Information transmission method and device
An information transmission method and device includes: reporting, by a UE, a CQI value to an eNB; receiving, by the UE, an MCS value sent by the eNB, where the MCS value is determined by the eNB according to the CQI value; and receiving, by the UE, PDSCH data according to the MCS value, where the CQI value and the MCS value are determined according to a second set of tables, where a modulation scheme that can be supported by the second set of tables is higher than 64 QAM.
1. An information transmission method, comprising:
receiving, by an eNodeB (eNB), a first control signaling from a user equipment (UE), wherein the first control signaling indicates the UE supports a second set of tables including a second modulation and coding scheme (MCS) table and a second channel quality indicator (CQI) table, and wherein a modulation scheme that can be supported by the second set of tables is higher than 64 QAM, wherein the UE also supports a first set of tables including a first MCS table different from the second MCS table and a first CQI table different from the second CQI table;
wherein spectral efficiency in the second CQI table meets the following condition:
in any modulation scheme whose modulation order is higher than 2, differences between two adjacent spectral efficiency values are approximately equal, wherein a being approximately equal to b means that an absolute value of a difference between a and b is less than a set value;
sending, by the eNB, a second control signaling to the UE, wherein the second control signaling is used to indicate use of the second set of tables;
receiving, by the eNB, a CQI value from the UE, wherein the CQI value is determined by the UE by using the second CQI table;
determining, by the eNB, an MCS value according to the CQI value;
sending, by the eNB, the MCS value to the UE; and
sending, by the eNB, physical downlink shared channel (PDSCH) data according to the MCS value.
2. The method according to claim 1 , wherein:
some entries in the second set of tables are the same as those in the first set of tables;
a number of CQI indexes of the second CQI table is the same as in the first CQI table; and
a number of MCS indexes of the second MCS table is the same as a number of MCS indexes in the first MCS table, and wherein the second MCS table comprises MCS index entries reserved for hybrid automatic repeat request (HARQ) retransmission of a modulation scheme higher than 64 QAM.
3. The method according to claim 2 , wherein the spectral efficiency in the second CQI table further meets the following condition:
in any modulation scheme whose modulation order is equal to 2, differences between two adjacent spectral efficiency values are not approximately equal, wherein a being approximately equal to b means that an absolute value of a difference between a and b is less than a set value.
4. The method according to claim 1 , wherein the second MCS table comprises:
all modulation schemes comprised in the CQI table; and
values obtained by performing interpolation for the modulation schemes comprised in the CQI table.
5. The method according to claim 4 , wherein the second MCS table includes 5 values corresponding to quadrature phase shift keying (QPSK).
6. The method according to claim 1 , wherein the set value is 0.2.
7. The method according to claim 1 , wherein a number of CQI indexes in the second CQI table is the same as in the first CQI table, and a number of MCS indexes in the second MCS table is the same as in the first MCS table.
8. The method according to claim 7 , wherein 4 indices are required in a reserved part of the MCS table.
9. The method according to claim 1 , wherein the modulation scheme that can be supported by the second set of tables is 256 QAM.
10. An information transmission device, comprising:
a non-transitory computer-readable storage medium storing program code; and
computer hardware coupled to the non-transitory computer-readable medium and configured to execute the program code to:
receive a first control signaling from a user equipment (UE), wherein the first control signaling indicates the UE supports a second set of tables including a second modulation and coding scheme (MCS) table and a second channel quality indicator (CQI) table, wherein a modulation scheme that can be supported by the second set of tables is higher than 64 QAM. wherein the UE also supports a first set of tables including a first MCS table different from the second MCS table and a first CQI table different from the second CQI table,
wherein spectral efficiency in the second CQI table meets the following condition:
in any modulation scheme whose modulation order is higher than 2, differences between two adjacent spectral efficiency values are approximately equal, wherein a being approximately equal to b means that an absolute value of a difference between a and b is less than a set value,
send a second control signaling to the UE for indicating use of the second set of tables,
receive a CQI value from the UE, wherein the CQI value is determined by the UE by using the second CQI table,
determine an MCS value according to the CQI value,
send the MCS value to the UE, and
send physical downlink shared channel (PDSCH) data according to the MCS value.
11. The device according to claim 10 , wherein:
some entries in the second set of tables are the same as those in the first set of tables;
a number of CQI indexes of the second CQI table is the same as in the first CQI table; and
a number of MCS indexes of the second MCS table is the same as in the first CQI table, and the second MCS table comprises MCS index entries reserved for hybrid automatic repeat request (HARQ) retransmission of a modulation scheme higher than 64 QAM.
12. The device according to claim 11 , wherein the spectral efficiency in the second CQI table further meets the following condition:
in any modulation scheme whose modulation order is equal to 2, differences between two adjacent spectral efficiency values are not approximately equal, wherein a being approximately equal to b means that an absolute value of a difference between a and b is less than a set value.
13. The device according to claim 10 , wherein the set value is 0.2.
14. The device according to claim 10 , wherein the second MCS table comprises:
all modulation schemes comprised in the CQI table; and
values obtained by performing interpolation for the modulation schemes comprised in the CQI table.
15. The device according to claim 14 , wherein the second MCS table includes 5 values corresponding to quadrature phase shift keying (QPSK).
16. The device according to claim 10 , wherein a number of CQI indexes in the second CQI table is the same as in the first CQI table, and a number of MCS indexes in the second MCS table is the same as in the first MCS table.
17. The device according to claim 10 , wherein:
4 indices are required in reserved part of the MCS table.
18. The device according to claim 10 , wherein:
the modulation scheme that can be supported by the second set of tables is 256 QAM.
19. A non-transitory computer-readable medium having processor-executable instructions stored thereon, the processor-executable instructions, when executed, facilitate performance of a data transmission method comprising:
receiving a first control signaling from a user equipment (UE), wherein the first control signaling indicates that the UE supports a second set of tables including a second modulation and coding scheme (MCS) table and a second channel quality indicator (CQI) table, wherein a modulation scheme that can be supported by the second set of tables is higher than 64 QAM, wherein the UE also supports a first set of tables including a first MCS table different from the second MCS table and a first CQI table different from the second CQI table;
wherein spectral efficiency in the second CQI table meets the following condition:
in any modulation scheme whose modulation order is higher than 2, differences between two adjacent spectral efficiency values are approximately equal, wherein a being approximately equal to b means that an absolute value of a difference between a and b is less than a set value;
sending a second control signaling to the UE for indicating use of the second set of tables;
receiving a CQI value from the UE, wherein the CQI value is determined by the UE by using the second CQI table;
determining an MCS value according to the CQI value;
sending the MCS value to the UE; and
sending physical downlink shared channel (PDSCH) data according to the MCS value.
20. The non-transitory computer-readable medium according to claim 10 , wherein the set value is 0.2.