DMRS port indication method and apparatus

1. A demodulation reference signal (DMRS) port indication method, comprising:

determining DMRS port indication information, wherein:

the DMRS port indication information is used to indicate a DMRS port set, and the DMRS port set is one of a plurality of DMRS port sets;

a part of the plurality of DMRS port sets are first DMRS port sets, and DMRS ports comprised in each first DMRS port set belong to two code domain multiplexing (CDM) groups; and

another part of the plurality of DMRS port sets are second DMRS port sets, and at least one DMRS port comprised in each second DMRS port set belongs to a same CDM group;

determining quasi-co-location (QCL) indication information, wherein the QCL indication information indicates two pieces of QCL information, the two pieces of QCL information comprising a first piece of QCL information and a second piece of QCL information, wherein:

when the DMRS port set indicated by the DMRS port indication information is a first DMRS port set, the two pieces of QCL information in each precoding resource group (PRG) indicate a reception of a DMRS and data of a corresponding PRG, a DMRS port belonging to a first CDM group is associated with the first piece of QCL information, a DMRS port belonging to a second CDM group is associated with the second piece of QCL information, and

when the DMRS port set indicated by the DMRS port indication information is a second DMRS port set, one of the two pieces of QCL information is associated with reception of a DMRS and corresponding data in each PRG, wherein different pieces of QCL information are used to receive DMRSs and corresponding data in adjacent PRGs; and

sending the DMRS port indication information and the QCL indication information.

2. The DMRS port indication method according to claim 1 , wherein the first piece of QCL information is different from the second piece of QCL information.

3. The DMRS port indication method according to claim 1 , wherein each first DMRS port set is used to indicate that QCL information used to transmit corresponding physical downlink shared channels (PDSCHs) in different time units or frequency domain units is the same, and the PDSCHs in the different time units or frequency domain units correspond to one redundancy version of a same resource block.

4. The DMRS port indication method according to claim 1 , wherein each first DMRS port set is used to indicate that QCL information used to transmit corresponding physical downlink shared channels (PDSCHs) in different time units or frequency domain units is the same, and the PDSCHs in the different time units or frequency domain units correspond to different redundancy versions of a same resource block.

5. The DMRS port indication method according to claim 1 , wherein when the DMRS port set indicated by the DMRS port indication information is the first DMRS port set or the second DMRS port set, transmission on a corresponding PDSCH is single-user multiple-input multiple-output (SU-MIMO) transmission.

6. A demodulation reference signal (DMRS) port indication method, comprising:

receiving DMRS port indication information, wherein:

the DMRS port indication information is used to indicate a DMRS port set, and the DMRS port set is one of a plurality of DMRS port sets;

a part of the plurality of DMRS port sets are first DMRS port sets, and DMRS ports comprised in each first DMRS port set belong to two code domain multiplexing (CDM) groups; and

another part of the plurality of DMRS port sets are second DMRS port sets, and at least one DMRS port comprised in each second DMRS port set belongs to a same CDM group;

receiving quasi-co-location (QCL) indication information, wherein the QCL indication information indicates two pieces of QCL information, the two pieces of QCL information comprising a first piece of QCL information and a second piece of QCL information, wherein:

when the DMRS port set indicated by the DMRS port indication information is a first DMRS port set, the two pieces of QCL information in each precoding resource group (PRG) indicate a reception of a DMRS and data of a corresponding PRG, a DMRS port belonging to a first CDM group is associated with the first piece of QCL information, a DMRS port belonging to a second CDM group is associated with the second piece of QCL information, and

when the DMRS port set indicated by the DMRS port indication information is a second DMRS port set, one of the two pieces of QCL information is associated with reception of a DMRS and corresponding data in each PRG, wherein different pieces of QCL information are used to receive DMRSs and corresponding data in adjacent PRGs; and

receiving the DMRS and corresponding data.

7. The DMRS port indication method according to claim 6 , wherein the first piece of QCL information is different from the second piece of QCL information.

8. The DMRS port indication method according to claim 6 , wherein each first DMRS port set is used to indicate that QCL information used to transmit corresponding physical downlink shared channels (PDSCHs) in different time units or frequency domain units is the same, and the PDSCHs in the different time units or frequency domain units correspond to one redundancy version of a same resource block.

