Data transmission method, terminal, and ran device

• US 10,594,447 B2
• Filed: 03/09/2018
• Issued: 03/17/2020
• Est. Priority Date: 09/10/2015
• Status: Active Grant

• Current Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Original Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Inventors: Wang, Yifan, Li, Lian, Kong, Xiangzhen
• Primary Examiner(s): Haile, Feben
• Application Number:
  US15/917,015
• Publication Number:
  US 20180198572A1
• Time in Patent Office: 739 Days
• CPC Class Codes: H04L 1/1812 Hybrid protocols; Hybrid automatic repeat request [HARQ]
• CPC Class Codes: H04L 1/1854 Scheduling and prioritising arrangements
• CPC Class Codes: H04L 5/0055 Physical resource allocation for ACK/NACK for physical mapping arrangements in ARQ protocols H04L1/1861
• CPC Class Codes: H04W 28/0278 using buffer status reports dynamic wireless traffic scheduling definition H04W72/12
• CPC Class Codes: H04W 52/02 Power saving arrangements in wired systems H04L12/12; signaling of mobile application services, e.g. low battery notifications H04W4/20
• CPC Class Codes: H04W 52/0216 using a pre-established activity schedule, e.g. traffic indication frame
• CPC Class Codes: H04W 52/0229 where the received signal is a wanted signal
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 76/28 Discontinuous transmission [DTX]; Discontinuous reception [DRX]
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A data transmission method is provided to resolve a problem of data transmission delay in a DRX mechanism. A RAN device sends, to a terminal in a DRX active period, first grant information that is used to perform initial transmission grant for first data. The RAN device sends, to the terminal in a retransmission active time in which the terminal expects to receive a retransmission grant for the first data, second grant information that is used to perform initial transmission grant for second data. Then the RAN device and the terminal remain in an active state in an activation extension time that is after sending of the second grant information. In this way, the RAN device may perform initial transmission by using a retransmission active time, so as to extend an active time.

Claims

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.