Multiband Antenna MIMO Switching by Frequency and Angular Spread

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Solution Overview

Problem

In wireless communication systems, the lack of information about the performance of multiple-input-multiple-output (MIMO) configurations at different carrier frequencies leads to suboptimal selection, resulting in increased data recovery errors, decreased throughput, and signaling overhead, especially when switching between frequency bands.

Innovation Solution

A multiband antenna module is used to transmit a first indication of a MIMO configuration threshold based on performance thresholds, enabling a network node to select an optimal MIMO configuration between polarization and spatial MIMO configurations, thereby improving signal quality and reducing signaling overhead.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If no MIMO configuration threshold indication is transmitted, then device complexity and signaling overhead are reduced, but MIMO configuration selection becomes suboptimal leading to increased data recovery errors and decreased throughput

Engineering Contradiction:

Improvedata recovery accuracyVSAvoidsignaling overhead

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The UE performs preliminary calculations of MIMO configuration thresholds based on carrier frequency and angular spread parameters before transmission. This threshold indication is prepared in advance and transmitted to the network node, enabling the network to make optimal MIMO configuration selections without requiring complex real-time calculations, thus resolving the contradiction between reliability and signaling overhead

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The UE transmits the calculated MIMO configuration threshold as feedback information to the network node. This feedback mechanism enables the network to select optimal MIMO configurations based on actual channel conditions characterized by angular spread and carrier frequency, improving data recovery accuracy while keeping signaling overhead manageable through efficient threshold-based communication

Inventive Principle:

Principle #23Feedback

2Productivity

If MIMO configuration threshold indication is transmitted, then optimal MIMO configuration selection is enabled improving throughput and reducing errors, but signaling overhead increases

Engineering Contradiction:

Improvedata throughputVSAvoidsignaling overhead

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The system changes the parameter used for MIMO configuration selection from complex real-time channel measurements to pre-calculated threshold values based on carrier frequency and angular spread. This parameter transformation enables the network to efficiently select optimal MIMO configurations that maximize data throughput while minimizing signaling overhead through simpler threshold-based communication

Inventive Principle:

Principle #35Parameter changes

3Use of energy by moving object

If polarization MIMO configuration is used, then spectral efficiency may improve, but data recovery errors increase when angular spread is large

Engineering Contradiction:

Improvespectral efficiencyVSAvoiddata recovery accuracy

Core Design Contradiction:

Use of energy by moving objectVSReliability

Solution Approach 1:

The system dynamically selects between polarization MIMO and spatial MIMO configurations based on the calculated angular spread threshold. When angular spread is small, polarization MIMO is selected for improved spectral efficiency. When angular spread is large, spatial MIMO is selected for improved data recovery accuracy. This dynamic adaptation resolves the contradiction by allowing the system to optimize for different channel conditions

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system uses angular spread as a key parameter to determine the optimal MIMO configuration. By calculating and comparing angular spread against predetermined thresholds, the system changes its operational mode between polarization and spatial MIMO, enabling optimal performance across varying channel conditions without fixed configuration limitations

Inventive Principle:

Principle #35Parameter changes

4Reliability

If spatial MIMO configuration is used, then data recovery accuracy may improve, but spectral efficiency decreases when angular spread is small

Engineering Contradiction:

Improvedata recovery accuracyVSAvoidspectral efficiency

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The system dynamically adapts the MIMO configuration based on real-time angular spread measurements. When angular spread is small indicating stable channel conditions, the system selects polarization MIMO for optimized spectral efficiency. When angular spread is large indicating multipath dominance, the system switches to spatial MIMO for improved data recovery accuracy. This dynamic selection resolves the spectral efficiency-accuracy tradeoff

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS12603680B2Switching between polarization and spatial multiple-input-multiple-output based on a multiband antenna

Publication Date: 2026.04.14 QUALCOMM INC

AI summary

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may transmit a first indication of a multiple-input-multiple-output (MIMO) configuration threshold that is associated with a selection between a polarization MIMO configuration and a spatial MIMO configuration, the MIMO configuration threshold being based at least in part on a performance threshold. The UE may receive a second indication of a MIMO communication configuration that specifies the selection. Numerous other aspects are described.