 175.563J
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
•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
Thanks!
Public WLAN
Progressive download
Phase Playback Download Default system
1 0 1.240W 4.960J 0.376W 1.504J
2 1.137W 122.751J
0.486W 52.488J 0.376W 40.608J
3 1.154W 152.328J
0 0.376W 49.256J
Total 1.156W 275.079J
0.513W 57.448J 0.376W 91.368J
WLAN
Phase Playback Download Default system
1 0 0.940W 9.400J 0.741W 7.410J
2 1.150W 231.227J
0.748W 150.348J
0.741W 148.941J
3 1.154W 43.852J 0 0.701W 26.622J
Total 1.151W 275.079J
0.757W 159.748J
175.563J
WCDMA
Establishment of TCP Flash Video Download
Media Server
Downlink in WLAN
Local playback