The Delay-Friendliness of TCP for Real-Time Traffic

被引：36

作者：

Brosh, Eli ^{[1
]}

Abdul, Salman ^{[1
]}

Misra, Vishal ^{[1
]}

Rubenstein, Dan ^{[1
]}

Schulzrinne, Henning ^{[1
]}

机构：

[1] Columbia Univ, Dept Comp Sci, New York, NY 10027 USA

来源：

IEEE-ACM TRANSACTIONS ON NETWORKING | 2010年 / 18卷 / 05期

基金：

美国国家科学基金会;

关键词：

Live video streaming; measurement; performance modeling; TCP congestion control; VoIP;

D O I：

10.1109/TNET.2010.2050780

中图分类号：

TP3 [计算技术、计算机技术];

学科分类号：

0812 ;

摘要：

TCP has traditionally been considered inappropriate for real-time applications. Nonetheless, popular applications such as Skype use TCP since UDP packets cannot pass through restrictive network address translators (NATs) and firewalls. Motivated by this observation, we study the delay performance of TCP for real-time media flows. We develop an analytical performance model for the delay of TCP. We use extensive experiments to validate the model and to evaluate the impact of various TCP mechanisms on its delay performance. Based on our results, we derive the working region for VoIP and live video streaming applications and provide guidelines for delay-friendly TCP settings. Our research indicates that simple application-level schemes, such as packet splitting and parallel connections, can reduce the delay of real-time TCP flows by as much as 30% and 90%, respectively.

引用

页码：1478 / 1491

页数：14