光突发交换中的一种自适应汇聚策略  

Adaptive assembly strategy for optical burst switching networks

作　　者：朱智俊[1] 乐孜纯[2] 

机构地区：[1]浙江工业大学信息工程学院,浙江杭州310014 [2]浙江工业大学理学院,浙江杭州310014

出　　处：《光学精密工程》2010年第1期248-256,共9页Optics and Precision Engineering

基　　金：浙江省自然科学基金资助项目(No.Y1080172)

摘　　要：根据光突发交换(OBS)网络的特点,分析了在OBS网络边缘节点进行数据汇聚的一般原则,提出了一种OBS网络边缘节点的自适应汇聚策略。与以往的汇聚策略采用固定汇聚门限不同,本文设计的汇聚策略引入穿越计数器,通过测量网络业务流量,动态选择合适的汇聚门限,比较前后两次选择的汇聚门限类型修正门限步长。仿真结果表明,与现有的汇聚策略相比,提出的汇聚策略在不同的自相似参数和网络负载情况下丢包率分别降低了约69.07%和38.89%。设计和实现了试验网边缘节点的硬件架构,对汇聚、调度等功能进行了系统级的运行和测试,完成了系统预期的功能。结果表明,该汇聚策略不仅能够根据网络流量变化动态调整汇聚门限,而且十分适应具有突发性的业务量,在强自相似情况下丢包率较小。In order to improve the assembly performance of Optical Burst Switching（OBS）networks,an adaptive assembly strategy for the edge node of OBS was presented in this paper.To be different from the traditional assembly strategy with a fixed threshold system,the proposed strategy measured the network traffic flow and chose a suitable assembly threshold dynamically by introducing a cross counter.Moreover,the step length of the assembly thresshold was modified by comparing the type of assembly threshold with the former one.Simulation results show that the strategy can reduce the burst loss probability by 69.07% and 38.89% as compared with the existing assembly strategy.The edge node hardware structure for a OBS testing bed was designed and realized,and the functions of assembly and schedule based on the hardware structure were tested,meanwhile,the prospective goal was achieved.Results show that the novel strategy not only can adjust the assembly threshold according to the traffic flow,but also can have lower burst loss probability under a strong self-similar case.

关 键 词：光突发交换 汇聚策略 自适应调整 自相似业务 ON/OFF源 

分 类 号：TN929.1[电子电信—通信与信息系统]