Beam management enhancements for mmWave operations

1. A method of wireless communication, comprising:

receiving, at a user equipment (UE) using a plurality of receiver diversity branches, a channel state information (CSI) reporting configuration message from a serving base station, wherein the CSI reporting configuration message identifies:

a set of CSI resources for reporting CSI of a plurality of beams by the UE; and

a beam management reporting mode for ranking beams and reporting ranked beams;

measuring, by the UE, an interference plus noise metric of a first signaling resource of each beam of the plurality of beams;

measuring by the UE, a power contribution metric of a second signaling resource of the each beam of the plurality of beams;

ranking, by the UE, the plurality of beams based on the beam management reporting mode including a ranking parameter, wherein the ranking parameter includes one of: the interference plus noise metric, or the power contribution metric;

selecting, by the UE, a subset of highest ranked beams from the plurality of beams according to the ranking; and

transmitting, by the UE, identification of the subset of highest ranked beams to the serving base station via the set of CSI resources.

2. The method of claim 1 , wherein the ranking includes ranking the plurality of beams based on the interference plus noise metric.

3. The method of claim 2 , further including:

selecting, by the UE, a second subset of beams from the plurality of beams based on the power contribution metric; and

transmitting, by the UE, a second identification of the second subset of beams to the serving base station.

4. The method of claim 2 , wherein:

the selecting of the subset of highest ranked beams comprises selecting beams from among the plurality of beams such that each of the selected beams has a respective power contribution metric that exceeds a predetermined power contribution threshold.

5. The method of claim 1 , wherein:

the selecting of the subset of highest ranked beams comprises selecting beams from among the ranked plurality of beams such that each of the selected beams has a respective interference plus noise metric that exceeds a predetermined interference plus noise threshold.

6. The method of claim 1 , wherein the transmitting further includes:

transmitting the interference plus noise metric and the power contribution metric for each beam of the subset of highest ranked beams.

7. The method of claim 1 , wherein the measuring the first signaling resource includes:

measuring a plurality of instances of the first signaling resource within a same transmission configuration indicator (TCI) state; and

one of:

averaging a plurality of interference plus noise measurements of the plurality of instances of the first signaling resource for the interference plus noise metric; or

selecting a maximum interference plus noise measurement of the plurality of instances of the first signaling resource for the interference plus noise metric; or

selecting a minimum interference plus noise measurement of the plurality of instances of the first signaling resource for the interference plus noise metric.

8. The method of claim 1 , wherein the first signaling resource is a same resource as the second signaling resource.

9. The method of claim 1 ,

wherein the measuring of the interference plus noise metric includes one of:

calculating an average interference plus noise metric of interference plus noise measurements of each of the plurality of receiver diversity branches, wherein the average interference plus noise metric corresponds to the interference plus noise metric;

identifying a minimum interference plus noise metric of the plurality of receiver diversity branches, wherein the minimum interference plus noise metric corresponds to the interference plus noise metric;

identifying a maximum interference plus noise metric of the plurality of receiver diversity branches, wherein the maximum interference plus noise metric corresponds to the interference plus noise metric; or

calculating an effective interference plus noise metric based on a sum-capacity measurement of interference plus noise using the plurality of receiver diversity branches, wherein the effective interference plus noise metric corresponds to the interference plus noise metric.

10. The method of claim 1 , wherein the CSI reporting configuration message specifies a quantity of beams for the UE to report in the subset of highest ranked beams.

11. An apparatus configured for wireless communication, comprising:

means for receiving, at a user equipment (UE) using a plurality of receiver diversity branches, a channel state information (CSI) reporting configuration message from a serving base station, wherein the CSI reporting configuration message identifies:

a set of CSI resources for reporting CSI of a plurality of beams by the UE; and

a beam management reporting mode for ranking beams and reporting ranked beams;

means for measuring, by the UE, an interference plus noise metric of a first signaling resource of each beam of the plurality of beams;

means for measuring by the UE, a power contribution metric of a second signaling resource of the each beam of the plurality of beams;

means for ranking, by the UE, the plurality of beams based on the beam management reporting mode including a ranking parameter, wherein the ranking parameter includes one of:

the interference plus noise metric, or the power contribution metric;

means for selecting, by the UE, a subset of highest ranked beams from the plurality of beams according to results of the means for ranking; and

means for transmitting, by the UE, identification of the subset of highest ranked beams to the serving base station via the set of CSI resources.

12. The apparatus of claim 11 , wherein the means for ranking includes means for ranking the plurality of beams based on the interference plus noise metric.

13. The apparatus of claim 12 , further including:

means for selecting, by the UE, a second subset of beams from the plurality of beams based on the power contribution metric; and

means for transmitting, by the UE, a second identification of the second subset of beams to the serving base station.

14. The apparatus of claim 12 , wherein the means for selecting of the subset of highest ranked beams comprises means for selecting beams from among the plurality of beams such that each of the selected beams has a respective power contribution metric that exceeds a predetermined power contribution threshold.

15. The apparatus of claim 11 , wherein the means for selecting of the subset of highest ranked beams comprises means for selecting beams from among the ranked plurality of beams such that each of the selected beams has a respective interference plus noise metric that exceeds a predetermined interference plus noise threshold.

16. The apparatus of claim 11 , wherein the means for transmitting further include:

means for transmitting the interference plus noise metric and the power contribution metric for each beam of the subset of highest ranked beams.

