Figure 10.3.7.5.1-1 illustrates the procedure when a user attempts to set up a MCPTT group call on a group involved in an in-progress pre-configured group regroup, homed in the IWF.
Pre-conditions:
The MCPTT client is an affiliated member of MCPTT group A that is part of an in-progress pre-configured group regroup with MCPTT groups B and C. MCPTT groups A, B and C can be homed in either the IWF or the MCPTT system.
MCPTT group D is being used as the pre-configured group regroup. MCPTT group D is homed in the IWF.
The MCPTT client has missed the pre-configured regroup request message (e.g. poor signalling conditions, race condition).
The MCPTT client attempts to start a call on MCPTT group A. The MCPTT client sends a group call request message to the MCPTT server containing MCPTT group A as the target group.
The IWF sends an IWF group call response to the MCPTT server indicating that the call set up is denied because the group is part of an in-progress pre-configured group regroup.
The MCPTT server forwards the response to the IWF as an IWF pre-configured regroup response. The IWF affiliates the regrouped MCPTT client to the pre-configured group regroup.
Figure 10.3.7.6.1-1 illustrates the procedure when an MCPTT user attempts to set up a MCPTT group call on a pre-configured regroup group after the pre-configured MCPTT group regroup has been cancelled.
Pre-conditions:
The MCPTT client is a member of MCPTT group A that was part of an in-progress pre-configured group regroup with MCPTT groups B and C that has been cancelled. MCPTT group D was used as the pre-configured regroup group. MCPTT group D is homed in the IWF.
The MCPTT client has missed the pre-configured regroup cancel request message (e.g. poor signalling conditions, race condition).
The MCPTT client attempts to start a call on MCPTT group D, the pre-configured regroup group. The MCPTT client sends a group call request message to the MCPTT server containing MCPTT group D as the target group.
Figure 10.3.7.7.1-1 illustrates the procedure to add a newly affiliated MCPTT user to an in-progress pre-configured group regroup operation.
Pre-conditions:
The MCPTT client is a member of, but not yet affiliated with, a MCPTT group that is part of an in-progress pre-configured group regroup operation.
The MCPTT group identity and group configuration for the regroup MCPTT group has been pre-configured in the MCPTT client, and the MCPTT client has received the relevant security related information to allow it to communicate in the pre-configured group regroup.
The MCPTT client affiliates to an MCPTT group that is currently part of an in-progress pre-configured group regroup. The affiliation follows the procedure in subclause 10.1.2.4.
The MCPTT client may send the pre-configured regroup response to the MCPTT server to acknowledge the regrouping action. These acknowledgements are not sent in response to a multicast transmission of the pre-configured regroup request.
Figure 10.3.7.7.2-1 illustrates the procedure to add a newly affiliated user homed in the IWF to an in-progress pre-configured group regroup operation.
Pre-conditions:
The LMR user is a member of, but not yet affiliated to, an MCPTT group that is part of an in-progress pre-configured group regroup operation.
The MCPTT group identity and group configuration for the pre-configured group regroup has been pre-configured in the IWF, and the IWF has received the relevant security related information to allow it to communicate in the pre-configured group regroup.
The IWF affiliates to an MCPTT group that is currently part of an in-progress pre-configured group regroup. The affiliation follows the procedure in subclause 10.1.2.2.
The MCPTT server retrieves the MCPTT group ID of the pre-configured group regroup and the MCPTT group ID of the group from which configuration information for the pre-configured group regroup is to be taken.