Optimized TCP Congestion Control Protocol

The objective of the Transmission Control Protocol (TCP) is to

provide reliable end-to-end delivery of data over unreliable networks. Over

the past few years, the problem of congestion control has received widespread

attention, both in the Internet as well as in the ad-hoc network context.

In these networks, however packet losses occur more often due to unreliable

links than to congestion. But each packet loss on the wireless link results in

invoking congestion control measures at the source, which leads to severe

performance degradation of the TCP.

Many authors have reported that the TCP interacts with the lower

layers, but still it cannot predict route failures and network congestion. On the

other hand, considerable research has been carried out to show how the TCP

performance is significantly affected by MAC protocols in multi-hop & adhoc

networks.

The issues discussed above, with the possibility of further avenues

for improving the TCP performance in multihop wireless networks, served as

the motivation and basis for the proposed work. The proposed work describes

the efficient techniques in various layers to improve the TCP performance

over wireless networks. In the data link layer, the link RED (Random Early

Discard) technique seeks to react earlier to link overload, and it solves the

hidden terminal problem. As well as, the Adaptive Pacing Technique seeks to

improve spatial reuse, and it solves the exposed terminal problem.