共查询到19条相似文献,搜索用时 78 毫秒
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一种稀疏分光配置约束下的WDM网络多播RWA算法 总被引:1,自引:0,他引:1
在波长路由WDM网络中,波长路由和波长分配是RWA算法提高光网络阻塞性能的两个重要阶段和关键技术。文章针对现有的稀疏分光配置约束下的光网络多播RWA算法复杂度高、代价高的问题,提出了一种新的稀疏分光器配置的RWA多播算法。该算法摒弃传统RWA算法在波长路由阶段就考虑稀疏分光约束能力的惯性思维,论文首次提出在波长分配阶段,才通过多播长转换器实现满足稀疏分光约束条件的分光能力传递。仿真结果表明,所提算法在平均代价和所需波长数目方面都获得了较优的性能。 相似文献
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针对WDM光网络多播动态路由分配问题,提出了一种多约束条件下的路由分配算法.对WDM光网络中的多约束因素进行了系统分析,阐述了算法的实现步骤,并对CERNET和NSFNET两种网络进行了仿真实验和对比. 相似文献
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针对节点功能不同光网络中的路由与波长分配问题,建立了一种具有节点功能区分的波分复用器(WDM)多波长光网络模型,根据节点功能将其分为A,B两类,并提出了波长等价弧、等价网络,以及等价多播树等概念.在此基础上基于节点功能区分的WDM光网络的特点和相应的路由和波长分配策略,提出了一种如何在此类WDM光网络中实现多播连接的快速有效的算法,分析了算法计算复杂度,指出了算法的优缺点. 相似文献
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提出了一个改进的稀疏分光器配置约束下的改进算法。在稀疏分光器配置约束下,多播路由不再是图论中”树”的形状,多播路由可能存在逻辑圈。现有的多播路由算法没有考虑这个特点,改进对此算法作了一下改进,通过仿真证明改进算法提高了网络性能。 相似文献
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提出了一个改进的稀疏分光器配置约束下的改进算法。在稀疏分光器配置约柬下,多播路由不再是图论中“树”的形状,多播路由可能存在逻辑圈。现有的多播路由算法没有考虑这个特点,对此算法作了一下改进,通过仿真证明改进算法提高了网络性能。 相似文献
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基于节点功能的WDM光网络分布式路由与波长分配算法 总被引:2,自引:0,他引:2
建立了一种具有节点功能区分的WDM多波长光网络模型,根据节点功能将其分为A、B两类,在此基础上提出了波长等价弧和等价网络等概念,并根据此类多波长光网络模型的节点和网络结构特点以及相应的选路和波长分配策略,提出了一种基于节点功能的多波长光网络分布式路由与波长分配算法——BONF算法,证明了算法的可行性,分析了算法的计算复杂度,比较了此算法与其它同类型算法的区别,指出了BONF算法的优点和不足。 相似文献
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Jianping Wang Junling Yuan Xianwei Zhou Xiaosong Yu 《Photonic Network Communications》2010,19(2):134-143
With the increasing requirement for communication bandwidth, all-optical network has been more and more important owning to
its large traffic capability. Multicasting is an important technology in wavelength division multiplexing (WDM) optical network,
and has been studied in many works. In this paper, we consider the multicasting technology on all-optical metropolitan area
network (MAN) with maximum power attenuation constraint. The objective is to minimize total cost of a multicasting request.
This problem is NP-hard. We propose a heuristic, named Power-Constraint Fix-Destination-Path (PC-FDP) algorithm, to solve
this maximal power-loss constrained minimizing cost multicasting problem. It means that, during the process of building a
multicasting tree, when a destination is reached and its power satisfies the constraint, the path from source to it would
be fixed in the tree. Simulation results show that, all multicasting trees building the proposed algorithm satisfy the power
constraint, with slight increasing of the total cost. 相似文献
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The advances in wavelength-division multiplexing (WDM) technology are expected to facilitate bandwidth-intensive multicast
applications through light splitting. Due to complexity and cost constraints, light splitting (or optical multicast) nodes
are sparsely configured in a practical WDM network. In this article, we investigate the multicast routing problem under the
sparse light-splitting constraint. An efficient sparse splitting constrained multicast routing algorithm called Multicast
Capable Node First Heuristic (MCNFH) is proposed. The key idea of MCNFH is to include the shortest path, that includes most
of the multicast capable nodes, for configuring the multicast tree. Simulations and comparisons are used to demonstrate the
performance of MCNFH. Simulation results and analysis show that MCNFH builds multicast trees with the least wavelength channel
cost and with the smallest number of wavelengths used per link. In addition, MCNFH requires only one transmitter at the source
node. 相似文献
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In Next Generation Networks (NGN), survivability and availability are becoming more and more key features. Reliability gains
more importance in high- capacity networks where IP and optical technologies have converged toward a common control plane,
such as GMPLS. In most previous research works, survivability aspects were mainly limited to a single fiber failure and a
few considered the differentiated reliability concepts when routing new connection requests. In this article, a novel survivable
multicast routing mechanism under SRLG constraints is proposed. We first formulate the problem as an Integer Linear Programming
(ILP) model that is shown NP-Complete. We then propose a heuristic algorithm that alleviates the problem’s complexity by decomposing
it into two sub-problems resolved separately. Compared with another algorithm proposed in the literature, our algorithm allows
for higher acceptance rates even for stringent reliability requirements. 相似文献
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WDM光网络中光层组播技术的研究 总被引:1,自引:0,他引:1
本文分析了光层组播原理。在物理层实现组播 ,使该技术在整个互联网实施实时交互音像通信和有效抑止“电子瓶颈”效应有着重大作用。文中对两种不同结构具有光层组播的OXC进行了分析比较。并且对WDM光网络中的无阻塞组播通信波长满足条件进行了分析探讨。 相似文献
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