Method and apparatus for determining a transport block size (TBS)
The present disclosure relates to transport block size (TBS) determining methods and apparatus. One example TBS determining method includes determining a second intermediate variable based on a determined TBS index, a frequency domain resource occupied by a first broadcast channel, and a second table, and determining a TBS based on the second intermediate variable and a scale factor, where the scale factor is greater than 1.
1. A transport block size (TBS) determining method, comprising:
receiving, by a communication device, a maximum modulation order;
determining, by the communication device, a modulation and coding scheme (MCS) index;
determining, by the communication device, a third correspondence, wherein the third correspondence comprises a correspondence between the MCS index, a modulation order, and a first TBS index;
determining, by the communication device, the modulation order and the first TBS index based on the MCS index and the third correspondence;
wherein a maximum modulation order in the third correspondence is equal to 6, a maximum TBS index corresponding to a modulation order 2 is equal to 10, and a maximum TBS index corresponding to a modulation order 4 is greater than or equal to 19; or
wherein the maximum modulation order in the third correspondence is equal to 8, a maximum TBS index corresponding to a modulation order 2 is equal to 10, a maximum TBS index corresponding to a modulation order 4 is equal to 19, and a maximum TBS index corresponding to a modulation order 6 is equal to 25;
determining, by the communication device, an intermediate variable based on the first TBS index, a frequency domain resource occupied by a first broadcast channel, and a second table, wherein the second table comprises a correspondence between the frequency domain resource, the first TBS index, and the intermediate variable; and
determining, by the communication device, a TBS corresponding to the first broadcast channel based on the intermediate variable and a first scale factor, wherein the first scale factor is greater than 1.
2. The method according to claim 1 , wherein a time domain resource occupied by a cyclic prefix (CP) corresponding to the first broadcast channel is not less than 300 microseconds.
3. The method according to claim 1 , wherein a time domain resource occupied by an Orthogonal Frequency Division Multiplexing (OFDM) symbol corresponding to the first broadcast channel is not less than 2.4 milliseconds.
4. The method according to claim 1 , wherein a subcarrier spacing (SCS) corresponding to the first broadcast channel is not greater than 417 hertz.
5. The method according to claim 1 , wherein the first scale factor is 3.
6. A transport block size (TBS) determining apparatus, comprising:
at least one processor; and
a memory coupled to the at least one processor and storing programming instructions for execution by the at least one processor to perform operations comprising:
receiving a maximum modulation order;
determining a modulation and coding scheme (MCS) index;
determining a third correspondence, wherein the third correspondence comprises a correspondence between the MCS index, a modulation order, and a first TBS index;
determining the modulation order and the first TBS index based on the MCS index and the third correspondence;
wherein a maximum modulation order in the third correspondence is equal to 6, a maximum TBS index corresponding to a modulation order 2 is equal to 10, and a maximum TBS index corresponding to a modulation order 4 is greater than or equal to 19; or
wherein the maximum modulation order in the third correspondence is equal to 8, a maximum TBS index corresponding to a modulation order 2 is equal to 10, a maximum TBS index corresponding to a modulation order 4 is equal to 19, and a maximum TBS index corresponding to a modulation order 6 is equal to 25;
determining an intermediate variable based on the first TBS index, a frequency domain resource occupied by a first broadcast channel, and a second table, wherein the second table comprises a correspondence between the frequency domain resource, the first TBS index, and the intermediate variable; and
determining a TBS corresponding to the first broadcast channel based on the intermediate variable and a first scale factor, wherein the first scale factor is greater than 1.
7. The apparatus according to claim 6 , wherein a time domain resource occupied by a cyclic prefix (CP) corresponding to the first broadcast channel is not less than 300 microseconds.
8. The apparatus according to claim 6 , wherein a time domain resource occupied by an Orthogonal Frequency Division Multiplexing (OFDM) symbol corresponding to the first broadcast channel is not less than 2.4 milliseconds.
9. The apparatus according to claim 6 , wherein a subcarrier spacing (SCS) corresponding to the first broadcast channel is not greater than 417 hertz.
10. The apparatus according to claim 6 , wherein the first scale factor is 3.
11. A non-transitory computer-readable storage medium comprising instructions which, when executed by one or more processors, cause the one or more processors to perform operations comprising:
receiving a maximum modulation order;
determining a modulation and coding scheme (MCS) index;
determining a third correspondence, wherein the third correspondence comprises a correspondence between the MCS index, a modulation order, and a first TBS index;
determining the modulation order and the first TBS index based on the MCS index and the third correspondence;
wherein a maximum modulation order in the third correspondence is equal to 6, a maximum TBS index corresponding to a modulation order 2 is equal to 10, and a maximum TBS index corresponding to a modulation order 4 is greater than or equal to 19; or
wherein the maximum modulation order in the third correspondence is equal to 8, a maximum TBS index corresponding to a modulation order 2 is equal to 10, a maximum TBS index corresponding to a modulation order 4 is equal to 19, and a maximum TBS index corresponding to a modulation order 6 is equal to 25;
determining an intermediate variable based on the first TBS index, a frequency domain resource occupied by a first broadcast channel, and a second table, wherein the second table comprises a correspondence between the frequency domain resource, the first TBS index, and the intermediate variable; and
determining a TBS corresponding to the first broadcast channel based on the intermediate variable and a first scale factor, wherein the first scale factor is greater than 1.
12. The non-transitory computer-readable storage medium according to claim 11 , wherein a time domain resource occupied by a cyclic prefix (CP) corresponding to the first broadcast channel is not less than 300 microseconds, a time domain resource occupied by an Orthogonal Frequency Division Multiplexing (OFDM) symbol corresponding to the first broadcast channel is not less than 2.4 milliseconds, or a subcarrier spacing (SCS) corresponding to the first broadcast channel is not greater than 417 hertz.
13. The non-transitory computer-readable storage medium according to claim 11 , wherein the first scale factor is 3.