For the purposes of the present document, the terms and definitions given in TR 21.905
and the following apply. A term defined in the present document takes precedence over the definition of the same term, if any, in TR 21.905
Automatic Train Operation (ATO):
Automatic Train Operation applications are responsible for acceleration to the permitted speed, speed reduction where necessary due to speed restrictions and stop at designated stations in the correct location.
Automatic Train Protection (ATP):
Automatic Train Protection applications are responsible for giving Limit of Movement Authority to a train based on the train's current speed, its braking capability and the distance it can go before it must stop.
An electronic beacon or transponder placed between the rails of a railway as part of an automatic train protection or operation (ATP/ATO) system.
Business communication applications:
communication applications that support the railway business operation in general, such as wireless internet, etc.
Controller (Train Controller):
A Ground FRMCS User provided with special capabilities by the FRMCS System.
Driver (Train Driver):
A Mobile FRMCS User provided with special capabilities by the FRMCS System.
A general category of stationary FRMCS Users. For example, External Systems could be systems monitoring for trains passing a red light to initiate a railway emergency call.
The application on a 3GPP UE offering railway specific communication services to the FRMCS User by making use of the communication capabilities offered by the 3GPP UE and the 3GPP network.
FRMCS Equipment Identity:
The identity by which a FRMCS equipment can be addressed.
FRMCS Equipment Type:
Indicates the purpose the FRMCS equipment is being used for, FRMCS equipment of different equipment types do have different capabilities.
The FRMCS Equipment consists of a 3GPP UE and a FRMCS Application residing on it. It may be combined with legacy railway communication equipment (e.g. GSM-R or TRS)
FRMCS Functional Identity:
The identity related to a user or related to the equipment, as specified in 9.3 "Role management and presence" indicating its special Role (e.g. as Driver of a specific train, usually a train number) can be addressed.
this is a sub-part of the FRMCS System.
The ability for a FRMCS User to make use of FRMCS Applications in a Visited (FRMCS) Network.
The system providing railway specific communication constituted of the FRMCS Equipment, the 3GPP transport and the application servers in the network. Legacy networks are not included in the FRMCS System.
FRMCS User Identity:
The identity by which a FRMCS User can be addressed.
A human user or a machine making use of the railway specific communication. FRMCS Users can be connected via 3GPP RAT, wired connectivity or other radio technology
Ground FRMCS User:
A general category of FRMCS Users that are predominantly stationary. Mostly they are connected via wired connectivity but may be using also wireless in certain conditions.
Home FRMCS Network:
The Home FRMCS Network is the network in which the FRMCS User is engaged in a subscription.
Mobile FRMCS User:
A general category of FRMCS Users that are mobile. Thus, they are connected via wireless connectivity all the time.
direct communication between FRMCS Users in proximity.
indirect communication between FRMCS Users connected to FRMCS Network(s).
Performance communication applications:
applications that help to improve the performance of the railway operation, such as train departure, telemetry, etc.
Radio Block Centre (RBC):
A train sends its position and speed information periodically to the RBC. The RBC uses the received information to decide movement authority of the train.
Rail Infrastructure Manager:
A company that owns or manages rail infrastructure; within this document the Rail Infrastructure Manager owns, administrates and operates the FRMCS Network.
A company that offers train freight or passenger transportation services, making use of FRMCS network for their operational communication needs that is operated by a Rail Infrastructure Manager.
Role (Functional Role):
The function a FRMCS User or a FRMCS Equipment is currently performing. Examples of Roles are Driver, Controller or shunting staff, etc. This is indicated by the FRMCS Functional Identity.
manoeuvring trains in order to change their location or composition.
Staff working as trackside maintenance and/or shunting members
FRMCS Equipment which is physically embedded in train
Visited (FRMCS) Network:
A Visited (FRMCS) Network can be either another FRMCS Network than the Home FRMCS Network, or a Public Land Mobile Network (PLMN).
For the purposes of the present document, the abbreviations given in TR 21.905
and the following apply.
An abbreviation defined in the present document takes precedence over the definition of the same abbreviation, if any, in TR 21.905
Automatic Train Operation
Automatic Train Protection
Assured Voice Communication
Denial of Service
Global Navigation Satellite System
Land Mobile Radio
Multi Access Core Network
On-board Automatic Train Protection
Public Safety Answering Point
Radio Block Centre
Railway Emergency Communication
Trunked Radio System
Wayside Automatic Train Protection