PERFORMANCE ANALYSIS OF OPTICAL BURST SWITCHED NETWORKS WITH LIMITED-RANGE WAVELENGTH CONVERSION, RETRANSMISSION AND BURST SEGMENTATION
PERFORMANCE ANALYSIS OF OPTICAL BURST SWITCHED NETWORKS WITH LIMITED-RANGE WAVELENGTH CONVERSION, RETRANSMISSION AND BURST SEGMENTATION
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DOI：
10.15807/jorsj.52.58
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发表时间：
2009-03
影响因子：
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通讯作者：
Tuan Phung-Duc;H. Masuyama;S. Kasahara;Yutaka Takahashi
中科院分区：
文献类型：
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作者：
Tuan Phung-Duc;H. Masuyama;S. Kasahara;Yutaka Takahashi
本文研究了具有突发分割、波长转换和上层重传的光突发交换网络的性能。当突发到达中间节点并发现其分配的波长被占用时，它会尝试在分配的波长可以转换为的有限波长中寻找另一个空闲波长。如果传入的突发在该范围内找不到空闲波长，则将分配波长内正在进行的突发进行分段，丢弃与传入突发重叠的尾部，并通过TCP等上层重传机制在稍后的时间作为重传突发重传。以波分复用下的出线光纤为研究对象，将其建模为无候诊室的多服务器重试排队系统，其中到达的客户以状态依赖的概率从一组服务器中选择自己的服务器。我们建立了一个二元马尔可夫链来分析模型，并进行了仿真实验来验证分析模型。数值算例表明，在低通信强度下，波长转换技术可以有效地减少突发间的争用，且争用程度对重传速率几乎不敏感。他们进一步揭示，即使是很小范围的波长转换也能显著缓解爆发之间的争论。
This paper considers the performance of optical burst switched networks with burst segmentation, wavelength conversion and upper-layer retransmission. When a burst arrives at an intermediate node and finds its allocated wavelength occupied, it attempts to find another idle wavelength among a limited number of wavelengths to which the allocated wavelength can be converted. If the incoming burst cannot find any idle wavelength in the range, the ongoing burst in the allocated wavelength is segmented and its tail part which overlaps with the incoming burst is dropped and retransmitted as a retransmitted burst in a later time by upper-layer retransmission mechanisms such as TCP. Focusing on an outgoing optical fiber shared under wavelength division multiplexing, we model it as a multi-server retrial queueing system without waiting room, in which an arriving customer chooses his server out of a group of servers with a state-dependent probability. We formulate a bivariate Markov chain to analyze the model and also perform simulation experiments to validate the analysis model. Numerical examples show that the wavelength conversion technique is effective to lessen the contention of bursts at low traffic intensity and that the degree of contention among bursts is almost insensitive to the retransmission rate. They further reveal that even a small range of wavelength conversion can significantly alleviate the contention among bursts.