Dynamic Frequency Band Selection for DSRC and Wi-Fi Interference

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Solution Overview

Problem

Existing communication systems between vehicles and infrastructure face interference issues due to shared frequency bands, particularly between Dedicated Short Range Communication (DSRC) and Wi-Fi, leading to reduced communication performance and increased packet error rates.

Innovation Solution

A communication apparatus and method that dynamically switch between frequency bands based on electric field intensity and usage rates, treating interfering signals as noise or subtracting them to optimize communication using either DSRC or Wi-Fi frequencies, thereby improving communication performance by minimizing interference.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If DSRC and Wi-Fi share the same frequency band for communication, then communication coverage and compatibility are improved, but interference between the two communication methods increases leading to reduced communication performance

Engineering Contradiction:

Improvecommunication compatibilityVSAvoidcommunication performance

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent implements dynamic frequency band selection where the communication apparatus switches between first and second frequency bands based on real-time usage rate detection. This dynamic adaptation allows the system to optimize communication performance by selecting less congested bands while maintaining compatibility with both DSRC and Wi-Fi standards.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the operating frequency parameter by selecting between first and second frequency bands based on usage rate conditions. When the usage rate of the first band exceeds a reference threshold, the system transitions to the second band, thereby adjusting the frequency parameter to minimize interference and improve communication reliability.

Inventive Principle:

Principle #35Parameter changes

2Productivity

If the communication apparatus uses the first frequency band for DSRC communication, then communication with other vehicles is enabled, but interference from Wi-Fi signals in the same band increases packet error rates

Engineering Contradiction:

Improvecommunication efficiencyVSAvoidinterference from Wi-Fi signals

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent introduces an intermediary frequency band selection mechanism that mediates between DSRC and Wi-Fi communications. By detecting usage rates and selecting appropriate frequency bands, the system acts as an intermediary that reduces direct interference between the two communication methods, thereby lowering packet error rates while maintaining communication efficiency.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent converts the potentially harmful interference from Wi-Fi signals into a beneficial frequency selection criterion. By detecting Wi-Fi usage rates and using this information to switch to alternative frequency bands when necessary, the system transforms the interference problem into a useful signal for optimizing communication performance.

Inventive Principle:

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

3Reliability

If the communication apparatus dynamically switches between frequency bands based on usage rates, then interference is reduced and communication reliability is improved, but system complexity increases

Engineering Contradiction:

Improvecommunication reliabilityVSAvoidfrequency band switching mechanism

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent implements a self-service frequency band selection mechanism where the communication apparatus autonomously monitors usage rates and switches bands without external intervention. This self-service approach reduces the need for complex centralized control systems while maintaining high communication reliability through automatic adaptation to changing spectral conditions.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The patent employs feedback mechanisms where the communication apparatus continuously monitors usage rates of frequency bands and uses this feedback to dynamically adjust its operating band. This feedback-driven approach enables reliable communication by constantly adapting to spectral conditions while keeping the control logic relatively simple through rule-based decision making.

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS12015970B2Communication apparatus, vehicle having the same and control method for controlling the vehicle

Publication Date: 2024.06.18 HYUNDAI MOTOR CO LTD

AI summary

A communication apparatus includes a band pass filter and a peak detector configured to detect a peak of a communication signal using a second communication protocol among the communication signals received by the antenna. A subtractor connected to the band pass filter and configured to subtract the communication signal using the second communication protocol from the communication signals received by the antenna. A switch is provided between the subtractor and the peak detector. A denoise filter configured to remove a noise from the communication signals received by the antenna, increase a sensitivity of a communication signal using a first communication protocol, and remove the communication signal using the second communication protocol among the communication signals received by the antenna by treating the communication signal using the second communication protocol as a noise.