【摘要】：在信息化時(shí)代的今天,加強(qiáng)通信基礎(chǔ)設(shè)施建設(shè),對(duì)促進(jìn)全球經(jīng)濟(jì)發(fā)展、信息交流具有重大意義。衛(wèi)星通信系統(tǒng)以其覆蓋范圍廣,不受地理環(huán)境影響的特點(diǎn)成為不二選擇。衛(wèi)星通信系統(tǒng)目前面臨的主要困難包括星上資源有限、網(wǎng)絡(luò)配置不靈活、網(wǎng)絡(luò)功能迭代緩慢且代價(jià)昂貴等。軟件定義網(wǎng)絡(luò)(software defined network,SDN)技術(shù)提出的控制面與數(shù)據(jù)面分離的架構(gòu)思想,以及其數(shù)據(jù)面通用、簡單、高效的特點(diǎn),為衛(wèi)星通信網(wǎng)絡(luò)的建設(shè)提供了新的思路。為此,本文結(jié)合SDN思想,分別在衛(wèi)星組網(wǎng)架構(gòu)、衛(wèi)星網(wǎng)絡(luò)QoS路由與衛(wèi)星網(wǎng)絡(luò)大塊數(shù)據(jù)傳輸方面,進(jìn)行了一些嘗試。結(jié)合多層衛(wèi)星網(wǎng)絡(luò)的概念,本文首先研究覆蓋全球的衛(wèi)星星座系統(tǒng),提出分段控制軟件定義衛(wèi)星網(wǎng)絡(luò)(software definition satellite network based on segment control,SSDSN),將SDN架構(gòu)思想引入衛(wèi)星通信系統(tǒng)。由于SSDSN中星地鏈路帶寬的限制,同時(shí)為了減少存儲(chǔ)流表項(xiàng)對(duì)星上存儲(chǔ)資源帶來的壓力,本文引入了分段路由的概念,減少控制層控制信令的數(shù)目,將流的轉(zhuǎn)發(fā)信息更多的存儲(chǔ)到數(shù)據(jù)報(bào)文中。當(dāng)今網(wǎng)絡(luò)由最初的純粹傳送數(shù)據(jù)報(bào)文轉(zhuǎn)變?yōu)閭鬏斦Z音、視頻、數(shù)據(jù)等多種業(yè)務(wù),不同的業(yè)務(wù)具有不同的傳輸質(zhì)量要求。衛(wèi)星網(wǎng)絡(luò)由于其網(wǎng)絡(luò)拓?fù)鋭?dòng)態(tài)變化,鏈路特性時(shí)變等特點(diǎn),如何有效的分配網(wǎng)絡(luò)資源,最大程度的滿足更多業(yè)務(wù)的傳輸需求是目前的研究重點(diǎn)。在SSDSN,借助于SDN架構(gòu)帶來的更強(qiáng)的網(wǎng)絡(luò)控制和感知能力,針對(duì)上述問題,本文采用了基于分段路由的區(qū)分服務(wù)路由算法(differenciated service based on segment routing,DSSR),以期做到區(qū)分業(yè)務(wù)類型的QoS保障,并將用戶的接入切換和衛(wèi)星網(wǎng)絡(luò)路由統(tǒng)一起來。針對(duì)網(wǎng)絡(luò)中存在的對(duì)時(shí)延不敏感,但具有傳輸期限要求的大塊數(shù)據(jù)業(yè)務(wù),本文提出動(dòng)態(tài)帶寬分配傳輸算法,該算法在保證業(yè)務(wù)QoS需求的基礎(chǔ)上,不同快照拓?fù)鋸椥苑峙鋷?靈活調(diào)度衛(wèi)星鏈路帶寬資源,做到盡可能多的容納上述業(yè)務(wù)。最后,本文在OPNET仿真平臺(tái)上,驗(yàn)證上述架構(gòu)和算法,結(jié)果表明SSDSN架構(gòu)具有可行性;DSSR算法,區(qū)分對(duì)待了各類業(yè)務(wù),在滿足業(yè)務(wù)QoS要求的基礎(chǔ)上,做到了網(wǎng)絡(luò)資源的合理分配。動(dòng)態(tài)帶寬分配傳輸算法有效解決網(wǎng)絡(luò)中具有截止日期的數(shù)據(jù)業(yè)務(wù)的傳輸問題。
[Abstract]:In the information age, it is of great significance to strengthen the construction of communication infrastructure to promote the global economic development and information exchange. Satellite communication system has become a good choice because of its wide coverage and not affected by geographical environment. The main difficulties faced by satellite communication systems include limited on-board resources, inflexible network configuration, slow iteration of network functions and high cost. The idea of separating the control surface from the data surface proposed by the software definition network (software defined network,SDN) technology, and the general, simple and efficient characteristics of the data surface, provide a new way of thinking for the construction of satellite communication network. In this paper, combined with the idea of SDN, some attempts are made in satellite network architecture, satellite network QoS routing and satellite network bulk data transmission. Combined with the concept of multi-layer satellite network, this paper first studies the satellite constellation system covering the whole world, and proposes a piecewise control software to define the satellite network (software definition satellite network based on segment control,SSDSN), and introduces the idea of SDN architecture into the satellite communication system. Because of the limitation of the bandwidth of the satellite-ground link in SSDSN, and in order to reduce the pressure on the on-board storage resource caused by the storage flow table item, this paper introduces the concept of piecewise routing to reduce the number of control signaling in the control layer. The forwarding information of the stream is stored more in the data message. Nowadays, the network changes from the original pure data packet to the transmission of voice, video, data and other services, different services have different transmission quality requirements. Because of the dynamic change of network topology and time-varying link characteristics, how to allocate network resources effectively and meet the transmission requirements of more services is the focus of research. In SSDSN, with the help of SDN architecture, a new differentiated service routing algorithm (differenciated service based on segment routing,DSSR) is adopted in order to achieve the QoS guarantee of differentiated service type, so as to solve the above problems. In view of the above problems, this paper adopts the differentiated service routing algorithm (differenciated service based on segment routing,DSSR) based on piecewise routing. And the user's access switch and satellite network routing unified. In this paper, a dynamic bandwidth allocation transmission algorithm is proposed for the bulk data traffic which is not sensitive to delay and has the requirement of transmission time. This algorithm can allocate bandwidth flexibly in different snapshot topologies on the basis of guaranteeing the QoS requirements of traffic. Flexible scheduling of satellite link bandwidth resources to accommodate as many services as possible. Finally, this paper verifies the above architecture and algorithm on the OPNET simulation platform, the results show that the SSDSN architecture is feasible; the DSSR algorithm, which distinguishes all kinds of services, achieves the reasonable allocation of network resources on the basis of satisfying the requirements of QoS services. Dynamic bandwidth allocation (DBA) algorithm effectively solves the transmission problem of data services with cut-off date in the network.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TN927.2

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相關(guān)期刊論文 前1條

1 雷葆華;王峰;王儰;;SDN核心技術(shù)剖析和實(shí)戰(zhàn)指南[J];中國科技信息;2013年21期

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本文編號(hào)：2294391