Method for transmitting frame according to time division duplex

PURPOSE: A frame transmission method according to a TDD method for improving the efficiency of frequency by minimizing the number of OFDM symbols is provided to prevent the interference without overlapping uplink transmission and downlink transmission between TDD systems. CONSTITUTION: A frame transmission method according to a TDD(Time Division Duplex) mode is as follows. A first frames are set up. A downlink sub frame is transmitted. The first frames include the uplink sub frame of down link sub frame at the switching point. The ratio of uplink sub frame and downlink sub frame included in the second sub frame are different from each other.