TCP Performance Enhancement Using ECN and Snoop Protocol for Wi-Fi Network

Providing Internet services over wireless links has grown rapidly in recent years. TCP (Transmission Control Protocol) has been performing well over the traditional wired networks where packet losses occur mostly because of congestion, it cannot react efficiently in wireless networks, which suffer from significant non-congestion-related losses due to reasons such as bit errors and handoffs. The paper shows how Explicit Congestion Notification (ECN), Snoop protocol and their combination can be used to improve the performance of TCP in Wi-Fi Bi-directional Network and in Handoff. ECN will help in congestion control and SNOOP will retransmit the packets that are lost from nodes in between, saving nearly half the retransmission time and avoiding the decreasing in transmission speed. This paper investigates the performance of above mentioned protocols over Wi-Fi wireless scenario which improves the various parameters of TCP such as throughput and goodput. The results of the same can be demonstrated on NS2 simulator.