Data transmission method, terminal device, and network device

An apparatus, comprising:

• a memory storing program instructions;
• and
• at least one processor coupled to the memory, wherein the program instructions, when executed by the at least one processor, cause the apparatus to:
• receive first information from a network device, wherein the first information is used to instruct a first terminal device to transmit same to-be-sent data of a same packet data convergence protocol (PDCP) entity by using n logical channels, and the first information comprises a destination address identifier of the to-be-sent data and n carrier identifiers corresponding to the n logical channels, wherein n is a positive integer greater than 1;
• encapsulate n pieces of data of the n logical channels respectively into n media access control (MAC) protocol data units (PDUs) based on the first information, wherein the n pieces of data all comprise the to-be-sent data;
• and
• send the n MAC PDUs to a second terminal device through a straight-through link, wherein the n MAC PDUs use n carriers respectively.