Method and apparatus for transmitting uplink data in a wireless access system
A method of transmitting data in a wireless access system includes: calculating a number C of code blocks using a size B of an input bit sequence, a maximum size Z of the code blocks, and a size L 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 using the number C, the size L, and the size B; obtaining a size K of each of the code blocks using the size B′ and the number C; segmenting the input bit sequence to have the number C of the code blocks and the obtained size K of each of the code blocks; generating the code blocks by attaching the CRC to each of the segmented input bit sequences; and channel-coding the code blocks.
1. A method of transmitting data in a wireless access system, the method comprising:
calculating a number C of code blocks using a size B of an input bit sequence, a maximum size Z of the code blocks, and a size L 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 using the number C of the code blocks, the size L of the CRC, and the size B of the input bit sequence;
obtaining a size K of each of the code blocks using the size B′ of the modified input bit sequence and the number C of the code blocks;
segmenting the input bit sequence to have the number C of the code blocks and the obtained size K of each of the code blocks;
generating the code blocks by attaching the CRC to each of the segmented input bit sequences; and
channel-coding the code blocks,
wherein the number C of the code blocks is calculated as an integer by rounding up a value obtained by dividing the size B of the input bit sequence by a result of subtracting the size L of the CRC from the maximum size Z of the code blocks such that C=┌B/(Z−L)┐.
2. The method according to claim 1 , wherein the size L of the CRC is 24 bits.
3. The method according to claim 1 ,
wherein the CRC is attached to each of the code blocks to detect whether each of the code blocks contains errors.
4. The method according to claim 1 ,
wherein the number C of the code blocks is set to 1 if the size B of the input bit sequence is less than the maximum size Z of the code blocks.
5. The method according to claim 1 ,
wherein the size B′ of the modified input bit sequence is set to a value obtained by adding the size B of the input bit sequence to a result of multiplying the number C of the code blocks by the size L of the CRC attached to each of the code blocks.
6. The method according to claim 5 ,
wherein the size K of each of the code blocks satisfies a condition that a value obtained by multiplying the number C of the code blocks by the size K of the code block is larger than or equal to the size B′ of the modified input bit sequence.
7. The method according to claim 1 ,
wherein the size K of each of the code blocks satisfies a condition that a value obtained by multiplying the number C of the code blocks by the size K of the code block is larger than or equal to the size B′ of the modified input bit sequence.
8. The method according to claim 1 , further comprising:
allocating data to areas in a first code block of the code blocks except for a size of filler bits and the size L of the CRC; and
allocating the data to areas in the code blocks starting with a second code block except for the size L of the CRC.
9. The method according to claim 8 , wherein:
allocating data to the areas in the first code block comprises attaching the CRC to the first code block, and
allocating data to the areas in the code blocks starting with the second code block comprises attaching the CRC to the code blocks starting with the second code block.
10. The method according to claim 1 , wherein the maximum size Z of the code blocks is 6144 bits.
11. An apparatus for transmitting data in a wireless access system, the apparatus comprising:
a transmission unit configured to transmit the data;
a code block segmentation and cyclic redundancy check (CRC) attachment unit configured to support the transmission of the data; and
a channel coding unit,
wherein the code block segmentation and CRC attachment unit is further configured to:
calculate a number C of code blocks using a size B of an input bit sequence, a maximum size Z of the code blocks, and a size L of a cyclic redundancy check (CRC) which is to be attached to each of the code blocks;
calculate a size B′ of a modified input bit sequence using the number C of the code blocks, the size L of the CRC, and the size B of the input bit sequence;
obtain a size K of each of the code blocks using the size B′ of the modified input bit sequence and the number C of the code blocks;
segment the input bit sequence to have the number C of the code blocks and the obtained size K of each of the code blocks; and
generate the code blocks by attaching the CRC to each of the segmented input bit sequences,
wherein the channel coding unit is configured to perform channel-coding of the code blocks, and
wherein the number C of the code blocks is calculated as an integer by rounding up a value obtained by dividing the size B of the input bit sequence by a result of subtracting the size L of the CRC from the maximum size Z of the code blocks such that C=┌B/(Z−L)┐.
12. The apparatus according to claim 11 , wherein the size L of the CRC is 24 bits.
13. The apparatus according to claim 11 ,
wherein the CRC is attached to each of the code blocks to detect whether each of the code blocks contains errors.
14. The apparatus according to claim 11 ,
wherein the number C of the code blocks is set to 1 if the size B of the input bit sequence is less than the maximum size Z of the code blocks.
15. The apparatus according to claim 11 ,
wherein the size B′ of the modified input bit sequence is set to a value obtained by adding the size B of the input bit sequence to a result of multiplying the number C of the code blocks by the size L of the CRC attached to each of the code blocks.
16. The apparatus according to claim 15 ,
wherein the size K of each of the code blocks satisfies a condition that a value obtained by multiplying the number C of the code blocks by the size K of the code block is larger than or equal to the size B′ of the modified input bit sequence.
17. The apparatus according to claim 11 ,
wherein the size K of each of the code blocks satisfies a condition that a value obtained by multiplying the number C of the code blocks by the size K of the code block is larger than or equal to the size B′ of the modified input bit sequence.
18. The apparatus according to claim 11 , wherein the code block segmentation and CRC attachment unit is further configured to:
allocate data to areas in a first code block of the code blocks except for a size of filler bits and the size L of the CRC; and
allocate the data to areas in the code blocks starting with a second code block except for the size L of the CRC.
19. The apparatus according to claim 18 , wherein the code block segmentation and CRC attachment unit is further configured to:
attach the CRC to the first code block; and
attach the CRC to the code blocks starting with the second code block.
20. The apparatus according to claim 11 , wherein the maximum size Z of the code blocks is 6144 bits.