本文關(guān)鍵詞： 光傳送網(wǎng)絡(OTN) 保護與恢復 業(yè)務可靠度 RWA 生存性　出處：《北京交通大學》2017年碩士論文　論文類型：學位論文

【摘要】：隨著智能光網(wǎng)絡在鐵路中的應用,以及鐵路傳輸網(wǎng)中大顆粒數(shù)據(jù)業(yè)務的不斷涌現(xiàn),光傳送網(wǎng)絡(Optical Transport Network,OTN)作為下一代傳輸網(wǎng)技術(shù)的典型代表,正逐漸成為鐵路通信傳輸網(wǎng)的主流技術(shù)。鐵路光傳送網(wǎng)作為鐵路數(shù)據(jù)信息的主要承載網(wǎng)絡,承載著列車運行、調(diào)度、移動通信、視頻監(jiān)控等各類信息�，F(xiàn)階段鐵路OTN的傳輸速率已由10G逐步向40G、100G過渡,在這種高速率、大容量、多業(yè)務的傳輸網(wǎng)中,網(wǎng)絡故障將會給鐵路帶來潛在的安全隱患。為了防止網(wǎng)絡部件失效給鐵路業(yè)務造成巨大的影響和損失,網(wǎng)絡生存性成為鐵路傳輸網(wǎng)規(guī)劃與設(shè)計的關(guān)鍵性能指標。本論文主要從鐵路OTN的保護技術(shù)和基于路由與波長分配(Routing and Wavelength Assignment,RWA)算法的全網(wǎng)業(yè)務可靠度約束兩方面對網(wǎng)絡的生存性進行相關(guān)的定量分析,并根據(jù)數(shù)值結(jié)果進行了算法性能的比較和分析,主要工作和具體的研究成果如下:1.通過搭建不同的OTN保護測試環(huán)境,利用相關(guān)測試儀表獲取實際的測試數(shù)據(jù),在對理論進行驗證的同時,分析得到了 OTN各種保護技術(shù)的故障處理流程,包括故障檢測、開銷處理、故障通知以及保護倒換。通過生存性評價指標分別對各種保護技術(shù)進行了分析與比較,獲得了適合不同網(wǎng)絡實際場景的保護技術(shù)方案。2.解決了鐵路光傳送網(wǎng)靜態(tài)業(yè)務下的網(wǎng)絡生存性設(shè)計問題。通過將RWA問題分解為路由選擇子問題和波長分配子問題,提出了基于單鏈路失效的業(yè)務可靠度約束RWA算法。在路由選擇子問題中,從全網(wǎng)業(yè)務可靠度要求的角度描述單鏈路失效對全網(wǎng)業(yè)務的影響,把具有最優(yōu)可靠度Rm的路由方案分配給光路連接請求,以降低鏈路失效對全網(wǎng)業(yè)務的風險。在波長分配子問題中,利用以上路由選擇結(jié)果,對全網(wǎng)的波長設(shè)定目標函數(shù)和約束條件,建立整數(shù)線性規(guī)劃(Integer linear programming,ILP)專用通路保護模型,為光路連接請求分配波長。通過對具有不同規(guī)模的網(wǎng)絡拓撲結(jié)構(gòu)進行仿真計算,驗證該算法的各項性能。仿真結(jié)果表明,相比于傳統(tǒng)的最短路徑(ShortestPath,SP)算法,該算法可以極大地提高全網(wǎng)業(yè)務的可靠性程度,在降低網(wǎng)絡風險的同時也具有較高的波長資源利用率。3.提出了基于多鏈路失效的業(yè)務可靠度約束RWA算法。在路由選擇子問題中,在傳統(tǒng)的只采用一個保護路段來保護工作通路上某一個工作路段方法的基礎(chǔ)上,通過增加多個保護路段保護工作路上多個工作路段的方式來提高光路連接請求的可靠性。通過采用與單鏈路相同的波長分配策略為光路連接請求分配波長,并對其仿真結(jié)果進行了分析。
[Abstract]:With the application of intelligent optical network in railway and the continuous emergence of large-size data service in railway transmission network, optical Transport network is a typical representative of the next generation transmission network technology. As the main carrying network of railway data information, railway optical transmission network is carrying train operation, dispatching and mobile communication. Video surveillance and other kinds of information. At present, the transmission rate of railway OTN has been gradually transferred from 10G to 40G / 100G. In this kind of high speed, large capacity, multi-service transmission network, In order to prevent the failure of network components from causing huge impact and loss to railway business, network failure will bring potential safety risks to railway. Network survivability has become the key performance index of railway transmission network planning and design. This paper mainly analyzes the network from two aspects: the protection technology of railway OTN and the reliability constraint of the whole network based on routing and Wavelength assignment RWA-based routing and wavelength assignment algorithm. The survivability of collaterals is quantitatively analyzed. According to the numerical results, the performance of the algorithm is compared and analyzed. The main work and specific research results are as follows: 1. By setting up different OTN protection test environment, using relevant test instruments to obtain actual test data. At the same time of verifying the theory, the fault processing flow of various protection technologies of OTN, including fault detection, overhead processing, is obtained. Fault notification and protection switching. By means of survivability evaluation indexes, various protection techniques are analyzed and compared. In this paper, the scheme of protection technology suitable for different network scenarios is obtained. 2. The survivability design problem of railway optical transport network under static traffic is solved. The RWA problem is decomposed into routing sub-problem and wavelength assignment sub-problem. In this paper, a service reliability constrained RWA algorithm based on single link failure is proposed. In the routing sub-problem, the effect of single link failure on the whole network service is described from the point of view of the reliability requirement of the whole network service. In order to reduce the risk of link failure to the whole network traffic, the routing scheme with optimal reliability RM is assigned to the optical path connection request. In the wavelength assignment subproblem, the above route selection results are used. The objective function and constraint condition of wavelength setting for the whole network are set up, and the special path protection model of integer linear programming (Integer linear programming) is established, which assigns wavelength to the optical path connection request. The network topology with different scale is simulated and calculated. The simulation results show that compared with the traditional shortest path path algorithm, this algorithm can greatly improve the reliability of the whole network service. At the same time, the network risk is reduced and the wavelength resource utilization ratio is high. 3. A service reliability constrained RWA algorithm based on multi-link failure is proposed. On the basis of the traditional method of using only one protective section to protect one working section on the working path, In order to improve the reliability of optical path connection request, the reliability of optical path connection request is improved by increasing the number of working sections on the protection road of multiple protected road sections.; by adopting the same wavelength assignment strategy as the single link, the optical path connection request is assigned wavelength by using the same wavelength assignment strategy as the single link. The simulation results are analyzed.
【學位授予單位】：北京交通大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TN929.1

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本文編號：1512177