Service-Scenario Transmit Power Limits for SAR-Compliant Devices
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Solution Overview
Problem
Existing electronic devices face issues with uplink signal deterioration and dropped calls due to excessive power transmission, which violates specific absorption rate (SAR) regulations, particularly in real-time services.
Innovation Solution
The method involves determining service scenarios to adjust transmit power limits dynamically, using upper and lower limits based on signal strength and service type to maintain average power compliance with SAR requirements, thereby optimizing power usage and reducing duty ratio in non-real-time and real-time services.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the electronic device transmits with full power Pmax to ensure sufficient transmission distance and signal quality, then the transmission power is improved, but the SAR compliance is worsened and harmful effects increase
Solution Approach 1:
The patent implements periodic action by dividing the time window into multiple segments and alternating between high power transmission (Pmax) and reduced power transmission (Plimit-margin). The device transmits at full power for a first duration and then at reduced power for a second duration, creating a periodic power adjustment pattern that maintains average SAR compliance while allowing sufficient high-power transmission periods for adequate signal quality.
Solution Approach 2:
The patent applies dynamics by making the transmission power adjustable rather than fixed. The system dynamically switches between two power levels (Pmax and Plimit-margin) based on the time window requirements and SAR compliance needs. This dynamic power adjustment allows the device to optimize between transmission quality and SAR compliance in real-time.
2Object-affected harmful factors
If the electronic device reduces transmission power to comply with SAR regulations, then the SAR compliance is improved, but the signal quality deteriorates and uplink performance worsens
Solution Approach 1:
The patent uses periodic action to alternate between high-power and reduced-power transmission phases. By transmitting at Pmax during the first duration and at Plimit-margin during the second duration, the system ensures that signal quality is maintained during high-power phases while SAR compliance is achieved through the periodic reduction in power, balancing both requirements.
Solution Approach 2:
The patent applies parameter changes by adjusting the transmission power level as a variable parameter. The system changes the power parameter between two distinct values (Pmax and Plimit-margin) based on the time window and SAR requirements. This parameter adjustment allows the system to optimize the balance between signal quality and SAR compliance by controlling the duration and frequency of power level changes.
3Reliability
If the electronic device transmits continuously at high power to maintain signal quality, then the signal quality is improved, but the duty ratio increases and energy consumption worsens
Solution Approach 1:
The patent implements periodic action by introducing duty cycles that alternate between high-power and reduced-power transmission. The device transmits at full power for a first duration and then at reduced power for a second duration, creating a periodic pattern that reduces overall energy consumption while maintaining signal quality during critical transmission periods. This periodic duty cycle approach directly addresses energy consumption concerns.
4Device complexity
If the electronic device uses fixed power limits to simplify control, then the device complexity is reduced, but the adaptability to different service scenarios worsens
Solution Approach 1:
The patent applies dynamics by making the power limits adjustable based on service scenario. The system determines whether to use Plimit or Plimit-margin as the power limit based on the detected service type (real-time vs. non-real-time). This dynamic adaptation to different scenarios maintains relatively simple control logic while significantly improving adaptability to various service requirements.
Solution Approach 2:
The patent uses parameter changes by adjusting the power limit parameter based on service scenario detection. The system changes the power limit parameter between Plimit and Plimit-margin depending on whether the service is real-time or non-real-time. This parameter adjustment approach maintains simple control structure while achieving scenario-specific optimization.
Data Source
AI summary
A method for controlling an electronic device includes obtaining a service scenario of the electronic device; determining an upper limit value and/or a lower limit value of a transmit power based on the service scenario; controlling the electronic device to transmit and receive signals by using the transmit power, and making an average value of the transmit power satisfy an SAR requirement.