共查询到18条相似文献,搜索用时 78 毫秒
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提出一种不等概率输出模型,该模型考虑到不同输出端口具有不同的服务率,赋予不同端口以不同的选择概率.最后,通过计算突发数据分组阻塞率详细分析了输出端口的服务率和选择概率之间的关系. 相似文献
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光突发交换(Optical Burst Switching,OBS)网络是下一代IP over WDM全光网络的发展趋势.文章主要研究并分析了OBS网络中配备有光缓存的核心路由器性能,给出了突发数据分组阻塞率、输出端口占用率、排队时延等性能参数.所得结果对0BS网络理论研究进行了一定的补充. 相似文献
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文章分析了偏射路由对网络性能的影响,在分析发送端控制偏射路由技术的基础上,提出了基于阈值检测和数据更新的改进方案.边缘节点快速更新状态信息,并通过特殊控制分组传递链路拥塞的分布特征等信息;交换节点进行阈值检测,动态决定竞争时突发的传送方式,减少偏射路由对网络负荷的影响,进一步降低网络阻塞率,改善网络性能。 相似文献
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光突发交换(OBS)网络是迈向全光分组交换网络的典型代表.文章主要研究了基于可变长光突发数据分组的OBS网络性能,给出并分析了不同负荷量大小的情况下网络中的平均突发数据分组数量等参数.在设定网络速率为10和40 Gbit/s的情况下,给出了网络平均时延、突发数据分组负荷量及突发数据分组长度之间的关系.所得结果可作为对OBS网络理论研究的一种补充. 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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光纤传输技术和光网络技术的发展使得光网络成为现代高速宽带网络的基础骨干网。光突发交换是一种介于光路交换和光分组交换之间的很有发展潜力的交换模式,它结合了两者的优势又克服了两者的缺点。重点阐述了光突发交换的概念和关键技术,并介绍了光突发交换目前的研究进展。 相似文献
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主要从硬件方面设计了一种满足GLOBS网络要求的OXC节点和边缘节点方案,并通过OPNET仿真验证了它们的功能. 相似文献
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RSVP is a bandwidth reservation protocol that allows distributed real-time applications such as videoconferencing software to make bandwidth reservations over packet-switched networks. Coupled with real-time scheduling mechanisms built into packet routers, the network guarantees to provide the reserved bandwidth throughout the lifetime of the applications. Although guaranteed services are of great value to both end users and carrier providers, their performance cost, due to additional control and data processing overhead, can potentially have a negative impact on the packet throughput and latency of RSVP-capable routers. The goal of this article is to examine the performance cost of RSVP based on measurements from an industrial-strength RSVP implementation on a commercial IP router. The focus is on the detailed evaluation of the performance implications of various architectural decisions in RSVP. We found that RSVP's control messages do not incur significant overhead in terms of processing delay and bandwidth consumption. However, the performance overhead of real-time packet scheduling is noticeable in the presence of a large number of real-time connections. In extreme cases, the performance guarantees of existing real-time connections may not be kept, and some best-effort packets are actually dropped, although the overall bandwidth requirement from these connections is smaller than the available link bandwidth 相似文献
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设计了基于业务优先级的光突发交换核心节点模型,采用多级光纤延迟线的光缓存来提高交换网络的性能.交换节点在4个端口8条波长(4×8核心交换结构)的情况下,当光纤延迟线基本延迟单元为50μs、级数为8,负载为0.8时,丢包率小于0.01;为了满足不同业务服务质量的要求,将数据包按优先级划分,采用基于优先级的插空算法(VFPP),在相同缓存配置条件下使高优先级数据的丢包率降低到以下,在高负载下平均时延小于不区分优先级的情况. 相似文献
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We compute analytically burst blocking probabilities in an OBS switch when limited-range wavelength conversion is employed.
Two separate queueing models are proposed and analyzed approximately; one for the case where the degree of conversion d is 1 or 2, another for large values of d. The arrival process of bursts is assumed to be an IDLE-ON process. The accuracy of these queueing models was tested against
simulation. We show numerically that in order to keep the burst blocking probability within an acceptable level, the utilization
of each wavelength has to be low. 相似文献
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《Digital Communications & Networks》2017,3(1):19-29
The energy consumption in the wireless sensor networks is a very critical issue which attracts immediate attention for the sake of the growing demand of the billion dollar market in future. The Dynamic Power Management (DPM) technique is a way of controlling and saving the energy usage in a sensor node. Previously, researchers have proposed lifetime improving stochastic models for wireless sensor networks and limited work has been done focusing on the wireless sensor node. This paper proposes an analyser based Semi-Markov model for DPM in the event-driven sensor node. The power consumption comparison with previously proposed models without this analyser shows the analyser significant contributes to lifetime improvement. The improved model is more power efficient, presents how the DPM model observes the input event arrival and power states of the sensor node components, and then dynamically manages the power consumption of the overall system. Further, to observe the effect of event arrival, missed events, waiting time, processor utilization on the power consumption and lifetime, the proposed DPM system with the single server queuing model is developed. 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,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