Data transmission method, network device, and terminal device
Embodiments of the present disclosure provide a data transmission method, a network device, and a terminal device. A network device configures N groups of scheduling information based on a requirement of a terminal device group, configures at least one piece of downlink data based on M groups of scheduling information in the N groups of scheduling information, and sends first downlink data to a first terminal device in a first transmission time unit. Correspondingly, the first terminal device determines the N groups of scheduling information, and detects the first downlink data in the first transmission time unit based on the N groups of scheduling information. In the process, the first downlink data can be successfully transmitted through a plurality of transmissions and one successful detection, thereby implementing highly reliable data transmission. In addition, not only low reliability of PDCCH dynamic scheduling is avoided without introducing a large quantity of control overheads, but also link adaptation can be obtained.
1. A data transmission method, comprising:
configuring, by a network device, N groups of scheduling information, wherein N is a positive integer;
configuring, by the network device, first downlink data based on M groups of scheduling information in the N groups of scheduling information, including:
separately modulating, by the network device, M pieces of downlink data based on M modulation and coding schemes (MCSs) indicated in the M groups of scheduling information, and/or
respectively mapping, by the network device, the M pieces of downlink data onto M channel resources indicated in the M groups of scheduling information, wherein M is a positive integer less than or equal to N; and
sending, by the network device, the first downlink data to a first terminal device in a first transmission time unit, wherein the first downlink data comprises the M pieces of downlink data, the M pieces of downlink data carry same information.
2. The method according to claim 1 , wherein:
the M groups of scheduling information comprise an i th group of scheduling information in the N groups of scheduling information; and
the i th group of scheduling information indicates:
S i channel resources, or
S i channel resources and S i modulation and coding schemes (MCSs), or
S i channel resources, S i MCSs and S i redundancy versions (RVs), and
wherein S i is an integer greater than 1.
3. The method according to claim 2 , wherein:
the first downlink data comprises S i pieces of downlink data; and
configuring, by the network device, first downlink data based on M groups of scheduling information in the N groups of scheduling information comprises:
configuring, by the network device, the S i pieces of downlink data based on the i th group of scheduling information, wherein the S i pieces of downlink data carry same information.
4. The method according to claim 3 , wherein:
the first downlink data further comprises S j pieces of downlink data;
the M groups of scheduling information comprise a j th group of scheduling information in the N groups of scheduling information;
the j th group of scheduling information and the i th group of scheduling information are different scheduling information; and
configuring, by the network device, first downlink data based on M groups of scheduling information in the N groups of scheduling information comprises:
configuring, by the network device, the S j pieces of downlink data based on the j th group of scheduling information, wherein the S j pieces of downlink data carry same information, and wherein the information carried in the S j pieces of downlink data is different from the information carried in the S i pieces of downlink data, and S j is a positive integer.
5. The method according to claim 1 , further comprising:
configuring, by the network device, second downlink data based on P groups of scheduling information in the N groups of scheduling information, wherein P is a positive integer less than or equal to N; and
sending, by the network device, the second downlink data to a second terminal device in a second transmission time unit.
6. The method according to claim 5 , wherein:
the first transmission time unit does not overlap the second transmission time unit, and the M groups of scheduling information are the same as, partially the same as, or different from the P groups of scheduling information; or
the first transmission time unit overlaps or partially overlaps the second transmission time unit, and the M groups of scheduling information are different from the P groups of scheduling information.
7. The method according to claim 1 , wherein before sending, by the network device, the first downlink data to the first terminal device in a first transmission time unit, the method further comprises:
sending, by the network device, scheduling information indication signaling to the first terminal device and/or a second terminal device for indicating the N groups of scheduling information, and wherein the scheduling information indication signaling is higher layer signaling or physical layer signaling.
8. The method according to claim 1 , further comprising:
sending, by the network device, downlink data indication signaling to the first terminal device in the first transmission time unit for indicating whether the first downlink data is sent within the first transmission time unit.
