本文選題：緩存準(zhǔn)入策略 + 緩存一致性　； 參考：《北京交通大學(xué)》2017年博士論文

【摘要】：作為全球最大的信息共享平臺,互聯(lián)網(wǎng)在促進(jìn)科技發(fā)展、經(jīng)濟(jì)騰飛、民生提升等諸多方面發(fā)揮著不可替代的作用。然而,現(xiàn)有互聯(lián)網(wǎng)因其原始設(shè)計(jì)缺陷已難以滿足當(dāng)今用戶和運(yùn)營商的多元化需求,在異構(gòu)網(wǎng)絡(luò)融合、資源利用率等諸多方面暴露出難以解決的弊端,嚴(yán)重阻礙其可持續(xù)發(fā)展。為此,設(shè)計(jì)全新的未來網(wǎng)絡(luò)體系架構(gòu)已成為世界各國最為重視的研究領(lǐng)域之一。然而,該領(lǐng)域的發(fā)展尚處起步階段,相關(guān)機(jī)制、技術(shù)細(xì)節(jié)仍需進(jìn)一步探索和完善。智慧協(xié)同網(wǎng)絡(luò)、一體化標(biāo)識網(wǎng)絡(luò)作為新型網(wǎng)絡(luò)體系架構(gòu),旨在提升網(wǎng)絡(luò)的開放性、靈活性、可管可控性、運(yùn)行效率等,具有良好的發(fā)展前景。本文在全面調(diào)研國內(nèi)外相關(guān)領(lǐng)域研究現(xiàn)狀的基礎(chǔ)上,依托“智慧協(xié)同網(wǎng)絡(luò)”、“一體化標(biāo)識網(wǎng)絡(luò)”(以下簡稱“智慧協(xié)同一體化網(wǎng)絡(luò)”)總體設(shè)計(jì)思想,就體系架構(gòu)細(xì)化拓展、服務(wù)適配機(jī)制設(shè)計(jì)兩大關(guān)鍵問題開展深入研究,主要工作和創(chuàng)新點(diǎn)包括如下4個(gè)方面:(1)針對現(xiàn)有互聯(lián)網(wǎng)所存在的異構(gòu)網(wǎng)絡(luò)融合差、移動(dòng)性支持不足、傳輸效率低等問題,提出了智慧協(xié)同一體化網(wǎng)絡(luò)下的一種異構(gòu)網(wǎng)絡(luò)高效互聯(lián)的組網(wǎng)方案,該方案重新設(shè)計(jì)了網(wǎng)絡(luò)的命名空間、結(jié)構(gòu)組成、實(shí)體功能、注冊更新和傳輸機(jī)制,以解決上述互聯(lián)網(wǎng)弊端。為驗(yàn)證其可行性,搭建相關(guān)原型系統(tǒng)并進(jìn)行測試。測試結(jié)果表明,所提組網(wǎng)方案可滿足異構(gòu)網(wǎng)絡(luò)融合的設(shè)計(jì)需求,并在移動(dòng)性、流量遷移、傳輸效率等方面較之現(xiàn)有互聯(lián)網(wǎng)架構(gòu)存在明顯優(yōu)勢。例如,該組網(wǎng)方案實(shí)現(xiàn)了網(wǎng)絡(luò)層面的天地網(wǎng)絡(luò)有效互聯(lián),終端移動(dòng)切換時(shí)延從秒級降為毫秒級。(2)針對服務(wù)內(nèi)容適配問題,提出了兩種復(fù)雜度為O(1)的路由器緩存準(zhǔn)入策略,實(shí)現(xiàn)路由器對服務(wù)內(nèi)容的流行度感知與按需存儲,提升用戶體驗(yàn)及適配效益。通過大量仿真評估了所提路由器準(zhǔn)入策略的性能。此外,在仿真中還實(shí)現(xiàn)了其它7種常用復(fù)雜度為O(1)的準(zhǔn)入策略用于對比。結(jié)果表明,所提兩種緩存準(zhǔn)入策略在所測性能指標(biāo)中表現(xiàn)良好。例如,較之內(nèi)容為中心網(wǎng)絡(luò)所使用的默認(rèn)準(zhǔn)入策略LCE,所提兩種緩存準(zhǔn)入策略在用戶服務(wù)內(nèi)容平均獲取距離上降低17%以上。(3)為進(jìn)一步完善服務(wù)內(nèi)容適配機(jī)制,提出了緩存路由器一致性問題解決方案,盡量避免路由器緩存過期的流行服務(wù)內(nèi)容,實(shí)現(xiàn)一致性檢查強(qiáng)度與其對應(yīng)開銷的平衡。此外,還將網(wǎng)頁緩存系統(tǒng)中所使用的緩存一致性方案PET和TTL進(jìn)行優(yōu)化提升,以適應(yīng)緩存路由器網(wǎng)絡(luò)的新特點(diǎn)。為了驗(yàn)證所提方案的性能,首先,通過數(shù)學(xué)模型對所提三種方案進(jìn)行初步的開銷評估,其次,通過大量仿真對這些方案做進(jìn)一步的測試和探究。測試結(jié)果顯示,較之改進(jìn)后的PET,所提方案在用戶服務(wù)內(nèi)容平均獲取距離上顯著降低,較之改進(jìn)后的TTL,所提方案在用戶獲取服務(wù)內(nèi)容過期率上大幅下降。(4)針對服務(wù)功能適配問題,提出了服務(wù)功能為導(dǎo)向的通信基礎(chǔ)框架,為智慧協(xié)同一體化網(wǎng)絡(luò)服務(wù)功能按需適配提供體系支撐。其次,提出以節(jié)能為目標(biāo)的虛擬服務(wù)功能鏈映射優(yōu)化模型以及相應(yīng)啟發(fā)式算法,以提升服務(wù)功能適配效益。通過相關(guān)原型系統(tǒng)驗(yàn)證所提框架的可行性和有效性,通過大量仿真驗(yàn)證所提優(yōu)化模型和算法在網(wǎng)絡(luò)開啟虛擬機(jī)數(shù)量、剩余資源等節(jié)能上的優(yōu)勢。通過上述研究,進(jìn)一步充實(shí)、完善智慧協(xié)同一體化網(wǎng)絡(luò)架構(gòu)和相關(guān)機(jī)制,為新型網(wǎng)絡(luò)體系及關(guān)鍵技術(shù)的探索提供一種新思路。
[Abstract]:As the largest information sharing platform in the world, the Internet plays an irreplaceable role in promoting the development of science and technology, the economic take-off and the promotion of the people's livelihood. However, the existing Internet is difficult to meet the diversified needs of today's users and operators because of its original design defects, and the integration of heterogeneous networks, resource utilization and so on. Therefore, the design of a new network architecture has become one of the most important fields of research all over the world. However, the development of this field is still in the initial stage, and the related mechanisms and technical details need to be further explored and perfected. As a new network architecture, network is designed to improve the openness, flexibility, controllability and operation efficiency of the network, and it has a good development prospect. Based on the comprehensive investigation of the research status in the related fields at home and abroad, this paper relies on the "intelligent cooperative network" and "integrated identification network" (hereinafter referred to as "intelligent synergy". The main work and innovation points include the following 4 aspects: (1) aiming at the problems of heterogeneous network convergence, lack of mobility support, low transmission efficiency