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多粒度光网络的流量疏导及联合生存性

Traffic Grooming in Multi-Granularity Networks and Joint-Survivability

【作者】 吕薇

【导师】 顾畹仪;

【作者基本信息】 北京邮电大学 , 电磁场与微波技术, 2006, 硕士

【摘要】 本论文主要研究了多粒度光网络的流量疏导问题以及多层网络的联合生存性问题。通过设计合理的路由策略,将小粒度的业务向大粒度聚合,优化层间交叉的比例,实施流量疏导机制,实现业务对网络资源的合理占用,优化网络性能,提高业务质量。综合考虑亚波长、波长、波带等多层的保护和恢复机制,协调层间路由方案,充分利用控制平面路由协议定义的流量工程链路(即TE链路)的属性信息,提出SRLG分离的生存性仿真实现模型。 论文第二章阐述了基于流量工程的GMPLS控制平面的工作机制,分析了多粒度交换网络的层次模型,给出多粒度交换网络的节点结构及费用模型,为下一章的算法性能仿真提供了比较的依据。 网络带宽的发展导致了交换节点中交叉连接矩阵规模的迅速增加,使得节点的成本以及对其管理和控制的难度随之增加。采用多粒度交换技术之后,直通业务可以通过建立波带级或者是光纤级交叉连接直接实现交换,因此可以大大减少交换节点的端口数量,并降低波长级交叉连接矩阵的规模,从而降低节点的成本。但OXC成本的降低是以牺牲灵活性为代价的,为了提高网络资源的利用效率,降低网络阻塞率,设计良好的路由与资源分配策略是非常重要的。 论文第三章详细分析了多粒度网络的流量疏导问题,提出了两步隧道重利用(Two-Step Tunnel Reusing,TSTR)和平衡路由双向FF(Balanced routing Bi-direction First Fit,BBFF)两种多粒度静态业务疏导算法,并结合多粒度光交换节点的结构及费用模型,在14节点的NSFNET网络拓扑上进行了性能仿真。仿真结果表明,两种算法能够有效降低网络成本,对运营商具有一定的参考价值。 在下一代光网络中,由于每一层网络都有自己独立的生存性机制,在网络出现故障的情况下,各层都可能出现告警,如果每层都启动自己的生存性机制,但没有协调的话,最终可能导致网络处于一片混乱,并且对受损的业务保护不成功。此外在一个多层网络中,如果每层网络都保留自己的生存性机制,势必导致网络的资源利用率过低,所以在一个多层网络中,对各层的生存性机制如何进行舍取以及协调是一个非常值得研究的课题。

【Abstract】 The traffic grooming problem in multi-granularity optical networks and the joint-survivability problem in multi-layer networks are analyzed in this dissertation. Minor-granularity traffics are groomed into major-granularity by properly designed routing scenarios. The ratio of cross-connects between layers is optimized. Introducing traffic grooming can realize the reasonable occupation of network resources by traffics, then the network performance is improved and the QoS of traffics are also improved. Putting the protection and restoration of sub-wavelength, wavelength and waveband together, routing schemes between layers are coordinated. The simulation model of SRLG-disjoint survivability is proposed by utilizing the property information of TE links. Chapter II describes the working mechanism of GMPLS control plan based on traffic engineering and analyzes the layer model of multi-granularity networks. The node structure and its cost model are offered as basis of performance simulation in next chapter. The increase of bandwidth brings the fast increase of cross-connect size in switching nodes in the network, and the cost of node and the complexity of management and control are also increased. Bypass traffics can be switched by establishing a waveband or fiber layer cross-connect when the multi- granularity switching technology is introduced. Therefore, the number of ports in switching nodes and the cost can be greatly decreased. The decrease of node cost is on the cost of losing flexibility. Designing fine RRA algorithms is very important to improve the utilization of network resources.

【关键词】 多粒度流量疏导生存性QoS
【Key words】 multi-granularitytraffic groomingsurvivabilityQoS
  • 【分类号】TN929.1
  • 【被引频次】10
  • 【下载频次】234
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