SRS power control methods for channel estimation of reconfigurable intelligent surface link

1 . A method for wireless communication at a user equipment (UE), comprising:

receiving, from a base station via a configurable reflective surface, signaling indicating a switch from a first power control mode to a second power control mode for sounding reference signal transmissions;

transmitting, to the base station and in the second power control mode, a report indicating a power headroom associated with the sounding reference signal transmissions based at least in part on receiving the signaling indicating the switch; and

communicating with the base station over a wireless channel based at least in part on transmitting the report indicating the power headroom;

wherein communication with the base station over the wireless channel includes communicating via a configurable reflective surface that is configured to deflect communications from the UE and the base station.

2 . The method of claim 1 , wherein the first power control mode comprises one of an open-loop power control mode or a closed-loop power control mode and the second power control mode comprises the other of the open-loop power control mode and the closed-loop power control mode.

3 . The method of claim 1 , further comprising:

transmitting, to the base station and in the second power control mode, a sounding reference signal associated with the report indicating the power headroom, wherein communicating with the base station is based at least in part on transmitting the sounding reference signal.

4 . The method of claim 1 , wherein transmitting the report to the base station comprises:

transmitting the report to the base station via the configurable reflective surface.

5 . The method of claim 1 , wherein the signaling comprises downlink control information indicating the switch, a medium access control (MAC) control element indicating the switch, or radio resource control signaling indicating the switch.

6 . A method for wireless communication at a base station, comprising:

transmitting, to a user equipment (UE) via a configurable reflective surface, signaling indicating a switch from a first power control mode to a second power control mode for sounding reference signal transmissions;

receiving, from the UE and in the second power control mode, a report indicating a power headroom associated with the sounding reference signal transmissions based at least in part on transmitting the signaling indicating the switch;

estimating a sounding reference signal transmission power based at least in part on receiving the report indicating the power headroom; and

communicating with the UE over a wireless channel based at least in part on the estimated sounding reference signal transmission power;

wherein communication with the UE over the wireless channel includes communicating via a configurable reflective surface that is configured to deflect communications from the UE and the base station.

7 . The method of claim 6 , wherein the first power control mode comprises one of an open-loop power control mode or a closed-loop power control mode and the second power control mode comprises the other of the open-loop power control mode and the closed-loop power control mode.

8 . The method of claim 6 , further comprising:

determining a value of a first channel condition parameter associated with the UE based at least in part on the estimated sounding reference signal transmission power associated with the report indicating the power headroom and a value of a second channel condition parameter associated with a second UE, wherein communicating with the UE over the wireless channel is based at least in part on determining the value of the first channel condition parameter.

9 . The method of claim 8 , wherein receiving the report indicating the power headroom from the UE comprises receiving the report from the UE via a configurable reflective surface, the method further comprising:

determining a value of a scalar factor associated with a channel condition between the UE and the configurable reflective surface based at least in part on the estimated sounding reference signal transmission power associated with the report indicating the power headroom, wherein determining the value of the first channel condition parameter comprises combining the value of the scalar factor and the value of the second channel condition parameter.

10 . The method of claim 9 , further comprising:

receiving, from the UE and in the second power control mode, a sounding reference signal associated with the report indicating the power headroom, wherein determining the value of the scalar factor is based at least in part on receiving the sounding reference signal.

11 . The method of claim 9 , wherein the first channel condition parameter and the second channel condition parameter are each associated with a same channel condition between the configurable reflective surface and the base station.

12 . The method of claim 6 , wherein receiving the report indicating the power headroom from the UE comprises:

receiving the report indicating the power headroom from the UE via the configurable reflective surface.

13 . The method of claim 6 , wherein the signaling comprises downlink control information indicating the switch, a medium access control (MAC) control element indicating the switch, or radio resource control signaling indicating the switch.

14 . A method for wireless communication at a user equipment (UE), comprising:

receiving, from a base station via a configurable reflective surface, a request for one or more reports that indicate a transmission power at which the UE transmits a sounding reference signal;

transmitting the one or more reports to the base station based at least in part on receiving the request for the one or more reports;

transmitting the sounding reference signal to the base station; and

communicating with the base station over a wireless channel based at least in part on the one or more reports and the sounding reference signal;

wherein communication with the base station over the wireless channel includes communicating via a configurable reflective surface that is configured to deflect communications from the UE and the base station.

