RF Body Proximity Sensing for SAR-Aware Wireless Transmission
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing radio communication devices face challenges in managing RF radiation exposure to comply with SAR limits, as traditional proximity sensors for body detection are costly, increase device size, and can be inaccurate, while body proximity sensing operations using RF signals degrade communication performance and consume power.
Innovation Solution
Implementing body proximity sensing operations based on RF signals to detect human presence, controlling these operations based on transmit power limitations and time-averaged SAR metrics to optimize SAR compliance without dedicated sensors, thereby reducing costs and improving communication efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If dedicated proximity sensors are used for body detection, then detection accuracy is improved, but device cost and size increase
Solution Approach 1:
The patent applies multi-functionality by enabling the RF transceiver to perform both wireless communication and body proximity sensing functions. The RF transceiver uses its existing RF signals for dual purposes: maintaining communication while detecting body proximity through changes in signal characteristics, thereby eliminating the need for dedicated proximity sensors and reducing device complexity
Solution Approach 2:
The system performs self-service by using its own RF communication signals to detect body proximity. The RF transceiver monitors changes in its transmitted or received signals that indicate the presence of a body, allowing the device to self-detect proximity without requiring external or dedicated sensing components
2Reliability
If body proximity sensing operations using RF signals are implemented, then SAR compliance is improved, but communication performance and power consumption are degraded
Solution Approach 1:
The patent implements periodic action by performing body proximity sensing at specific intervals rather than continuously. The RF transceiver conducts proximity detection at predetermined times or under specific conditions, allowing communication operations to proceed normally between sensing intervals, thus maintaining communication efficiency while ensuring SAR compliance
Solution Approach 2:
The system applies partial action by performing proximity sensing only when necessary for SAR compliance rather than continuously. The RF transceiver monitors signal characteristics and initiates proximity detection only when conditions suggest potential SAR issues, reducing the overall impact on communication performance while maintaining adequate safety monitoring
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances compliance with SAR limits by optimizing RF transmission power and reducing unnecessary body proximity sensing operations, minimizing performance degradation and power consumption, while maintaining communication quality.
Implementation Method 1
Body proximity sensing (BPS) operations may be used to detect the presence of objects within the vicinity of antennas, which may include monitoring for detection using RF signals
Implementation Method 2
monitoring one or more transmit power limitation parameters used to limit transmit power of radio communication signals to be transmitted by the RF transceiver
Data Source
AI summary
Methods and apparatus are provided to control a body proximity sensing operation. An apparatus for a wireless communication device, the apparatus may include an interface to a radio frequency (RF) transceiver, and processing circuitry configured to: monitor one or more transmit power limitation parameters used to limit transmit power of transmissions of RF communication signals, and cause, based on a first transmit power limit including a monitored transmit power limitation parameter and a second transmit power limit, the RF transceiver to perform a body proximity sensing operation.