本文關(guān)鍵詞：基于網(wǎng)絡(luò)編碼的光組播網(wǎng)絡(luò)的動(dòng)態(tài)資源分配研究　出處：《北京郵電大學(xué)》2014年博士論文　論文類型：學(xué)位論文

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【摘要】：隨著寬帶網(wǎng)絡(luò)的飛速發(fā)展,面對(duì)新型組播通信業(yè)務(wù)在整個(gè)數(shù)據(jù)業(yè)務(wù)中所占比重的不斷提高,以及用戶對(duì)高品質(zhì)組播質(zhì)量的追求,導(dǎo)致對(duì)網(wǎng)絡(luò)帶寬的要求越來(lái)越高,這對(duì)傳統(tǒng)電域IP組播傳輸能力提出了巨大挑戰(zhàn)。全光組播技術(shù)克服了光電光轉(zhuǎn)換對(duì)傳輸速率的限制,成為傳輸高帶寬和高速率組播業(yè)務(wù)的重要支撐技術(shù),同時(shí)將網(wǎng)絡(luò)編碼技術(shù)引入到全光組播網(wǎng)絡(luò)中,能夠進(jìn)一步提高光組播網(wǎng)絡(luò)的傳輸效率、容量和健壯性,為高帶寬組播問題研究提供一種有效的解決方法。 與此同時(shí),伴隨著用戶個(gè)性化,多樣化的組播服務(wù)需求,不僅要求網(wǎng)絡(luò)具有支持大容量、高速傳輸?shù)哪芰?而且能夠高效、可靠、靈活的傳送可變速率的多粒度業(yè)務(wù)。如何面向網(wǎng)絡(luò)編碼為不同粒度的組播業(yè)務(wù)高效靈活地分配光層資源成為當(dāng)前需要進(jìn)一步研究的內(nèi)容。 為了實(shí)現(xiàn)多粒度組播業(yè)務(wù)的高速、高效傳輸,本文開展了針對(duì)全光網(wǎng)絡(luò)中結(jié)合網(wǎng)絡(luò)編碼與正交頻分復(fù)用(Orthogonal Frequency Division Multiplexing:OFDM)技術(shù)的編碼機(jī)制和資源分配方案的研究,分別實(shí)現(xiàn)了物理層的硬件結(jié)構(gòu)設(shè)計(jì)、控制層中路由和頻譜資源分配策略規(guī)劃以及在無(wú)源光網(wǎng)絡(luò)中解決實(shí)際通信問題的應(yīng)用。主要?jiǎng)?chuàng)新點(diǎn)包括以下內(nèi)容： (1)針對(duì)面向多粒度業(yè)務(wù)的全光組播網(wǎng)絡(luò)節(jié)點(diǎn)技術(shù)進(jìn)行研究。面向彈性光網(wǎng)絡(luò)中大容量和多粒度組播業(yè)務(wù)傳輸需求,為物理層節(jié)點(diǎn)硬件結(jié)構(gòu)設(shè)計(jì)了一種全光OFDM網(wǎng)絡(luò)編碼機(jī)制。提出一種基于OFDM技術(shù)的頻譜分配方案,能夠根據(jù)不同傳輸速率的業(yè)務(wù)流量動(dòng)態(tài)調(diào)整。采用全光器件設(shè)計(jì)支持多粒度組播業(yè)務(wù)傳輸?shù)木W(wǎng)絡(luò)編碼節(jié)點(diǎn)結(jié)構(gòu),該結(jié)構(gòu)不僅能夠支持更高速率的傳輸,而且可以改善頻譜資源利用效率,兼顧了全光處理、網(wǎng)絡(luò)編碼以及OFDM帶來(lái)的技術(shù)優(yōu)勢(shì)。本文分別針對(duì)不同速率的組播業(yè)務(wù)進(jìn)行傳輸誤碼率實(shí)驗(yàn)仿真,仿真結(jié)果表明多粒度組播業(yè)務(wù)需求能夠被成功的傳輸,論證了設(shè)計(jì)結(jié)構(gòu)的可行性,并分析了不同的頻譜資源分配方案對(duì)組播業(yè)務(wù)傳輸性能的影響。另外考慮到實(shí)際的全光網(wǎng)絡(luò)編碼結(jié)果將受到光信號(hào)同步性的要求,在設(shè)計(jì)方案中提出采用展寬脈沖的處理手段,用以降低脈沖按位對(duì)齊的難度,改善全光異或編碼運(yùn)算中的對(duì)脈沖錯(cuò)位的容忍度。 (2)針對(duì)基于網(wǎng)絡(luò)編碼的光組播資源彈性分配機(jī)制進(jìn)行研究。在全光OFDM網(wǎng)絡(luò)編碼節(jié)點(diǎn)結(jié)構(gòu)的硬件支持基礎(chǔ)上,本文提出了一種基于網(wǎng)絡(luò)編碼多路傳輸?shù)穆酚深l譜分配機(jī)制(Routing and Spectrum Allocation:RSA)用以作為控制層中的資源配置及優(yōu)化策略。該機(jī)制不僅能夠?yàn)椴煌瑐鬏斔俾实慕M播業(yè)務(wù)高效、靈活地分配頻譜資源,還能夠有效地均衡網(wǎng)絡(luò)負(fù)載,提升網(wǎng)絡(luò)吞吐量,降低阻塞率。本文對(duì)提出的RSA機(jī)制進(jìn)行整數(shù)線性規(guī)劃,并將RSA問題分解基于網(wǎng)絡(luò)編碼的路由分配和基于多載波優(yōu)先的策略的頻譜資源分配兩個(gè)子問題進(jìn)行優(yōu)化。通過仿真實(shí)驗(yàn)分析系統(tǒng)資源在該分配機(jī)制下的傳輸性能。結(jié)果表明：提出的RSA機(jī)制能夠?yàn)椴煌６冉M播業(yè)務(wù)靈活高效分配頻譜資源,與最短路徑樹RSA機(jī)制和最小生成樹RSA機(jī)制相比,能夠有效節(jié)省20%以上的頻譜資源,同時(shí)有效保證網(wǎng)絡(luò)負(fù)載的均衡性。 (3)針對(duì)面向無(wú)源光網(wǎng)絡(luò)的全光組播網(wǎng)絡(luò)編碼應(yīng)用研究進(jìn)行研究。提出將全光OFDM網(wǎng)絡(luò)編碼組播機(jī)制應(yīng)用于解決無(wú)源光網(wǎng)絡(luò)(Passive Optical Network:PON)系統(tǒng)中的全光虛擬專用網(wǎng)絡(luò)(Virtual Private Network:VPN)對(duì)等通信的需求。設(shè)計(jì)方案可以成功實(shí)現(xiàn)光網(wǎng)絡(luò)單元(Optical Network Units:ONU)之間對(duì)等通信業(yè)務(wù)的全雙工通信傳輸,并提高了傳輸?shù)陌踩员ＷC。仿真實(shí)驗(yàn)結(jié)果說(shuō)明在PON系統(tǒng)中應(yīng)用基于OFDM全光網(wǎng)絡(luò)編碼的組播機(jī)制具有可行性。新機(jī)制的應(yīng)用不僅能夠滿足接入網(wǎng)中更高速的對(duì)等通信的業(yè)務(wù)傳輸需求,而且可以通過增加載波數(shù)目和每個(gè)載波所承載的傳輸速率來(lái)滿足不同速率業(yè)務(wù)傳輸?shù)男枨�。設(shè)計(jì)方案能夠有效支持更靈活的多速率業(yè)務(wù)傳輸和頻譜分配。
