本文關鍵詞：未來網(wǎng)絡信息分發(fā)技術研究　出處：《北京郵電大學》2015年碩士論文　論文類型：學位論文

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【摘要】：隨著人們越來越依賴互聯(lián)網(wǎng)來獲取信息,互聯(lián)網(wǎng)所承受的壓力也越來越大。從用戶的角度來看,網(wǎng)絡數(shù)據(jù)的訪問存在著時間和空間上的相關性,當某區(qū)域內(nèi)有用戶訪問過一個內(nèi)容后,該區(qū)域的其他用戶很可能再次訪問該內(nèi)容,如果每次都從原始數(shù)據(jù)源獲取內(nèi)容,會造成同一內(nèi)容地重復傳輸,浪費網(wǎng)絡帶寬,同時對源服務器也是很大的壓力。網(wǎng)絡緩存技術的出現(xiàn)在一定程度上緩解了上述問題。隨著人們對網(wǎng)絡的使用從基于主機位置(IP地址)向基于內(nèi)容的逐漸轉變,網(wǎng)絡中緩存的重要性越來越明顯。以內(nèi)容為中心的新型未來網(wǎng)絡架構應運而生。未來網(wǎng)絡以信息的分發(fā)和獲取為主要目的,信息內(nèi)容分發(fā)技術是未來網(wǎng)絡研究領域的一個核心問題。因此本論文重點研究了未來網(wǎng)絡中的信息分發(fā)技術。 近年來,未來網(wǎng)絡領域的研究已經(jīng)有很多,在數(shù)據(jù)分發(fā)技術方面的研究主要集中在網(wǎng)絡內(nèi)緩存相關的問題,未來網(wǎng)絡特別是信息中心網(wǎng)絡(Information-Centric Networking, ICN)中的緩存具有普遍存在、透明和細粒度的特點,在未來網(wǎng)絡中構成了一個網(wǎng)絡內(nèi)置緩存網(wǎng)絡,對于數(shù)據(jù)分發(fā)的性能有很大的影響,這方面研究的熱點包括網(wǎng)絡中各個結點緩存大小的設置、內(nèi)容在哪些結點緩存的緩存決策策略、緩存滿時更新哪些內(nèi)容的緩存替換策略以及結點間的協(xié)作緩存策略等。但是現(xiàn)在的研究大多還局限在有線場景和靜態(tài)拓撲的情況下,對于移動場景特別是車載網(wǎng)這種快速移動的動態(tài)拓撲場景下的緩存技術的研究還很少。 本文針對未來網(wǎng)絡特別是ICN在移動場景下的內(nèi)容分發(fā)問題,設計了一種基于社會關系的協(xié)作緩存機制。該協(xié)作緩存機制能夠提高移動網(wǎng)絡中結點間的鏈路穩(wěn)定性,保證數(shù)據(jù)分發(fā)的質(zhì)量,同時擴大內(nèi)容發(fā)現(xiàn)的范圍和效率,提高結點稀疏環(huán)境下的內(nèi)容分發(fā)效率,進而提高資源利用率,改善用戶體驗。本論文基于ndnSIM搭建仿真平臺,針對車載網(wǎng)高速移動結點場景對仿真環(huán)境中的模塊進行了更改,使之更加符合高速移動場景下的需要,然后將ICN中的普遍緩存策略和本論文提出的協(xié)作緩存機制進行了仿真對比,證明了協(xié)作緩存機制在未來網(wǎng)絡數(shù)據(jù)分發(fā)過程中的有效性和優(yōu)越性。最后,基于對全文總結的基礎上,指出了本文工作的不足和可以改進的地方。
[Abstract]:As people rely more and more on the Internet to obtain information, the pressure on the Internet is also increasing. From the perspective of users, the access of network data has time and space relevance. When a user in a region has access to a content, other users in that area are likely to access the content again, and if the content is retrieved from the original data source each time, the same content will be transferred repeatedly. Wasting network bandwidth. At the same time, there is also a lot of pressure on the source server. The emergence of network caching technology alleviates the above problem to some extent. As people use the network from host location to IP address). A gradual shift to content-based. The importance of cache in the network is becoming more and more obvious. A new content-centered future network architecture emerges as the times require. The main purpose of the future network is to distribute and obtain information. The information content distribution technology is a core problem in the future network research, so this paper focuses on the information distribution technology in the future network. In recent years, there are a lot of research in the field of network in the future. The research on data distribution technology is mainly focused on the issues related to cache in the network. Caching in future networks, especially information center networks, is ubiquitous in Information-Centric networking (ICNs). The characteristics of transparency and fine granularity constitute a network with built-in cache network in the future, which has a great impact on the performance of data distribution. The research focus in this area includes the setting of the cache size of each node in the network and the cache decision strategy of which nodes are cached. Cache replacement policy and cooperative cache policy among nodes are updated when cache is full. However, most of the current researches are limited to wired scenarios and static topology. There is little research on cache technology in mobile scene, especially in vehicle network, which is a fast moving dynamic topology scenario. This paper aims at the content distribution of future networks, especially ICN in mobile scenarios. A cooperative caching mechanism based on social relations is designed, which can improve the link stability between nodes in mobile network, ensure the quality of data distribution, and expand the scope and efficiency of content discovery. This paper builds a simulation platform based on ndnSIM to improve the efficiency of content distribution, resource utilization and user experience. The module in the simulation environment is changed for the high-speed mobile node scene of the vehicle network to make it more suitable for the needs of the high-speed mobile scene. Then the general cache strategy in ICN and the cooperative cache mechanism proposed in this paper are simulated and compared, which proves the effectiveness and superiority of the cooperative cache mechanism in the future network data distribution process. Finally. Based on the summary of the paper, this paper points out the shortcomings of the work and the possible improvement.
【學位授予單位】：北京郵電大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TP393.02

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本文編號：1355919