Transmission Antenna Switching for SAR-Limited Multi-Radio Devices
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Solution Overview
Problem
Existing user equipment (UE) devices face challenges in managing electromagnetic radiation exposure, particularly in ensuring compliance with Specific Absorption Rate (SAR) regulations when transmitting multiple signals for cellular, Bluetooth, and Wi-Fi communications, leading to potential power backoff and reduced performance.
Innovation Solution
The UE employs multiple antennas and processors to manage RF signals for cellular and non-cellular communications, dynamically reallocating signals based on SAR cumulative values to maintain compliance with regulatory limits, thereby optimizing transmission power and reducing backoff events.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the UE transmits multiple RF signals simultaneously for cellular, Bluetooth, and Wi-Fi communications, then communication functionality and data transmission capability are improved, but the SAR cumulative value increases and may exceed regulatory limits
Solution Approach 1:
The patent segments the antenna system into multiple antenna groups (first antenna group and second antenna group) that can be independently controlled. By dividing the antenna resources and assigning different RF signals to different groups, the system can manage SAR exposure more effectively while maintaining multiple communication functions simultaneously.
Solution Approach 2:
The patent implements dynamic antenna group switching based on SAR cumulative value monitoring. When the SAR threshold is approached, the system dynamically reallocates RF signals between antenna groups, changing the transmission configuration in real-time to comply with regulatory limits while minimizing impact on communication performance.
2Object-affected harmful factors
If the UE backs off transmission power to comply with SAR limits, then SAR compliance is improved, but transmission power and communication performance deteriorate
Solution Approach 1:
Instead of static power backoff, the patent dynamically switches between different antenna groups based on real-time SAR monitoring. This allows the system to maintain higher transmission powers by redistributing RF signals across available antenna resources, complying with SAR limits without significant performance degradation.
Solution Approach 2:
The patent changes the transmission configuration parameters by switching antenna group assignments. When SAR limits are approached, the system modifies which antennas are used for which RF signals, effectively changing the transmission parameters to reduce SAR exposure while maintaining communication quality.
3Object-affected harmful factors
If the UE implements SAR monitoring and antenna switching, then SAR compliance and communication performance are improved, but device complexity increases
Solution Approach 1:
The patent designs the antenna groups to serve multiple functions - they can be dynamically assigned to different RF signals (cellular, Bluetooth, Wi-Fi) based on communication needs and SAR conditions. This multi-functional design allows a single antenna group structure to handle various communication scenarios without requiring separate dedicated antennas for each function.
Solution Approach 2:
The patent implements a feedback mechanism where the SAR cumulative value is continuously monitored and used to control antenna group switching decisions. This closed-loop control automates the complexity of SAR management, reducing the need for manual intervention while ensuring compliance with regulatory limits.
Data Source
AI summary
An electronic device may include at least one communication processor and at least one short-range communication module. A first RF signal for cellular communication can be controlled to be provided to a first antenna. The at least one short-range communication module can be configured to control that a second RF signal for non-cellular communication is provided to a second antenna included in a first antenna group including the first antenna. The at least one communication processor can be configured such that it is determined, on the basis of a confirmation that a SAR accumulation value corresponding to the first antenna group satisfies a designated condition, that a third RF signal for non-cellular communication is provided to a third antenna included in a second antenna group differing from the first antenna group. The at least one communication processor can be configured to provide, to the at least one short-range communication module, a control signal that causes the third RF signal for the non-cellular communication to be provided to the third antenna. The short-range communication module can be configured to control, on the basis the reception of the control signal, that the third RF signal for the non-cellular communication is provided to the third antenna. Other embodiments are possible.