Polar code retransmission method and apparatus

A polar code retransmission apparatus, comprising:

• at least one non-transitory memory, configured to store instructions;
• at least one processor, which upon execution of the instructions, is enabled to:
• perform polar code encoding on K first to-be-encoded bits based on a first construction parameter to obtain a first code word, wherein the first construction parameter comprises a first information bit position set, elements in the first information bit position set are used to indicate positions of the K first to-be-encoded bits, and K is a positive integer;
• send the first code word to a decoding device;
• receive, from the decoding device, information used to indicate that decoding of the first code word fails;
• perform polar code encoding on the K first to-be-encoded bits and K′ second to-be-encoded bits based on a second construction parameter to obtain a second code word, wherein K′ is a positive integer, the second construction parameter comprises a second information bit position set, elements in the second information bit position set are used to indicate positions of the K first to-be-encoded bits and positions of the K′ second to-be-encoded bits, an element that is in the second information bit position set and that is used to indicate a position of a first to-be-encoded bit is a sum of N and an element that is in the first information bit position set and that is used to indicate the position of the first to-be-encoded bit, N is a length of a mother code obtained through encoding during initial transmission, and N is an integer power of 2;
• and
• send a subcode in the second code word other than the first code word to the decoding device.

A non-transitory computer-readable storage medium, wherein the computer-readable storage medium stores computer-readable instructions, wherein when the computer-readable instructions are run on a computer, the computer is enabled to:

• perform polar code encoding on K first to-be-encoded bits based on a first construction parameter to obtain a first code word, wherein the first construction parameter comprises a first information bit position set, elements in the first information bit position set are used to indicate positions of the K first to-be-encoded bits, and K is a positive integer;
• send the first code word to a decoding device;
• receive, from the decoding device, information used to indicate that decoding of the first code word fails;
• perform polar code encoding on the K first to-be-encoded bits and K′ second to-be-encoded bits based on a second construction parameter to obtain a second code word, wherein K′ is a positive integer, the second construction parameter comprises a second information bit position set, elements in the second information bit position set are used to indicate positions of the K first to-be-encoded bits and positions of the K′ second to-be-encoded bits, an element that is in the second information bit position set and that is used to indicate a position of a first to-be-encoded bit is a sum of N and an element that is in the first information bit position set and that is used to indicate the position of the first to-be-encoded bit, N is a length of a mother code obtained through encoding during initial transmission, and N is an integer power of 2;
• and
• send a subcode in the second code word other than the first code word to the decoding device.