Reasonable TCP´s Congestion Window Change Rate to Improve the TCP Performance in 802.11 Wireless Networks

Improving TCP performance has long been the focus of many research efforts in 802.11 wireless networks study. Hop-count and round trip time (RTT) are the critical sources which serious affect the TCP performance on end-to-end connection. In this paper, we analytical derived the affection and based on the analysis we propose TCP should change its expected value (TCP-CEV) when hop-count and RTT change by setting a reasonable CWND change rate to improve the performance. The proposed scheme is applicable to a wide range of transport protocols using the basic TCP mechanism, and the protocol behavior is analytically tractable. We show that our simple strategy improves TCP performance at least over 12% in a chain topology and improve the TCP convergence.