Methods and apparatuses for transmitting and receiving sidelink data

An apparatus for performing sidelink data communication, comprising:

• a memory that stores a plurality of instructions;
• and
• processor circuitry coupled to the memory and configured to execute the instructions to
• receive sidelink control information and sidelink data transmitted by a first terminal equipment, the sidelink data being received by at least two second terminal equipments, and the sidelink control information comprising information on at least one frequency-domain resource of the sidelink data and a group cast information;
• obtain a feedback resource set in which at least two sidelink feedback channels for the sidelink data is located, according to the information on at least one frequency-domain resource of the sidelink data;
• determine a resource of sidelink feedback channel in the feedback resource set for a second terminal equipment according the sidelink control information;
• and
• transmit feedback information to the first terminal equipment by using the sidelink feedback channel,
• wherein when the group cast information indicates that the sidelink data is a first group cast data, the resource of sidelink feedback channel in the feedback resource set is determined based on the at least one frequency-domain resource of the sidelink data, and
• when the group cast information indicates that the sidelink data is a second group cast data, the resource of sidelink feedback channel in the feedback resource set is determined based on the at least one frequency-domain resource of the sidelink data and an intragroup identifier of a terminal equipment;
• wherein when the number of terminal equipment in a group is less than or equal to the number of the sidelink feedback channels corresponds to a first time-frequency resource in a sidelink resource pool, at least two second terminal equipment are configured to transmit feedback information by using a same sidelink feedback channel or by using at least two respective sidelink feedback channels, and
• when the number of terminal equipment in a group is larger than the number of the sidelink feedback channels corresponds to a first time-frequency resource in the sidelink resource pool, at least two second terminal equipments are configured to transmit feedback information by using a same sidelink feedback channel.