# US 10,484,951 B2 · Controlling antenna output power > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,484,951 B2 - Document ID: US10484951B2 - Status: Granted - Kind: B2 - Application number: 13/912,285 - Filed: 2013-06-07 - Published: 2013-12-12 - Granted: 2019-11-19 - Earliest claimed: 2012-06-08 - Assignees: Lenovo (Singapore) Pte. Ltd. - Applicants: Lenovo (Singapore) Pte. Ltd. - Inventors: Shigekazu Hawaka; Masaki Oie; Masahide Tamura - Web page: https://patentgrep.com/patent/US10484951B2 ## CPC - H04W 52/18: TPC being performed according to specific parameters - H04B 17/102: {Power radiated at antenna} - H04W 52/283: {Power depending on the position of the mobile} - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - H04B: TRANSMISSION ## Abstract An embodiment provides a information handling device, including: one or more processors; one or more antennas, a communication element, and a memory device that stores instructions executed by the one or more processors, the instructions being executable by the one or more processors to: recognize a location within which the information handling device is operating through wireless communication received via the communication element; and modulate, based on which location the information handling device is operating within, a dynamic power reduction of transmission power through the antenna. ## Claims ### Claim 1 An information handling device, comprising: one or more processors; one or more antennas; one or more proximity sensors disposed near the one or more antennas; a communication element; and a memory device that stores instructions executed by the one or more processors, the instructions being executable by the one or more processors to: recognize a geographic location within which the information handling device is operating through wireless communication received via the communication element, said wireless communication including a code identifying the geographic location; set a specific absorption rate (SAR) limit for the information handling device based on the code identifying the geographic location, wherein the SAR limit for the information handling device is modified for different geographic locations; enabling a dynamic power reduction function of the information handling device, wherein the enabling comprises determining a frequency band the information handling device is communicating on and enabling the dynamic power reduction function when the frequency band would result in a SAR above the SAR limit, wherein the dynamic power reduction function is not enabled when the frequency band would not result in a SAR above the SAR limit, wherein the enabling a dynamic power reduction function is based upon a coexistence flag identified in a table, wherein a set coexistence flag indicates a frequency band that the dynamic power reduction function should be enabled; identify, responsive to enabling the dynamic power reduction function, a power of electromagnetic energy transmitted by the one or more antennas with respect to a human body; and modulate, based on the SAR limit and the identified power of electromagnetic energy, the dynamic power reduction function to modulate transmission power through the one or more antennas, wherein to modulate comprises dynamically modifying the transmission power through the antenna as the distance between the human body and the one or more antennas changes to adjust the SAR of the information handling device for the frequency band. ### Claim 2 (depends on 1) The information handling device of claim 1, wherein the communication element comprises a wireless module operating at a frequency band for a wireless WAN. ### Claim 3 (depends on 2) The information handling device of claim 2, wherein the instructions being executed further comprise instruction to recognize the geographic location within which the information handling device is operating based on a frequency band used for communication with a wireless base station. ### Claim 4 (depends on 1) The information handling device of claim 1, wherein the communication element comprises a global positioning satellite (GPS) module, wherein to recognize a geographic location within which the information handling device is operating through wireless communication received via the communication element comprises recognizing the geographic location within which the information handling device is operating based on output from the GPS module. ### Claim 5 (depends on 1) The information handling device as in claim 1, wherein the information handling device is a tablet terminal device. ### Claim 6 (depends on 1) The information handling device as in claim 1, further comprising a reference table including, for each of a plurality of countries, information indicating the geographic location within which the information handling device is operating. ### Claim 7 (depends on 2) The information handling device of claim 2, wherein the instructions being executed further comprise instruction to recognize the geographic location within which the information handling device is operating based on information received from a wireless base station. ### Claim 8 (depends on 7) The information handling device of claim 7, wherein the information received from the wireless base station is a mobile country code (MCC). ### Claim 9 (depends on 1) The information handling device of claim 1, wherein a geographic region within a country has a different SAR value for different frequency bands within the geographic region. ### Claim 10 A method, comprising: recognizing, using communications received via a communication element of an information