一种实现MAC层冲突反馈的跨层TCP拥塞控制机制  

A Cross Layer TCP Congestion Control Mechanism Based on Collision Ration at MAC Layer

作　　者：戚龙飞[1] 雷磊[1] 陈楚碧 朱钢[1] 董涛[2] 

机构地区：[1]南京航空航天大学电子信息工程学院,南京210016 [2]航天恒星科技有限公司(503所),北京100086

出　　处：《小型微型计算机系统》2015年第2期257-260,共4页Journal of Chinese Computer Systems

基　　金：国家自然科学基金项目(61100195;61301103)资助;南京航空航天大学研究生创新基地(实验室)开放基金项目(kfjj120113)资助;中国航天科技集团公司卫星应用研究院创新基金项目(2014_CXJJ-TX_09)资助

摘　　要：详细分析了传统的TCP拥塞控制算法在无线多跳网络环境下面临的问题,指出无线多跳环境下的MAC层信道竞争以及TCP拥塞窗口的过激增长机制是影响TCP性能的主要原因,提出一种新的TCP跨层拥塞控制机制TCP-CR.该机制中节点通过MAC层维护的链表信息,将冲突概率定时向源节点的传输层进行反馈,源节点根据获取的反馈信息做出拥塞窗口调整.仿真结果证明,该机制中源节点能有效根据当前MAC层网络状况做出及时动态调整,从而提高TCP的吞吐量.In this paper, we have a detailed analysis of the problems when traditional TCP congestion control mechanism encounters in wireless multihop networks. We find that the main reason is medium contention at the MAC layer and overshooting congestion win- dow. We propose a new cross layer solution called TCP based on collision ratio protocol （ TCP-CR ）. Based on this mechanism, a node can feed back collision ratio to its source node periodically through its chain at MAC layer. Thus source node can adjust its congestion window from the feedback information. Simulation results show that our proposed protocol can effectively adjust the amount of out- standing data based on the level of current medium contention and significantly improve the throughput of the network.

关 键 词：无线多跳网络 TCP 拥塞窗口 信道竞争 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]