Power control for new radio uplink single-user multiple-input-multiple- output communication

1. A User Equipment, UE, comprising:

processing circuitry configured to:

derive a power P to be used for uplink power control for a physical uplink shared channel transmission;

determine whether the UE is using codebook based transmission or non-codebook based transmission; and

determine a power to be used for a set of antenna ports based on the power P according to a rule that depends on whether the UE is utilizing codebook based transmission or non-codebook based transmission for the physical uplink shared channel transmission, the set of antenna ports being antenna ports on which the physical uplink shared channel transmission is transmitted with non-zero power,

wherein the rule is such that, for a case of non-codebook based precoding, in order to determine the power to be used for the set of antenna ports based on the power P according to the rule, the processing circuitry is further configured to equally divide the power P across the set of antenna ports on which the physical uplink shared channel transmission is transmitted with non-zero power, and

wherein the rule is such that, for a case of codebook based transmission, in order to determine the power to be used for the set of antenna ports based on the power P according to the rule, the processing circuitry is further configured to derive a second power P′ by scaling the power P with a ratio of a number of antenna ports on which the physical uplink shared channel transmission is transmitted with non-zero power to a number of Sounding Reference Signal, SRS, ports in an SRS resource at the UE, and equally divide the second power P′ across the set of antenna ports on which the physical uplink shared channel transmission is transmitted with non-zero power.

2. The UE of claim 1 wherein the UE further comprises an interface, and the processing circuitry is further configured to transmit, via the interface, the physical uplink shared channel transmission using the set of antenna ports.

3. The UE of claim 1 wherein the rule is such that, for a case of non-codebook based precoding and reciprocity based transmission, in order to determine the power to be used for the set of antenna ports based on the power P according to the rule, the processing circuitry is further configured to:

equally divide the power P across the set of antenna ports on which the physical uplink shared channel transmission is transmitted with non-zero power.

4. The UE of claim 3 wherein the rule is such that the second power P′ may equal the power P for rank 1 transmission for:

at least two UE capabilities from a group of UE capabilities consisting of: a capability to perform full coherence transmission, a capability to perform partial coherence transmission, and a capability to perform non-coherence transmission; and/or

both codebook based and non-codebook based transmission.

5. The UE of claim 1 wherein the rule is such that, in order to determine the power to be used for the set of antenna ports based on the power P according to the rule, the processing circuitry is further configured to:

derive a ratio α_=K ρ_0/ρ where ρ is a number of antenna ports used for the physical uplink shared channel transmission, ρ_0 is a number of antenna ports on which the physical uplink shared channel transmission is transmitted with non-zero power, and:

K=1 if the UE has full coherence transmission capability in case of codebook based transmission;

K=2 if the UE has partial coherence transmission capability in case of codebook based transmission with four antenna ports; and

K=2 or K=4 if the UE has non-coherence transmission capability in case of codebook based transmission and two or four antenna ports, respectively;

derive a second power P′ by scaling the power P with a ratio β=min{1,α}; and

equally divide the second power P′ across the set of antenna ports on which the physical uplink shared channel transmission is transmitted with non-zero power.

6. The UE of claim 1 wherein the ratio is derived by selecting the ratio from a set of predetermined values.

7. A method implemented in a User Equipment, UE, the method comprising:

deriving a power P to be used for uplink power control for a physical uplink shared channel transmission;

determining whether the UE is using codebook based transmission or non-codebook based transmission; and

determining a power to be used for a set of antenna ports based on the power P according to a rule that depends on whether the UE is utilizing codebook based transmission or non-codebook based transmission for the physical uplink shared channel transmission, the set of antenna ports being antenna ports on which the physical uplink shared channel transmission is transmitted with non-zero power,

wherein the rule is such that, for a case of non-codebook based precoding, in order to determine the power to be used for the set of antenna ports based on the power P according to the rule, the processing circuitry is further configured to equally divide the power P across the set of antenna ports on which the physical uplink shared channel transmission is transmitted with non-zero power, and

wherein the rule is such that, for a case of codebook based transmission, in order to determine the power to be used for the set of antenna ports based on the power P according to the rule, the processing circuitry is further configured to derive a second power P′ by scaling the power P with a ratio of a number of antenna ports on which the physical uplink shared channel transmission is transmitted with non-zero power to a number of Sounding Reference Signal, SRS, ports in an SRS resource at the UE, and equally divide the second power P′ across the set of antenna ports on which the physical uplink shared channel transmission is transmitted with non-zero power.

