【摘要】：近年來,電信業(yè)有著最顯著的發(fā)展趨勢,以云計算、網(wǎng)絡電視(IPTV)、O2O (Online To Offline)、物聯(lián)網(wǎng)等為代表的新型業(yè)務日益興起。數(shù)據(jù)業(yè)務爆發(fā)式增長以及下一代網(wǎng)絡技術的發(fā)展,使電信運營商紛紛建設基于IP/MPLS over WDM的大容量、多業(yè)務承載網(wǎng)。下一代新型的電信業(yè)務與傳統(tǒng)電信業(yè)務相比,具有更高的動態(tài)特性和不可預測性,因此需要作為物理層的光網(wǎng)絡提供更高的靈活性和智能化功能,以便在網(wǎng)絡拓撲及業(yè)務分布發(fā)生變化時能夠快速響應,實現(xiàn)業(yè)務的靈活調(diào)度。在骨干承載網(wǎng)中,交換節(jié)點ROADM (Reconfigurable Optical Add/Drop Multiplexers)具有遠程配置功能,即可動態(tài)改變波長信道的上下路狀態(tài),實現(xiàn)了網(wǎng)絡資源的動態(tài)、靈活分配,大大簡化了網(wǎng)絡部署規(guī)劃,提高了網(wǎng)絡資源利用率。ROADM使得WDM光網(wǎng)絡具有可重構能力,使光網(wǎng)絡向智能化進一步發(fā)展。下一代的ROADM要求具備無色無向無競爭(CDC, Colorless, Directionless, Contentionless)的特性,其中無競爭性的實現(xiàn)需要在ROADM結構中增加“競爭消除”結構以避免節(jié)點內(nèi)部的波長競爭。這必然額外地增加了ROADM節(jié)點的硬件成本和功耗。因此本文在意識到節(jié)點內(nèi)部競爭的ROADM光網(wǎng)絡中,研究不同的收發(fā)機資源配置對光網(wǎng)絡性能的影響,去除節(jié)點內(nèi)冗余的“競爭消除”硬件。這樣,在實際應用中,優(yōu)化設計的ROADM節(jié)點不僅表現(xiàn)出無競爭特性,又使得光網(wǎng)絡獲得最佳的網(wǎng)絡性能。本文設計了一種具有業(yè)務疏導功能的ROADM交換節(jié)點結構,建立網(wǎng)絡資源調(diào)度算法的整數(shù)線性規(guī)劃(ILP, Integer Linear Programming)模型,設計相應的意識到節(jié)點內(nèi)部競爭的啟發(fā)性算法(INCF-RWA, Intra-node Contention-free RWA)。分析不同收發(fā)機資源配置與網(wǎng)絡性能之間的關系,在滿足最佳網(wǎng)絡性能的前提下,優(yōu)化ROADM結構,降低節(jié)點成本,減少節(jié)點功耗,最后分析了業(yè)務阻塞的原因。實驗仿真中,分別采用了主／備收發(fā)機模塊結構和共享式收發(fā)機模塊結構進行了研究。仿真結果顯示,每個模塊中的收發(fā)機數(shù)目與光纖鏈路中的波長數(shù)相等時,僅配置兩個收發(fā)機模塊的ROADM節(jié)點結構即可實現(xiàn)“無競爭”特性。同時,對于主／備收發(fā)機模塊結構,備用模塊中的收發(fā)機數(shù)目可以減少為主模塊收發(fā)機數(shù)目的37.5%;對于共享式收發(fā)機模塊結構,每個模塊中的收發(fā)機數(shù)目可以減少為波長數(shù)目的68.7%。通過優(yōu)化設計的ROADM結構,不僅去除了冗余硬件,又可獲得與“完全無競爭”ROADM結構近似相同的網(wǎng)絡性能,從而有效降低了網(wǎng)絡節(jié)點硬件成本和功耗。
[Abstract]:In recent years, the telecommunications industry has the most remarkable development trend, such as cloud computing, network television (IPTV) and O2O (Online To Offline), Internet of things as the representative of the new business is emerging. With the explosive growth of data services and the development of next generation network technology, telecom operators have built large capacity and multi-service carrying networks based on IP/MPLS over WDM. Compared with traditional telecommunication services, the next generation of new telecommunication services has higher dynamic characteristics and unpredictability. Therefore, optical networks as physical layer need to provide higher flexibility and intelligent functions. In order to quickly respond to the changes in network topology and service distribution, the flexible scheduling of services can be realized. In the backbone bearer network, the switching node ROADM (Reconfigurable Optical Add/Drop Multiplexers has the function of remote configuration, which can dynamically change the upper and lower state of the wavelength channel, realize the dynamic distribution of the network resources, and greatly simplify the network deployment planning. WDM optical network can be reconfigurable by improving the utilization ratio of network resource. ROADM makes the optical network develop intelligently. The next generation of ROADM requires a colorless, direction-free, non-competitive (CDC, Colorless, Directionless, Contentionless), in which a non-competitive implementation needs to add a "competition elimination" structure to the ROADM structure to avoid wavelength competition within the node. This inevitably increases the hardware cost and power consumption of ROADM nodes. Therefore, in the ROADM optical network, which is aware of the intra-node competition, the effects of different transceiver resource configurations on the performance of the optical network are studied, and the redundant "competition elimination" hardware in the node is removed. Thus, in practical applications, the optimized ROADM nodes not only show no competition, but also make the optical network obtain the best network performance. In this paper, a ROADM switching node structure with traffic grooming function is designed. The integer linear programming (ILP, Integer Linear Programming) model of network resource scheduling algorithm is established, and the corresponding heuristic algorithm (INCF-RWA, Intra-node Contention-free RWA).) is designed, which is aware of the intra-node competition. This paper analyzes the relationship between resource allocation of different transceivers and network performance, optimizes the ROADM structure, reduces node cost and reduces node power consumption under the premise of satisfying the optimal network performance. Finally, the causes of traffic congestion are analyzed. In the experiment simulation, the main / standby transceiver module structure and the shared transceiver module structure are studied. The simulation results show that when the number of transceivers in each module is equal to the number of wavelengths in the fiber link, the ROADM node structure with only two transceiver modules can achieve "no competition". At the same time, for the main / standby transceiver module structure, the number of transceivers in the standby module can be reduced to 37.5of the number of transceivers in the main module, and for the shared transceiver module structure, the number of transceivers in each module can be reduced to 68.7 percent of the wavelength number. By optimizing the ROADM structure, not only the redundant hardware is removed, but also the network performance is approximately the same as the "completely non-competitive" ROADM structure, which effectively reduces the network node hardware cost and power consumption.
【學位授予單位】：東南大學
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：TN929.1

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