Dynamic band allocation circuit, dynamic band allocation method, dynamic band allocation program, and recording medium

Abstract

In a P2MP system in which upstream bandwidth is shared by a plurality of ONUs, a dynamic bandwidth allocation circuit is provided which reduces the consumption of memory capacity, and avoids the divergence of parameters. A dynamic bandwidth allocation circuit provided in an optical line terminal (OLT) calculates, for each cycle and for each ONU, a target data size (target) which constitutes a target for allocated data size (allocated). Furthermore, taking the time constant of an exponential weighted moving average as τ, and taking α=(τ−1)/(τ+1), an ideal allocated data size (ideal) is calculated by ideal=target−(α/(1−α))·excess. Furthermore, an excess allocated data size (excess) per one cycle is calculated by excess=α·excess+(1−α)·(allocated−target). If ideal<0, the condition that bandwidth allocation is not granted is used for bandwidth allocation.