以太无源光网络动态带宽分配算法研究

Investigation of DBA in ethernet passive optical networks

动态带宽分配是以太无源光网络的重点研究领域之一,其中光网络单元(ONU)内的带宽分配影响到用户的服务质量。文中在分析已有算法的基础上,提出了一种用于 ONU 内带宽分配的改进令牌桶算法,即每个分配周期中累积的令牌数取决于 ONU 分配的带宽,而不是 ONU 的基本带宽.给出了该算法详细的代码描述,并通过在模拟流量下的仿真,证明了该算法能保证不同类型数据的优先顺序,并能保证各种负载条件下带宽分配的公平性,因此相对于已有算法有更好的适用性.

Dynamic bandwidth allocation(DBA)is among the main research fields of EPON(Ethemet Passive Optical Networks),and the intra-ONU DBA influences the QoS of end users.An improved token bucket algorithm (Improved TB)is proposed based on the former algorithms.The token size increased in each cycle depends on the bandwidth allocated for each ONU,instead of the static guaranteed bandwidth.Description in code is given and the simulation results using synthetic traffic confirm that Improved TB can guarantee the priority order of different traffics, and it can also guarantee the fairness of allocation compared with existing bandwidth allocation scheme.