弹性光网络中碎片问题的研究

摘要

Elastic optical networks (EON) should be suitable for the two constrains of wavelength continuity and spectrum continuity when routing and spectrum matching. As a result, there will be a great deal of frag-mentation in the network spectrum when building and terminating lightpaths in a dynamic manner. In order to improve the degree of EON fragmentation, this paper proposes a dynamic routing and dynamic spectrum fiting (DRDSF) strategy, and builds an experimental model to simulate the business blocking rate and spectrum re-source utilization. The experimental results show that the DRDSF spectrum is more effective in controlling the spectrum fragmentation in EON dynamic business environment, compared with the traditional defragmenta-tion cleaning mechanism. What is more, network performance can be improved significantly.%由于弹性光网络(EON)在路由和频谱匹配时须同时满足波长连续性和频谱连续性双重约束,因此在频繁地动态建立和终结光路过程中,网络频谱将出现大量碎片.为改善EON碎片程度,提出一种动态路由和动态频谱匹配(Dynamic Routing and Dynamic Spectrum Fiting,DRDSF)策略,并通过构建实验模型对业务阻塞率和频谱资源利用率指标进行仿真分析.实验结果显示,相对于传统碎片清理机制,应用DRDSF策略后EON动态业务环境中产生的频谱碎片问题得到了更有效的控制,网络性能显著提高.