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以太无源光网的DBA算法应当高效、公平,并保证服务质量。分析了影响链路利用率的各种因素,提出避免DBA延时、消除时隙末损耗等4项提高链路利用率的原则。同时给出了针对性措施,比如分组交织,基于帧边界授权。遵循这些原则,链路效率能够超过96%。按照SLA带宽比例,面向用户授权带宽能够实现用户间公平。为保证服务质量,应当采取区分服务模型,实行闸门式优先级队列调度方式,选取适当长度的轮询周期。
The DBA algorithm of Ethernet Passive Optical Network should be efficient, fair and ensure the quality of service. The factors that affect the utilization of the link are analyzed, and the principle of avoiding the DBA delay and eliminating the terminal loss of the time slot is put forward. At the same time, given the targeted measures, such as packet interleaving, frame boundary based authorization. Following these guidelines, the link efficiency can exceed 96%. According to the proportion of SLA bandwidth, user-authorized bandwidth can achieve fairness between users. In order to ensure the quality of service, a service model should be differentiated, and the gate-priority queue scheduling should be adopted to select the appropriate length of polling cycle.