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 resource allocation for a communication on a wireless cellular network;

receive an indication that a modulation order to be used for the communication is 1024 quadrature amplitude modulation (QAM);

determine, based on the modulation order and the resource allocation, 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 three MIMO layers according to:

First TBS

Second TBS

105528

314888

107832

324336

110136

324336

115040

339112

117256

351224

119816

363336

125808

375448

and

decode a physical downlink shared channel (PDSCH) based on the second TBS.

2. The one or more media of claim 1 , wherein the resource allocation includes greater than 37 physical resource blocks (PRBs).

3. The one or more media of claim 1 , wherein the indication includes a modulation and coding scheme (MCS) index.

4. The one or more media of claim 3 , wherein, to determine the first TBS, 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.

5. The one or more media of claim 3 , 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 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 three MIMO layers according to:

First TBS

Second TBS

105528

314888

107832

324336

110136

324336

115040

339112

117256

351224

119816

363336

125808

375448

and

encode, for transmission to a user equipment (UE), 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 base station to transmit, to the 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 based on a determination that the resource allocation for the PDSCH is greater than 37 physical resource blocks (PRBs).

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 three.

12. The one or more media of claim 11 , wherein the coding rate threshold is 0.931.

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

receive a resource allocation for a communication, on a wireless cellular network;

receive an indication that a modulation order to be used for the communication is 1024 quadrature amplitude modulation (QAM);

determine, based on the modulation order and the resource allocation, 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

decode a physical downlink shared channel (PDSCH) based on the second TBS.

14. The one or more media of claim 13 , wherein the resource allocation includes greater than 28 physical resource blocks (PRBs).

15. The one or more media of claim 13 , wherein the indication includes a modulation and coding scheme (MCS) index, and wherein, to determine the first TBS, 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.

16. The one or more media of claim 13 , 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.

17. An apparatus to be implemented in a base station, the apparatus comprising:

a memory to store a transport block size (TBS) table;

logic, at least a portion of which is hardware, coupled to the memory, the logic 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 and the TBS table, a second TBS for a transport block of the PDSCH using two MIMO layers, wherein the TBS table includes:

First TBS

Second TBS

107832

214176

110136

220296

112608

226416

115040

230104

117256

236160

119816

236160

125808

251640

; and

encode, for transmission to a user equipment (UE), the PDSCH using the second TBS.

18. The apparatus of claim 17 , wherein the logic is to determine the second TBS based on the first TBS and the TBS table based on a determination that the resource allocation is greater than 55 physical resource blocks (PRBs).

19. The apparatus of claim 17 , wherein the logic is further to transmit or cause transmission of a modulation and coding scheme (MCS) index to the UE to indicate the modulation order.

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

21. 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 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 two.