Techniques for enabling and performing harq transmissions in a d2d communication between wireless devices in a wireless telecommunications network

An network node for enabling Hybrid Automatic Repeat request (HARQ) transmissions in a device-to-device (D2D) communication between a first wireless device and a second wireless device in a wireless telecommunications network, wherein the first wireless device and the second wireless device are served by the network node in the wireless telecommunications network, wherein the network node comprises:

• processing circuitry configured to,
• transmit information to at least the first wireless device and the second wireless device indicating transmission resources to be used by at least the first wireless device and the second wireless device when transmitting a HARQ acknowledgement (A/N) transmission for a received data transmission in the D2D communication, wherein the information is associated with one or more Time-Division Duplexing (TDD) configurations,
• determine a TDD configuration of the one or more TDD configurations for data transmissions in the D2D communication between the first wireless device and the second wireless device, and
• transmit the determined TDD configuration to the first wireless device and the second wireless device.

A method performed by a first wireless device for performing Hybrid Automatic Repeat request (HARQ) transmissions in a device-to-device (D2D) communication with a second wireless device in a wireless telecommunications network, wherein the first wireless device and the second wireless device are served by a network node in the wireless telecommunications network, the method comprising:

• receiving information from the network node indicating transmission resources to be used by the first wireless device when transmitting a HARQ acknowledgement (A/N) transmission to the second wireless device for a received data transmission in the D2D communication, wherein the information is associated with one or more Time-Division Duplexing (TDD) configurations;
• receiving a TDD configuration of the one or more TDD configurations from the network node for data transmissions in the D2D communication with the second wireless device;
• determining a HARQ A/N transmission timing for received data transmissions in the D2D communication based on the received TDD configuration;
• determining transmission resources to be used when transmitting a HARQ A/N transmission for received data transmissions in the D2D communication based on the received information indicating the transmission resources and the determined HARQ A/N transmission timing;
• and
• transmitting the HARQ A/N transmission on the determined transmission resources to the second wireless device in response to receiving a data transmission from the second wireless device in the D2D communication.

A first wireless device for performing Hybrid Automatic Repeat request (HARQ) transmissions in a device-to-device (D2D) communication with a second wireless device in a wireless telecommunications network, wherein the first wireless device and the second wireless device are served by a network node in the wireless telecommunications network, the first wireless device comprising:

• a processing circuitry configured to,
• receive information from the network node indicating transmission resources to be used by the first wireless device, when transmitting a HARQ acknowledgement (A/N) transmission to the second wireless device for a received data transmission in the D2D communication, wherein the information is associated with one or more Time-Division Duplexing (TDD) configurations,
• receive a TDD configuration of the one or more TDD configurations from the network node for data transmissions in the D2D communication with the second wireless device,
• determine a HARQ A/N transmission timing for received data transmissions in the D2D communication based on the received TDD configuration,
• determine transmission resources to be used when transmitting a HARQ A/N transmission for received data transmissions in the D2D communication based on the received information indicating the transmission resources and the determined HARQ A/N transmission timing, and
• transmit the HARQ A/N transmission on the determined transmission resources to the second wireless device in response to receiving a data transmission from the second wireless device in the D2D communication.