Uplink Beam Selection for MPE Compliance in Wireless Systems
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Solution Overview
Problem
Current methods for transmitting uplink signals in wireless communication systems face challenges in meeting the Maximum Permissible Exposure (MPE) limits, leading to reduced uplink coverage and throughput degradation.
Innovation Solution
A method for transmitting uplink signals based on specific beams configured to meet MPE limitations, where the specific beam's transmit power is adjusted and its direction is determined to avoid harmful exposure, and the user equipment (UE) can select from multiple candidate beams to ensure compliance with MPE conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If transmit power is limited to meet MPE requirements, then safety compliance is improved, but uplink coverage is reduced
Solution Approach 1:
The patent applies local quality by configuring different transmit power levels for different uplink signals (e.g., SRS, PUCCH, PUSCH) and different spatial directions (beams). Instead of uniformly limiting power across all transmissions, the system selectively applies power control to specific signals and beams, allowing MPE compliance in sensitive directions while maintaining adequate coverage in other directions.
Solution Approach 2:
The patent implements dynamic beam management where the system can switch between different beams based on channel conditions and MPE requirements. The beam configuration is not static but can be adjusted dynamically, allowing the system to adapt to changing conditions and maintain both MPE compliance and coverage by selecting appropriate beams for different transmission scenarios.
2Object-affected harmful factors
If power limitation is applied to meet MPE limits, then safety compliance is improved, but throughput is degraded
Solution Approach 1:
The patent changes multiple parameters simultaneously rather than just power level. It adjusts transmit power, selects specific beams with favorable characteristics, and chooses appropriate spatial relations. These combined parameter changes allow the system to meet MPE requirements while maintaining throughput by exploiting spatial diversity and selecting optimal transmission configurations.
Solution Approach 2:
The patent introduces spatial dimension (beam direction) as an additional degree of freedom to solve the power limitation problem. Instead of only controlling power magnitude, the system leverages spatial relationships and beamforming to achieve MPE compliance. This dimensional approach allows maintaining transmission quality by directing energy in favorable spatial directions rather than simply reducing overall power.
3Object-affected harmful factors
If specific beam configuration is used to meet MPE limits, then MPE compliance is improved, but device complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring spatial relations and beam parameters through higher-layer signaling (RRC configuration) before actual transmission occurs. The system establishes beam configurations, spatial relationships, and power control parameters in advance, so that during actual uplink transmission, the UE can directly apply these pre-configured parameters without complex real-time calculations, thereby reducing runtime complexity while ensuring MPE compliance.
4Adaptability or versatility
If multiple candidate beams are provided for selection, then flexibility is improved, but configuration complexity increases
Solution Approach 1:
The patent segments the beam configuration into multiple independent candidate beams, each with its own spatial relation and power parameters. Instead of managing one complex beam configuration, the system divides the configuration into multiple simpler, independent beam options. The UE can then select from these segmented configurations based on current conditions, achieving flexibility while keeping individual configuration elements manageable and simple.
Data Source
AI summary
A method of transmitting an uplink signal by a user equipment in a wireless communication system includes receiving configuration information related to transmission of an uplink signal and transmitting the uplink signal based on the configuration information. The configuration information includes information indicating a specific beam related to a maximum permissible exposure (MPE) of a radio frequency (RF), and the transmission of the uplink signal is based on the specific beam.