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Content for  TS 23.379  Word version:  19.4.0

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10.19.3.2.4 Modification of ad hoc group call participants by the MCPTT server  10.19.3.2.5 Release ad hoc group call and stop determining the ad hoc group call participants by partner MCPTT system - Participants list determined by the MCPTT server 
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10.19.3.2.4  Modification of ad hoc group call participants by the MCPTT server  p. 253
Figure 10.19.3.2.4-1 below illustrates the MCPTT server modifying the ad hoc group call participants procedure involving multiple MCPTT systems.
Pre-conditions:
  1. The MCPTT user at MCPTT client 1 is authorized to initate ad hoc group call.
  2. The MCPTT server 1 of the primary and MCPTT server 2 of the partner MCPTT systems determined the participants for the ad hoc group call based on the criteria specified by the MCPTT client 1 while initiating the ad hoc group call.
  3. The MCPTT server 1 of the primary and MCPTT server 2 of the partner MCPTT systems continuously evaluates the criteria to monitor the list of users who meets or not meets the criteria for participating in the on-going ad hoc group call.
  4. The MCPTT server 1 of the primary MCPTT system detects that the MCPTT client 3 meets the criteria and MCPTT client 2 stops to meet the criteria specified by the MCPTT client 1.
  5. The MCPTT server 2 of the partner MCPTT system detects that the MCPTT client 5 meets the criteria and MCPTT client 4 stops to meet the criteria specified by the MCPTT client 1.
Reproduction of 3GPP TS 23.379, Fig. 10.19.3.2.4-1: Modification of ad hoc group call participants by the MCPTT server
Figure 10.19.3.2.4-1: Modification of ad hoc group call participants by the MCPTT server
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Step 1.
The ad hoc group call is established and on-going with the participants MCPTT client 1, MCPTT client 2, and MCPTT client 4. The participants list is determined by both primary and partner systems MCPTT server based on the criteria specified by the MCPTT client 1 while initiating the call.
Step 2.
The MCPTT server 1 detects that MCPTT client 3 now meets criteria and successfully added to call.
Step 3.
The MCPTT server 1 detects that MCPTT client 2 does not meet criteria any more and successfully removed from a call.
Step 4.
The MCPTT server 2 detects that the MCPTT client 5 meets the criteria specified by the MCPTT client 1.
Step 5.
The MCPTT server 2 sends the notification to MCPTT server 1 of the primary MCPTT system to add the MCPTT user at MCPTT client 5 to on-going ad hoc group call.
Step 6.
The MCPTT server 1 sends the ad hoc group call request to the MCPTT client 5.
Step 7.
The MCPTT client 5 notifies the user about the incoming ad hoc group call.
Step 8.
The MCPTT client 5 accepts the ad hoc group call request and sends the ad hoc group call response to the MCPTT server 1.
Step 9.
The on-going ad hoc group call is updated by adding MCPTT client 5 which meets the criteria specified by the MCPTT client 1.
Step 10.
The MCPTT server 2 detects that the MCPTT client 4 is no more satisfying the criteria to be the participant of the ad hoc group call.
Step 11.
The MCPTT server 2 sends the notification to MCPTT server 1 of the primary MCPTT system to remove the MCPTT user at MCPTT client 4 from on-going ad hoc group call.
Step 12.
The MCPTT server 1 sends the ad hoc group call leave request to the MCPTT client 4 and removes it from the on-going ad hoc group call.
Step 13.
The MCPTT client 4 notifies the user of the ad hoc group call leave request.
Step 14.
The MCPTT client 4 sends the ad hoc group call leave response to the MCPTT server 1.
Step 15.
The on-going ad hoc group call is updated by removing MCPTT client 4, which no more meets the criteria specified by the MCPTT client 1.
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10.19.3.2.5  Release ad hoc group call and stop determining the ad hoc group call participants by partner MCPTT system - Participants list determined by the MCPTT server  p. 255
Figure 10.19.3.2.5-1 below illustrates the release of ad hoc group call and stopping of MCPTT server at the partner MC system from determining the ad hoc group call participants' procedure once involving multiple MCPTT systems. This procedure, in particular describes about how the partner MC system is notified about ad hoc group call release to cease the determining of the participants by the partner MC system.
Pre-conditions:
  1. The MCPTT user at MCPTT client 1 is authorized to initate ad hoc group call.
  2. The MCPTT server 1 of the primary and MCPTT server 2 of the partner MCPTT systems determined the participants for the ad hoc group call based on the criteria specified by the MCPTT client 1 while initiating the ad hoc group call.
  3. The MCPTT server 1 of the primary and MCPTT server 2 of the partner MCPTT systems continuously evaluates the criteria to monitor the list of users who meets or not meets the criteria for participating in the on-going ad hoc group call.
Reproduction of 3GPP TS 23.379, Fig. 10.19.3.2.5-1: MCPTT server releases an ad hoc group call and stops the determination of ad hoc group call participants involving multiple MCPTT systems
Figure 10.19.3.2.5-1: MCPTT server releases an ad hoc group call and stops the determination of ad hoc group call participants involving multiple MCPTT systems
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Step 1.
The ad hoc group call is established and on-going with the participants MCPTT client 1, MCPTT client 2, MCPTT client 3, and MCPTT client 4. The participant list is determined by both primary and partner systems MCPTT server based on the criteria specified by the MCPTT client 1 while initiating the call.
Step 2.
The MCPTT server 1 detects that the ad hoc group call which is ongoing is to be released e.g., due to hang time expiry, last participant leaving, second last participant leaving, initiator leaving, or minimum number of affiliated MCPTT group members are not present.
Step 3a-3d.
The MCPTT server 1 sends ad hoc group call release request to all the participants of the ad hoc group call.
Step 3.
The MCPTT server 1 sends the notification to MCPTT server 2 of the partner MCPTT system about the ad hoc group call release to stop determining the participant list by MCPTT server 2 of the partner MCPTT system.
Step 4a-4d.
The MCPTT server 1 sends ad hoc group call release request to all the participants of the ad hoc group call.
Step 5a-5d.
The MCPTT clients notifies the user about the release of the ad hoc group call.
Step 5.
The MCPTT server 1 sends the notification to MCPTT server 2 of the partner MCPTT system about the ad hoc group call release to stop determining the participant list by MCPTT server 2 of the partner MCPTT system.
Step 6a-6d.
All the participants of the ad hoc group call receives the ad hoc group call release request and sends the ad hoc group call release response to the MCPTT server 1 of the primary MCPTT server.
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