Dynamic RF Exposure Management for Multi-Radio Wireless Devices
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Solution Overview
Problem
Wireless devices equipped with multiple radios face challenges in ensuring RF exposure compliance across various transmission scenarios, as existing methods require complex look-up tables and prepopulated static limits for each radio combination, which can be resource-intensive and inflexible.
Innovation Solution
The implementation of a method for wireless communication devices to evaluate RF exposure compliance sequentially per radio, determining allowable transmit powers based on past exposure, allowing dynamic allocation of exposure across radios within a time interval to ensure compliance with RF exposure limits, thereby reducing the need for extensive look-up tables and enhancing communication performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If complex look-up tables and prepopulated static limits are used for each radio combination, then RF exposure compliance is ensured, but device complexity and resource consumption increase
Solution Approach 1:
The patent segments the RF exposure management by separating the determination of exposure metrics from the determination of transmit power limits. Instead of using a single complex look-up table for each radio combination, the system divides the process into: (1) determining exposure metrics for each radio independently, (2) calculating a combined exposure metric, and (3) determining transmit power limits based on the combined metric. This segmentation reduces the complexity of prepopulated tables while maintaining compliance accuracy.
Solution Approach 2:
The patent transitions from static prepopulated limits to dynamic calculation of transmit power limits. The system calculates exposure metrics and transmit power limits in real-time based on current transmission conditions, radio combinations, and temporal patterns rather than relying on fixed pre-determined values. This dynamic approach adapts to varying scenarios without requiring exhaustive look-up tables for every possible configuration.
2Reliability
If static limits are prepopulated for each radio combination, then RF exposure compliance is maintained, but adaptability to different transmission scenarios is reduced
Solution Approach 1:
The system implements dynamic calculation of exposure metrics and transmit power limits that adapt to different transmission scenarios in real-time. Rather than relying on prepopulated static limits, the system calculates metrics based on current radio combinations, temporal patterns, and transmission conditions, enabling flexible adaptation to any scenario without requiring prior configuration.
Solution Approach 2:
The patent changes the approach from fixed parameter tables to dynamic parameter calculation. The system computes exposure metrics and transmit power limits as variables that change based on current operating conditions, radio configurations, and temporal patterns. This parameter transformation enables the system to handle diverse transmission scenarios by calculating appropriate limits on-demand rather than selecting from pre-defined options.
3Measurement precision
If extensive look-up tables are used to cover all radio combinations, then compliance accuracy is improved, but processing time and latency increase
Solution Approach 1:
The patent segments the compliance checking process into independent exposure metric determinations for each radio followed by a combination step. This segmentation allows the system to process each radio's exposure separately using efficient algorithms rather than searching through comprehensive multi-radio look-up tables, significantly reducing processing time while maintaining accurate combined exposure assessment.
Solution Approach 2:
The system performs preliminary determination of exposure metrics for individual radios before combining them. By pre-calculating and storing exposure metrics for each radio independently (rather than pre-populating complex multi-radio combinations), the system reduces the computational burden during real-time compliance checking while maintaining the accuracy needed for combined exposure assessment.
4Productivity
If dynamic power allocation is implemented across multiple radios, then communication throughput is increased, but RF exposure compliance becomes more difficult to manage
Solution Approach 1:
The patent transforms the power management approach by changing from static per-radio power limits to dynamic power allocation based on combined exposure metrics. The system calculates transmit power limits for multiple radios based on their combined exposure impact, allowing flexible power distribution that maximizes throughput while maintaining compliance. This parameter transformation enables efficient resource utilization without requiring complex manual configuration for each radio combination.
Data Source
AI summary
Techniques and apparatus for radio frequency (RF) exposure management for multiple radios are described. An example method of wireless communication by a wireless device generally includes determining a first exposure associated with a first radio for a first transmission in a first time interval; determining a first allowable transmit power associated with a second radio for a second time interval based at least in part on the first exposure associated with the first radio; and transmitting a first signal at a first transmit power in the second time interval using the second radio based on the first allowable transmit power.