Method and apparatus for transmitting uplink data in a wireless access system
A method of channel coding for transmitting data in a wireless access system includes: calculating a number C of code blocks by an equation of C=┌B/(Z−L)┐, wherein B denotes a size of an input bit sequence, wherein Z denotes a maximum size of the code blocks, and wherein L denotes a size of a cyclic redundancy check (CRC) which is to be attached to each of the code blocks; calculating a size B′ of a modified input bit sequence by an equation of B′=B+C*L; generating the code blocks based on the number C of the code blocks and the size B′ of the modified input bit sequence; and channel-coding the code blocks.
1. A method for transmitting data in a wireless access system, the method comprising:
receiving a first sequence including a first cyclic redundancy check (CRC);
obtaining a number C of code blocks by considering a size L of second CRCs to be attached, the number C being determined based on a size B of the first sequence, a maximum size Z of code blocks, and the size L of the second CRCs;
obtaining a size B′ of a modified first sequence by using the number C, the size B and the size L;
obtaining sizes of the code blocks based on the size B′ and the number C;
segmenting the first sequence into second sequences based on the number C and the sizes of the code blocks;
generating the second CRCs by using each of the second sequences, wherein a size of each of the second sequences corresponds to a bit size except for the size L of the second CRCs from each of the sizes of the code blocks;
attaching each of the second CRCs to each of the second sequences; and
transmitting the data using the code blocks.
2. The method according to claim 1 , wherein the obtaining the number C is performed when the size B of the first sequence is larger than the maximum size Z of the code blocks.
3. The method according to claim 1 , wherein the size L of the second CRC is 24 bits and the maximum size Z of the code blocks is 6144 bits.
4. An apparatus for transmitting data in a wireless access system, the apparatus comprising:
a block segmentation and cyclic redundancy check (CRC) attaching unit,
wherein the block segmentation and CRC attaching unit is configured to:
receive a first sequence including a first CRC;
obtain a number C of code blocks by considering a size L of second CRCs to be attached, the number C being determined based on a size B of the first sequence, a maximum size Z of code blocks, and the size L of the second CRCs;
obtain a size B′ of a modified first sequence by using the number C, the size B and the size L;
obtain sizes of the code blocks based on the size B′ and the number C;
segment the first sequence into second sequences based on the number C and the sizes of the code blocks;
generate the second CRCs by using each of the second sequences, the size of each of the second sequences corresponding to a bit size except for the size L of the second CRCs from each of the sizes of the code blocks; and
attach each of the second CRCs to each of the second sequences,
wherein the apparatus is configured to transmit the data using the code blocks.
5. The apparatus according to claim 4 , wherein the number C is calculated when the size B of the first sequence is larger than the maximum size Z of the code blocks.
6. The apparatus according to claim 4 , wherein the size L of the second CRC is 24 bits and the maximum size Z of the code blocks is 6144 bits.