Antenna Selection Mechanism for SAR-Constrained Mobile Devices
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Wireless devices face challenges in managing transmit power to minimize user exposure to radio frequency emissions while maintaining communication quality, as SAR-based power limitations can impact voice calls and data transmission, leading to increased Block Error Rates and decreased quality of service.
Innovation Solution
A mobile device with multiple radio frequency resources and proximity sensors dynamically adjusts transmit power based on specific absorption information, prioritizing high-quality data transmissions over antennas with lower SAR indices to mitigate the impact of power back-off, using carrier aggregation schemes to optimize data packet scheduling and transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If transmitter power is limited based on SAR feedback to minimize user exposure to RF energy, then user safety is improved, but communication quality deteriorates due to increased Block Error Rates and decreased quality of service
Solution Approach 1:
The system dynamically adjusts transmitter power selection based on real-time SAR feedback and channel conditions. The network device dynamically switches between different transmit powers (first and second transmit powers) corresponding to different antenna ports, selecting the appropriate power level based on current SAR measurements and communication requirements, thereby resolving the contradiction between safety and reliability
Solution Approach 2:
The invention changes the parameter of transmitter power by providing multiple transmit power options (first and second transmit powers) for different antenna ports. The network device selects different power levels based on SAR feedback, allowing the system to operate at higher powers when SAR is low and switch to lower powers when SAR is high, thus maintaining both safety and communication quality
2Object-affected harmful factors
If transmitter power is reduced to meet SAR limits, then user safety is improved, but data transmission reliability worsens due to increased Block Error Rates
Solution Approach 1:
The invention introduces an intermediary mechanism where the network device receives SAR feedback information and uses it to intelligently select between different transmit powers. This intermediary SAR feedback system acts as a mediator that allows the system to balance between reducing RF exposure and maintaining data transmission reliability by making informed power selection decisions
Solution Approach 2:
The system dynamically adjusts the transmit power level based on real-time SAR feedback and channel conditions. When SAR is low, the system uses higher transmit power to maintain low Block Error Rates. When SAR increases, the system dynamically switches to lower transmit power, thus adapting to changing conditions to maintain both safety and reliability
3Reliability
If multiple antenna ports are used with different transmit powers, then communication quality is maintained under SAR constraints, but device complexity increases
Solution Approach 1:
The invention segments the antenna system into multiple antenna ports, each associated with different transmit powers. This segmentation allows the system to independently control power levels for different antenna ports based on their SAR characteristics, enabling the network device to select the most appropriate antenna port and power combination to maintain quality of service while complying with SAR constraints
Solution Approach 2:
The multiple antenna ports serve multiple functions: they provide both SAR compliance through power differentiation and communication quality maintenance through selective usage. The same antenna ports can operate at different power levels depending on SAR feedback, making the system universally adaptable to different SAR conditions while maintaining reliable communication
Data Source
AI summary
Techniques for reducing the impact of specific absorption rate (SAR) based on a transmit power back-off value in multi-antenna mobile devices are provided. An example mobile device includes a first radio frequency resource associated with first specific absorption information, a second radio frequency resource associated with second specific absorption information, and a processor configured to generate a first signal associated with a first quality of service, generate a second signal associated with a second quality of service, cause the first signal to be transmitted over one of the first radio frequency resource and the second radio frequency resource based at least in part on the first specific absorption information and the second specific absorption information, and cause the second signal to be transmitted over whichever of the first radio frequency resource and the second radio frequency resource is not used to transmit the second signal.