handling device, a geographic location within which the information handling device is operating, said wireless communication including a code identifying the geographic location; setting a specific absorption rate (SAR) limit for the information handling device based on the code identifying the geographic location, wherein the SAR limit for the information handling device is modified for different geographic locations; enabling a dynamic power reduction function of the information handling device, wherein the enabling comprises determining a frequency band the information handling device is communicating on and enabling the dynamic power reduction function when the frequency band would result in a SAR above the SAR limit, wherein the dynamic power reduction function is not enabled when the frequency band would not result in a SAR above the SAR limit, wherein the enabling a dynamic power reduction function is based upon a coexistence flag identified in a table, wherein a set coexistence flag indicates a frequency band that the dynamic power reduction function should be enabled; identifying, responsive to enabling the dynamic power reduction function, a power of electromagnetic energy transmitted by the one or more antennas with respect to a human body; and modulating, based on the SAR limit and the identified power of electromagnetic energy, the dynamic power reduction function to modulate transmission power through the one or more antennas, wherein to modulate comprises dynamically modifying the transmission power through the antenna as the distance between the human body and the one or more antennas changes to adjust the SAR of the information handling device for the frequency band. ### Claim 11 (depends on 10) The method of claim 10, wherein the communication element comprises a wireless module operating at a frequency band for a wireless WAN. ### Claim 12 (depends on 11) The method of claim 11, wherein the recognizing a location further comprises recognizing the geographic location within which the information handling device is operating based on information received from a wireless base station. ### Claim 13 (depends on 11) The method of claim 11, wherein the recognizing a location further comprises recognizing the geographic location within which the information handling device is operating based a frequency band used for communication with a wireless base station. ### Claim 14 (depends on 10) The method of claim 10, wherein the communication element comprises a global positioning satellite (GPS) module, wherein to recognize a geographic location within which the information handling device is operating through wireless communication received via the communication element comprises recognizing the geographic location within which the information handling device is operating based on output from the GPS module. ### Claim 15 (depends on 10) The method of claim 10, wherein the information handling device is a tablet terminal device. ### Claim 16 (depends on 10) The method of claim 10, wherein the recognizing a location further comprises using a reference table including, for each of a plurality of countries, information indicating the geographic location within which the information handling device is operating. ### Claim 17 (depends on 12) The method of claim 12, wherein the information received from the wireless base station is a mobile country code (MCC). ### Claim 18 A computer program product comprising: a computer readable storage device having computer readable program code embodied therewith, the computer readable program code being executable by a processor and comprising: computer readable program code that recognizes a geographic location within which the information handling device is operating through wireless communication received via the communication element, said wireless communication including a code identifying the geographic location; computer readable program code that sets a specific absorption rate (SAR) limit for the information handling device based on the code identifying the geographic location, wherein the SAR limit for the information handling device is modified for different geographic locations; computer readable program code that enables a dynamic power reduction function of the information handling device, wherein the enabling comprises determining a frequency band the information handling device is communicating on and enabling the dynamic power reduction function when the frequency band would result in a SAR above the SAR limit, wherein the dynamic power reduction function is not enabled when the frequency band would not result in a SAR above the SAR limit, wherein the computer readable program code that enables a dynamic power reduction function is based upon a coexistence flag identified in a table, wherein a set coexistence flag indicates a frequency band that the dynamic power reduction function should be enabled; computer readable program code that identifies, responsive to enabling the dynamic power reduction function, a power of electromagnetic energy transmitted by the one or more antennas with respect to a human body; and computer readable program code that responsive to the determination, modulates, based on the SAR limit and the identified power of electromagnetic energy, the dynamic power reduction function to modulate transmission power through the one or more antennas, wherein to modulate comprises dynamically modifying the transmission power through the antenna as the distance between the human body and the one or more antennas changes to adjust the SAR of the information handling device for the frequency band.