面向多自治域環(huán)境的ICN緩存策略與機(jī)制研究
發(fā)布時(shí)間：2018-08-19 06:27
【摘要】：近年來(lái),流媒體業(yè)務(wù)及多媒體內(nèi)容分享應(yīng)用出現(xiàn),而新應(yīng)用更關(guān)心內(nèi)容本身,對(duì)內(nèi)容存儲(chǔ)位置并不在意,當(dāng)前TCP/IP基于主機(jī)的通信模式難以適應(yīng)這一轉(zhuǎn)變,網(wǎng)絡(luò)流量呈現(xiàn)爆炸性增長(zhǎng)的趨勢(shì)。研究界提出的信息中心網(wǎng)絡(luò)(ICN,Information CentricNetworking)以信息為網(wǎng)絡(luò)主體,使用內(nèi)容名進(jìn)行數(shù)據(jù)標(biāo)識(shí)與路由,利用泛在的網(wǎng)絡(luò)內(nèi)置緩存和靈活的路由轉(zhuǎn)發(fā)引擎來(lái)滿足用戶請(qǐng)求。緩存是ICN網(wǎng)絡(luò)架構(gòu)的基石,其呈現(xiàn)的透明化、泛在化和細(xì)粒度等特性使之成為解決流量爆炸性增長(zhǎng)的主要手段,是ICN網(wǎng)絡(luò)的一大研究熱點(diǎn)。但是泛在緩存的線速響應(yīng)要求導(dǎo)致節(jié)點(diǎn)的緩存容量受限,因此選用合適的緩存策略對(duì)于合理利用緩存、提高數(shù)據(jù)獲取速度有重要意義。ICN網(wǎng)絡(luò)商業(yè)化進(jìn)程要求其適應(yīng)于多域環(huán)境,當(dāng)把ICN拓展到多個(gè)自治域時(shí),緩存成為網(wǎng)絡(luò)提供商進(jìn)行商業(yè)談判的籌碼,因此多域緩存策略的設(shè)計(jì)目標(biāo)轉(zhuǎn)變?yōu)榉嫌蜷g商業(yè)關(guān)系、有效部署網(wǎng)絡(luò)緩存、靈活設(shè)置策略和較好的用戶體驗(yàn),給緩存策略的研究提出新的挑戰(zhàn)。本文以ICN網(wǎng)絡(luò)的緩存機(jī)制作為切入點(diǎn),分別對(duì)ICN網(wǎng)絡(luò)單域環(huán)境和多域環(huán)境下的緩存策略進(jìn)行了研究。主要貢獻(xiàn)有以下三點(diǎn):第一,在對(duì)單域環(huán)境下緩存策略的分析和比較的基礎(chǔ)上,本文提出了基于節(jié)點(diǎn)角色劃分的混合型緩存策略。將域內(nèi)節(jié)點(diǎn)根據(jù)重要性進(jìn)行角色分配,核心節(jié)點(diǎn)采用基于HASH的顯式協(xié)同策略,邊緣節(jié)點(diǎn)采用LCE和LCD的隱式協(xié)同策略,從而在合理利用緩存空間的基礎(chǔ)上獲得較好的用戶體驗(yàn)。第二,當(dāng)前緩存策略的研究大多集中在單域,而ICN網(wǎng)絡(luò)商業(yè)化的推進(jìn)要求其必須適用于多域環(huán)境,并符合各網(wǎng)絡(luò)參與者之間的商業(yè)關(guān)系。本文提出符合域間商業(yè)關(guān)系的完備的ICN緩存策略,包括基于自治系統(tǒng)間關(guān)系(relation)、基于內(nèi)容提供商費(fèi)率(provider)及綜合考慮自治域關(guān)系和內(nèi)容提供商費(fèi)率(relvider)的緩存策略,各自治域可根據(jù)自身需求靈活選取不同緩存策略,同時(shí)各緩存策略又細(xì)分為域間緩存決策、域內(nèi)緩存決策、域內(nèi)緩存替換,并設(shè)計(jì)了與緩存策略相匹配的請(qǐng)求轉(zhuǎn)發(fā)策略和通告策略,以滿足多域環(huán)境下的商業(yè)關(guān)系和用戶需求,并達(dá)到合理利用緩存、獲得較好網(wǎng)絡(luò)性能的目標(biāo)。第三,本文擴(kuò)展與改進(jìn)了 ICN中具有代表性的CCN網(wǎng)絡(luò)架構(gòu),對(duì)ccnSim仿真框架進(jìn)行修改,實(shí)現(xiàn)了基于節(jié)點(diǎn)角色劃分的混合型緩存策略和符合域間商業(yè)關(guān)系的多域緩存策略,并通過(guò)仿真實(shí)驗(yàn)將所提策略與對(duì)比策略進(jìn)行比較,驗(yàn)證了策略有效性并進(jìn)行了性能比較。
[Abstract]:In recent years, streaming media services and multimedia content sharing applications have emerged, but the new applications are more concerned about the content itself and do not care about the location of content storage. The current TCP/IP host-based communication mode is difficult to adapt to this change. Network traffic shows an explosive growth trend. The information center CentricNetworking proposed by the research community uses information as the main body of the network, uses the content name for data identification and routing, and makes use of the ubiquitous network built-in cache and the flexible routing forwarding engine to satisfy the user's request. Cache is the cornerstone of ICN network architecture, and its features such as transparency, ubiquity and fine granularity make it the main method to solve the explosive growth of traffic, and it is a research hotspot of ICN network. However, due to the requirement of line speed response of ubiquitous cache, the cache capacity of nodes is limited. Therefore, it is important to select appropriate cache strategies for reasonably utilizing cache and improving the speed of data acquisition. The commercialization process of ICN network requires it to be adapted to multi-domain environment. When ICN is extended to multiple autonomous domains, cache becomes a bargaining chip for network providers to negotiate business. Therefore, the design goal of multi-domain cache policy is changed to conform to inter-domain business relationship, and to deploy network cache effectively. Flexible setting strategy and better user experience present a new challenge to the research of cache policy. In this paper, the cache mechanism of ICN network is taken as the breakthrough point, and the cache strategies in single domain environment and multi domain environment of ICN network are studied respectively. The main contributions are as follows: first, based on the analysis and comparison of cache policies in single domain environment, this paper proposes a hybrid caching strategy based on the partitioning of node roles. The core node adopts explicit cooperative strategy based on HASH and the edge node adopts implicit cooperative strategy of LCE and LCD so as to obtain a better user experience on the basis of reasonable use of cache space. Secondly, most of the current research on cache strategy is focused on single domain, and the commercialization of ICN network requires that it be applicable to multi-domain environment and conform to the business relationship among network participants. This paper proposes a complete ICN caching strategy that conforms to the inter-domain commercial relationship, including the caching strategy based on the content provider rate (provider) based on the autonomous system relationship (relation), and the integrated consideration of the autonomous domain relationship and the content provider rate (relvider). Each local domain can flexibly