Multi-bandwidth Power Configuration for SAR Compliance
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Solution Overview
Problem
In multi-bandwidth transmission scenarios, especially in carrier aggregation, the Specific Absorption Rate (SAR) often exceeds the standard due to conflicting requirements between transmission capability and radiation limits, particularly when multiple bandwidths are used simultaneously by terminals, leading to potential health and regulatory issues.
Innovation Solution
A power configuration method where a base station determines an overall equivalent power value for multiple bandwidths and adjusts power configuration parameters to ensure that the SAR does not exceed the standard by calculating and managing the equivalent power values and duty cycles across different bandwidths, thereby optimizing power allocation and reducing SAR values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If higher transmit power is introduced to ensure uplink coverage enlargement, then the uplink coverage is improved, but the SAR value exceeds the standard
Solution Approach 1:
The patent segments the total transmit power across multiple bandwidths by calculating equivalent power values for each bandwidth separately. The base station divides the uplink bandwidth into multiple parts (first bandwidth, second bandwidth, etc.) and configures power parameters for each segment independently, ensuring that the sum of equivalent power values across all segments does not exceed the SAR standard while maintaining adequate coverage in each segment.
Solution Approach 2:
The patent changes power configuration parameters (power values and duty cycles) for different bandwidths based on calculated equivalent power values. When the overall equivalent power value exceeds the configuration upper limit, the base station adjusts the power parameters of individual bandwidths to reduce the total equivalent power, thereby complying with SAR standards while optimizing coverage.
2Productivity
If multiple bandwidths are aggregated for carrier aggregation, then transmission capability is improved, but the SAR value exceeds the standard in some time windows
Solution Approach 1:
The patent implements a feedback mechanism where the base station calculates the overall equivalent power value by summing the equivalent power values of all aggregated bandwidths. When the overall equivalent power value exceeds the configuration upper limit, the base station provides feedback to adjust the power parameters of the aggregated bandwidths, ensuring that the cumulative SAR across multiple bandwidths remains within standards while maintaining transmission capability.
Solution Approach 2:
The patent dynamically adjusts power configuration parameters for aggregated bandwidths based on real-time equivalent power calculations. The base station monitors the overall equivalent power value and dynamically modifies power values and duty cycles of individual bandwidths to ensure compliance with SAR standards while optimizing transmission performance across the aggregated carrier.
3Volume of moving object
If power configuration parameters are increased for high power UE, then uplink coverage is improved, but the transmission capability exceeds the OTA index while SAR is violated
Solution Approach 1:
The patent changes power configuration parameters (power values and duty cycles) for different bandwidths based on calculated equivalent power values. When the overall equivalent power value exceeds the configuration upper limit, the base station adjusts the power parameters of individual bandwidths to reduce the total equivalent power, thereby complying with SAR standards while optimizing coverage.
Data Source
AI summary
A power configuration method includes: a base station determining the configuration upper limit of an overall equivalent power value of a terminal when performing multi-bandwidth transmission on n bandwidths; the base station generating, for the terminal, configuration information of a first bandwidth among n bandwidths, the overall equivalent power value on the n bandwidths corresponding to the configuration information being not higher than the upper limit of the configuration; the base station sending configuration information to the terminal.