Adaptive Scanning Pattern for Electronic Toll Collection
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Solution Overview
Problem
Traditional electronic toll collection systems allocate fixed scanning time slots to antennas, leading to inefficiencies in traffic data collection and transaction processing, particularly in varying traffic conditions, as they do not dynamically adjust based on real-time traffic volume or transponder presence.
Innovation Solution
The system introduces an adaptive scanning pattern that dynamically allocates longer scanning time slots to antennas with higher traffic volumes or those currently processing transponders, allowing for real-time adjustments based on traffic conditions, either by extending existing slots or 'stealing' time from less busy antennas within a fixed cycle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If fixed scanning time slots are allocated to each antenna, then the system structure is simple and stable, but the system efficiency deteriorates under varying traffic conditions
Solution Approach 1:
The patent implements dynamic scanning patterns where the controller adjusts the scanning time allocated to each antenna based on real-time traffic conditions. The system transitions from fixed static time slots to dynamic time allocation, allowing antennas serving high-traffic lanes to receive more scanning time while maintaining system stability through controlled adaptation mechanisms.
2Productivity
If scanning time is increased for busy antennas, then transaction processing efficiency improves, but the overall cycle time increases
Solution Approach 1:
The patent applies local quality by allocating scanning resources non-uniformly across different antennas based on their specific traffic demands. Instead of increasing the total scanning cycle time for all antennas, the system concentrates additional scanning time specifically on antennas serving busy lanes, while reducing or maintaining standard time allocation for antennas serving lighter traffic, thereby improving local efficiency without proportionally increasing global cycle time.
3Adaptability or versatility
If the scanning pattern is made adaptive to traffic conditions, then the system becomes more versatile, but the control complexity increases
Solution Approach 1:
The patent implements feedback mechanisms where the controller continuously monitors traffic conditions at each antenna and adjusts scanning time allocation accordingly. The system uses real-time information about transponder presence and traffic volume to dynamically modify scanning patterns, creating a closed-loop control system that adapts to changing conditions while maintaining manageable complexity through systematic decision rules.
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
This approach enhances the efficiency of toll transactions and traffic data collection by ensuring that busy lanes receive adequate scanning time, reducing the number of cycles required for transactions and improving overall system performance under dynamic traffic conditions.
Implementation Method 1
a reader that adapts the scanning time allocated to specific antennas based upon the traffic conditions... The reader includes at least one transceiver for propagating an RF signal through the antennas and receiving RF response signals through the antennas
Data Source
AI summary
A method and system for adaptively allocating bandwidth in an electronic toll collection system. The system includes a reader that adapts the scanning time allocated to specific antennas based upon the traffic conditions. Those antennas that process a higher volume of traffic receive a greater allocation of the scanning time. In some embodiments, the determination as to when to allocate additional time to an antenna may be based upon whether or not a transponder is currently in the coverage zone for the antenna.