# US 12,225,478 B2 · Exception-robust time-averaged radio frequency exposure compliance continuity > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,225,478 B2 - Document ID: US12225478B2 - Status: Granted - Kind: B2 - Application number: 18/341,561 - Filed: 2023-06-26 - Published: 2023-10-26 - Granted: 2025-02-11 - Earliest claimed: 2020-09-11 - Assignees: QUALCOMM Incorporated - Applicants: QUALCOMM Incorporated - Inventors: Troy Curtiss; Akhil Deodhar; Jagadish Nadakuduti; Lin Lu; Paul Guckian - Web page: https://patentgrep.com/patent/US12225478B2 ## CPC - H04W 52/245: {taking into account received signal strength} - H04W 52/367: {Power values between minimum and maximum limits, e.g. dynamic range} - H04B 17/101: {for measurement of specific parameters of the transmitter or components thereof} - H04L 1/0061: {Error detection codes} - H04W 52/225: {Calculation of statistics, e.g. average or variance} - H04W 52/228: {using past power values or information} - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - H04B: TRANSMISSION - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract Certain aspects of the present disclosure provide techniques for exception-robust time-averaged radio frequency (RF) exposure compliance continuity. A method that may be performed by a user equipment (UE) generally includes transmitting a first signal at a first transmission power based on time-averaged RF exposure measurements over a time window and storing RF exposure information associated with the time window. The method may also include detecting that an exception event associated with the UE occurred and transmitting a second signal at a second transmission power based at least in part on the stored RF exposure information in response to the detection of the event. ## Claims ### Claim 1 A method of wireless communication by a wireless device, comprising: transmitting a first signal at a first transmission power based on time-averaged radio frequency (RF) exposure measurements over a time window; storing RF exposure information associated with the time window in a memory of the wireless device and in a modem and storing a timestamp associated with the RF exposure information in the memory, the memory being distinct from the modem; detecting that an exception event associated with the wireless device occurred; and transmitting a second signal at a second transmission power based at least in part on the RF exposure information stored in the memory in response to the detection of the exception event. ### Claim 2 (depends on 1) The method of claim 1, wherein the timestamp corresponds to a time when the first signal was transmitted. ### Claim 3 (depends on 2) The method of claim 2, wherein the RF exposure information comprises at least one of a history of transmission powers or the time-averaged RF exposure measurements. ### Claim 4 (depends on 1) The method of claim 1, further comprising obtaining the timestamp from a counter resistant to the exception event, wherein transmitting the second signal comprises transmitting the second signal at the second transmission power based at least in part on the RF exposure information stored in the memory in response to the detection of the exception event and in response to a determination that the timestamp associated with the RF exposure information is within a current time window. ### Claim 5 (depends on 1) The method of claim 1, wherein the exception event results in unknown RF exposure for a time period. ### Claim 6 (depends on 1) The method of claim 1, wherein the wireless device ceases communication during the exception event. ### Claim 7 (depends on 6) The method of claim 6, wherein a particular level of RF exposure is associated with the exception event. ### Claim 8 (depends on 1) The method of claim 1, wherein the memory is resistant to corruption from the exception event and wherein the modem is not resistant to corruption. ### Claim 9 (depends on 1) The method of claim 1, wherein transmitting the second signal comprises transmitting the second signal at the second transmission power based on supplementing the time-averaged RF exposure measurements with the RF exposure information stored in the memory. ### Claim 10 (depends on 1) The method of claim 1, wherein the exception event includes at least one of an error, a reset, a crash, or a reboot affecting an operation of the wireless device or the modem. ### Claim 11 (depends on 1) The method of claim 1, wherein transmitting the second signal is based on a determination of a type of the exception event. ### Claim 12 An apparatus for wireless communication, comprising: a transmitter configured to transmit a first signal at a first transmission power based on time-averaged radio frequency (RF) exposure measurements over a time window; a memory configured to store RF exposure information associated with the time window and store a timestamp associated with the RF exposure information; a modem configured to store the RF exposure information associated with the time window, the memory being distinct from the modem; and one or more processors coupled to the transmitter, to the memory, and to the modem, the one or more processors being configured to detect that an exception event associated with the apparatus occurred, wherein the transmitter is further configured to transmit a second signal at a second transmission power based at least in part on the RF exposure information stored in the memory in response to the detection of the exception event. ### Claim 13 (depends on 12) The apparatus of claim 12, wherein the timestamp corresponds to a time when the first signal was transmitted. ### Claim 14 (depends on 13) The apparatus of claim 13, wherein the RF exposure information comprises at least one of a history of transmission powers or the time-averaged RF exposure measurements. ### Claim 15 (depends on 12) The apparatus of claim 12, further comprising a counter coupled to the one or more processors and configured to provide the timestamp, wherein: the counter is resistant to the exception event; the one or more processors are further configured to obtain the timestamp from the counter; and the transmitter is further configured to transmit the second signal at the second transmission power based at least in part on the RF exposure information stored in the memory in response to a determination that the timestamp associated with the RF exposure information is within a current time window. ### Claim 16 (depends on 12) The apparatus of claim 12, wherein the exception event results in unknown RF exposure for a time period. ### Claim 17 (depends on 12) The apparatus of claim 12, wherein the apparatus ceases communication during the exception event. ### Claim 18 (depends on 17) The apparatus of claim 17, wherein a particular level of RF exposure is associated with the exception event. ### Claim 19 (depends on 12) The apparatus of claim 12, wherein the memory is resistant to corruption from the exception event and wherein the modem is not resistant to corruption. ### Claim 20 (depends on 12) The apparatus of claim 12, wherein the transmitter is further configured to transmit the second signal at the second transmission power based on supplementing the time-averaged RF exposure measurements with the RF exposure information stored in the memory. ### Claim 21 (depends on 12) The apparatus of claim 12, wherein the exception event includes at least one of an error, a reset, a crash, or a reboot affecting an operation of the apparatus or the modem. ### Claim 22 (depends on 12) The apparatus of claim 12, wherein the transmitter is further configured to transmit the second signal based on a determination of a type of the exception event. ### Claim 23 A non-transitory computer-readable medium comprising instructions that, when executed by one or more processors of an apparatus, cause the apparatus to perform operations for wireless communication, the operations comprising: transmitting a first signal at a first transmission power based on time-averaged RF exposure measurements over a time window; storing RF exposure information associated with the time window in a memory of the apparatus and in a modem and storing a timestamp associated with the RF exposure information in the memory, the memory being distinct from the modem; detecting that an exception event associated with the apparatus occurred; and transmitting a second signal at a second transmission power based at least in part on the RF exposure information stored in the memory in response to the detection of the exception event. ### Claim 24 (depends on 23) The non-transitory computer-readable medium of claim 23, wherein the timestamp corresponds to a time when the first signal was transmitted. ### Claim 25 (depends on 24) The non-transitory computer-readable medium of claim 24, wherein the RF exposure information comprises at least one of a history of transmission powers or the time-averaged RF exposure measurements. ### Claim 26 (depends on 23) The non-transitory computer-readable medium of claim 23, wherein the memory is resistant to corruption from the exception event and wherein the modem is not resistant to corruption. ### Claim 27 (depends on 23) The non-transitory computer-readable medium of claim 23, wherein the transmitting the first signal is based at least in part on the RF exposure information stored in the modem.