Communication method, MCS receiving method, MCS notification method, and device

A communications apparatus, comprising at least one processor, wherein the at least one processor is coupled to a memory, and the at least one processor executes instructions stored in the memory, to enable the communications apparatus to perform following:

• obtaining modulation and coding scheme (MCS) tables including a first MCS table and a second MCS table;
• receiving downlink control information;
• obtaining a MCS index in the first MCS table based on the downlink control information, wherein
• the first MCS table comprises N MCS indexes, each of the N MCS indexes corresponding to a value that is a product of a code rate and 1024, wherein N is a positive integer, and the first MCS table comprises all entries of the second MCS table excluding entries corresponding to a plurality of MCS indexes in the second MCS table, and the plurality of MCS indexes comprise an MCS index 25, an MCS index 26, an MCS index 27, and an MCS index 28, wherein a value that is a product of a code rate and 1024 and that corresponds to each of the MCS index 25, the MCS index 26, the MCS index 27, and the MCS index 28 in the second MCS table is higher than a value that is a product of a code rate and 1024 and that corresponds to each of the N MCS indexes in the first MCS table, and wherein:
• the value corresponding to the MCS index in the first MCS table comprises 30, 40, 50, 64, or 99, and the MCS index corresponds to a modulation scheme of quadrature phase shift keying (QPSK) and a modulation order 2, wherein the values 30, 40, 50, 64 and 99 are comprised in the first MCS table;
• or
• the value corresponding to the MCS index in the first MCS table comprises 60, 80, or 100, and the MCS index corresponds to a modulation scheme of binary phase shift keying (BPSK) and a modulation order 1, wherein the values 60, 80, and 100 are comprised in the first MCS table;
• and
• performing communication using the MCS index.

A communications apparatus, comprising at least one processor, wherein the at least one processor is coupled to a memory, and the processor executes instructions stored in the memory, to enable the communications apparatus to perform the following:

• obtaining modulation and coding scheme (MCS) tables including a first MCS table and a second MCS table;
• determining a MCS index in the first MCS table for communication with a terminal device, wherein the first MSC table comprises N MCS indexes, each of the N MCS indexes corresponding to a value that is a product of a code rate and 1024, the first MCS table comprises all entries of the second MCS table excluding entries corresponding to a plurality of MCS indexes in the second MCS table, and the plurality of MCS indexes comprise an MCS index 25, an MCS index 26, an MCS index 27, and an MCS index 28, wherein a value that is a product of a code rate and 1024 and that corresponds to each of the MCS index 25, the MCS index 26, the MCS index 27, and the MCS index 28 in the second MCS table is higher than a value that is a product of a code rate and 1024 and that corresponds to each of the N MCS indexes in the first MCS table, and N is a positive integer;
• sending the MCS index to the terminal device;
• and
• performing communication with the terminal device using the MCS index;
• and wherein:
• the value corresponding to the MCS index in the first MCS table comprises 30, 40, 50, 64, or 99, and the MCS index corresponds to a modulation scheme of quadrature phase shift keying (QPSK) and a modulation order 2, wherein the values 30, 40, 50, 64 and 99 are comprised in the first MCS table;
• or
• the value corresponding to the MCS index in the first MCS table comprises 60, 80, or 100, and the MCS index corresponds to a modulation scheme of binary phase shift keying (BPSK) and a modulation order 1, wherein the values 60, 80, and 100 are comprised in the first MCS table.