Dynamic SAR Tuning for User Equipment Antenna States
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Solution Overview
Problem
Conventional SAR regulation methods fix back-off power for all antenna states, leading to compromised user experience while attempting to meet SAR limitations.
Innovation Solution
A dynamic tuning method for UE that adjusts conducted RF power based on back-off values specific to current antenna states, ensuring transmission performance without exceeding SAR limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If back-off power is fixed for all antenna states, then SAR regulation requirements are met, but user experience deteriorates due to reduced transmission performance
Solution Approach 1:
The patent implements dynamic back-off power adjustment based on current antenna state. The processor dynamically determines appropriate back-off values from a pre-stored table corresponding to different antenna states, rather than using a fixed back-off value. This dynamic adaptation allows the system to optimize transmission performance for each antenna state while ensuring SAR compliance, directly resolving the contradiction between fixed SAR compliance and variable transmission performance needs.
Solution Approach 2:
The patent changes the back-off power parameter according to antenna state. A back-off table stores different back-off values corresponding to different antenna states, and the processor selects the appropriate back-off value based on the current antenna state. This parameter adaptation enables the system to maintain SAR compliance while optimizing transmission performance for each specific antenna configuration.
2Object-affected harmful factors
If back-off power is increased to ensure SAR compliance, then SAR limits are met, but user experience suffers due to power loss
Solution Approach 1:
The patent applies different back-off power reductions locally tailored to each antenna state. Instead of applying a uniform back-off value that would excessively reduce power for all states, the system determines specific back-off values corresponding to each antenna state's characteristics. This localized approach ensures SAR compliance for each state while minimizing unnecessary power loss and maintaining optimal transmission performance.
Solution Approach 2:
The system dynamically adjusts the back-off power level based on the current antenna state rather than applying a static, conservative back-off value. The processor selects from multiple pre-determined back-off values in a table, matching the appropriate value to the current antenna state. This dynamic adjustment prevents excessive power reduction while ensuring SAR compliance.
Data Source
AI summary
Dynamic tuning method for a specific absorption rate (SAR) is provided. The dynamic tuning method is applied to user equipment (UE). The dynamic tuning method may include the following steps: the UE may determine the back-off value corresponding to the current antenna state; and the UE may tune the conducted power of the radio frequency (RF) circuit of the UE based on the back-off value.