[Abstract]:With the rapid development of the broadband network , the proportion of the new multicast communication service in the whole data service is improved , and the user ' s pursuit of high quality multicast quality results in more and more requirements for the network bandwidth , which overcomes the limitation of the photoelectric conversion on the transmission rate and becomes an important supporting technology for transmitting high bandwidth and high rate multicast service , and simultaneously introduces the network coding technology into the whole optical multicast network , and can further improve the transmission efficiency , capacity and robustness of the optical multicast network , and provides an effective solution for the research of the high bandwidth multicast problem . At the same time , with the personalized and diversified multicast service requirements of the user , not only the network is required to have the capability of supporting large - capacity , high - speed transmission , but also multi - granularity services with variable rate can be transmitted efficiently , reliably and flexibly . In order to realize the high - speed and high - efficiency transmission of multi - granularity multicast service , the coding mechanism and resource allocation scheme for combining network coding and orthogonal frequency division multiplexing ( OFDM ) technology in all optical networks are studied . The hardware structure design of physical layer , the routing of control layer and the application of spectrum resource allocation strategy are implemented respectively . The main innovations include the following : ( 1 ) The technology of all - optical multicast network node oriented to multi - granularity service is studied . A full - optical OFDM network coding scheme is designed for physical layer node hardware in order to meet the demand of large - capacity and multi - granularity multicast service transmission in elastic optical network . A new spectrum allocation scheme based on OFDM technology is proposed . The simulation results show that the multi - granularity multicast service needs can be transmitted successfully . The simulation results show that the multi - granularity multicast service needs can be transmitted successfully . The paper proposes a routing and Spectrum Allocation : RSA , which can effectively and flexibly allocate spectrum resources for multicast service with different transmission rates . It can effectively balance the network load , improve the network throughput and reduce the blocking rate . The proposed RSA mechanism can effectively distribute spectrum resources for different granularity multicast services , and can effectively save more than 20 % spectrum resources for the shortest path tree RSA mechanism and the minimum spanning tree RSA mechanism , and effectively guarantee the balance of network load . This paper studies the application of all - optical multicast network coding in passive optical network ( PON ) system . The design scheme can successfully realize the full - duplex communication transmission between optical network units ( ONU ) and the whole - optical virtual private network ( VPN ) , and improve the security assurance of transmission . The simulation results show that the application of the new mechanism can satisfy the service transmission requirement of the higher speed peer - to - peer communication in the access network . The design scheme can support more flexible multi - rate service transmission and spectrum allocation .

【學(xué)位授予單位】：北京郵電大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN911.2

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本文編號(hào)：1380373