A device to device, D2D, user equipment , comprising: a transceiver , being configured to receive a wireless signal , wherein the wireless signal has a hybrid access channel carrying a D2D hybrid access map, the D2D hybrid access map is generated by a base station , and the D2D hybrid access map indicates a D2D resource block; and a processor electrically connected to the transceiver , being configured to retrieve the D2D hybrid access map from the hybrid access channel; wherein when the D2D user equipment is a first D2D user equipment , the first D2D user equipment is configured to transmit a D2D hybrid access request to a second D2D user equipment via the D2D resource block, to receive a D2D hybrid access response from the second D2D user equipment via the D2D resource block, and to perform a D2D data transmission with the second D2D user equipment via a plurality of sub-resource blocks in the D2D resource block indicated by a piece of D2D data transmission information carried in the D2D hybrid access response ; wherein when the D2D user equipment is the second D2D user equipment , the second D2D user equipment is configured to receive the D2D hybrid access request from the first D2D user equipment via the D2D resource block, to transmit the D2D hybrid access response to the first D2D user equipment via the D2D resource block after receiving the D2D hybrid access request , and then to perform the D2D data transmission with the first D2D user equipment via the sub-resource blocks in the D2D resource block indicated by the piece of D2D data transmission information carried in the D2D hybrid access response . a transceiver , being configured to receive a wireless signal , wherein the wireless signal has a hybrid access channel carrying a D2D hybrid access map, the D2D hybrid access map is generated by a base station , and the D2D hybrid access map indicates a D2D resource block; and a processor electrically connected to the transceiver , being configured to retrieve the D2D hybrid access map from the hybrid access channel; wherein when the D2D user equipment is a first D2D user equipment , the first D2D user equipment is configured to transmit a D2D hybrid access request to a second D2D user equipment via the D2D resource block, to receive a D2D hybrid access response from the second D2D user equipment via the D2D resource block, and to perform a D2D data transmission with the second D2D user equipment via a plurality of sub-resource blocks in the D2D resource block indicated by a piece of D2D data transmission information carried in the D2D hybrid access response ; wherein when the D2D user equipment is the second D2D user equipment , the second D2D user equipment is configured to receive the D2D hybrid access request from the first D2D user equipment via the D2D resource block, to transmit the D2D hybrid access response to the first D2D user equipment via the D2D resource block after receiving the D2D hybrid access request , and then to perform the D2D data transmission with the first D2D user equipment via the sub-resource blocks in the D2D resource block indicated by the piece of D2D data transmission information carried in the D2D hybrid access response . <EOS>