Beamforming Resource Set Selection for MPE Compliance
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Solution Overview
Problem
Wireless communication devices face challenges in complying with maximum permissible exposure limits for radio frequency energy exposure, leading to potential radio link failures and reduced throughput, especially in higher frequency bands and near-field scenarios.
Innovation Solution
The implementation of pseudorandom beamforming techniques, such as Zadoff-Chu sequences, to determine and optimize beamforming resource sets that comply with maximum permissible exposure limits, ensuring efficient uplink and sidelink communication while maintaining line of sight paths and reducing radiated power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If beamforming is used to improve communication throughput, then data transmission efficiency is improved, but maximum permissible exposure limits may be exceeded causing radio link failures
Solution Approach 1:
The patent implements dynamic beamforming resource set selection where the system transitions from static beamforming configurations to dynamic adaptation based on real-time MPE limit compliance. The network node determines multiple beamforming resource sets with different transmit beam directions and dynamically selects appropriate sets based on whether MPE limits are exceeded, allowing the system to maintain high throughput when limits are compliant and switch to alternative beam directions when limits are exceeded, thus resolving the contradiction between productivity and reliability.
Solution Approach 2:
The patent changes the parameter of beamforming resource set configuration from fixed to variable. The network node configures multiple beamforming resource sets with different parameters (transmit beam directions, resource allocations) and enables the user equipment to switch between these parameter sets based on MPE limit compliance status. This parameter change allows the system to optimize throughput under normal conditions while ensuring reliability when exposure limits are exceeded, preventing radio link failures.
2Reliability
If transmit power is increased to improve signal quality, then communication reliability is improved, but maximum permissible exposure limits are exceeded
Solution Approach 1:
The patent applies local quality by configuring different beamforming resource sets with specific transmit beam directions tailored for different scenarios. When MPE limits are not exceeded, beamforming resource sets with higher power and focused beam directions are used to improve signal quality. When MPE limits are exceeded, the system switches to alternative beamforming resource sets with different beam directions that redirect energy away from the user equipment, thus maintaining signal quality where needed while reducing harmful exposure locally at the user equipment position.
Solution Approach 2:
The patent introduces beamforming resource set configuration as an intermediary mechanism between transmit power control and MPE limit compliance. Instead of directly controlling transmit power, the system uses beamforming resource sets as an intermediary that indirectly controls the effective radiated power in different directions. The network node configures multiple resource sets, and the user equipment selects appropriate sets based on MPE compliance, allowing the system to achieve reliable communication while mediating the harmful exposure effect through spatial beam direction control.
3Productivity
If beamforming resource sets are optimized for throughput, then data transmission efficiency is improved, but compliance with exposure limits becomes difficult to maintain
Solution Approach 1:
The patent segments the beamforming resources into multiple distinct beamforming resource sets, each optimized for different conditions. Instead of using a single beamforming configuration, the system divides resources into multiple sets with different transmit beam directions and characteristics. This segmentation allows the system to maintain high data transmission efficiency by selecting the optimal set for current conditions while simultaneously maintaining exposure limit compliance flexibility by having alternative sets available when MPE limits are exceeded, thus resolving the contradiction between productivity and adaptability.
Data Source
AI summary
Disclosed is a method comprising obtaining measurement information comprising radio environment measurements associated with a user device; determining, based at least on the measurement information and a maximum permissible exposure limit, one or more beamforming resource sets for the user device such that the maximum permissible exposure limit is not exceeded with at least one beamforming resource set of the one or more beamforming resource sets; and transmitting a message indicative of the at least one beamforming resource set to be used for selecting at least one transmit beam direction at the user device in case the maximum permissible exposure limit is exceeded.