| PhD Seminar

Name of the Speaker: Mr. Sreekanth Prabhakar CM (EE20D005)
Guide: Dr. Gaurav Raina
Online meeting link: https://meet.google.com/fai-kjzz-dak
Date/Time: 24th July 2025(Thursday), 12 PM
Title: Stability analysis and design considerations for Transmission Control Protocol (TCP)

Abstract :

Transmission Control Protocol (TCP) continues to be the dominant transport protocol on the Internet. The stability of fluid models has been a key consideration in the design and performance evaluation of TCP and queue management systems. This talk will discuss some sufficient conditions for the local stability of a generalized TCP algorithm in the presence of heterogeneous round-trip delays. A critical aspect is the scalability of the design considerations, as the systems scale from single to multi-bottleneck networks. Sufficient conditions derived in this work scale across networks with one, two, and many bottleneck links. Within the generalized TCP model, we consider three specific variants of TCP: TCP Reno, Compound TCP, and Scalable TCP, along with intermediate and small buffer regimes, with Drop-tail queues. The small buffer regime has the advantage that it offers decentralized sufficient conditions where local stability can also be ensured. Based on the stability analysis, some design considerations are formulated for TCP algorithms. In a small buffer regime, TCP algorithms that follow these design considerations can provide stable operation irrespective of the number of bottleneck links or feedback delays in the network.