Fat Virtual Access Points Srikanth Kandula Kate Lin, Tural Badirkhanli and Dina Katabi.
A First Look at Traffic on Smartphones Hossein Falaki Dimitrios Lymberopoulos Ratul Mahajan Srikanth...
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A First Look at Traffic on Smartphones Hossein Falaki Dimitrios Lymberopoulos Ratul Mahajan Srikanth Kandula Deborah Estrin
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Transcript of A First Look at Traffic on Smartphones Hossein Falaki Dimitrios Lymberopoulos Ratul Mahajan Srikanth...
A First Look at Traffic on Smartphones
Hossein FalakiDimitrios Lymberopoulos
Ratul MahajanSrikanth KandulaDeborah Estrin
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Exponential growth in mobile traffic
CISCO VNI 2010http://www.totaltele.com
ratul | IMC | Nov 2010
http://www.readwriteweb.com
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Two ways to understand smartphone traffic
ratul | IMC | Nov 2010
1. Capture at a link in the network
2. Capture on the devices
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Preliminary findings
Browsing, email, media, and maps dominate traffic
Small connection sizes lead to high overhead
Throughput is bottlenecked by path loss and socket buffers at servers
Tuning 3G radio timeout can significantly reduce power use with minimal performance impact
ratul | IMC | Nov 2010
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Datasets in our study
ratul | IMC | Nov 2010
Dataset1 Dataset2
# users 10 33
Platform 8 WM6, 2 Android Android
Traffic granularity Packet-level App-level
Duration (days/user) 26-84 49-147
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Traffic exchanged per day
ratul | IMC | Nov 2010
MB per day
% ofusers(CDF)
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Traffic composition
ratul | IMC | Nov 2010
Bytes (%)
Browsing 58.0
Media 10.8
Messaging (email, IM) 10.3
Maps 8.5
System 5.8
Social networking 4.2
Games 0.4
Productivity 0.2
Other 1.8[Dataset2]
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Transfer sizes are small
ratul | IMC | Nov 2010
Transfer size (KB)
% of transfers
(CDF)
[Dataset1]
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Lower-layer protocols have high overhead
ratul | IMC | Nov 2010
Header overhead (% of bytes)
% ofxfers(CDF)
% ofxfers(CDF)
Handshake overhead (% of time)[Dataset1][Dataset1]
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Traffic throughput is low
ratul | IMC | Nov 2010
Throughput (kbps)
% ofxfers(CDF)
[Connections in Dataset1 with 10+ data packets in a direction]
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Throughput bottlenecks
ratul | IMC | Nov 2010
Uplink (%)
Downlink (%)
Packet loss 81.0 61.5Sender window 4.1 27.4
Receiver window 6.8 3.4Bandwidth 5.1 2.9Transport 0.7 0.0
Application 0.0 0.0Unknown 2.4 4.8
[Connections in Dataset1 with 50+ data packets in a direction]
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Conclusions
Capturing traffic on smartphones provides a rich, detailed view of device traffic
Findings from our preliminary analysis• Browsing, email, media, and maps dominate traffic• Small transfer sizes lead to high overhead• Throughput is limited by loss and socket buffers• Judicious radio timeouts can cut power consumption
ratul | IMC | Nov 2010
