Cognitive Beamforming for Non-Exclusive Primary-Secondary Spectrum Sharing

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Solution Overview

Problem

Existing wireless networks face challenges in efficiently sharing spectrum resources without mutual temporal exclusion, requiring significant modifications to protocol stacks and coordination among different technologies, which is impractical and inefficient.

Innovation Solution

A cognitive beamforming approach that uses a multi-antenna secondary transmitter to eavesdrop on primary user transmissions, determine beamforming schemes, and implement beamforming-based transmissions to minimize interference, allowing simultaneous access to the same spectrum without modifying existing networks.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If cognitive beamforming is implemented by secondary network, then spectrum utilization is improved and interference to primary network is minimized, but device complexity increases due to multi-antenna requirements and beamforming processing

Engineering Contradiction:

Improvespectrum utilizationVSAvoiddevice complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent transitions from temporal domain separation to spatial domain multiplexing by introducing multi-antenna beamforming. The secondary network uses multiple antennas to create directional beams that spatially separate transmissions, allowing simultaneous spectrum access without temporal exclusion while managing complexity through spatial processing techniques.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The patent changes the operational parameters of the wireless system by introducing beamforming weights and phase shifts as controllable parameters. By adjusting these parameters dynamically, the system optimizes spectrum utilization and minimizes interference to primary networks while managing the complexity through parameter optimization rather than structural changes.

Inventive Principle:

Principle #35Parameter changes

2Productivity

If beamforming-based transmissions are implemented without mutual temporal exclusion, then spectrum sharing efficiency is improved, but interference management becomes more challenging

Engineering Contradiction:

Improvespectrum sharing efficiencyVSAvoidinterference

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent applies local quality by creating spatially selective transmission characteristics through beamforming. Different directional beams are formed toward different secondary users, allowing localized signal delivery that minimizes interference to primary networks in other spatial directions while maintaining high spectrum sharing efficiency.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent implements feedback mechanisms where the secondary network monitors interference levels and channel conditions, then dynamically adjusts beamforming weights and transmission parameters. This closed-loop control enables the system to maintain high spectrum sharing efficiency while actively managing interference to primary networks through real-time parameter adaptation.

Inventive Principle:

Principle #23Feedback

3Adaptability or versatility

If cognitive beamforming is used for spectrum sharing, then coexistence of heterogeneous networks is improved, but processing requirements and computational load increase

Engineering Contradiction:

Improvecoexistence capabilityVSAvoidprocessing requirements

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent applies preliminary action by performing channel estimation and beamforming parameter calculation in advance before actual data transmission. The secondary network pre-computes beamforming weights based on channel state information, reducing real-time processing requirements and enabling efficient coexistence of heterogeneous networks with reduced computational burden during active transmission.

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

Enables efficient spectrum sharing among heterogeneous wireless networks with minimal interference, ensuring fair coexistence and high spectrum utilization without cross-technology signaling or protocol modifications.

Implementation Method 1

a newly-deployed wireless network can access a spectrum band based on cognitive beamforming without mutual temporal exclusion

Methodology Applied

Scientific EffectBeamforming:

Implementation Method 2

The technology can leverage beamforming techniques and spatial diversity to enable multiple co-located wireless systems to access the same portion of the spectrum simultaneously

Methodology Applied

Scientific EffectSpatial diversity:

Data Source

PatentUS12408042B2Method for spectrum sharing by primary and secondary networks based on cognitive beamforming

Publication Date: 2025.09.02 NORTHEASTERN UNIV (US)

AI summary

Method and systems of sharing a frequency spectrum between a primary wireless network and a secondary wireless network coexisting with the primary wireless network are provided. At a node of the secondary network, at a bottom of a protocol stack integrated between a plurality of antennas and upper layers of the protocol stack, a beamforming scheme is determined for transmission to scheduled users of the secondary network. Using this technology, a newly-deployed wireless network can access a spectrum band based on cognitive beamforming without mutual temporal exclusion. i.e., without interrupting the ongoing transmissions of coexisting wireless networks on the same bands, and without cross-technology communication.