Massive MIMO Beamforming With Interference Mitigation for O-RAN

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Solution Overview

Problem

Existing wireless communication systems face challenges in efficiently managing interference and beamforming in massive MIMO uplink and downlink operations within O-RAN 7-2 compatible base stations, particularly in unlicensed and licensed spectrum environments, which affect network performance and connectivity.

Innovation Solution

Implementing beamforming and interference mitigation techniques using a discrete Fourier transform (DFT) codeword-based grid-of-beams (GoB) for physical downlink shared channel (PDSCH) in O-RAN base stations to enhance signal processing and reduce interference.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If beamforming techniques are implemented in massive MIMO systems, then network throughput and coverage are improved, but interference management complexity increases

Engineering Contradiction:

Improvenetwork throughputVSAvoidinterference management complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent segments the beamforming process into distinct stages: channel estimation, beam selection, precoding matrix application, and interference mitigation. By dividing the complex beamforming operation into manageable segments, the system achieves high throughput while reducing overall management complexity through modular processing.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent performs preliminary channel estimation and beam selection before actual data transmission. By pre-determining the optimal beams and precoding matrices based on channel conditions, the system prepares interference mitigation strategies in advance, reducing real-time complexity during high-throughput operations.

Inventive Principle:

Principle #10Preliminary action

2Reliability

If interference mitigation techniques are applied in massive MIMO, then network performance is improved, but processing time increases

Engineering Contradiction:

Improvenetwork performanceVSAvoidprocessing time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent implements continuous channel estimation and adaptive beam tracking that operates continuously during transmission. This continuous action allows the system to maintain high network performance through real-time interference mitigation without requiring periodic interruptions for recalibration, thus minimizing processing time losses.

Inventive Principle:

Principle #20Continuity of useful action

Solution Approach 2:

The system employs self-service mechanisms where the beamforming and interference mitigation algorithms automatically adapt to changing channel conditions without external intervention. The precoding matrices are self-adjusted based on feedback from channel state information, reducing the need for manual reconfiguration and minimizing processing delays.

Inventive Principle:

Principle #25Self-service

3Measurement precision

If DFT codeword-based grid-of-beams is used for PDSCH, then beamforming precision is improved, but computational complexity increases

Engineering Contradiction:

Improvebeamforming precisionVSAvoidcomputational complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent utilizes DFT codewords with specific parameter configurations (root indices, length, and scaling factors) to generate the grid-of-beams structure. By carefully selecting these parameters, the system achieves precise beamforming with reduced computational complexity compared to exhaustive beam searching, as the DFT-based approach provides a structured, mathematically efficient method for beam generation.

Inventive Principle:

Principle #35Parameter changes

4Adaptability or versatility

If massive MIMO operations are performed in unlicensed spectrum, then connectivity is improved, but interference from other systems increases

Engineering Contradiction:

ImproveconnectivityVSAvoidinterference from other systems

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The patent introduces channel state information and beam management protocols as intermediaries between the massive MIMO system and the unlicensed spectrum environment. These intermediaries enable the system to sense, adapt to, and mitigate interference from other systems (such as Wi-Fi) while maintaining improved connectivity, by mediating the interaction between different wireless technologies sharing the same spectrum.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS12512886B2Beamforming and interference mitigation techniques for massive MIMO uplink and downlink in O-RAN 7-2 compatible base stations

Publication Date: 2025.12.30 INTEL CORP

AI summary

An apparatus for use in an O-RAN base station includes processing circuitry. To configure the O-RAN base station for signal processing in an O-RAN network, the processing circuitry is to decode an SRS and a DMRS in a UL stream received from at least one UE. Channel estimation is performed based on the SRS to obtain a channel estimate matrix of channel estimates associated with reception of the UL stream. A noise covariance is generated using the DMRS. Beamforming weights are determined using the channel estimate matrix and the noise covariance. Beamforming is performed on UL data corresponding to the UL stream to generate beamformed data streams. The beamforming is based on applying the beamforming weights to the UL data.