Performance improvement of reliable TCP using cross - layer interaction in multihop wireless networks

Transmission control protocol (TCP) assumes a relatively underlying network where more packet loss is due to congestion. In a wireless network packet losses will occur more often due to unreliable wireless links. When TCP is used over-wireless networks, each packet loss on the wireless link results in congestion. Congestion control mechanisms have to be applied, after finding out the reasons for packet loss in wireless networks. This paper describes two techniques to improve TCP performance over multihop wireless networks. The link RED (LRED) technique seeks to react to link overhead. The adaptive pacing technique seeks to improve spatial reuse. Performance analysis of TCP over wireless networks are done using network simulator. Here the throughput and end-to-end delay are the parameters for analysis.