多个TCP连接的拥塞丢包模型

本文提出了有关TCP连接的拥塞丢包分析模型.网络瓶颈一般承载许多TCP连接,瓶颈处不可避免的拥塞和缓存溢出,是导致网上丢包的主要原因.网络瓶颈处的行为很大程度上左右了网络性能.本文的模型估计了存在大量持续TCP连接时,网络瓶颈的丢包概率和网络传输中断概率,给出了对实际网络的良好近似.这对于研究TCP对网络性能的影响,提出改善网络性能的新算法,以及分析(从长远来看)TCP还应做哪些改进,都是非常有用的.

Packet-Dropping Model of Multiple TCP Connections

In this paper,we propose an analytical model for the dropping behavior at the network bottleneck where large number of TCP (Transmission controd protocol) connections exist.The inevitable congestion and buffer overflow at the bottleneck is the main reason of the packet loss in networks,which has great influence on the network performance.This model predicts the packet loss rate and transmission interruption rate of the sustained TCP connections sharing the bottleneck link.If most packet-losses are caused by network congestion,our models can give close approximations to the real networks that always contain many connections.The analytical model is useful in studying the effects of TCP,finding new effective algorithm of congestion control,and determining how TCP needs to be modified in the long term for efficient operation over emerging networks.