Dual-Polarized Reference Signal Reception for Beam Selection

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Solution Overview

Problem

Existing beam management procedures in communications networks do not adequately consider the antenna architecture at the terminal device, leading to suboptimal beam selection due to polarization mismatches and inconsistent performance across different polarizations.

Innovation Solution

The terminal device employs a method for polarized reception of reference signals using a dual-polarized antenna array, receiving two reference signals in one OFDM symbol each with orthogonal polarizations to determine a common RSRP value, thereby accounting for antenna architecture and reducing polarization mismatch effects.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If traditional beam management procedures are used without considering antenna architecture, then the procedure is simple and fast, but beam selection accuracy deteriorates due to polarization mismatches

Engineering Contradiction:

Improvebeam selection accuracyVSAvoidbeam management procedure complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent applies preliminary action by having the terminal device receive reference signals with different polarizations before beam selection is made. The device determines RSRP values for multiple polarizations in advance, then uses this pre-collected polarization information to make an informed beam selection decision, thereby improving accuracy without adding complex real-time processing

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements feedback by having the terminal device report the determined common RSRP value and beam selection information back to the network node. This feedback loop allows the network to adjust future reference signal transmissions based on the terminal's polarization characteristics, continuously improving beam selection accuracy over time

Inventive Principle:

Principle #23Feedback

2Reliability

If reference signals are transmitted with single polarization, then transmission is simple, but reliability deteriorates due to polarization mismatch in different propagation conditions

Engineering Contradiction:

Improvebeam management reliabilityVSAvoidreference signal quantity

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The patent merges multiple polarization components into a single common RSRP value through combining operations. The terminal device receives reference signals with different polarizations, combines their RSRP values to determine a common RSRP, and uses this unified metric for beam selection, thereby improving reliability while managing the quantity of reference signals efficiently

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent applies universality by designing a beam management procedure that handles multiple polarizations using a unified approach. The same reference signal structure and measurement process are used for all polarizations, with the terminal device determining a common RSRP that is universally applicable for beam selection regardless of the specific polarization conditions

Inventive Principle:

Principle #6Universality (Multi-functionality)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This approach enhances beam management by improving beam selection accuracy and reliability, ensuring optimal beam choice regardless of polarization differences and environmental conditions.

Implementation Method 1

The terminal device is equipped with an antenna array having dual-polarized antenna elements... receiving two reference signals transmitted in one orthogonal frequency-division multiplexing (OFDM) symbol each from the same TRP port within a slot. The two reference signals are received using a filter with a first polarization for a first of the two reference signals and with a second polarization for a second of the two reference signals. The second polarization is orthogonal to the first polarization.

Methodology Applied

Scientific EffectPolarization: Polarisation

Data Source

PatentUS12413277B2Polarized reception of reference signals at a terminal device

Publication Date: 2025.09.09 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

AI summary

There is provided mechanisms for polarized reception of reference signals. A method is performed by a terminal device. The terminal device is equipped with an antenna array having dual-polarized antenna elements. The antenna array is connected to a baseband chain in the terminal device. The method comprises receiving, during a beam management procedure with a TRP, two reference signals transmitted in one OFDM symbol each from the same TRP port within a slot. The two reference signals are received using a filter with a first polarization for a first of the two reference signals and with a second polarization for a second of the two reference signals. The second polarization is orthogonal to the first polarization.