共查询到18条相似文献,搜索用时 203 毫秒
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多域光网络的生存性作为衡量网络性能优劣的关键指标,与实际网络应用的关系最为密切,是当前迫切需要解决的关键问题;聚焦高速化、多业务化驱动的多域光网络环境下的生存性技术.基于光网络的多业务、分布式控制的特性,分析了多域光网络生存性机制的研究现状及面临的挑战;给出了一种针对多域光网络生存性问题的分类方法;结合多域光网络对生存性的需求,对相关关键技术进行了归类和研究,并指明了进一步研究的方向和重点. 相似文献
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智能光网络的多层生存性技术 总被引:2,自引:0,他引:2
文章对多层网络生存性问题、独立的网络生存性配置方案和多层网络生存性配置方案进行了概括和分析,对基于IP,GMPLS/Optical智能光网络多层结构的调整策略进行了研究,并讨论了基于智能光网络的统一控制平面、利用层间信令协调机制的集成多层网络生存性方案。 相似文献
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Hamza Drid Samer Lahoud Bernard Cousin Miklós Molnár 《Photonic Network Communications》2010,19(1):81-89
Survivability is becoming an important issue in optical networks due to the huge bandwidth offered by optical technology.
Many works have studied network survivability. The majority of these works are destined for single-domain networks. In this
work, we address the survivability of multi-domain optical networks. This paper provides a classification of the existing
protection solutions proposed for multi-domain networks and analyses their advantages and limitations. We propose a new solution
for multi-domain optical networks based on p-cycles (pre-configured cycles). For scalability and security reasons, we also
propose a topology aggregation model adapted to p-cycle computations. This aggregation model allows our proposed solution
to find a trade-off between two competing goals: efficient use of backup resources and short running time. Simulation results
show that the proposed solution is a good trade-off between resource utilization and running time compared to existing solutions. 相似文献
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Lei Guo Jingjing Wu Weigang Hou Yejun Liu Lincong Zhang Hongming Li 《Optical Fiber Technology》2011,(6):523-535
With the network size increasing, the optical backbone is divided into multiple domains and each domain has its own network operator and management policy. At the same time, the failures in optical network may lead to a huge data loss since each wavelength carries a lot of traffic. Therefore, the survivability in multi-domain optical network is very important. However, existing survivable algorithms can achieve only the unilateral optimization for profit of either users or network operators. Then, they cannot well find the double-win optimal solution with considering economic factors for both users and network operators. Thus, in this paper we develop the multi-domain network model with involving multiple Quality of Service (QoS) parameters. After presenting the link evaluation approach based on fuzzy mathematics, we propose the game model to find the optimal solution to maximize the user’s utility, the network operator’s utility, and the joint utility of user and network operator. Since the problem of finding double-win optimal solution is NP-complete, we propose two new hybrid protection algorithms, Intra-domain Sub-path Protection (ISP) algorithm and Inter-domain End-to-end Protection (IEP) algorithm. In ISP and IEP, the hybrid protection means that the intelligent algorithm based on Bacterial Colony Optimization (BCO) and the heuristic algorithm are used to solve the survivability in intra-domain routing and inter-domain routing, respectively. Simulation results show that ISP and IEP have the similar comprehensive utility. In addition, ISP has better resource utilization efficiency, lower blocking probability, and higher network operator’s utility, while IEP has better user’s utility. 相似文献
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Lei Guo Xingwei Wang Ying Li Chongshan Wang Hongming Li Hongpeng Wang Xin Liu 《Optical Fiber Technology》2009,15(2):192-196
In multi-domain wavelength-division-multiplexing (WDM) optical networks, the inter-domain routing is a challenge since each single-domain cannot view the full network topology. At the same time, survivability is also an important issue in optical networks since the failures of fiber links or network nodes may lead to a lot of traffic being blocked. In this paper, we study the survivability in multi-domain WDM optical networks, and propose a new survivable mechanism called load balanced domain-by-domain routing (LBDDR). In LBDDR, in order to obtain the efficient inter-domain survivable routes, we present the domain-by-domain routing (DDR) method which can find the intra-domain sub-working path and sub-backup path in each single-domain to form the inter-domain working path and backup path for each demand. In order to reduce the blocking probability, we present the load balanced routing method which can encourage the traffic to be uniformly distributed on the links with more free wavelengths. Simulation results show that, compared with conventional mechanism, LBDDR can obtain better performances. 相似文献
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针对大规模多层多域光网络群故障发生时的网络受损情况,提出基于路径计算单元(PCE)架构的跨域路由算法进行快速恢复,并基于OMNet平台对多层多域路由方案进行了性能仿真分析。结果表明,基于PCE架构的路由策略在群故障发生时能够大大减少网络中的路径计算请求泛洪信息,降低路由计算收敛时间,可以提高全网剩余资源的资源利用率,为业务的快速恢复提供了路由基础。 相似文献
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为了提高光网络信息多域云访问和调度能力,提出基于角色等级树的光网络信息多域云访问控制方法。构建光网络信息多域云访的分布式存储结构模型,结合特征重建重组方法进行光网络信息多域云数据的结构重组,在高维特征空间中提取光网络信息多域云数据的关联规则性特征量,采用模糊相关性融合方法进行光网络信息多域云数据信息融合和特征调度,结合谱分析方法进行光网络信息多域云访问和信息检索,采用角色等级树进行光网络信息多域云访问过程中的分类控制,提高光网络信息多域云数据的访问和调度能力。仿真结果表明,采用该方法进行光网络信息多域云访问控制的特征分辨力较强,准确性较好,数据访问的查准性较好。 相似文献
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With the large-scale deployment of optical network equipments, the problems of separated domains management and the multi-domain-based survivability have become the primary challenge in new generation intelligent optical networks. Aimed at resisting multi-link failures in multi-domain optical networks (MDON), a heuristic multi-link fault-tolerant (MLFT) algorithm for survivability in MDON is proposed in this article, which applied Hamiltonian cycle protection and segment-shared protection to establish a novel survivability strategy for either intra-domain??s or inter-domain??s multiple links, respectively. Furthermore, a new virtual-link mapping scheme and link-cost formulas are presented to encourage the appropriate routing selection and load balancing, which can also contributed to better resource utilization ratio and blocking ratio. Simulation results show that MLFT realizes the multi-link fault-tolerant survivability at a lower cost with better performances in redundancy ratio, blocking ratio, and computation complexity. 相似文献
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区分可靠性的通路保护方案既能为光网络中具有不同可靠性需求的业务提供有效的故障保护,又能优化网络资源的利用,是一种高效的生存性机制。但目前此类问题的研究主要是集中于传统的单域光网络中,所得的研究成果无法直接运用于具有多域特点的下一代光网络中。针对这一问题,在对以往通路保护算法进行改进的基础上提出了一种适用于多域光网络中的支持区分可靠性的通路保护算法,并对其性能进行了计算机仿真研究。仿真结果表明,该算法不仅能满足多域光网络中不同业务的可靠性需求,而且能提高网络资源的利用率、降低业务连接的阻塞率。 相似文献