Method and device for determining data transmission

Embodiments of the present invention provide a method and device for determining data transmission, relate to the technical field of mobile communications field and are capable of ensuring the normal communication between a base station and a UE (User Equipment), thereby improving the communication efficiency between the base station and the UE. The method comprises: a communication device determines that the current sub-frame belongs to a first time period, and the first time period is the time period modulated by a secondary carrier; the communication device determines the data transmission of the current sub-frame.