Method and apparatus for transmitting modulation and coding scheme MCS indication information and communication device

1 . A method for transmitting modulation and coding scheme (MCS) indication information, performed by a first communication device, comprising:

in a case that a second communication device is capable of supporting 1024 quadrature amplitude modulation (QAM), transmitting first indication information, second indication information, and third indication information to the second communication device; wherein

the first indication information is used to indicate a modulation and coding scheme (MCS) table used for the second communication device to perform data transmission, and the MCS table comprises an MCS level corresponding to a modulation scheme with a modulation order of 10;

the second indication information is used to indicate a channel quality indicator (CQI) table used for the second communication device to perform CQI feedback, and the CQI table comprises a CQI level corresponding to the 1024QAM modulation scheme; and

the third indication information is used for determining, according to the MCS table, an MCS level corresponding to a channel received by the second communication device;

wherein the MCS table comprises a first MCS level, a second MCS level, a third MCS level, a fourth MCS level, and a fifth MCS level that is for retransmission, wherein the MCS levels correspond to the modulation scheme with a modulation order of 10;

wherein a target code rate corresponding to the first MCS level is 805.5, and spectral efficiency corresponding to the first MCS level is 7.8662;

wherein a target code rate corresponding to the second MCS level is 853, and spectral efficiency corresponding to the second MCS level is 8.3301;

wherein a target code rate corresponding to the third MCS level is 900.5, and spectral efficiency corresponding to the third MCS level is 8.7939;

and wherein a target code rate corresponding to the fourth MCS level is 948, and spectral efficiency corresponding to the fourth MCS level is 9.2578.

2 . The method according to claim 1 , wherein the MCS table satisfies at least one of the following:

the MCS table comprises code rates and spectral efficiencies in the CQI table;

the MCS table comprises MCS levels corresponding to 256QAM in a first MCS table, wherein the first MCS table is an MCS table comprising MCS levels corresponding to 256QAM;

spectral efficiencies corresponding to MCS levels are at equal intervals;

target code rates corresponding to MCS levels are at equal intervals;

signal-to-noise ratios corresponding to MCS levels are at equal intervals; or

the spectral efficiency is rounded to four decimal places.

3 . A method for transmitting-receiving modulation and coding scheme (MCS) indication information, performed by a second communication device, comprising:

in a case that the second communication device is capable of supporting 1024 quadrature amplitude modulation (QAM), receiving first indication information, second indication information, and third indication information that are transmitted by a first communication device; wherein

the first indication information is used to indicate a modulation and coding scheme (MCS) table used for the second communication device to perform data transmission, and the MCS table comprises an MCS level corresponding to a modulation scheme with a modulation order of 10;

the second indication information is used to indicate a CQI table used for the second communication device to perform channel quality indicator CQI feedback, and the CQI table comprises a CQI level corresponding to the 1024QAM modulation scheme; and

the third indication information is used for determining, according to the MCS table, an MCS level corresponding to a channel received by the second communication device;

wherein the MCS table comprises a first MCS level, a second MCS level, a third MCS level, a fourth MCS level, and a fifth MCS level that is for retransmission, wherein the MCS levels correspond to the modulation scheme with a modulation order of 10;

wherein the target code rate corresponding to the first MCS level, multiplied by 1024, is 805.5, and spectral efficiency corresponding to the first MCS level is 7.8662;

wherein the target code rate corresponding to the second MCS level, multiplied by 1024, is 853, and spectral efficiency corresponding to the second MCS level is 8.3301;

wherein the target code rate corresponding to the third MCS level, multiplied by 1024, is 900.5, and spectral efficiency corresponding to the third MCS level is 8.7939; and

wherein the target code rate corresponding to the fourth MCS level, multiplied by 1024, is 948, and spectral efficiency corresponding to the fourth MCS level is 9.2578.

4 . The method according to claim 3 , wherein the MCS table satisfies at least one of the following:

the MCS table comprises code rates and spectral efficiencies in the CQI table;

the MCS table comprises MCS levels corresponding to 256QAM in a first MCS table, wherein the first MCS table is an MCS table comprising MCS levels corresponding to 256QAM;

spectral efficiencies corresponding to MCS levels are at equal intervals;

target code rates corresponding to MCS levels are at equal intervals;

signal-to-noise ratios corresponding to MCS levels are at equal intervals; or

the spectral efficiency is rounded to four decimal places.

