Codebook subset restriction for artificial intelligence/machine learning enabled channel state information reporting

1 . One or more non-transitory, computer-readable media having instructions that, when executed, cause processing circuitry to:

identify a channel state information (CSI) feedback configuration for artificial intelligence (AI)/machine learning (ML) based CSI feedback received from a base station, the CSI feedback configuration including an indication of at least one forbidden beam;

perform measurements of at least one received spatial beam in accordance with the CSI feedback configuration; and

generate a CSI feedback report for transmission to the base station, the CSI feedback report being generated in accordance with the CSI feedback configuration, and CSI feedback values for the at least one forbidden beam being set based at least in part on a power of a precoding matrix of at least one non-forbidden spatial beam of the CSI feedback report.

2 . The one or more non-transitory, computer-readable media of claim 1 , wherein:

the CSI feedback configuration includes an indication of a number of transceivers in a horizontal direction in an antenna array corresponding to the base station, a number of transceivers in a vertical direction in the antenna array, a first oversampling factor for the horizontal direction, and a second oversampling factor for the vertical direction; and

to perform the measurements comprises to perform the measurements based at least in part on the number of transceivers in the horizontal direction, the number of transceivers in the vertical direction, the first oversampling factor, and the second oversampling factor.

3 . The one or more non-transitory, computer-readable media of claim 1 , wherein:

the CSI feedback configuration includes an indication of spatial beams selectable for the CSI feedback report for a first polarization; and

to perform the measurements comprises to utilize a subset of the spatial beams selectable for the first polarization and a second polarization.

4 . The one or more non-transitory, computer-readable media of claim 1 , wherein:

the CSI feedback configuration includes an indication of first spatial beams selectable for the CSI feedback report for a first polarization and an indication of second spatial beams selected for the CSI feedback report for a second polarization; and

to perform the measurements comprises to utilize a subset of the first spatial beams selectable for the first polarization and to utilize the second spatial beams for the second polarization.

5 . The one or more non-transitory, computer-readable media of claim 1 , wherein:

the CSI feedback configuration includes an indication of a size of precoding matrix for the CSI feedback report; and

to generate the CSI feedback report comprises to generate a precoding matrix of the indicated size of precoding matrix.

6 . The one or more non-transitory, computer-readable media of claim 1 , wherein:

to generate the CSI feedback report comprises to utilize one or more spatial beams that do not include the at least one forbidden beam for the CSI feedback report.

7 . The one or more non-transitory, computer-readable media of claim 1 , wherein to generate the CSI feedback report comprises to reflect a subset codebook restriction in a channel quality indicator (CQI) of the CSI feedback report.

8 . The one or more non-transitory, computer-readable media of claim 1 , wherein to generate the CSI feedback report comprises to have a ratio of a summation of a power of precoding matrix over a forbidden spatial beam to a maximum of summation of the power of precoding matrix over a non-forbidden spatial beam that meets a defined power profile requirement.

9 . The one or more non-transitory, computer-readable media of claim 1 , wherein to generate the CSI feedback report comprises to have a ratio of a summation of a power of precoding matrix over a forbidden spatial beam to an average of summation of the power of precoding matrix over a non-forbidden spatial beam that meets a defined power profile requirement.

10 . An apparatus comprising:

processing circuitry to:

measure at least one received beam to produce channel state information (CSI);

determine a CSI feedback configuration for artificial intelligence (AI)/machine learning (ML) based CSI feedback; and

generate, for transmission to a base station, a CSI feedback report to indicate the CSI for the at least one received beam, the CSI feedback report generated in accordance with the CSI feedback configuration, wherein to generate the CSI feedback report comprises to:

utilize a precoder implementing a matrix of

MP

=

1

2

⁢

N

1

⁢

N

2

⁢

W

~

1

⁢

W

~

1

H

⁢

P

,

where

⁢

W

~

1

=

[

BS

0

N

1

⁢

N

2

×

(

N

1

⁢

N

2

-

F

)

0

N

1

⁢

N

2

×

(

N

1

⁢

N

2

-

F

)

BS

]

,

 where N 1 comprises a number of rows of transceivers in an antenna array, where N 2 comprises a number of columns of the transceivers in an antenna array, where B comprises spatial beam indexes, where F comprises a number of forbidden beams at a polarization, where P comprises a precoder matrix of 2N 1 N 2 ×N 3 , where N 3 comprise a number of subbands, and where S comprises an indication of element vectors for the CSI feedback report; or

utilize a precoder implementing a matrix of

MRM

H

=

1

2

⁢

N

1

⁢

N

2

⁢

W

~

1

⁢

W

~

1

H

⁢

R

⁡

(

W

~

1

⁢

W

~

1

H

)

H

,

where

⁢

W

~

1

=

[

BS

0

N

1

⁢

N

2

×

(

N

1

⁢

N

2

-

F

)

0

N

1

⁢

N

2

×

(

N

1

⁢

N

2

-

F

)

BS

]

,

 where N 1 comprises a number of rows of transceivers in an antenna array, where N 2 comprises a number of columns of the transceivers in an antenna array, where B comprises spatial beam indexes, where F comprises a number of forbidden beams at a polarization, where R comprises a subband covariance matrix or a wideband matrix, and where S comprises an indication of element vectors for the CSI feedback report; and

interface circuitry coupled with the processing circuitry, the interface circuitry to transmit the CSI feedback report.

11 . The apparatus of claim 10 , wherein the processing circuitry is further to:

identify configuration information for the CSI feedback configuration received from the base station; and

configure the apparatus based at least in part on the configuration information.

12 . The apparatus of claim 11 , wherein the configuration information includes an indication of a number of transceivers in a horizontal direction in an antenna array corresponding to the base station, a number of transceivers in a vertical direction in the antenna array, a first oversampling factor for the horizontal direction, and a second oversampling factor for the vertical direction.

13 . The apparatus of claim 11 , wherein:

the configuration information includes an indication of spatial beams selected for the CSI feedback report for a first polarization; and

to configure the apparatus based at least in part on the configuration information comprises to configure the apparatus to utilize the spatial beams for the first polarization and a second polarization.

14 . A method comprising:

generating a channel state information (CSI) feedback configuration message for transmission to a user equipment (UE), the CSI feedback configuration message providing a CSI feedback configuration for artificial intelligence (AI)/machine learning (ML) based CSI feedback, wherein the CSI feedback configuration indicates to have a ratio of a summation of a power of precoding matrix over a forbidden spatial beam to a maximum or an average of a summation of the power of precoding matrix over a non-forbidden spatial beam that meets a defined power profile requirement; and

identifying a CSI feedback report received from the UE, the CSI feedback report in accordance with the CSI feedback configuration.

15 . The method of claim 14 , wherein the CSI feedback configuration message includes an indication of a number of transceivers in a horizontal direction in an antenna array corresponding to a base station, a number of transceivers in a vertical direction in the antenna array, a first oversampling factor for the horizontal direction, and a second oversampling factor for the vertical direction.

16 . The method of claim 14 , wherein the CSI feedback configuration includes an indication of first spatial beams selected for the CSI feedback report for a first polarization and an indication of second spatial beams selected for the CSI feedback report for a second polarization, the UE to be configured to utilize the first spatial beams for the CSI feedback report for the first polarization and to utilize the second spatial beams for the CSI feedback report for the second polarization.