UE Uplink Duty Cycle Control for RF Exposure Compliance
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Solution Overview
Problem
Existing wireless devices face challenges in maintaining efficient wireless communications while adhering to regulatory limits on radio-frequency exposure, particularly due to static maximum uplink duty cycles and reliance on power management reductions, which can lead to reduced uplink coverage and radio link failures.
Innovation Solution
A wireless network system that dynamically adjusts the maximum uplink duty cycle based on proximity detection, allowing user equipment to communicate an RF exposure event to the base station, which then updates the duty cycle to ensure compliance with regulatory limits without requiring maximum transmit power reductions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the maximum uplink duty cycle is kept static, then device complexity is reduced, but radio-frequency exposure regulatory limits cannot be satisfied when a user body is in proximity
Solution Approach 1:
The patent implements dynamic adjustment of the maximum uplink duty cycle based on proximity detection results. When a user body is detected in proximity to the electronic device, the system dynamically reduces the maximum uplink duty cycle to satisfy RF exposure regulatory limits. This dynamic parameter adjustment resolves the contradiction by adapting the duty cycle from a static value to a conditionally variable parameter that maintains compliance while minimizing operational disruption.
Solution Approach 2:
The system changes the operational parameters of wireless communication by adjusting the maximum uplink duty cycle in response to proximity conditions. When proximity detection indicates a user body is present, the parameter change involves reducing the duty cycle percentage, which directly controls the ratio of transmit time to total time. This parameter modification enables RF exposure compliance without requiring fundamental changes to the communication system architecture.
2Reliability
If maximum transmit power level reductions are applied to satisfy RF exposure limits, then RF exposure compliance is achieved, but uplink communications and throughput are degraded
Solution Approach 1:
The patent changes the operational parameter from transmit power level to uplink duty cycle to achieve RF exposure compliance. Instead of reducing the maximum transmit power level which directly impacts communication quality and throughput, the system adjusts the duty cycle parameter that controls the temporal distribution of transmissions. This parameter substitution maintains transmit power levels while reducing overall RF exposure through decreased transmission time ratio, thereby preserving uplink communications and throughput while achieving regulatory compliance.
3Reliability
If the maximum uplink duty cycle is dynamically adjusted, then RF exposure compliance is maintained, but coordination complexity between UE device and base station increases
Solution Approach 1:
The patent implements a feedback mechanism where the UE device reports proximity detection results to the base station, which then determines and communicates the adjusted maximum uplink duty cycle back to the UE device. This feedback loop enables coordinated dynamic adjustment without requiring complex bidirectional real-time negotiation. The base station leverages its network knowledge to make optimal duty cycle decisions based on proximity information, simplifying the coordination process while maintaining RF exposure compliance.
Solution Approach 2:
The base station acts as an intermediary that receives proximity detection information from the UE device and translates it into appropriate duty cycle adjustments. Rather than requiring direct complex coordination between multiple network elements and the UE device, the base station mediates the process by centralizing the duty cycle decision-making function. This intermediary role simplifies the overall system coordination while enabling dynamic RF exposure compliance.
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.