Method and apparatus for notifying channel quality indicator and modulation and coding scheme

A channel quality indicator (CQI) notifying method, comprising:

• receiving, by a base station, a first CQI index from a User Equipment (UE), wherein the first CQI index corresponds to a first entry comprising a first modulation scheme and a first spectral efficiency in a first CQI table;
• determining, by the base station, a first modulation and coding scheme (MCS) index in a first MCS table, and
• sending, by the base station, the first MCS index to the UE, wherein the first MCS index indicates a first modulation scheme;
• wherein:
• the first MCS table comprises an entry in which a modulation scheme is 256QAM;
• and
• the first CQI index is an index in the first CQI table in which modulation schemes are quadrature phase shift keying (QPSK), 16 quadrature amplitude modulation (QAM), 64QAM and 256QAM, and in which at least one CQI index corresponds to at least one entry comprising a modulation scheme and a spectral efficiency;
• wherein entries in which a modulation scheme is QPSK in the first CQI table, are part of entries that are in a second CQI table and in which a modulation scheme is QPSK, and the part of entries correspond to CQI indexes 1, 3, and 5 in the second CQI table, wherein in the second CQI table, at least one CQI index corresponds to at least one entry comprising a modulation scheme and a spectral efficiency;
• and modulation schemes in entries in the second CQI table are QPSK, 16QAM, and 64QAM, and a value range of a CQI index in the first CQI table is the same as a value range of a CQI index in the second CQI table.

An apparatus, comprising:

• one or more processors;
• a non-transitory memory for storing computer instructions that when executed by the one or more processors cause the apparatus to perform steps comprising:
• determining a first CQI index in a first CQI table in which modulation schemes are quadrature phase shift keying (QPSK), 16 quadrature amplitude modulation (QAM), 64QAM and 256QAM, and in which at least one CQI index corresponds to at least one entry comprising a modulation scheme and a spectral efficiency;
• and
• sending the first CQI index to a base station, wherein the first CQI index corresponds to a first entry comprising a first modulation scheme and a first spectral efficiency in the first CQI table;
• wherein entries in which a modulation scheme is QPSK in the first CQI table, are part of entries that are in a second CQI table and in which a modulation scheme is QPSK, and the part of entries correspond to CQI indexes 1, 3, and 5 in the second CQI table, wherein in the second CQI table, at least one CQI index corresponds to at least one entry comprising a modulation scheme and a spectral efficiency;
• and
• wherein modulation schemes in entries in the second CQI table are QPSK, 16QAM, and 64QAM, and a value range of a CQI index in the first CQI table is the same as a value range of a CQI index in the second CQI table.

An apparatus, comprising:

• one or more processors;
• a non-transitory memory for storing computer instructions that when executed by the one or more processors cause the apparatus to perform steps comprising:
• receiving a first CQI index from a User Equipment (UE), wherein the first CQI index corresponds to a first entry comprising a first modulation scheme and a first spectral efficiency in a first CQI table;
• determining a first modulation and coding scheme (MCS) index in a first MCS table, and
• sending the first MCS index to the UE, wherein the first MCS index indicates a first modulation scheme;
• wherein:
• the first MCS table comprises an entry in which a modulation scheme is 256QAM;
• and
• the first CQI index is an index in the first CQI table in which modulation schemes are quadrature phase shift keying (QPSK), 16 quadrature amplitude modulation (QAM), 64QAM and 256QAM, and in which at least one CQI index corresponds to at least one entry comprising a modulation scheme and a spectral efficiency;
• wherein entries in which a modulation scheme is QPSK in the first CQI table, are part of entries that are in a second CQI table and in which modulation schemes are QPSK, and the part of entries correspond to CQI indexes 1, 3, and 5 in the second CQI table, wherein in the second CQI table, at least one CQI index corresponds to at least one entry comprising a modulation scheme and a spectral efficiency;
• and wherein modulation schemes in entries in the second CQI table are QPSK, 16QAM, and 64QAM, and a value range of a CQI index in the first CQI table is the same as a value range of a CQI index in the second CQI table.

A non-transitory computer-readable medium comprising processor-executable instructions which, when executed by a processor of a computer, cause the computer to carry out steps comprising:

• determining a first CQI index in a first CQI table in which modulation schemes are quadrature phase shift keying (QPSK), 16 quadrature amplitude modulation (QAM), 64QAM and 256QAM, and in which at least one CQI index corresponds to at least one entry comprising a modulation scheme and a spectral efficiency;
• and
• sending the first CQI index to a base station, wherein the first CQI index corresponds to a first entry comprising a first modulation scheme and a first spectral efficiency in the first CQI table;
• wherein entries in which a modulation scheme is QPSK in the first CQI table are part of entries that are in a second CQI table and in which a modulation scheme is QPSK, and the part of entries correspond to CQI indexes 1, 3, and 5 in the second CQI table, wherein in the second CQI table, at least one CQI index corresponds to at least one entry comprising a modulation scheme and a spectral efficiency;
• and
• wherein modulation schemes in entries in the second CQI table are QPSK, 16QAM, and 64QAM, and a value range of a CQI index in the first CQI table is the same as a value range of a CQI index in the second CQI table.