and so on, the wisdom synergy is put forward. An efficient interconnection network scheme for heterogeneous networks. The scheme redesigns the namespace, structure, entity function, registration update and transmission mechanism to solve the disadvantages of the Internet. In order to verify its feasibility, a related prototype system is built and tested. The test results show that the proposed network scheme is available. It meets the design requirements of heterogeneous network fusion, and has obvious advantages over the existing Internet architecture in terms of mobility, traffic migration and transmission efficiency. For example, the network scheme realizes the effective interconnection of the network layer network, and the terminal mobile handoff delay is reduced from second level to millisecond level. (2) the problem of service content adaptation is proposed. Two kinds of router caching admittance strategy with complexity of O (1) are used to realize the popularity awareness and on-demand storage of the service content, improve the user experience and benefit. The performance of the admittance strategy of the routers is evaluated through a lot of simulation. In addition, the other 7 other admittance strategies with O (1) complexity are also implemented in the simulation. The results show that the proposed two cache admittance strategies perform well in the measured performance indicators. For example, the default access strategy LCE used in the central network is compared with that of the two caching access strategies, and the two caching access strategies are reduced by more than 17% on the average access distance of the user service content. (3) it is proposed to further improve the service content adaptation mechanism. Cache router conformance problem solution, avoid the popular service content of router cache expired as far as possible, realize the balance of consistency check intensity and its corresponding overhead. In addition, the cache consistency scheme PET and TTL used in the web caching system are optimized to adapt to the new characteristics of caching router network. To verify the performance of the proposed scheme, first of all, through the mathematical model for the initial cost assessment of the three schemes, secondly, through a large number of simulations to further test and explore these schemes. The results show that compared with the improved PET, the proposed scheme decreases significantly in the average access distance of the user service content, and is better than that of the improved scheme. TTL, the proposed scheme has greatly reduced the content of user access to service content. (4) in view of the service function adaptation problem, a service function oriented communication infrastructure is proposed to provide system support for the integration of intelligent cooperative network service function according to demand. Secondly, a virtual service function chain mapping optimization model with energy saving as the target is proposed. Type and corresponding heuristic algorithm to improve the efficiency of service function, verify the feasibility and effectiveness of the proposed framework through the related prototype system, and through a large number of simulation and validation of the optimization model and algorithm in the network to open the number of virtual machines, the surplus resources and other advantages. Through the above research, further enrich, perfect the wisdom Association. The integrated network architecture and related mechanisms provide a new idea for the exploration of new network systems and key technologies.

【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2017
【分類號】：TP393.09

【參考文獻(xiàn)】

相關(guān)期刊論文 前1條

1 馮博昊;周華春;張宏科;張明川;;智慧協(xié)同網(wǎng)絡(luò)服務(wù)內(nèi)容在傳輸路徑上的緩存分配策略[J];通信學(xué)報(bào);2016年03期

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本文編號：1886209