Patent 7561557 was granted and assigned to Hitachi on July, 2009 by the United States Patent and Trademark Office.
A radio communication system arranged to deliver multimedia information into a plurality of mobile stations is arranged to deliver the multimedia information according to the wave circumstances of each mobile station, layer the information components composing the multimedia information, create the frame containing the layered information components and the transmission priorities of the components, connect the frames on a multimedia information unit, and then transmit the connected frames to a base station.