Relay Node Beamforming for MPE Compliance
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Solution Overview
Problem
Wireless communication systems face challenges in managing maximum permissible exposure (MPE) limits, particularly when humans approach relay nodes, leading to potential violations of exposure limits due to fixed or semi-fixed beamforming configurations.
Innovation Solution
A relay node detects proximity to humans and autonomously or with control node assistance updates its beamforming configuration to ensure that beamformed communications comply with MPE limits by adjusting spatial aspects and transmit power, thereby mitigating RF exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a fixed or semi-fixed beamforming configuration is used at relay nodes, then device complexity is reduced and ease of operation is improved, but maximum permissible exposure (MPE) limits may be violated when humans approach the relay nodes
Solution Approach 1:
The patent implements dynamic beamforming configuration that automatically adjusts when a human is detected within proximity of the relay node. The system transitions from static to dynamic operation by monitoring human presence and reconfiguring beamforming parameters (beam direction, spatial distribution, or transmit power) in real-time to maintain compliance with MPE limits while preserving normal operation when no human is present.
2Object-affected harmful factors
If beamforming configuration is dynamically updated to comply with MPE limits, then MPE compliance is improved, but device complexity and processing requirements increase
Solution Approach 1:
The relay node autonomously performs MPE compliance by detecting human presence and automatically reconfiguring its beamforming parameters without requiring external control or manual intervention. The system self-monitors its transmission exposure and self-adjusts operational parameters to maintain compliance, reducing the need for complex external control infrastructure.
Solution Approach 2:
The system manages complexity by changing specific beamforming parameters (such as beam direction angles, spatial distribution patterns, or transmit power levels) rather than redesigning the entire system architecture. This targeted parameter adjustment approach allows MPE compliance to be achieved through configurable modifications to existing beamforming operations.
3Object-affected harmful factors
If beamforming configuration is updated in response to human detection, then MPE compliance is improved, but network performance and communication quality may deteriorate
Solution Approach 1:
The system applies beamforming reconfiguration locally and selectively - only adjusting beams directed toward the detected human while maintaining original beam configurations for other directions. This localized adjustment preserves network performance for legitimate communications while ensuring MPE compliance only in the problematic direction, rather than degrading overall system performance.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A relay node may detect that a person is within a proximity threshold of the relay node, the proximity threshold being associated with a maximum permissible exposure limit. The relay node may determine, based at least in part on the detecting, that a first beamforming configuration is to be updated, the first beamforming configuration associated with beamformed communications relayed by the relay node between a first wireless node and a second wireless node using a first beam. The relay node may identify a second beamforming configuration for relay of the beamformed communications between the first wireless node and the second wireless node via a second beam having an exposure indicia that satisfies the maximum permissible exposure limit. The relay node may relay the beamformed communications between the wireless nodes using the second beam in accordance with the second beamforming configuration.