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在无线网络环境下对TCP Reno协议饱和吞吐量建模展开研究.发现现有的饱和吞吐量模型未考虑TCP Reno快速恢复状态,因而在计算拥塞窗口值时存在误差;同时,现有模型未考虑TCP协议等待应答超时后的慢启动状态.针对上述分析,本文以产生数据分组丢失的不同标志事件为依据,分析拥塞窗口与丢包概率以及传输往返时间之间的关系,并在TCP Reno饱和吞吐量模型中引入快速恢复状态.仿真结果证明,本文提出的模型可以更加有效地估计拥塞窗口值,从而准确地得出TCP Reno协议的饱和吞吐量.
We study the model of TCP Reno protocol throughput under wireless network environment.It is found that the existing saturated throughput model does not consider the TCP Reno fast recovery state and thus there is an error in calculating the congestion window value.At the same time, TCP protocol waits for a slow start after the response times out.According to the above analysis, this paper analyzes the relationship between the congestion window and packet loss probability and transmission round-trip time based on the different sign events that generate data packet loss, The fast recovery state is introduced into the quantitative model.The simulation results show that the proposed model can estimate the congestion window value more effectively and get the accurate throughput of TCP Reno protocol.