Data Transmission Method, Device, and System

A data transmission method, comprising:

• obtaining, by a network device, a quantity of physical resource blocks (PRBs) occupied by first data carried in a first subframe, wherein the first data is from the network device to user equipment;
• determining, by the network device, a first transport block size (TBS) or a second TBS according to the quantity of PRBs occupied by the first data carried in the first subframe, wherein the second TBS comprises a TBS in the first subframe and a TBS in a second subframe;
• performing, by the network device according to the first TBS or the second TBS, modulation and coding on the first data carried in the first subframe and first data carried in the second subframe, wherein the first subframe and the second subframe are adjacent subframes;
• and
• sending, by the network device, the first subframe and the second subframe to the user equipment, wherein the first subfrarne is sent after the second subframe, wherein the first subframe comprises M orthogonal frequency division multiplexing (OFDM) symbols, wherein the second subframe comprises N OFDM symbols, wherein M and N are positive integers, and wherein M≧N.

A data transmission method, comprising:

• receiving, by user equipment, a first subframe and a second subframe adjacent to each other from a network device, wherein the first subframe is sent after the second subframe, wherein the first subframe comprises M orthogonal frequency division multiplexing (OFDM) symbols, wherein the second subframe comprises N OFDM symbols, wherein M and N are positive integers, and wherein M≧N;
• obtaining, by the user equipment, a quantity of physical resource blocks (PRBs) occupied by first data carried in the first subframe, wherein the first data is from the network device to the user equipment;
• determining, by the user equipment, a first transport block size (TBS) or a second TBS according to the quantity of PRBs occupied by the first data carried in the first subframe, wherein the second TBS comprises a TBS in the first subframe and a TBS in the second subframe;
• and
• performing, by the user equipment according to the first TBS or the second TBS, demodulation and decoding on the first data carried in the first subframe and first data carried in the second subframe.

User equipment, comprising:

• a processor;
• a memory;
• a bus;
• and
• a receiver,
• wherein the processor, the memory, and the receiver are connected to each other using the bus,
• wherein the receiver is configured to receive a first subframe and a second subframe adjacent to each other from a network device, wherein the first subframe is sent after the second subframe, wherein the first subframe comprises M orthogonal frequency division multiplexing (OFDM) symbols, wherein the second subframe comprises N OFDM symbols, wherein M and N are positive integers, and wherein M≧N, and
• wherein the processor is configured to:
• obtain a quantity of physical resource blocks (PRBs) occupied by first data carried in the first subframe, wherein the first data is from the network device to the user equipment;
• determine a first transport block size (TBS) or a second TBS according to the quantity of PRBs occupied by the first data carried in the first subframe, wherein the second TBS comprises a TBS in the first subframe and a TBS in the second subframe;
• and
• perform, according to the first TBS or the second TBS, demodulation and decoding on the first data carried in the first subframe and first data carried in the second subframe.