Siemens NRN 67 Series Dokumentacja Strona 9

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GSM-R user procedures (cab radio Version 2)
1.3 Definitions
Call routing
Cell-based call routing:
A way of making calls to people who are registered based
on where the caller is, for example, calls will be routed to
the nominated signaller, operations controller or ECO.
Cell-based routing uses information based on which cell
the caller is within the GSM-R network to route the call.
Signalling system-based call routing:
Signalling system-based call routing uses information
taken from the signalling system to improve the location
information (where a call comes from) provided by GSM-R
to provide accurate call routing. This means that a call to a
signaller is always routed to the correct signaller for that
location (signal).
Cell
The area covered by a single GSM-R base station
including any associated repeaters.
Driver-only
A train that is worked only by a driver and does not have a
guard.
Group call area
A predefined cluster of cells, which are set within the GSM-
R network and normally consisting of three cells. This
ensures that any group call initiated can be heard in the
cell of origin and any adjoining cell.
The type of group call will determine who will receive the
call, for example, a railway emergency group call will be
received by all cab radio users within the group call area,
including any that may enter the area once the call has
been established.
Fixed terminal users will also be included in the group call,
for example, at least one:
signaller.
operations controller.
However, because of the geographical area that most fixed
terminal users control it will be normal for them to be
associated with several group call areas.
Train Reporting
Number
This four character number (number, letter, number,
number), commonly termed “Headcode,” is used for
railway systems, publications and communication. A train
reporting number may be used for more than one train on
the network at any time, included in the same signallers
area of control.
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