Terminal Device Power Back-Off for Uplink Beam Safety
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Solution Overview
Problem
In new radio (NR) systems, terminal devices face challenges in ensuring safe transmission power levels when close to a human body, as directional transmit beams can exceed safety limits, leading to performance degradation in uplink transmission due to inadequate power back-off mechanisms.
Innovation Solution
A method where the terminal device reports power back-off information to the network device regarding each transmit beam or reference signal resource, allowing for timely adjustments and optimal beam management to maintain safe power levels and improve transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the terminal device uses multiple beams for uplink transmission, then the transmission power or EIRP may exceed safety limits when close to the human body, but reducing transmission power through power back-off degrades uplink transmission performance
Solution Approach 1:
The patent segments the uplink transmission into multiple independent beams, each with its own power back-off value. The terminal device determines different power back-off values for different transmit beams based on their respective positional relationships with the human body, allowing selective power control per beam rather than uniform power reduction across all beams.
Solution Approach 2:
The patent implements dynamic power back-off adjustment where the terminal device continuously monitors the positional relationship between transmit beams and the human body, and dynamically determines appropriate power back-off values for each beam. This dynamic adaptation allows the system to maintain optimal transmission performance while ensuring safety when beams are close to the human body.
2Object-affected harmful factors
If the terminal device performs power back-off on transmit beams aligned with the human body, then safety limits are met, but transmission performance is degraded due to reduced power
Solution Approach 1:
The patent applies local quality control by determining different power back-off values for different transmit beams based on their individual positional relationships with the human body. Only beams that are aligned with or close to the human body undergo power back-off, while beams directed away from the human body maintain their full transmission power, thus applying safety measures locally rather than globally.
3Object-affected harmful factors
If the terminal device uses different power back-off values for different transmit beams, then safety is maintained, but beam management complexity increases
Solution Approach 1:
The patent implements a feedback mechanism where the terminal device sends power back-off information corresponding to different transmit beams to the network device. The network device uses this feedback to determine appropriate power back-off values for each beam, reducing the complexity at the terminal device while ensuring compliance with safety limits through coordinated beam management.
Data Source
AI summary
A method for information processing and a terminal device are provided. The method includes the following. A terminal device sends to a network device power back-off information corresponding to at least one transmit beam or reference signal resource.