15 . The method of claim 14 , wherein transmitting the sounding reference signal to the base station comprises:

transmitting the sounding reference signal to the base station via the configurable reflective surface.

16 . The method of claim 14 , wherein transmitting the one or more reports to the base station comprises:

transmitting the one or more reports to the base station via the configurable reflective surface.

17 . The method of claim 14 , wherein:

downlink control information comprises the request, a medium access control (MAC) control element comprises the request, or radio resource control signaling comprises the request.

18 . The method of claim 14 , wherein transmitting the one or more reports to the base station comprises:

transmitting, to the base station, uplink control information that comprises the one or more reports.

19 . The method of claim 18 , wherein the uplink control information is transmitted periodically via an uplink control channel transmission, transmitted via an uplink shared channel transmission, or both.

20 . The method of claim 14 , wherein the one or more reports comprise a plurality of reports, wherein one or more bits from each of the plurality of reports cumulatively indicate the transmission power.

21 . The method of claim 20 , wherein the plurality of reports comprise a first report and a second report, wherein the one or more bits of the first report comprise a set of most significant bits corresponding to the transmission power and the one or more bits of the second report comprise a set of least significant bits corresponding to the transmission power.

22 . The method of claim 20 , wherein each report of the plurality of reports is transmitted within a different uplink slot.

23 . The method of claim 14 , wherein the sounding reference signal is transmitted after the one or more reports are transmitted.

24 . A method for wireless communication at a base station, comprising:

transmitting, to a user equipment (UE) via a configurable reflective surface, a request for one or more reports that indicate a transmission power at which the UE transmits a sounding reference signal;

receiving the one or more reports from the UE based at least in part on transmitting the request for the one or more reports;

receiving the sounding reference signal; and

communicating with the UE over a wireless channel based at least in part on the one or more reports and the sounding reference signal;

wherein communication with the UE over the wireless channel includes communicating via a configurable reflective surface that is configured to deflect communications from the UE and the base station.

25 . The method of claim 24 , further comprising:

determining a value of a first channel condition parameter associated with the UE based at least in part on the one or more reports and a value of a second channel condition parameter associated with a second UE, wherein communicating with the UE over the wireless channel is based at least in part on determining the value of the first channel condition parameter.

26 . The method of claim 25 , wherein receiving the sounding reference signal from the UE comprises receiving the sounding reference signal via a configurable reflective surface, the method further comprising:

determining a value of a scalar factor associated with a channel condition between the UE and the configurable reflective surface based at least in part on the one or more reports, wherein determining the value of the first channel condition parameter comprises combining the value of the scalar factor and the value of the second channel condition parameter.

27 . The method of claim 24 , wherein receiving the sounding reference signal from the UE comprises:

receiving the sounding reference signal from the UE via the configurable reflective surface.

28 . The method of claim 24 , wherein receiving the one or more reports from the base station comprises:

receiving the one or more reports from the base station via the configurable reflective surface.

29 . The method of claim 24 , wherein:

downlink control information comprises the request, a medium access control (MAC) control element comprises the request, or radio resource control signaling comprises the request.

30 . The method of claim 24 , wherein receiving the one or more reports from the UE comprises:

receiving, from the UE, uplink control information that comprises the one or more reports.

31 . An apparatus for wireless communication at a user equipment (UE), comprising:

a processor,

memory in electronic communication with the processor, and

instructions stored in the memory and executable by the processor to cause the apparatus to:

receive, from a base station via a configurable reflective surface, signaling indicating a switch from a first power control mode to a second power control mode for sounding reference signal transmissions;

transmit, to the base station and in the second power control mode, a report indicating a power headroom associated with the sounding reference signal transmissions based at least in part on receiving the signaling indicating the switch; and

communicate with the base station over a wireless channel based at least in part on transmitting the report indicating the power headroom;

wherein communication with the base station over the wireless channel includes communicating via a configurable reflective surface that is configured to deflect communications from the UE and the base station.