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  本文選題：彈性光網(wǎng)絡(luò) + 路由和頻譜分配　； 參考：《中國科學技術(shù)大學》2016年博士論文

【摘要】：彈性光網(wǎng)絡(luò)是近年來光網(wǎng)絡(luò)領(lǐng)域最重要的研究熱點之一。彈性光網(wǎng)絡(luò)的頻譜靈活性在帶來諸多優(yōu)勢的同時,也帶來了新的挑戰(zhàn)。由于不同業(yè)務類型、不同調(diào)制格式、不同顆粒度的子載波信道在網(wǎng)絡(luò)中共存,使得在彈性光網(wǎng)絡(luò)中頻譜資源的實時控制和管理復雜、頻譜分配約束條件增多、光傳輸過程中的物理損傷影響較大。因此,彈性光網(wǎng)絡(luò)面臨的當務之急是實現(xiàn)在滿足能耗和傳輸質(zhì)量的前提下對底層的頻譜資源進行實時的控制和管理。其中,路由和頻譜分配(Routing and Spectrum Allocation, RSA)或路由,調(diào)制等級和頻譜分配(Routing, Modulation Level and Spectrum Allocation, RMSA)問題是需要解決的關(guān)鍵問題之一由于在資源分配的過程中需要考慮多種限制條件,比如頻譜鄰接性限制、頻譜不重疊性限制以及頻譜連續(xù)性限制,彈性光網(wǎng)絡(luò)中的RSA/RMSA問題比DWDM網(wǎng)絡(luò)中路由和波長分配(Routing and Wavelength Assignment, RWA)問題更加復雜,而且不能直接利用之前提出的用于解決RWA問題的方案來解決。針對彈性光網(wǎng)絡(luò)中的RSA/RMSA策略方面的研究,目前在國內(nèi)外已取得一定的進展。但是,大部分提出的RSA/RMSA策略都只考慮單一請求類型的網(wǎng)絡(luò)業(yè)務,即即時資源預留請求。然而,在實際網(wǎng)絡(luò)場景中通常是具有不同服務質(zhì)量參數(shù)的網(wǎng)絡(luò)應用混合傳輸?shù)那闆r。據(jù)此,本文將面向彈性光網(wǎng)絡(luò)這一研究熱點,擬先介紹彈性光網(wǎng)絡(luò)中的帶寬資源分配與調(diào)度問題,然后考慮網(wǎng)絡(luò)業(yè)務在時延敏感度和帶寬感知度等方面的差異性,分別針對即時資源預留請求、提前資源預留請求以及彈性資源預留請求設(shè)計帶寬資源分配與調(diào)度算法,并通過仿真驗證提出的算法能夠有效地降低請求阻塞率和提高網(wǎng)絡(luò)資源利用率,最后介紹軟件定義彈性光網(wǎng)絡(luò)體系架構(gòu),并通過在控制平面上實現(xiàn)提前資源預留的實驗案例來分析如何在實際網(wǎng)絡(luò)場景中調(diào)用提出的帶寬資源分配與調(diào)度算法,以期望將本文的理論研究落到實地。
[Abstract]:Elastic optical network is one of the most important research hotspots in the field of optical network in recent years.The spectrum flexibility of elastic optical networks brings many advantages as well as new challenges.Because of the coexistence of subcarrier channels with different traffic types, different modulation formats and different particle sizes in the network, the real-time control and management of spectrum resources in elastic optical networks are complicated, and the constraints of spectrum allocation are increased.The physical damage in the process of optical transmission is very important.Therefore, the most urgent task for elastic optical networks is to realize real-time control and management of the underlying spectrum resources under the premise of satisfying energy consumption and transmission quality.Among them, routing and Spectrum allocation (RSAs) or routing, modulation level and spectrum allocation, Modulation Level and Spectrum allocation (RMSAs) is one of the key problems to be solved.For example, the problem of spectrum contiguity, spectrum nonoverlapping and spectral continuity, the RSA/RMSA problem in elastic optical networks is more complex than the routing and Wavelength assignment problem in DWDM networks.And can not directly use the previous proposed solution to solve the RWA problem to solve.Research on RSA/RMSA strategy in elastic optical networks has made some progress at home and abroad.However, most of the proposed RSA/RMSA policies only consider a single request type of network services, that is, real-time resource reservation requests.However, in the actual network scenario, it is usually a mixed transmission of network applications with different QoS parameters.Based on this, this paper first introduces the bandwidth resource allocation and scheduling problems in elastic optical networks, and then considers the differences of network traffic in terms of delay sensitivity and bandwidth perception.Bandwidth resource allocation and scheduling algorithms are designed for real-time resource reservation request, advance resource reservation request and elastic resource reservation request, respectively.Simulation results show that the proposed algorithm can effectively reduce the request blocking rate and improve the utilization of network resources. Finally, the software defined flexible optical network architecture is introduced.Through the experimental case of realizing the advance resource reservation on the control plane, this paper analyzes how to call the proposed bandwidth resource allocation and scheduling algorithm in the actual network scenario, in order to expect the theoretical research of this paper to fall to the field.
【學位授予單位】：中國科學技術(shù)大學
【學位級別】：博士
【學位授予年份】：2016
【分類號】：TN929.1

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