本文關(guān)鍵詞： CCN 緩存利用 冗余消除 流量減少 網(wǎng)絡(luò)流 緩存管理　出處：《電子科技大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：當前以“IP地址為中心”的互聯(lián)網(wǎng)絡(luò)體系結(jié)構(gòu)在移動性,擴展性,安全性,服務(wù)質(zhì)量和經(jīng)濟性等方面都暴露出了先天的缺陷,為了解決這些問題,目前研究界的主流思路之一是建立“以內(nèi)容為中心”的下一代互聯(lián)網(wǎng)絡(luò)(ICN:Information Centric Network)。內(nèi)容中心網(wǎng)絡(luò)(CCN:Content Centric Network)是目前研究界提出最具代表性的“以內(nèi)容為中心”的下一代互聯(lián)網(wǎng)絡(luò)架構(gòu)之一。路由器可以對轉(zhuǎn)發(fā)的內(nèi)容進行緩存是CCN提高內(nèi)容分發(fā)效率的關(guān)鍵因素。在CCN網(wǎng)絡(luò)的緩存問題研究中,緩存利用機制是指是利用緩存來減少網(wǎng)絡(luò)流量,分為減少網(wǎng)絡(luò)中傳輸報文的數(shù)量和減小網(wǎng)絡(luò)中傳輸報文的大小兩種方式。減少報文數(shù)量的方式對內(nèi)容總量大,單個節(jié)點緩存較小的CCN網(wǎng)絡(luò)的流量影響不大�，F(xiàn)有研究表明互聯(lián)網(wǎng)絡(luò)中傳輸?shù)臄?shù)據(jù)包中包含大量的冗余消息,通過減少網(wǎng)絡(luò)中傳輸?shù)娜哂嘞⒖梢源蠓忍岣呔W(wǎng)絡(luò)的帶寬利用效率。傳統(tǒng)互聯(lián)網(wǎng)絡(luò)中為實現(xiàn)冗余消除,會帶來大量的額外通信開銷,很難在網(wǎng)絡(luò)中實現(xiàn)。CCN網(wǎng)絡(luò)特殊的通信方式和路由器的內(nèi)容緩存能力為消除網(wǎng)絡(luò)中傳輸?shù)娜哂嘞⑻峁┝擞辛Φ闹�。本文提出了一種CCN中網(wǎng)絡(luò)級的傳輸內(nèi)容冗余消除方法,減少網(wǎng)絡(luò)流量,提高帶寬利用效率,在CCN中實現(xiàn)網(wǎng)絡(luò)級的傳輸內(nèi)容冗余消除。緩存管理方法是指節(jié)點需要對經(jīng)過其的內(nèi)容進行緩存決策使得緩存效率最高。緩存節(jié)點獨立決策是否緩存某個內(nèi)容,則網(wǎng)絡(luò)中很多節(jié)點都可能緩存有該內(nèi)容,這樣過度的緩存造成了緩存資源的浪費,緩存利用效率不高。為了避免重復(fù)緩存,提高緩存利用效率,現(xiàn)在的緩存管理方法普遍采用協(xié)作式的緩存管理,而現(xiàn)有的以“逐個內(nèi)容決策”和“集中式計算”為特征的協(xié)作式緩存管理方法存在通信開銷大、處理開銷大和擴展性差,不適應(yīng)內(nèi)容快速動態(tài)變化的場景等問題,因此并不適合內(nèi)容數(shù)目大,緩存狀態(tài)變化快的CCN網(wǎng)絡(luò)。傳統(tǒng)IP網(wǎng)絡(luò)中基于流的方法可以提高報文的處理效率,可以解決現(xiàn)有協(xié)作式緩存管理不完全適用于CCN網(wǎng)絡(luò)的問題。針對CCN網(wǎng)絡(luò)的特點,本文提出一種CCN網(wǎng)絡(luò)基于網(wǎng)絡(luò)流的緩存管理方法,以較低的通信和處理開銷,實現(xiàn)高效的緩存管理,進一步減少網(wǎng)絡(luò)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.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TP393.02

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