METHOD FOR REPEATED TRANSMISSION, AND TERMINAL DEVICE

• US 20200136766A1
• Filed: 12/27/2019
• Published: 04/30/2020
• Est. Priority Date: 06/28/2017
• 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: XU, Xiuqiang, WU, Yiqun, CHEN, Yan, WANG, Yi
• Granted Patent: US 11,343,030 B2
• Time in Patent Office: Days
• CPC Class Codes: H04L 1/0003 by switching between different modulation schemes
• CPC Class Codes: H04L 1/1819 with retransmission of additional or different redundancy
• CPC Class Codes: H04L 1/1822 involving configuration of automatic repeat request [ARQ] with parallel processes
• CPC Class Codes: H04L 1/1887 Scheduling and prioritising arrangements
• CPC Class Codes: H04L 1/189 Transmission or retransmission of more than one copy of a message
• CPC Class Codes: H04L 1/1896 ARQ related signaling
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames

Abstract

This application discloses a method for repeated transmission and a terminal device. The method implemented by a terminal device includes: determining a transmission time unit used in the first transmission of to-be-transmitted data; determining, by the terminal device based on the determined transmission time unit and a parameter Q, a hybrid automatic repeat request HARQ process used to transmit the to-be-transmitted data, where Q is an integer greater than or equal to 1; and when repeated transmission of the to-be-transmitted data is not terminated before the first specific transmission time unit, performing, starting from the determined transmission unit, one transmission of the to-be-transmitted data in each transmission time unit by using the HARQ process until the last transmission of the to-be-transmitted data is performed in the first specific transmission time unit, where a period of the specific transmission time unit in a time domain resource is Q transmission time units.

Claims

1. A method for repeated transmission, comprising:

determining, by a terminal device, a transmission time unit used in the first transmission of to-be-transmitted data;

determining, by the terminal device based on the determined transmission time unit and a parameter Q, a hybrid automatic repeat request HARQ process used to transmit the to-be-transmitted data, wherein Q is an integer greater than or equal to 1; and

when repeated transmission of the to-be-transmitted data is not terminated before the first specific transmission time unit after the determined transmission time unit, performing, by the terminal device starting from the determined transmission unit, one transmission of the to-be-transmitted data in each transmission time unit by using the HARQ process until the last transmission of the to-be-transmitted data is performed in the first specific transmission time unit, wherein a period of the specific transmission time unit in a time domain resource is Q transmission time units.

2. The method according to claim 1 wherein the parameter Q is specifically a maximum quantity of repeated transmissions.

3. The method according to claim 1, wherein a value of the parameter Q is less than a maximum quantity of repeated transmissions.

4. The method according to claim 1, wherein the method further comprises:

receiving, by the terminal device, information that carries the parameter Q and that is sent by a network device, and obtaining the parameter Q from the information carrying the parameter.

5. The method according to claim 1, wherein the determining, by the terminal device based on the determined transmission time unit and a parameter Q, a HARQ process used to transmit the to-be-transmitted data comprises:

determining a HARQ process number based on an index of the determined transmission time unit, the parameter Q, and a maximum quantity of supported HARQ processes.

6. The method according to claim 5, wherein the determining a HARQ process number based on an index of the determined transmission time unit, the parameter Q, and a maximum quantity of supported HARQ processes comprises:

determining the HARQ process number according to a first formula or a second formula, wherein

the first formula is;

HARQ_ID=floor(T_Index/Q)mod N; and

the second formula is;

HARQ_ID=floor(T_Index/Q)mod N+H_offset_value, wherein

floor( ) indicates rounding down, HARQ_ID is the HARQ process number, T_Index is the index of the transmission time unit, N is the maximum quantity of supported HARQ processes, and H_offset_value is a preset process number offset value.

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

before performing each repeated transmission of the to-be-transmitted data, determining, by the terminal device, whether a current transmission time unit is the first specific transmission time unit.

8. The method according to claim 7, wherein the determining whether a current transmission time unit is the first specific transmission time unit comprises:

when a value obtained by performing a modulo Q operation on an index of the current transmission time unit is equal to 0 or a preset time offset value, the current transmission time unit is the specific transmission time unit.

