本文選題：信息中心網(wǎng)絡(luò) + 無線網(wǎng)絡(luò)　； 參考：《北京郵電大學(xué)》2017年博士論文

【摘要】：信息中心網(wǎng)絡(luò)(Information-Centric Networking,ICN)改變了現(xiàn)有IP (Internet Protocol,網(wǎng)際協(xié)議)網(wǎng)絡(luò)的格局,針對目前互聯(lián)網(wǎng)承載內(nèi)容的飛速發(fā)展、用戶訪問網(wǎng)絡(luò)的主要行為之一演變成對海量內(nèi)容的獲取這種現(xiàn)象,ICN以請求和獲取信息為基本行為模式,而非傳統(tǒng)的端到端連接,從而有效的進行內(nèi)容分發(fā)。秉承骨干網(wǎng)絡(luò)簡潔化、邊緣網(wǎng)絡(luò)智能化的原則,骨干網(wǎng)的設(shè)計采用分布式ICN網(wǎng)絡(luò),局域網(wǎng)的設(shè)計采用集中式網(wǎng)絡(luò)模式。其中,分布式ICN體系架構(gòu)參考了當(dāng)前IP網(wǎng)絡(luò)的沙漏模型,以內(nèi)容塊為細腰,取代傳統(tǒng)的IP細腰,既可以方便全球互聯(lián),又支持網(wǎng)絡(luò)層以外各個層次的繁榮發(fā)展。它包含2種數(shù)據(jù)分組:興趣分組(interest packet)和數(shù)據(jù)分組(data packet)。其路由器節(jié)點還具備三個數(shù)據(jù)結(jié)構(gòu):待定興趣表(pending interest table,PIT )、轉(zhuǎn)發(fā)信息表(forwarding information base, FIB )和內(nèi)容緩存庫(content store, CS)。該設(shè)計可以實現(xiàn)請求的聚合以及緩存的可重用。本文主要針對固網(wǎng)ICN緩存冗余、固網(wǎng)ICN緩存資源效用、如何將ICN緩存技術(shù)的優(yōu)勢應(yīng)用到無線網(wǎng)絡(luò)并解決其資源分配等問題展開研究,研究與實現(xiàn)ICN原型系統(tǒng)的開源代碼ccnx和仿真平臺NS-3。具體研究內(nèi)容和主要創(chuàng)新工作包括以下幾點:(1)提出了基于緩存狀態(tài)相關(guān)性的ICN緩存決定策略�？紤]到ICN緩存的目的是為了有效的減少流量冗余,然而在網(wǎng)絡(luò)中的不同位置緩存內(nèi)容會導(dǎo)致緩存冗余,因此放置內(nèi)容采用怎樣的緩存策略能夠優(yōu)化緩存資源的分配成為本文的一個研究重點。緩存策略包括緩存替換和緩存決定兩部分。本文從節(jié)點主動選擇是否緩存到達的數(shù)據(jù)包著手,通過分析路徑緩存能力、不同位置節(jié)點的替換頻率、節(jié)點間是否緩存內(nèi)容的相互影響等因素,提出了一種基于緩存狀態(tài)相關(guān)性的ICN緩存決定策略。通過以上幾個因素的綜合考慮,得到節(jié)點緩存數(shù)據(jù)包的概率,根據(jù)此概率來分配網(wǎng)絡(luò)中的緩存資源,從而有效的消除緩存冗余、提高網(wǎng)絡(luò)中的內(nèi)容多樣性、提高緩存節(jié)點的平均利用率、并極大地降低了內(nèi)容服務(wù)器的負載。優(yōu)化緩存資源分配的同時,還通過節(jié)點之間的協(xié)作保證路徑節(jié)點具有一定的緩存規(guī)律。(2)提出了基于內(nèi)容差異化的ICN緩存資源自動分配和管理機制。ICN最初的設(shè)想是利用網(wǎng)內(nèi)緩存資源來換取帶寬資源。然而現(xiàn)有研究中緩存的內(nèi)容是不加區(qū)分的,沒有考慮到差異化(用戶對不同類型內(nèi)容的請求率不同,如視頻類)的因素,并且實際部署當(dāng)中ICN的緩存大小有限。為了更好的滿足當(dāng)前海量內(nèi)容的需求且有效的利用有限的緩存資源,本文首先將ICN中的用戶流量按照一定的優(yōu)先級分成若干類,并利用層次分析法將這些類內(nèi)容定量的給出不同的緩存權(quán)重,進一步利用控制論的理論來建立節(jié)點自管控模型,基于上述的分類方法和管控模型,節(jié)點將為不同類的內(nèi)容分配不同大小的緩存空間,差異化的為不同類的內(nèi)容提供不同的服務(wù)質(zhì)量(如緩存命中,請求時延小等)。通過控制環(huán)路的每次調(diào)整,來實時改變不同類內(nèi)容的緩存空間,以期達到預(yù)設(shè)想要的性能。引入控制環(huán)路這一想法,不僅可以維持每個節(jié)點緩存空間的恒定,還能夠保證性能的穩(wěn)定性,使得網(wǎng)絡(luò)運營商可以幫助內(nèi)容運營商在骨干網(wǎng)中管理和控制每個緩存節(jié)點內(nèi)存儲的內(nèi)容,為內(nèi)容運營商提供不同級別的內(nèi)容/服務(wù)加速。(3)提出了融合ICN緩存資源的無線網(wǎng)絡(luò)架構(gòu)及資源分配模型。目前關(guān)于ICN緩存技術(shù)在無線網(wǎng)絡(luò)中的應(yīng)用、邊緣計算與無線網(wǎng)絡(luò)的結(jié)合、軟件定義網(wǎng)絡(luò)在無線網(wǎng)絡(luò)中的應(yīng)用等方面的研究日漸增加,然而對于用戶而言,通信、緩存、計算設(shè)備都是底層資源,用戶并不關(guān)注資源是如何布局,只關(guān)注用戶體驗�？紤]到不同種類的資源能夠為用戶解決不同的應(yīng)用需求,并且結(jié)合當(dāng)前無線網(wǎng)絡(luò)的不同異構(gòu)無線接入方式彼此之間存在互補的特性。本文為了給用戶提供更好的體驗并且完善多元化網(wǎng)絡(luò)的能力,除了傳統(tǒng)的通信能力,一方面增加ICN的通信設(shè)備緩存能力,另一方面增加邊緣通信設(shè)備計算能力。通過軟件定義的方式來管理和控制各式各樣的異構(gòu)無線模式,以及多樣性的底層資源,進而程控不同接入方式下的不同資源分配,既保證了用戶側(cè)的時效性,又達到的綠色節(jié)能的效果。進一步,在該融合了 ICN緩存資源的無線網(wǎng)絡(luò)架構(gòu)模型下,針對當(dāng)前的網(wǎng)絡(luò)情況和用戶需要的不同底層資源情況,為用戶選擇不同的接入方式,保證網(wǎng)絡(luò)資源分配均勻、節(jié)省能耗、用戶對應(yīng)用時效性等方面用戶體驗的需求。
