Data transmission/receiving method and device

A data transmission device, applied to a base station, and comprising:

• an allocation module, configured to:
• allocate to each user equipment UE in a UE group a network resource required for performing device to device D2D communication, and use the network resource as a component carrier of each UE, wherein, each UE supports carrier aggregation CA;
• and
• a transmission module, configured to:
• divide data to be transmitted to the UE group into multiple pieces of component data information to respectively transmit to each UE, wherein, each UE shares the multiple pieces of component data information transmitted to each UE via the component carrier.

A data receiving device, applied to each user equipment UE in a UE group, and comprising:

• a receiving module, configured to:
• receive multiple pieces of component data information from a base station, wherein, the multiple pieces of component data information are obtained by the base station dividing data to be transmitted to the UE group, and each UE supports carrier aggregation CA;
• and
• a sharing module, configured to:
• use a network resource required for performing device to device D2D communication allocated for each UE as a component carrier, and share the multiple pieces of component data information via the component carrier.