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

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.