On the Quality of Experience of SopCast

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On the Quality of Experience of SopCast
Benny Fallica, Yue Lu, Fernando Kuipers, Rob
Kooij, and Piet Van Mieghem
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Introduction

• P2PTV is increasingly popular
• Has P2PTV advantages over IPTV?
• Quality of Service
• Scalability
• Security
• Quality of Experience
• Aim of this talk Discuss Quality of Experience
  of SopCast

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Overview

• Experimental set-up
• Traffic characteristics
• Quality of Experience
• Conclusions

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Experimental set-up

• Source Provider SopCast Server
• Each node SopCast Client, TCPDump, VLC, Perl
  scripts.
• Nodes join and leave, view our TV channel
• Capture traffic at each node. (gt40GB data)
• Capture the received stream at each node
• off-line QoE evaluation.

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Traffic characteristics (1/3)

• Upload and download rate

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Traffic characteristics (2/3)

• Parents upload rate per peer

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Traffic characteristics (3/3)

• Download rate
• Blocking

Y. Lu, F.A. Kuipers, M. Janic, and P. Van
Mieghem, E2E blocking probability of IPTV and
P2PTV, Proc. of IFIP Networking 2008,
Singapore, 2008 (nominated for best paper award).
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Quality of Experience (1/4)

• What? Video Quality in terms of MOS
• How? Use VQM (ITU-T R.144)

• Result Hardly any degradation of video quality

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Quality of Experience (2/4)

• What? Audio-Video synchronization
• How? Use Audio-Video test sequence

• Result audio-video 210 ms out-of-sync

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Quality of Experience (3/4)

• What? Channel Zapping time
• How? Measure through automated script

• Result Zapping time unacceptably high

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Quality of Experience (4/4)

• What? Synchronization among peers
• How? Capture clips at several nodes
  simultaneously

• Result Peer lag of 3 seconds

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Conclusions

• Observation of SopCast traffic characteristics
• Evaluation of various aspects of QoE for SopCast
  users
• Provided many innovative measurement methods

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