Wireless Beam Power Limits for Sensor Coverage Blind Spots
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Solution Overview
Problem
Wireless communication devices face challenges in ensuring compliance with radio frequency (RF) exposure limits due to the potential overexposure of human tissue in blind spots of proximity sensors, which current methods fail to adequately account for.
Innovation Solution
Determine a transmit power limit by considering the RF exposure levels within and outside the sensor coverage zone, applying a minimum constraint based on the maximum distance and array gain to ensure compliance with RF exposure limits, thereby accounting for blind spots.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If transmit power is increased to improve uplink communication performance, then communication quality improves, but RF exposure of human tissue increases and may exceed safety limits
Solution Approach 1:
The patent applies local quality by determining different transmit power limits for different spatial regions. Specifically, it calculates a first transmit power limit for directions within sensor coverage and a second transmit power limit for directions outside sensor coverage (blind spots), allowing the system to optimize communication performance in safe regions while preventing harmful RF exposure in vulnerable regions.
Solution Approach 2:
The patent implements dynamics by making the transmit power limit adaptive rather than static. The system dynamically adjusts the transmit power limit based on real-time sensor coverage information and beam directions, selecting different power limits (first or second) depending on whether the current beam falls within or outside the sensor coverage zone, thereby optimizing performance while ensuring safety.
2Reliability
If sensor coverage is expanded to reduce blind spots, then RF exposure safety improves, but device complexity and cost increase
Solution Approach 1:
The patent applies segmentation by dividing the spatial environment into distinct regions based on sensor coverage: a first region within sensor coverage where higher transmit power is permitted, and a second region outside sensor coverage (blind spots) where lower transmit power is required. This segmentation allows the existing sensor system to be used effectively without expansion, maintaining safety compliance through intelligent power control rather than physical sensor expansion.
3Reliability
If transmit power limit is reduced to ensure RF exposure compliance, then safety is improved, but uplink communication performance deteriorates
Solution Approach 1:
The patent resolves this contradiction by applying different transmit power limits to different spatial regions. In regions within sensor coverage where safety is confirmed, the system uses a first (higher) transmit power limit to maintain good communication performance. In regions outside sensor coverage where safety cannot be confirmed, the system uses a second (lower) transmit power limit to ensure safety compliance. This spatially differentiated approach prevents unnecessary performance degradation while ensuring safety.
Data Source
AI summary
Techniques and apparatus for determining a transmit power limit based on sensor spatial coverage. A method that may be performed by a wireless communication device includes selecting a beam for transmission of a signal, determining a transmit power limit based at least in part on an overlap between the selected beam and a coverage zone of a sensor, and transmitting the signal via the beam at a transmit power based at least in part on the determined transmit power limit.