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GSM-R user procedures (cab radio Version 2)

2 The GSM-R systems

GSM-R is based on the same technology that is used for public GSM (mobile phone)

networks. However there are some extras added for railways.

The GSM-R system is made up of a network of radio base stations installed at the side of

the track at regular intervals (about every five or six kilometres depending on the local

environment and so on). These provide radio coverage for the cab radio and people using

the GSM-R mobile system. This coverage includes tunnels as extra equipment, known as

a repeater or leaky feeder, is provided to make sure that there is always network

coverage. The coverage associated with an individual base station and its related

repeater or repeaters is known as a cell.

Base stations are linked together in groups and connected to a central call-routing switch,

the mobile switching centre (MSC) – Figure 1. This MSC confirms that users are

authorised to use the system, connects calls between system users, and provides access

to other networks if allowed. The MSC also receives information from other systems such

as the signalling system (in areas where this is available). This provides an accurate

source of train location information that the MSC uses to route calls to the appropriate

signaller (or controller).

A GSM-R cab radio is provided in each driving cab for use by competent members of train

crew who are authorised, for example, drivers. GSM-R fixed terminals are provided for

use by signallers, operations controllers and electrical control operators.

2.1 Network features

The GSM-R system introduces a number of services and benefits to the user. The

services provided include:

 Point-to-point calls.

 Pre-defined operational text messages, for specific situations.

 Broadcast calls.

 Emergency group calls.

The system can also:

 Route calls automatically from a registered cab radio.

 Automatically changes channels.

 Provide call waiting.

 Allow calls to be put on hold.

 Identifiy who is calling or being called.

 Allow more than one person to use the system.

 Prioritise calls.

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Siemens NRN 67 Series Spezifikationen Seite 11