SAR control using capacitive sensor and transmission duty cycle control in a wireless device
First Claim
1. A wireless device for providing specific absorption rate (SAR) control comprising:
- a wireless transmitter;
a capacitance sensor; and
a processor coupled to the wireless transmitter and the capacitance sensor, wherein the processor is configured to;
receive a first capacitance measurement from the capacitance sensor;
estimate a relative proximity of a human body to the apparatus based on the first capacitance measurement;
determine a target transmission time for the wireless transmitter within a time period based on the estimate;
compare a channel quality metric to a threshold;
determine a power backoff factor;
transmit at a power level reduced from a maximum power level by the power backoff factor during the time period when the channel quality metric is greater than the threshold; and
switch off the wireless transmitter for a portion of the time period when a transmission time of the wireless transmitter during the time period exceeds the target transmission time and the channel quality metric is less than the threshold.
1 Assignment
0 Petitions
Accused Products
Abstract
A wireless device for providing specific absorption rate (SAR) control comprising a wireless transmitter, a capacitance sensor, and a processor coupled to the wireless transmitter and the capacitance sensor, wherein the processor is configured to receive a first capacitance measurement from the capacitance sensor, estimate a relative proximity of a human body to the apparatus based on the measurement, determine a target transmission time for the wireless transmitter within a time period based on the estimate, and switch off the wireless transmitter for a portion of the time period if a transmission time of the wireless transmitter during the time period exceeds the target transmission time.
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Citations
16 Claims
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1. A wireless device for providing specific absorption rate (SAR) control comprising:
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a wireless transmitter; a capacitance sensor; and a processor coupled to the wireless transmitter and the capacitance sensor, wherein the processor is configured to; receive a first capacitance measurement from the capacitance sensor; estimate a relative proximity of a human body to the apparatus based on the first capacitance measurement; determine a target transmission time for the wireless transmitter within a time period based on the estimate; compare a channel quality metric to a threshold; determine a power backoff factor; transmit at a power level reduced from a maximum power level by the power backoff factor during the time period when the channel quality metric is greater than the threshold; and switch off the wireless transmitter for a portion of the time period when a transmission time of the wireless transmitter during the time period exceeds the target transmission time and the channel quality metric is less than the threshold. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for providing specific absorption rate (SAR) control comprising:
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receiving a first capacitance measurement of a first capacitor from a capacitance sensor, wherein the capacitance sensor is coupled to a wireless device, and wherein the wireless device comprises a wireless transmitter; estimating a relative proximity of a human body to the wireless device based on the first capacitance measurement; determining a target transmission time for the wireless transmitter within a time period based on the estimate; comparing a channel quality metric to a threshold; determining a power backoff factor; transmitting at a power level reduced from a maximum power level by the power backoff factor during the time period when the channel quality metric is greater than the threshold; and switching off the wireless transmitter for a portion of the time period when a transmission time of the wireless transmitter during the time period exceeds the target transmission time and the channel quality metric is less than the threshold. - View Dependent Claims (8, 9, 10, 11)
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12. A wireless device comprising:
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a wireless transmitter; a capacitance sensor configured to measure a first capacitance value and a second capacitance value; and a processor coupled to the wireless transmitter and the capacitance sensor, wherein the processor is configured to; determine that a human body is proximately located near the wireless device; identify a first one of a plurality of proximity regions within which the human body is located based on the first capacitance value and the second capacitance value; monitor a transmission time of the wireless transmitter during a time period; compare a channel quality metric to a threshold; determine a power backoff factor; transmit at a power level reduced from a maximum power level by the power backoff factor during the time period when the channel quality metric is greater than the threshold; and prohibit transmission by the wireless transmitter during a portion of the time period when the transmission time exceeds a target transmission time and the channel quality metric is less than the threshold, wherein the transmission time exceeding the target transmission time does not satisfy one or more specific absorption rate (SAR) compliance criteria for humans located in the first proximity region. - View Dependent Claims (13, 14, 15, 16)
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Specification