EPON的性能分析及优化

Optimize and analysis for performance of EPON

本文研究了以太无源光网络(EPON)的动态带宽算法,提出了基于轮询-呼叫方式的优化DBA算法。本文以合理地利用和分配带宽,确保系统得到QoS保证为目标,对上行通道剩余带宽的利用提出了相应的优化方法和调度机制,并进行了性能分析和比较。同时在研究了人们往往容易忽略的ONU的退出和启动基础上,进一步对EPON运行过程中ONU的接入和退出时带宽的利用进行了优化,并提出了解决方案。

The dynamic bandwidth arithmetic of the Ethernet Passive Optical Network （EPON） is studied, and the optimized Dynamic Bandwidth Allocation （DBA） arithmetic is proposed. The aim of this paper is to get QoS by utilizing and distributing bandwidth. Furthermore, correspondent method and dispatching mechanism for the utilization of up-stream passage surplus bandwidth are proposed, compared and analyzed. At the same time, based on researching the exit and start-up of the Optical Network Unit （ONU） which is often neglected, the utilization of bandwidth when the ONU accesses and exits in run process of EPON is optimized, and some solutions are discussed. Through performance simulation and analyses, the correctness and validity of the optimized arithmetic and dispatching mechanism are proved.