Dynamic Frequency Selection via Narrowband Control Messages

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Solution Overview

Problem

Modern radio communication systems face inefficiencies in frequency channel selection, particularly in adaptive systems with numerous network nodes, leading to increased signaling overhead and poor adaptation to changing radio environments due to static frequency planning.

Innovation Solution

The implementation of a cognitive channel selection process using narrowband control messages with pilot sequences and identifiers, allowing network nodes to dynamically select and adapt to the best available frequency sub-bands for communication, reducing the need for manual frequency planning and excessive signaling.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If frequency planning is used to assign a given frequency band to the system, then the system can operate exclusively on that frequency band with stable performance, but the system cannot adapt to changing radio environments and has poor flexibility

Engineering Contradiction:

Improveadaptation to changing radio environmentsVSAvoidfrequency channel selection complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The system transitions from static frequency planning to dynamic frequency selection by continuously monitoring channel quality indicators (CQI) and adapting the operating frequency band in real-time based on current radio environment conditions, enabling the system to dynamically adjust to changing circumstances

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system implements feedback mechanisms where channel quality measurements are continuously reported back to the network controller, which then uses this information to make informed decisions about frequency band allocation and selection, creating a closed-loop adaptive system

Inventive Principle:

Principle #23Feedback

2Adaptability or versatility

If adaptive frequency selection is implemented by scanning for available frequencies, then the system can adapt to changing environments, but signaling overhead increases particularly in networks with numerous network nodes

Engineering Contradiction:

Improvefrequency selection adaptabilityVSAvoidsignaling overhead

Core Design Contradiction:

Adaptability or versatilityVSLoss of information

Solution Approach 1:

The frequency spectrum is divided into multiple frequency bands, and the system selectively monitors and reports only on relevant bands rather than scanning the entire spectrum, reducing the amount of signaling required while maintaining adaptive capability

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The same control message infrastructure is used for multiple purposes including frequency band negotiation, channel quality reporting, and system coordination, reducing the need for separate dedicated signaling channels and minimizing overall signaling overhead

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Reliability

If comprehensive channel scanning and negotiation is performed to ensure optimal frequency selection, then communication quality can be maximized, but the time required for channel selection increases

Engineering Contradiction:

Improvecommunication qualityVSAvoidchannel selection time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The system performs preliminary frequency band identification and basic channel quality assessment during initial system setup or idle periods, so that when data transmission is required, the selection process can proceed more quickly using pre-gathered information

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system performs scanning and evaluation on a selective basis, focusing resources on the most promising frequency bands identified by quick initial assessments rather than exhaustively scanning all possible bands, achieving good enough solutions faster than complete analysis would provide

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentEP2721760B1Channel selection in wireless communications

Publication Date: 2022.10.05 TELENOR MARITIME OY

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AI summary

This document discloses a solution for operating a radio communication apparatus that exchanges narrowband control messages with other radio communication apparatuses, each control message comprising a pilot sequence and an identifier identifying a transmitter of the control message. The radio communication apparatus receives a broadband signal through a broadband radio receiver and correlates sub-bands of the received signal so as to detect a narrowband control message within the received broadband signal. Upon detection of the narrowband control message on a sub-band of the received broadband signal, the transmitter of the narrowband control message is determined from the identifier of the narrowband control message. It is also determined from the reception of the narrowband control message on the sub-band that the sub-band is preferred by the transmitter of the narrowband control message, and said sub-band is utilized in data communication with the transmitter of the narrowband control message.