Apparatus for bi-directional communication based on the use of auxiliary bands in wireless communication system

A bidirectional communication device using auxiliary bands in a wireless communication system is provided to add one or two auxiliary bands to a primary band, and to transceive signals through a frame consisting of plural short slots, thereby satisfying a delay request condition by transceiving feedback information and user data signals by slot unit. A base station transmits downlink data through more than one primary band in the first transmission section of a frame, receives uplink data through more than one auxiliary band, receives uplink data through more than one primary band in the second transmission section, and transmits downlink data through more than one auxiliary band. A terminal receives the downlink data through more than one primary band in the first transmission section of the frame, transmits the uplink data through more than one auxiliary band, transmits the uplink data through more than one primary band in the second transmission section, and receives the downlink data through more than one auxiliary band.