Method of Available Bandwidth Estimation for TCP Based on Channel Noise Model

The accurate bandwidth estimation and network model make significant sense for the design of network congestion control scheme. Introducing methodology of noise analysis and channel capacity theory in communication system, a TCP path was regarded as an additive noise channel, where background traffic was considered as noise, then link model and bandwidth estimation algorithm were proposed based on the equivalent noise. The remarkable difference from traditional bandwidth estimation methods is that the algorithm does not utilize the direct filtering the samples, but makes use of stochastic characteristics of network traffic and statistical analysis. At the same time, the bandwidth estimated is bounded with better accuracy and convergence. Theoretical analysis and simulation show that the link model and estimation scheme can work well.