9. The method according to claim 1, wherein the method further comprises:

determining a redundancy version of the to-be-transmitted data in each transmission based on an index of a transmission time unit in which each transmission in repeated transmissions is performed.

10. The method according to claim 1, wherein the method further comprises:

determining, based on the index of the transmission time unit in which each transmission in the repeated transmissions is performed, an MCS that needs to be used in each transmission.

35. A computer readable storage medium, wherein the computer readable storage medium stores a computer program, and when the computer program is run on a computer, the computer is enabled to perform the method according to claim 1.

36. A computer program product, wherein the computer program product comprises a computer program, and when the computer program is run on a computer, the computer is enabled to perform the method according to claim 1.

37. A chip system, comprising a processor, configured to:

invoke a computer program from a memory, and run the computer program, so that a communications device in which the chip system is installed performs the method according to claim 1.

11. A terminal device, comprising:

a processing unit, configured to determine a transmission time unit used in the first transmission of to-be-transmitted data;

a HARQ process determining unit, configured to determine, based on the determined transmission time unit and a parameter Q, a hybrid automatic repeat request HARQ process used to transmit the to-be-transmitted data, wherein Q is an integer greater than or equal to 1; and

a transmission unit, configured to;

when repeated transmission of the to-be-transmitted data is not terminated before the first specific transmission time unit after the determined transmission time unit, perform, starting from the determined transmission unit, one transmission of the to-be-transmitted data in each transmission time unit by using the HARQ process until the last transmission of the to-be-transmitted data is performed in the first specific transmission time unit, wherein a period of the specific transmission time unit in a time domain resource is Q transmission time units.

12. The terminal device according to claim 11, wherein the parameter Q is specifically a maximum quantity of repeated transmissions.

13. The terminal device according to claim 11, wherein a value of the parameter Q is less than a maximum quantity of repeated transmissions.

14. The terminal device according to claim 11, wherein the terminal device further comprises:

a receiving unit, configured to;

receive information that carries the parameter Q and that is sent by a network device, and obtain the parameter Q from the information carrying the parameter.

15. The terminal device according to claim 11, wherein the HARQ process determining unit is specifically configured to:

determine a HARQ process number based on an index of the determined transmission time unit, the parameter Q, and a maximum quantity of supported HARQ processes.

16. The terminal device according to claim 15, wherein the determining a HARQ process number based on an index of the determined transmission time unit, the parameter Q, and a maximum quantity of supported HARQ processes comprises:

determining the HARQ process number according to a first formula or a second formula, wherein

the first formula is;

HARQ_ID=floor(T_Index/Q)mod N; and

the second formula is;

HARQ_ID=floor(T_Index/Q)mod N+H_offset_value, wherein

floor( ) indicates rounding down, HARQ_ID is the HARQ process number, T_Index is the index of the transmission time unit, N is the maximum quantity of supported HARQ processes, and H_offset_value is a preset process number offset value.

17. The terminal device according to claim 11, wherein the processing unit is further configured to:

before each repeated transmission of the to-be-transmitted data is performed, determine whether a current transmission time unit is the first specific transmission time unit.

18. The terminal device according to claim 17, wherein the determining whether a current transmission time unit is the first specific transmission time unit comprises:

when a value obtained by performing a modulo Q operation on an index of the current transmission time unit is equal to 0 or a preset time offset value, the current transmission time unit is the specific transmission time unit.

19. The terminal device according to claim 11, wherein the processing unit is further configured to:

determine a redundancy version of the to-be-transmitted data in each transmission based on an index of a transmission time unit in which each transmission in repeated transmissions is performed.

20. The terminal device according to claim 11, wherein the processing unit is further configured to:

determine, based on the index of the transmission time unit in which each transmission in the repeated transmissions is performed, an MCS that needs to be used in each transmission.

