A novel approach to enhance performance of Linux-TCP Westwood on wireless link

Now a day's use of wireless networks for access the Internet is increasing. It shows that use of the main transport layer protocol TCP will be increase in near future. The traditional TCP suffer from packet losses and throughput degradation over wireless link. To improve performance of the TCP, so many variants of the TCP have been proposed like TCP Reno, New Reno, Tahoe, and Westwood etc. But no one has been deploying successfully except TCP Westwood. TCP Westwood shows improvement in throughput over Reno and SACK in wireless network. But TCP Westwood does not differentiate issue of packet loss due to congestion or bit error. So it always decrease cwnd (congestion window) in all issues of packet loss and degrade the performance. This paper proposes a novel approach to improve the performance of TCPW by differentiate issue of packet loss through either congestion or bit error. Modified TCPW uses the flag indication of TCP header for distinguish issue of congestion loss from bit error loss. This paper shows the better performance results of Modified-TCPW after comparing Modified-TCPW and traditional TCPW using network simulator NS-2.35.