Design and Analysis of Transmission Control Protocol Based on Multiple Vector Fields and Bandwidth Estimation
Date Issued
2005
Date
2005
Author(s)
Fong, Ting-Chun
DOI
en-US
Abstract
This thesis presents three types of frameworks for TCP congestion control. The first two protocols, called “Vegas-like TCP Type I” and “Vegas-like TCP Type II”, respectively, are designed based on the vector field method and inherit the idea from a TCP-Vegas protocol that use RTT (round-trip-time) as a congestion measure. Type I gives a change in the number of switching dynamics of the vector field while Type II keeps the same number of switching dynamics of the vector field as Vegas but with a different style in each of them. The third one, called “Bandwidth-based TCP”, differs from most TCP algorithms by using the bandwidth estimation as the congestion measure to control the window size increment. It tries to predict the equilibrium point of window size then making the congestion window approach this point in a round-trip-time.
In this thesis, an overview of TCP and AQM is given, and some well-known algorithms such as TCP-Vegas and AQM-REM are introduced subsequently. Then, three types of mechanisms are proposed in succession. In addition to giving the ideas, the stability of these mechanisms is also investigated via phase portrait method and linearization. Finally, through the simulations, the proposed scheme is shown to have a better performance over TCP-Vegas in adaptability and fairness both under a homogeneous and a heterogeneous environment.
Subjects
TCP之雍塞控制
來回時間長度
向量場
頻寬估測
線性化
Transmission Control Protocol (TCP) congestion control
round-trip-time (RTT)
vector field
bandwidth estimation
linearization
Type
thesis
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