Parallel Wireless Links for Train Controller Reliability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing head-of-train (HOT) and end-of-train (EOT) devices in trains rely on a single wireless communication channel, which can lead to prolonged communication disruptions in challenging RF environments, posing safety risks, especially during emergency braking scenarios.
Innovation Solution
Implementing multiple wireless communication channels operating at different radio carrier frequencies, allowing them to be active and in communication in parallel, and then becoming inactive, with data integrity checks using methods like checksums or CRC to ensure reliable data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single wireless communication channel is used between HOT and EOT, then device complexity is reduced, but communication reliability deteriorates in challenging RF environments
Solution Approach 1:
The communication system is segmented into multiple independent wireless communication channels operating at different radio carrier frequencies. Each channel functions as a separate communication path between HOT and EOT, allowing the system to divide the communication task across multiple frequency bands to improve reliability while managing complexity through modular channel implementation
Solution Approach 2:
The system changes the frequency parameter by operating multiple communication channels at different radio carrier frequencies. This parameter diversification allows the system to overcome RF environment challenges by switching or simultaneously utilizing channels at different frequencies, thereby improving communication reliability without requiring complete system redesign
2Reliability
If multiple wireless communication channels operate in parallel, then communication reliability improves, but energy consumption increases
Solution Approach 1:
The wireless communication channels are implemented dynamically with the ability to activate or deactivate specific channels based on communication needs and channel quality. The system can switch between active and inactive states for each channel, allowing reliability improvement through multiple channels while managing energy consumption by deactivating channels when not needed or when a single channel suffices
Solution Approach 2:
The system employs periodic communication cycles where channels are activated for data transmission and then deactivated. This periodic operation pattern allows the system to maintain reliability through multiple available channels while reducing energy consumption by limiting active transmission to only when necessary, creating a balance between reliability and energy usage
Data Source
AI summary
A method of communication between first and second controllers positioned in spaced relation along a length of a train includes forming between the first and second controllers, first and second wireless communication channels operating at different carrier frequencies and causing the first and second wireless communication channels to be in communication in parallel, whereupon the first and second controllers are in communication via both the first and second wireless communication channels. The first controller then causes information to be transmitted in parallel on the first and second wireless communication channels to the second controller and the second controller receives the information transmitted in parallel on first and second wireless communication channels. The first and second wireless communication channels are then caused to be inactive, whereupon the first and second controllers are out of communication.