select different cache strategies according to its own requirements. At the same time, each cache policy can be subdivided into inter-domain cache decisions and intra-domain cache replacement. A request forwarding policy and a notification policy matching the cache policy are designed to meet the business relationship and user needs in multi-domain environment and to achieve the goal of reasonably utilizing cache and obtaining better network performance. Thirdly, this paper extends and improves the representative CCN network architecture in ICN, modifies the ccnSim simulation framework, implements a hybrid caching strategy based on node role partitioning and a multi-domain caching strategy that conforms to the business relationship between domains. The simulation results show that the proposed strategy is effective and the performance is compared.
【學(xué)位授予單位】：南京師范大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TP393.0
本文編號(hào)：2190932
[Abstract]:In recent years, streaming media services and multimedia content sharing applications have emerged, but the new applications are more concerned about the content itself and do not care about the location of content storage. The current TCP/IP host-based communication mode is difficult to adapt to this change. Network traffic shows an explosive growth trend. The information center CentricNetworking proposed by the research community uses information as the main body of the network, uses the content name for data identification and routing, and makes use of the ubiquitous network built-in cache and the flexible routing forwarding engine to satisfy the user's request. Cache is the cornerstone of ICN network architecture, and its features such as transparency, ubiquity and fine granularity make it the main method to solve the explosive growth of traffic, and it is a research hotspot of ICN network. However, due to the requirement of line speed response of ubiquitous cache, the cache capacity of nodes is limited. Therefore, it is important to select appropriate cache strategies for reasonably utilizing cache and improving the speed of data acquisition. The commercialization process of ICN network requires it to be adapted to multi-domain environment. When ICN is extended to multiple autonomous domains, cache becomes a bargaining chip for network providers to negotiate business. Therefore, the design goal of multi-domain cache policy is changed to conform to inter-domain business relationship, and to deploy network cache effectively. Flexible setting strategy and better user experience present a new challenge to the research of cache policy. In this paper, the cache mechanism of ICN network is taken as the breakthrough point, and the cache strategies in single domain environment and multi domain environment of ICN network are studied respectively. The main contributions are as follows: first, based on the analysis and comparison of cache policies in single domain environment, this paper proposes a hybrid caching strategy based on the partitioning of node roles. The core node adopts explicit cooperative strategy based on HASH and the edge node adopts implicit cooperative strategy of LCE and LCD so as to obtain a better user experience on the basis of reasonable use of cache space. Secondly, most of the current research on cache strategy is focused on single domain, and the commercialization of ICN network requires that it be applicable to multi-domain environment and conform to the business relationship among network participants. This paper proposes a complete ICN caching strategy that conforms to the inter-domain commercial relationship, including the caching strategy based on the content provider rate (provider) based on the autonomous system relationship (relation), and the integrated consideration of the autonomous domain relationship and the content provider rate (relvider). Each local domain can flexibly select different cache strategies according to its own requirements. At the same time, each cache policy can be subdivided into inter-domain cache decisions and intra-domain cache replacement. A request forwarding policy and a notification policy matching the cache policy are designed to meet the business relationship and user needs in multi-domain environment and to achieve the goal of reasonably utilizing cache and obtaining better network performance. Thirdly, this paper extends and improves the representative CCN network architecture in ICN, modifies the ccnSim simulation framework, implements a hybrid caching strategy based on node role partitioning and a multi-domain caching strategy that conforms to the business relationship between domains. The simulation results show that the proposed strategy is effective and the performance is compared.
【學(xué)位授予單位】：南京師范大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TP393.0
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