基于效用的EPON VoD QoS组播实现机制研究  

Research on the Implement Mechanism of EPON VoD QoS Multicast Based on Utility

作　　者：张晋豫[1] 刘犁 杨维[1,3] 

机构地区：[1]北京交通大学计算机学院,北京100044 [2]新泽西理工学院计算机科学系 [3]东南大学移动通信国家重点实验室,南京210096

出　　处：《计算机学报》2010年第3期580-588,共9页Chinese Journal of Computers

基　　金：国家"八六三"高技术研究发展计划项目基金(2001AA122021);现代农业产业技术体系建设专项基金(KKFR09001531);东南大学移动通信国家重点实验室开放基金(W200816)资助~~

摘　　要：服务质量无法保证和低效益是IP网络上开展VoD业务面临的主要问题.基于组播业务的网络优先级、用户群的SLA优先级和经济优先级,提出了一个基于效用的EPON VoD组播QoS优先级(效用优先级)算法.在网络拥塞的时候,基于该效用优先级来动态调整组播组的资源分配,不但节省了带宽需求和降低包丢失率,而且可通过将网络资源汇聚到高价值的业务上,提高带宽的效益.通过对变长和无序EPON Ethernet下行帧进行基于效用的定长和有序的改进,可减少VoD业务流的包时延抖动.仿真实验结果很好地验证了该机制的优点.Non-guaranteed QoS and low benefit are essential problems when VoD runs in IP network.Based on network priority,mass SLA priority,as well as economic priority of multicast service of VoD in EPON,a QoS priority utility algorithm（utility priority）is introduced for multicast.When congestion is occurring,the network resources are re-allocated among multicast group according to their utility priority.This measure can not only reduce bandwidth requirement and packet loss,but also can increase bandwidths benefit by converging them on the higher value services.By turning disorderly and variable-length Ethernet frame into orderly and constant-length one,the delay jitter of VoD packet is reduced.The result of simulation well verifies its merits.

关 键 词：以太无源光网络 视频点播 服务质量 组播 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]