Data transmission method and apparatus
Embodiments of this application provide a data transmission method and an apparatus, and relate to the communication field, to indicate a plurality of codebooks or a plurality of sounding reference signal (SRS) resource combinations. The method includes: A terminal device receives first information, where the first information is used to indicate a plurality of codebooks; and the terminal device performs data transmission based on the plurality of codebooks, where each of the plurality of codebooks corresponds to one beam. Alternatively, a terminal device is configured to receive second information, where the second information is used to indicate N SRS resource combinations, where N is an integer greater than 1; and the terminal device performs data transmission based on the N SRS resource combinations, where each of the N SRS resource combinations corresponds to one beam. Embodiments of this application are applied to a 5G communication system.
1. A data transmission method, comprising:
receiving, by a terminal device, first information indicating a plurality of codebooks; and
performing, by the terminal device, data transmission based on the plurality of codebooks, wherein each of the plurality of codebooks corresponds to one beam.
2. The data transmission method according to claim 1 , wherein
the plurality of codebooks have a same quantity of layers.
3. The data transmission method according to claim 1 , wherein
the plurality of codebooks comprise a first codebook and a second codebook, the first codebook is determined from a first codebook set, the second codebook is determined from a second codebook set, and the second codebook set is a subset of the first codebook set.
4. The data transmission method according to claim 1 , wherein the first information is carried in a plurality of subfields of a first field, and each subfield is used to indicate one codebook.
5. The data transmission method according to claim 4 , wherein
a codebook indicated by a 1 st subfield in the plurality of subfields is determined from a first codebook set based on a value of the 1 st subfield, and the first codebook set comprises a plurality of codebooks.
6. The data transmission method according to claim 5 , wherein
a codebook indicated by an i th subfield in the plurality of subfields is determined from the second codebook set based on a value of the i th subfield, and the second codebook set is a subset of the first codebook set, wherein i is an integer greater than or equal to 2.
7. The data transmission method according to claim 6 , wherein
a length of the i th subfield is determined based on a quantity of codebooks comprised in the second codebook set.
8. The data transmission method according to claim 6 , wherein
the second codebook set comprises a codebook whose quantity of codebook layers is Q in the first codebook set, wherein Q is a quantity of layers of the codebook indicated by the 1 st subfield in the plurality of subfields, and Q is an integer greater than or equal to 1.
9. A data transmission method, comprising:
sending, by a network device, first information indicating a plurality of codebooks; and
performing, by the network device, data transmission based on the plurality of codebooks, wherein each of the plurality of codebooks corresponds to one beam.
10. The data transmission method according to claim 9 , wherein
the plurality of codebooks have a same quantity of layers.
11. The data transmission method according to claim 9 , wherein
the plurality of codebooks comprise a first codebook and a second codebook, the first codebook is determined from a first codebook set, the second codebook is determined from a second codebook set, and the second codebook set is a subset of the first codebook set.
12. The data transmission method according to claim 9 , wherein the first information is carried in a plurality of subfields of a first field, and each subfield is used to indicate one codebook.
13. The data transmission method according to claim 12 , wherein
a codebook indicated by a 1 st subfield in the plurality of subfields is determined from a first codebook set based on a value of the 1 st subfield, and the first codebook set comprises a plurality of codebooks.
14. An apparatus, comprising:
a receiver, configured to receive first information indicating a plurality of codebooks; and
a processor, configured to perform data transmission based on the plurality of codebooks, wherein each of the plurality of codebooks corresponds to one beam.
15. The apparatus according to claim 14 , wherein
the plurality of codebooks have a same quantity of layers.
16. The apparatus according to claim 14 , wherein
the plurality of codebooks comprise a first codebook and a second codebook, the first codebook is determined from a first codebook set, the second codebook is determined from a second codebook set, and the second codebook set is a subset of the first codebook set.
17. The apparatus according to claim 14 , wherein the first information is carried in a plurality of subfields of a first field, and each subfield is used to indicate one codebook.
18. The apparatus according to claim 17 , wherein
a codebook indicated by a 1 st subfield in the plurality of subfields is determined from a first codebook set based on a value of the 1 st subfield, and the first codebook set comprises a plurality of codebooks.
19. The apparatus according to claim 18 , wherein
a codebook indicated by an i th subfield in the plurality of subfields is determined from the second codebook set based on a value of the i th subfield, and the second codebook set is a subset of the first codebook set, wherein i is an integer greater than or equal to 2.
20. The apparatus according to claim 19 , wherein
a length of the i th subfield is determined based on a quantity of codebooks comprised in the second codebook set.