Vehicle-Mounted Device Directional Information Filtering

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Solution Overview

Problem

Existing vehicle-mounted devices with DSRC technology face challenges in preventing unwanted information transmission due to electric wave leakage from unintended directions, especially on roads without specified traveling directions or where GPS/geographical information is absent, leading to incorrect information being provided to users.

Innovation Solution

An information distribution system comprising roadside apparatuses and vehicle-mounted devices that utilize first and second distribution information, where the vehicle-mounted device receives and stores information to execute content only if the division number and valid term match, ensuring information is provided based on the correct traveling direction.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If electric wave absorbers are installed to prevent leakage, then electric wave leakage is reduced, but installation space is required which is not available on all roads

Engineering Contradiction:

Improveelectric wave leakageVSAvoidinstallation space

Core Design Contradiction:

Object-affected harmful factorsVSArea of stationary object

Solution Approach 1:

The patent introduces an intermediary verification mechanism (division number matching) between the roadside apparatus and vehicle-mounted device. The roadside apparatus transmits its identification information, and the vehicle-mounted device verifies this information against stored data to determine if the received electric waves are from the intended direction, eliminating the need for physical barriers.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent replaces the mechanical/physical approach of electric wave absorbers with an information-based verification system. Instead of physically blocking or absorbing electric waves, the system uses data transmission and logical verification to identify and filter waves from unintended directions.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Object-affected harmful factors

If electric wave absorbers are used to prevent leakage, then unwanted information reception is reduced, but the system complexity increases

Engineering Contradiction:

Improveunwanted information receptionVSAvoidsystem complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The vehicle-mounted device performs self-verification by comparing received division numbers with pre-stored information. The system uses its own stored data to verify the authenticity of received signals, eliminating the need for external verification infrastructure or complex centralized control systems.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The patent changes the verification parameter from physical characteristics of electric waves to information-based parameters (division numbers). This allows for simple digital comparison and verification without requiring complex signal analysis or physical measurement systems.

Inventive Principle:

Principle #35Parameter changes

3Adaptability or versatility

If the vehicle-mounted device receives information from all directions, then information coverage is improved, but incorrect information is provided to users due to leakage

Engineering Contradiction:

Improveinformation coverageVSAvoidinformation accuracy

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent applies local quality by making the verification requirement specific to each roadside apparatus's division number. Each roadside apparatus has its unique identification information that must match what is stored in the vehicle-mounted device, allowing the system to accept information from multiple sources while verifying each one's authenticity.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The system uses feedback by comparing the received division number against pre-stored information and making execution decisions based on this comparison. The control unit determines whether to execute the received information based on the verification result, creating a closed-loop verification system.

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS8279085B2Vehicle-mounted device and information distribution system

Publication Date: 2012.10.02 JVC KENWOOD CORP

AI summary

An information distribution system comprises a roadside apparatus, a center apparatus, and a vehicle-mounted device. The center apparatus transmits to a predetermined area through the roadside apparatus first distribution information including a predetermined division number for identifying a road where the roadside apparatus are installed or second distribution information including speech information, a division number, and execution condition information for executing the speech information depending on the division number included in the first distribution information and that included in the second one. The vehicle-mounted device has a DSRC unit for receiving the first or second distribution information, a storage unit for storing the first or second distribution information, a reproduction unit for executing the speech information, and a control unit for judging on the basis of the execution condition information whether or not it is possible to execute the speech information and allowing the reproduction unit to execute the speech information depending on the result of the judgment. Provision of erroneous information due to leakage of a radio wave arriving from a direction different from the moving direction of the vehicle equipped with the vehicle-mounted device is prevented, and information corresponding to the moving direction of the vehicle.