共查询到17条相似文献,搜索用时 109 毫秒
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光突发交换(OBS)是兼顾光电路交换和光分组交换优点的一种折衷方案,是未来光互联网的一种实现形式。在我们即将组建的光突发交换试验网中,IP(因特网协议)数据在边缘节点被组装成突发包,需要使用数据卡和控制卡分别处理数据分组和控制分组。因此,对处理控制分组的控制卡电路的优化设计和实现进行了描述。 相似文献
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OBS网突发包竞争问题的解决方案 总被引:2,自引:0,他引:2
光突发交换(OBS)是近几年出现的一种很有前途的新型光交换技术。由突发包之问竞争所导致的数据丢失是光突发交换网络所面临的一个重要问题,它影响到光突发交换能否走向实用化。为此提出了一种用于解决突发包之间竞争钧综合方案,并对它的性能进行了仿真研究。仿真结果表明,该方案可以大幅度地降低OBS网络中的数据丢失事。 相似文献
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光突发交换(OBS)技术是构筑下一代光因特网的一种很有前途的交换技术。OBS网络中,突发由分组组装会聚得到,是OBS传输的基本单位,突发如何影响网络的性能是个很重要的问题。本文研究轻业务负载下,输入业务为自相似业务时,组装业务的相关性结构。理论分析和仿真结果都证明了此时组装业务的相关性结构保持不变。 相似文献
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光突发交换(Optcal Burst Switching.OBS)被认为是在下一代光网络中起到至关重要作用的一种交换技术。边缘节点处突发包的组装作为业务接入OBS网络的第一步,是OBS研究的关键课题之一。 该文重点阐述了几种常用的突发组装方案:基于突发长度组装方案、基于组装时间组装方案、混合组装方案及自适应组装方案,并分析了它们的性能和优缺点。最后指出综合考虑网络业务流量、边缘节点的处理速度和信道带宽等因素的更加有效的突发组装算法是重点研究的内容。 相似文献
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光突发交换与交换粒度介于光电路交换(即波长交换)和光分组交换之间的一种光交换模式,因为它克服了光电路交换和光分组交换的缺点,具有很大的技术优势,很有可能成为下一代互联网骨干网络的核心技术,真正实现光子互联网。本介绍光突发交换技术的基本原理,讨论了光突发交换的协议,突发封装和在IP骨干网中的应用等问题,并指出在这项技术得到应用之前需要解决的诸多课题。 相似文献
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光突发包交换关键技术概述 总被引:1,自引:0,他引:1
光突发包交换(OBS)技术是近年来出现的一种新型光交换技术,它结合了波长路由和光分组交换的优点,是一种未来一段时间内交换网络比较理想的过渡方案,为此介绍了OBS的基本原理,讨论了OBS中偏置时间的设置和交换信道的调度等关键技术,并就OBS的特点及仍需解决的问题作了总结。 相似文献
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Optical switching technology can be categorized into optical circuit switching (OCS), optical packet switching (OPS) and optical burst switching (OBS). OCS is suitable for large amounts of data transmission; however, the channel utilization is inefficient when the traffic flows are intermittent. OPS can be easily adapted to any higher layer and is suitable for bursty traffic, but it requires a highly complex technology and optical buffer. The new switching paradigm, OBS, can provide higher bandwidth utilization and meanwhile avoid the complexity in OPS technology.In this paper, we investigate how the quality of service (QoS) can be guaranteed and reliable transmission can be supported in the OBS-based Internet backbone. We propose the adjustable-time-counter-based (ATCB) burst assembly and the non-real time packet retransmission mechanisms and apply them in the ingress router of the OBS Internet backbone to guarantee the quality of real time applications and lossless requirement of non-real time services. Moreover, traffic shaped is performed for real time packets in the egress router so that the real time property is preserved with a low jitter. Simulation results show that the burst blocking probability using the ATCB burst assembly is improved, compared with the time-counter-based (TCB) and burst-length-threshold-based (BLTB) mechanisms. The delay, loss and jitter of real time service conform to the QoS requirement. Meanwhile, the delay of non-real time service also falls in the acceptable range. 相似文献
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Hybrid offset‐time and burst assembly algorithm (H‐OTBA) for delay sensitive applications over optical burst switching networks
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Abdulsalam A. Yayah Yahaya Coulibaly Abdul Samad Ismail George Rouskas 《International Journal of Communication Systems》2016,29(2):251-261
Optical burst switching (OBS) is the most favourable switching paradigm for future all‐optical networks. Burst assembly is the first process in OBS and it consists of aggregating clients packets into bursts. Assembled bursts wait for an offset time before being transmitted to their intended destinations. Offset time is used to allow burst control packet reserve required resources prior to burst arrival. Burst assembly process and offset‐time create extra delay in OBS networks. To make OBS suitable for real time applications, this extra latency needs to be controlled. This paper proposes and evaluates a novel offset time and burst assembly scheme to address this issue. Constant bit rate (CBR) traffic that has stringent end‐to‐end delay QoS requirements is used in this study. The proposed scheme is called hybrid offset‐time and burst assembly algorithm (H‐OTBA). The objective of the paper is achieved by controlling maximum burst transfer delay parameters of CBR. The proposed scheme was evaluated via network simulation. Simulation results demonstrate that, H‐OTBA has effectively reduced end‐to‐end delay for CBR traffic compared with current solutions. Copyright © 2014 John Wiley & Sons, Ltd. 相似文献