延迟容忍网络中基于复制率的拥塞控制算法  

Congestion Control Strategy Based on Copy Rate in DTN

作　　者：刘期烈[1,2] 潘英俊[1] 李云[2] 赵玲[2] 

机构地区：[1]重庆大学光电技术及系统教育部重点实验室,重庆400044 [2]重庆邮电大学移动通信重点实验室,重庆400065

出　　处：《北京邮电大学学报》2010年第4期88-92,共5页Journal of Beijing University of Posts and Telecommunications

基　　金：国家自然科学基金项目(60702055);重庆市教委项目(KJ090521);重庆邮电大学基金项目(A2009-28)

摘　　要：为了解决延迟容忍网络中现有Drop-Front(DF)、Drop-Oldest(DO)等拥塞控制算法吞吐量较低的问题,提出了一种在传统的传染路由协议下基于复制率的拥塞控制算法.当节点接收新数据包缓存发生拥塞时,节点根据数据包的复制次数和已经过的生命周期估算各数据包的复制率,并丢弃复制率最大的数据包,从而缓解拥塞.仿真结果表明,该算法较DF和DO算法降低了网络的丢包率,提高了网络的吞吐量,有效地缓解了拥塞.In order to solve the problem of the low throughput of the drop-front （ DF） and drop-oldest （ DO） in delay tolerant networks （ DTN） ,an enhanced congestion control strategy is proposed under conventional epidemic routing,that is called drop copy rate （ DCR） . When the congestion of node happening,the copy rates of packets stored in buffer and arrived at this node at the same time are calculated, according to the copy numbers ,the lapse time and the packet that has the highest copy rate will be deleted,and then the congestion can be relieved. Simulations indicate that DCR decreases the packet loss ratio,and improves the throughput,and relieves congestion effectively of the networks compared to DF and DO.

关 键 词：延迟容忍网络 传染路由 拥塞控制 复制率 

分 类 号：TN929.53[电子电信—通信与信息系统]