Objective
The objective of the ERWIN exploratory action was to investigate the domain of fixed-to-mobile communications with particular emphasis on ground-to-train communications. These communications involve the railway operator's requirements, railway services offered to passengers, and passenger services such as telephone or mobile office services.
The objective of the European railways in house network (ERWIN) exploratory action was to investigate the domain of fixed to mobile communications with particular emphasis on ground to train communications. These communications involve the railway operator's requirements, railway services offered to passengers, and passenger services such as telephone or mobile office services. 3 communication segments have been investigated:
the on board segment (communications aboard a train);
the ground to train segment (the 'hop' between the moving platform and fixed equipment);
the ground segment (communication between the ground end of the ground to train segment and railway control centres or gateways to public networks).
2 applications account for the bulk of the demand for on board services and track side communications: train control and passenger telephone services. For the on board segment, wire vehicle highways with fibre and wire train highways are thought to be the best architectures in the near term. For the ground to train segment, there was a strong wish to use an existing system. The most promising candidates appeared to be TETRA (only data services and speech transmission offered) and GSM (telephone services offered also). There are, however, technical problems to be overcome, and alternative solutions have therefore been investigated. An attractive one is a radio link with a modulation and equalising scheme. Another appealing avenue has been identified as the emerging short-range micrograph communication technology. Yet another solution, of interest on low-traffic routes would be basedon a coming generation or low orbit communications satellites. For ground communications, the workability of a number of longer distance local area networks (LAN) and metropolitan area networks (MAN) in a railway environment have been assessed. However current drop and insert punched card machine (PCM) technology may suffice for most if not all ground communications requireme nts.
Critical communications have to be carried along with less critical ones, which may give rise to conflicting requirements. 2 interesting approaches have been identified. Static scheduling analysis is applicable when resources access needs are known in advance: this is the case of most embedded systems, such as train control. Dynamic scheduling analysis is applicable where resource access needs cannot be precisely determined: this is the case of most open systems, such as passenger services.
Three communication segments have been investigated:
- the on-board segment, which focuses on communications aboard a train, viewed as a mobile and reconfigurable platform
- the ground-to-train segment, which deals with the "hop" between the moving platform and fixed equipment such as radio base-stations;
- the ground segment, which focuses on communication between the ground end of the ground-to-train segment and railway control centres or gateways to public networks.
While the basic ground-to-train services involve all three segments, it has seemed appropriate to also consider services that will only use one of them, namely purely on-board services and track-side communications.
Fields of science (EuroSciVoc)
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
- engineering and technology mechanical engineering vehicle engineering aerospace engineering satellite technology
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75379 Paris
France
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