EPON最小空闲时间动态带宽分配算法

Idle-time minimized dynamic bandwidth allocation algorithms for EPON networks

为解决典型EPON动态带宽分配算法因在每个授权周期中信道上存在空闲时间而导致网络性能降低的问题,提出最小空闲时间带宽分配算法(ITM-1和ITM-2).为部分光网络单元提前分配一个额外的带宽请求时隙,可减小甚至完全消除每个授权周期中出现的空闲时间,提高信道利用率.仿真结果表明:该算法较已有算法可明显改善网络的平均分组传输时延、最大分组时延、平均分组丢失率和吞吐量等性能.

An idle-time minimized dynamic bandwidth allocation （DBA） algorithm （ ITM - 1 ） and its extension （ ITM - 2） were proposed to resolve the lower network performances caused by an idle time in each cycle of traditional DBA algorithms for ethernet passive optical networks （EPON）. The algorithms can reduce and even eliminate the idle time by granting a group of ONUs to send report messages in advance, while increasing the channel utilization ratio. Simulation results show that the proposed algorithms achieve a significant performance gain in average packet transmission delay, max packet delay, average packet loss rate and throughput comparing with previous algorithms.