弹性光网络中路由和频谱分配问题研究
发布时间：2019-06-10 16:43
【摘要】：传统的波分复用网络采用固定波长资源的分配模式,无法适应当今高速发展的互联网业务的需求。以光正交频分复用技术为基础的弹性光网络可以提供精细颗粒的频隙划分,有效提高了带宽资源的利用率和带宽分配的灵活性。本论文采用理论分析和数值仿真等方法,针对弹性光网络中路由和频谱分配、以及频谱碎片整理问题进行了全面深入的研究。论文首先简述了弹性光网络原理、架构和关键技术,详细分析了弹性光网络中的路由和频谱分配算法。论文深入分析了弹性光网络中特有的频谱碎片问题,提出了一种碎片离散度评估方案,根据碎片大小赋予相应的碎片权值,以此来衡量网络中的碎片化程度。论文据此提出一种基于频谱碎片权值评估的路由和频谱分配算法,将碎片离散度作为业务请求时选择路由的一个依据,优先选择碎片离散度高且有足够频谱资源的路由作为工作路径,理论分析和数值仿真结果表明该算法可以充分利用频谱碎片,提高频谱资源利用率。论文还提出了一种基于频谱搬移的周期式碎片整理算法,结合两种碎片整理触发策略,在业务发生阻塞时通过频谱部分搬移的方式重新分配频谱,只有当路径上碎片化程度达到门限值时才会进行频谱重构。仿真结果表明改进算法在业务阻塞率和频谱利用率方面都有较明显的改善。
[Abstract]:The traditional WDM network adopts the allocation mode of fixed wavelength resources, which can not meet the needs of the rapid development of Internet services. The elastic optical network based on optical orthogonal frequency division reuse technology can provide the frequency gap division of fine particles, which effectively improves the utilization of bandwidth resources and the flexibility of bandwidth allocation. In this paper, theoretical analysis and numerical simulation are used to study the routing, spectrum allocation and spectrum defragmentation in elastic optical networks. Firstly, the principle, architecture and key technologies of elastic optical network are briefly described, and the routing and spectrum allocation algorithms in elastic optical network are analyzed in detail. In this paper, the unique spectrum fragment problem in elastic optical network is deeply analyzed, and a fragment dispersion evaluation scheme is proposed, which gives the corresponding fragment weight according to the size of the fragment, so as to measure the fragmentation degree in the network. Based on this, a routing and spectrum allocation algorithm based on spectrum fragment weight evaluation is proposed in this paper, in which fragment dispersion is used as a basis for selecting routing in service requests. The route with high dispersion of fragments and sufficient spectrum resources is preferred as the working path. Theoretical analysis and numerical simulation results show that the algorithm can make full use of spectrum fragments and improve the efficiency of spectrum resources. A periodic defragmentation algorithm based on spectrum migration is also proposed in this paper. Combined with two defragmentation trigger strategies, the spectrum is reallocated by spectrum partial migration in the event of traffic blocking. Spectrum reconstruction will be carried out only when the fragmentation degree on the path reaches the threshold value. The simulation results show that the improved algorithm has obvious improvement in traffic blocking rate and spectrum efficiency.
【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
[Abstract]:The traditional WDM network adopts the allocation mode of fixed wavelength resources, which can not meet the needs of the rapid development of Internet services. The elastic optical network based on optical orthogonal frequency division reuse technology can provide the frequency gap division of fine particles, which effectively improves the utilization of bandwidth resources and the flexibility of bandwidth allocation. In this paper, theoretical analysis and numerical simulation are used to study the routing, spectrum allocation and spectrum defragmentation in elastic optical networks. Firstly, the principle, architecture and key technologies of elastic optical network are briefly described, and the routing and spectrum allocation algorithms in elastic optical network are analyzed in detail. In this paper, the unique spectrum fragment problem in elastic optical network is deeply analyzed, and a fragment dispersion evaluation scheme is proposed, which gives the corresponding fragment weight according to the size of the fragment, so as to measure the fragmentation degree in the network. Based on this, a routing and spectrum allocation algorithm based on spectrum fragment weight evaluation is proposed in this paper, in which fragment dispersion is used as a basis for selecting routing in service requests. The route with high dispersion of fragments and sufficient spectrum resources is preferred as the working path. Theoretical analysis and numerical simulation results show that the algorithm can make full use of spectrum fragments and improve the efficiency of spectrum resources. A periodic defragmentation algorithm based on spectrum migration is also proposed in this paper. Combined with two defragmentation trigger strategies, the spectrum is reallocated by spectrum partial migration in the event of traffic blocking. Spectrum reconstruction will be carried out only when the fragmentation degree on the path reaches the threshold value. The simulation results show that the improved algorithm has obvious improvement in traffic blocking rate and spectrum efficiency.
【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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