Transmit power management for specific absorption rates
First Claim
1. A mobile device, comprising:
- a transmitter configured to operate at a transmit power controlled by a transmit power limit;
a proximity sensor configured to determine when the mobile device is in close proximity to a user of the mobile device;
a processor; and
a transmit power regulator configured to;
calculate a cumulative energy amount transmitted by the transmitter over a specified number of frames;
determine whether the cumulative energy amount exceeds an energy limit;
for each frame, in a series of frames, calculate a reduced transmit power limit when the cumulative energy amount exceeds the energy limit, wherein the reduced transmit power limit for each frame in the series of frames is based on a damping factor that gradually reduces the cumulative energy amount when the proximity sensor determines that the mobile device is in close proximity to the user of the mobile device.
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Accused Products
Abstract
Systems and methods for regulating transmit power in a mobile station to comply with SAR limits are disclosed. A mobile station may include a processor, transmitter, and proximity sensor. The transmitter is configured to operate at a transmit power controlled by a first transmit power limit. The proximity sensor identifies how close the mobile station is to a human head. A transmit power regulator, implemented on the processor, determines the cumulative energy radiated by the transmitter over a specified number of frames. If the cumulative energy exceeds an energy limit based on a SAR limit, and the proximity sensor indicates that the mobile station is close to a human head, the transmit power regulator may decrease the transmit power limit of the transmitter.
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Citations
20 Claims
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1. A mobile device, comprising:
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a transmitter configured to operate at a transmit power controlled by a transmit power limit; a proximity sensor configured to determine when the mobile device is in close proximity to a user of the mobile device; a processor; and a transmit power regulator configured to; calculate a cumulative energy amount transmitted by the transmitter over a specified number of frames; determine whether the cumulative energy amount exceeds an energy limit; for each frame, in a series of frames, calculate a reduced transmit power limit when the cumulative energy amount exceeds the energy limit, wherein the reduced transmit power limit for each frame in the series of frames is based on a damping factor that gradually reduces the cumulative energy amount when the proximity sensor determines that the mobile device is in close proximity to the user of the mobile device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method, comprising:
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calculating a cumulative energy amount transmitted by a transmitter in a mobile station over a specified number of frames, wherein the transmitter operates at a transmit power controlled by a transmit power limit; determining whether the cumulative energy amount exceeds an energy limit; and determining if the mobile station is in close proximity to a user of the mobile device; calculating for each frame, in a series of frames, a reduced transmit power limit, when the cumulative energy amount exceeds the energy limit, wherein the reduced transmit power limit for each frame in the series of frames is based on a damning factor that gradually reduces the cumulative energy amount when the mobile station is in close proximity to the user of the mobile device and when the cumulative energy amount exceeds the energy limit. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification