Transmission During The Group Call; Call Restoration In Group Call; Temporary Group Address; Late Entry - Motorola MTM800 Product Information Manual

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If the user releases the PTT button, the terminal sends a message to the system withdrawing the
request.
2.2.10

Transmission during the Group Call

Whilst another user is talking during an ongoing group call and "PTT during received Group Call"
codeplug is disabled, a user cannot transmit by pressing and holding the PTT button.
The MS ignores the request to transmit without any indication. The user has to release and then
press again the PTT button to re-initiate a transmission request.
While the MS is in Emergency Mode the transmission request is not ignored.
2.2.11

Call Restoration in Group Call

If the terminal roams to a new cell during a group call, it will attempt to continue the call on the new
cell, using TETRA cell reselection and call restoration procedures.
If the terminal roams while the user is the transmitting party in the group call, and it is possible to
perform announced cell reselection, announced cell reselection will be employed as described in
Paragraph 9.4 "Roaming" and call restoration procedures will be performed in the new cell.
If the user is not the transmitting party, Unannounced cell reselection will be employed, followed by
call restoration procedures.
2.2.12

Temporary Group Address

The terminal supports a temporary group address assigned by the SwMI which is only valid for the
lifetime of the call. Thus, if the terminal initiates a group call on the selected group, and the SwMI
assigns the call to a temporary group, the terminal will monitor all signalling addressed to this
temporary group as long as the call is active.
The terminal supports assignment of an incoming group call to a temporary group address.
2.2.13

Late Entry

The terminal assumes that the SwMI sends repeated setup messages ('late entry') on the main
control channel. Thus, in certain circumstances (such as when receiving a priority monitor call if
provisioned as "Presented" - See Paragraph 2.1.13 "Priority Monitor") it will ignore a group call D-
SETUP PDU on the assumption that it can join the call at a later time.
The terminal will join a group call setup which contains an SS-LE notification element indicating Late
Entry Broadcast. However, it will not differentiate between this and a regular call setup in any way.
Note: Acknowledged Late Entry, and Late Entry Paging is not supported.
2.2.14

User initiated Group Attachment

When the user changes the selected talkgroup, the terminal will initiate an attachment to the SwMI,
detaching the old group and attaching the new Talkgroup.
All group attachments sent by the terminal are sent with "attachment mode" of "amendment" or
"detach all..." on a case-to-case basis depending on which form will cause less bits to be sent over
the air interface.
When the user selects a scan list and turns scanning on, the terminal will send a group attachment
request to attach the scan groups in addition to the selected group. Similarly, when the user selects
an ATG, the terminal will send 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,
6866537D87-F Chapter 2 - MTM800 Product Information Manual
Services and Feature Description
September 2008