Transport block selection for 1024 quadrature amplitude modulation (QAM)

1. One or more non-transitory, computer-readable media having instructions stored thereon that, when executed, cause a user equipment (UE) to:

receive a modulation and coding scheme (MCS) index;

determine, based on the MCS index, that a modulation order to be used for a communication on a wireless cellular network is 1024 quadrature amplitude modulation (QAM);

determine, based on the MCS index and a resource allocation for the communication, a first transport block size (TBS) for one multiple input, multiple output (MIMO) layer;

determine, based on the first TBS, a second TBS for a transport block of the communication using four MIMO layers according to:

First TBS

Second TBS

105528

422232

107832

422232

112608

452832

117256

471192

124464

 501792;

 and

perform the communication on the wireless cellular network based on the second TBS.

2. The one or more media of claim 1 , wherein, to determine the first TBS based on the MCS index, the UE is to determine a TBS index based on the MCS index and determine the first TBS based on the TBS index and the resource allocation.

3. The one or more media of claim 1 , wherein the determine the second TBS based on the first TBS is performed if the resource allocation for the communication is 28 physical resource blocks (PRBs) or greater.

4. The one or more media of claim 1 , wherein performing the communication includes receiving a physical downlink shared channel (PDSCH) communication.

5. The one or more media of claim 1 , wherein the MCS index is included in a downlink control information (DCI) that further includes scheduling information for the communication.

6. The one or more media of claim 1 , wherein the second TBS has a spectral efficiency closest to a target spectral efficiency among candidate TBSs that provide a coding rate below a coding rate threshold and is divided into code blocks of the same size, wherein the target spectral efficiency corresponds to a spectral efficiency of the first TBS scaled by four.

7. The one or more media of claim 6 , wherein the coding rate threshold is 0.931.

8. One or more non-transitory, computer-readable media having instructions stored thereon that, when executed, cause a base station (gNB) to:

determine that a modulation order to be used to transmit a physical downlink shared channel (PDSCH) on a wireless cellular network is 1024 quadrature amplitude modulation (QAM);

determine, based on the modulation order and a resource allocation for the PDSCH, a first transport block size (TBS) for one multiple input, multiple output (MIMO) layer;

determine, based on the first TBS, a second TBS for a transport block of the PDSCH using four MIMO layers according to:

First TBS

Second TBS

105528

422232

107832

422232

112608

452832

117256

471192

124464

 501792;

 and

transmit one or more MIMO layers of the PDSCH based on the second TBS.

9. The one or more media of claim 8 , wherein the instructions are further to cause the gNB to transmit, to a user equipment (UE), a modulation and coding scheme (MCS) index to indicate to the UE the modulation order and the first TBS.

10. The one or more media of claim 8 , wherein the determine the second TBS based on the first TBS is performed if the resource allocation for the PDSCH is 28 physical resource blocks (PRBs) or greater.

11. The one or more media of claim 8 , wherein the second TBS has a spectral efficiency closest to a target spectral efficiency among candidate TBSs that provide a coding rate below a threshold and is divided into code blocks of the same size, wherein the target spectral efficiency corresponds to a spectral efficiency of the first TBS scaled by four.

12. One or more non-transitory, computer-readable media having instructions stored thereon that, when executed, cause a user equipment (UE) to:

receive a downlink control information (DCI) that includes a modulation and coding scheme (MCS) index;

determine, based on the MCS index, that a modulation order to be used for a physical downlink shared channel (PDSCH) on a wireless cellular network is 1024 quadrature amplitude modulation (QAM);

determine, based on the MCS index and a resource allocation for the PDSCH, a first transport block size (TBS) for one multiple input, multiple output (MIMO) layer;

determine, based on the first TBS, a second TBS for a transport block of the PDSCH using two MIMO layers according to:

First TBS

Second TBS

107832

214176

110136

220296

112608

226416

115040

230104

117256

236160

119816

236160

125808

 251640;

 and

receive the PDSCH based on the second TBS.

13. The one or more media of claim 12 , wherein, to determine the first TBS based on the MCS index, the UE is to determine a TBS index based on the MCS index and determine the first TBS based on the TBS index and the resource allocation.

14. The one or more media of claim 12 , wherein the determine the second TBS based on the first TBS is performed if the resource allocation is 56 physical resource blocks (PRBs) or greater.

15. The one or more media of claim 12 , wherein the MCS index is included in a downlink control information (DCI) that further includes scheduling information for the PDSCH.

16. The one or more media of claim 12 , wherein the second TBS has a spectral efficiency closest to a target spectral efficiency among candidate TBSs that provide a coding rate below a threshold, wherein the target spectral efficiency corresponds to a spectral efficiency of the first TBS scaled by two.

17. An apparatus to be employed by a user equipment (UE), the apparatus comprising:

means for receiving a downlink control information (DCI) that includes a modulation and coding scheme (MCS) index;

means for determining, based on the MCS index, that a modulation order to be used for a communication on a wireless cellular network is 1024 quadrature amplitude modulation (QAM);

means for determining a transport block size (TBS) index based on the MCS index;

means for determining, based on the TBS index and a resource allocation for the communication, a first transport block size (TBS) for one multiple input, multiple output (MIMO) layer;

means for determining, based on the first TBS, a second TBS for a transport block of the communication using three MIMO layers according to:

First TBS

Second TBS

105528

314888

107832

324336

110136

324336

115040

339112

117256

351224

119816

363336

125808

 375448;

 and

means for performing or causing to perform the communication based on the second TBS.

18. The apparatus of claim 17 , wherein the means to determine the second TBS based on the first TBS is to determine the second TBS based on the first TBS according to the table of claim 16 if the resource allocation is 37 physical resource blocks (PRBs) or greater.

19. The apparatus of claim 17 , wherein the MCS index is included in a downlink control information (DCI) that further includes scheduling information for the PDSCH.

20. The apparatus of claim 17 , wherein the second TBS has a spectral efficiency closest to a target spectral efficiency among candidate TBSs that provide a coding rate below a threshold, wherein the target spectral efficiency corresponds to a spectral efficiency of the first TBS scaled by three.

21. The apparatus of claim 17 , wherein the communication includes a physical downlink shared channel (PDSCH).