Patent ID: 7181657

Claim:
An apparatus for transmitting data on radio waves between a master and at least one slave and controlling a rate of packet data transmitted between the master and the at least one slave adaptively to quality of an radio frequency (RF) channel, comprising: a controller for controlling error detection in packet data transmitted on the radio waves; a quality determining section for determining the quality of the packet data transmitted on a basis of an error detected; and a command generator, responsive to a result from determination of the quality of the packet data, for generating a command indicating an alteration of a sort of the packet data and sending out the command toward a source party having transmitted the packet data; and an alternating section responsive to the command generated for altering the sort of packet data in complying with the command, said controller controlling a start and an end of the error detection as well as measurement of the error detection in a period of detection time represented by a total number of slots accumulated in respect of the packet data supplied.