Software-defined railway wireless communication network
WANG Kaifeng1,2,3, ZHANG Qi2,3, LIU Chang2,3, DU Yazhen4, CHEN Ningning1,2,3, GAO Ying1,3
1. Postgraduate Department, China Academy of Railway Sciences, Beijing 100081, China; 2. Signal and Communication Research Institute, China Academy of Railway Sciences Corporation Limited, Beijing 100081, China; 3. National Research Center of Railway Intelligence Transportation System Engineering Technology, Beijing 100081, China; 4. Beijing Research Institute of Telemetry, Beijing 100076, China
Abstract：Railway wireless data communications have problems with insufficient bandwidth and poor reliability. This paper describes a railway software-defined wireless communication network (RailSDN) which separates the control plane from the data plane, enables heterogeneous network interoperability among operators, provides user logical isolation using virtualization, and provides transparent data transmission for users. A network resource scheduling model is developed based on a Markov decision process which takes into account various factors such as the infrastructure network status and the user requirements. The system searches for the optimal link allocation with the optimization goal being to satisfy user demand and dynamically adapts to the user requirements for the network resources. Tests show that this railway wireless communication network is scalable, enables flexible customization of user demand, and improves the network resources utilization efficiency.
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2019, Vol. 59 
