PUMA T2
Technical Handbook
Glossary
P/N: 779-0306/01
Revision 03
OTE Proprietary information
Page xxix
GLOSSARY
Air interface
The TETRA defined standard high-frequency interface
between a base station and a mobile station, or between
mobile stations mutually.
Direct Mode
Communication between mobile stations mutually, using
radio frequencies that fall outside the control of the network,
and without intervention of a base station.
Encryption
The cryptographic conversion of clear speech or data into
encrypted speech or data so that the content of the
message is no longer identifiable
Fixed Infrastructure
Permanently set up equipment and connections of the
network. A term with the same significance is Switching and
Management Infrastructure (SwMI). The fixed infrastructure
fullfills the SwMI-functionality of the network (switching
nodes, base stations, fixed connections databases,
interfaces, gateways, etc).
Gateway
A Gateway makes the interconnection possible of a network
with another communication network, where both networks
use different protocols. The Gateway provides the necessary
translation and interfacing with the other network.
Group Call
A group call is a speech call among several users. It is
realised making a call from an individual user toward a
group.
Half duplex call
In half duplex call, each MS or LS needs to ask for
permission to transmit for each transaction. In TETRA
trunked mode operation half duplex means two frequency
simplex operation.
Handover
The action of the switching of a communication session from
one cell to another cell or between radio channels in a cell.
Handover allows to maintain a communication session when
the mobile stations concerned move from one cell to another
cell, or switch between radio channels in a cell. See also cell
reselection.
Individual Call
An individual speech call is a bi-directional point to point
connection between two terminal equipment such as: Mobile
Station, Dispatchers, PABX / PSTN gateways.
Late Entry (LE)
During a multipoint speech call, the TETRA network can
send LE indications related to that call, to allow latecomer
users to join the ongoing speech call.
Message Trunking
A traffic channel is permanently allocated for the complete
duration of the call, which may include several separate call
transactions (several pressel activation's by separate
terminals). The channel is only de-allocated if the call is
(explicitly) released or if a time-out expires.
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