Uplink Transmit Power Control for RF Exposure Compliance
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Solution Overview
Problem
Wireless communication devices face challenges in efficiently adjusting transmission powers to comply with radio frequency (RF) exposure limits, particularly in varying conditions, which can lead to non-compliance and reduced communication reliability.
Innovation Solution
The implementation of techniques that determine uplink transmit power limits based on RF exposure limits and computed uplink transmission periods, using predictive models and network signaling to adjust power levels dynamically within specific time windows, ensuring compliance while optimizing power usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transmission power is increased to improve communication reliability, then communication reliability is improved, but RF exposure compliance deteriorates
Solution Approach 1:
The patent implements dynamic transmission power adjustment by computing the uplink transmission period based on historical actual transmission periods and using this computation to determine appropriate power levels within time windows, allowing the system to adapt power settings in real-time based on actual communication conditions rather than using fixed power levels
Solution Approach 2:
The patent changes the parameter of transmission power based on the computed uplink transmission period. By calculating the actual transmission period from historical data and using it to adjust power levels, the system modifies the power parameter dynamically to maintain both reliability and RF exposure compliance
2Object-affected harmful factors
If transmission power is decreased to comply with RF exposure limits, then RF exposure compliance is improved, but communication reliability deteriorates
Solution Approach 1:
The system dynamically adjusts transmission power within time windows based on computed uplink transmission periods, allowing power to be optimized for each specific time period rather than using a fixed conservative level, thus maintaining reliability while ensuring compliance
Solution Approach 2:
The patent uses feedback from historical actual transmission periods to compute the uplink transmission period, which then informs power adjustment decisions. This closed-loop feedback mechanism ensures that power levels are set appropriately based on actual communication needs while maintaining RF exposure compliance
3Device complexity
If fixed transmission power is used to simplify power control, then device complexity is reduced, but RF exposure compliance and communication reliability deteriorate
Solution Approach 1:
The device performs self-service by autonomously computing its own uplink transmission period based on historical data and using this computation to determine appropriate power levels, eliminating the need for complex centralized power control while maintaining compliance and reliability
Data Source
AI summary
Methods, systems, and devices for wireless communications are described that support techniques for transmission power determination for radio frequency (RF) exposure compliance. A transmitting device, such as a user equipment (UE) may determine an uplink transmit power limit for a time window based on an RF limit and a duration of the time window. The device may use the power limit to determine an uplink transmit power based on a computed uplink transmission period for the time window that accounts for a time period during which the device is expected to actually transmit. The computed uplink transmission period may be based on one or more actual uplink transmission periods during one or more prior time windows, a predictive model, network signaling, or any combinations thereof. The device may transmit one or more uplink transmissions during the time window using the determined uplink transmit power.