共查询到18条相似文献,搜索用时 109 毫秒
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为了有效地传输不同波长粒度的业务,对多粒度光网络波带组合进行了研究。首先介绍了多粒度光网络的模型和光交叉节点,并在此基础上分析了多粒度交叉连接结构的两种结构,单层和多层多粒度交换结构。结合多粒度的交换结构,给出了几种波带组合策略,并对这些策略进行了分析和比较。 相似文献
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提出了适应这一增长趋势的多粒度光交换技术,对多粒度光交换系统节点在网络中做了相应部署,分析了多粒度交换网络环境下的流量梳理,最后进行多粒度故障检测,利用GMPLS协议针对多粒度LSP实现故障通知,完成相应的保护/恢复过程. 相似文献
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多粒度交换技术利用波带级路由以及光纤级路由,可有效降低光交叉连接器的复杂度。但多粒度交换增加了光网络的逻辑层次结构,使得网络中的路由与资源分配问题更为复杂,因此,在多粒度全光网中实现多层联合路由是提高网络性能的关键。本文对多粒度交叉连接结构进行了分析,并对多粒度全光网中的多层联合路由问题进行了研究。 相似文献
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多粒度交换技术利用波带级路由以及光纤级路由,可有效降低光交叉连接的复杂度,但多粒度交换增加了光网络的逻辑层次结构,便得网络中的路由与资源分配问题更为复杂,多粒度全光网中的多层联合路由机制是影响网络性能的关键。本文对动态业务下多粒度全光网中的资源分配策略进行了深入研究,比较了采用不同节点交换比例时网络的阻塞性能,分析了不同业务量时多粒度交叉连接节点的最佳波带粒度,并结合经济性对多粒度全光网的性能进行了综合分析。 相似文献
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多粒度光交换能减小光交叉连接矩阵的规模,降低光节点的成本,然而现有多粒度光交换结构的最小交换粒度常为波长,该交换粒度太大,会导致核心节点的链路利用率低。在多层MG-OXC基础上,提出了一种新型多粒度交换结构,实现了波带交换和OTDM的结合。该新型MG-OXC结构端口较少,并且可以提高传输速率,同时也因此降低了同等信息量下波长的使用数量,为网络提供了更大的传输容量,能够很好地适应光网络发展的需要。 相似文献
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Helvecio M. Almeida Eduardo M. G. de Queiroz Eduardo J. Aloia Murilo A. Romero Amilcar C. Cesar 《Photonic Network Communications》2011,22(2):151-161
This paper analyses an optical network architecture composed by an arrangement of nodes equipped with multi-granular optical
cross-connects (MG-OXCs) in addition to the usual optical cross-connects (OXCs). Then, selected network nodes can perform
both waveband as well as traffic grooming operations and our goal is to assess the improvement on network performance brought
by these additional capabilities. Specifically, the influence of the MG-OXC multi-granularity on the blocking probability
is evaluated for 16 classes of service over a network based on the NSFNet topology. A mechanism of fairness in bandwidth capacity
is also added to the connection admission control to manage the blocking probabilities of all kind of bandwidth requirements.
Comprehensive computational simulation are carried out to compare eight distinct node architectures, showing that an adequate
combination of waveband and single-wavelength ports of the MG-OXCs and OXCs allow a more efficient operation of a WDM optical
network carrying multi-rate traffic. 相似文献
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The proposed multi-granular optical cross-connect (MG-OXC) architecture and heuristic algorithm significantly reduce the number of used ports and hence the cost of an existing network, and also help in reducing the blocking probability of dynamic connection requests. 相似文献
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多粒度建模技术己经成为当前分布式仿真技术、基于仿真的采办及动态数据驱动的应用仿真等众多先进仿真技术的理论和应用基础,因此开展多粒度建模的研究对于仿真技术的发展具有重要意义.多粒度建模方法是目前多粒度建模领域的重点研究内容.首先分析比较了三种典型的多粒度建模方法,提出适合复杂系统仿真应用的多粒度建模方法--动态聚合解聚法... 相似文献
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Marc De Leenheer Chris Develder Jens Buysse Piet Demeester 《Optical Switching and Networking》2009,6(2):88-98
Recent years have demonstrated the limited scalability of electronic switching to realize transport networks. In response, all-optical switching has been identified as a candidate solution to enable high-capacity networking in the future. One of the fundamental challenges is to efficiently support a wide range of traffic patterns, and thus emerges the need for equipment that is both practical and economical to construct and deploy. We have previously proposed the use of multi-granular optical cross-connects (MG-OXC), which support switching on both the wavelength and sub-wavelength level. To this end, the MG-OXCs are equipped with cheap, highly scalable slow switching fabrics, as well as a small number of expensive fast switching ports. The goal of this work is two-fold: first to demonstrate that a small number of fast switching ports suffices to support a wide range of traffic requirements, and second that multi-granular optical switching can offer cost-benefits on a network-wide scale. The first objective is studied through simulation analysis of a single switching node, and results indicate that a limited number of fast switching ports can significantly improve burst blocking performance over slow only switches. Furthermore, under certain circumstances, the MG-OXC can even approach the performance of a fast only switch design. Secondly, we introduce an Integer Linear Programming model for the total network installation cost, and our evaluation indicates that multi-granular optical switching can be a cost-effective solution on the network level, in comparison to slow only or fast only approaches. Furthermore, we can achieve reduced costs of individual OXC nodes, which allows us to minimize scalability problems corresponding to emerging fast switching fabrics. 相似文献