By Émilie Masson, Marion Berbineau
This ebook specializes in the desires of railway operators by way of instant communications, divided in major different types: the economic companies and the operational wishes. Then, all on hand applied sciences that may be used to supply web entry on board trains and the entire different operational functions requiring excessive potential are specific. ultimately, demanding situations and developments in railway telecommunications are highlighted, throughout the presentation of the long run and rising applied sciences, the present discussions and works within the various professionals, and the most important demanding situations and medical barriers.
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Extra info for Broadband Wireless Communications for Railway Applications: For Onboard Internet Access and Other Applications
We talk about a two-hop communication solution. The benefits of using such an architecture is that the TAT can manage different types of technology, and perform some smart agility to select the best means of communication and then to rise the obtained throughputs. For the services aiming at connecting passengers to Internet, such an architecture brings various advantages: • Avoiding Faraday cage and re-enforcing signal power and sensibility with the roof antenna; • Reducing the handover of all passengers’ connections into a single terminal handover, which aggregates all the traffic.
3. Many researches that will be presented in the Chap. 2 stated that the TAT approach works better by combining a set of several wireless technologies instead of only one way to provide broadband communication [29, 30]. There is one technology used to provide connectivity. A second technology, so-called “gap-filler”, is used when the first one is no more available. Such a mechanism implies a preferred technology to provide the connection . Criteria to determine on which technology the terminal has to switch are the availability of the links, the quality of the connection (signal strength), delays, throughput and/or economic considerations (costs).
The spacing in frequency between two physical channels is 200 kHz. The modulation type is the Gaussian Minimum Shift Keying (GMSK). 615 ms period). Each TDMA frame is divided into 8 time slots also known as logical channels (with a duration of 577 microseconds each) composed of 148 bits of information. GSM-R uses a lower extension 900 MHz GSM frequencies. Unlike services such as on board Internet access and video surveillance, the most stringent requirements for safety-related communications are more related to the service reliability and availability rather than data rate transmission.
Broadband Wireless Communications for Railway Applications: For Onboard Internet Access and Other Applications by Émilie Masson, Marion Berbineau