内容中心网络的缓存优化问题研究

发布时间：2018-02-15 06:22

本文关键词： CCN 缓存利用冗余消除流量减少网络流缓存管理　出处：《电子科技大学》2014年硕士论文　论文类型：学位论文

【摘要】：当前以“IP地址为中心”的互联网络体系结构在移动性,扩展性,安全性,服务质量和经济性等方面都暴露出了先天的缺陷,为了解决这些问题,目前研究界的主流思路之一是建立“以内容为中心”的下一代互联网络(ICN:Information Centric Network)。内容中心网络(CCN:Content Centric Network)是目前研究界提出最具代表性的“以内容为中心”的下一代互联网络架构之一。路由器可以对转发的内容进行缓存是CCN提高内容分发效率的关键因素。在CCN网络的缓存问题研究中,缓存利用机制是指是利用缓存来减少网络流量,分为减少网络中传输报文的数量和减小网络中传输报文的大小两种方式。减少报文数量的方式对内容总量大,单个节点缓存较小的CCN网络的流量影响不大。现有研究表明互联网络中传输的数据包中包含大量的冗余消息,通过减少网络中传输的冗余消息可以大幅度提高网络的带宽利用效率。传统互联网络中为实现冗余消除,会带来大量的额外通信开销,很难在网络中实现。CCN网络特殊的通信方式和路由器的内容缓存能力为消除网络中传输的冗余消息提供了有力的支撑。本文提出了一种CCN中网络级的传输内容冗余消除方法,减少网络流量,提高带宽利用效率,在CCN中实现网络级的传输内容冗余消除。缓存管理方法是指节点需要对经过其的内容进行缓存决策使得缓存效率最高。缓存节点独立决策是否缓存某个内容,则网络中很多节点都可能缓存有该内容,这样过度的缓存造成了缓存资源的浪费,缓存利用效率不高。为了避免重复缓存,提高缓存利用效率,现在的缓存管理方法普遍采用协作式的缓存管理,而现有的以“逐个内容决策”和“集中式计算”为特征的协作式缓存管理方法存在通信开销大、处理开销大和扩展性差,不适应内容快速动态变化的场景等问题,因此并不适合内容数目大,缓存状态变化快的CCN网络。传统IP网络中基于流的方法可以提高报文的处理效率,可以解决现有协作式缓存管理不完全适用于CCN网络的问题。针对CCN网络的特点,本文提出一种CCN网络基于网络流的缓存管理方法,以较低的通信和处理开销,实现高效的缓存管理,进一步减少网络流量。
[Abstract]:The current "IP address centric" Internet architecture has exposed inherent defects in mobility, scalability, security, quality of service and economy. In order to solve these problems, One of the main ideas of the current research community is to establish a "content-centric" next-generation Internet network (ICN: information Centric Network), which is the most representative "content-centric" next-generation interaction proposed by the research community at present. One of the network architecture. Router can cache the forwarded content is the key factor for CCN to improve the efficiency of content distribution. Cache utilization mechanism refers to the use of cache to reduce network traffic, which is divided into two ways: reducing the number of packets transmitted in the network and reducing the size of the transmission packets in the network. The single node cache small CCN network has little impact on traffic. Existing research shows that the packets transmitted in the Internet contain a large number of redundant messages. By reducing the redundant messages transmitted in the network, the bandwidth utilization efficiency of the network can be greatly improved. In order to eliminate redundancy in the traditional Internet, it will bring a lot of additional communication overhead. It is very difficult to realize the special communication mode of. CCN network and the content cache ability of router in the network. It provides a powerful support for eliminating redundant messages transmitted in the network. In this paper, a method of eliminating redundancy of transmission content in network level in CCN is proposed. Reduce network traffic, improve bandwidth efficiency, The method of cache management is that the node needs to cache the content through which the cache efficiency is the highest. The cache node independently decides whether to cache a certain content or not. Many nodes in the network may cache this content, which results in a waste of cache resources and low efficiency of cache utilization. Nowadays, cooperative cache management is widely used in cache management methods. However, the existing cooperative cache management methods, which are characterized by "individual content decision" and "centralized computing", have large communication overhead, large processing overhead and poor expansibility. It is not suitable for CCN networks with large number of content and fast change of cache state, so it is not suitable for CCN networks with fast dynamic change of content, etc. In traditional IP networks, streaming based methods can improve the efficiency of packet processing. It can solve the problem that the existing cooperative cache management is not fully applicable to CCN network. According to the characteristics of CCN network, this paper proposes a cache management method based on network flow in CCN network, which has low communication and processing overhead. Implement efficient cache management and further reduce network traffic.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TP393.02

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