Analysis of start-up transition dynamics of TCP NewReno

Internet traffic rapidly grows in volume and mainly comes from TCP-related application services. Therefore, many TCP variants have been researched act ively for a long time and among these, TCP NewReno has been proposed to imp rove TCP performance by preventing unnecessary timeout, which results in mu ltiple packet losses. NewReno successfully recovers multiple packet losses without any changes at receivers and removes unnecessary timeout. However, since NewReno can recover only a packet during one RTT, it may take a long time to recover all packet losses and it still suffers performance degradat ion, especially when it experiences multiple packet losses during its start up period. As the network bandwidth grows and applications that use short-l ived TCP connections increase, TCP in the start-up period plays a major rol e in data transfer, and significantly contributes to the overall performanc e. In this paper, we focus on the importance of start-up transition dynamic s of TCP NewReno's with and without partial window deflation (PWD). They ha ve different window reduction mechanisms for recovery when a loss is detect ed, We analyze them in detail and verify our analysis through extensive sim ulations. Among the recovery procedures that are linked with timeout, Fast Retransmit, and Fast Recovery, our work is primarily concerned with the dyn amics of Fast Recovery. (C) 2001 Elsevier Science B.V. All rights reserved.