ANTENNA GROUP-SPECIFIC PARAMETER CONFIGURATION IN MILLIMETER WAVE COMMUNICATIONS

1 . An apparatus for wireless communications at a first wireless device, comprising:

one or more memories storing processor-executable code; and

one or more processors coupled with the one or more memories and configured to cause the first wireless device to:

transmit, to a second wireless device, an indication of one or more different sets of antenna elements for communications with the second wireless device, wherein the one or more different sets of antenna elements include a number of antenna elements from a plurality of antenna elements of the first wireless device;

receive, from the second wireless device, one or more training signals as part of a beam training procedure for the first wireless device, wherein the beam training procedure is based on the indication of the one or more different sets of antenna elements;

select a beam preferred by the first wireless device; and

communicate, with the second wireless device, using one set of antenna elements of the one or more different sets of antenna elements, wherein the one set of antenna elements used for communication is associated with the selected beam, wherein the communication is based on one or more transmission control parameters, and wherein the one or more transmission control parameters include a maximum transmittable power parameter determined based on the number of antenna elements of the one set of antenna elements used for the communication.

2 . The apparatus of claim 1 , wherein the one or more processors are further configured to cause the first wireless device to:

select, at the first wireless device, a preferred beam as part of the beam training procedure; and

provide, to the second wireless device, feedback on the selection of the preferred beam.

3 . The apparatus of claim 2 , wherein the feedback on the selection of the preferred beam is indicated via an indication of a transmission configuration indication state.

4 . The apparatus of claim 1 , wherein the one or more transmission control parameters transmitted by the first wireless device to the second wireless device comprise:

an array size of one or more sets of antenna elements,

an array geometry of the one or more sets of antenna elements, or

information associated with a beam pattern of the one or more sets of antenna elements, wherein the information includes beamwidths, side lobe levels, array gains, or any combinations thereof.

5 . The apparatus of claim 1 , wherein the one or more processors are further configured to cause the first wireless device to:

receive, from the second wireless device, a configuration that corresponds to a digital beamforming codebook for the one set of antenna elements used for the communication; and

receive, from the second wireless device, a digital beamforming configuration that indicates the digital beamforming codebook to be used for the communication between the first wireless device and the second wireless device.

6 . The apparatus of claim 5 , wherein the digital beamforming configuration is received via downlink control information with a resource grant.

7 . The apparatus of claim 1 , wherein the one or more transmission control parameters are used by the first wireless device to:

determine a modulation and coding scheme-dependent phase compensation parameter,

wherein the modulation and coding scheme-dependent phase compensation parameter is determined based on the number of antenna elements of the one set of antenna elements used for the communication.

8 . The apparatus of claim 1 , wherein, to receive the one or more training signals, the one or more processors are further configured to cause the first wireless device to:

measure the one or more training signals received from the second wireless device using the one or more different sets of antenna elements;

transmit a measurement report to the second wireless device that indicates the one set of antenna elements of the one or more different sets of antenna elements, the one or more transmission control parameters, or both; and

receive an indication from the second wireless device that the one set of antenna elements of the one or more different sets of antenna elements is to be used for the communication with the second wireless device.

9 . The apparatus of claim 1 , wherein:

the first wireless device is a user equipment, UE, or a customer premises equipment in a wireless communications system, and

the second wireless device is a network entity, a customer premises equipment, a relay device, a router, a repeater, or an integrated access and backhaul (IAB) node in the wireless communications system.

10 . An apparatus for wireless communications at a second wireless device, comprising:

one or more memories storing processor-executable code; and

one or more processors coupled with the one or more memories and configured to cause the second wireless device to:

obtain an indication of one or more different sets of antenna elements for communications with the second wireless device, wherein the one or more different sets of antenna elements include a number of antenna elements from a plurality of antenna elements of a first wireless device;

output one or more training signals as part of a beam training procedure for the first wireless device, wherein the beam training procedure is based on the indication of the one or more different sets of antenna elements; and

communicate with the first wireless device using one set of antenna elements of the one or more different sets of antenna elements, wherein the one set of antenna elements used for communication is associated with a preferred beam, wherein the communication is based on one or more transmission control parameters, and wherein the one or more transmission control parameters include a maximum transmittable power parameter determined based on the number of antenna elements of the one set of antenna elements used for the communication.

11 . The second wireless device of claim 10 wherein the one or more processors are further configured to cause the second wireless device to:

obtain feedback on the preferred beam.

12 . The second wireless device of claim 11 , wherein the feedback on the preferred beam is received via an indication of a transmission configuration indication state.

13 . The second wireless device of claim 10 , wherein the one or more transmission control parameters received from the first wireless device comprise:

an array size of one or more sets of antenna elements,

an array geometry of the one or more sets of antenna elements, or

information associated with a beam pattern of the one or more sets of antenna elements, wherein the information includes beamwidths, side lobe levels, array gains, or any combinations thereof.

14 . The second wireless device of claim 10 , wherein the one or more processors are further configured to cause the second wireless device to:

output a configuration that corresponds to a digital beamforming codebook for the one set of antenna elements used for the communication; and

output a digital beamforming configuration that indicates the digital beamforming codebook to be used for the communication between the first wireless device and the second wireless device.

