信息中心网络缓存机制研究及系统实现

发布时间：2018-02-21 11:44

本文关键词： 信息中心网络网内缓存域内协作内容分级缓存 ICN部署　出处：《清华大学》2014年硕士论文　论文类型：学位论文

【摘要】：互联网中内容的快速增长以及大量面向内容的应用的出现，使得现有互联网端对端的通信模式已难以适应大规模数据分发的要求。为此，，信息中心网络(ICN)，一种全新的clean-slate的网络体系结构被提出。ICN采用以内容为中心的端到网络的通信模式，内容被单独命名，路由器根据内容名字进行路由和转发，路由器可以对内容进行缓存以便再次被访问，这种缓存叫做网内缓存。网内缓存是ICN中非常重要的问题，缓存策略的好坏直接影响着网络的传输性能。目前提出的一些缓存方案由于从单个路由器的角度出发，缓存冗余大，影响缓存性能。本文首先对信息中心网络及网内缓存的研究进行了综述，在此基础上，基于域内访问与域外访问性能的差别，从一个域的角度出发，将一个域看成一个大的缓存池，从而提出了域内协作内容分级的ICN缓存策略IDCC。IDCC通过基于入口流速的初始缓存概率来降低缓存冗余和缓存替换率，通过域内通告和路由来提高缓存利用率，通过域内协作来降低缓存冗余，并且通过基于年龄的缓存替换机制来保证流行内容在缓存中存足够长的时间。实验表明，相比于典型的缓存方案CE和proCache，IDCC在引入较小的额外流量的情况下，能够较大的提高缓存性能。针对ICN与现有网络的兼容性问题以及部署的问题，本文还设计和实现了能在现有网络中部署的SIONA内容分发系统，并对其可行性和正确性进行了实验。结果表明，SIONA路由器能与现有网络兼容，并实现基于内容的缓存和路由，提高了网络传输性能。
[Abstract]:The rapid growth of content in the Internet and the emergence of a large number of content-oriented applications make the existing end-to-end communication mode of the Internet difficult to meet the requirements of large-scale data distribution. ICN, a new network architecture of clean-slate, is proposed to use the content-centric end-to-network communication mode. The content is named separately, and the router routes and forwards it according to the content name. Routers can cache content to be accessed again, a cache called an intranet cache. Intra-network cache is a very important problem in ICN, and the quality of cache policy directly affects the transmission performance of the network. Some cache schemes proposed at present have large cache redundancy from the point of view of a single router. First of all, this paper summarizes the research of information center network and intra-network cache, and based on this, based on the difference between intra-domain access and extra-domain access performance, from the point of view of one domain, Considering a domain as a large cache pool, this paper proposes a ICN cache policy based on cooperative content hierarchy in the domain. IDCC.IDCC reduces cache redundancy and cache replacement rate by using the initial cache probability based on inlet velocity. Cache utilization is improved by intra-domain notification and routing, cache redundancy is reduced by intra-domain collaboration, and age-based cache replacement mechanisms are used to ensure that popular content is kept in the cache for long enough time. Compared with the typical cache schemes CE and proCachen IDCC can greatly improve the cache performance in the case of small additional traffic. Aiming at the compatibility problem between ICN and existing network and the problem of deployment, this paper also designs and implements a SIONA content distribution system which can be deployed in the existing network. The feasibility and correctness of the router are tested, and the results show that the Sona router is compatible with the existing network, and implements content-based caching and routing, and improves the network transmission performance.
【学位授予单位】：清华大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TP393.02;TP333

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