Research on Railway Emergency Ad Hoc Network Based on Cognitive Radio
Jianli Xie · Journal of the China Railway Society · 2013
Due to the unceasingly intensified requirements for communication safety and the continuously growing demand for diversified services of high-speed railways,GSM-R networks are facing more and more technical challenges.Considering the fact that the base station network elements cannot provide wireless communication services for terminals in case of emergent accidents,the paper constructed the railway emergency ad hoc network using cognitive radio(CR) technology to achieve the goal of emergency communication.Based on the description of railway emergency communication scenarios,the CR railway emergency ad hoc network model was established,and the technical challenges to be faced by the ad hoc network were analyzed,including the design of dual-mode terminals,clustering algorithm,spectrum sensing and operation mode of railways.Finally,clusterheads selection and clustering spectrum sensing technology were elaborated.