共查询到19条相似文献,搜索用时 109 毫秒
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数据信道调度是OBS核心路由器的关键技术之一,文章对数据信道的几种调度算法进行了分析.在此基础上,介绍了一种改进的波长调度算法.网络仿真结果表明,该算法可以有效改善网络性能. 相似文献
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光突发交换(OBS)网络中数据信道的调度算法是提高OBS网络性能的关键技术之一.文章给出了LAUC、LAUC-VF、BR和LAUC-VF-BS等几种数据信道调度算法的基本原理,通过仿真对这些调度算法进行了性能比较,结果表明LAUC-VF-BS算法能够更有效地降低突发丢失率,提高信道利用率,从而改善网络性能. 相似文献
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OBS网络中的最小间隙组调度算法 总被引:1,自引:1,他引:0
根据OBS网络的结构和特点,分析了OBS网络核心节点的数据信道调度算法,提出了一种新的数据信道调度算法--最小间隙组调度(SGGS)算法,并详细讨论了该算法的具体实现.该算法将到达核心节点的控制包分组,然后将这一组控制包按数据包到达先后的次序调度数据信道,从而达到合理调度和使用数据信道,最终实现改善整个OBS网络性能的目的. 相似文献
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简单介绍了两类基于LAUC的OBS数据信道调度算法-重新调度算法和成组调度算法,分析了其优缺点.分析了在LAUC机制下产生不合理调度的原因,并在此基础上提出了一种新的改进的数据信道调度算法,可以在付出相对较小代价的情况下减少丢包率,提高信道利用率,使信道调度趋于合理. 相似文献
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数据信道调度是OBS核心路由器的关键技术之一。介绍几种OBS核心路由器数据信道调度算法,并比较了它们的突发丢失率性能。 相似文献
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OBS网络中的主动拥塞控制策略研究及性能分析 总被引:1,自引:0,他引:1
根据光突发交换(Optical Burst Switching--OBS)网络的结构和特点,分析了其核心节点在数据信道调度发生拥塞时拥塞控制策略的缺陷,提出了OBS网络中一种主动拥塞控制策略(ACC),详细讨论了该策略的具体实现过程.通过仿真验证,在OBS网络中采用该算法能减少突发数据包的丢包率,从而达到改善整个OBS网络性能的目的. 相似文献
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Saravut Charcranoon Tarek S. El-Bawab Jong-Dug Shin Hakki C. Cankaya 《Photonic Network Communications》2006,11(1):99-110
We propose a new burst scheduling mechanism for Optical Burst-Switched (OBS) networks. The new approach is made possible by
gathering data bursts into groups and performing the scheduling decision for each group collectively. In OBS group-scheduling,
bursts will not be considered for scheduling until a pre-defined time period elapses, during which the group of burst header
packets would be gathered. By transforming a set of data bursts into a set of corresponding time intervals, the problem of
scheduling these bursts is transformed into a combinatorial optimization problem. Graph algorithms are applied to obtain the
maximum number of non-overlapping bursts. The proposed OBS group-scheduling scheme is shown to improve the performance of
OBS networks over existing scheduling schemes in terms of burst loss probability and channel utilization. With an extension
through a sequential optimization, using a Branch-and-Bound technique, the proposed scheme can support multiple classes of
service. It is shown that the new scheduling approach has several desired characteristics including fairness and service differentiability
among classes in terms of burst loss probability and channel utilization. 相似文献
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Control architecture in optical burst-switched WDM networks 总被引:27,自引:0,他引:27
Yijun Xiong Vandenhoute M. Cankaya H.C. 《Selected Areas in Communications, IEEE Journal on》2000,18(10):1838-1851
Optical burst switching (OBS) is a promising solution for building terabit optical routers and realizing IP over WDM. In this paper, we describe the basic concept of OBS and present a general architecture of optical core routers and electronic edge routers in the OBS network. The key design issues related to the OBS are also discussed, namely, burst assembly (burstification), channel scheduling, burst offset-time management, and some dimensioning rules. A nonperiodic time-interval burst assembly mechanism is described. A class of data channel scheduling algorithms with void filling is proposed for optical routers using a fiber delay line buffer. The LAUC-VF (latest available unused channel with void filling) channel scheduling algorithm is studied in detail. Initial results on the burst traffic characteristics and on the performance of optical routers in the OBS network with self-similar traffic as inputs are reported in the paper. 相似文献