Uplink Beam Power Indication Under 5G NR MPE Limits
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Solution Overview
Problem
In 5G NR technologies, particularly in FR2, beam-based transmission faces challenges due to maximum permissible exposure (MPE) limits, which restrict transmit power to avoid harm to the human body, affecting uplink transmission performance.
Innovation Solution
A method for determining and indicating the maximum permissible transmit power of uplink beams to comply with MPE limits, involving the transmission of first indication information through various channels, such as UCI, PHR, and random access messages, to manage transmit power effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transmit power is increased to improve uplink transmission performance, then transmission quality is improved, but MPE limit is exceeded causing harm to human body
Solution Approach 1:
The patent changes the parameter of transmit power from a fixed maximum value to a dynamically adjusted value that adapts to MPE constraints. The network device receives MPE limit information from the terminal and adjusts the transmit power parameters accordingly, transforming the power transmission from an static parameter to one that can be modified based on safety requirements, thus resolving the contradiction between maintaining high transmission performance and avoiding MPE limit violations.
2Object-affected harmful factors
If transmit power is reduced to comply with MPE limits, then human body safety is protected, but uplink transmission performance deteriorates
Solution Approach 1:
The patent introduces dynamic adjustment of transmit power based on real-time MPE limit information. Instead of using a fixed reduced power level, the system continuously adapts the transmit power parameters according to the terminal's MPE capabilities, allowing the network to optimize transmission performance within safe power limits. This dynamic approach enables the system to maintain the best possible uplink performance while ensuring MPE compliance.
Solution Approach 2:
The patent implements a feedback mechanism where the terminal reports MPE limit information to the network device, which then adjusts transmit power parameters accordingly. This closed-loop feedback system allows the network to continuously optimize transmit power based on actual MPE constraints, preventing performance degradation by adapting to the terminal's specific safety requirements rather than applying a blanket power reduction.
3Object-affected harmful factors
If backoff control is applied to limit transmit power, then MPE limit is satisfied, but transmission efficiency is reduced
Solution Approach 1:
The patent applies preliminary action by having the terminal report MPE limit information to the network device before actual power transmission begins. This allows the network device to pre-calculate and configure appropriate transmit power parameters that inherently satisfy MPE limits, avoiding the need for reactive backoff control during transmission. By preparing the power parameters in advance based on known MPE constraints, the system maintains transmission efficiency while ensuring compliance.
Data Source
AI summary
A method for indicating a transmit power is performed by a terminal, and includes: determining a maximum permissible transmit power of at least one uplink beam of the terminal, wherein the maximum permissible transmit power is a maximum transmit power subject to satisfying a maximum permissible exposure (MPE) limit of the terminal; and transmitting first indication information for indicating the maximum permissible transmit power of the at least one uplink beam.