EPON带宽分配算法设计原则研究  

Design Principle of EPON Uplink Dynamic Bandwidth Allocation Algorithm

作　　者：甘苹[1] 

机构地区：[1]复旦大学通信科学与工程系,上海200433

出　　处：《半导体光电》2008年第2期247-251,共5页Semiconductor Optoelectronics

摘　　要：在分析多种算法的基础上,对以太无源光网(EPON)动态带宽分配(DBA)算法的设计原则进行了总结。提出ONU分组交织、基于以太帧边界授权、采用较大的轮询周期等三项措施,来提升高信道利用率。提出采用两级结构的DBA为用户分别授权,在支持QoS的同时保障用户间的公平性。基于上述设计原则,提出了一种新算法——面向用户基于帧边界分配算法(SOABR),仿真实验证实其具有极高的信道利用率、良好的延时性能和公平性。In Ethernet passive optical networks （EPON）, the dynamic upstream bandwidth allocation scheme with QoS support is expected to be effective and fair. According to these requirements, design issues of Dynamic Bandwidth Allocation （DBA） are studied. To boot link efficiency, three methods are proposed, such that ONUs are divided into several sets to cancel idle stage of uplink; grant conforming to frame boundary of ONU＇s queues would avoid unused slot remainder. Hierarchically grant to priority traffic of each user corresponding to subscriber＇s SLA is suggested to guarantee inter-user fairness and meanwhile to support QoS. A new DBA named SOABR is designed to perform these principle. Simulation experiments show that SOABR can achieve an optimal bandwidth utilization, acceptable low packet delay for highest priority traffic and good fairness among users.

关 键 词：以太无源光网 动态带宽分配 QOS 公平性 信道利用率 

分 类 号：TN929.11[电子电信—通信与信息系统]