Patent ID: 7039066

Claim:
A dynamic bandwidth assignment system including a network unit configured to carry out cell slot assignment, and a network termination unit configured to transmit cells to the network unit by cell slots assigned by the network unit, said network unit comprising: a detection unit configured to detect valid cells and idle cells said network unit receives from said network termination unit; a decision unit configured to output a decision result on a cell slot assignment to the network termination unit based on the detection results by said detection unit; and a cell slot assignment unit configured to control the cell slot assignment to the network termination unit in response to the decision result of said decision unit, wherein said decision unit is configured to supply the decision result to said cell slot assignment unit when a number of valid cells said network unit receives from said network termination unit in a decision period becomes less than a second predetermined threshold value, and wherein said cell slot assignment unit is configured to reduce a number of the cell slots to be assigned to said network termination unit in response to the decision result.