Design and Evaluation of a robust delay-based congestion protocol

9 Dec

Prof. Dr. Narasimha Reddy (Cátedra de Excelencia, University Carlos III of Madrid; Visiting Researcher, IMDEA Networks, Madrid; Texas A&M University, USA)

In-house Presentation


Many delay-based congestion protocols have been proposed. Some recent studies have questioned the validity of congestion prediction at end hosts Based on measurement studies. In this talk, we show that end-host based delay prediction can be more accurate than previously characterized. We propose PERT (Probabilistic Early Response TCP) to mitigate the uncertainties in end-host based congestion prediction. PERT emulates the behavior of AQM/ECN in the end hosts’ response to congestion.

In the second part of the talk, we discuss the issues in incremental deployment of PERT in the current Internet where loss-based TCP dominates. We modify PERT to be able to compete with TCP. In addition, we enhance PERT to exhibit better characteristics than TCP in high-speed high-delay networks. We will present results of evaluating PERT on real networks.

Who is Narasimha Reddy?

Narasimha Reddy is a J.W. Runyon Professor in the department of Electrical and Computer Engineering at Texas A & M University. He is currently on sabbatical holding a Banco Santander Catedra de Excelencia at Unviersity of Carlos III, Madrid.

Reddy received the M.S. and Ph.D degrees in Computer Engineering from the University of Illinois at Urbana-Champaign in May 1987 and August 1990 respectively. During 1990-1995, he was a Research Staff Member at IBM Almaden Research Center in San Jose, California.

Reddy holds five patents and was awarded a technical accomplishment award While at IBM. He has received an NSF Career Award in 1996. His honors include an outstanding professor award during 1997-1998, and 2003-2004, a Distinguished Achievement award for teaching from the former students association of Texas A&M University and a citation “for one of the most influential papers from the 1st ACM Multimedia conference”. Reddy is an IEEE Fellow and is a member of ACM.

The conference will be conducted in English


  • Location: Salón de Grados, Auditorio Padre Soler, Universidad Carlos III de Madrid, Avda. Universidad, 30, 28911 Leganés – Madrid
    Fecha: 9 Diciembre 2009, a las 12:00

  • Organization: IMDEA Networks (Madrid, Spain)
  • Time: 12:00am
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