中央研究院  |   資訊科學研究所  |   多媒體網路與系統實驗室 
Can Skype be More Satisfying? -- A QoE-Centric Study of the FEC Mechanism in the Internet-Scale VoIP System
(NOTE: Sheng-Wei Chen is also known as Kuan-Ta Chen.)

Abstract
The phenomenal growth of Skype in recent years has surpassed all expectations. Much of the application's success is attributed to its FEC mechanism, which adds redundancy to the voice streams to sustain audio quality under network impairments. Adopting the quality-of-experience (QoE) approach, i.e., measuring the Mean Opinion Scores (MOS), we examine how much redundancy Skype adds to its voice streams and systematically explore the optimal level of redundancy for different network and codec settings. This study reveals (1) Skype's FEC mechanism, not so surprisingly, falls in the ballpark, but (2) there is surprisingly a significant margin for improvement to ensure consistent user satisfaction.

Citation
Te-Yuan Huang, Polly Huang, Kuan-Ta Chen, and Po-Jung Wang, "Can Skype be More Satisfying? -- A QoE-Centric Study of the FEC Mechanism in the Internet-Scale VoIP System," IEEE Network, Vol. 24, No. 2, March, 2010.

BibTex
@ARTICLE{huang10:skype_fec,
  AUTHOR     = {Te-Yuan Huang and Polly Huang and Kuan-Ta Chen and Po-Jung Wang},
  TITLE      = {Can {Skype} be More Satisfying? -- A {QoE}-Centric Study of the {FEC} Mechanism in the Internet-Scale {VoIP} System},
  JOURNAL    = {IEEE Network},
  VOL        = {24},
  NO         = {2},
  MONTH      = {March},
  YEAR       = {2010}
}
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