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, and wherein the formula accounts for cyclic redundancy check, 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 formula is based on an approximate transport block size, TBS0, a number of code blocks, C, at least one of a number of CRC bits attached to the transport block, L2, and a number of CRC bits added to each of the C code blocks, L3.
3. The wireless transmitter of claim 2 , wherein the formula is based on a comparison of TBS0 plus a number of CRC bits attached to the transport block with a threshold size, Z.
4. The wireless transmitter of claim 3 , wherein when TBS0 plus a number of CRC bits attached to the transport block is greater than the threshold size, Z, the formula includes dividing TBS0+L2 by C|, rounding up to the nearest integer, and multiplying the result by C.
5. The wireless transmitter of claim 3 , wherein when TBS0 plus a number of CRC bits attached to the transport block is greater than the threshold size, Z, the formula includes dividing TBS0+L2 by C*A|, rounding up to the nearest integer, and multiplying the result by C*A, where A is a constant.
6. The wireless transmitter of claim 3 , wherein when TBS0 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, wherein A is one of 1 and 8.
7. The wireless transmitter of claim 3 , wherein the formula includes determining C based on dividing TBS0 plus L2 by Z minus L3, and rounding up to the nearest integer.
8. 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, and wherein the formula accounts for cyclic redundancy check, CRC, bits attached to the transport block; and
transmitting the transport block according to the determined TBS.
9. The method of claim 8 , wherein the formula is based on an approximate transport block size, TBS0, a number of code blocks, C, at least one of a number of CRC bits attached to the transport block, L2, and a number of CRC bits added to each of the C code blocks, L3.
10. The method of claim 9 , wherein the formula is based on a comparison of TBS0 plus a number of CRC bits attached to the transport block with a threshold size, Z.
11. The method of claim 10 , wherein when TBS0 plus a number of CRC bits attached to the transport block is greater than the threshold size, Z, the formula includes dividing TBS0+L2 by C, rounding up to the nearest integer, and multiplying the result by C.
12. The method of claim 9 , wherein when TBS0 plus a number of CRC bits attached to the transport block is greater than the threshold size, Z, the formula includes dividing TBS0+L2 by C*A|, rounding up to the nearest integer, and multiplying the result by C*A, where A is a constant.
13. The method of claim 10 , wherein when TBS0 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, wherein A is one of 1 and 8.
14. The method of claim 10 , wherein the formula includes determining C based on dividing TBS0 plus L2 by Z minus L3, and rounding up to the nearest integer.
15. 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, and wherein the formula accounts for cyclic redundancy check, CRC, bits attached to the transport block; and
decode the wireless signal to obtain the transport block.
16. The wireless receiver of claim 15 , wherein the formula is based on an approximate transport block size, TBS0, a number of code blocks, C, at least one of a number of CRC bits attached to the transport block, L2, and a number of CRC bits added to each of the C code blocks, L3.
17. The wireless receiver of claim 16 , wherein the formula is based on a comparison of TBS0 plus a number of CRC bits attached to the transport block with a threshold size, Z.
18. The wireless receiver of claim 17 , wherein when TBS0 plus a number of CRC bits attached to the transport block is greater than the threshold size, Z, the formula includes dividing TBS0+L2 by C, rounding up to the nearest integer, and multiplying the result by C.
19. The wireless receiver of claim 17 , wherein when TBS0 plus a number of CRC bits attached to the transport block is greater than the threshold size, Z, the formula includes dividing TBS0+L2 by C*A|, rounding up to the nearest integer, and multiplying the result by C*A, where A is a constant.
20. The wireless receiver of claim 17 , wherein the formula includes determining C based on dividing TBS0 plus L2 by Z minus L3, and rounding up to the nearest integer.
21. The wireless receiver of claim 17 , wherein when TBS0 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, wherein A is one of 1 and 8.
22. 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, and wherein the formula accounts for cyclic redundancy check, CRC, bits attached to the transport block; and
decoding the wireless signal to obtain the transport block.
23. The method of claim 22 , wherein the formula is based on an approximate transport block size, TBS0, a number of code blocks, C, at least one of a number of CRC bits attached to the transport block, L2, and a number of CRC bits added to each of the C code blocks, L3.
24. The method of claim 23 , wherein the formula is based on a comparison of TBS0 plus a number of CRC bits attached to the transport block with a threshold size, Z.
25. The method of claim 24 , wherein when TBS0 plus a number of CRC bits attached to the transport block is greater than the threshold size, Z, the formula includes dividing TBS0+L2 by C, rounding up to the nearest integer, and multiplying the result by C.
26. The method of claim 24 , wherein when TBS0 plus a number of CRC bits attached to the transport block is greater than the threshold size, Z, the formula includes dividing TBS0+L2 by C*A|, rounding up to the nearest integer, and multiplying the result by C*A, where A is a constant.
27. The method of claim 24 , wherein the formula includes determining C based on dividing TBS0 plus L2 by Z minus L3, and rounding up to the nearest integer.
28. The method of claim 24 , wherein when TBS0 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, wherein A is one of 1 and 8.