铁路光传送网络故障产生与生存性研究

发布时间：2018-02-15 02:11

本文关键词： 光传送网络(OTN) 保护与恢复业务可靠度 RWA 生存性　出处：《北京交通大学》2017年硕士论文　论文类型：学位论文

【摘要】：随着智能光网络在铁路中的应用,以及铁路传输网中大颗粒数据业务的不断涌现,光传送网络(Optical Transport Network,OTN)作为下一代传输网技术的典型代表,正逐渐成为铁路通信传输网的主流技术。铁路光传送网作为铁路数据信息的主要承载网络,承载着列车运行、调度、移动通信、视频监控等各类信息。现阶段铁路OTN的传输速率已由10G逐步向40G、100G过渡,在这种高速率、大容量、多业务的传输网中,网络故障将会给铁路带来潜在的安全隐患。为了防止网络部件失效给铁路业务造成巨大的影响和损失,网络生存性成为铁路传输网规划与设计的关键性能指标。本论文主要从铁路OTN的保护技术和基于路由与波长分配(Routing and Wavelength Assignment,RWA)算法的全网业务可靠度约束两方面对网络的生存性进行相关的定量分析,并根据数值结果进行了算法性能的比较和分析,主要工作和具体的研究成果如下:1.通过搭建不同的OTN保护测试环境,利用相关测试仪表获取实际的测试数据,在对理论进行验证的同时,分析得到了 OTN各种保护技术的故障处理流程,包括故障检测、开销处理、故障通知以及保护倒换。通过生存性评价指标分别对各种保护技术进行了分析与比较,获得了适合不同网络实际场景的保护技术方案。2.解决了铁路光传送网静态业务下的网络生存性设计问题。通过将RWA问题分解为路由选择子问题和波长分配子问题,提出了基于单链路失效的业务可靠度约束RWA算法。在路由选择子问题中,从全网业务可靠度要求的角度描述单链路失效对全网业务的影响,把具有最优可靠度Rm的路由方案分配给光路连接请求,以降低链路失效对全网业务的风险。在波长分配子问题中,利用以上路由选择结果,对全网的波长设定目标函数和约束条件,建立整数线性规划(Integer linear programming,ILP)专用通路保护模型,为光路连接请求分配波长。通过对具有不同规模的网络拓扑结构进行仿真计算,验证该算法的各项性能。仿真结果表明,相比于传统的最短路径(ShortestPath,SP)算法,该算法可以极大地提高全网业务的可靠性程度,在降低网络风险的同时也具有较高的波长资源利用率。3.提出了基于多链路失效的业务可靠度约束RWA算法。在路由选择子问题中,在传统的只采用一个保护路段来保护工作通路上某一个工作路段方法的基础上,通过增加多个保护路段保护工作路上多个工作路段的方式来提高光路连接请求的可靠性。通过采用与单链路相同的波长分配策略为光路连接请求分配波长,并对其仿真结果进行了分析。
[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.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN929.1

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