针对TCP W estwood算法(简称为TCPW)在同一窗口多个分组丢失的网络环境下吞吐量显著下降的缺陷,通过改进TCPW快速恢复机制,提出了一种新算法TCPW FR,并详细进行了仿真验证。仿真结果表明:TCPW FR不仅保持了TCPW对无线环境的优良特性,而...针对TCP W estwood算法(简称为TCPW)在同一窗口多个分组丢失的网络环境下吞吐量显著下降的缺陷,通过改进TCPW快速恢复机制,提出了一种新算法TCPW FR,并详细进行了仿真验证。仿真结果表明:TCPW FR不仅保持了TCPW对无线环境的优良特性,而且有效提高了随机丢失率较高网络环境下的吞吐量。展开更多
TCP W estwood在慢启动和线性递增部分依然采用传统Reno的盲目递增的机制,导致发送端较为频繁的重传。在TCP W estwood和TCP Vegas的基础上提出一种TCP增强算法,可以明显减少分组重传,提高有效吞吐量,更有效地利用瓶颈带宽。并通过网络...TCP W estwood在慢启动和线性递增部分依然采用传统Reno的盲目递增的机制,导致发送端较为频繁的重传。在TCP W estwood和TCP Vegas的基础上提出一种TCP增强算法,可以明显减少分组重传,提高有效吞吐量,更有效地利用瓶颈带宽。并通过网络仿真工具NS2验证了其在吞吐量、丢失率等方面的增强性能。展开更多
The wireless network is limited by the transmission medium,and the transmission process is subject to large interference and jitter.This jitter can cause sporadic loss and is mistaken for congestion by the congestion ...The wireless network is limited by the transmission medium,and the transmission process is subject to large interference and jitter.This jitter can cause sporadic loss and is mistaken for congestion by the congestion control mechanism.The TCP Westwood protocol(referred to as TCPW)is such that it cannot distinguish between congestion loss and wireless jitter loss,which makes the congestion mechanism too sensitive and reduces bandwidth utilization.Based on this,the TCPW protocol is modified based on the estimate of the Round-Trip Time(referred to as RTT)value-called TCPW BR.The algorithm uses the measured smooth RTT value and divides the congestion level according to the weighted average idea to determine congestion loss and wireless jitter loss.The simulation results show that the TCPW BR algorithm enhances the wireless network’s ability to judge congestion and random errors.展开更多
基金国家自然科学基金(the National Natural Science Foundation of China under Grant No.70571017)广西自然科学基金(the Natural Sci-ence Foundation of Guangxi Chuang Autonomous Region of China under Grant No.0728099)
文摘针对TCP W estwood算法(简称为TCPW)在同一窗口多个分组丢失的网络环境下吞吐量显著下降的缺陷,通过改进TCPW快速恢复机制,提出了一种新算法TCPW FR,并详细进行了仿真验证。仿真结果表明:TCPW FR不仅保持了TCPW对无线环境的优良特性,而且有效提高了随机丢失率较高网络环境下的吞吐量。
文摘TCP W estwood在慢启动和线性递增部分依然采用传统Reno的盲目递增的机制,导致发送端较为频繁的重传。在TCP W estwood和TCP Vegas的基础上提出一种TCP增强算法,可以明显减少分组重传,提高有效吞吐量,更有效地利用瓶颈带宽。并通过网络仿真工具NS2验证了其在吞吐量、丢失率等方面的增强性能。
基金The paper is funded by Guangdong Provincial Department of Education major scientific innovation project characteristics(natural sciences),project number:2014KTSCX210。
文摘The wireless network is limited by the transmission medium,and the transmission process is subject to large interference and jitter.This jitter can cause sporadic loss and is mistaken for congestion by the congestion control mechanism.The TCP Westwood protocol(referred to as TCPW)is such that it cannot distinguish between congestion loss and wireless jitter loss,which makes the congestion mechanism too sensitive and reduces bandwidth utilization.Based on this,the TCPW protocol is modified based on the estimate of the Round-Trip Time(referred to as RTT)value-called TCPW BR.The algorithm uses the measured smooth RTT value and divides the congestion level according to the weighted average idea to determine congestion loss and wireless jitter loss.The simulation results show that the TCPW BR algorithm enhances the wireless network’s ability to judge congestion and random errors.
