A novel handover scheme in wireless LAN in CBTC system

Wireless LAN technologies are adopted in most train-wayside communication systems in CBTC. The handover interruption time between WLAN APs is one of the key parameters which affect the train-wayside communication performance. A location based handover scheme for WLAN in tunnels is proposed in this paper for the CBTC system. By the proposed location based handover scheme, the mobile train can initiate the reassociation request directly without the process of scanning and probe stage. The simulation results show that the proposed scheme can reduce the handover interruption time for wireless LAN networks in CBTC system.