By Émilie Masson, Marion Berbineau
This publication makes a speciality of the desires of railway operators by way of instant communications, divided in major different types: the industrial companies and the operational wishes. Then, all to be had applied sciences that may be used to supply net entry on board trains and the entire different operational functions requiring excessive ability are exact. eventually, demanding situations and tendencies in railway telecommunications are highlighted, during the presentation of the long run and rising applied sciences, the present discussions and works within the varied experts, and the main demanding situations and medical barriers.
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Extra resources for Broadband Wireless Communications for Railway Applications: For Onboard Internet Access and Other Applications
Audio applications can be divided as follows: • Conversational voice: requirements in terms of delay are heavily influenced by one-way delay; for information loss, requirements are influenced by the fact that human ear is tolerant to a certain amount of distortion of a speech signal; • Voice messaging: requirements are similar in terms of information loss but quiet different in terms of delay where there is more tolerance because of the no direct conversation involved; • Audio streaming: requirements in terms of information loss have to be tighter than classical conversational voice to provide better quality.
In the second case, less capacity could be needed, by transmitting for instance images from one camera and by degrading the image quality. To have an idea, a downlink throughput of 512 kbps is sufficient (just to have a control/command on the CCTV application). The uplink throughput is evaluated at about 1 Mbps, considering the transmission of the flow of one camera, with 25 images per second, and a rate of compression of 1:50 (using H264 compression algorithm for instance). As for multimedia applications that will be seen in the following, CCTV has some QoS criteria, such as: • • • • • Delay; Delay variation; Information loss: packet error rates of about 10−2 for 1 Mo length packets; Throughputs: several decades of Mbps; Cohabitation with other wireless systems without interference.
The approach of the project was to integrate several wireless railway information systems, dealing with operation, traffic management, rolling-stock and infrastructure domains. The project defined then an ITS architecture based on middleware and IP-based solutions, in the railway domain. The project aimed to create a holistic and coherent information system in order to obtain higher levels of performance in terms of capacity, average speed and punctuality in addition to an optimization of the resources usage .