Methods and devices for sidelink communication

A method for communications, comprising:

• receiving, at a first terminal device, a link identification of a sidelink from a second terminal device, the sidelink being between the first terminal device and the second terminal device;
• transmitting, to the second terminal device, sidelink control information including the link identification and a device identification of the second terminal device;
• and
• receiving, from the second terminal device, a Hybrid Automatic Repeat Request, HARQ, feedback for the sidelink control information, the HARQ feedback including the link identification and the device identification.

A method for communications, comprising:

• determining, at a first terminal device, whether a first sidelink between the first terminal device and a second terminal device has been established;
• in response to the determination that the first sidelink has not been established,
• transmitting, to a third terminal device, an indication that a link identification field is not to be included in sidelink control information,
• receiving, from the third terminal device, first sidelink control information via a second sidelink between the first terminal device and the third terminal device, the first sidelink control information including a first device identification of the first terminal device, and
• transmitting, to the third terminal device, a first Hybrid Automatic Repeat Request, HARQ, feedback for the first sidelink control information, the first HARQ feedback including the first device identification.