一种3GPP LTE网络的TCP拥塞控制方法  

Cross-Layer Transmission Control Protocol congestion control algorithm over 3GPP Long Term Evolution networks

作　　者：胡子骥[1] 王旭[1] 胡波[1] 冯辉[1] 杨涛[1] 

机构地区：[1]复旦大学电子工程系,上海200433

出　　处：《信息与电子工程》2012年第6期664-669,共6页information and electronic engineering

基　　金：国家重大专项基金资助项目(2011ZX03003-001-02);(2012ZX03001007-003);(2010ZX03002-003-01);华为合作基金资助项目(YBWL2010190)

摘　　要：现有的传输控制协议(TCP)拥塞控制机制源自有线网络,未考虑无线基站介质访问控制(MAC)层调度器的特性,影响了TCP协议在长期演进(LTE)系统上的传输性能。提出一种跨层的TCP拥塞控制方法,由MAC层和TCP共同解决TCP虚假超时问题。此方法中,MAC层提供超时信息,TCP层识别出虚假超时后调整数据速率,从而避免系统性能损失,保证MAC层稳定工作。仿真结果表明,在保证用户公平性的同时,新方法可以有效解决虚假超时问题,提高用户实际吞吐量。Next-generation mobile broadband networks,3GPP Long Term Evolution（3GPP LTE）,relies on Media Access Control（MAC） Layer scheduling techniques to achieve great system throughput.However,scheduling can have adverse effects on the congestion control mechanisms of existing Transmission Control Protocol（TCP） and lead to TCP spurious timeout,which will lower the TCP goodput.A cross-layer TCP congestion control algorithm,named TCP-MAC-CW（MAC-layer Congestion Warning）,is proposed to solve problems caused by spurious timeout.The proposed TCP-MAC-CW first detects spurious timeout according to the congestion warning sent by eNodeB MAC Layer,and then adjusts the TCP data rate to improve goodput.Simulation result on LTE simulation platform shows that the proposed TCP-MAC-CW achieves much more goodput gain compared to other existing mechanisms,while maintaining satisfied TCP-level fairness.

关 键 词：TCP拥塞控制机制 3GPP-LTE网络 跨层优化 MAC层调度机制 虚假超时 

分 类 号：TN929.5[电子电信—通信与信息系统]