Analog Beamformed CIR Reporting for Accurate MU-MIMO Scheduling

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Solution Overview

Problem

Existing wireless communication systems face challenges in optimizing multiple user multiple-input-multiple-output (MU-MIMO) configurations due to the use of approximations in enhanced Type-II feedback, leading to increased recovery errors, data transfer latencies, and reduced throughput.

Innovation Solution

Implementing post-analog-beamformed channel impulse response (CIR) reporting to obtain precise channel matrix information by configuring UEs with specific analog receive beams for CIR reporting, enabling network nodes to select optimal MU-MIMO configurations and transmission parameters.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If enhanced Type-II feedback approximations are used for MU-MIMO configurations, then device complexity is reduced, but measurement precision and reliability deteriorate due to increased recovery errors

Engineering Contradiction:

Improvefeedback processing complexityVSAvoidchannel matrix accuracy

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The patent replaces the digital signal processing approach (enhanced Type-II feedback approximations) with an analog beamforming approach. By performing beamforming operations in the analog domain before digital processing, the system achieves higher channel matrix accuracy while reducing the complexity of digital feedback processing. The analog beamformed CIR measurements are obtained through analog beamforming networks that directly provide precise channel information without requiring complex digital approximations.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Device complexity

If enhanced Type-II feedback approximations are used, then device complexity is reduced, but productivity decreases due to increased data transfer latencies and reduced throughput

Engineering Contradiction:

Improvefeedback processing complexityVSAvoiddata throughput

Core Design Contradiction:

Device complexityVSProductivity

Solution Approach 1:

The patent substitutes digital feedback approximation methods with analog beamforming measurements. The analog beamformed channel impulse response provides accurate channel state information that enables optimal MU-MIMO configuration selection, thereby maximizing data throughput and reducing transfer latencies without requiring complex digital processing approximations.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Measurement precision

If analog beamformed CIR reporting is implemented, then measurement precision improves, but loss of information increases due to additional reporting requirements

Engineering Contradiction:

Improvechannel matrix accuracyVSAvoiduplink resource overhead

Core Design Contradiction:

Measurement precisionVSLoss of information

Solution Approach 1:

The patent extracts only the essential channel information needed for MU-MIMO configuration - specifically the analog beamformed channel impulse response - and reports this condensed information to the network. This extraction approach provides high measurement precision for channel matrix accuracy while minimizing uplink resource overhead by reporting only the most critical channel characteristics rather than complete channel state information.

Inventive Principle:

Principle #2Taking out (Extraction)

Data Source

PatentUS12633980B2Post-analog beamformed channel impulse response reporting for multiple user multiple-input-multiple-output scheduling and beamforming

Publication Date: 2026.05.19 QUALCOMM INC

AI summary

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive a first indication of a set of analog receive beams and an instruction to report one or more post-analog-beamformed channel impulse responses (CIRs) that are based at least in part on the set of analog receive beams. The UE may transmit a second indication of a CIR report that indicates the one or more post-analog-beamformed CIRs. Numerous other aspects are described.