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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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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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Existing performance studies on optical burst switched (OBS) networks have been focusing on channel blocking, i.e., when the required wavelength is not available on a link along a burst’s route. However, we identify another type of
blocking as the receiver blocking, i.e., when the receiver at a burst’s destination node is occupied by another burst. Receiver blocking may account for the
much larger part of total burst blocking. Receiver blocking has been largely ignored in existing research. In this paper we propose using multiple receivers or fiber delay lines (FDL)
in front of the receivers in order to reduce the receiver blocking probability. Extensive simulation results on bi-directional
OBS rings are presented to illustrate the problem and the performance of our proposed approaches. The results indicate that
receiver blocking can be almost eliminated by using as little as three receivers and can be reduced by using a FDL of small
length. To our knowledge, this is the first performance study that covers both channel and receiver blocking for OBS networks. 相似文献
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This paper proposes a dynamic burst discarding scheme for deflection routing in optical burst switching networks. In general, deflection routing is effective in lightly loaded situations, whereas it has a contrary effect in congested networks because deflected bursts accelerate network congestion. Thus deflection routing should be employed in lightly loaded networks. Incoming traffic, however, varies in time and location, so that temporal and/or local congestion cannot be avoided. Our proposed scheme resolves this problem in the following way. Each node autonomously detects congestion with local information, and bursts to be deflected are discarded in a probabilistic manner, based on the degree of detected congestion and the numbers of elapsed and remaining hops of those bursts. Simulation experiments show that when congestion happens temporarily, the proposed scheme reduces the burst loss probability, and it utilizes network resources efficiently when local congestion happens. 相似文献
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In this paper, a routing algorithm to optimize the selection of the best path for the transmitted data within the Internet of Things (IoT) system is proposed. The algorithm controls the use of ant colony ideas in the IoT system to obtain the best routing benefit. It divides the IoT environment into categorized areas depending on network types. Then, it applies the most suitable ant colony algorithm to the concerned network within each area. Furthermore, the algorithm considers routing problem in intersected areas that may arise in case of IoT system. Finally, Network Simulator 2 is used to evaluate the proposed algorithm performance. Simulation results demonstrate the effectiveness of the proposed routing algorithm in terms of end‐to‐end delay, packet loss ratio, bandwidth consumption, throughput, overhead of control bits, and energy consumption ratio. Copyright © 2016 John Wiley & Sons, Ltd. 相似文献
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《Digital Communications & Networks》2018,4(1):3-12
The issue of burst losses imposes a constraint on the development of Optical Burst Switching (OBS) networks. Heavy burst losses strongly affect the Quality of Service (QoS) intended by end users. This article presents a QoS aware Routing and Wavelength Allocation (RWA) technique for burst switching in OBS networks. The RWA problem is modeled as a bi-objective Integer Linear Programming (ILP) problem, where objective functions are based on minimizing the number of wavelengths used and the number of hops traversed to fulfill the burst transmission requests for a given set of node pairs. The ILP model is solved using a novel approach based on a Differential Evolution (DE) algorithm. Analytical results show that the DE algorithm provides a better performance compared to shortest path routing, which is a widely accepted routing strategy for OBS networks. 相似文献
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Hoang‐Linh To Suk‐Hwan Lee Won‐Joo Hwang 《International Journal of Communication Systems》2015,28(11):1729-1740
We consider optical delay line buffer as a solution to reduce the number of lost burst in optical burst switching, one of the promising candidates for future networks. Such network takes burst loss as an important performance criteria in the design step. Network performance, however, cannot be captured efficiently using traditional queueing models, because they often ignore the impatience of messages traveling through optical switches which is one of the popular issues in communication networks. In this paper, we develop an analytic model for this system using queueing theory and considering special impatience features. Simulation results show that (i) the developed model with impatience features can decrease burst loss probability ( ? 10%) compared with other approaches, and (ii) applying that model, we demonstrate that shared buffer architecture in optical burst switching network with optical buffer often achieves lower burst loss probability than dedicated buffer way in several different scenarios. Copyright © 2014 John Wiley & Sons, Ltd. 相似文献
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In this article we describe a feedback-based OBS network architecture in which core nodes send messages to source nodes requesting
them to reduce their transmission rate on congested links. Within this framework, we introduce a new congestion control mechanism
called congestion control with explicit reduction request (CCERQ). Through feedback signals, CCERQ proactively attempts to
prevent the network from entering the congestion state. Basic building blocks and performance tradeoffs of CCERQ are the main
focus of this article.
相似文献
Farid FarahmandEmail: |
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Chrisoula Papazoglou Panagiotis G. Sarigiannidis Georgios I. Papadimitriou Andreas S. Pomportsis 《International Journal of Communication Systems》2010,23(2):187-203
In an optical burst switched network, variable‐sized data bursts are switched on the fly using bandwidth previously reserved by their control packets. A key problem in OBS networks is the assignment of wavelengths to incoming bursts, that is, the scheduling of bursts. This paper proposes a new class of burst scheduling algorithms based on a triangular estimator. The proposed tool reduces the complexity of the scheduling scheme (measured in channel checks) without compromising its performance (measured by the burst drop ratio). Simulation results demonstrate both the accuracy and the efficiency of the estimator in a variety of scenarios and under self‐similar network traffic. Copyright © 2009 John Wiley & Sons, Ltd. 相似文献
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Nuno M. Garcia Paulo P. Monteiro Mrio M. Freire Jos R. Santos Przemyslaw Lenkiewicz 《Optical Switching and Networking》2007,4(3-4):173-188
The new architectural approach to Optical Burst Switching networks presented here features a common control channel and a node locally maintained network model. The Common Control Channel allows for a fast and efficient broadcast of the network Control Packets, which in turn are used by every node to update its Local Network Model. The Local Network Model allows efficient network resource planning as each node is aware of the reservation status intentions for the resources on each node. This paper describes the new C3-OBS architecture, evaluates its comparative performance to regular OBS, assesses the manageable bandwidth for a C3-OBS network and evaluates the common control channel manageable load. The concept of “Well-Informed Node” is defined as a metric of trustfulness on the information managed by the Local Network Model and the scope and application of C3-OBS networks are studied. 相似文献