MPE Assistance Reporting in Millimeter-Wave Systems
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Solution Overview
Problem
Current mobile communication systems face challenges in managing maximum permissible exposure (MPE) events, particularly in millimeter-wave regimes, where user devices need to reduce output power to comply with exposure guidelines, leading to potential radio link failures and user experience disruptions.
Innovation Solution
The system implements an apparatus and method for detecting MPE events, determining their severity, and reporting assistance information to the network, which triggers power backoff or duty cycle adjustments to meet MPE requirements, including scheduled and unscheduled reporting mechanisms to ensure compliance with exposure guidelines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If output power is reduced to comply with MPE exposure guidelines, then user safety and regulatory compliance are improved, but radio link reliability deteriorates
Solution Approach 1:
The system performs preliminary actions by detecting MPE events before they cause radio link failures and sends MPE assistance information to the network in advance. The UE monitors for MPE events continuously and triggers early warnings, allowing the network to proactively adjust parameters such as power backoff, duty cycle limits, and scheduling configurations before link failures occur.
Solution Approach 2:
The system implements feedback mechanisms through the MPE assistance information reporting channel, where the UE continuously reports MPE event status, severity levels, and compliance status to the network. The network uses this feedback to dynamically adjust uplink power backoff, duty cycle configurations, and scheduling decisions, creating a closed-loop control system that maintains both MPE compliance and radio link reliability.
2Loss of energy
If scheduled reporting is used to reduce signaling overhead, then network resource efficiency is improved, but response time to MPE events deteriorates
Solution Approach 1:
The system dynamically adapts the reporting mechanism based on MPE event severity. For high-severity events that require immediate network action, the system uses unscheduled reporting to minimize response time. For low-severity or stable MPE conditions, the system transitions to scheduled periodic reporting to reduce signaling overhead. This dynamic switching optimizes the balance between response time and resource efficiency.
Solution Approach 2:
The system changes reporting parameters based on MPE event characteristics. The reporting periodicity, message content, and transmission priority are adjusted according to the severity level and duration of MPE events. This parameter adaptation allows the system to minimize signaling overhead during stable conditions while ensuring rapid response when critical MPE events occur.
3Object-affected harmful factors
If power backoff is applied to meet MPE requirements, then regulatory compliance is improved, but transmission productivity deteriorates
Solution Approach 1:
The system applies periodic duty cycle adjustments instead of continuous power backoff. By configuring duty cycle limits and using periodic transmission patterns, the system maintains MPE compliance while maximizing data transmission during permitted time windows. This periodic action allows higher instantaneous transmission rates during compliant periods compared to continuous power backoff.
Solution Approach 2:
The system dynamically changes transmission parameters including power backoff levels, duty cycle percentages, and scheduling configurations based on MPE event severity and duration. For temporary or low-severity MPE events, the system applies minimal power backoff or uses duty cycle adjustments to maintain higher productivity. For severe or persistent MPE events, more aggressive parameter changes ensure compliance while minimizing productivity loss.
Data Source
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AI summary
An apparatus, method and computer program is described comprising: detecting an occurrence of a maximum permissible exposure event; and reporting maximum permissible exposure assistance information in response to the detection of the occurrence of the maximum permissible exposure event, wherein reporting the maximum permissible exposure assistance information comprises: generating a scheduled report in the event that a periodic scheduling override condition is invalid, wherein the scheduled report is sent when a first time period expires; and generating an unscheduled report in the event that the periodic scheduling override condition is valid, wherein the unscheduled report is sent without waiting for the first time period to expire.