Proximal user detection with measurement receiver
First Claim
1. A method comprising:
- detecting, by an on-device measurement receiver of a communication device, a first signal level corresponding to power delivered to a first antenna;
determining a first return loss value based on a first transmit power setting and the first signal level;
determining whether the first return loss value differs from a baseline value by a first threshold amount;
in response to determining that the first return loss value differs by the first threshold amount, reducing the power delivered to the first antenna by detuning an antenna matching circuit that variably delivers power to the first antenna;
determining whether the first return loss value differs from the baseline value by a second threshold amount that is greater than the first threshold amount; and
in response to determining that the first return loss value differs by the second threshold amount, reducing an output power level of a transceiver of the communication device that delivers power to the first antenna.
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Accused Products
Abstract
A method, communication device, and computer program product mitigate Specific Absorption Rating (SAR) exposure to a user proximate to a communication device. The method includes an on-device measurement receiver of a communication device detecting a first signal level corresponding to power delivered to a first antenna. The method includes a controller determining a first return loss value based on a first transmit power setting and the first signal level. The method includes the controller determining whether the first return loss value differs from a baseline value by a threshold amount. In response to the controller determining that the first return loss value differs by the threshold amount, the controller causes the communication device to reduce the power delivered to the first antenna.
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Citations
14 Claims
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1. A method comprising:
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detecting, by an on-device measurement receiver of a communication device, a first signal level corresponding to power delivered to a first antenna; determining a first return loss value based on a first transmit power setting and the first signal level; determining whether the first return loss value differs from a baseline value by a first threshold amount; in response to determining that the first return loss value differs by the first threshold amount, reducing the power delivered to the first antenna by detuning an antenna matching circuit that variably delivers power to the first antenna; determining whether the first return loss value differs from the baseline value by a second threshold amount that is greater than the first threshold amount; and in response to determining that the first return loss value differs by the second threshold amount, reducing an output power level of a transceiver of the communication device that delivers power to the first antenna. - View Dependent Claims (2, 3)
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4. A communication device comprising:
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a first antenna; a transceiver in communication with the first antenna and which delivers power to at least the first antenna via an antenna matching circuit that variably delivers the power to the first antenna; an on-device measurement receiver that detects a first signal level that corresponds to the power delivered to a first antenna; a controller in communication with the transceiver and the on-device measurement receiver, wherein; the controller compares a first transmit power setting to the first signal level to determine a first return loss value; the controller determines whether the first return loss value differs from a baseline value by a first threshold amount that indicates an exceedance of a Specific Absorption Rate (SAR); in response to the controller determining that the first return loss value differs by the first threshold amount, the controller;
reduces the power delivered to the first antenna by the transceiver by detuning an antenna matching circuit;the controller determines whether the first return loss value differs from the baseline value by a second threshold amount that is greater than the first threshold amount; and in response to determining that the first return loss value differs by the second threshold amount, the controller reduces an output power level of the transceiver of the communication device that delivers power to the first antenna. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11)
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12. A program product comprising:
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a controller-readable storage device having stored thereon program code that, when executed, configures by a controller of a communication device having at least first antenna and the controller communicatively connected with a transceiver that provides power to the first antenna and with an on-device measurement receiver, the program code configures the controller to perform executable operations comprising; receiving from the on-device measurement receiver, a first signal level that is detected by the on-device measurement receiver and which corresponds to power delivered to a first antenna; comparing a first transmit power setting to the first signal level to determine a first return loss value; determining whether the first return loss value differs from a baseline value by a first threshold amount that indicates an exceedance of a Specific Absorption Rate (SAR); and in response to determining that the first return loss value differs by the first threshold amount, reducing the power delivered to the first antenna by detuning an antenna matching circuit that variably delivers power to the first antenna; determining whether the first return loss value differs from the baseline value by a second threshold amount that is greater than the first threshold amount; and in response to determining that the first return loss value differs by the second threshold amount, triggering a reduction in an output power level of the transceiver of the communication device that delivers power to the first antenna. - View Dependent Claims (13, 14)
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Specification