Wireless SAR Limit Selection Based on App Usage and Device Position
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Solution Overview
Problem
Existing cellular wireless devices lack flexibility in selecting Specific Absorption Rate (SAR) limits for terrestrial cellular wireless transmission, as current methods restrict body-extremity SAR limits to non-terrestrial communication, failing to account for varying usage scenarios and applications.
Innovation Solution
A wireless device identifies its operational state based on active applications and their usage, such as video calls or emergency services, to select appropriate SAR limits, including head-adjacent, body-adjacent, or body-extremity-adjacent limits, allowing higher transmit power levels when used at body extremities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If body-extremity SAR limit is restricted to non-terrestrial communication only, then regulatory compliance is ensured, but flexibility in selecting SAR limits for terrestrial communication is reduced
Solution Approach 1:
The patent applies local quality by determining device positioning relative to the user's body (head, body, or body extremity) and selecting the corresponding SAR limit based on the identified location. This allows different SAR limits to be applied to different spatial contexts of the same device, enabling flexible selection while maintaining regulatory compliance for each specific usage scenario.
Solution Approach 2:
The patent implements dynamics by dynamically selecting the applicable SAR limit based on real-time device operational state and positioning information. The system continuously monitors application usage and device position, then adapts the SAR limit selection accordingly, transitioning between head-adjacent, body-adjacent, and body-extremity-adjacent limits as usage conditions change.
2Productivity
If SAR limit is fixed for terrestrial communication, then regulatory compliance is maintained, but data throughput and power efficiency are suboptimal
Solution Approach 1:
The patent applies self-service by enabling the wireless device to autonomously determine its own positioning relative to the user's body and automatically select the appropriate SAR limit without external intervention. The device monitors its own operational state, identifies usage scenarios, and configures the transmitter accordingly, eliminating the need for manual SAR limit selection or external control.
Solution Approach 2:
The patent implements feedback by continuously monitoring device operational state and application usage, then using this information to adjust SAR limit selection in real-time. The system establishes a feedback loop where transmission conditions are evaluated, SAR limits are adjusted accordingly, and this process repeats as usage conditions change, optimizing throughput dynamically.
3Use of energy by moving object
If higher transmit power is used for body-extremity SAR limit, then power efficiency improves, but risk of exceeding SAR limits increases if misidentified
Solution Approach 1:
The patent applies preliminary action by determining device positioning and selecting the appropriate SAR limit before initiating or adjusting transmit power levels. The system proactively identifies the usage scenario and configures the correct SAR limit in advance, ensuring that when higher power is used for body-extremity operations, the appropriate limit is already in place to prevent harmful exposure.
Data Source
AI summary
The described embodiments relate to wireless communications, including methods and apparatus to select a specific absorption rate (SAR) limit for cellular wireless transmission by a transmitter of a wireless device based at least in part on knowledge of one or more applications that can generate data for cellular wireless transmission. One or more processors of a wireless device can identify a device operational state that can include information regarding a manner in which the wireless device is being used that can influence selection of an applicable SAR limit for the transmitter of the wireless device.