9. A data transmission method, comprising:
determining, by a first terminal device, N groups of scheduling information, wherein N is a positive integer; and
detecting, by the first terminal device, first downlink data in a first transmission time unit based on the N groups of scheduling information, including:
extracting, by the first terminal device in the first transmission time unit, M pieces of downlink data from M channel resources indicated in M groups of the N groups of scheduling information; and/or
demodulating, by the first terminal device, the M pieces of downlink data in the first transmission time unit based on M modulation and coding schemes (MCSs) indicated in the M groups of scheduling information, wherein the first downlink data comprises the M pieces of downlink data, and the M pieces of downlink data carry same information.
10. The method according to claim 9 , wherein the first downlink data is configured by a network device based on the M groups of scheduling information in the N groups of scheduling information, and M is a positive integer less than or equal to N.
11. The method according to claim 10 , wherein:
the M groups of scheduling information comprise an i th group of scheduling information in the N groups of scheduling information; and
the i th group of scheduling information indicates:
S i channel resources, or
S i channel resources and S i M modulation and coding schemes (MCSs), or
S i channel resources, S i MCSs and S i redundancy versions (RVs), and
wherein S i is an integer greater than 1.
12. The method according to claim 11 , wherein:
the first downlink data comprises S i pieces of downlink data; and
detecting, by the first terminal device, first downlink data in a first transmission time unit based on the N groups of scheduling information comprises:
detecting, by the first terminal device, the S i pieces of downlink data based on the i th group of scheduling information, wherein the S i pieces of downlink data carry same information.
13. The method according to claim 12 , wherein:
the first downlink data further comprises S j pieces of downlink data;
the M groups of scheduling information comprise a j th group of scheduling information in the N groups of scheduling information;
the j th group of scheduling information and the i th group of scheduling information are different scheduling information; and
detecting, by the first terminal device, first downlink data in a first transmission time unit based on the N groups of scheduling information comprises:
detecting, by the first terminal device, the S j pieces of downlink data based on the j th group of scheduling information, wherein the S j pieces of downlink data carry same information, and wherein the information carried in the S j pieces of downlink data is different from the information carried in the S i pieces of downlink data, and S j is a positive integer.
14. The method according to claim 9 , wherein before detecting, by the first terminal device, first downlink data in a first transmission time unit based on the N groups of scheduling information, the method further comprises:
receiving, by the first terminal device, scheduling information indication signaling sent by a network device for indicating the N groups of scheduling information, and the scheduling information indication signaling is higher layer signaling or physical layer signaling.
15. The method according to claim 9 , wherein before detecting, by the first terminal device, first downlink data in a first transmission time unit based on the N groups of scheduling information, the method further comprises:
receiving, by the first terminal device, downlink data indication signaling that is sent by a network device in the first transmission time unit for indicating whether the first downlink data is sent within the first transmission time unit.
16. A network device, comprising:
a processor configured to:
configure N groups of scheduling information, wherein N is a positive integer, and
configure first downlink data based on M groups of scheduling information in the N groups of scheduling information, including:
separately modulate M pieces of downlink data based on M modulation and coding schemes (MCSs) indicated in M groups of the N groups of scheduling information, and/or
respectively maps the M pieces of downlink data onto M channel resources indicated in the M groups of scheduling information, wherein M is a positive integer less than or equal to N; and
a transceiver configured to send the first downlink data to a first terminal device in a first transmission time unit, wherein the first downlink data comprises the M pieces of downlink data, and the M pieces of downlink data carry same information.
17. The network device according to claim 16 , wherein:
the M groups of scheduling information comprise an i th group of scheduling information in the N groups of scheduling information; and
the i th group of scheduling information indicates:
S i channel resources, or
S i channel resources and S i MCSs, or
S i channel resources, S i MCSs and S i redundancy versions (RVs), and
wherein S i is an integer greater than 1.