Virtual resource allocation in a network virtualization based integrated train ground communication system
Train ground communication systems for different applications are deployed and managed independently in current urban rail transit systems with Wireless Local Area Network (WLAN) technology. Investing and constructing communication infrastructures repeatedly not only waste substantial social resources but also bring many difficulties to maintain all these infrastructures. In this paper, we design a network virtualization based integrated train ground communication system for urban rail transit systems. The virtual resource allocation in the integrated system is formulated as an optimization problem. On the premise that the train ground communication requirement of communication based train control system is guaranteed, the optimization objective is to maximize the long-term general utility for all the urban rail transit applications. We use the distributed method based on alternating direction method of multipliers (ADMM) to solve the optimization problem. Simulation results show that the designed integrated train ground communication system quality of service (QoS) can be improved effectively with the proposed approach.