S. Prasanthi
ABSTRACT
Transmission Control Protocol (TCP) is the most popular transport layer protocol used in the current internet. However, the end-to-end throughput of TCP degrades significantly with increase in number of hops in multi-hop wireless networks. Improving the performance of TCP from frequent retransmission timeouts, which is one of the well-known problems of the end-to-end throughput degradation of TCP over multi-hop wireless networks. The loss of newly sent packets during fast recovery cannot be recovered by fast retransmission, if the sender does not have enough duplicate acknowledgments and this may lead to retransmission timeouts. In this paper, we propose a new TCP mechanism, called R-RTO (Reduction of Retransmission Timeouts) having the features of TCP NewReno, which is capable of recovering packets without waiting for retransmission timeouts and thereby increase the throughput of TCP. Our proposed mechanism consists of two schemes, called Rapid Retransmission (RR) and Estimation of Available Bandwidth (EAB). Through extensive simulations using qualnet 4.5, the results show that our mechanism achieves 10--30% improvement than key existing TCP variants.
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