命名数据网络多态路由承载的内容分发模型

摘要

In order to solve the problem of ensuring the needs of diversified services in Named Data Networking (NDN),Content Delivery Model based on Polymorphic Routing (CDMPR) was proposed.In this model,four types of reconfigurable modular combination,namely content request,routing,table lookup,and content cache,were used to carry the service transmission with different characteristic requirements.The polymorphic routing algorithm examples for real-time traffic,nonreal-time streaming media services and user generated services were designed in detail,including improved ant colony optimization routing algorithm,the routing strategy of tracking and the shortcut routing mechanism based on oriented copy announcement.Simulation results show that compared with Diverse Content Delivery Scheme based on traffic types (DCDS) algorithm,CDMPR improves the average cache hit rate of network nodes by 4.45％-13.8％;compared with Content-Centric Networking (CCN) algorithm,the average response latencies of three types of services are reduced by 29.17％-53.02％,respectively.CDMPR realizes the support for difference service requirements.%针对命名数据网络(NDN)难以保障多样化业务服务需求问题,提出了多态路由承载的内容分发模型(CDMPR).该模型通过内容请求、路由计算、内容查表和内容缓存四种类型的重构模块组合来承载不同特征需求的业务传输,详细设计了面向实时业务、非实时流媒体业务和用户自产生业务的多态路由算法,分别为改进蚁群优化路由算法、循迹路由策略和基于导向性副本通告的捷径路由机制.仿真结果表明,相比基于业务类型的多样化内容分发机制(DCDS)算法,CDMPR将网络节点平均缓存命中率提高了4.45％ ～13.8％;相比内容中心网络(CCN)算法,三种业务的平均响应时延分别缩短了29.17％ ～53.02％.CDMPR实现了对多样化业务差异化服务需求的支持.