Transport block selection for 1024 quadrature amplitude modulation (QAM)

1. A user equipment (UE), the UE comprising processor circuitry coupled with memory circuitry, the memory circuitry having instructions, which when executed by the processor circuitry, cause the processor circuitry 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 UE of claim 1 , wherein to determine the first TBS based on the MCS index, the processor circuitry 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 UE of claim 1 , wherein the determine the second TBS based on the first TBS is further based on the resource allocation for the communication being 28 physical resource blocks (PRBs) or greater.

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

5. The UE 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 UE 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 UE of claim 6 , wherein the coding rate threshold is 0.931.

8. An apparatus to be employed by a base station (gNB), the apparatus comprising processor circuitry coupled with memory circuitry, the memory circuitry having instructions, which when executed by the processor circuitry, cause the processor circuitry 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 apparatus 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 apparatus of claim 8 , wherein the determine the second TBS based on the first TBS is further based one the resource allocation for the PDSCH being 28 physical resource blocks (PRBs) or greater.

11. The apparatus of claim 8 , wherein the second TBS has a spectral efficiency closest to a target spectral efficiency among candidate TB Ss 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. A user equipment (UE), the UE comprising processor circuitry coupled with memory circuitry, the memory circuitry having instructions, which when executed by the processor circuitry, cause the processor circuitry 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 UE of claim 12 , wherein to determine the first TBS based on the MCS index, the processor circuitry 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 UE of claim 12 , wherein the determine the second TBS based on the first TBS is further based on the resource allocation being 56 physical resource blocks (PRBs) or greater.

15. The UE of claim 12 , wherein the MCS index is included in the DCI that further includes scheduling information for the PDSCH.

16. The UE 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 base station, the apparatus comprising processor circuitry coupled with memory circuitry, the memory circuitry having instructions, which when executed by the processor circuitry, cause the processor circuitry 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

perform or cause to perform the communication based on the second TBS.

18. The apparatus of claim 17 , wherein to determine the second TBS based on the first TBS, the processor circuitry is to determine the second TBS based on the first TBS according to the table of claim 17 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 the PDSCH.