Samsung patents phone tech that switches radio bands to save battery

1. An electronic device comprising: a sensor module; an antenna module; and a processor electrically connected to the sensor module and the antenna module, wherein the processor is configured to: identify a first frequency band, determine, based on an electric field value of a transmission signal in the first frequency band being weaker than a predetermined electric field value, that an optimization for an output of the transmission signal is necessary, determine whether a maximum output for the transmission signal in the first frequency band is limited, the determining comprising: identifying a spaced distance from the antenna module to a user measured by the sensor module, and determining whether the spaced distance is shorter than a first predetermined spaced distance in which a specific absorption rate of a transmission signal for transmission through the first frequency band is equal to a predetermined tolerance value, and responsive to the maximum output being limited in the first frequency band, determine whether another frequency band exists in which the maximum output for the transmission signal is allowed, thereby preventing a power backoff, the determining comprising: in case the spaced distance is shorter than the first predetermined spaced distance, determining whether a second frequency band, in which the spaced distance is equal to or greater than a second predetermined spaced distance in which a specific absorption rate of a transmission signal for transmission through the second frequency band is equal to the predetermined tolerance value, exists, wherein the antenna module is configured to change a frequency band, in which a transmission signal is to be output, from the first frequency band to the second frequency band.