Transmitting method for time division duplex mobile communication system

The method includes following arrangements: using wireless frame as basic time unit of signal transmission; length of wireless frame is 10 ms or 5 ms; when being in 10 ms, a wireless frame contains 19 operation time slots, and 3 special time slots; when being in 5 ms, a wireless frame contains 9 operation time slots, and 3 special time slots; length of each operation time slot is 0.5ms, and sum of 3 special time slots is 0.5ms, the 3 special time slots are consecutive in time; one wireless frame can have one or more up and down going transition points; guard gap is collocated at first down going to up going transition point, other down going to up going transition points adds guard gap based on coverage area of sector; short guard gap is collocated or not collocated at end of operation time gap based on condition. Using features of TDD mode effectively, the invention provides higher flexibility and lower transmission delay.