Cellular Beamforming Null Steering for Interference-Resilient Handover

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Solution Overview

Problem

Mobile devices, particularly drones, experience interference from various sources, including co-channel interference and intentional jamming, which degrade signal quality and disrupt handover processes in cellular networks.

Innovation Solution

A system and method for mitigating interference by computing weights for a composite beam pattern that steers beams towards serving and handover base stations while forming nulls towards interference sources, using fewer antennas than traditional methods, and employing periodic weight updates for dynamic environments.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If traditional interference mitigation methods are used, then interference reduction is achieved, but device complexity and number of antennas increase

Engineering Contradiction:

ImproveinterferenceVSAvoidantenna configuration

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The patent applies parameter changes by dynamically adjusting beamforming weights and null-steering parameters based on real-time interference detection. The system modifies antenna weight vectors and beam direction parameters to adaptively mitigate interference from base stations without requiring additional physical antennas, thus reducing device complexity while maintaining interference reduction effectiveness

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The system implements dynamics by continuously updating beamforming configurations in response to changing network conditions. The mobile device dynamically identifies serving and handover base stations, adjusts beam directions, and repositions nulls toward interfering transmitters. This dynamic adaptation allows effective interference mitigation with a fixed, simplified antenna array rather than requiring complex static multi-antenna configurations

Inventive Principle:

Principle #15Dynamics

2Reliability

If beamforming is used to steer beams towards base stations, then signal quality improves, but interference from other base stations increases

Engineering Contradiction:

Improvesignal qualityVSAvoidinterference

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent applies segmentation by dividing the beamforming function into two independent components: signal-enhancing beams steered toward desired base stations and interference-suppressing nulls steered toward interfering base stations. This segmentation allows the system to simultaneously optimize for signal quality and interference reduction by independently controlling the weight vectors for constructive and destructive interference patterns

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The system converts harmful interference into beneficial null-steering opportunities. By detecting interfering base stations and intentionally directing nulls toward them, the system transforms what would be harmful interference into a controlled spatial filtering effect. The nulls are positioned to reject signals from interfering transmitters while preserving desired signals, effectively converting interference information into useful spatial selectivity

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Reliability

If handover preparation includes identifying multiple base stations, then handover stability improves, but processing time increases

Engineering Contradiction:

Improvehandover stabilityVSAvoidprocessing time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent applies preliminary action by continuously identifying and monitoring serving base stations, handover candidate base stations, and interfering base stations in advance of actual handover events. The system pre-computes beamforming weights and null positions for anticipated handover scenarios, so that when handover is needed, the mobile device can quickly adjust existing configurations rather than performing complex real-time calculations, thus reducing processing time while maintaining handover stability

Inventive Principle:

Principle #10Preliminary action

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

Enhances signal-to-interference and noise ratio (SINR) for mobile devices, reduces interference, and maintains stable handovers, even in dynamic conditions, with a simpler and more efficient antenna configuration.

Implementation Method 1

computing a set of weights for generating by a plurality of antennas associated with the mobile device, a composite beam pattern that includes beams steered towards the serving base station and for the at least one handover base station, and that forms null towards at least one interference source

Methodology Applied

Scientific EffectBeamforming:

Implementation Method 2

a composite beam pattern that includes beams steered towards the serving base station

Methodology Applied

Scientific EffectElectromagnetic radiation:

Data Source

PatentUS20260082291A1Cellular user immunity

Publication Date: 2026.03.19 UBIQAM

AI summary

There is provided an apparatus for mitigating foreign interference of a mobile device, comprising: a processor executing a code for: identifying a serving base station that is serving the mobile device, identifying at least one handover base station that the mobile device is likely to handover to, and computing a set of weights for generating by a plurality of antennas associated with the mobile device, a composite beam pattern that includes beams steered towards the serving base station and for the at least one handover base station, and that forms null towards at least one interference source.