MOBILE RADIO TERMINAL
An attitude detector installed in a cabinet detects the current attitude of the cabinet. Control circuitry suppresses radiated output power of a wireless transceiver in accordance with the current attitude of the cabinet, which is detected by the attitude detection unit. The attitude detection unit obtains two angles φ and θ based on x-axis, y-axis, and z-axis outputs of a three-axis acceleration sensor, for example. The control circuitry determines the necessity or lack thereof of the suppression of the radiated output power in accordance with a combination of the angle values.
1 . A mobile radio terminal comprising:
a cabinet;
an attitude detector that is installed in the cabinet and detects a current attitude of the cabinet;
a wireless transceiver that includes a transmitter and a receiver that respectively transmit and receive radio frequency signals via an antenna; and
a control circuitry that suppresses radiated output power of the transmitter in accordance with a current attitude of the cabinet detected by the attitude detector.
2 . The mobile radio terminal according to claim 1 , wherein the attitude detector includes a three-axis acceleration sensor, and the current attitude is detected based on an output of the three-axis acceleration sensor.
3 . The mobile radio terminal according to claim 2 , wherein the attitude detector obtains two angles φ and θ based on x-axis, y-axis, and z-axis outputs of the three-axis acceleration sensor, and the control circuitry determines a necessity or a lack of necessity to suppress the radiated output power of the transmitter in accordance with a combination of angle values of angles φ and θ.
4 . The mobile radio terminal according to claim 1 , wherein the control circuitry determines whether or not to suppress the radiated output power of the transmitter based on whether or not the current attitude of the cabinet, as detected by the attitude detector, matches a predetermined attitude condition.
5 . The mobile radio terminal according to claim 1 , wherein the control circuitry determines whether or not to suppress the radiated output power of the transmitter based on a mobile country code received by the receiver from a radio base station.
6 . The mobile radio terminal according to claim 1 , wherein the mobile radio terminal is battery operated, and
the control circuitry determines a maximum value of the radiated output power based on whether the control circuitry determines whether there is a necessity or a lack of necessity to suppress the radiated output power of the transmitter and a current voltage value of the battery.
7 . The mobile radio terminal according to claim 6 , wherein the control circuitry further determines the maximum value of the radiated output power of the transmitter based on a communication scheme of the wireless transceiver.
8 . A method of reducing specific absorption rate (SAR) in a mobile radio terminal, the method comprising:
detecting a current attitude of a cabinet of the mobile radio terminal with an attitude detector installed in the cabinet;
transmitting radio frequency signals with a transmitter and an antenna and receiving radio frequency signals with a receiver and the antenna, and
controllably suppressing a radiated output power of the transmitter with a control circuitry in accordance with a current attitude of the cabinet as detected by the attitude detector.
9 . The method according to claim 8 , wherein the detecting includes detecting the current attitude of the cabinet with an output of a three-axis acceleration sensor.
10 . The method according to claim 9 , wherein the detecting further includes obtaining two angles φ and θ based on x-axis, y-axis, and z-axis outputs of the three-axis acceleration sensor, and
the controllably suppressing includes combining angle values of angles φ and θ and determining a necessity or a lack of necessity to suppress the radiated output power of the transmitter in accordance with a combined angle value.
11 . The method according to claim 8 , wherein
the controllably suppressing includes determining with the control circuitry whether or not to suppress the radiated output power of the transmitter based on whether or not the current attitude of the cabinet matches a predetermined attitude condition.
12 . The method according to claim 8 , further comprising:
receiving via the receiver a mobile country code from a radio base station, wherein
the controllably suppressing includes determining with the control circuitry whether or not to suppress the radiated output power of the transmitter based on the mobile country code received by the receiver.
13 . The method according to claim 8 , further comprising:
powering the mobile radio terminal with a battery; and
determining with the control circuitry a maximum value of the radiated output power based on whether the control circuitry determines whether there is a necessity or a lack of necessity to suppress the radiated output power of the transmitter and a current voltage value of the battery.
14 . The method according to claim 13 , further comprising
determining with the control circuitry the maximum value of the radiated output power of the transmitter based on a communication scheme of the mobile radio terminal.
15 . A non-transitory computer readable storage medium having computer readable instructions stored thereon that when executed by a processor perform a method of reducing specific absorption rate (SAR) in a mobile radio terminal, the method comprising:
detecting a current attitude of a cabinet of the mobile radio terminal with an attitude detector installed in the cabinet;
transmitting radio frequency signals with a transmitter and an antenna and receiving radio frequency signals with a receiver and the antenna, and
controllably suppressing a radiated output power of the transmitter with a control circuitry in accordance with a current attitude of the cabinet as detected by the attitude detector.
16 . The non-transitory computer readable medium according to claim 15 , wherein the detecting includes detecting the current attitude of the cabinet with an output of a three-axis acceleration sensor.
17 . The non-transitory computer readable medium according to claim 16 , wherein
the detecting further includes obtaining two angles φ and θ based on x-axis, y-axis, and z-axis outputs of the three-axis acceleration sensor, and
the controllably suppressing includes combining angle values of angles φ and θ and determining a necessity or a lack of necessity to suppress the radiated output power of the transmitter in accordance with a combined angle value.
18 . The non-transitory computer readable medium according to claim 15 , wherein
the controllably suppressing includes determining with the control circuitry whether or not to suppress the radiated output power of the transmitter based on whether or not the current attitude of the cabinet matches a predetermined attitude condition.
19 . The non-transitory computer readable medium according to claim 15 , wherein the method further comprising:
receiving via the receiver a mobile country code from a radio base station, wherein
the controllably suppressing includes determining with the control circuitry whether or not to suppress the radiated output power of the transmitter based on the mobile country code received by the receiver.
20 . The non-transitory computer readable medium according to claim 15 , wherein the method further comprising:
powering the mobile radio terminal with a battery; and
determining with the control circuitry a maximum value of the radiated output power based on whether the control circuitry determines whether there is a necessity or a lack of necessity to suppress the radiated output power of the transmitter and a current voltage value of the battery.