Radio Power Control in Reduced Power Mode for RF Exposure Compliance
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Solution Overview
Problem
Wireless communication devices face challenges in maintaining radio frequency (RF) exposure compliance when operating in reduced power modes, such as wake-on-wireless (WoW) mode, due to potential exceedance of RF exposure limits and resulting performance issues.
Innovation Solution
The wireless device monitors and adjusts transmit power usage of radios during reduced power mode to ensure compliance with RF exposure limits by reducing power consumption through actions like refraining from responding to packets, reducing transmission power, and evaluating alternative communication links.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the wireless device operates in reduced power mode with higher transmit power to maintain communication performance, then communication throughput and transmission range are improved, but RF exposure compliance deteriorates
Solution Approach 1:
The system dynamically adjusts transmit power based on real-time monitoring of power usage over time intervals. The radio controller modifies power levels adaptively to maintain compliance with RF exposure limits while optimizing communication performance, transitioning between different power states based on current usage patterns and remaining time in the interval.
Solution Approach 2:
The patent changes the transmit power parameter dynamically based on the time interval and current power usage. By adjusting this key parameter according to monitoring data and compliance requirements, the system resolves the contradiction between maintaining high throughput and staying within RF exposure limits.
2Object-affected harmful factors
If the wireless device reduces transmit power to maintain RF exposure compliance, then RF exposure compliance is improved, but communication performance deteriorates
Solution Approach 1:
The system performs preliminary monitoring of power usage during the time interval and makes proactive adjustments before compliance violations occur. By anticipating potential violations and adjusting power levels in advance, the system maintains compliance while minimizing impact on communication performance.
Solution Approach 2:
The patent implements a feedback mechanism where the radio controller continuously monitors transmit power usage and uses this information to adjust future power levels. This closed-loop control ensures compliance while optimizing performance by learning from past usage patterns and adapting accordingly.
3Object-affected harmful factors
If the wireless device monitors and adjusts transmit power dynamically, then RF exposure compliance is maintained, but device complexity increases
Solution Approach 1:
The radio controller performs self-monitoring and self-adjustment of transmit power without requiring external intervention. The system services its own compliance requirements by autonomously tracking power usage and making necessary adjustments, reducing the need for complex external control mechanisms.
Data Source
AI summary
Certain aspects of the present disclosure provide techniques and apparatus for operating a wireless communication device pursuant to radio frequency (RF) exposure compliance. An example method of wireless communication includes monitoring transmit power usage of a radio of the wireless device during a time interval in which the wireless device is in a reduced power mode. The transmit power usage over a first portion of the time interval is determined to satisfy one or more first criteria associated with lack of compliance with an RF exposure limit, based on the monitoring. Responsive to the determination, the radio is controlled during a second portion of the time interval in compliance with the RF exposure limit based at least in part on the transmit power usage over the first portion of the time interval.