Patent ID: 8634366

Claim:
A method for a transmission device transmitting a transport block, the method comprising: attaching a first cyclic redundancy check (CRC) to the transport block; segmenting the first CRC-attached transport block into a specific number of code blocks; attaching a second CRC to each of the specific number of code blocks; mapping the second CRC-attached code blocks to first number of layers for initial transmission of the transport block and mapping the second CRC-attached code blocks to a second number of layers for retransmission of the transport block; and transmitting the layer-mapped code blocks to a reception device, wherein: the specific number is a multiple of a least common multiple of the first number and the second number; the first number and the second number are different from each other; the second CRC-attached code blocks are mapped to the first number of layers such that each of the first number of layers includes a first number of second CRC-attached code blocks; and the second CRC-attached code blocks are mapped to the second number of layers such that each of the second number of layers includes a second number of second CRC-attached code blocks.