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If the radio is not the transmitting party, an unannounced cell reselection is employed, followed by call restoration
procedures.
Temporary Group Address
The radio supports the temporary group address assigned by the SwMI. The address is valid only for the lifetime of
the call.
The radio monitors signaling addressed to the temporary group, when the radio initiates a group call on the selected
group, and the SwMI assigns the call to a temporary group.
The radio supports assignment of an incoming group call to a temporary group address.
Late Entry
The user can join the group call even if not participating in it from the beginning. This is possible for example, if a
user turns on their TETRA terminal, in such a case the system diverts the user's terminal to a talkgroup call, if a call is
already in progress. Similarly, if the user's terminal has been outside of the radio coverage, for example in a tunnel,
the control channel will also divert the user's terminal to a talkgroup call assuming a call is already in progress.
Note: For TMO this feature must be configured on SwMI. Acknowledged late entry, and late entry paging
are not supported.
User Initiated Group Attachment
To enable a radio to use a group, the radio should attach the group. The radio initiates a group attachment request to
the SwMI after the RCU initialization. The attachment occurs whenever you initiate a group change and when the
radio registers on a new site.
SwMI Initiated Group Attach/Detach
The Switching and Management Infrastructure (SwMI) can send a talkgroup attachment to the radio. The radio will
attach to it, even if this talkgroup had not been programmed in the codeplug.
If the radio receives a SwMI initiated attachment for the group already currently selected, the radio accepts the
attachment, and keeps the group selected.
If the radio receives a SwMI initiated attachment for a group in the currently active scan list, the attachment is
accepted. If it is for a group that is not in the current active scan list, the attachment is rejected.
If the detachment is for the selected group, the display indicates that no group is currently selected. If the detachment
is for a group that is in the scan list, the group remains in the list. However, it is not monitored. If the detachment is
for a group that is in the SwMI controlled list, it is removed from that list.
Emergency Operations
Emergency Operations are used in critical situations.
Pressing the EMERGENCY button or entering Emergency number and pressing the SEND key, activates one or more
services (depends on the service provider setting):
•
Sending Emergency Alarm
•
Sending SDS Status
•
Starting Silent Emergency
•
Starting Hot Microphone operation
•
Starting Emergency Individual Call (Private or MS-ISDN)
Services and Features | 31
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