Millimeter Wave Proximity Detection for SAR Backoff Control
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Solution Overview
Problem
Conventional electronic devices using infrared sensors for proximity detection often malfunction due to obstacles or foreign bodies on the transmission window, leading to inaccurate detection of user proximity and improper implementation of SAR backoff functions, which can degrade communication signal quality.
Innovation Solution
The use of millimeter waves to accurately detect user proximity by transmitting a signal, receiving a reflection, and adjusting the communication signal strength based on the detected distance, allowing for dynamic and precise application of SAR backoff functions across different communication schemes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an infrared sensor is used for proximity detection, then the device can detect user proximity, but the detection may malfunction due to obstacles or foreign bodies on the transmission window
Solution Approach 1:
The patent introduces millimeter wave signals as an intermediary detection method that can penetrate obstacles such as display screens and foreign bodies that block infrared light. The millimeter wave serves as a mediator that bypasses the limitations of optical-based proximity sensors, enabling reliable detection even when the transmission window is obstructed.
Solution Approach 2:
The patent replaces the optical-based infrared detection system with an electromagnetic wave-based millimeter wave detection system. This substitution allows the proximity detection function to work through materials that are opaque to infrared light, such as display screens and certain foreign bodies, thereby resolving the malfunction issue.
2Object-affected harmful factors
If SAR backoff function is applied collectively to all communication schemes, then SAR compliance is achieved, but communication signal quality is unnecessarily degraded
Solution Approach 1:
The patent segments the SAR backoff application by communication scheme type. Instead of applying a uniform backoff to all schemes, the system identifies and applies backoff only to specific schemes (e.g., cellular communication) that are actively using the device when held close to the user, while allowing other schemes (e.g., Wi-Fi, Bluetooth) to maintain their signal quality.
Solution Approach 2:
The patent applies different SAR backoff strategies to different communication schemes based on their local characteristics and usage scenarios. The system evaluates each communication scheme individually and applies backoff only where necessary to meet SAR requirements, preserving communication quality for schemes that do not require backoff.
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 the accuracy of user proximity detection and ensures that communication signal strength is adjusted accordingly to comply with SAR standards, maintaining communication quality and user safety.
Implementation Method 1
receive a first reflection signal of the first millimeter wave signal reflected by an object positioned around the electronic device
Data Source
AI summary
An electronic device using a millimeter wave, according to various embodiments, includes a communication circuit and at least one processor. The at least one processor can be configured to: control the communication circuit so that a first millimeter wave signal is output at a first strength; use the communication circuit so that the first millimeter wave signal receives a first reflection signal reflected by an object; confirm whether the object is positioned within a first distance from the electronic device; determine the strength of a second millimeter wave signal to be a second strength corresponding to a second distance between the electronic device and the object, the second distance being shorter than the first distance; and control the communication circuit so that the second millimeter wave signal is output at the determined second strength.