# US 12,184,321 B2 · Method and apparatus for controlling radio frequency exposure of wireless device, and wireless device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,184,321 B2 - Document ID: US12184321B2 - Status: Granted - Kind: B2 - Application number: 17/639,420 - Filed: 2020-09-02 - Published: 2022-09-22 - Granted: 2024-12-31 - Earliest claimed: 2019-09-02 - Assignees: Huawei Technologies Co., Ltd. - Applicants: Huawei Technologies Co., Ltd. - Inventors: Yiling Chen; Wei Liu; Weitao Jing; Yi Sui; Zhijun Chen - Web page: https://patentgrep.com/patent/US12184321B2 ## CPC - H04B 1/3838: {Arrangements for reducing RF exposure to the user, e.g. by changing the shape of the transceiver while in use} - H04W 52/225: {Calculation of statistics, e.g. average or variance} - H04W 52/36: with a discrete range or set of values, e.g. step size, ramping or offsets - H04W 52/367: {Power values between minimum and maximum limits, e.g. dynamic range} - Y02D 30/70: in wireless communication networks - H04B: TRANSMISSION - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - Y02D: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE ## Abstract A method includes obtaining an average radio frequency exposure value over a target time window, where the target time window is a standard time window, determining a power threshold corresponding to the average radio frequency exposure value, where the power threshold is a preset power value corresponding to a preset value range to which the average radio frequency exposure value belongs, and controlling a transmit power of the wireless device based on the power threshold over a controlled time window. ## Claims ### Claim 1 A method for controlling radio frequency exposure of a wireless device, wherein the method comprises: obtaining an average radio frequency exposure value over a target time window corresponding to a controlled time window, wherein the target time window is a standard time window, wherein a start moment of the controlled time window is an end moment of the target time window, and wherein duration of the controlled time window is shorter than duration of the standard time window; storing a preset correspondence between a preset value range of the average radio frequency exposure value and a preset power based on an application scenario; and controlling a transmit power of the wireless device based on a power threshold over the controlled time window such that the average radio frequency exposure value of the wireless device in any standard time window is less than or equal to a standard radio frequency exposure value, wherein the power threshold is based on the stored preset correspondence. ### Claim 2 (depends on 1) The method of claim 1, wherein the power threshold is a transmit power threshold, and wherein controlling the transmit power comprises adjusting an actual transmit power of the wireless device over the controlled time window such that the actual transmit power is less than or equal to the transmit power threshold. ### Claim 3 (depends on 1) The method of claim 1, wherein the power threshold is a power back-off amount threshold, wherein controlling the transmit power comprises controlling, over the controlled time window, a transmit power back-off of the wireless device based on a target power back-off amount, and wherein the target power back-off amount is greater than or equal to the power back-off amount threshold. ### Claim 4 (depends on 1) The method of claim 1, wherein obtaining the average radio frequency exposure value over the target time window comprises: obtaining one or more first real-time transmit powers of the wireless device in a preset period over the target time window; generating a first addition value by adding all the first real-time radio frequency exposure values corresponding to the first real-time transmit powers; and generating the average radio frequency exposure value comprising a ratio of the first addition value to a first quantity of the first real-time transmit powers. ### Claim 5 (depends on 1) The method of claim 1, wherein obtaining the average radio frequency exposure value over the target time window comprises: dividing the target time window into at least two time sub-windows; obtaining one or more second real-time transmit powers of the wireless device in each of the time sub-windows; generating a second addition value by adding all the second real-time radio frequency exposure values corresponding to the second real-time transmit powers; and generating the average radio frequency exposure value comprising a ratio of the second addition value to a second quantity of the at least two time sub-windows. ### Claim 6 (depends on 1) The method of claim 1, wherein obtaining the average radio frequency exposure value over the target time window comprises: dividing the target time window into at least two time sub-windows; obtaining a sub-window average radio frequency exposure value over each of the time sub-windows; generating a third addition value by adding all the sub-window average radio frequency exposure values; and generating the average radio frequency exposure value comprising a ratio of the third addition value to a second quantity of the at least two time sub-windows. ### Claim 7 An apparatus for controlling radio frequency exposure of a wireless device, wherein the apparatus comprises: an obtaining system configured to obtain an average radio frequency exposure value over a target time window corresponding to a controlled time window, wherein the target time window is a standard time window, wherein a start moment of the controlled time window is an end moment of the target time window, and wherein duration of the controlled time window is shorter than duration of the standard time window; and a processor configured to: store a preset correspondence between a preset value range of the average radio frequency exposure value and a preset power based on an application scenario; and control a transmit power of the wireless device based on a power threshold over the controlled time window such that the average radio frequency exposure value of the