Аңдатпа
This paper presents a portable, inexpensive, wireless and long range train arrival notification system for railway safety applications. The purpose of the system is to notify workers servicing the rails about the arrival of a train in both directions of a railway in order to avoid accidents. The system consists of several components: the train coordinates system, the portable station component, the worker's wearable, and an Android application. A description of each of the components of the system is given focus on the communication mechanisms between those components. The system has been deployed in an experimental environment in Kazakhstan and the first experiments showed a communication range of several kilometers as well as low repeated number of packet losses. Moreover, the proposed protocol for the wearables exhibited an over 99.5% packet reception ratio (PRR) for scenarios without the presence of major obstacles.