Improving TCP Protocol Performance over Wireless Networks with the Modified Snoop Protocol.

Abstract

This paper proposes a modified SNOOP protocol to improve TCP performance for
mobile network. The SNOOP protocol utilizes a caching technique implemented in base station to
do fast local retransmission in wireless LAN instead of end-to-end TCP retransmission. The paper
objective is to modify the existing SNOOP protocol to decrease unnecessary timeout that reduces
the congestion window size. The new SNOOP protocol was added with the capability to
acknowledge the received TCP segment in manner of the destination host. The idea is to slow
down the congestion window size reduction method that decreases the transmission rate of TCP
session. As to evaluate the performance of the proposed idea, we implement the protocol into a
simulation model and compare the simulation results with the based model. The simulation results
show that the proposed protocol gain more performance for TCP mobile node compared to the
unmodified SNOOP protocol significantly.