[Abstract]:Information-Centric Networking (ICN) has changed the pattern of existing IP (Internet Protocol, Internet Protocol) network. In view of the rapid development of the content of the Internet, one of the main behaviors of the user's access to the network becomes the phenomenon of obtaining the mass content, and ICN is the basic behavior model for the request and acquisition of information. And not the traditional end to end connection, so as to effectively carry on the content distribution. Adhering to the principle of the backbone network succinct and the intelligent edge network, the design of backbone network adopts distributed ICN network, the design of the LAN adopts centralized network mode. The distributed ICN architecture refers to the hourglass model of the current IP network and the inner volume block. For fine waist, instead of the traditional IP waist, it can facilitate the global interconnection and support the prosperity and development of various levels outside the network layer. It contains 2 data groups: interest packet and data packet. The router node also has three data structures: the undetermined interest table (pending interest table, PIT), forwarding letter. Forwarding information base (FIB) and content cache Library (content store, CS). This design can achieve the aggregation of requests and the reusable caching. This paper mainly focuses on the caching redundancy of fixed network ICN, the utility of the fixed network ICN caching resource, how to apply the advantage of the ICN caching technology to the wireless network and solve the problem of resource allocation. The research, the research and implementation of the open source code ccnx and the simulation platform of the ICN prototype system, the specific research content and the main innovation work include the following points: (1) a ICN cache decision strategy based on caching state relevance is proposed. The purpose of the ICN cache is to effectively reduce traffic redundancy, however, in different locations in the network Caching content can lead to caching redundancy, so how to optimize the allocation of caching resources with what kind of caching strategy is used is a focus of this paper. Caching strategy includes two parts: cache replacement and caching decision. A ICN cache decision strategy based on caching state relevance is proposed for the substitution frequency of the same location nodes and the mutual influence of caching content among nodes. Through the comprehensive consideration of the above factors, the probability of the node caching packets is obtained, and the cache resources in the network are allocated according to this probability, thus effectively eliminating the caching resources in the network. Caching redundancy can improve the content diversity in the network, improve the average utilization of caching nodes, and greatly reduce the load of the content server. At the same time, the allocation of caching resources is optimized, and the path nodes are guaranteed to have certain caching rules through the collaboration between nodes. (2) an automatic ICN cache resource based on content differentiation is proposed. The initial idea of the allocation and management mechanism.ICN is to use the network cache resources to exchange bandwidth resources. However, the content of the existing research is not differentiated, and does not consider the difference (the user's request rate for different types of content, such as the video class), and the actual