MU-MIMO Beamforming for 5G Mid-Band Spectrum Efficiency

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Solution Overview

Problem

Existing 5G communication systems face inefficiencies in spectrum usage due to the overhead required for carrier aggregation, which reduces throughput and spectrum efficiency, especially in mid-band TDD carriers like n77.

Innovation Solution

Disabling carrier aggregation in 5G mid-band TDD carriers and activating multi-user multiple input, multiple output (MU-MIMO) communications, which utilizes beamforming to reuse the entire spectrum among multiple concurrent users.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If carrier aggregation is used to increase peak throughput, then the peak throughput of a single user increases, but spectrum efficiency deteriorates due to overhead

Engineering Contradiction:

Improvepeak throughputVSAvoidspectrum efficiency

Core Design Contradiction:

ProductivityVSLoss of energy

Solution Approach 1:

The system dynamically switches between carrier aggregation and MU-MIMO modes based on the number of active users in the cell. When multiple users are detected, the system transitions from carrier aggregation to MU-MIMO, adapting the communication mode to current network conditions to optimize both throughput and spectrum efficiency

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system changes the operational parameters by disabling carrier aggregation and enabling MU-MIMO communications when multiple users are present. This parameter change transforms the system from a single-user optimized mode to a multi-user optimized mode, improving spectrum efficiency while maintaining throughput through beamforming

Inventive Principle:

Principle #35Parameter changes

2Quantity of substance

If carrier aggregation is deployed to meet application demand, then bandwidth capacity increases, but overhead reduces spectrum efficiency

Engineering Contradiction:

Improvebandwidth capacityVSAvoidspectrum efficiency

Core Design Contradiction:

Quantity of substanceVSLoss of energy

Solution Approach 1:

The system dynamically adjusts bandwidth utilization by switching from carrier aggregation to MU-MIMO based on user presence. This dynamic adaptation allows the system to maintain sufficient bandwidth capacity for multiple users while eliminating the overhead associated with carrier aggregation, thereby improving spectrum efficiency

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system replaces the carrier aggregation mechanism with MU-MIMO beamforming technology. This substitution eliminates the need for multiple aggregated carriers and their associated overhead, achieving the same bandwidth capacity goal through spatial multiplexing and directional beamforming

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Productivity

If carrier aggregation is used to increase throughput, then data rate improves, but processing load and energy consumption increase

Engineering Contradiction:

Improvedata rateVSAvoidprocessing load

Core Design Contradiction:

ProductivityVSUse of energy by moving object

Solution Approach 1:

The system dynamically transitions from carrier aggregation to MU-MIMO processing when multiple users are detected. This dynamic switching reduces processing load by eliminating the complex carrier aggregation management while maintaining high data rates through MU-MIMO beamforming capabilities

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system replaces carrier aggregation processing with MU-MIMO beamforming processing. This substitution reduces the processing burden on network infrastructure by using spatial multiplexing and directional transmission instead of managing multiple aggregated carriers, thereby lowering energy consumption while maintaining throughput

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 significantly increases downlink and uplink throughput, improving spectrum efficiency and average throughput per user, while reducing processing load and energy consumption.

Implementation Method 1

activating multi-user multiple input, multiple output (MU-MIMO) communications, which utilizes beamforming to reuse the entire spectrum among multiple concurrent users

Methodology Applied

Scientific EffectBeamforming:

Data Source

PatentUS20250125938A1Multi-user multiple input, multiple output for fifth generation and beyond fifth generation communications

Publication Date: 2025.04.17 AT&T INTELLECTUAL PROPERTY I L P

AI summary

A method performed by a processing system including at least one processor includes detecting a presence of a plurality of user devices in a cell of a mobile network that deploys a carrier that supports beamforming, disabling, in response to the detecting the presence of the plurality of user devices, carrier aggregation in the cell for a first subset of the plurality of user devices that supports multi-user multiple input, multiple output communications, and activating, after disabling the carrier aggregation, multi user multiple input, multiple output communications for the first subset of the plurality of user devices.