Transmission During Group Call; Call Restoration; Temporary Group Address; Late Entry - Motorola MTP830 S Product Information Manual

28 | Services and Features
Note: The SwMI decides about the ownership of a call.

Transmission During Group Call

While receiving a group call, and the PTT during received Group Call is enabled, you may request to transmit by
pressing and holding the PTT. The system registers this action and informs you that the request has been queued.
If you release the PTT, the radio sends a message to the system withdrawing the request.

Call Restoration

If the radio roams to a new cell during a call, it attempts to continue the call on the new cell. Cell reselection and call
restoration procedures are employed for this attempt.
If the radio roams while being the transmitting party in the call, an announced cell reselection, if possible, is carried
out in the new cell.
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. When you change the selected talkgroup, the radio initiates an attachment to the SwMI,
detaching the old group and attaching the new one.
All group attachments sent by the radio are sent with attachment mode of Amendment or Detach all... depending on
which form causes sending less bits over the air interface.
When you turn on scanning and then select the scan list, the radio sends a group attachment request to attach the scan
groups in addition to the selected group. Similarly, when you select an ATG, the radio sends an attachment of the
ATG as the selected group along with the attachment of the associated groups as scan groups. If a group associated
with an ATG is selected, the radio sends an attachment of the ATG as the selected group and as a scan group.
The TETRA TIP provides a facility by which the radio can send a status message to the SwMI to turn scanning off
and on to save air interface signaling.
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