Radio Transceiver Beam Management Using Frequency-Dependent Polarization

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Solution Overview

Problem

Current beam management in communications networks is inefficient, particularly at high frequencies, as it is sensitive to polarization mismatch and can result in suboptimal beam selection due to the use of single-port CSI-RS resources, which are faster but less reliable than dual-port resources.

Innovation Solution

Implementing a method where a reference signal with frequency-dependent polarization is transmitted over a frequency interval in the transmission beam, allowing for frequency diversity and improved beam selection during beam management.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If single-port CSI-RS resources are used for beam management, then beam sweeping speed is improved, but polarization mismatch reliability deteriorates

Engineering Contradiction:

Improvebeam sweeping speedVSAvoidpolarization mismatch reliability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent changes the parameter of polarization by transmitting reference signals with different polarizations across different frequency subbands. This allows the system to maintain fast beam sweeping (single-port CSI-RS) while improving reliability by selecting subbands where polarization mismatch is minimized, thus resolving the contradiction between speed and reliability.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent segments the frequency band into multiple subbands, each potentially having different polarization characteristics. By evaluating reference signal quality across these segmented subbands and selecting the best one, the system achieves both fast beam sweeping and reliable polarization-matched communication.

Inventive Principle:

Principle #1Segmentation

2Reliability

If dual-port CSI-RS resources are used for beam management, then polarization reliability is improved, but beam sweeping speed deteriorates

Engineering Contradiction:

Improvepolarization reliabilityVSAvoidbeam sweeping speed

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

Instead of using dual-port CSI-RS which transmits on both polarizations simultaneously, the patent changes the approach by using single-port CSI-RS across multiple frequency subbands with different polarizations. This maintains the speed advantage while achieving polarization diversity through frequency segmentation.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent moves from a spatial dimension approach (dual-port simultaneous transmission) to a frequency dimension approach (single-port transmission across multiple subbands). This dimensional change allows the system to achieve polarization reliability without sacrificing beam sweeping speed.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Loss of time

If CSI-RS is transmitted over one polarization only, then beam sweeping time is reduced, but beam selection accuracy deteriorates

Engineering Contradiction:

Improvebeam sweeping timeVSAvoidbeam selection accuracy

Core Design Contradiction:

Loss of timeVSMeasurement precision

Solution Approach 1:

The patent segments the frequency band into multiple subbands, each transmitted on a single polarization. This segmentation allows fast beam sweeping per subband while improving overall beam selection accuracy by comparing results across multiple polarized subbands and selecting the best combination.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent changes the frequency parameter by transmitting reference signals across multiple frequency subbands with different polarizations. This allows the system to maintain reduced beam sweeping time (single-port per subband) while improving beam selection accuracy through multi-subband evaluation.

Inventive Principle:

Principle #35Parameter changes

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 reduces the sensitivity to polarization mismatch, leading to more reliable and efficient beam selection and performance in communications networks, especially at high frequencies.

Implementation Method 1

The reference signal in the transmission beam occupies time/frequency resources that extend over a frequency interval. The transmission beam has a frequency-dependent polarization over the frequency interval.

Methodology Applied

Scientific EffectFrequency-dependent polarization: Polarisation

Data Source

PatentUS11271696B2Beam management of a radio transceiver device

Publication Date: 2022.03.08 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

AI summary

There is provided mechanisms for performing beam management. A method is performed by a radio transceiver device. The method comprises transmitting a reference signal in a transmission beam as part of the beam 5 management. The reference signal in the transmission beam occupies time/frequency resources that extend over a frequency interval. The transmission beam has a frequency-dependent polarization over the frequency interval.