Transmission method and system for TDD mobile communication system to share time wireless frame

The present invention provides a method for transmitting the wireless frame when the TDD mobile communication systems coexist and a system thereof. Two TDD systems have same frame length of the wireless frames and are equally provided with a switching point from uplink to downlink and a switching point from downlink to uplink, wherein the second TDD system such as Wimax system confirms the lengthand the transmission time of the uplink subframe and downlink subframe in the wireless frame of the second TDD system according to the requirement that the homogeneous switching points of two systemsare aligned and according to the timing information of the wireless frame of the first TDD system such as TD-SCDMA system. The base station of the second TDD system transmits the downlink subframe according to the confirmed time, and indicates the transmission time of the uplink subframe in the transmitted uplink control information. The system completes the function with a frame time regulation and control module connected with two TDD systems. The method of the invention can facilitate that the TDD systems with different wireless frame structures coexist.