Retransmission method and apparatus

A sending device, comprising:

• at least one processor;
• and
• at least one non-transitory memory having instructions stored thereon that, when executed by the at least one processor, wherein cause the sending device to:
• obtain a to-be-encoded bit sequence comprising K to-be-encoded bits, wherein K is a positive integer;
• perform polar encoding on the to-be-encoded sequence to obtain an encoded first bit sequence, wherein a length of the first bit sequence is N0;
• determine an initial transmission version RV0 and a length E1 of a retransmission version RV1;
• determine the retransmission version RV1 based on an initial transmission bit rate R0;
• and
• send the RV1,
• wherein an incremental redundancy (IR) manner is used for first retransmission, and a chase combining (CC) manner is used for subsequent retransmission.

A retransmission method, comprising:

• receiving, by a receiving apparatus, a received signal comprising information of K to-be-encoded bits, wherein a mother code length corresponding to the received signal is N0;
• determining an initial transmission version RV0;
• determining a length E1 of a retransmission version RV1;
• determining the retransmission version RV1 based on an initial transmission code rate R0;
• and
• performing decoding based on the RV0 and the RV1,
• wherein an incremental redundancy (IR) manner is used for first retransmission, and a chase combining (CC) manner is used for subsequent retransmission.

A receiving device comprising:

• at least one processor;
• and
• at least one non-transitory memory having instructions stored thereon that, when executed by the at least one processor, cause the receiving device to:
• receive a received signal comprising information about K to-be-encoded bits, wherein a mother code length corresponding to the received signal is N0;
• determine an initial transmission version RV0;
• determine a length E1 of a retransmission version RV1;
• determine the retransmission version RV1 based on an initial transmission bit rate R0;
• and
• perform decoding based on the RV0 and the RV1,
• wherein an incremental redundancy (IR) manner is used for first retransmission, and a chase combining (CC) manner is used for subsequent retransmission.