9. The DMRS port indication method according to claim 6 , wherein each first DMRS port set is used to indicate that QCL information used to transmit corresponding physical downlink shared channels (PDSCHs) in different time units or frequency domain units is the same, and the PDSCHs in the different time units or frequency domain units correspond to different redundancy versions of a same resource block.

10. The DMRS port indication method according to claim 6 , wherein when the DMRS port set indicated by the DMRS port indication information is the first DMRS port set or the second DMRS port set, transmission on a corresponding PDSCH is single-user multiple-input multiple-output (SU-MIMO) transmission.

11. A communication apparatus, comprising:

at least one processor; and

one or more memories coupled to the at least one processor and storing programming instructions for execution by the at least one processor to:

determine DMRS port indication information, wherein:

the DMRS port indication information is used to indicate a DMRS port set, and the DMRS port set is one of a plurality of DMRS port sets;

a part of the plurality of DMRS port sets are first DMRS port sets, and DMRS ports comprised in each first DMRS port set belong to two code domain multiplexing (CDM) groups; and

another part of the plurality of DMRS port sets are second DMRS port sets, and at least one DMRS port comprised in each second DMRS port set belongs to a same CDM group;

determine quasi-co-location (QCL) indication information, wherein the QCL indication information indicates two pieces of QCL information, the two pieces of QCL information comprising a first piece of QCL information and a second piece of QCL information, wherein:

when the DMRS port set indicated by the DMRS port indication information is a first DMRS port set, the two pieces of QCL information in each precoding resource group (PRG) indicate a reception of a DMRS and data of a corresponding PRG, a DMRS port belonging to a first CDM group is associated with the first piece of QCL information, a DMRS port belonging to a second CDM group is associated with the second piece of QCL information, and

when the DMRS port set indicated by the DMRS port indication information is a second DMRS port set, one of the two pieces of QCL information is associated with reception of a DMRS and corresponding data in each PRG, wherein different pieces of QCL information are used to receive DMRSs and corresponding data in adjacent PRGs; and

send the DMRS port indication information and the QCL indication information.

12. The communication apparatus according to claim 11 , wherein the first piece of QCL information is different from the second piece of QCL information.

13. The communication apparatus according to claim 11 , wherein each first DMRS port set is used to indicate that QCL information used to transmit corresponding physical downlink shared channels (PDSCHs) in different time units or frequency domain units is the same, and the PDSCHs in the different time units or frequency domain units correspond to one redundancy version of a same resource block.

14. The communication apparatus according to claim 11 , wherein each first DMRS port set is used to indicate that QCL information used to transmit corresponding physical downlink shared channels (PDSCHs) in different time units or frequency domain units is the same, and the PDSCHs in the different time units or frequency domain units correspond to different redundancy versions of a same resource block.

15. The communication apparatus according to claim 11 , wherein when the DMRS port set indicated by the DMRS port indication information is the first DMRS port set or the second DMRS port set, transmission on a corresponding PDSCH is single-user multiple-input multiple-output (SU-MIMO) transmission.

16. A communication apparatus, comprising:

at least one processor; and

one or more memories coupled to the at least one processor and storing programming instructions for execution by the at least one processor to:

receive DMRS port indication information, wherein:

the DMRS port indication information is used to indicate a DMRS port set, and the DMRS port set is one of a plurality of DMRS port sets;

a part of the plurality of DMRS port sets are first DMRS port sets, and DMRS ports comprised in each first DMRS port set belong to two code domain multiplexing (CDM) groups; and

another part of the plurality of DMRS port sets are second DMRS port sets, and at least one DMRS port comprised in each second DMRS port set belongs to a same CDM group;

receive quasi-co-location (QCL) indication information, wherein the QCL indication information indicates two pieces of QCL information, the two pieces of QCL information comprising a first piece of QCL information and a second piece of QCL information, wherein:

when the DMRS port set indicated by the DMRS port indication information is a first DMRS port set, the two pieces of QCL information in each precoding resource group (PRG) indicate a reception of a DMRS and data of a corresponding PRG, a DMRS port belonging to a first CDM group is associated with the first piece of QCL information, a DMRS port belonging to a second CDM group is associated with the second piece of QCL information, and

when the DMRS port set indicated by the DMRS port indication information is a second DMRS port set, one of the two pieces of QCL information is associated with reception of a DMRS and corresponding data in each PRG, wherein different pieces of QCL information are used to receive DMRSs and corresponding data in adjacent PRGs; and

receive the DMRS and corresponding data.