21. A method for repeated transmission, comprising:

determining, by a terminal device, a transmission time unit used in the first transmission of a data packet, wherein the determined transmission time unit is a transmission time unit in which a grant-free transmission resource is located and that is between two adjacent specific transmission time units, and is not the first transmission time unit in which a grant-free transmission resource is located and that is between the two adjacent specific transmission time units, a period of the specific transmission time unit in a time domain resource is Q transmission time units, and Q is an integer greater than or equal to 1;

determining, by the terminal device based on the determined transmission time unit and the parameter Q, a hybrid automatic repeat request HARQ process used to transmit the data packet; and

when repeated transmission of the data packet is not terminated before the latter specific transmission time unit in the two adjacent specific transmission time units, performing, by the terminal device starting from the determined transmission unit by using the HARQ process, one transmission of the data packet in a transmission time unit in which each grant-free transmission resource is located until the last transmission of the data packet is performed in the latter specific transmission unit.

22. The method according to claim 21, wherein the method further comprises:

receiving, by the terminal device, information that carries the parameter Q and that is sent by a network device, and obtaining a value of the parameter Q from the information carrying the parameter.

23. The method according to claim 21, wherein the determining, by the terminal device based on the determined transmission time unit and the parameter Q, a HARQ process used to transmit the data packet comprises:

determining a HARQ process number based on an index of the determined transmission time unit, the parameter Q, and a maximum quantity of supported HARQ processes.

24. The method according to claim 23, wherein the determining a HARQ process number based on an index of the determined transmission time unit, the parameter Q, and a maximum quantity of supported HARQ processes comprises:

determining the HARQ process number according to a first formula or a second formula, wherein

the first formula is;

HARQ_ID=floor(T_Index/Q)mod N; and

the second formula is;

HARQ_ID=floor(T_Index/Q)mod N+H_offset_value, wherein

floor( ) indicates rounding down, HARQ_ID is the HARQ process number, T_Index is the index of the transmission time unit, N is the maximum quantity of supported HARQ processes, and H_offset_value is a preset process number offset value.

25. The method according to claim 21, wherein the method further comprises:

before performing each repeated transmission of the data packet, determining, by the terminal device, whether a current transmission time unit is the latter specific time unit.

26. The method according to any one of claim 21, wherein the method further comprises:

determining a redundancy version of the data packet in each transmission based on an index of a transmission time unit in which each transmission in repeated transmissions is performed.

27. The method according to claim 26, wherein the method further comprises:

receiving redundancy version information that is associated with each transmission time unit and that is sent by the network device; and

the determining a redundancy version of the data packet in each transmission based on an index of a transmission time unit in which each transmission in repeated transmissions is performed comprises;

determining the redundancy version of the data packet in each transmission based on the received redundancy version information and the index of the transmission time unit in which each transmission in the repeated transmissions is performed.

28. A terminal device, comprising:

a processing unit, configured to determine a transmission time unit used in the first transmission of a data packet, wherein the determined transmission time unit is a transmission time unit in which a grant-free transmission resource is located and that is between two adjacent specific transmission time units, and is not the first transmission time unit in which a grant-free transmission resource is located and that is between the two adjacent specific transmission time units, a period of the specific transmission time unit in a time domain resource is Q transmission time units, and Q is an integer greater than or equal to 1;

a HARQ process determining unit, configured to determine, based on the determined transmission time unit and the parameter Q, a hybrid automatic repeat request HARQ process used to transmit the data packet; and

a transmission unit, configured to;

when repeated transmission of the data packet is not terminated before the latter specific transmission time unit in the two adjacent specific transmission time units, perform, starting from the determined transmission unit by using the HARQ process, one transmission of the data packet in a transmission time unit in which each grant-free transmission resource is located until the last transmission of the data packet is performed in the latter specific transmission unit.

29. The terminal device according to claim 28, wherein the terminal device further comprises:

a first receiving unit, configured to;

receive information that carries the parameter Q and that is sent by a network device, and obtain the parameter Q from the information carrying the parameter.

30. The terminal device according to claim 28, wherein the HARQ process determining unit is specifically configured to:

determine a HARQ process number based on an index of the determined transmission time unit, the parameter Q, and a maximum quantity of supported HARQ processes.

