计算机科学 ›› 2015, Vol. 42 ›› Issue (6): 125-130.doi: 10.11896/j.issn.1002-137X.2015.06.028
葛卫民,许文庆,朱海颖,李娟,冉放
GE Wei-min, XU Wen-qing, ZHU Hai-ying, LI Juan and RAN Fang
摘要： 网络编码的出现为改进网络的传输性能提供了新的方法。J.K.Sundararajan等人将网络编码技术与传输控制协议相结合,提出了基于网络编码的TCP/NC协议,其在改进无线网络中传统TCP的性能方面取得了明显效果。但该协议及其改进协议存在的数据传输和解码操作同步性问题会严重影响TCP/NC性能。提出的改进协议TCP/NCW根据解码时间调节解码窗口,以确保数据传输和解码操作同步,从而获得更好性能。运用排队论分析了TCP/NCW最优解码窗口的存在性。在NS2中的仿真结果表明,在静态场景和动态场景下TCP/NCW的吞吐率比TCP/Vegas和TCP/NC有显著提高,同时也具有较好的公平性。
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