The embodiment of the invention provides a communication method and device. The method may be performed by a
base station. The method comprises the following steps: receiving a first
acknowledgement from
terminal equipment, wherein the first
acknowledgement is used for indicating that an activation signaling of a secondary
cell is correctly received; sending a detection data packet to the terminal device; receiving a second
acknowledgement from the terminal device, the second acknowledgement being an acknowledgement of the detection data packet, the second acknowledgement being used for indicating that
data transmission is ready; and sending the data to the
terminal equipment. According to the method, after receiving the acknowledgement of the activation signaling, the
base station actively detects whether the
terminal equipment is ready for
data transmission, and if the terminal equipment is ready for
data transmission, the two parties can execute data transmission, so that the
data transmission time is advanced, the
waiting time is saved, the data transmission efficiency is improved, and the user experience is improved. And the communication time
delay is reduced. According to the method, the communication flexibility is also improved, and the user experience can also be improved.