Urban rail transit plays an increasingly important role in urbanization processes. Communications-Based Train Control (CBTC)\nSystems, Passenger Information Systems (PIS), and Closed Circuit Television (CCTV) are key applications of urban rail transit\nto ensure its normal operation. In existing urban rail transit systems, different applications are deployed with independent train\nground communication systems. When the train ground communication systems are built repeatedly, limited wireless spectrum\nwill be wasted, and the maintenance work will also become complicated. In this paper, we design a network virtualization based\nintegrated train ground communication system, in which all the applications in urban rail transit can share the same physical\ninfrastructure. In order to better satisfy the Quality of Service (QoS) requirement of each application, this paper proposes a virtual\nresource allocation algorithm based on QoS guarantee, base station load balance, and application station fairness. Moreover, with\nthe latest achievement of distributed convex optimization, we exploit a novel distributed optimization method based on alternating\ndirection method of multipliers (ADMM) to solve the virtual resource allocation problem. Extensive simulation results indicate\nthat the QoS of the designed integrated train ground communication system can be improved significantly using the proposed\nalgorithm.
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