Proximity-Based Uplink Duty Cycle Adjustment Without Power Reduction
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Solution Overview
Problem
Existing wireless devices face challenges in providing efficient wireless communications while adhering to regulatory limits on radio-frequency exposure, particularly due to static maximum uplink duty cycles and reliance on maximum power reductions, which can lead to reduced uplink coverage and radio link failures.
Innovation Solution
The system dynamically adjusts the uplink duty cycle based on proximity detection, allowing the device to communicate with the base station to ensure compliance with RF exposure regulations without requiring maximum power reductions, using proximity detection and coordinated adjustments through the physical uplink control channel and feedback signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If maximum power reductions are used to comply with RF exposure limits, then RF exposure compliance is improved, but uplink coverage and communication efficiency deteriorate
Solution Approach 1:
The patent implements dynamic adjustment of the uplink duty cycle based on real-time proximity detection results. Instead of using static maximum power reductions, the system continuously monitors whether a user is in proximity to the device and dynamically modifies the uplink transmission duty cycle accordingly. This dynamic approach allows the system to maintain maximum power levels when safe (improving uplink coverage) while automatically reducing exposure when needed (ensuring RF compliance).
Solution Approach 2:
The patent changes the operational parameters of uplink transmission by adjusting the duty cycle rather than reducing maximum power levels. The system modifies the time-averaged exposure parameter (duty cycle) while maintaining the peak power capability, thereby achieving RF exposure compliance through parameter optimization rather than power reduction. This allows the device to transmit at full power for shorter durations, maintaining communication efficiency while complying with exposure limits.
2Device complexity
If static maximum uplink duty cycle is used, then device simplicity is improved, but communication efficiency and RF exposure compliance deteriorate
Solution Approach 1:
The patent implements self-service through autonomous proximity detection and automatic duty cycle adjustment. The device uses its own sensors to detect user proximity and automatically modifies its transmission parameters without requiring external intervention or complex coordination. This self-service mechanism maintains relative system simplicity while dramatically improving communication efficiency and RF compliance through real-time adaptive control.
Solution Approach 2:
The patent incorporates feedback loops where proximity detection results continuously inform duty cycle adjustments. The system monitors proximity conditions and feeds this information back to the transmission controller, which adjusts the uplink duty cycle in response. This feedback mechanism enables the system to adapt to changing conditions dynamically, improving both communication efficiency and RF compliance without requiring overly complex predetermined control schemes.
3Object-affected harmful factors
If maximum power reductions are applied, then RF exposure limits are satisfied, but uplink throughput and communication performance deteriorate
Solution Approach 1:
The patent employs periodic action through duty cycle modulation, where uplink transmissions occur in periodic bursts rather than continuous operation. By controlling the proportion of time spent transmitting (the duty cycle), the system achieves time-averaged exposure compliance while maintaining high peak power levels during active transmission periods. This periodic transmission pattern preserves uplink throughput by allowing full-power transmissions when needed, while ensuring overall exposure remains within limits through temporal distribution of transmission energy.
Data Source
AI summary
A wireless network may include a base station and user equipment (UE). The UE may transmit uplink (UL) signals to the base station using a dynamically adjustable maximum UL duty cycle. When the UE identifies that a user is in proximity to the UE, the UE may transmit an indicator to the base station. The indicator may identify that a radio-frequency exposure (RFE) event has occurred and/or a suggested maximum UL duty cycle that would allow the UE to satisfy limits on RFE. The base station may limit a UL grant to the UE so that the UE performs subsequent communications using the suggested maximum UL duty cycle or a different maximum UL duty cycle. Coordinating adjustment of UL duty cycle in this way may allow the UE to meet limits on RFE without requiring the UE to perform maximum transmit power level reductions.