MANETs中基于TCP的网络拥塞识别控制算法

Network congestion identification and control algorithm based on TCP for mobile Ad Hoc networks

针对现有TCP协议无法区分MANETs网络性能下降原因的问题,分析移动自组织网络的网络拥塞、MAC层及路由中断等现象出现的可能原因,提出基于短期网络吞吐量(short time throughput,STT)的拥塞识别策略,改进基于带宽估计的慢启动改进算法(improved slow start,ISS),在此基础上提出一种适用于移动Ad Hoc网络的拥塞识别控制算法TCP-AHN(TCP for Ad Hoc networks)。仿真结果表明,TCP-AHN算法在平均窗口拥塞值、网络吞吐量及分组平均重传次数方面优于传统拥塞控制算法,验证了TCP-AHN算法的有效性。

Aiming at the problem that the existing TCP protocol fails to distinguish the reasons which cause the decline of the network performance for mobile Ad Hoc network,after analyzing the possible reasons that cause the decline of network TCP performance,such as network congestion,MAC layer problems and routing interrupt,the congestion identify strategy based on the short time throughput was proposed.And the slow start algorithm based on bandwidth estimation was improved.On this basis,a network congestion control and identification algorithm named TCP-AHN（TCP for Ad Hoc Networks）was proposed.Experimental results show that the TCP-AHN algorithm is better than the traditional congestion control algorithm in the aspects of average window congestion value,network throughput and the average number of packet retransmissions.The simulation verifies the effectiveness of the TCP-AHN algorithm.