混合网络下的TCP拥塞控制跨层优化算法  

Cross-layer algorithm for TCP congestion control over hybrid network

作　　者：刘清[1] 葛万成[1] 

机构地区：[1]同济大学中德学院,上海200092

出　　处：《信息技术》2014年第2期36-40,共5页Information Technology

基　　金：德国罗德与施瓦茨公司资助

摘　　要：针对混合网络中并行链路间TCP流的不公平性,提出一种新的算法。此算法利用跨层设计的思想,以传输层的数据重传率为参数来调整TCP流不公平性,也就是说MAC层上的竞争窗口将根据重传率的动态变化而改变,其目的在于抑制并行链路TCP流接入信道能力的不公平性。并且用仿真工具NS2进行仿真的结果表明,采用改进算法后的网络公平性指数比未改进前提高了17.9%。该算法能明显改善并行链路间TCP流的不公平性。Considering the fairness and efficiency of TCP mechanism in wired ＆ wireless hybrid networks, this paper proposes that dynamically adjustirig the size of congestion window according to the data retransmitting rate in TCP protocol to make each node share the channel with fairness and efficiency. The algorithms are simulated with the software tool NS2. With the improved algorithm the network fairness index hecomes 17.9% higher than the unmodified. The simulation resuk shows it is the feasibility and effectiveness for the proposed algorithm.

关 键 词：跨层映射算法 混合网络 TCP 公平性 

分 类 号：TP393.07[自动化与计算机技术—计算机应用技术]