摘要
在自适应无线Ad Hoc网络中,现有TCP拥塞控制协议-AIMD在拥塞控制因子-cwnd(Congestion Window)变化上的单一性,易使网络整体性能急剧下降,例如:资源利用率降低、数据流不友好等。针对以上问题,在TCP-Newreno协议上提出了一种cwnd自适应动态变化算法RFTCP,并结合网络吞吐量跨层调整竞争窗口(CW)因子,以解决现有协议在动态Ad Hoc网络中出现的吞吐量小、传播延迟大、资源分配不公等问题。RFTCP算法在NS2的仿真结果中,与TCP-Newreno相比较,明显提升了无线Ad Hoc网络的通信质量。
In the adaptive wireless Ad Hoc networks, the singleness of existing TCP congestion control protocol： AIMD（Addic tive Increase and Multiple Decrease） in congestion decision-making basis easily causes the sharp decrease of network performance such as resource utilization, data stream-friendliness. In order to improving network performance metrics such as throughput, propa- gation delay, fairness, this paper presents an adaptive dynamic algorithm of congestion window and combines with throughput model to determine collision window size. We carry out RFTCP in NS2, and evaluate its performance for a lot of scenarios. The simula tion results show that RFTCP outperforms TCP-Newreno in our wireless scenarios.
出处
《电子技术应用》
北大核心
2014年第5期97-100,107,共5页
Application of Electronic Technique
基金
国家自然科学基金(批准号:61072138)
国防基础科研计划
