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中文字数:5557,中文页数:7 英文字数:3448 页数:10 Abstract—We propose an Optical Line Terminal (OLT) centric Dynamic Bandwidth Allocation (DBA) scheme based on individual requests from service queues in Optical Network Units (ONUs) for a Quality-of-Service (QoS) aware Ethernet Passive Optical Network (EPON). The goal is to provide fairness for allocating bandwidth among different service classes based on their Service Level Agreements (SLAs). The proposed DBA scheme makes use of the excess bandwidth of lightly loaded queues to meet the bandwidth demand of heavily loaded queues. To implement this scheme, an effective polling mechanism is incorporated to solve the idle period problem. In addition, to reduce the scheduling overhead, the DBA scheme utilizes a novel different cycle policy which involves selective bandwidth allocations to different service classes based on their delay bounds. We conduct detailed simulation experiments and compare the results with the well-known Interleaved Polling with Adaptive Cycle Time (IPACT) algorithm that utilizes strict priority policy. 摘要：我们提出一种以光线路终端（ OLT ）为中心的动态带宽分配（ DBA ）方案来认识以太网无源光网络（ EPON ），该方案是基于光网络单元中服务队列的用户请求等级来保证服务质量（ QoS ）。我们以服务水平协议（ SLA ）来实现不同服务等级间提供公平的动态带宽分配。被提议的DBA方案的目的是利用轻负载队列的剩余带宽在重负载队列的带宽需求进行重新分配。为了实施这一方案，一个有效的轮询机制纳入解决闲置时间的问题。此外，为了减少调度开销，该DBA方案利用了一种不同的新型轮询的方案，它基于一定得时延范围内有选择性将带宽分配给不同的服务等级。我们进行精细的仿真实验，并将仿真结果与基于授权请求的自适应循环周期时间的交织轮询方案(IPACT)进行比较，得出采用严格的优先权策略。
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