8. The method of claim 7 further comprising transmitting the physical uplink shared channel transmission using the set of antenna ports.

9. The method of claim 7 wherein the rule is such that, for a case of non-codebook based precoding and reciprocity based transmission, determining the power to be used for the set of antenna ports based on the power P according to the rule comprises:

equally dividing the power P across the set of antenna ports on which the physical uplink shared channel transmission is transmitted with non-zero power.

10. The method of claim 7 wherein the rule is such that determining the power to be used for the set of antenna ports based on the power P according to the rule comprises:

deriving a ratio α_=K ρ_0/ρ where ρ is a number of antenna ports used for the physical uplink shared channel transmission, ρ_0 is a number of antenna ports on which the physical uplink shared channel transmission is transmitted with non-zero power, and:

K=1 if the UE has full coherence transmission capability in case of codebook based transmission;

K=2 if the UE has partial coherence transmission capability in case of codebook based transmission with four antenna ports; and

K=2 or K=4 if the UE has non-coherence transmission capability in case of codebook based transmission and two or four antenna ports, respectively;

deriving a second power P′ by scaling the power P with a ratio β=min{1,α}; and

equally dividing the second power P′ across the set of antenna ports on which the physical uplink shared channel transmission is transmitted with non-zero power.

11. The method of claim 7 wherein the rule is such that determining the power to be used for the set of antenna ports based on the power P according to the rule comprises:

deriving a second power P′ by scaling the power P with a ratio, where the ratio is derived as a function depending on whether the UE is utilizing codebook based transmission or non-codebook based transmission for the physical uplink shared channel transmission and:

a capability of the UE in terms of full coherence, partial coherence, or non-coherence transmission;

a number of antenna ports, in the set of antenna ports, on which a non-zero physical uplink shared channel is transmitted;

a number of antenna ports, in the set of antenna ports, used for the physical uplink shared channel transmission; and/or

a number of antenna ports, in the set of antenna ports, at the UE.

12. A method implemented in a User Equipment, UE, the method comprising:

deriving a power P to be used for uplink power control for a physical uplink shared channel transmission;

determining whether the UE is using codebook based transmission or non-codebook transmission; and

determining a power to be used for a set of antenna ports based on the power P according to a rule that depends on a capability of the UE in terms of full coherence, partial coherence, or non-coherence transmission, the set of antenna ports being antenna ports on which the physical uplink shared channel transmission is transmitted with non-zero power,

wherein the rule is such that, for a case of non-codebook based precoding, in order to determine the power to be used for the set of antenna ports based on the power P according to the rule, the processing circuitry is further configured to equally divide the power P across the set of antenna ports on which the physical uplink shared channel transmission is transmitted with non-zero power, and

wherein the rule is such that, for a case of codebook based transmission, in order to determine the power to be used for the set of antenna ports based on the power P according to the rule, the processing circuitry is further configured to derive a second power P′ by scaling the power P with a ratio of a number of antenna ports on which the physical uplink shared channel transmission is transmitted with non-zero power to a number of Sounding Reference Signal, SRS, ports in an SRS resource at the UE, and equally divide the second power P′ across the set of antenna ports on which the physical uplink shared channel transmission is transmitted with non-zero power.

13. The method of claim 12 further comprising transmitting the physical uplink shared channel transmission using the set of antenna ports on which the physical uplink shared channel transmission is transmitted with non-zero power.

