Data sending method, data receiving method, and communication apparatus

An apparatus, comprising at least one processors, configured to execute instructions stored in a memory to cause the apparatus to perform operations comprising:

• obtaining a position mapping relationship between N sub-PDUs comprised in a medium access control protocol data unit (MAC PDU) carried by a first transport block (TB) and data parts of a plurality of code blocks (CBs), wherein the plurality of CBs are obtained by dividing a second TB, and each of the plurality of CBs comprises header information and a data part;
• generating the second TB based on the position mapping relationship and the first TB;
• and
• sending the second TB, wherein
• the plurality of CBs comprise a first CB, header information of the first CB indicates a position of a data part of the first CB in the MAC PDU, or the header information of the first CB indicates a position correspondence between the data part of the first CB and M sub-PDUs in the N sub-PDUs, both N and M are integers, N≥1, M≥1, and M is less than or equal to N.

A data receiving method, comprising:

• receiving a transport block (TB) from a transmitting end, wherein there is a position mapping relationship between data parts in a plurality of code blocks (CBs) obtained by dividing the TB and N sub-PDUs comprised in a medium access control protocol data unit (MAC PDU), N≥1, and N is an integer;
• wherein
• the plurality of CBs comprise a first CB, header information of the first CB indicates a position of a data part of the first CB in the MAC PDU, or the header information of the first CB indicates a position correspondence between the data part of the first CB and M sub-PDUs in the N sub-PDUs, M≥1, M is an integer, and M is less than or equal to N;
• and
• obtaining one or more complete sub-PDUs of the MAC PDU based on the position mapping relationship.