31. The terminal device according to claim 30, wherein the determining a HARQ process number based on an index of the determined transmission time unit, the parameter Q, and a maximum quantity of supported HARQ processes comprises:

determining the HARQ process number according to a first formula or a second formula, wherein

the first formula is;

HARQ_ID=floor(T_Index/Q)mod N; and

the second formula is;

HARQ_ID=floor(T_Index/Q)mod N+H_offset_value, wherein

floor( ) indicates rounding down, HARQ_ID is the HARQ process number, T_Index is the index of the transmission time unit, N is the maximum quantity of supported HARQ processes, and H_offset_value is a preset process number offset value.

32. The terminal device according to claim 28, wherein the processing unit is further configured to:

before each repeated transmission of the data packet is performed, determine whether a current transmission time unit is the latter specific transmission time unit.

33. The terminal device according to claim 28, wherein the processing unit is further configured to:

determine a redundancy version of the data packet in each transmission based on an index of a transmission time unit in which each transmission in repeated transmissions is performed.

34. The terminal device according to claim 28, wherein the terminal device further comprises:

a second receiving unit, configured to receive redundancy version information that is associated with each transmission time unit and that is sent by the network device; and

the processing unit is configured to determine the redundancy version of the data packet in each transmission based on the received redundancy version information and the index of the transmission time unit in which each transmission in the repeated transmissions is performed.

38. A terminal device, comprising a processor and a transceiver, wherein

the processor is configured to determine a transmission time unit used in the first transmission of a data packet, wherein the determined transmission time unit is a transmission time unit in which a grant-free transmission resource is located and that is between two adjacent specific transmission time units, and is not the first transmission time unit in which a grant-free transmission resource is located and that is between the two adjacent specific transmission time units, a period of the specific transmission time unit in a time domain resource is Q transmission time units, and Q is an integer greater than or equal to 1;

the processor is further configured to determine, based on the determined transmission time unit and the parameter Q, a hybrid automatic repeat request HARQ process used to transmit the data packet; and

the transceiver is configured to;

when repeated transmission of the data packet is not terminated before the latter specific transmission time unit in the two adjacent specific transmission time units, perform, starting from the determined transmission unit by using the HARQ process, one transmission of the data packet in a transmission time unit in which each grant-free transmission resource is located until the last transmission of the data packet is performed in the latter specific transmission unit.

39. The terminal device according to claim 38, wherein the transceiver is further configured to:

receive information that carries the parameter Q and that is sent by a network device, and obtain the parameter Q from the information carrying the parameter.

40. The terminal device according to claim 38, wherein the processor is configured to:

determine a HARQ process number based on an index of the determined transmission time unit, the parameter Q, and a maximum quantity of supported HARQ processes.

41. The terminal device according to claim 40, wherein the determining a HARQ process number based on an index of the determined transmission time unit, the parameter Q, and a maximum quantity of supported HARQ processes comprises:

determining the HARQ process number according to a first formula or a second formula, wherein

the first formula is;

HARQ_ID=floor(T_Index/Q)mod N; and

the second formula is;

HARQ_ID=floor(T_Index/Q)mod N+H_offset_value, wherein

floor( ) indicates rounding down, HARQ_ID is the HARQ process number, T_Index is the index of the transmission time unit, N is the maximum quantity of supported HARQ processes, and H_offset_value is a preset process number offset value.

42. The terminal device according to claim 38, wherein the processor is further configured to:

before each repeated transmission of the data packet is performed, determine whether a current transmission time unit is the latter specific transmission time unit.

43. The terminal device according to claim 38, wherein the processor is further configured to:

determine a redundancy version of the data packet in each transmission based on an index of a transmission time unit in which each transmission in repeated transmissions is performed.

44. The terminal device according to claim 38, wherein the transceiver is further configured to receive redundancy version information that is associated with each transmission time unit and that is sent by the network device;

and

the processor is configured to determine the redundancy version of the data packet in each transmission based on the received redundancy version information and the index of the transmission time unit in which each transmission in the repeated transmissions is performed.