Wireless Roadside Device Adaptive Transmission Control

Solution Overview

Problem

In existing traffic communication systems, wireless roadside devices cyclically transmit roadside-to-vehicle messages even when no in-vehicle communication devices are present, leading to wastage of radio resources and increased power consumption.

Innovation Solution

The implementation of a wireless roadside device with a controller that performs inhibition control, inhibiting the cyclic transmission of roadside-to-vehicle messages when no vehicle information message is received from in-vehicle communication devices, thereby optimizing radio resource utilization and reducing power consumption.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the wireless roadside device cyclically transmits roadside-to-vehicle messages continuously, then the communication reliability is improved, but the radio resource waste increases and power consumption increases

Engineering Contradiction:

Improvecommunication reliabilityVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

The patent applies periodic action by transitioning from continuous cyclic transmission to conditional periodic transmission. The roadside device transmits messages periodically based on detected vehicle presence rather than continuously, achieving energy savings while maintaining communication reliability when vehicles are detected in the coverage area.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The patent implements feedback mechanisms where the wireless roadside device detects vehicle information messages from in-vehicle communication devices and uses this feedback to control transmission behavior. When vehicles are detected, the device activates cyclic transmission; when no vehicles are present, transmission is inhibited, thereby optimizing the balance between reliability and energy consumption.

Inventive Principle:

Principle #23Feedback

2Reliability

If the wireless roadside device cyclically transmits roadside-to-vehicle messages continuously, then the communication reliability is improved, but the radio resource waste increases

Engineering Contradiction:

Improvecommunication reliabilityVSAvoidradio resource waste

Core Design Contradiction:

ReliabilityVSLoss of substance

Solution Approach 1:

The patent applies periodic action by transitioning from continuous cyclic transmission to conditional periodic transmission. The roadside device transmits messages periodically based on detected vehicle presence rather than continuously, achieving energy savings while maintaining communication reliability when vehicles are detected in the coverage area.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The patent implements feedback mechanisms where the wireless roadside device detects vehicle information messages from in-vehicle communication devices and uses this feedback to control transmission behavior. When vehicles are detected, the device activates cyclic transmission; when no vehicles are present, transmission is inhibited, thereby optimizing the balance between reliability and energy consumption.

Inventive Principle:

Principle #23Feedback

3Loss of energy

If the wireless roadside device inhibits cyclic transmission when no vehicles are detected, then the power consumption is reduced and radio resource waste is reduced, but the communication reliability may deteriorate

Engineering Contradiction:

Improvepower consumptionVSAvoidcommunication reliability

Core Design Contradiction:

Loss of energyVSReliability

Solution Approach 1:

The patent implements feedback mechanisms where the wireless roadside device detects vehicle information messages from in-vehicle communication devices and uses this feedback to control transmission behavior. When vehicles are detected, the device activates cyclic transmission; when no vehicles are present, transmission is inhibited, thereby optimizing the balance between reliability and energy consumption.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent applies dynamics by making the transmission behavior adaptive and flexible rather than fixed. The roadside device dynamically adjusts its transmission state based on real-time detection of vehicle presence, transitioning between active cyclic transmission and inhibited state as needed, thereby optimizing both energy efficiency and communication reliability under varying conditions.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS12293662B2Wireless roadside device, traffic communication system, and traffic communication method

Publication Date: 2025.05.06 KYOCERA CORP

AI summary

A wireless roadside device that performs roadside-to-vehicle communication with an in-vehicle communication device in a traffic communication system includes a roadside-to-vehicle communicator that cyclically transmits a roadside-to-vehicle message, and a controller that performs inhibition control to inhibit cyclic transmission of the roadside-to-vehicle message when the roadside-to-vehicle communicator receives no vehicle information message from the in-vehicle communication device.