基于EPON的配电通信网的动态带宽分配方案

摘要

Based on the characteristics of the Ethernet Passive Optical Network (EPON) and the requirements of smart distribution grid, a novel dynamic bandwidth allocation (DBA) scheme of EPON in distribution communication network is proposed. Using the high-order moving average model, the novel scheme predicts the amount of high-priority traffic arriving during the waiting period, so as to ensure the performance of high priority services and prevent the lower priority traffic from being delayed for multiple cycle times. After that, the Round-Robin scheduling algorithm, which balances the fairness and efficiency of bandwidth allocation, is applied to authorize the ONUs of high loads in advance. Simulation results show that the scheme proposed in this paper can improve the performance on average delay, increase the network throughput and decrease the rate of packet loss.%结合以太无源光网络( EPON)的技术特点及智能配电网对通信系统的需求,设计了一种可用于配电通信网的EPON带宽分配方案.利用高阶移动平均模型,对高优先级业务在等待时隙中额外收到的流量进行预测并分配授权带宽,保证了高优先级业务性能,杜绝了较低优先级业务分配的时隙被挤占的现象.采用Round-Robin调度算法对处于高负载下的ONU进行提前发送,显著提高了系统整体性能并兼顾了分配的公平性.理论分析和仿真结果表明,所提出的动态带宽分配方案能够显著提高业务延时性能,增加网络吞吐量,并降低网络丢包率.