Antenna Front-End Switching Under SAR and Temperature Limits
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Solution Overview
Problem
Existing antenna switching techniques in data transmission systems primarily rely on reference signal received power (RSRP) without considering factors like heat emission and specific absorption rate (SAR), which can lead to suboptimal performance in changing communication environments.
Innovation Solution
A data transmission device and method that select a front-end module based on temperature and SAR requirements, switching to an antenna with lower temperature and higher received power to ensure optimal performance while adhering to SAR and maximum permissible exposure (MPE) limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If antenna switching is performed based only on RSRP, then signal reception quality is improved, but heat emission and SAR compliance are not considered leading to potential safety issues
Solution Approach 1:
The patent changes the selection parameters for antenna switching from only RSRP to include temperature and SAR/MPE values. The controller determines temperature of each front-end module and obtains SAR-based or MPE-based received power values, then selects the antenna based on these multiple parameters rather than RSRP alone, thereby addressing both signal quality and safety concerns
Solution Approach 2:
The system implements feedback by continuously monitoring temperature of front-end modules and SAR/MPE compliance status. This feedback mechanism allows the controller to adjust antenna selection decisions dynamically, switching away from antennas that exceed temperature or SAR/MPE thresholds even if their RSRP is high
2Reliability
If multiple factors are considered in antenna switching, then safety and performance are improved, but system complexity increases
Solution Approach 1:
The controller performs preliminary determination of temperature and SAR/MPE values for each front-end module before making the antenna switching decision. By pre-calculating these parameters and comparing them against thresholds, the system simplifies the final selection process while ensuring all safety and performance criteria are met
Solution Approach 2:
The patent segments the antenna selection process into distinct evaluation stages: RSRP measurement, temperature determination, SAR/MPE calculation, and final selection. Each front-end module is evaluated independently across these segments, allowing systematic comparison and selection based on multiple criteria without overwhelming system complexity
Data Source
AI summary
A data transmission device and a data transmission method are provided. The data transmission device includes: a plurality of front-end modules associated with a plurality of antennas, respectively; and a controller configured to select a front-end module to be used for data communication from among the plurality of front-end modules, wherein the controller is configured to: determine a temperature of each of the plurality of front-end modules; and select, from among the plurality of front-end modules, a front-end module having a temperature lower than or equal to a threshold temperature and corresponding to a maximum received power of a receiving device, among received powers of the receiving device corresponding to the plurality of front-end modules, and wherein each of the received powers of the receiving device is obtained based on a specific absorption rate (SAR) requirement or a maximum permissible exposure (MPE) requirement of a corresponding front-end module.