17. The communication apparatus according to claim 16 , wherein the first piece of QCL information is different from the second piece of QCL information.

18. The communication apparatus according to claim 16 , wherein each first DMRS port set is used to indicate that QCL information used to transmit corresponding physical downlink shared channels (PDSCHs) in different time units or frequency domain units is the same, and the PDSCHs in the different time units or frequency domain units correspond to one redundancy version of a same resource block.

19. The communication apparatus according to claim 16 , wherein each first DMRS port set is used to indicate that QCL information used to transmit corresponding physical downlink shared channels (PDSCHs) in different time units or frequency domain units is the same, and the PDSCHs in the different time units or frequency domain units correspond to different redundancy versions of a same resource block.

20. The communication apparatus according to claim 16 , wherein when the DMRS port set indicated by the DMRS port indication information is the first DMRS port set or the second DMRS port set, transmission on a corresponding PDSCH is single-user multiple-input multiple-output (SU-MIMO) transmission.

21. A non-transitory computer-readable storage medium, wherein the non-transitory computer-readable storage medium stores computer-executable instructions that, when executed by a computer, cause the computer to perform operations comprising:

determining demodulation reference signal (DMRS) port indication information, wherein:

the DMRS port indication information is used to indicate a DMRS port set, and the DMRS port set is one of a plurality of DMRS port sets;

a part of the plurality of DMRS port sets are first DMRS port sets, and DMRS ports comprised in each first DMRS port set belong to two code domain multiplexing (CDM) groups; and

another part of the plurality of DMRS port sets are second DMRS port sets, and at least one DMRS port comprised in each second DMRS port set belongs to a same CDM group;

determining quasi-co-location (QCL) indication information, wherein the QCL indication information indicates two pieces of QCL information, the two pieces of QCL information comprising a first piece of QCL information and a second piece of QCL information, wherein:

when the DMRS port set indicated by the DMRS port indication information is a first DMRS port set, the two pieces of QCL information in each precoding resource group (PRG) indicate a reception of a DMRS and data of a corresponding PRG, a DMRS port belonging to a first CDM group is associated with the first piece of QCL information, a DMRS port belonging to a second CDM group is associated with the second piece of QCL information, and

when the DMRS port set indicated by the DMRS port indication information is a second DMRS port set, one of the two pieces of QCL information is associated with reception of a DMRS and corresponding data in each PRG, wherein different pieces of QCL information are used to receive DMRSs and corresponding data in adjacent PRGs; and

sending the DMRS port indication information and the QCL indication information.

22. A non-transitory computer-readable storage medium, wherein the non-transitory computer-readable storage medium stores computer-executable instructions that, when executed by a computer, cause the computer to perform operations comprising:

receiving demodulation reference signal (DMRS) port indication information, wherein:

the DMRS port indication information is used to indicate a DMRS port set, and the DMRS port set is one of a plurality of DMRS port sets;

a part of the plurality of DMRS port sets are first DMRS port sets, and DMRS ports comprised in each first DMRS port set belong to two code domain multiplexing (CDM) groups; and

another part of the plurality of DMRS port sets are second DMRS port sets, and at least one DMRS port comprised in each second DMRS port set belongs to a same CDM group;

receiving quasi-co-location (QCL) indication information, wherein the QCL indication information indicates two pieces of QCL information, the two pieces of QCL information comprising a first piece of QCL information and a second piece of QCL information, wherein:

when the DMRS port set indicated by the DMRS port indication information is a first DMRS port set, the two pieces of QCL information in each precoding resource group (PRG) indicate a reception of a DMRS and data of a corresponding PRG, a DMRS port belonging to a first CDM group is associated with the first piece of QCL information, a DMRS port belonging to a second CDM group is associated with the second piece of QCL information, and

when the DMRS port set indicated by the DMRS port indication information is a second DMRS port set, one of the two pieces of QCL information is associated with reception of a DMRS and corresponding data in each PRG, wherein different pieces of QCL information are used to receive DMRSs and corresponding data in adjacent PRGs; and

receiving the DMRS and corresponding data.