Control information sending method and receiving method, base station, and terminal

1. A method of sending control information, the method being applied to a base station and comprising:

acquiring an index, in a preset Demodulation Reference Signal (DMRS) configuration table, of DMRS configuration information of a physical downlink shared channel; and

sending the index to a terminal through downlink control information;

wherein acquiring the index, in the present DMRS configuration table, of the DMRS configuration information of the physical downlink shared channel, comprises:

acquiring, from the preset DMRS configuration table, the index corresponding to the DMRS configuration information that meets a configuration condition of the terminal, wherein the DMRS configuration information comprises the total number of ports and total port numbers and the configuration condition comprises the number of Transmission Reception Points (TRP) currently supported by the terminal and the number of ports supported by each TRP.

2. The method according to claim 1 , wherein acquiring, from the preset DMRS configuration table, the index corresponding to the DMRS configuration information that meets the configuration condition of the terminal, comprises:

acquiring, from the preset DMRS configuration table, an index corresponding to the DMRS configuration information that matches each TRP in single-point transmission currently supported by the terminal; wherein the total number of ports comprised in each piece of configuration information does not exceed the number of ports supported by the TRP corresponding to the DMRS configuration information.

3. The method according to claim 1 , wherein acquiring, from the preset DMRS configuration table, the index corresponding to the DMRS configuration information that meets the configuration condition of the terminal, comprises:

acquiring, from the preset DMRS configuration table, an index corresponding to the DRMS configuration information in which the number of TRPs comprised in multi-point transmission matches the number of TRPs for the terminal, and the total number of ports does not exceed the total number of ports supported by the terminal.

4. The method according to claim 3 , wherein the DMRS configuration table further comprises a port number and the number of ports allocated for each TRP; wherein any two port numbers among port numbers of different TRPs are non-code-division multiplexed and non-time-domain orthogonal cover codes.

5. The method according to claim 1 , wherein sending the index to the terminal through the downlink control information comprises:

sending the index and indication information to the terminal through the downlink control information, wherein the indication information is configured to indicate a TRP type of a TRP corresponding to the index, and the TRP type is single-point transmission or multi-point transmission.

6. The method according to claim 1 , wherein the index comprises a first-level index and a second-level index corresponding to the first-level index;

the first-level index is an index associated with the total number of ports in the DMRS configuration table;

the second-level index is an index associated with a port number in the DMRS configuration table.

7. The method according to claim 1 , wherein sending the index to the terminal through the downlink control information comprises:

encapsulating the index in a preset field of the downlink control information, and sending the index to the terminal through the downlink control information; or

adding a preset field for the index in the downlink control information, and sending the index to the terminal through the downlink control information.

8. The method according to claim 1 , wherein sending the index to the terminal through the downlink control information, comprises:

encapsulating, in a preset field of the downlink control information, the index in a preset character format, and

sending the index to the terminal through the downlink control information.

9. A base station, comprising:

a first storage, a first processor, and a computer program stored on the first storage and executable by the first processor; wherein when the first processor executes the program, the first processor implements the method according to claim 1 .

10. A method of receiving control information, the method being applied to a terminal and comprising:

acquiring an index, carried in downlink control information, of Demodulation Reference Signal (DMRS) configuration information for a physical downlink shared channel in a preset DMRS configuration table; and

searching DMRS configuration information, indicated by the index, in the DMRS configuration table,

wherein the index is acquired by a base station from the preset DMRS configuration table,

the index corresponding to the DMRS configuration information that meets a configuration condition of the terminal, wherein the DMRS configuration information comprises the total number of ports and total port numbers and the configuration condition comprises the number of Transmission Reception Points (TRP) currently supported by the terminal and the number of ports supported by each TRP.

11. The method according to claim 10 , wherein searching the DMRS configuration information, indicated by the index, in the DMRS configuration table comprises:

determining a Transmission Reception Point (TRP) type of a TRP corresponding to the index, wherein the TRP type comprises single-point transmission and multi-point transmission; and

searching, in the preset DMRS configuration table, the DMRS configuration information indicated by the index under the TRP type of the TRP corresponding to the index.

12. The method according to claim 11 , wherein, searching, in the preset DMRS configuration table, the DMRS configuration information indicated by the index under the TRP type of the TRP corresponding to the index comprises:

in a case that the TRP type of the index is the single-point transmission, searching, in the preset DMRS configuration table, the number of ports and port numbers corresponding to the TRP of the single-point transmission indicated by the index under the type of the single-point transmission.

13. The method according to claim 11 , wherein searching, in the preset DMRS configuration table, the DMRS configuration information indicated by the index under the TRP type of the TRP corresponding to the index comprises:

in a case that the TRP type is the multi-point transmission, searching, in the preset DMRS configuration table, the number of TRPs of the multi-point transmission indicated by the index and the number of ports supported by each TRP under the type of the multi-point transmission.

14. The method according to claim 13 , wherein , the DMRS configuration table further comprises port numbers and the number of ports allocated for each TRP; wherein any two of the port numbers of different TRPs are non-code-division multiplexed and non-time domain orthogonal cover codes.

15. The method according to claim 11 , wherein determining a TRP type of a TRP corresponding to the index, comprises:

determining the TRP type of the TRP corresponding to the index based on indication information carried in the downlink control information and used for indicating the TRP type of the TRP corresponding to the index; or

determining the TRP type of the TRP corresponding to the index based on Quasi Co-Location information carried in the downlink control information.

16. The method according to claim 10 , wherein the index comprises a first-level index and a second-level index corresponding to the first-level index;

the first-level index is an index associated with the total number of ports in the DMRS configuration table;

the second-level index is an index associated with port numbers in the DMRS configuration table.

17. The method according to claim 10 , wherein acquiring the index, carried in the downlink control information, of DMRS configuration information for the physical downlink shared channel in the preset DMRS configuration table comprises:

acquiring, from a preset field in the downlink control information, the index of the DMRS configuration information for the physical downlink shared channel in the preset DMRS configuration table; or

acquiring bytes added with a preset field in the downlink control information, wherein the bytes added with the preset field are the index of the DMRS configuration information for the physical downlink shared channel in the preset DMRS configuration table.

18. The method according to claim 10 , wherein acquiring the index, carried in the downlink control information, of the DMRS configuration information for the physical downlink shared channel in the preset DMRS configuration table comprises:

acquiring a field having a preset character format from a preset field in the downlink control information, wherein the field having the preset character format is the index of the DMRS configuration information for the physical downlink shared channel in the preset DMRS configuration table.

19. A terminal, comprising:

a second storage, a second processor, and a computer program stored on the second storage and executable by the second processor; wherein when the second processor executes the program, the second processor implements the method according to claim 10 .