DSRC On-Board Unit Filtering for Multi-Beacon Reliability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing OBUs for DSRC communication with multiple beacons face reliability issues due to complex signal analysis and increased power consumption from processing unwanted frequencies, leading to unreliable and inefficient communication.
Innovation Solution
A method and OBU design that filters out unwanted frequencies and channels using downconversion and upconversion processes, allowing reliable communication with multiple beacons while reducing power consumption by blocking unnecessary frequencies and channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the OBU determines the strongest request signal to answer only in that channel, then transmitting power is reduced, but the device complexity increases due to complex signal analysis and hardware requirements
Solution Approach 1:
The patent segments the communication response into multiple channel components. Instead of selecting a single strongest channel, the OBU transmits the answer signal across all received channels simultaneously. This segmentation approach eliminates the need for complex signal analysis to determine the single best channel, reducing device complexity while maintaining reliable communication through multiple paths.
Solution Approach 2:
The patent changes the transmission parameter from single-channel selective transmission to multi-channel simultaneous transmission. By transmitting the answer signal on all received channels rather than analyzing and selecting the strongest one, the system reduces the computational complexity of signal analysis hardware while ensuring robust communication regardless of channel conditions.
2Device complexity
If the OBU indifferently modulates the answer onto all received carrier signals, then the hardware complexity is reduced, but unwanted signals from other channels are processed increasing power consumption
Solution Approach 1:
The patent extracts and processes only the relevant DSRC carrier signals while ignoring unwanted signals from other channels such as WLAN, Bluetooth, ZigBee, and Z-Wave. By selectively identifying and processing only the DSRC frequency range, the system maintains simple hardware architecture while avoiding the power consumption penalty of processing all received signals indiscriminately.
Solution Approach 2:
The patent applies local quality by treating different frequency ranges differently. The OBU is configured to process signals only within the specific DSRC frequency range, applying sophisticated processing only where needed (DSRC channels) while ignoring other frequency bands. This selective approach reduces power consumption compared to processing all signals while maintaining the simplicity of universal modulation capability.
3Device complexity
If the OBU processes all received signals without frequency filtering, then no signal analysis is needed, but channel crosstalk increases potentially impairing DSRC and adjoining channels
Solution Approach 1:
The patent extracts and isolates the DSRC frequency range from the broader spectrum of received signals. By applying frequency filtering to select only DSRC channels and exclude other communications, the system maintains simple modulation processing while eliminating channel crosstalk that would otherwise impair DSRC and adjoining channels. This extraction approach preserves signal processing simplicity while removing harmful interference.
Solution Approach 2:
The patent converts the potential harm of receiving multiple frequency signals into a benefit by using frequency filtering to extract only the useful DSRC signals. The presence of multiple signals, which could cause crosstalk, is transformed into an opportunity to demonstrate selective signal processing that eliminates interference while maintaining simple processing architecture. The filtering mechanism turns the challenging multi-signal environment into an advantage for reliable DSRC communication.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Ensures reliable communication with all beacons by filtering out unwanted frequencies, thereby reducing power consumption and minimizing crosstalk, ensuring consistent communication even when beacon strength changes.
Implementation Method 1
downconverting, by an input converter, the receive signal to obtain a downconverted signal
Implementation Method 2
upconverting, by an output converter, the response signal to obtain an upconverted signal
Implementation Method 3
filtering, by an input filter, all of said different channels out of the downconverted signal to obtain a filtered signal
Data Source
AI summary
A method for dedicated short-range communication, DSRC, of an on-board unit, OBU, with at least two beacons, each beacon using a different channel for transmitting a respective carrier signal, comprises: receiving a receive signal comprising the carrier signals of the beacons; downconverting the receive signal to obtain a downconverted signal; filtering all of said different channels out of the downconverted signal to obtain a filtered signal; modulating an OBU response onto the filtered signal to obtain a response signal; upconverting the response signal to obtain an upconverted signal; and transmitting the upconverted signal to the beacons. An OBU is configured to carry out a DSRC with at least two beacons.