5 . A communication device, comprising a processor, a memory, and a program or instructions stored in the memory and capable of running on the processor, wherein when the program or instructions are executed by the processor, the communication device implements:

in a case that a second communication device is capable of supporting 1024 quadrature amplitude modulation (QAM), transmitting first indication information, second indication information, and third indication information to the second communication device; wherein

the first indication information is used to indicate a modulation and coding scheme (MCS) table used for the second communication device to perform data transmission, and the MCS table comprises an MCS level corresponding to a modulation scheme with a modulation order of 10;

the second indication information is used to indicate a channel quality indicator (CQI) table used for the second communication device to perform CQI feedback, and the CQI table comprises a CQI level corresponding to the 1024QAM modulation scheme; and

the third indication information is used for determining, according to the MCS table, an MCS level corresponding to a channel received by the second communication device;

wherein the MCS table comprises a first MCS level, a second MCS level, a third MCS level, a fourth MCS level, and a fifth MCS level that is for retransmission, wherein the MCS levels correspond to the modulation scheme with a modulation order of 10;

wherein a target code rate corresponding to the first MCS level is 805.5, and spectral efficiency corresponding to the first MCS level is 7.8662;

wherein a target code rate corresponding to the second MCS level is 853, and spectral efficiency corresponding to the second MCS level is 8.3301;

wherein a target code rate corresponding to the third MCS level is 900.5, and spectral efficiency corresponding to the third MCS level is 8.7939;

and wherein a target code rate corresponding to the fourth MCS level is 948, and spectral efficiency corresponding to the fourth MCS level is 9.2578.

6 . The method according to claim 1 , wherein the MCS table applies to:

physical downlink shared channel (PDSCH) scheduled by physical downlink control channel (PDCCH) of a first downlink control information format for which cyclic redundancy check (CRC) is scrambled by cell radio network temporary identifier (C-RNTI) or configured scheduling CS-RNTI.

7 . The method according to claim 6 , wherein the first downlink control information format is a DCI format1_1.

8 . The method according to claim 1 , wherein the MCS table applies to:

PDSCH scheduled by PDCCH of a second DCI format for which CRC is scrambled by C-RNTI or CS-RNTI.

9 . The method according to claim 1 , wherein the first indication information and the second indication information are transmitted via higher layer signaling, and the third indication information is transmitted via indication information in downlink control information (DCI).

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

receiving fourth indication information reported by the second communication device, wherein the fourth indication information is used to indicate whether the second communication device is capable of supporting 1024QAM.

11 . The method according to claim 3 , wherein the MCS table applies to:

physical downlink shared channel (PDSCH) scheduled by physical downlink control channel (PDCCH) of a first downlink control information format for which cyclic redundancy check (CRC) is scrambled by cell radio network temporary identifier (C-RNTI) or configured scheduling CS-RNTI.

12 . The method according to claim 11 , wherein the first downlink control information format is a DCI format1_1.

13 . The method according to claim 3 , wherein the MCS table applies to:

PDSCH scheduled by PDCCH of a second DCI format for which CRC is scrambled by C-RNTI or CS-RNTI.

14 . The method according to claim 3 , wherein the first indication information and the second indication information are transmitted via higher layer signaling, and the third indication information is transmitted via indication information in downlink control information DCI.

15 . The method according to claim 3 , wherein the method further comprises:

transmitting fourth indication information reported by the second communication device, wherein the fourth indication information is used to indicate whether the second communication device is capable of supporting 1024QAM.

16 . The method according to claim 15 , wherein the fourth indication is reported with any one of the following granularities:

per band;

per band combination; and

per feature set per component-carrier (FSPC).

17 . The communication device according to claim 5 , wherein the MCS table satisfies at least one of the following:

the MCS table comprises code rates and spectral efficiencies in the CQI table;

the MCS table comprises MCS levels corresponding to 256QAM in a first MCS table, wherein the first MCS table is an MCS table comprising MCS levels corresponding to 256QAM;

spectral efficiencies corresponding to MCS levels are at equal intervals;

target code rates corresponding to MCS levels are at equal intervals;

signal-to-noise ratios corresponding to MCS levels are at equal intervals; or

the spectral efficiency is rounded to four decimal places.

18 . The communication device according to claim 5 , wherein the MCS table applies to:

physical downlink shared channel (PDSCH) scheduled by physical downlink control channel (PDCCH) of a first downlink control information format for which cyclic redundancy check (CRC) is scrambled by cell radio network temporary identifier (C-RNTI) or configured scheduling CS-RNTI.

19 . The communication device according to claim 18 , wherein the first downlink control information format is a DCI format1_1.

20 . The communication device according to claim 5 , wherein the first indication information and the second indication information are transmitted via higher layer signaling, and the third indication information is transmitted via indication information in downlink control information (DCI).