In Communication-Based Train Control (CBTC) systems, trains communicate with wayside access points (APs) placed along a track using 802.11 or similar wireless technologies. A critical component of the communication system is the handover algorithm used by a train to select an AP as it moves along a track. As a safety-critical system, the number of handovers should be kept small and selected APs must satisfy given QoS requirements. We present a novel measurement-based handover algorithm for CBTC systems that exploits the predictable motion paths of trains. Using empirical measurements from a rail communication system, we show that our algorithm keeps the number of required handovers small, while avoiding ping-pong handovers, i.e., situations where a train bounces back and forth between the same access points.
Measurement-Based Handover Method for Communication-Based Train Control Systems
2017-09-01
401125 byte
Conference paper
Electronic Resource
English
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