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GSM-R user procedures (cab radio Version 2)

2.2 GSM-R call types

There are two generic types of call in GSM-R - point-to-point calls and group calls. Within

each of these types of call there are a number of variants as listed in Table 1. Generally,

in the case of the cab radio, taking part in a group call involves using the press to talk

(PTT) button to speak to the other people involved in the conversation whereas taking part

in a point-to-point call does not. Fixed terminal users (in other words, the signaller,

operations controller or ECO) must use the PTT for all types of call.

A point-to-point call is a call between two people (like a normal telephone call) where one

person dials another and both people can speak at the same time. The call will continue

until either person ends it.

A group call will be connected to everyone in the specific GSM-R area that the call was

aimed at. The group call allows only one cab radio user in the group to talk at any time

(managed by the PTT button on the handset). However, those using fixed terminals who

are involved in the call can override this and may talk at any time. A user will leave the call

when they leave the group call area (for example, a train crossing the boundary of the last

cell in the group-call area will leave the call) or when the call is ended.

Point-to-point calls

Group calls

Standard point-to-point call

Railway emergency group call

Urgent point-to-point call

Shunting group call

Public address call (Received only)

Shunting emergency group call

Berth triggered broadcast call (Received

only)

Broadcast area call (Received only)

Table 1 - Types of GSM-R calls

2.3 Point-to-Point calls

2.3.1 Normal Point-to-Point calls

A conventional phone call between two people as described above.

2.3.2 Urgent point-to-point call

The network will give an urgent point-to-point call a higher priority than the normal one.

When the call is made from the cab radio, this type of call only goes to the signaller. It

should be used if a driver becomes aware of an incident that the signaller needs to know

about immediately, but which does not mean all other trains in the area have to be

stopped. The signaller can also make an urgent point-to-point call to a specific train in the

event of an urgent situation and verbally request the train to stop.

2.3.3 Broadcast call

A broadcast call is a one-way announcement from the signaller (or operations controller) to

all GSM-R cab radios in a pre-defined area. Broadcast calls are normally pre-recorded for

automatic broadcast at previously determined intervals or locations.

 Fixed terminal users have the ability to make live broadcast calls.

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