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将网络编码和光网络相结合可以有效解决光网络的 带宽资源利用率等问题。然而,在光网络中进行编码操作,又将增加光网的光域运算开销、 复杂度和缓存需求。为了减少光网络中网络编码的操作次数,本文提出一种基于图压缩的方 法优化光网络拓扑结构, 结合智能优化遗传算法(GA)实现组播最大速率的光组播最小编码节点,通过对光网络拓扑结 构中的一类特殊潜在编码节点 进行压缩处理,达到缩小算法搜索空间、排除大量非最优解的目的。仿真结果表明,通过本 文图压缩优化后的光网络拓扑结 构,可以使得现有的智能优化GA在求解光组播最小网络编码路由问题时效率更高,寻找到的 解更优。 相似文献
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光网络中基于组播树的静态业务疏导算法 总被引:2,自引:1,他引:1
为了减少波分复用(WDM)网络中波长资源消耗,将组播路由算法的思想运用于静态业务疏导的计算,通过建立业务疏导树来实现静态业务疏导.为了减少疏导树的数量,从而减少网络中波长资源的消耗,将节点间的业务请求分组归并,利用装包算法使业务分组的数量最少,并通过构建最小生成树实现传输路径共享.仿真结果表明,本文的算法可以有效地减少... 相似文献
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文章首先简要分析了基于SDH的自动交换光网络(ASON)中光组播的功能需求,然后讨论了在基于SDH的ASON环境下实现组播的几种业务建立模型,最后从功能框架、信令扩展和实现流程等方面对具体实现方案进行了探讨。 相似文献
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组播应用使光网络的带宽资源日趋紧张。网络编码具有提高带宽利用率、提升网络的吞吐量、改善网络负载均衡等优点。分析了网络编码的特点及其编码代价、传统路由面临的问题,讨论了将网络编码引入光组播,优化光组播路由、提高网络吞吐量和资源利用率的研究方法。 相似文献
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重点描述了在稀疏分光波分复用(WDM)网络中实现组播的协议流程问题,通过扩展RSVP和OSPF协议,设计出在稀疏分光WDM网络中组播森林的建立连接协议流程,并给出了状态机模型. 相似文献
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随着各种多播业务的不断出现,如何在网络的光层实现多播业务的可靠性传输已成为光网络研究中的一个热点问题,而多播保护算法是这一问题的核心.目前多播保护算法的研究都是在假设网络所有节点具有多播功能的条件下进行的,然而由于成本的限制,实际光网络往往是一个稀疏多播光网络,即网络中只有部分节点具有多播功能.针对这一问题,提出了一种基于虚拟源的动态多播保护算法.仿真结果表明:该算法不仅能在稀疏多播光网络中满足多播业务可靠传输的要求,还具有较高的网络资源的利用率和较低的时间复杂度. 相似文献
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In multidomain optical networks (MDONs) the emerging multimedia, multivendor applications–based scheduled traffic (ST) is periodic and repeated day by day. The traffic is heavy during the working hours and slack during the non‐office hours. This results in the scarcity of network resources during the working hours, leading to the increased blocking of requests, even though there remains relatively large underused capacity during the non‐office hours. To use the network resources uniformly and efficiently, the demands may be slided within or shifted along the time zones/windows. In this paper, we first propose a heuristic algorithm, time‐aware routing and wavelength assignment (TA‐RWA), which allocates resources without traffic balancing (TB) for the ST in MDON. Time‐aware routing and wavelength assignment policy is then used as a benchmark for comparison with the 3 different TB solutions (named as P1‐TB, P2‐TB, and P3‐TB), in which the network load is redistributed by rescheduling the intradomain and interdomain demands. We performed extensive simulation experiments in MATLAB environment and compared the proposed policies with the existing ordering policies. From the results, it can be inferred that the proposed TB policies outperform the TA‐RWA, and the existing strategies of the blocking probability, resource utilization ratio (RUR), and percentage of intradomain and interdomain connections established. The best performance is achieved using P3‐TB strategy, in which requests are slided within, and shifted, along different time windows. The strategy shows about 70% reduction in the percentage blocking probability with respect to the TA‐RWA and the existing strategies. 相似文献
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基于混合增添遗传算法的无源光网优化规划 总被引:1,自引:0,他引:1
本文首次设计的混合增添遗传算法对PON网络拓扑结构进行优化,以富士通FPX-1000的光网络系统为例进行了仿真实验,发现混合增添遗传算法运行10代后,最小费用就比增添算法的最小费用降低了23%,并且网络拓扑结构图中客户结点(ONUs)均匀分布于或聚集在光分支结点周围,簇网络结构具有很好的对称性。仿真结果表明混合增添遗传算法是有效的,它可使网络建设代价最小化,非常好地解决了PON规划问题。 相似文献
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Panchali Datta Choudhury Neha Agarwal Tanmay De 《International Journal of Communication Systems》2020,33(7)
We adopt a fragmentation reducing policy for spectrum assignment and incorporate it with multicast traffic grooming in EON. To reduce fragmentation, the spectrum is partitioned based on the clique partitioning approach and spectral slots are assigned to traffic demands depending on which partition they belong. Simulation results predict that the proposed approach has better spectrum slot utilization compared to the state‐of‐the‐art non‐partitioning approach and the proposed approach reduces fragmentation, and also has less blocking ratio compared to the state‐of‐the‐art partitioning approach. 相似文献
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波分复用(WDM)技术的开发和应用使得网络中的信息容量得到了极大的提高,而网络中业务信息的多样化则促进了多播技术的应用和发展。多播的出现使网络的节点结构、虚拟拓扑连接方式及路由和流量疏导算法变得更加复杂多样。为此对光网络中各种多播方式及节点结构并对现有的路由和波长分配算法进行了评述。在此基础上提出了对这类光网络中的信息流量进行疏导时应遵循的几个基本原则,目的是提高波长容量的利用率,减少网络中所用的波长和分插复用器(ADM)数,降低网络的成本和费用。 相似文献
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The article addresses a simulation-based optimization approach for allocation of ADMs in WDM optical networks with stochastic
dynamic traffic. Since ADMs are expensive, it is desirable that if each node in WDM optical networks can use a minimum number
of ADMs to achieve a near-ideal performance. In this article, first, the utilization statistics of ADMs are gathered by simulation.
Then, ADMs are allocated based on the utilization statistics. In this respect, a simple sorting mechanism is used. The distinguished
feature of the proposed approach is that it shows the way to allocate ADMs at the nodes of WDM optical networks with stochastic
dynamic traffic. The experimental results ensure that the proposed approach can solve the problem of allocating ADMs in practical
WDM optical networks considering stochastic dynamic traffic.
相似文献
Mrinal Kanti NaskarEmail: |