Uplink Array Selection Under MPE Limits for Multi-Panel Terminals

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Solution Overview

Problem

Existing multi-panel terminals face uplink coverage loss due to inadequate panel selection during maximum permissible exposure (MPE) events, as traditional power reduction methods fail to accurately reflect performance differences among multiple transmission panels.

Innovation Solution

The terminal transmits assistance information, including identification of optimal reference signals or power management maximum power reduction (P-MPR) values to the network side device, enabling accurate panel selection or beam sweeping to mitigate uplink coverage loss during MPE events.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If power reduction is performed on multi-panel terminal to meet MPE exposure limits, then safety requirements are satisfied, but uplink coverage deteriorates

Engineering Contradiction:

ImproveMPE exposure limit complianceVSAvoiduplink coverage

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The terminal is divided into multiple independent antenna panels, each capable of separate power control. When an MPE event is detected on one panel, only that specific panel's power is reduced while other panels maintain full power, preventing system-wide coverage deterioration.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The network side device changes the transmission parameter by selecting different antenna panels based on reported P-MPR values. Panels with lower power reduction requirements are prioritized for uplink transmission, dynamically adjusting which panel is active to maintain coverage while meeting MPE limits.

Inventive Principle:

Principle #35Parameter changes

2Object-affected harmful factors

If traditional power reduction method is used without accurate panel selection, then MPE events are handled, but network side device cannot accurately select optimal panel leading to coverage loss

Engineering Contradiction:

ImproveMPE event handlingVSAvoidpanel performance differentiation

Core Design Contradiction:

Object-affected harmful factorsVSMeasurement precision

Solution Approach 1:

The terminal provides feedback to the network side device by reporting P-MPR values and optimal reference signal identification for each antenna panel. This feedback enables the network to accurately understand the performance characteristics of each panel and make informed selection decisions.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

Assistance information acts as an intermediary between the terminal and network side device, conveying detailed panel-specific performance data (P-MPR values, optimal reference signals) that enables accurate panel selection without requiring complex direct measurements at the network side.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Measurement precision

If assistance information including P-MPR values and optimal reference signals is transmitted, then accurate panel selection is enabled, but communication overhead increases

Engineering Contradiction:

Improvepanel selection accuracyVSAvoidcommunication overhead

Core Design Contradiction:

Measurement precisionVSLoss of information

Solution Approach 1:

Only the essential and most relevant information for panel selection is extracted and transmitted: P-MPR values indicating power reduction requirements and optimal reference signal identification. Redundant information is excluded to minimize overhead while maintaining selection accuracy.

Inventive Principle:

Principle #2Taking out (Extraction)

4Reliability

If multiple antenna panels are used for uplink transmission, then diversity gain is achieved, but power reduction causes coverage deterioration

Engineering Contradiction:

Improvetransmission diversityVSAvoiduplink transmission power

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

The transmit system is segmented into multiple independent panels with individual power control. When MPE events occur, power reduction is applied only to affected panels while other panels continue transmitting at full power, maintaining overall transmission diversity and coverage.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The system dynamically selects which antenna panel to use for uplink transmission based on real-time MPE event status and reported P-MPR values. This dynamic adaptation allows the system to maintain diversity gain by switching between panels rather than uniformly reducing power across all panels.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS12610325B2Array selection method, terminal, network device, and storage medium

Publication Date: 2026.04.21 DATANG MOBILE COMM EQUIP CO LTD

AI summary

Provided are an array selection method, a terminal, a network device, and a storage medium. The method includes sending assistance information to a network device, and the assistance information includes at least one of the following: identifier information of an optimal reference signal required for uplink transmission, and an array-based maximum power reduction (P-MPR) value corresponding to one or more arrays of a terminal when a maximum power exposure (MPE) event occurs; and receiving indication information sent by the network device on the basis of the assistance information, and the indication information is used for indicating an array used by the terminal for subsequent uplink transmission, or for indicating that the terminal performs new uplink beam scanning. The embodiments of the present application avoid the uplink coverage loss caused by an MPE issue.