14. The method of claim 12 wherein the rule is such that, for a case of non-codebook based precoding and reciprocity based transmission, determining the power to be used for the set of antenna ports based on the power P according to the rule comprises:

equally dividing the power P across the set of antenna ports on which the physical uplink shared channel transmission is transmitted with non-zero power.

15. The method of claim 12 wherein the rule is such that determining the power to be used for the set of antenna ports based on the power P according to the rule comprises:

deriving a ratio α_=K ρ_0/ρ where ρ is a number of antenna ports used for the physical uplink shared channel transmission, ρ_0 is a number of antenna ports on which the physical uplink shared channel transmission is transmitted with non-zero power, and:

K=1 if the UE has full coherence transmission capability in case of codebook based transmission;

K=2 if the UE has partial coherence transmission capability in case of codebook based transmission with four antenna ports; and

K=2 or K=4 if the UE has non-coherence transmission capability in case of codebook based transmission and two or four antenna ports, respectively;

deriving a second power P′ by scaling the power P with a ratio β=min{1,α}; and

equally dividing the second power P′ across the set of antenna ports on which the physical uplink shared channel transmission is transmitted with non-zero power.

16. A User Equipment, UE, comprising:

processing circuitry configured to:

derive a power P to be used for uplink power control for a physical uplink shared channel transmission;

determine whether the UE is using codebook based transmission or non-codebook transmission; and

determine a power to be used for a set of antenna ports based on the power P according to a rule that depends on a capability of the UE in terms of full coherence, partial coherence, or non-coherence transmission, the set of antenna ports being antenna ports on which the physical uplink shared channel transmission is transmitted with non-zero power,

wherein the rule is such that, for a case of non-codebook based precoding, in order to determine the power to be used for the set of antenna ports based on the power P according to the rule, the processing circuitry is further configured to equally divide the power P across the set of antenna ports on which the physical uplink shared channel transmission is transmitted with non-zero power, and

wherein the rule is such that, for a case of codebook based transmission, in order to determine the power to be used for the set of antenna ports based on the power P according to the rule, the processing circuitry is further configured to derive a second power P′ by scaling the power P with a ratio of a number of antenna ports on which the physical uplink shared channel transmission is transmitted with non-zero power to a number of Sounding Reference Signal, SRS, ports in an SRS resource at the UE, and equally divide the second power P′ across the set of antenna ports on which the physical uplink shared channel transmission is transmitted with non-zero power.

17. The UE of claim 16 wherein the UE further comprises an interface, and the processing circuitry is further configured to transmit, via the interface, the physical uplink shared channel transmission using the set of antenna ports.

18. The UE of claim 16 wherein the rule is such that, for a case of non-codebook based precoding and reciprocity based transmission, in order to determine the power to be used for the set of antenna ports based on the power P according to the rule, the processing circuitry is further configured to:

equally divide the power P across the set of antenna ports on which the physical uplink shared channel transmission is transmitted with non-zero power.

19. The UE of claim 16 wherein the rule is such that, in order to determine the power to be used for the set of antenna ports based on the power P according to the rule, the processing circuitry is further configured to:

derive a ratio α_=K ρ_0/ρ where ρ is a number of antenna ports used for the physical uplink shared channel transmission, ρ_0 is a number of antenna ports on which the physical uplink shared channel transmission is transmitted with non-zero power, and:

K=1 if the UE has full coherence transmission capability in case of codebook based transmission;

K=2 if the UE has partial coherence transmission capability in case of codebook based transmission with four antenna ports; and

K=2 or K=4 if the UE has non-coherence transmission capability in case of codebook based transmission and two or four antenna ports, respectively;

derive a second power P′ by scaling the power P with a ratio β=min{1,α}; and

equally divide the second power P′ across the set of antenna ports on which the physical uplink shared channel transmission is transmitted with non-zero power.

20. The UE of claim 16 wherein the ratio is derived by selecting the ratio from a set of predetermined values.