Dynamic band allocation circuit, dynamic band allocation...

Details Dynamic band allocation circuit, dynamic band allocation... Dynamic band allocation circuit, dynamic band allocation...

2004-12-21

2008-10-07

Yao, Kwang B. (Department: 2616)

Multiplex communications

Data flow congestion prevention or control

Flow control of data transmission through a network

C370S468000

Reexamination Certificate

active

07433312

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 (targetj,k) which constitutes a target for allocated data size (allocatedj,k). 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 (idealj,k) is calculated by idealj,k=targetj,k−(α/(1−α))·excessj,k−1. Furthermore, an excess allocated data size (excessj,k) per one cycle is calculated by excessj,k=α·excessj,k−1+(1−α)·(allocatedj,k−targetj,k). If idealj,k<0, the condition that bandwidth allocation is not granted is used for bandwidth allocation.

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