Dynamic Uplink Duty Cycle Control for Radio-Frequency Exposure
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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 power management techniques that can lead to reduced uplink coverage and radio link failures.
Innovation Solution
Dynamic adjustment of the uplink duty cycle is coordinated between the electronic device and the wireless network through proximity detection and communication channels like the physical uplink control channel (PUCCH) to ensure compliance with RF energy exposure regulations without significant delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If static maximum uplink duty cycle is used, then device complexity is reduced, but RF energy exposure compliance cannot be ensured under varying conditions
Solution Approach 1:
The patent implements dynamic adjustment of the uplink duty cycle based on real-time proximity detection results. The duty cycle is no longer fixed but varies according to the detected proximity of objects to the antenna, allowing the system to adapt to changing conditions while maintaining compliance with RF energy exposure regulations.
Solution Approach 2:
The system employs feedback through proximity detection mechanisms that continuously monitor the environment around the antenna. Based on this feedback, the uplink duty cycle is adjusted in real-time, creating a closed-loop control system that ensures RF energy exposure compliance without requiring complex pre-programming.
2Object-affected harmful factors
If power management techniques are applied to reduce RF exposure, then RF energy exposure compliance is improved, but uplink coverage and reliability deteriorate
Solution Approach 1:
The patent applies RF exposure management locally rather than globally. By using proximity detection to identify specific areas where RF exposure may be excessive, the system adjusts the uplink duty cycle only in those localized contexts, preserving uplink coverage and reliability in areas where exposure is not a concern.
Solution Approach 2:
The system changes the duty cycle parameter dynamically based on proximity detection results rather than applying fixed power management techniques. This allows selective adjustment of RF exposure parameters only when and where necessary, maintaining optimal uplink coverage while ensuring compliance.
3Adaptability or versatility
If dynamic duty cycle adjustment is implemented, then RF energy exposure compliance is ensured, but communication delay increases
Solution Approach 1:
The system performs proximity detection and duty cycle adjustment in advance of potential RF exposure issues. By proactively monitoring proximity and pre-adjusting the duty cycle when needed, the system avoids last-minute corrections that would cause communication delays.
Data Source
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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 radiofrequency 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.