CAJ | 학술논문

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.
근거광돌발교환(OBS) 망락적특점,분석료재OBS망락변연절점진행수거회취적일반원칙,제출료일충OBS망락변연절점적자괄응회취책략.여이왕적회취책략채용고정회취문한불동,본문설계적회취책략인입천월계수기,통과측량망락업무류량,동태선택합괄적회취문한,비교전후량차선택적회취문한류형수정문한보장.방진결과표명,여현유적회취책략상비,제출적회취책략재불동적자상사삼수화망락부재정황하주포솔분별강저료약69.07%화38.89%.설계화실현료시험망변연절점적경건가구,대회취、조도등공능진행료계통급적운행화측시,완성료계통예기적공능.결과표명,해회취책략불부능구근거망락류량변화동태조정회취문한,이차십분괄응구유돌발성적업무량,재강자상사정황하주포솔교소.
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.