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TEAR (TCP Emulation At Receiver)

This is the official TEAR page. It contains information about the description of TEAR protocol, its source codes (simulation and real codes), and experimental results.

TEAR Overview

TEAR is a protocol that runs at receivers to estimate TCP-friendly rates. The estimated rates can be used to control the rate of a non-TCP flow. TEAR is suitable for Internet-based multimedia streaming because (1) its rate adjustment is very smooth, and (2) it is TCP-friendly. We can find its application in congestion, and flow control for multicast because most of functionalities are performed at receivers and it is thus very scalable. TEAR is also designed for use in a symmetric networks such as wireless networks (e.g., satellite), ADSL, and Cable modems. In this page, we report some of preliminary results we got from our NS simulation experiments.

Click here to see more details about TEAR
State Transition of TEAR

Download

NS2 Simulation Code

  • TEAR NS2 scripts zip TAR.GZ
  • Simulation study of throughput comparison between TEAR and TFRC. Click here! html

Linux Kernel Patches

  • We have done implementing kernel patches for Linux 2.6, which use common library of Linux DCCP framework. We will post the source codes shortely.

Members

Faculty

  • Injong Rhee

MS Students

  • Volkan Ozdemir

Postdoctorial Fellows

  • Sridhar Ramesh

Visiting Scientists

  • Yung Yi

Publications

  • Injong Rhee, Volkan Ozdemir and Yung Yi, TEAR: TCP emulation at receivers -- flow control for multimedia streaming, Technical Report, Department of Computer Science, North Carolina State University. html HTML ps PS pdf PDF ppt PPT
  • Sridhar Ramesh and Injong Rhee, Issues in Model-Based Flow Control, Technical Report TR-99-15, Department of Computer Science, North Carolina State University. ps PS pdf PDF

-- Main.sha2 - 06 Sep 2007

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Latest News
New Human Movement Model Can Aid In Studying Epidemic Outbreaks, Public Planning
(April 28, 2009)

Dr. Injong Rhee, associate professor of computer science, is developing a new statistical model that simulates human mobility patterns, having a host of potential uses ranging from land use planning to public health studies of disease outbreak.  [full story]

PFLDNet Tokyo, Japan
(May 2009)
Yaogong will present a paper on Netset at PFLDNeT, Tokyo, Japan in May 2009.
INFOCOM, Rio, Brazil
(April 22, 2009)
Sankararaman Janakiraman presented a full paper titled "DiffQ: Practical Differential Backlog Congestion Control for Wireless Networks," at INFOCOM, Rio, Brazil on April 22, 2009.
INFOCOM, Rio, Brazil
(April 22, 2009)
Kyunghan Lee presented a full paper titled "SLAW: A Mobility Model for Human Walks," at INFOCOM, Rio, Brazil on April 22, 2009.
Research data
Research Highligts on DiffQ and demo videos are available .

NS2 and Matlab source codes of two mobility models, SLAW and TLW, are available (link).

 
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