灵活栅格光网络中时变业务的频谱分配

发布时间：2018-08-30 17:26

【摘要】：近年来,随着新兴网络技术的发展,各种宽带业务与日俱增,传统的波分复用(WDM)系统渐渐无法满足新业务的带宽需求和灵活性要求。灵活栅格光网络的出现,满足了当前网络大容量和多样化的需求,其更小的频谱粒度和更灵活的分配方案,大大提高了网络资源的利用率和灵活性。但在实时通信中,通信业务量会随着时间波动。因此也要考虑动态光路中业务的多样性和时变性,为其灵活地分配频谱,适应网络业务需求。本文主要研究灵活栅格光网络中时变业务的频谱分配问题和基于软件定义光网络技术的控制平面问题。首先在已有直接阻塞新业务的频谱分配方案和基于重分配业务频谱分配方案的基础上,提出了基于非邻接性虚拟连接的频谱分配方案以解决时变业务的频谱分配问题。采用OMNeT++仿真软件搭建灵活光网络平台,对三种方案进行仿真,得出基于非邻接性虚拟连接的频谱分配算法,不需要改变原用户业务已分配频谱块,仅仅需要为业务新增加的需求带宽分配与之不相邻的新频谱块,用来满足传输过程中业务变化的带宽需求。该方案能够优化时变网络的性能、降低网络阻塞率、保证业务不发生中断、提高全网频谱资源的利用率。所提出的方案综合性能最好,是比较适合于时变业务的频谱分配方案。在处理复杂而多样的时变业务时需要考虑到其控制平面问题。本文引入基于OpenFlow技术的软件定义光网络(SDON)来解决时变业务的控制平面问题,基于SDON的三层模型,构建了一种跨层控制架构模型,以应用层和控制层为主,能够更加合理有效地使用网络资源。
[Abstract]:In recent years, with the development of new network technology, a variety of broadband services are increasing. The traditional WDM (WDM) system is gradually unable to meet the bandwidth requirements and flexibility requirements of new services. The emergence of flexible grid optical network meets the needs of large capacity and diversity of the current network. Its smaller spectrum granularity and more flexible allocation scheme greatly improve the utilization and flexibility of network resources. But in real-time communication, the traffic will fluctuate with time. Therefore, it is necessary to consider the diversity and time-varying of the traffic in the dynamic optical path, and allocate the spectrum flexibly to meet the needs of the network services. This paper focuses on the spectrum allocation of time-varying traffic in flexible grid optical networks and the control plane problem based on the software defined optical network technology. Based on the existing spectrum allocation scheme for new traffic with direct blocking and spectrum allocation scheme based on rescheduled traffic, a spectrum allocation scheme based on non-adjacent virtual connection is proposed to solve the problem of spectrum allocation for time-varying traffic. Using OMNeT simulation software to build flexible optical network platform, three schemes are simulated, and the spectrum allocation algorithm based on non-adjacent virtual connection is obtained, without changing the allocated spectrum block of the original user service. It is only necessary to allocate new spectrum blocks that are not adjacent to the newly added bandwidth of the traffic to meet the bandwidth requirements of the traffic changes during the transmission process. This scheme can optimize the performance of time-varying network, reduce the blocking rate of the network, ensure that the traffic will not be interrupted, and improve the utilization ratio of spectrum resources in the whole network. The proposed scheme has the best comprehensive performance and is more suitable for time-varying traffic spectrum allocation. The control plane problem should be taken into account when dealing with complex and diverse time-varying traffic. In this paper, the software definition of optical network (SDON) based on OpenFlow technology is introduced to solve the control plane problem of time-varying traffic. Based on the three-layer model of SDON, a cross-layer control architecture model is constructed, which mainly consists of application layer and control layer. More rational and effective use of network resources.
【学位授予单位】：南京邮电大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TN929.1

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