基于效用值的无源光网络节点缓存数据调度  

Data scheduling in passive optical network nodes based on utility value

作　　者：伊小素[1] 初阳 曾华菘 何春吟 YI Xiaosu;CHU Yang;ZENG Huasong;HE Chunyin(School of Instrument Science and Optoelectronic Engineering,Institute of Optoelectronic Technology,Beijing University of Aeronautics and Astronautics,Beijing 100191,China)

机构地区：[1]北京航空航天大学仪器科学与光电工程学院光电技术研究所

出　　处：《激光杂志》2019年第11期93-99,共7页Laser Journal

摘　　要：为解决无源光网络离线式动态带宽分配(DBA)过程中存在的光网络单元(ONU)内部缓存数据不能被光线路终端(OLT)及时授权发送的问题,提出了一种将ONU缓存队列中的数据包依据时延要求和带宽需求为其定义效用值,并使各数据包按效用值大小重新排序并发送的调度机制。经仿真验证,此调度机制可使时延敏感业务的平均时延最大降低28%。同时验证了该调度机制对总链路负载率和业务流量比例的变化均不敏感。综上,该调度机制可配合无源光网络中DBA算法,对各类业务提供差异化的服务。In order to solve the problem that the internal cache data of the optical network unit(ONU)existing in the offline dynamic bandwidth allocation(DBA)process of the passive optical network cannot be granted and transmit-ted by the optical line terminal(OLT),an ONU buffer queue is proposed.A scheduling mechanism in which packets are defined based on latency requirements and bandwidth requirements,and each packet is reordered and sent by utility value.It is verified by simulation that this scheduling mechanism can reduce the average delay of delay sensitive serv-ices by up to 28%.At the same time,it is verified that the scheduling mechanism is not sensitive to changes in the total link load rate and service traffic ratio.In summary,the scheduling mechanism can cooperate with the DBA algorithm in the passive optical network to provide more effective guarantee for various service quality.

关 键 词：无源光网络 效用值 动态带宽分配 平均时延 

分 类 号：TN919[电子电信—通信与信息系统]