SIGNALLING & TELECOMMUNICATIONSSUPPLEMENT 07


GNSS to the proper TM controller deter - mined by LDA.


Requisite 1 is listed because the authors are aware of an important concept because of their experience in the railway field: all new proposed solutions, even the simplest ones (like minor changes to software algorithms, for example), must not interfere in any way with the existent, well-tested and carefully specified imple - mentations. The architecture we propose for fulfilling all the listed requirements is shown in Figure 1.


The proposed system should follow the following workflow: 1. The Cab-Radio produces a REC because of the driver action due to a safety relevant episode


2. The Cab-Radio performs all the required actions, including the transmission of the ‘REC sent’ signal to the Trainborne Recorder (TR) for juridical purposes


3. The TR records the ‘REC sent’ event 4. Moreover, the TR, properly equipped with additional internal modules as


Figure 1: High-level architecture for REC-producing train improved positioning system


shown in Figure 1, acquires the GNSS positioning information


5. After the acquisition of train location information, TR sends them to the ‘proper’ TM controller via its internal GSM-R modem. The ‘proper’” TM controller is identified by the GSM-R modem using LDA.


The proposed workflow fulfills all these mentioned requirements. In particular, only TR is involved in the process of sending very accurate location information to TM: in this way, the CR


working during REC production it is not affected in any way. Moreover, if TR fails in sending GNSS information, a poorer positioning of emergency-involved train is still possible via CR LDA (as done nowadays).


Technological choices and realisations All the elements shown in Figure 1 should be carefully chosen for achieving the improve - ments described in this paper. However, the present technology is able to provide all the products/performances we need.


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