【摘要】：傳統(tǒng)的波分復(fù)用網(wǎng)絡(luò)采用固定波長資源的分配模式,無法適應(yīng)當(dāng)今高速發(fā)展的互聯(lián)網(wǎng)業(yè)務(wù)的需求。以光正交頻分復(fù)用技術(shù)為基礎(chǔ)的彈性光網(wǎng)絡(luò)可以提供精細顆粒的頻隙劃分,有效提高了帶寬資源的利用率和帶寬分配的靈活性。本論文采用理論分析和數(shù)值仿真等方法,針對彈性光網(wǎng)絡(luò)中路由和頻譜分配、以及頻譜碎片整理問題進行了全面深入的研究。論文首先簡述了彈性光網(wǎng)絡(luò)原理、架構(gòu)和關(guān)鍵技術(shù),詳細分析了彈性光網(wǎng)絡(luò)中的路由和頻譜分配算法。論文深入分析了彈性光網(wǎng)絡(luò)中特有的頻譜碎片問題,提出了一種碎片離散度評估方案,根據(jù)碎片大小賦予相應(yīng)的碎片權(quán)值,以此來衡量網(wǎng)絡(luò)中的碎片化程度。論文據(jù)此提出一種基于頻譜碎片權(quán)值評估的路由和頻譜分配算法,將碎片離散度作為業(yè)務(wù)請求時選擇路由的一個依據(jù),優(yōu)先選擇碎片離散度高且有足夠頻譜資源的路由作為工作路徑,理論分析和數(shù)值仿真結(jié)果表明該算法可以充分利用頻譜碎片,提高頻譜資源利用率。論文還提出了一種基于頻譜搬移的周期式碎片整理算法,結(jié)合兩種碎片整理觸發(fā)策略,在業(yè)務(wù)發(fā)生阻塞時通過頻譜部分搬移的方式重新分配頻譜,只有當(dāng)路徑上碎片化程度達到門限值時才會進行頻譜重構(gòu)。仿真結(jié)果表明改進算法在業(yè)務(wù)阻塞率和頻譜利用率方面都有較明顯的改善。
[Abstract]:The traditional WDM network adopts the allocation mode of fixed wavelength resources, which can not meet the needs of the rapid development of Internet services. The elastic optical network based on optical orthogonal frequency division reuse technology can provide the frequency gap division of fine particles, which effectively improves the utilization of bandwidth resources and the flexibility of bandwidth allocation. In this paper, theoretical analysis and numerical simulation are used to study the routing, spectrum allocation and spectrum defragmentation in elastic optical networks. Firstly, the principle, architecture and key technologies of elastic optical network are briefly described, and the routing and spectrum allocation algorithms in elastic optical network are analyzed in detail. In this paper, the unique spectrum fragment problem in elastic optical network is deeply analyzed, and a fragment dispersion evaluation scheme is proposed, which gives the corresponding fragment weight according to the size of the fragment, so as to measure the fragmentation degree in the network. Based on this, a routing and spectrum allocation algorithm based on spectrum fragment weight evaluation is proposed in this paper, in which fragment dispersion is used as a basis for selecting routing in service requests. The route with high dispersion of fragments and sufficient spectrum resources is preferred as the working path. Theoretical analysis and numerical simulation results show that the algorithm can make full use of spectrum fragments and improve the efficiency of spectrum resources. A periodic defragmentation algorithm based on spectrum migration is also proposed in this paper. Combined with two defragmentation trigger strategies, the spectrum is reallocated by spectrum partial migration in the event of traffic blocking. Spectrum reconstruction will be carried out only when the fragmentation degree on the path reaches the threshold value. The simulation results show that the improved algorithm has obvious improvement in traffic blocking rate and spectrum efficiency.
【學(xué)位授予單位】：南京郵電大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TN929.1

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本文編號：2496585