Data retransmission decoding method, apparatus and system, and communication device

A data retransmission decoding method, wherein the method is applied to a data sending unit, and the method comprises:

• receiving check state information of a code block based on new transmission decoding data sent by a decoding unit;
• determining a decoding parameter according to the check state information of the code block;
• and
• sending the decoding parameter to the decoding unit, for the decoding unit to decode and check retransmitted data to be decoded according to the decoding parameter.

A communication device, comprising a processor, a memory and a computer program stored on the memory and capable of running on the processor to implement a data retransmission decoding method applied to a decoding unit, and the method comprises:

• obtaining retransmitted data to be decoded, the retransmitted data to be decoded comprising a code block to be decoded;
• judging whether the code block to be decoded comprises a target code block required to be decoded again according to stored check state information of a code block decoded last time;
• and
• merging and decoding a currently stored first code block and the target code block based on a predetermined decoding parameter if the code block to be decoded comprises the target code block required to be decoded again, wherein the first code block is a code block corresponding to the target code block.