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Abstract

A method of controlling a communication network including VC exchange nodes-and VP exchange nodes such that the cell flow of each VP can be maintained within the prescribed characteristic while the end-to-end cell transfer quality for VCs can be estimated easily and accurately. In the network, a cell transfer from the VC exchange nodes to the VP exchange nodes is controlled within prescribed traffic characteristics specified to VPs; a cell transfer quality at each of the VC exchange node is specified in terms of a first cell transfer quality dependent on the control of the cell transfer, and a second cell transfer quality independent on the control of the cell transfer; a cell transfer quality at each of the VP exchange node is specified by a third cell transfer quality independent on the control of the cell transfer alone; an end-to-end cell transfer quality for each VC in the network is estimated in terms of the cell transfer quality of each of the VC exchange nodes and the cell transfer quality of each of the VP exchange nodes; and the bandwidth management in the network is carried out such that the estimated end-to-end cell transfer quality becomes higher than a desired quality of service.

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