支持突发接入模式EPON下行传输方案  

A downstream transmission scheme of optical burst switching in ethernet passive optical networks with burst access mode

作　　者：陈希[1] 范红[2] 

机构地区：[1]江苏城市职业学院信息工程系,南京210019 [2]南京邮电大学光电工程学院,南京210046

出　　处：《南京信息工程大学学报（自然科学版）》2012年第2期176-179,共4页Journal of Nanjing University of Information Science & Technology（Natural Science Edition）

基　　金：江苏省科技创新与成果转化(重大科技支撑与自主创新)专项引导资金项目(BY2010101)

摘　　要：分析了支持突发接入模式的EPON在下行传输中业务流特性的变化问题,提出了在下行传输时OLT向ONU分解转发帧的传输方案.通过对下行带宽资源实行基于优先级的调度,减少因数据帧到达的突发性对某些高优先级的数据帧的影响;利用滑动窗控制每个ONU的数据帧到达速率,解决大量数据帧到达造成ONU处理负荷过重的问题.利用OPNET Modeler仿真平台建立网络模型并进行仿真,验证了方案的可行性.The data flow characteristics in downstream transmission of Ethernet Passive Optical Network （EPON）,which is integrated with burst access mode,are analyzed in this paper,and a downstream transmission scheme based on optical burst switching is proposed hereby.The bursting arrival of data frames from Optical Line Terminal （OLT） will fully occupy the downlink bandwidth,thus delay the transmission of data frame with higher priority,and overload the Optical Network Unit （ONU）.The influences of burst arriving data frames on the transmission of higher-priority data frames can be reduced through scheduling the downlink bandwidth resources based on priority.The sliding windows are used to regulate the arrival rate of each ONU data frame to relieve the overload of ONU processing.The transmission scheme is simulated and evaluated on OPNET Modeler.The results verify the feasibility of the scheme.

关 键 词：以太无源光网络 光突发接入 下行传输 

分 类 号：TN913.7[电子电信—通信与信息系统]