Method and apparatus for configuring parameters of a port selection codebook

1. A user equipment (UE) comprising:

a transceiver configured to receive information on P channel state information-reference signal (CSI-RS) ports and information on a parameter γ, wherein the parameter γ is a value among a set of values; and

a processor operably coupled to the transceiver, the processor, based on the information, configured to:

determine a value of Y v based on the parameter γ;

select Y v CSI-RS ports from the P CSI-RS ports; and

determine a CSI report including an indicator indicating the selected Y v CSI-RS ports,

wherein the transceiver is configured to transmit the CSI report including the indicator indicating the selected Y v CSI-RS ports.

2. The UE of claim 1 , wherein the processor is configured to determine the value of Y v as Y v =γ×P.

3. The UE of claim 1 , wherein a value of γis from a set of values including {½, ¾, 1}.

4. The UE of claim 1 , wherein a value of P is from a set of values including {4, 8, 12, 16, 24, 32}.

5. The UE of claim 1 , wherein the information about the parameter γ is indicated via a joint parameter indicating the parameter γ and at least one additional parameter.

6. The UE of claim 5 , wherein:

the joint parameter indicates the parameter γ, and two additional parameters M v and β,

the parameter M v indicates a number of frequency domain basis vectors, and

the parameter β indicates a maximum number of non-zero coefficients as ┌βK 1 M v ┐, where ┌ ┐ is a ceiling function.

7. The UE of claim 5 , wherein the joint parameter is paramCombination-r17 and indicates a parameter combination (γ, M v , β) such that γ∈{½, ¾, 1}, M v ∈{1,2}, and β∈{½, ¾, 1}.

8. The UE of claim 7 , wherein the parameter combination (γ, M v , β) is at least one of the following combinations:

y

M v

β

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1

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2

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9. A base station (BS) comprising:

a processor configured to determine information on P channel state information-reference signal (CSI-RS) ports and information on a parameter γ, wherein the parameter γ is a value among a set of values; and

a transceiver operably coupled to the processor, the transceiver configured to:

transmit the information on the P CSI-RS ports and the parameter γ; and

receive a CSI report including an indicator indicating Y v CSI-RS ports,

wherein:

the Y v CSI-RS ports are among the P CSI-RS ports, and

the value of Y v is based on the parameter γ.

10. The BS of claim 9 , wherein the value of Y v is determined as Y v =γ×P.

11. The BS of claim 9 , wherein a value of γ is from a set of values including {½, ¾, 1}.

12. The BS of claim 9 , wherein a value of P is from a set of values including {4, 8, 12, 16, 24, 32}.

13. The BS of claim 9 , wherein the information about the parameter γ is indicated via a joint parameter indicating the parameter γ and at least one additional parameter.

14. The BS of claim 13 , wherein:

the joint parameter indicates the parameter γ, and two additional parameters M v and β,

the parameter M v indicates a number of frequency domain basis vectors, and

the parameter β indicates a maximum number of non-zero coefficients as ┌βK 1 M v ┐, where ┌ ┐ is a ceiling function.

15. The BS of claim 13 , wherein the joint parameter is paramCombination-r17 and indicates a parameter combination (γ, M v , β) such that γ ∈{½, ¾, 1}, M v ∈{1,2}, and β∈{½, ¾, 1}.

16. The BS of claim 15 , wherein the parameter combination (γ, M v , β) is at least one of the following combinations:

y

M v

β

¾

1

¾

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1

1

1

1

¾

1

1

1

¾

2

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2

1

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2

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 1.

17. A method for operating a user equipment (UE), the method comprising:

receiving information on P channel state information-reference signal (CSI-RS) ports and information including information about a parameter γ, wherein the parameter γ is a value among a set of values;

determining a value of Y v based on the parameter γ;

selecting Y v CSI-RS ports from the P CSI-RS ports;

determining a CSI report including an indicator indicating the selected Y v CSI-RS ports; and

transmitting the CSI report including the indicator indicating the selected Y v CSI-RS ports.

18. The method of claim 17 , further comprising determining the value of Y v as Y v =γ×P.

19. The method of claim 17 , wherein a value of γ is from a set of values including {½, ¾, 1}.

20. The method of claim 17 , wherein a value of P is from a set of values including {4, 8, 12, 16, 24, 32}.