Traffic Preemption Optical Communication Security
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Solution Overview
Problem
Existing traffic light control systems face challenges in securely allowing emergency and mass transit vehicles to preempt traffic signals, as current optical priority systems can be vulnerable to unauthorized access and require costly equipment upgrades.
Innovation Solution
A remotely controlled traffic preemption system using high-integrity data communication via optically encoded data, employing amplitude and frequency modulation of light pulses to securely transmit vehicle identification codes and commands to traffic light controllers, ensuring only authorized vehicles can activate preemption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fixed code embedding with security measures is used, then unauthorized access can be restricted, but the system becomes vulnerable to code interception and replay attacks
Solution Approach 1:
The patent applies dynamics by transitioning from static fixed codes to dynamic challenge-response authentication. The system generates unique challenges that change with each communication session, and the vehicle must respond with the correct code combination. This dynamic approach prevents replay attacks because recorded transmissions become invalid after their challenge has been used once.
Solution Approach 2:
The patent implements feedback through a challenge-response mechanism where the traffic light controller sends challenges to the vehicle, and the vehicle responds with codes. The controller validates these responses and provides feedback about authorization status. This feedback loop ensures that only authorized vehicles can access the system while preventing interception and replay attacks through continuous verification.
2Reliability
If special communication transceivers are installed on all vehicles and intersections, then unauthorized access is prevented, but equipment complexity and cost increase
Solution Approach 1:
The patent extracts the complex authentication logic from dedicated hardware transceivers and implements it through software-based challenge-response mechanisms. Instead of requiring special hardware on both vehicles and intersections, the system uses standard optical communication with intelligent software that handles security through challenge-response protocols, thereby reducing device complexity while maintaining security.
Solution Approach 2:
The patent applies universality by making the traffic light controller handle multiple functions including optical communication, challenge generation, code validation, and authorization decisions. This multi-functional approach eliminates the need for separate dedicated transceiver hardware on vehicles and intersections, reducing overall system complexity while maintaining secure access control.
3Reliability
If vehicle codes are removed from the system database, then security is improved, but coordination and implementation become burdensome and expensive
Solution Approach 1:
The patent applies preliminary action by establishing a challenge-response authentication framework before any code transmission occurs. The system pre-configures the challenge generation and validation mechanisms, so when a vehicle attempts access, the authentication happens dynamically without requiring manual code removal or updates to databases. This eliminates the burdensome coordination needed for code removal while maintaining security.
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 solution enhances security and efficiency by preventing unauthorized access while reducing the need for extensive equipment upgrades, allowing authorized vehicles to quickly navigate through intersections, thereby reducing wait times and fuel consumption for mass transit vehicles.
Implementation Method 1
optical pulse transmission from an optical emitter to an optical detector
Implementation Method 2
at least one bit of a data word is encoded as a function of amplitude modulation of a first subset of the set of signal pulses
Implementation Method 3
at least another bit of the data word is encoded as a function of frequency modulation of a second subset of the set of signal pulses
Implementation Method 4
The optical detector is adapted to receive the set of light pulses
Data Source
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AI summary
A remotely-controlled traffic preemption system and method includes an encoder circuit, an optical source, an optical detector, and a decoder circuit. The encoder circuit is adapted to generate a set of signal pulses. At least one bit of a data word is encoded as a function of amplitude modulation of a first subset of the set of signal pulses and at least another bit of the data word is encoded as a function of frequency modulation of a second subset of the set of signal pulses. The optical source is adapted to transmit a set of light pulses having a respective light pulse for each signal pulse of the set of signal pulses. The optical detector is adapted to receive the set of light pulses. The decoder circuit is adapted to generate the data word from the set of light pulses received at the optical detector.