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:

• receiving downlink control information;
• obtaining a modulation and coding scheme (MCS) index in a first MCS table based on the downlink control information, wherein
• the first MCS table comprises N MCS indexes, the first MCS table comprising a value that is a product of a code rate and 1024 and that corresponds to an MCS index X in the N MCS indexes, with the value being less than or equal to a first threshold, and the first threshold being 119, wherein X is an integer greater than or equal to 0, N is a positive integer, and N is greater than or equal to X, and wherein:
• the value corresponding to the MCS index X comprises 30, 40, 50, 64, 78, or 99, and the MCS index X corresponds to a modulation scheme of quadrature phase shift keying (QPSK), and a modulation order 2;
• or
• the value corresponding to the MCS index X comprises 60, 80, or 100, and the MCS index X corresponds to a modulation scheme of binary phase shift keying (BPSK), and a modulation order 1;
• 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:

• determining a modulation and coding scheme (MCS) index in a first MCS table, wherein the first MCS table comprises N MCS indexes, the first MCS table comprising a value that is a product of a code rate and 1024 and that corresponds to an MCS index X in the N MCS indexes, with the value being less than or equal to a first threshold, and the first threshold being 119, wherein X is an integer greater than or equal to 0, N is a positive integer, and N is greater than or equal to X;
• sending the MCS index to a terminal device;
• and
• performing communication with the terminal device using the MCS index;
• and
• wherein:
• the value corresponding to the MCS index X comprises 30, 40, 50, 64, 78, or 99, and the MCS index X corresponds to a modulation scheme of quadrature phase shift keying (QPSK), and a modulation order 2;
• or
• the value corresponding to the MCS index X comprises 60, 80, or 100, and the MCS index X corresponds to a modulation scheme of binary phase shift keying (BPSK), and a modulation order 1.