Handoff performance improvement in a network virtualization based integrated train ground communication system
In this paper, we propose a network virtualization based integrated train ground communication system for urban rail transit systems. In order to improve the CBTC subsystem performance during handoff, we propose a novel handoff scheme to support handoff between virtual networks. The application layer QoS parameter of the CBTC, PIS and CCTV subsystems is used as the performance measure in the handoff design. The proposed integrated train ground communication system QoS optimization problem is formulated as a Approximate Dynamic Programming (ADP) problem. Extensive simulation results show that the proposed integrated train ground communication system QoS can be improved substantially with our ADP based optimization model.