Communication Availability in Communications-Based TCSs ◾ 113
6.7 Conclusion
Service availability is an important issue in CBTC systems. In this chapter, we
proposed two WLAN-based data communication systems with redundancy con-
gurations to improve the CBTC communication availability. We modeled each
system as a CTMC. In order to check the soundness of the CTMC model, the data
communication system behavior was modeled with DSPN. e availability of dif-
ferent data communication systems was compared. e results also show that the
two proposed redundancy congurations signicantly improve system availability,
and the redundancy conguration with the backup link at the head and tail on the
train achieves the best performance.
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