改进TCP拥塞控制算法的仿真及应用研究  

Simulation and Application of Wireless Network Congestion Control

作　　者：李涛[1] 

机构地区：[1]江苏科技大学张家港校区网络信息中心,江苏张家港215600

出　　处：《计算机仿真》2011年第6期181-184,197,共5页Computer Simulation

摘　　要：研究网络拥塞优化控制问题。由于网络承载量猛增,产生堵塞,延迟增加,使网络效率降低。传统网络的TCP拥塞控制算法不能区分网络拥塞和网络随机错误丢包,导致网络带宽利用率低,网络拥塞严重,甚至导致网络崩溃。为了降低网络拥塞的概率,提出了一种改进的TCP拥塞控制算法。改进的网络拥塞控制算法首先通过对网络状态进行预测,能够有效区分网络拥塞和网络随机错误丢包,同时对TCP网络拥塞控制算法的拥塞避免、快速重传和快速恢复机制进行改进,改善网络性能。最后采用NS2仿真器对算法进行仿真,实验结果表明,提高了网络平均吞吐量,带宽利用率更高,很好的避免了网络拥塞。Study on the wireless network congestion control problem.Traditional wireless network TCP congestion control algorithms cannot distinguish lost packages of the network congestion and network random errors,causing the low network bandwidth utilization rate,and the network congestion is very serious,sometimes even leads to network collapse.In order to reduce the probability of network congestion,an improved TCP congestion control algorithm is proposed.The control algorithm can effectively distinguish the lost packages of network congestion and network random errors based on network states.At the same time,the mechanisms of congestion avoidance,rapid retransmission and rapid recovery of the traditional TCP network congestion control algorithm were ameliorated to improve the performance of the network.The improved network control algorithm is tested based on the simulator NS2,and the experimental results show that the algorithm enhances the network bandwidth utilization and improves the average throughput,and avoids the wireless network congestion.

关 键 词：网络 拥塞控制 网络测量 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]