Patent ID: 7366543

Claim:
A base station apparatus, including: a receiver which receives signals from a terminal apparatus which is a targeted communication party, each of the signals corresponding to one of a plurality of modulation methods; a permissible delay time detector which detects, from the signals received by said receiver, permissible delay time in data communication corresponding to an application used in said terminal apparatus; a quality detector which derives from the received signals a value indicative of the quality of a communication line; a decision unit which determines a modulation method to be used for data for the terminal apparatus and the number of channels per frame to be allocated to said terminal apparatus, in a communication line that contains a plurality of channels in a frame, according to the permissible delay time detected by said detector, so that the communication rate as determined by the modulation method and the number of channels approaches a predetermined value; and an instruction unit which instructs said terminal apparatus to perform communication of data corresponding to the application by using the modulation method and the number of channels determined by said decision unit, wherein if the detected permissible delay time is greater than a predetermined threshold value, said decision unit determines to use a modulation method capable of transmitting a relatively large amount of data according to the derived value indicative of the quality of a communication line, and, subsequently, to use a relatively small number of channels and if the detected permissible delay time is less than or equal to the predetermined threshold value, said decision unit determines to use a relatively large number of channels in accordance with the number of unoccupied channels, and, subsequently, to use a modulation method that ensures a relatively low error rate.