wireless device in any standard time window is less than or equal to a standard radio frequency exposure value, wherein the power threshold is based on the stored preset correspondence. ### Claim 8 (depends on 7) The apparatus of claim 7, wherein the power threshold is a transmit power threshold, and wherein the processor is further configured to adjust an actual transmit power of the wireless device over the controlled time window such that the actual transmit power is less than or equal to the transmit power threshold. ### Claim 9 (depends on 7) The apparatus of claim 7, wherein the power threshold is a power back-off amount threshold, wherein the processor is further configured to control, over the controlled time window, a transmit power back-off of the wireless device based on a target power back-off amount, and wherein the target power back-off amount is greater than or equal to the power back-off amount threshold. ### Claim 10 (depends on 7) The apparatus of claim 7, wherein the obtaining system is further configured to: obtain one or more first real-time transmit powers in a preset period over the target time window; generate a first addition value by adding all the first real-time radio frequency exposure values corresponding to the first real-time transmit powers; and generate the average radio frequency exposure value comprising a ratio of the first addition value to a first quantity of the first real-time transmit powers. ### Claim 11 (depends on 7) The apparatus of claim 7, wherein the obtaining system is further configured to: divide the target time window into at least two time sub-windows; obtain a second real-time transmit power in each of the time sub-windows; generate a second addition value by adding all the second real-time radio frequency exposure values corresponding to the second real-time transmit powers; and generate the average radio frequency exposure value comprising a ratio of the second addition value to a second quantity of the at least two time sub-windows. ### Claim 12 (depends on 7) The apparatus of claim 7, wherein the obtaining system is further configured to: divide the target time window into at least two time sub-windows; obtain a sub-window average radio frequency exposure value over each of the time sub-windows; generate a third addition value by adding all the sub-window average radio frequency exposure values; and generate the average radio frequency exposure value comprising a ratio of the third addition value to a second quantity of the at least time sub-windows. ### Claim 13 A wireless device comprising: an apparatus for controlling radio frequency exposure of the wireless device, wherein the apparatus is configured to: obtain an average radio frequency exposure value over a target time window corresponding to a controlled time window, wherein the target time window is a standard time window, wherein a start moment of the controlled time window is an end moment of the target time window, and wherein duration of the controlled time window is shorter than duration of the standard time window; store a preset correspondence between a preset value range of the average radio frequency exposure value and a preset power based on an application scenario ; and control a transmit power of the wireless device based on a power threshold over the controlled time window such that the average radio frequency exposure value of the wireless device in any standard time window is less than or equal to a standard radio frequency exposure value, wherein the power threshold is based on the stored preset correspondence. ### Claim 14 (depends on 13) The wireless device of claim 13, wherein the power threshold is a transmit power threshold. ### Claim 15 (depends on 14) The wireless device of claim 14, wherein the apparatus is further configured to adjust an actual transmit power of the wireless device over the controlled time window such that the actual transmit power is less than or equal to the transmit power threshold. ### Claim 16 (depends on 13) The wireless device of claim 13, wherein the power threshold is a power back-off amount threshold. ### Claim 17 (depends on 16) The wireless device of claim 16, wherein the apparatus is further configured to control, over the controlled time window, a transmit power back-off of the wireless device based on a target power back-off amount, and wherein the target power back-off amount is greater than or equal to the power back-off amount threshold. ### Claim 18 (depends on 13) The wireless device of claim 13, wherein the apparatus is further configured to: obtain one or more first real-time transmit powers of the wireless device in a preset period over the target time window; generate a first addition value by adding all the first real-time radio frequency exposure values corresponding to the first real-time transmit powers; and generate the average radio frequency exposure value comprising a ratio of the first addition value to a first quantity of the first real-time transmit powers. ### Claim 19 (depends on 13) The wireless device of claim 13, wherein the apparatus is further configured to: divide the target time window into at least two time sub-windows; obtain one or more second real-time transmit powers of the wireless device in each of the time sub-windows; generate a second addition value by adding all the second real-time radio frequency exposure values corresponding to the second real-time transmit powers; and generate the average radio frequency exposure value comprising a ratio of the second addition value to a second quantity of the at least two time sub-windows. ### Claim 20 (depends on 13) The wireless device of claim 13, wherein the apparatus is further configured to: divide the target time window into at least two time sub-windows; obtain a sub-window average radio frequency exposure value over each of the time sub-windows; generate a third addition value by adding all the sub-window average radio frequency exposure values; and generate the average radio frequency exposure value comprising a ratio of the third addition value to a second quantity of the at least two time sub-windows.