自适应门限的EPON动态带宽分配实现

Dynamic Bandwidth Allocation with Adaptive Threshold in EPON

EPON(Ethernet passive optical network)是解决宽带接入中瓶颈问题的关键技术.为了实现EPON中共享上行带宽的公平和有效分配,以及不同分类业务的QoS保证,提出了基于门限的动态带宽分配算法.该算法根据ONU(optical network unit)的带宽请求和门限值授权分配带宽,实现了3种基于反馈控制理论的自适应调整门限方法并分析了其优缺点.模拟实验结果表明,与其他算法相比,该算法能够减少平均包时延,提高网络吞吐量.

The Ethernet passive optical networks （EPON） are high-speed solutions to the bottleneck problem of the broadband access network. To provide efficient and fair utilization of the EPON upstream bandwidth and support QoS requirements of different traffic classes, a dynamic bandwidth allocation algorithm based on gate threshold is proposed. The algorithm decides the data-receiving rate of the ONU （optical network unit）, according to the ONU data-sending response rate and the gate threshold. It then, implements three methods to adapt and adjust the gate threshold, and analyzes these methods＇ characteristic. Simulation experiments show the algorithm can decrease average packet delay and increase network throughput.