17. The apparatus of claim 11 , wherein the means for measuring the first signaling resource includes:

means for measuring a plurality of instances of the first signaling resource within a same transmission configuration indicator (TCI) state; and

one of:

means for averaging a plurality of interference plus noise measurements of the plurality of instances of the first signaling resource for the interference plus noise metric; or

means for selecting a maximum interference plus noise measurement of the plurality of instances of the first signaling resource for the interference plus noise metric; or

means for selecting a minimum interference plus noise measurement of the plurality of instances of the first signaling resource for the interference plus noise metric.

18. The apparatus of claim 11 , wherein the first signaling resource is a same resource as the second signaling resource.

19. The apparatus of claim 11 ,

wherein the means for measuring of the interference plus noise metric includes one of:

means for calculating an average interference plus noise metric of interference plus noise measurements of each of the plurality of receiver diversity branches, wherein the average interference plus noise metric corresponds to the interference plus noise metric;

means for identifying a minimum interference plus noise metric of the plurality of receiver diversity branches, wherein the minimum interference plus noise metric corresponds to the interference plus noise metric;

means for identifying a maximum interference plus noise metric of the plurality of receiver diversity branches, wherein the maximum interference plus noise metric corresponds to the interference plus noise metric; or

means for calculating an effective interference plus noise metric based on a sum-capacity measurement of interference plus noise using the plurality of receiver diversity branches, wherein the effective interference plus noise metric corresponds to the interference plus noise metric.

20. The apparatus of claim 11 , wherein the CSI reporting configuration message specifies a quantity of beams for the UE to report in the subset of highest ranked beams.

21. An apparatus configured for wireless communication, the apparatus comprising:

at least one processor; and

a memory coupled to the at least one processor,

wherein the at least one processor is configured:

to receive, at a user equipment (UE) using a plurality of receiver diversity branches, a channel state information (CSI) reporting configuration message from a serving base station, wherein the CSI reporting configuration message identifies:

a set of CSI resources for reporting CSI of a plurality of beams by the UE, and

a beam management reporting mode for ranking beams and reporting ranked beams;

to measure, by the UE, an interference plus noise metric of a first signaling resource of each beam of the plurality of beams;

to measure by the UE, a power contribution metric of a second signaling resource of the each beam of the plurality of beams;

to rank, by the UE, the plurality of beams based on the beam management reporting mode including a ranking parameter, wherein the ranking parameter includes one of: the interference plus noise metric, or the power contribution metric;

to select, by the UE, a subset of highest ranked beams from the plurality of beams according to execution of a configuration of the at least one processor to rank; and

to transmit, by the UE, identification of the subset of highest ranked beams to the serving base station via the set of CSI resources.

22. The apparatus of claim 21 , wherein the configuration of the at least one processor to rank includes configuration to rank the plurality of beams based on the interference plus noise metric.

23. The apparatus of claim 22 , further including configuration of the at least one processor:

to select, by the UE, a second subset of beams from the plurality of beams based on the power contribution metric; and

to transmit, by the UE, a second identification of the second subset of beams to the serving base station.

24. The apparatus of claim 22 , wherein the configuration of the at least one processor to select of the subset of highest ranked beams comprises configuration of the at least one processor to select beams from among the plurality of beams such that each of the selected beams has a respective power contribution metric that exceeds a predetermined power contribution threshold.

25. The apparatus of claim 21 , wherein the configuration of the at least one processor to rank includes configuration of the at least one processor:

to rank the plurality of beams based on the power contribution metric;

to compare the interference plus noise metric of each beam of the plurality of beams against a predetermined interference plus noise threshold; and

to select the subset of beams according to the interference plus noise metric of the each beam exceeding the predetermined interference plus noise threshold.

26. The apparatus of claim 21 , wherein the configuration of the at least one processor to transmit further includes configuration to transmit the interference plus noise metric and the power contribution metric for each beam of the subset of highest ranked beams.

27. The apparatus of claim 21 , wherein the configuration of the at least one processor to measure the first signaling resource includes configuration of the at least one processor:

to measure a plurality of instances of the first signaling resource within a same transmission configuration indicator (TCI) state; and

configuration of the at least one processor to one of:

average a plurality of interference plus noise measurements of the plurality of instances of the first signaling resource for the interference plus noise metric; or

select a maximum interference plus noise measurement of the plurality of instances of the first signaling resource for the interference plus noise metric; or

select a minimum interference plus noise measurement of the plurality of instances of the first signaling resource for the interference plus noise metric.

28. The apparatus of claim 21 , wherein the first signaling resource is a same resource as the second signaling resource.

29. The apparatus of claim 21 ,

wherein the configuration of the at least one processor to measure the interference plus noise metric includes configuration of the at least one processor to one of:

calculate an average interference plus noise metric of interference plus noise measurements of each of the plurality of receiver diversity branches, wherein the average interference plus noise metric corresponds to the interference plus noise metric;

identify a minimum interference plus noise metric of the plurality of receiver diversity branches, wherein the minimum interference plus noise metric corresponds to the interference plus noise metric;

identify a maximum interference plus noise metric of the plurality of receiver diversity branches, wherein the maximum interference plus noise metric corresponds to the interference plus noise metric; or

calculate an effective interference plus noise metric based on a sum-capacity measurement of interference plus noise using the plurality of receiver diversity branches, wherein the effective interference plus noise metric corresponds to the interference plus noise metric.

30. The apparatus of claim 21 , wherein the CSI reporting configuration message specifies a quantity of beams for the UE to report in the subset of highest ranked beams.