Device-to-device communication method and terminal device

A terminal device, wherein the terminal device is a first terminal device, and the first terminal device comprises a processor, a transceiver and a memory, the memory is configured to store instructions, the processor is configured to execute the instructions stored in the memory to control the transceiver to receive a signal or transmit a signal, wherein:

• the transceiver is configured to receive a control channel transmitted by a second terminal device on a first transmission time interval (TTI), wherein the control channel comprises a specific bit, and the specific bit is used to indicate a length of time domain used by the second terminal device for transmitting a data channel;
• the processor is configured to sense the data channel transmitted by the second terminal device based on the first TTI if a value on the specific bit indicates that the length of time domain is equal to a length of the first TTI;
• and
• the processor is further configured to sense the data channel transmitted by the second terminal device based on a second TTI if the value on the specific bit indicates that the length of time domain is equal to a length of the second TTI, wherein the length of the second TTI is smaller than the length of the first TTI;
• wherein the first TTI comprises a plurality of second TTIs, if the value on the specific bit indicates that the length of time domain is equal to the length of the second TTI, the value on the specific bit further indicates a relative position of the second TTI used by the second terminal device for transmitting the data channel in the plurality of second TTIs.

A terminal device, wherein the terminal device is a second terminal device, and the second terminal device comprises a processor, a transceiver and a memory, the memory is configured to store instructions, the processor is configured to execute the instructions stored in the memory to control the transceiver to receive a signal or transmit a signal, wherein:

• the transceiver is configured to transmit a control channel to a first terminal device based on a first transmission time interval (TTI), wherein the control channel comprises a specific bit, and the specific bit is used to indicate that a length of time domain used by the second terminal device for transmitting a data channel is a length of a second TTI, and the length of the second TTI is smaller than a length of the first TTI;
• and
• the transceiver is further configured to transmit the data channel to the first terminal device based on the second TTI, so that the first terminal device determines, according to a value on the specific bit, that the length of time domain used by the second terminal device for transmitting the data channel is the length of the second TTI, and senses the data channel transmitted by the second terminal device based on the second TTI;
• wherein the first TTI comprises a plurality of second TTIs, if the value on the specific bit indicates that the length of time domain is equal to the length of the second TTI, the value on the specific bit further indicates a relative position of the second TTI used by the second terminal device for transmitting the data channel in the plurality of second TTIs.