Mitsubishi Denki Kabushiki Kaisha

Ken Murakami

Masaki Tanaka

Hiroaki Mukai

Toshihiro Shikama

Michiya Takemoto

An allocation determining unit determines a bandwidth allocation for each of a plurality of subscriber devices in each data-collection cycle. A history managing unit takes a history of a request increment from a bandwidth request amount acquired from more than one time of data collections and an allocation amount allocated by the allocation determining unit for the bandwidth request amount, and presents a bandwidth request amount for the allocation determination to the allocation determining unit by dividing the bandwidth request amount into a plurality of request increments indicated by the history.

Station side communication device

A transmission buffer or buffers storing therein transmission cells for at least 2 (W-n.sub.a) cell time assuming that a window size in a ring is W cells and a number of transmission cells allocated to a node in said W cells is n.sub.a pieces, a transmission cell number counter for counting a number of transmission cells from the node within the W window size from a current point of time, and a transmission control means for sending out the transmission cells stored in said transmission buffer to a transfer path if a number of cells indicated by said transmission cell number counter is within a number of transmission cells allocated to the node are provided. Also at least 2n.sub.a pieces of transmission buffers are provided as transmission buffers assuming that a number of transmission cells allocated to the node is n.sub.a pieces.

Growing community of inventors

Tokyo, Japan

Ken Murakami