Electronic Device SAR Margin Allocation for Cellular–WiFi Power Control
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Solution Overview
Problem
Electronic devices supporting both cellular and WiFi communication face challenges in managing Specific Absorption Rate (SAR) margins to comply with regulations when the antennas for both types of communication are close to each other, leading to potential inefficiencies and unnecessary power backoffs.
Innovation Solution
The electronic device dynamically adjusts SAR margins based on the state of the WiFi module, assigning different amounts to cellular and WiFi communications depending on the cumulative SAR values consumed, ensuring compliance with regulations and optimizing power usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If SAR margin is assigned to both cellular and WiFi communications simultaneously, then both communications can operate, but transmission power is reduced due to power backoff
Solution Approach 1:
The patent implements dynamic SAR margin allocation that adjusts the SAR margin for WiFi communication based on its operational state. When WiFi is in idle state, a first SAR margin is allocated; when WiFi is in active state, a second (larger) SAR margin is allocated. This dynamic adjustment allows the system to maintain both cellular and WiFi communications while optimizing transmission power by allocating SAR margins according to actual communication needs rather than using fixed conservative allocations.
2Reliability
If SAR margin is conservatively allocated to ensure compliance, then SAR regulations are satisfied, but device performance is reduced due to unnecessary power backoffs
Solution Approach 1:
The patent changes the SAR margin parameter dynamically based on WiFi communication state. Instead of using a fixed conservative SAR margin allocation, the system adjusts the SAR margin value according to whether WiFi is in idle or active state. This parameter change enables the system to maintain SAR compliance while avoiding unnecessary power backoffs, thereby improving device performance without sacrificing regulatory compliance.
Solution Approach 2:
The patent implements a feedback mechanism that monitors WiFi communication state (idle or active) and uses this information to adjust SAR margin allocation. The system continuously monitors the operational state of WiFi and adjusts the SAR margin accordingly, creating a closed-loop control system that optimizes power transmission while ensuring SAR compliance based on actual communication conditions.
3Device complexity
If fixed SAR margin allocation is used, then implementation is simple, but transmission power efficiency is reduced due to unnecessary backoffs
Solution Approach 1:
The patent introduces dynamic SAR margin allocation that adapts to WiFi communication state, moving from fixed to variable SAR margin assignments. This dynamic approach increases implementation complexity slightly but significantly improves transmission power efficiency by avoiding unnecessary power backoffs when WiFi is in idle state while maintaining compliance when WiFi is active.
Data Source
AI summary
A method and an electronic device are provided, The electronic device includes a wireless fidelity (WiFi) module for WiFi communication, memory storing one or more computer programs, and at least one communication processor, for at least one cellular communication, communicatively coupled to the WiFi module and the memory, wherein the one or more computer programs include computer-executable instructions that, when executed by the at least one communication processor individually or collectively, cause the electronic device to, based on identifying that WiFi module is in an OFF state, assign an overall specific absorption rate (SAR) margin assigned to the electronic device for a first period to the at least one cellular communication, based on identifying that the WiFi module is in an ON state and a cumulative SAR value consumed by the WiFi module is less than or equal to a threshold value, assign a first amount of the SAR margin assigned for the first period to the WiFi communication and assign a remaining amount excluding the first amount to the at least one cellular communication, and based on identifying that the WiFi module is in an ON state and the cumulative SAR value consumed by the WiFi module exceeds the threshold value, assign a second amount of the SAR margin assigned for the first period to the WiFi communication, which is greater than the first amount, and assign a remaining amount excluding the second amount to the at least one cellular communication.