Radio Beacon Listen-Before-Talk for 5.8 and 5.9 GHz DSRC Interference

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Solution Overview

Problem

Radio beacons operating at 5.8 GHz and 5.9 GHz DSRC standards experience mutual interferences due to the close vicinity of transceivers and overlapping radio coverage areas, affecting communication with onboard units.

Innovation Solution

Implementing a 'listen-before-talk' function by delaying the transmission of 5.8 GHz DSRC data packets when 5.9 GHz DSRC data packets are detected, and vice versa, to prevent collisions and interferences between the two frequency bands.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a hybrid radio beacon uses both 5.8 GHz and 5.9 GHz transceivers to communicate with different onboard units, then the beacon can support multiple DSRC standards and frequency bands, but mutual interferences and collisions occur between the transceivers due to their close vicinity and overlapping coverage areas

Engineering Contradiction:

Improvesupport for multiple DSRC standardsVSAvoidmutual interference between transceivers

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The patent implements a listen-before-talk mechanism where the 5.8 GHz transceiver monitors the 5.9 GHz frequency band before transmitting data packets. When a 5.9 GHz data packet is detected, the 5.8 GHz transceiver delays its transmission to avoid collision. This preliminary monitoring and conditional delaying action prevents interference before it occurs, allowing the hybrid beacon to support multiple standards while avoiding mutual interference between transceivers

Inventive Principle:

Principle #10Preliminary action

2Productivity

If the 5.8 GHz transceiver transmits data packets at regular intervals, then efficient communication is maintained with 5.8 GHz onboard units, but data packet collisions occur when 5.9 GHz transmissions are taking place

Engineering Contradiction:

Improvecommunication efficiencyVSAvoiddata packet collision avoidance

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent employs a feedback mechanism where the 5.8 GHz transceiver continuously monitors the 5.9 GHz band for incoming data packets. Based on this feedback information, the transceiver dynamically adjusts its transmission timing by introducing delays when 5.9 GHz packets are detected. This feedback-based adaptive timing prevents collisions while maintaining efficient communication, as the system responds to real-time channel conditions rather than following a fixed schedule

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS8983382B2Radio beacon and method for selectively communicating in accordance with 5.8 and 5.9 GHz DSRC standards

Publication Date: 2015.03.17 KAPSCH TRAFFICCOM AG

AI summary

A radio beacon and a method for selective radio communication with a first onboard unit and a second onboard unit, in which a sequence of first data packet is transmitted to the first onboard unit in a first frequency band in accordance with 5.8 GHz DSRC standards, a sequence of second data packet is transmitted or received to/from the second onboard unit in accordance with 5.9 GHz DSRC standards, wherein the transmission of a data packet of the sequence of first data packet is delayed by the duration of the second data packet if the second data packet appears in the second frequency band.