| Transmission Control Protocol (TCP) is used by many standard data application in current wireline networks. It has proven to work well in traditional networks where packets losses are mainly due to network congestion. In the other hand, a totally different scenario is happened in the Wireless link. Due to the high BER, TCP performance is affected. Many corrupted and delayed packets occur in the wireless link that result a poor performance of TCP.; There have been many schemes proposed to improve the performance of TCP over wireless networks. This thesis discusses the behaviour of the TCP over a slow wireless link. The effects of dropping and re-ordering packets are studied. The network is simulated using the network simulator NS, a discrete event simulator targeted at networking research. The modeled link does not suffer from any congestion issues, and there are no intermediate routers where some packets could be dropped due to buffer exhaustion. The behaviour and the performance of different TCP enhancement are compared to the New Reno. The TCP enhancement includes limiting receiver's advertised window, Selective Acknowledgment (SACK) option, Duplicate Selective Acknowledgment (DSACK) option, Limited Transmit, and Initial Window of four segments. |
