Transmission method, base station and terminal

Provided in the embodiments of the present invention are a transmission method, a base station and a terminal. The method comprises: a source base station sending to a terminal a switching command for triggering the process of switching the terminal from the source base station to a target base station, the source base station maintaining the transmission of user data between the source base station and the terminal; and during switching, when the transmission of the user data between the source base station and the terminal is stopped, the source base station sending to the terminal a first status report, the first status report being used for indicating to the terminal the reception condition of the terminal's uplink data by the source base station. Thus, the present invention can effectively improve the transmission efficiency of the user data.