Radio frequency exposure evaluation per surface

1 . A method of wireless communication by a wireless device, comprising:

accessing radio frequency (RF) exposure information associated with different surfaces among a plurality of surfaces of the wireless device, wherein the RF exposure information includes a plurality of exposure parameters associated with the different surfaces; and

transmitting a signal at a transmit power determined based at least in part on the RF exposure information and an RF exposure limit.

2 . The method of claim 1 , wherein at least one of the plurality of exposure parameters is indicative of a normalized RF exposure ratio associated with a particular surface among the plurality of surfaces.

3 . The method of claim 1 , wherein at least one of the plurality of exposure parameters is indicative of a maximum time-averaged transmit power associated with a particular surface among the plurality of surfaces.

4 . The method of claim 1 , wherein at least one of the plurality of exposure parameters has a default value.

5 . The method of claim 4 , wherein the default value is equal to a normalized maximum RF exposure design target.

6 . The method of claim 1 , wherein the RF exposure information includes sets of one or more exposure parameters associated with different exposure scenarios.

7 . The method of claim 1 , wherein:

the RF exposure information includes a first set of one or more exposure parameters and a second set of one or more exposure parameters;

the first set of one or more exposure parameters corresponds to a first exposure scenario; and

the second set of one or more exposure parameters corresponds to a second exposure scenario different from the first exposure scenario.

8 . The method of claim 7 , wherein:

the first set of one or more exposure parameters includes two exposure parameters corresponding to a single surface of the wireless device in two different positions; and

the second set of one or more exposure parameters includes six exposure parameters corresponding to six surfaces of the wireless device.

9 . The method of claim 8 , wherein the first exposure scenario corresponds to a head exposure scenario.

10 . The method of claim 8 , wherein the second exposure scenario corresponds to a hotspot exposure scenario or an extremity exposure scenario.

11 . The method of claim 1 , wherein the plurality of exposure parameters are associated with a subset of the different surfaces.

12 . The method of claim 1 , wherein the plurality of exposure parameters are associated with all of the different surfaces.

13 . The method of claim 1 , wherein the RF exposure information includes sets of one or more exposure parameters associated with different beams among a plurality of beams.

14 . The method of claim 1 , wherein the RF exposure information includes sets of one or more exposure parameters associated with different frequency bands, different antennas, or a combination thereof.

15 . The method of claim 1 , wherein the RF exposure information includes sets of one or more exposure parameters associated with different frequency bands, different antenna arrays, or a combination thereof.

16 . The method of claim 1 , wherein the RF exposure information includes sets of one or more exposure parameters associated with different frequency bands, different antennas, different antenna arrays, different radio access technologies, different surfaces of the wireless device, different positions of the wireless device, or a combination thereof.

17 . The method of claim 1 , further comprising:

determining allowed transmit powers per surface among two or more of the different surfaces of the wireless device using the RF exposure information based at least in part on the RF exposure limit;

selecting a smallest value among the allowed transmit powers; and

transmitting the signal at the transmit power being less than or equal to the selected value.

18 . The method of claim 17 , wherein determining the allowed transmit powers comprises determining the allowed transmit powers in a future time interval such that a time-averaged value of the allowed transmit powers and past exposure over a time window satisfies the RF exposure limit.

19 . An apparatus for wireless communication, comprising:

one or more memories collectively storing computer-executable instructions; and

one or more processors coupled to the one or more memories, the one or more processors being collectively configured to execute the computer-executable instructions to cause the apparatus to perform an operation comprising:

accessing radio frequency (RF) exposure information associated with different surfaces among a plurality of surfaces of the apparatus, wherein the RF exposure information includes a plurality of exposure parameters associated with the different surfaces; and

transmitting a signal at a transmit power determined based at least in part on the RF exposure information and an RF exposure limit.

20 . The apparatus of claim 19 , wherein at least one of the plurality of exposure parameters is indicative of a normalized RF exposure ratio associated with a particular surface among the plurality of surfaces.

21 . The apparatus of claim 19 , wherein at least one of the plurality of exposure parameters is indicative of a maximum time-averaged transmit power associated with a particular surface among the plurality of surfaces.

22 . The apparatus of claim 19 , wherein at least one of the plurality of exposure parameters has a default value.

23 . The apparatus of claim 22 , wherein the default value is equal to a normalized maximum RF exposure design target.

24 . The apparatus of claim 19 , wherein the RF exposure information includes sets of one or more exposure parameters associated with different exposure scenarios.

25 . The apparatus of claim 19 , wherein:

the RF exposure information includes a first set of one or more exposure parameters and a second set of one or more exposure parameters;

the first set of one or more exposure parameters corresponds to a first exposure scenario; and

the second set of one or more exposure parameters corresponds to a second exposure scenario different from the first exposure scenario.

26 . The apparatus of claim 25 , wherein:

the first set of one or more exposure parameters includes two exposure parameters corresponding to a single surface of the apparatus in two different positions; and

the second set of one or more exposure parameters includes six exposure parameters corresponding to six surfaces of the apparatus.

27 . An apparatus for wireless communication, comprising:

means for accessing radio frequency (RF) exposure information associated with different surfaces among a plurality of surfaces of the apparatus, wherein the RF exposure information includes a plurality of exposure parameters associated with the different surfaces; and

means for transmitting a signal at a transmit power determined based at least in part on the RF exposure information and an RF exposure limit.

28 . A non-transitory computer-readable medium having instructions stored thereon for:

accessing radio frequency (RF) exposure information associated with different surfaces among a plurality of surfaces of a wireless device, wherein the RF exposure information includes a plurality of exposure parameters associated with the different surfaces; and

transmitting a signal at a transmit power determined based at least in part on the RF exposure information and an RF exposure limit.

29 . The non-transitory computer-readable medium of claim 28 , wherein at least one of the plurality of exposure parameters is indicative of a normalized RF exposure ratio associated with a particular surface among the plurality of surfaces.

30 . The apparatus of claim 27 , wherein at least one of the plurality of exposure parameters is indicative of a normalized RF exposure ratio associated with a particular surface among the plurality of surfaces.