The Ethemet passive optical network （EPON） is the next generation of broad-band network technique. A crucial issue in EPONs is the sharing of uplink bandwidth among optical network units （ONUs）. This article provi...The Ethemet passive optical network （EPON） is the next generation of broad-band network technique. A crucial issue in EPONs is the sharing of uplink bandwidth among optical network units （ONUs）. This article provides a novel dynamic bandwidth allocation algorithm, i.e. threshold dynamic bandwidth allocation （TDBA）, which is based on adaptive threshold, to increase resource utilization. The algorithm uses ONU data-transmitting rate to adjust optical line terminal （OLT） receiving data threshold from an ONU. Simulation results show that this algorithm can decrease average packet delay and increase network throughput in a l 0G EPON system.展开更多
针对以往以太网无源光网络(EPON)动态带宽算法中存在的带宽分配不公平性问题,提出了基于带宽借贷机制的动态带宽算法 LLR 和 LWR,其基本思想为当某光网络单元(ONU)有空余带宽时,光线路终端(OLT)将此 ONU 多余带宽借贷给重负载 ONU,当债...针对以往以太网无源光网络(EPON)动态带宽算法中存在的带宽分配不公平性问题,提出了基于带宽借贷机制的动态带宽算法 LLR 和 LWR,其基本思想为当某光网络单元(ONU)有空余带宽时,光线路终端(OLT)将此 ONU 多余带宽借贷给重负载 ONU,当债权 ONU 遇到带宽不足的情况时,OLT 将会安排负债 ONU 偿还其未满足请求部分带宽。通过在正常使用和存在'贪婪'用户的两种情况下的仿真,分析了这两种算法的平均时延和丢包率特性。仿真结果表明这两种算法能为正常使用用户提供有保障的公平性服务,消除了以往算法在若干用户过量使用的情况下所有用户都受影响的问题,使动态带宽分配更加公平。展开更多
文摘The Ethemet passive optical network （EPON） is the next generation of broad-band network technique. A crucial issue in EPONs is the sharing of uplink bandwidth among optical network units （ONUs）. This article provides a novel dynamic bandwidth allocation algorithm, i.e. threshold dynamic bandwidth allocation （TDBA）, which is based on adaptive threshold, to increase resource utilization. The algorithm uses ONU data-transmitting rate to adjust optical line terminal （OLT） receiving data threshold from an ONU. Simulation results show that this algorithm can decrease average packet delay and increase network throughput in a l 0G EPON system.
文摘针对以往以太网无源光网络(EPON)动态带宽算法中存在的带宽分配不公平性问题,提出了基于带宽借贷机制的动态带宽算法 LLR 和 LWR,其基本思想为当某光网络单元(ONU)有空余带宽时,光线路终端(OLT)将此 ONU 多余带宽借贷给重负载 ONU,当债权 ONU 遇到带宽不足的情况时,OLT 将会安排负债 ONU 偿还其未满足请求部分带宽。通过在正常使用和存在'贪婪'用户的两种情况下的仿真,分析了这两种算法的平均时延和丢包率特性。仿真结果表明这两种算法能为正常使用用户提供有保障的公平性服务,消除了以往算法在若干用户过量使用的情况下所有用户都受影响的问题,使动态带宽分配更加公平。