15 . The second wireless device of claim 14 , wherein the digital beamforming configuration is output via downlink control information with a resource grant.

16 . The second wireless device of claim 10 , wherein, to output the one or more training signals, the one or more processors are further configured to cause the second wireless device to:

obtain a measurement report that indicates the one set of antenna elements of the one or more different sets of antenna elements, the one or more transmission control parameters, or both in accordance with a measurement of the one or more training signals by the first wireless device using the one or more different sets of antenna elements; and

output an indication that the one set of antenna elements of the one or more different sets of antenna elements is to be used for the communication with the second wireless device.

17 . The second wireless device of claim 10 , wherein:

the first wireless device is a user equipment, UE, or a customer premises equipment in a wireless communications system, and

the second wireless device is a network entity, a customer premises equipment, a relay device, a router, a repeater, or an integrated access and backhaul (IAB) node in the wireless communications system.

18 . A method for wireless communications at a first wireless device, comprising:

transmitting, to a second wireless device, an indication of one or more different sets of antenna elements for communications with the second wireless device, wherein the one or more different sets of antenna elements include a number of antenna elements from a plurality of antenna elements of the first wireless device;

receiving, from the second wireless device, one or more training signals as part of a beam training procedure for the first wireless device, wherein the beam training procedure is based on the indication of the one or more different sets of antenna elements;

selecting a beam preferred by the first wireless device; and

communicating, with the second wireless device, using one set of antenna elements of the one or more different sets of antenna elements, wherein the one set of antenna elements used for communication is associated with the selected beam, wherein the communication is based on one or more transmission control parameters, and wherein the one or more transmission control parameters include a maximum transmittable power parameter determined based on the number of antenna elements of the one set of antenna elements used for the communication.

19 . The method of claim 18 , further comprising:

select, at the first wireless device, a preferred beam as part of the beam training procedure; and

providing, to the second wireless device, feedback on the selection of the preferred beam.

20 . The method of claim 19 , further comprising:

transmitting an indication of a transmission configuration indication state that provides the feedback on the selection of the preferred beam.

21 . The method of claim 18 , further comprising:

receiving, from the second wireless device, a configuration that corresponds to a digital beamforming codebook for the one set of antenna elements used for the communication; and

receiving, from the second wireless device, a digital beamforming configuration that indicates the digital beamforming codebook to be used for the communication between the first wireless device and the second wireless device.

22 . The method of claim 21 , wherein the digital beamforming configuration is received via downlink control information with a resource grant.

23 . The method of claim 18 , wherein the one or more transmission control parameters are used by the first wireless device to determine a modulation and coding scheme-dependent phase compensation parameter, wherein the modulation and coding scheme-dependent phase compensation parameter is determined based on the number of antenna elements of the one set of antenna elements used for the communication.

24 . The method of claim 18 , wherein receiving the one or more training signals further comprises:

measuring the one or more training signals received from the second wireless device using the one or more different sets of antenna elements;

transmitting a measurement report to the second wireless device that indicates the one set of antenna elements of the one or more different sets of antenna elements, the one or more transmission control parameters, or both; and

receiving an indication from the second wireless device that the one set of antenna elements of the one or more different sets of antenna elements is to be used for the communication with the second wireless device.

25 . A method for wireless communications at a second wireless device, comprising:

obtaining an indication of one or more different sets of antenna elements for communications with the second wireless device, wherein the one or more different sets of antenna elements include a number of antenna elements from a plurality of antenna elements of a first wireless device;

outputting one or more training signals as part of a beam training procedure for the first wireless device, wherein the beam training procedure is based on the indication of the one or more different sets of antenna elements; and

communicating with the first wireless device using one set of antenna elements of the one or more different sets of antenna elements, wherein the one set of antenna elements used for communication is associated with a preferred beam, wherein the communication is based on one or more transmission control parameters, and wherein the one or more transmission control parameters include a maximum transmittable power parameter determined based on the number of antenna elements of the one set of antenna elements used for the communication.

26 . The method of claim 25 , further comprising:

obtaining feedback on the preferred beam.

27 . The method of claim 26 , wherein the feedback on the preferred beam is received via an indication of a transmission configuration indication state.

28 . The method of claim 25 , further comprising:

outputting a configuration that corresponds to a digital beamforming codebook for the one set of antenna elements used for the communication; and

outputting a digital beamforming configuration that indicates the digital beamforming codebook to be used for the communication between the first wireless device and the second wireless device.

29 . The method of claim 28 , wherein the digital beamforming configuration is transmitted via downlink control information with a resource grant.

30 . The method of claim 25 , wherein outputting the one or more training signals further comprises:

obtaining a measurement report that indicates the one set of antenna elements of the one or more different sets of antenna elements, the one or more transmission control parameters, or both in accordance with a measurement of the one or more training signals by the first wireless device using the one or more different sets of antenna elements; and

outputting an indication that the one set of antenna elements of the one or more different sets of antenna elements is to be used for the communication with the second wireless device.