Data transmission method, base station, and terminal device

An apparatus, comprising:

• one or more processors;
• and
• a memory coupled to the one or more processors, wherein the memory stores a program to be executed by the one or more processors, the program including instructions for:
• determining a target base graph, wherein the target base graph is from N Raptor-like low-density parity-check (LDPC) base graphs, wherein a first base graph and a second base graph are any two of the N Raptor-like LDPC base graphs, wherein a quantity of columns corresponding to information bits comprised in the first base graph is different from a quantity of columns corresponding to information bits comprised in the second base graph, wherein an intersection between code lengths supported by the first base graph and code lengths supported by the second base graph is not empty, wherein an intersection between code rates supported by the first base graph and code rates supported by the second base graph is not empty, and wherein N is a positive integer greater than or equal to 2;
• and
• sending indication information to a terminal device, wherein the indication information is a modulation and coding scheme (MCS) index, and the indication information is used for the terminal device to determine the target base graph that is used for performing LDPC encoding or decoding on code blocks.