A Sender Side Algorithm for Handling Retransmission Timeouts of TCP NewReno over Multi-hop Wireless Networks

In today´s Internet, New Reno is the most widely deployed connection oriented transport layer protocol. However, the performance of New Reno degrades significantly when New Reno operates in Multi-hop Wireless Networks (MWNs). Frequent retransmission timeouts, which is one of the well-known problems of the performance degradation of New Reno over MWNs. In MWNs, retransmission timeout is unavoidable when multiple packets are lost from one window of data during fast recovery. In this paper, we propose a sender side algorithm, called SRA (Sudden Recovery Algorithm) for handling retransmission timeouts due to the multiple losses of newly sent packets during fast recovery and thereby improve the performance of New Reno over MWNs. Simulation results show that SRA achieves significant improvements in throughput than current TCP versions especially when retransmission timeouts happens during fast recovery.