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FALLS CHURCH, VA 22040-0747 (US) tion information for determining a maximum number of 9 combinations or a maximum frame length according to a Appl. No.: 10/557,004 usable radio band and a modulation method and combina tion possibility information for indicating that a combination PCT Fed: Jun. 3, 2004 of frames is possible. A frame combining unit combines a plurality of frames received from an outside access line, PCT No.: PCT/PO4/O8054 based on the combination information, the combination possibility information, and predetermined packet informa S 371 (c)(1), tion. A frame dividing unit divides a combined frame (2),(4) Date: Oct. 6, 2006 included in a received radio signal into individual frames.