Patent ID: 8638669

Claim:
A path control system comprising: a network including communication devices that communicate via a radio link that uses adaptive modulation; and a path control device predicting a future modulation mode for the radio link and setting a communication path for the network based on a predicted mode that is the predicted modulation mode, wherein upon externally receiving an admission request for permission of utilization of the network, the path control device predicts the modulation mode for the radio link, searches for the communication path that meets the admission request based on the predicted mode, permits the admission request if an appropriate path is found, and transmits path information indicating traffic, which corresponds to the admission request, and the communication path used for transmission, to all communication devices on the communication oath in order to allow each communication device to update a path table, wherein the path control device predicts the modulation modes corresponding to priority classes to which a plurality of the traffic belongs respectively, assumes that a cost is w, that a transmission rate is BW, and that a band used by the traffic is D, corresponding to each of the priority classes, estimates the cost by an equation, w=1/(BW−D), corresponding to the radio link based on each of the priority classes, and sets the communication path in accordance with each of the priority classes so as to minimize the cost.