Transport block size determination for equal size code blocks
According to some embodiments, a method for use in a wireless receiver comprises determining a transport block size, TBS, for a transport block to be communicated between the wireless transmitter and a wireless receiver via a physical channel transmission. The TBS determination uses a formula accounting for cyclic redundancy check, CRC, bits. The method further comprises transmitting the transport block according to the determined TBS. In particular embodiments the formula is based on an approximate transport block size, a number of code blocks, at least one of a number of CRC bits attached to the transport block, and a number of CRC bits added to each of the C code blocks.
1. A wireless transmitter comprising processing circuitry operable to:
determine a transport block size, TBS, for a transport block to be communicated between the wireless transmitter and a wireless receiver via a physical channel transmission, the TBS determination using a formula accounting for cyclic redundancy check, CRC, bits wherein the formula is based on an approximate transport block size, TBS 0 , and a number of CRC bits attached to the transport block; and
transmit the transport block according to the determined TBS.
2. The wireless transmitter of claim 1 , wherein the CRC bits include at least one of transport block CRC bits and code segmentation CRC bits.
3. The wireless transmitter of claim 1 , wherein the formula is based on an approximate transport block size, TBS 0 , a number of code blocks, C, at least one of a number of CRC bits attached to the transport block, L 2 , and a number of CRC bits added to each of the C code blocks, L 3 .
4. The wireless transmitter of claim 3 , wherein the formula is based on a comparison of TBS 0 plus a number of CRC bits attached to the transport block with a threshold size, Z.
5. The wireless transmitter of claim 4 , wherein when TBS 0 plus a number of CRC bits attached to the transport block is greater than the threshold size, Z, the formula includes dividing TBS 0 +L 2 by C, rounding up to the nearest integer, and multiplying the result by C.
6. The wireless transmitter of claim 4 , wherein when TBS 0 plus a number of CRC bits attached to the transport block is greater than the threshold size, Z, the formula includes dividing TBS 0 +L 2 by C*A, rounding up to the nearest integer, and multiplying the result by C*A, where A is a constant.
7. The wireless transmitter of claim 4 , wherein the formula includes determining C based on dividing TBS 0 plus L 2 by Z minus L 3 , and rounding up to the nearest integer.
8. The wireless transmitter of claim 3 , wherein the formula includes determining the TBS by subtracting L 2 .
9. The wireless transmitter of claim 4 , wherein when TBS 0 plus a number of CRC bits attached to the transport block is less than the threshold size, Z, the formula includes calculating A*ceil(TBS0/A) for a constant A.
10. The wireless transmitter of claim 6 , wherein A is 8.
11. The wireless transmitter of claim 4 , wherein L 2 is 24, L 3 is 24; and Z is one of 3840 and 8448.
12. The wireless transmitter of claim 1 , wherein the formula includes determining TBS 0 based on available transmission resources by determining the approximate transport block size based on a number of symbols available for transmission and a lookup table.
13. A method for use in a wireless transmitter, the method comprising:
determining a transport block size, TBS, for a transport block to be communicated between the wireless transmitter and a wireless receiver via a physical channel transmission, the TBS determination using a formula accounting for cyclic redundancy check, CRC, bits wherein the formula is based on an approximate transport block size, TBS 0 , and a number of CRC bits attached to the transport block; and
transmitting the transport block according to the determined TBS.
14. The method of claim 13 , wherein the CRC bits include at least one of transport block CRC bits and code segmentation CRC bits.
15. The method of claim 13 , wherein the formula is based on an approximate transport block size, TBS 0 , a number of code blocks, C, at least one of a number of CRC bits attached to the transport block, L 2 , and a number of CRC bits added to each of the C code blocks, L 3 .
16. The method of claim 15 , wherein the formula is based on a comparison of TBS 0 plus a number of CRC bits attached to the transport block with a threshold size, Z.
17. The method of claim 16 , wherein when TBS 0 plus a number of CRC bits attached to the transport block is greater than the threshold size, Z, the formula includes dividing TBS 0 +L 2 by C, rounding up to the nearest integer, and multiplying the result by C.
18. The method of claim 16 , wherein when TBS 0 plus a number of CRC bits attached to the transport block is greater than the threshold size, Z, the formula includes dividing TBS 0 +L 2 by C*A, rounding up to the nearest integer, and multiplying the result by C*A, where A is a constant.
19. The method of claim 16 , wherein the formula includes determining C based on dividing TBS 0 plus L 2 by Z minus L 3 , and rounding up to the nearest integer.
20. The method of claim 15 , wherein the formula includes determining the TBS by subtracting L 2 .
21. The method of claim 16 , wherein when TBS 0 plus a number of CRC bits attached to the transport block is less than the threshold size, Z, the formula includes calculating A*ceil(TBS0/A) for a constant A.
22. The method of claim 18 , wherein A is 8.
23. The method of claim 16 , wherein L 2 is 24, L 3 is 24, and Z is one of 3840 and 8448.
24. The method of claim 13 , wherein the formula includes determining TBS 0 based on available transmission resources by determining the approximate transport block size based on a number of symbols available for transmission and a lookup table.
25. A wireless receiver comprising processing circuitry operable to:
receive a wireless signal via a physical channel transmission from a wireless transmitter, the wireless signal corresponding to a transport block;
determine a transport block size, TBS, using a formula accounting for cyclic redundancy check, CRC, bits wherein the formula is based on an approximate transport block size, TBS 0 , and a number of CRC bits attached to the transport block; and
decode the wireless signal to obtain the transport block.
26. The wireless receiver of claim 25 , wherein the CRC bits include at least one of transport block CRC bits and code segmentation CRC bits.
27. The wireless receiver of claim 25 , wherein the formula is based on an approximate transport block size, TBS 0 , a number of code blocks, C, at least one of a number of CRC bits attached to the transport block, L 2 , and a number of CRC bits added to each of the C code blocks, L 3 .
28. A method for use in a wireless receiver, the method comprising:
receiving a wireless signal via a physical channel transmission from a wireless transmitter, the wireless signal corresponding to a transport block;
determining a transport block size, TBS, using a formula accounting for cyclic redundancy check, CRC, bits wherein the formula is based on an approximate transport block size, TBS 0 , and a number of CRC bits attached to the transport block; and
decoding the wireless signal to obtain the transport block.
29. The method of claim 28 , wherein the CRC bits include at least one of transport block CRC bits and code segmentation CRC bits.
30. The method of claim 28 , wherein the formula is based on an approximate transport block size, TBS 0 , a number of code blocks, C, at least one of a number of CRC bits attached to the transport block, L 2 , and a number of CRC bits added to each of the C code blocks, L 3 .