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Data communication technology is one of the key subsystem in Communication-Based Train Control (CBTC), which is an automated train control system for railways that ensures safe operation of rail vehicles using data communications. In CBTC systems, less service availability could cause train derailment, collision or even catastrophic loss of lives or assets. Therefore, the availability of data communication should be carefully considered in designing CBTC systems. In this paper, the authors propose two WLAN-based data communication systems with redundancy in CBTC systems.
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