Enhancing TCP Performance over Wireless Network with Variable Segment Size

摘要

In wireless network, non-congestion loss due to data corruption by channel noise is more frequent than in wired network. Sine TCP does not distinguish loss types, congestion loss and non-congestion loss, it applies congestion control to non-congestion loss and that reduces the TCP throughput. Many approaches such as split-connection and end-to-end schemes were suggested to solve this problem of TCP over wireless network. They distinguishes loss types and apply congestion control to congestion loss only. However, they do nothing for a non-congestion loss. In this paper, we propose a novel transport protocol for wireless networks, Variable Segment size Transmission Control Protocol (VS-TCP), which has a reaction mechanism for a non-congestion loss. VS-TCP uses non-congestion loss rate to enhance TCP as it indicates the degree of wireless interference. Our simulation shows that the segment variation mechanism of VS-TCP achieves a substantial performance enhancement.