Dynamic Spectrum Access Interference Avoidance

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Solution Overview

Problem

Existing wireless communication systems fail to effectively avoid interference between nodes and other spectrum users, particularly in dynamic environments where frequency or channel hopping is not adaptive and lacks local and distributed spectrum awareness.

Innovation Solution

Nodes in the system observe spectrum activity to determine optimal frequencies for communication, selecting channels based on maximum transmit power and notifying other nodes through an adaptive control channel, allowing for autonomous operation and minimal interference.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If static frequency allocation is used, then system simplicity is maintained, but interference between nodes and other spectrum users increases

Engineering Contradiction:

Improvesystem simplicityVSAvoidinterference between nodes and other spectrum users

Core Design Contradiction:

Device complexityVSObject-affected harmful factors

Solution Approach 1:

The system dynamically selects frequencies and adjusts transmit power based on real-time spectrum awareness data, transforming the static frequency allocation into a dynamic adaptation process that avoids interference while maintaining operational simplicity through automated decision-making

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

Each node autonomously determines its own frequency and power settings by observing spectrum activity and calculating maximum transmit power, eliminating the need for centralized control while reducing interference through self-optimized spectrum usage

Inventive Principle:

Principle #25Self-service

2Object-affected harmful factors

If frequency hopping is implemented without adaptive control, then some interference avoidance is achieved, but spectrum utilization efficiency deteriorates

Engineering Contradiction:

Improveinterference avoidanceVSAvoidspectrum utilization efficiency

Core Design Contradiction:

Object-affected harmful factorsVSProductivity

Solution Approach 1:

The system continuously monitors spectrum activity and uses this feedback to dynamically adjust frequency selection and transmit power, ensuring both interference avoidance and optimal spectrum utilization through real-time adaptation to changing spectral conditions

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The system changes multiple parameters simultaneously including frequency, transmit power, and dwell time based on spectrum awareness, allowing flexible adaptation that maximizes spectrum utilization while maintaining interference avoidance

Inventive Principle:

Principle #35Parameter changes

3Adaptability or versatility

If autonomous spectrum access is implemented, then adaptability to changing spectrum conditions improves, but system complexity increases

Engineering Contradiction:

Improveadaptability to changing spectrum conditionsVSAvoidsystem complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

Each node independently performs spectrum sensing, calculates maximum transmit power, selects frequencies, and manages bearers autonomously, achieving high adaptability to changing spectrum conditions while avoiding the complexity of centralized control systems

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The system pre-calculates maximum transmit power based on observed spectrum activity before actual transmission, allowing rapid adaptation to changing conditions without real-time computational complexity during active communication

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS8289907B2Interference avoidance for autonomous dynamic spectrum access systems

Publication Date: 2012.10.16 POWERWAVE COGNITION INC

AI summary

Communicating between a plurality of nodes includes scanning a set of frequencies to determine spectrum awareness data for one or more frequencies; determining a maximum transmit power for one or more of the frequencies based at least in part on the spectrum awareness data for the frequencies; determining one or more channels, each channel occupying at least a portion of the set of frequencies; and selecting one or more of the one or more channels as a bearer.