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The Delay-Friendliness of TCP

Brosh, Eli; Baset, Salman Abdul; Misra, Vishal; Rubenstein, Daniel Stuart; Schulzrinne, Henning G.

Traditionally, TCP has been considered unfriendly for real-time applications. Nonetheless, popular applications such as Skype use TCP due to the deployment of NATs and firewalls that prevent UDP traffic. This observation motivated us to study the delay performance of TCP for real-time media flows using an analytical model and experiments. The results obtained yield the working region for VoIP and live video streaming applications and guidelines for delay-friendly TCP settings. Further, our research indicates that simple application-level schemes, such as packet splitting and parallel connections, can significantly improve the delay performance of real-time TCP flows.

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Academic Units
Computer Science
Publisher
Department of Computer Science, Columbia University
Series
Columbia University Computer Science Technical Reports, CUCS-023-07
Published Here
April 27, 2011
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