Methods, apparatus and systems for determining a transport block size in a wireless communication
Methods, apparatus and systems for determining a transport block size in a wireless communication are disclosed. In one embodiment, a method performed by a wireless communication device is disclosed, the method including: receiving control information from a wireless communication node, wherein the control information includes a plurality of transmission parameters related to transport blocks to be transmitted between the wireless communication device and the wireless communication node; calculating an intermediate transport block size (TBS) for the transport blocks based on the plurality of transmission parameters; modifying the intermediate TBS to generate a modified TBS in response to an event that the intermediate TBS is smaller than a threshold; and determining a final TBS for the transport blocks based on a TBS that is closest to the modified TBS, among TBSs that are in a quantized set and not smaller than the modified TBS.
1. A method performed by a wireless communication device, the method comprising:
receiving control information from a wireless communication node, wherein the control information includes at least one transmission parameter related to at least one transport block to be transmitted between the wireless communication device and the wireless communication node;
calculating a transport block size (TBS) for the at least one transport block based on the at least one transmission parameter;
determining a final TBS for the at least one transport block by selecting a TBS that is closest to the calculated TBS among a plurality of quantized TBSs; and
using the final TBS for transmissions between the wireless communication device and the wireless communication node.
2. The method of claim 1 , wherein the plurality of quantized TBSs comprises a set of quantized TBSs denoted by {TBS i , i=1, 2, . . . N} wherein Nis a positive integer greater than 2, a quantization step size of the set of quantized TBSs increases with increasing TBS values, and the final TBS is not smaller than the calculated TBS.
3. The method of claim 2 , wherein each element of the set of quantized TBSs satisfy
TBS
i
mod
⌈
TBS
i
+
TB_CRC
3840
-
24
⌉
=
0
;
where TB_CRC equals a number of transport block cyclic redundancy check (CRC) bits, and where ┌X┐ means rounding up X to a next nearest integer.
4. The method of claim 2 , wherein each element of the set of quantized TBSs satisfy TBS i mod 8=0, and each element of the set of quantized TBSs is less than or equal to 8424.
5. The method of claim 2 , wherein each element of the set of quantized TBSs satisfies the following conditions:
when TBS i is less than or equal to a threshold K threshold , (TBS LTE −TBS NR )/TBS NR <0.2; and
when TBS i is greater than the threshold K threshold , (TBS LTE −TBS NR )/TBS NR <0.05,
wherein K min <K threshold <K max }, K min is an integer between 10 and 100, K max is an integer greater than 10000, TBS LTE is a TBS set defined for a Long Term Evolution (LTE) system, TBS NR is a TBS set defined for a New Radio (NR) system.
6. The method of claim 5 , wherein K threshold =1000.
7. The method of claim 1 , wherein the at least one transmission parameter comprises:
a modulation order configured for transmission of the at least one transport block;
a code rate configured for transmission of the at least one transport block; and
a quantity of physical resource blocks configured for transmission of the at least one transport block.
8. The method of claim 7 , wherein calculating the TBS comprises:
calculating an intermediate TBS for the at least one transport block based on the at least one transmission parameter;
determining a correction factor based on: the quantity of physical resource blocks, the modulation order and the code rate; and
modifying the intermediate TBS based on the correction factor to generate the calculated TBS.
9. The method of claim 8 , wherein calculating the intermediate TBS comprises:
calculating a multiplication product of: the modulation order, the code rate, a total quantity of resource elements for transmission of the at least one transport block, and a quantity of layers configured for transmission of the at least one transport block; and
using the multiplication product as the intermediate TBS.
10. A wireless communication device comprising a processor and a memory, wherein the memory stores instructions that, when executed, causes the processor to perform the method of claim 1 .
11. A method performed by a wireless communication node, the method comprising:
generating a plurality of transmission parameters related to transport blocks;
transmitting control information that comprises the plurality of transmission parameters to a wireless communication device;
calculating a transport block size (TBS) for the transport blocks based on the plurality of transmission parameters;
determining a final TBS for the transport blocks by selecting a TBS that is closest to the calculated TBS among a set of quantized TBSs; and
communicating with a wireless communication device using the transport blocks based on the final TBS.
12. The method of claim 11 , wherein the set of quantized TBSs is denoted by {TBS i , i=1, 2, . . . N} wherein N is a positive integer greater than 2, a quantization step size of the set of quantized TBSs increases with increasing TBS values, and the final TBS is not smaller than the calculated TBS.
13. The method of claim 12 , wherein each element of the set of quantized TBSs satisfy
T
B
S
i
mod
⌈
TBS
i
+
TB
_
CRC
3
8
4
0
-
2
4
⌉
=
0
;
where TB_CRC equals a number of transport block cyclic redundancy check (CRC) bits, and where ┌X┐ means rounding up X to a next nearest integer.
14. The method of claim 12 , wherein each element of the set of quantized TBSs satisfy TBS i mod 8=0, and each element of the set of quantized TBSs is less than or equal to 8424.
15. The method of claim 12 , wherein each element of the set of quantized TBSs satisfies the following conditions:
when TBS i is less than or equal to a threshold K threshold , (TBS LTE −TBS NR )/TBS NR <0.2; and
when TBS i is greater than the threshold K threshold , (TBS LTE −TBS NR )/TBS NR <0.05,
wherein K min <K threshold <K max }, K min is an integer between 10 and 100, K max is an integer greater than 10000, TBS LTE is a TBS set defined for a Long Term Evolution (LTE) system, TBS NR is a TBS set defined for a New Radio (NR) system.
16. The method of claim 15 , wherein K threshold =1000.
17. The method of claim 11 , wherein the plurality of transmission parameters comprises:
a modulation order configured for transmission of the transport blocks;
a code rate configured for transmission of the transport blocks; and
a quantity of physical resource blocks configured for transmission of the transport blocks.
18. The method of claim 17 , wherein calculating the TBS comprises:
calculating an intermediate TBS for the transport blocks based on the plurality of transmission parameters;
determining a correction factor based on: the quantity of physical resource blocks, the modulation order and the code rate; and
modifying the intermediate TBS based on the correction factor to generate the calculated TBS.
19. The method of claim 18 , wherein calculating the intermediate TBS comprises:
calculating a multiplication product of: the modulation order, the code rate, a total quantity of resource elements for transmission of the transport blocks, and a quantity of layers configured for transmission of the transport blocks; and
using the multiplication product as the intermediate TBS.
20. A wireless communication node comprising a processor and a memory, wherein the memory stores instructions that, when executed, causes the processor to perform the method of claim 11 .