Dynamic Transmit Power Allocation for RF Exposure Compliance
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Solution Overview
Problem
Wireless communication devices face challenges in complying with RF exposure limits set by domestic and international standards, necessitating an extensive certification process prior to market shipment.
Innovation Solution
A method and apparatus for allocating transmit power to radios based on RF exposure information and other criteria, allowing for separate RF exposure compliance per antenna group, while maintaining link quality and service, using backoff factors to determine antenna grouping and ensuring compliance with time-averaged RF exposure requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transmit power is increased to improve communication quality, then link quality and service are improved, but RF exposure requirements are violated
Solution Approach 1:
The patent implements dynamic transmit power allocation that adjusts power levels in real-time based on RF exposure conditions, time windows, and communication requirements. The system continuously monitors and adapts power distribution across multiple radios and channels, transitioning from static to dynamic power control to simultaneously achieve link quality and RF exposure compliance.
Solution Approach 2:
The system changes power allocation parameters by distributing total transmit power across multiple radios and channels according to specific criteria. It modifies power distribution parameters dynamically, adjusting the proportion of power allocated to each radio/channel based on RF exposure information, communication priority, and time-window constraints to resolve the contradiction between link quality and RF exposure.
2Adaptability or versatility
If separate RF exposure compliance per antenna group is implemented, then RF exposure management flexibility is improved, but device complexity increases
Solution Approach 1:
The patent segments the antenna system into multiple antenna groups, with each group subject to separate RF exposure compliance requirements. This segmentation allows independent power allocation and compliance management for each group, providing flexibility in RF exposure management while distributing the compliance burden across multiple manageable units rather than treating the entire system as a single complex entity.
Solution Approach 2:
The power allocation mechanism serves multiple functions simultaneously: it manages RF exposure compliance for each antenna group, optimizes link quality, distributes power across radios and channels, and adapts to time-window constraints. This multi-functional approach reduces overall system complexity by using a single unified power allocation framework to achieve multiple objectives.
3Reliability
If time-window based power allocation is used, then RF exposure compliance is improved, but power allocation complexity increases
Solution Approach 1:
The system implements periodic power allocation based on defined time windows, where power distribution is recalculated and adjusted at regular intervals. This periodic approach simplifies compliance management by breaking continuous RF exposure control into discrete time-based segments, making the power allocation process more manageable while maintaining compliance throughout the evaluation period.
Solution Approach 2:
The system performs preliminary power allocation calculations before each time window based on predicted RF exposure conditions and communication requirements. By pre-calculating power distribution strategies and preparing allocation plans in advance, the system reduces real-time computational complexity while ensuring compliance is maintained throughout the time window.
4Adaptability or versatility
If power is allocated across multiple radios and channels, then communication versatility is improved, but total transmit power consumption increases
Solution Approach 1:
The system optimizes power consumption by dynamically changing power allocation parameters across radios and channels. It adjusts the power distribution ratio for each radio and channel based on communication priority, channel conditions, and RF exposure constraints, ensuring that total power consumption is minimized while maintaining necessary communication versatility and compliance.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may allocate a first amount of power to one or more radios for a time window based on radio frequency (RF) exposure information and one or more other criteria. The UE may allocate a second amount of power to a selected channel or communication utilized by at least one radio of the one or more radios for one or more time frames within the time window based on the first amount of power allocated to the at least one radio for the time window. The UE may transmit the selected channel or communication based on the first amount of power or the second amount of power. Numerous other aspects are described.