Hop-Based Burst-Cluster Transmission: Fairness Improvement in High-Performance OBS Networks
Hop-Based Burst-Cluster Transmission: Fairness Improvement in High-Performance OBS Networks
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DOI：
10.1364/jocn.3.000542
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发表时间：
2011-06
期刊：
影响因子：
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通讯作者：
T. Tachibana;B. O. Nassar;S. Kasahara
中科院分区：
文献类型：
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作者：
T. Tachibana;B. O. Nassar;S. Kasahara
为了提高高性能光突发交换网络在跳数方面的公平性，提出了一种基于跳数的突发簇传输方法。在该方法中，同时组装具有不同跳数的突发，并生成基于跳数的突发簇，使得簇内的突发按照从最小跳数到最大跳数的顺序排列。然后，将基于跳数的突发簇与多个控制分组一起发送。这里，在同一簇内，在跳数较大的突发之前发送跳数较小的突发。根据修改的处理算法处理控制分组，因此跳数大的突发在波长预留中比跳数小的突发有更多的机会。从而降低了多跳的突发丢失率，增加了少跳的突发丢失率，提高了公平性。此外，基于跳跃的突发簇传输还可以降低总体突发丢失率。通过仿真对14节点NSFnet和ARPA2的基于跳的突发簇传输的性能进行了评估。在数值例子中，我们比较了所提出的方法与传统突发传输的性能，并考察了业务量、控制分组的处理时间、光交换机的交换时间和波长数目的影响。仿真结果表明，该方法不仅提高了网络的公平性，而且降低了两个网络的整体突发丢失率。
In order to improve the fairness in terms of the number of hops for high-performance optical burst switching networks, we propose a method called hop-based burst-cluster transmission. In this method, bursts with different numbers of hops are assembled simultaneously, and a hop-based burst-cluster is generated so that the bursts within the cluster are arranged in order from the smallest to the largest number of hops. Then the hop-based burst-cluster is transmitted along with multiple control packets. Here, within the same cluster, a burst whose number of hops is small is transmitted before a burst whose number of hops is large. The control packets are processed according to the modified processing algorithm, and hence a burst whose number of hops is large has more chances in the wavelength reservation than a burst whose number of hops is small. As a result, the burst loss probability of many hops decreases and the burst loss probability of few hops increases, improving the fairness. In addition, hop-based burst-cluster transmission can also decrease the overall burst loss probability. We evaluate the performance of hop-based burst-cluster transmission for the 14-node NSFNET and ARPA2 with simulation. In numerical examples, we compare the performance of the proposed method with conventional burst transmission, and we investigate the impacts of the amount of traffic, the processing time of a control packet, the switching time of an optical switch, and the number of wavelengths. We show that the proposed method can not only improve the fairness but also decrease the overall burst loss probability in both the networks.