Uplink Beam Pair Switching for MPE-Aware PHR Reporting

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Solution Overview

Problem

Existing communication systems face challenges in addressing Maximum Permissible Exposure (MPE) limits, leading to power backoff that can reduce link capacity and impact communication range, especially in FR2 frequency range where multiple beam pair links are used, with current PHR reporting failing to effectively indicate MPE issues to the gNB.

Innovation Solution

The UE is configured to determine whether to transmit a power headroom report using a different beam pair link than calculated, based on conditions such as negative power headroom or MPE constraints, and includes separate MPE/P-MPR reporting in a MAC CE, identifying the affected beam pair link through spatial relation RS, PUCCH group index, or pathloss reference RS.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If power backoff is applied to comply with MPE limits, then exposure regulations are satisfied, but link capacity and communication range are reduced

Engineering Contradiction:

ImproveMPE complianceVSAvoidlink capacity

Core Design Contradiction:

Object-affected harmful factorsVSProductivity

Solution Approach 1:

The patent implements dynamic beam pair selection where the UE can switch between different beam pairs based on real-time MPE conditions. When MPE constraints are detected on a primary beam pair, the system dynamically transitions to an alternative beam pair that does not violate MPE limits, thereby maintaining link capacity while ensuring regulatory compliance

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the operational parameters by introducing separate MPE indication fields in the PHR report and modifying the beam pair selection criteria. The system monitors MPE status and adjusts the selected beam pair accordingly, transforming the static power backoff approach into a dynamic parameter adjustment mechanism that preserves productivity

Inventive Principle:

Principle #35Parameter changes

2Object-affected harmful factors

If power backoff is applied to comply with MPE limits, then exposure regulations are satisfied, but communication range is reduced

Engineering Contradiction:

ImproveMPE complianceVSAvoidcommunication range

Core Design Contradiction:

Object-affected harmful factorsVSLength of stationary object

Solution Approach 1:

The system dynamically selects alternative beam pairs when MPE constraints are detected on the current beam pair. This dynamic switching allows the UE to maintain communication range by transitioning to a different spatial path that does not violate MPE limits, rather than being permanently constrained by the most restrictive MPE condition

Inventive Principle:

Principle #15Dynamics

3Device complexity

If PHR reporting uses the same beam pair link for which the report is calculated, then reporting simplicity is maintained, but MPE indication effectiveness is reduced

Engineering Contradiction:

ImprovePHR reporting simplicityVSAvoidMPE indication effectiveness

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent segments the PHR report structure by introducing separate fields for MPE indication and power headroom reporting. The MAC CE includes dedicated fields (e.g., `mpe-indication`, `phr-type`) that separately convey MPE status information, allowing the report to maintain structural simplicity while enhancing MPE indication effectiveness through specialized fields

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces an intermediary indication mechanism where the UE signals MPE status through specific fields in the PHR report (such as `mpe-indication` flags or separate MPE reporting MAC CE). This intermediary layer allows the network to understand MPE conditions without requiring fundamental changes to the overall PHR reporting structure, balancing simplicity with effectiveness

Inventive Principle:

Principle #24Intermediary (Mediator)

4Reliability

If multiple beam pair links are used in FR2 frequency range, then spatial diversity is improved, but MPE constraint management complexity increases

Engineering Contradiction:

Improvespatial diversityVSAvoidMPE constraint management

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent implements dynamic MPE monitoring across multiple beam pairs, where the UE continuously assesses MPE status for each configured beam pair and switches between them based on real-time conditions. This dynamic management approach handles the complexity of multiple beam pairs by automating the selection process based on MPE compliance rather than requiring manual configuration of each beam pair's MPE parameters

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS12507180B2On facilitating MPE indication in layer 2 PHR reporting

Publication Date: 2025.12.23 NOKIA TECHNOLOGIES OY

AI summary

Example embodiments of the invention as disclosed herein for at least a method performed by an apparatus for determining a power limiting state for a candidate uplink beam pair of at least one candidate uplink beam pair configured for a user equipment of a communication network; based at least on the determining, causing configuration of a different candidate uplink beam pair of the at least one candidate uplink beam pair for communicating towards the communication network; and based on the determining communicating at least one power headroom report for the candidate uplink beam pair based on the power limiting state.