基于保护机制优先级的光网络生存性研究

发布时间：2018-05-03 22:25

本文选题：光网络生存性 + 波长转换　；参考：《南京邮电大学》2017年硕士论文

【摘要】：随着光纤通信技术的迅速成熟,光网络可以给用户提供快速、优质的服务。随着用户数量以及总业务量越来越多,故障发生数量也大幅提升,即使很短的一段时间内的业务服务中断,可能会带来灾难性的后果。因此,如何提高光网络应对故障的能力,使服务的损失减少到最小,使得生存性的研究成为光网络发展中一项至关重要的研究内容。本文对链路保护、节点保护等关键技术展开分析,给出选取拓扑结构中保护优先级最高的链路和节点的理论基础,为系统仿真提供理论依据;基于链路删除法,选取拓扑结构中优先级最高的链路,通过分析1+1保护和共享保护两种保护,结合两种保护的特点,在Mesh网中设计交叉型保护方案;基于集团度算法,判断拓扑结构中不同节点的保护优先级,根据保护优先级确定保护方案,讨论在不同数量的节点具备波长转换功能时光网络系统生存性性能发生的变化。利用OPNET Modeler软件构建网络拓扑结构,通过仿真研究交叉保护对生存性参数的改善情况,并研究不同的节点具备波长转换能力时对光网络阻塞率的影响。仿真结果表明:本文设计的基于1+1保护与共享保护的交叉保护,保持了Mesh共享网络的低冗余度、低阻塞率的优点,在保护恢复成功率以及恢复时间上较Mesh网有较大提升;当光网络拓扑结构中的保护优先级最高节点具备波长转换功能时,相比于全波长转换功能的网络更利于实现,对比无波长转换网络在阻塞率上有明显改善,并且保护优先级最高的节点具备波长转换功能时,相比优先级较低的节点对于系统性能的提升最为明显。
[Abstract]:With the rapid development of optical fiber communication technology, optical network can provide fast and high quality service to users. As the number of users and the total volume of business grows, the number of failures also increases dramatically, even if business services are interrupted for a short period of time, which may have disastrous consequences. Therefore, how to improve the ability of the optical network to deal with the failure, reduce the loss of service to the minimum, make the research of survivability become an important research content in the development of optical network. In this paper, the key technologies of link protection and node protection are analyzed, and the theoretical basis of selecting the link and node with the highest protection priority in topology structure is given, which provides the theoretical basis for system simulation. Selecting the link with the highest priority in the topology structure, combining the characteristics of the two kinds of protection, we design the cross protection scheme in Mesh net by analyzing the protection of 11 protection and the shared protection, which is based on the group degree algorithm. The protection priority of different nodes in topology is judged and the protection scheme is determined according to the protection priority. The changes of survivability in different number of nodes with wavelength conversion function are discussed. The network topology is constructed by using OPNET Modeler software, and the improvement of survivability parameters by cross-protection is studied by simulation, and the influence of different nodes with wavelength conversion ability on the blocking rate of optical network is studied. The simulation results show that the cross-protection based on 11 protection and shared protection in this paper keeps the advantages of low redundancy and low blocking rate of Mesh shared network, and improves the protection recovery success rate and recovery time compared with Mesh network. When the highest protection priority node in optical network topology has the function of wavelength conversion, compared with the network with full wavelength conversion function, it is more convenient to realize, and the blocking rate of no wavelength conversion network is improved obviously. When the node with the highest protection priority has wavelength conversion function, the performance of the node with lower priority is the most obvious.
【学位授予单位】：南京邮电大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN929.1

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