Methods and devices for transmission of feedback information and data retransmission

1. A method for data retransmission, comprising:

sending first data, by a second terminal device, to a first terminal device through device to device (D2D) communication;

receiving, by the second terminal device, feedback information of the first terminal device responsive to the first data, wherein the feedback information comprises a negative acknowledgment (NACK) message;

sending, by the second terminal device, a resource request message to a network device, according to the feedback information of the first terminal device responsive to the first data, wherein the resource request message is used for requesting a retransmission resource; and

obtaining the retransmission resource by the second terminal device according to indication of the network device, wherein the retransmission resource is used for retransmitting the first data, by the second terminal device to the first terminal device;

wherein a resource used for sending the resource request message by the second terminal device to the network device, is indicated by the network device in control information which is indicative of a resource used for sending the first data by the second terminal device, wherein the resource request message comprises the feedback information of the first terminal device responsive to the first data;

wherein the method further comprises:

resending the resource request message, by the second terminal device, to the network device, when the second terminal device receives another NACK message, from the network device, which indicates that the resource requested by the second terminal device cannot be used for retransmission.

2. The method of claim 1 , wherein the method further comprises:

retransmitting the first data, by the second terminal device, to the first terminal device on the retransmission resource through D2D communication, according to the feedback information of the first terminal device responsive to the first data.

3. The method of claim 1 , wherein the resource request message comprises at least one of time information and frequency information of a retransmission resource requested by the second terminal device.

4. The method of claim 1 , wherein the feedback information further comprises at least one of: channel quality information, power control information, and a multiple antenna scheme.

5. The method of claim 1 , wherein the resource used for sending the resource request message is one of a physical uplink control channel (PUCCH) and a physical uplink shared channel (PUSCH).

6. The method of claim 1 , wherein the resource request message is carried in one of a scheduling request (SR) message in a PUCCH, an ACK message/NACK message in the PUCCH, a MAC control element, and radio resource control (RRC) signaling.

7. The method of claim 1 , wherein the method further comprises:

receiving an available retransmission resource directly indicated by the network device by the second terminal device, when the second terminal device receives another NACK message, from the network device, which indicates that the resource requested by the second terminal device cannot be used for retransmission.

8. A terminal device, comprising:

at least one processor;

a transceiver; and

a memory storing instructions which, when executed by the at least one processor, cause the transceiver to:

send a first message to a first terminal device through device to device (D2D) communication;

receive feedback information of the first terminal device responsive to the first message, wherein the feedback information comprises a negative acknowledgment (NACK) message;

send a resource request message to a network device, according to the feedback information of the first terminal device responsive to first data, wherein the resource request message is used for requesting a retransmission resource; and

obtain the retransmission resource according to indication of the network device, wherein the retransmission resource is used for retransmitting the first data to the first terminal device;

wherein a resource used for sending the resource request message to the network device, is indicated by the network device in control information which is indicative of a resource used for sending the first message, wherein the resource request message comprises the feedback information of the first terminal device responsive to the first data;

wherein the instructions when executed by the at least one processor, further cause the transceiver to:

resend the resource request message to the network device when receiving another NACK message, from the network device, which indicates that the resource requested by the second terminal device cannot be used for retransmission.

9. The terminal device of claim 8 , wherein:

the transceiver is further configured to send first indication information to the first terminal device, wherein the first indication information is indicative of a feedback resource, and the feedback resource is a resource used for sending, by the first terminal device, to the terminal device the feedback information responsive to the first message through D2D communication;

the transceiver is further configured to receive second indication information sent by the network device, wherein the second indication information is indicative of the feedback resource; and

the at least one processor is configured to generate the first indication information according to the second indication information.

10. The terminal device of claim 9 , wherein the first indication information is indicative of at least one of time information and frequency information of the feedback resource.

11. The terminal device of claim 8 , wherein the feedback resource takes at least one of time and frequency of the terminal device as a synchronization reference.

12. The terminal device of claim 8 , wherein the feedback resource takes at least one of time and frequency of the network device as a synchronization reference.

13. The terminal device of claim 8 , wherein the feedback resource takes at least one of time and frequency of a global navigation satellite system (GNSS) as a synchronization reference.

14. The terminal device of claim 8 , wherein the feedback information further comprises at least one of: channel quality information, power control information, and a multiple antenna scheme.

15. The terminal device of claim 8 , wherein the first message comprises one of data information, control information, and a reference signal sent by the terminal device to the first terminal device.

16. The terminal device of claim 8 , wherein the instructions when executed by the at least one processor, further cause the transceiver to:

retransmit the first message to the first terminal device on the retransmission resource through D2D communication, according to feedback information of the first terminal device.

17. The terminal device of claim 8 , wherein the instructions when executed by the at least one processor, further cause the transceiver to:

receive an available retransmission resource directly indicated by the network device when receiving another NACK message, from the network device, which indicates that the resource requested from the network device cannot be used for retransmission.

18. A non-transitory computer readable storage medium, configured to store computer programs which, when executed, are operable with a computer to:

send first data to a first terminal device through device to device (D2D) communication;

receive feedback information of the first terminal device responsive to the first data, wherein the feedback information comprises a negative acknowledgment (NACK) message;

send a resource request message to a network device, according to the feedback information of the first terminal device responsive to the first data, wherein the resource request message is used for requesting a retransmission resource; and

obtain a retransmission resource according to indication of the network device, wherein the retransmission resource is used for retransmitting the first data to the first terminal device;

wherein a resource used for sending the resource request message to the network device, is indicated by the network device in control information which is indicative of a resource used for sending the first data by a second terminal device, wherein the resource request message comprises the feedback information of the first terminal device responsive to the first data;

wherein the computer programs when executed, are further operable with the computer to:

resend the resource request message to the network device when receiving another NACK message, from the network device, which indicates that the resource requested by the second terminal device cannot be used for retransmission.

19. The non-transitory computer readable storage medium of claim 18 , wherein the computer programs when executed, are further operable with the computer to:

retransmit the first message to the first terminal device on the retransmission resource through D2D communication, according to feedback information of the first terminal device.