面向内容中心网络的拥塞控制研究  

Research on congestion control of content centric network

作　　者：张文志[1,2] 吴巍 ZHANG Wen-zhi;WU Wei(The 54th Research Institute,China Electronic Technology Group Corporation,Shijiazhuang 050081,China;Key Communication Network Information Transmission and Distribution Laboratory,Shijiazhuang 050081,China)

机构地区：[1]中国电子科技集团公司第五十四研究所,石家庄050081 [2]通信网信息传输与分发技术重点实验室,石家庄050081

出　　处：《信息技术》2018年第7期139-142,147,共5页Information Technology

摘　　要：由于内容中心网络中普遍缓存以及支持多接口转发的特点,一个兴趣包的发出可能导致来自多个数据源或缓存的数据回复。然而,由于兴趣与数据的一一对应要求,晚到达的数据将被丢弃,这边会导致网络中数据出现冗余,增大网络拥塞的可能。针对以上问题,该机制提出了一个基于网络编码和修正的往返时延的拥塞控制算法。首先,利用网络编码混合信息的特点,屏蔽来自多个源的数据差异性,掩盖数据丢包和乱序影响,实现编码包的并行传输,加速数据获取。其次,基于兴趣被满足的往返时延在一定时间段内样本的往返时延极值之间的位置,提出基于网络拥塞程度调整兴趣发送窗口的算法。为了验证所提出算法的有效性,该机制在ndn Sim上进行了仿真实验,对吞吐量指标进行对比。结果显示,该机制在网络丢包率较高,网络状态不好时,仍然能够保持较高的吞吐量,有利于内容中心网络整体性能的提升。Due to the universal cache and the ability to support multi-interface forwarding in content centric network,an interest packet may result in multiple data replies from multiple publishers or caches.However,due to the one-to-one correspondence between interest and data,late arrival data will be discarded,which will inevitably lead to redundant data and increase the likelihood of network congestion.Aiming at the above problems,this paper proposes a congestion control algorithm based on round-trip delay and network coding. First of all,the use of network coding which mixed information,shields the data differences from multiple sources,masks the data packet loss and out-of-order,achieves parallel encoding packet transmission and speeds up data retrieval. Secondly,based on the round trip delay that interest is satisfied in a certain period of time,the paper proposes an algorithm which adjusts congestion window based on the degree of network congestion. In order to verify the effectiveness of the proposed algorithm,this mechanism was simulated on ndn Sim,and the throughput index was compared. The results show that this mechanism can maintain high throughput when the network packet loss rate is high and the network condition is not good,which is beneficial to the overall performance of content centric network.

关 键 词：计算机网络 内容中心网络 网络编码 拥塞控制 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]