Methods and apparatuses for transmitting and receiving sidelink data

1. 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.

2. The apparatus according to claim 1 , wherein the sidelink data comprise one of the following: unicast data, first groupcast data, and second groupcast data,

the unicast data is transmitted by the first terminal equipment to a second terminal equipment,

the first groupcast data is transmitted by the first terminal equipment to at least two second terminal equipments, and the at least two second terminal equipments transmit feedback information in the same sidelink feedback channel, and

the second groupcast data is transmitted by the first terminal equipment to at least two second terminal equipments, the at least two second terminal equipments respectively transmit feedback information in at least two sidelink feedback channels.

3. The apparatus according to claim 1 ,

wherein the processor circuitry is configured to

transmit feedback information using code-division multiplex sequence according to the group cast information and the intragroup identifier.

4. The apparatus according to claim 1 ,

wherein the first terminal equipment and/or a second terminal equipment is/are configured or preconfigured with sidelink resource pool configuration information, and

the sidelink resource pool configuration information comprises first indication information used for indicating that a first time-frequency resource corresponds to the feedback resource set for conveying at least two sidelink feedback channels.

5. The apparatus according to claim 4 ,

wherein the sidelink resource pool configuration information further comprises a second indication information used for indicating a number of the sidelink feedback channels in the feedback resource set.

6. The apparatus according to claim 4 ,

wherein the number of the feedback channels corresponding to a first time-frequency resource configured in the sidelink resource pool configuration information is identical to the number of the feedback channels corresponding to another first time-frequency resource configured in the sidelink resource pool configuration information.

7. The apparatus according to claim 1 ,

wherein a first time-frequency resource is selected by the first terminal equipment and is taken as a frequency-domain starting position for transmitting the sidelink data.

8. The apparatus according to claim 1 ,

wherein the processor circuitry is configured to obtain the feedback resource set from a sub-channel to which a starting position of the sidelink data corresponds.

9. A communication system, comprising:

a first terminal equipment configured to transmit sidelink control information and sidelink data, the sidelink control information comprising information on at least one frequency-domain resource of the sidelink data and a group cast information; and

a second terminal equipment configured to receive the sidelink control information and the sidelink data, 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 the 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.

10. The system according to claim 9 ,

wherein the first terminal equipment and/or the second terminal equipment is/are configured or preconfigured with sidelink resource pool configuration information, and

the sidelink resource pool configuration information comprises first indication information used for indicating that a first time-frequency resource corresponds to the feedback resource set for conveying at least two sidelink feedback channels.

11. The system according to claim 10 ,

wherein the at least two sidelink feedback channels in the feedback resource set to which the first time-frequency resource corresponds are code-division multiplexed on the same resource block according to an intra-group identifier of a terminal equipment, and/or,

the at least two sidelink feedback channels to which the first time-frequency resource corresponds are frequency-division multiplexed by using different resource blocks according to an intra-group identifier of a terminal equipment.

12. The system according to claim 9 ,

wherein a first time-frequency resource is selected by the first terminal equipment and is taken as a frequency-domain starting position for transmitting the sidelink data.