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Content for  TS 23.283  Word version:  18.1.0

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10.3.7.5  Pre-configured regroup update proceduresp. 80

10.3.7.5.1  MCPTT client PTTs on MCPTT group during an in-progress pre-configured group regroupp. 80
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).
Copy of original 3GPP image for 3GPP TS 23.283, Fig. 10.3.7.5.1-1: Procedure for MCPTT client PTTs on MCPTT group during an in-progress pre-configured group regroup
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Step 1.
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.
Step 2.
The MCPTT server forwards the request to the IWF as an IWF group call request.
Step 3.
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.
Step 4.
The MCPTT server forwards the response to the MCPTT client as a group call response.
Step 5.
The IWF sends an IWF pre-configured regroup request to the MCPTT server containing MCPTT group D, the group ID of the pre-configured group regroup.
Step 6.
The MCPTT server forwards the request to the MCPTT client as a pre-configured regroup request.
Step 7.
The MCPTT client notifies the user of the group call set up failure and of the regrouping procedure.
Step 8.
The MCPTT client sends the pre-configured regroup response to the MCPTT server to acknowledge the regrouping action.
Step 9.
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.
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10.3.7.6  Call request on pre-configured regroup group after group regroup has been cancelledp. 82

10.3.7.6.1  MCPTT client PTTs on pre-configured regroup group after group regroup has been cancelledp. 82
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).
Copy of original 3GPP image for 3GPP TS 23.283, Fig. 10.3.7.6.1-1: Procedure for MCPTT client PTTs on pre-configured regroup group after the group regroup is cancelled
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Step 1.
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.
Step 2.
The MCPTT server forwards the request to the IWF as an IWF group call request.
Step 3.
The IWF sends an IWF group call response to the MCPTT server indicating that the call set up is denied because the group regroup is no longer active.
Step 4.
The MCPTT server forwards the response to the MCPTT client as a group call response
Step 5.
The IWF sends an IWF pre-configured regroup cancel request to the MCPTT server.
Step 6.
The MCPTT server forwards the request as a pre-configured regroup cancel request to the MCPTT client.
Step 7.
The MCPTT client notifies the user of the group call set up failure and of the regrouping cancellation.
Step 8.
The MCPTT client sends a pre-configured regroup cancel response to the MCPTT server to acknowledge the regrouping cancellation.
Step 9.
The MCPTT server forwards the response to the IWF as an IWF pre-configured regroup cancel response.
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10.3.7.7  Adding newly affiliated user to a pre-configured group regroupp. 83

10.3.7.7.1  Adding newly affiliated MCPTT user to a pre-configured group regroupp. 83
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.
Copy of original 3GPP image for 3GPP TS 23.283, Fig. 10.3.7.7.1-1: Procedure to add a newly affiliated user to a pre-configured group regroup
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Step 1.
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.
Step 2.
The IWF sends an IWF pre-configured regroup request to the MCPTT server.
Step 3.
The MCPTT server sends a pre-configured regroup request to the MCPTT client.
Step 4.
The MCPTT client notifies the user of the regrouping.
Step 5.
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.
Step 6.
The MCPTT server sends an IWF pre-configured regroup response to the IWF. The IWF affiliates the MCPTT client to the group regroup.
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10.3.7.7.2  Adding newly affiliated user homed in the IWF to a pre-configured group regroupp. 84
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.
Copy of original 3GPP image for 3GPP TS 23.283, Fig. 10.3.7.7.2-1: Procedure to add a newly affiliated user to a pre-configured regroup
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Step 1.
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.
Step 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.
Step 3.
The MCPTT server sends an IWF pre-configured regroup request to the IWF.
Step 4.
The IWF sends an IWF pre-configured regroup response to the MCPTT server to acknowledge the regrouping action.
Step 5.
The MCPTT server affiliates the IWF to the group regroup.
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