deployment of the ICN is limited in size. In order to meet the needs of the current mass content and effectively utilize the limited cache resources, this paper first divides the user traffic in ICN into several classes according to a certain priority, and uses the analytic hierarchy process to give the different caching weights of these contents quantificationally, and further uses the theory of control theory to establish the node self control model. In the above classification method and control model, nodes will allocate different sizes of cache space for different classes of content, and provide different quality of service for different classes of content (such as cache hit, request delay, etc.). By controlling each adjustment of the loop, the cache space of different classes of content can be changed to achieve the presupposition. The idea of introducing the control loop can not only maintain the constant cache space for each node, but also ensure the stability of the performance, so that the network operators can help the content operators manage and control the contents stored in each cache node in the backbone network, and provide different levels of content / service for the content operators. (3) (3) the wireless network architecture and resource allocation model are proposed. The application of ICN caching technology in wireless network, the combination of edge computing and wireless network, and the application of software defined network in wireless network are increasing. However, for users, communication, caching and computing are used. Devices are all underlying resources. Users do not pay attention to how resources are laid out and only focus on user experience. Considering different kinds of resources can solve different application requirements for users, and there are complementary characteristics to each other in the current wireless network with different heterogeneous wireless access methods. This article provides a better experience for users. And the ability to improve the diversity of the network, in addition to the traditional communication ability, on the one hand increase the ICN communication equipment caching capability, on the other hand increase the computing power of the edge communication equipment. Through the software definition to manage and control a variety of heterogeneous wireless modes, and the diversity of the underlying resources, and then program control different access parties. The distribution of different resources under the model not only ensures the efficiency of the user side, but also achieves the effect of green energy saving. Further, under the wireless network architecture model of the ICN caching resource, we can choose different access methods for users to ensure the distribution of network resources for the users according to the current network situation and the different underlying resource conditions required by the users. Uniform, saving energy consumption, user needs for user experience in timeliness and application.

【學(xué)位授予單位】：北京郵電大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2017
【分類號】：TP393.0

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本文編號：1828876