Data transmission method, terminal, and ran device

1. A data transmission method, comprising:

receiving, by a terminal in a discontinuous reception (DRX) active period, first grant information from a radio access network (RAN) device, wherein the terminal uses the first grant information is used for initial transmission grant of first data;

sending or receiving, by the terminal, the first data by using the initial transmission grant of the first data;

starting, by the terminal after sending or receiving the first data, a retransmission active time in which the terminal expects to receive a retransmission grant for the first data;

receiving, by the terminal in the retransmission active time, second grant information from the RAN device, wherein the second grant information is used for initial transmission grant of second data; and

remaining, by the terminal, in an active state in an activation extension time that is after in response to receiving of the second grant information.

2. The method according to claim 1 , wherein the first data is empty.

3. The method according to claim 1 , wherein the first grant information is used for uplink initial transmission grant of the first data, wherein the retransmission active time comprises an uplink retransmission active time, and wherein the uplink retransmission active time is an active time in which the terminal expects to receive an uplink retransmission grant for the first data.

4. The method according to claim 3 , further comprising:

sending, by the terminal, the first data to the RAN device by using the uplink initial transmission grant of the first data according to the first grant information; and

receiving, by the terminal in the uplink retransmission active time, feedback information sent by from the RAN device, wherein the feedback information is used to provide a status of receiving the first data by the RAN device, and the feedback information indicates a successful acknowledgement (ACK).

5. The method according to claim 1 , wherein the first grant information is used for downlink initial transmission grant of the first data, wherein the retransmission active time comprises a downlink retransmission active time, and wherein the downlink retransmission active time is an active time in which the terminal expects to receive a downlink retransmission grant for the first data.

6. The method according to claim 5 , further comprising:

receiving, by the terminal from the RAN device, the first data by using the downlink initial transmission grant of the first data; and

sending, by the terminal, feedback information to the RAN device, wherein the feedback information is used to provide a status of receiving the first data by the terminal, and the feedback information indicates an unsuccessful acknowledgement (NACK).

7. The method according to claim 5 , wherein the downlink retransmission active time is determined according to a DRX retransmission timer.

8. The method according to claim 1 , wherein the activation extension time is determined according to a DRX inactivity timer.

9. A device, comprising a processor, configured to:

receive, in a discontinuous reception (DRX) active period, first grant information from a radio access network (RAN) device, wherein the first grant information is used for initial transmission grant of first data;

send or receive the first data by using the initial transmission grant of the first data;

start, after sending or receiving the first data, a retransmission active time in which the device expects to receive a retransmission grant for the first data;

receive, in the retransmission active time, second grant information from the RAN device, wherein the second grant information is used for initial transmission grant of second data; and

remain in an active state in an activation extension time that is in response to receiving of the second grant information.

10. The device according to claim 9 , wherein the first data is empty.

11. The device according to claim 9 , wherein the first grant information is used for uplink initial transmission grant of the first data, wherein the retransmission active time comprises an uplink retransmission active time, and wherein the uplink retransmission active time is an active time in which the terminal device expects to receive an uplink retransmission grant for the first data.

12. The device according to claim 11 , the processor is further configured to:

send the first data to the RAN device by using the uplink initial transmission grant of the first data; and

receive, in the uplink retransmission active time, feedback information from the RAN device, wherein the feedback information is used to provide a status of receiving the first data by the RAN device, and the feedback information indicates a successful acknowledgement (ACK).

13. The device according to claim 9 , wherein the first grant information is used for downlink initial transmission grant of the first data, wherein the retransmission active time comprises a downlink retransmission active time, and wherein the downlink retransmission active time is an active time in which the device expects to receive a downlink retransmission grant for the first data.

14. The device according to claim 13 , the processor is further configured to:

receive, from the RAN device, the first data by using the downlink initial transmission grant of the first data; and

send feedback information to the RAN device, wherein the feedback information is used to provide a status of receiving the first data by the device, and the feedback information indicates an unsuccessful acknowledgement (NACK).

15. The device according to claim 13 , wherein the downlink retransmission active time is determined according to a DRX retransmission timer.

16. The device according to claim 9 , wherein the activation extension time is determined according to a DRX inactivity timer.

17. The device according to claim 9 , the device is applied to a terminal or the device is a terminal.

18. A radio access network (RAN) device, comprising a processor, configured to:

send first grant information to a terminal in a DRX active period, wherein the first grant information is used for initial transmission grant of first data; and

receive or send the first data by using the initial transmission grant of the first data;

determine a retransmission active time in which the terminal expects to receive a retransmission grant for the first data; and

send second grant information to the terminal in the retransmission active time, wherein the second grant information is used for initial transmission grant of second data, wherein the second grant information is used for triggering terminal to remain in an active state in an activation extension time.

19. The RAN device according to claim 18 , wherein the first grant information is used for uplink initial transmission grant of the first data, wherein the retransmission active time comprises an uplink retransmission active time, and wherein the uplink retransmission active time is an active time in which the terminal expects to receive an uplink retransmission grant for the first data; or

wherein the first grant information is used for downlink initial transmission grant of the first data, wherein the retransmission active time comprises a downlink retransmission active time, and wherein the downlink retransmission active time is an active time in which the terminal expects to receive a downlink retransmission grant for the first data.

20. A non-transitory computer readable medium comprising a program, wherein when the program is executed by a processor, the following steps are performed:

receiving, in a discontinuous reception (DRX) active period, first grant information sent by from a radio access network (RAN) device, wherein the first grant information is used for initial transmission grant of first data;

sending or receiving the first data by using the initial transmission grant of the first data;

starting, after sending or receiving the first data, a retransmission active time in which a terminal expects to receive a retransmission grant for the first data;

receiving, in the retransmission active time, second grant information from the RAN device, wherein the second grant information is used for initial transmission grant of second data; and

remaining in an active state in an activation extension time that is after in response to receiving of the second grant information.