RESEARCH ON TCP/IP CONGESTION CONTROL BASED ON NS-2 NETWORK SIMULATION PLATFORM

Abstract

The emergence of the Internet facilitates people's lives. Although the network bandwidth increases rapidly, channel resources are limited and network congestion is bound to occur. In order to alleviate network congestion and improve service quality, this paper simply introduced four transmission control protocol (TCP) congestion control algorithms and network simulation-2 (NS-2) network simulation platform for simulating the network environment. Then the performance of four TCP congestion control algorithms in congested network and high bandwidth networks is simulated and analyzed on NS-2 simulation platform. The results showed that TCP Vegas has stable performance in both congested and high-bandwidth networks, and not only the change of cwnd is stable, but also the total number of packets sent and the average throughput are more, and the packet loss rate is 0; the performance of the other three algorithms is consistent in high bandwidth network, In crowded networks, TCP Tahoe performs worst, TCP Reno performs generally, and TCP SACK performs well; TCP Vegas performs poorly on average latency. In summary, TCP Vegas can be used stably in congested networks and high bandwidth networks, but considering the average delay, it is more inclined to apply the other three algorithms in high bandwidth networks.