Figure 10.19.3.1.4-1 below illustrates the modification of ad hoc group call participants procedure by an authorized user.
Pre-conditions:
An ad hoc group call which is setup with participants list provided by the initiating MCPTT user as described in clause 10.19.3.1.1 or based on the criteria provided by the initiating MCPTT user as described in clause 10.19.3.1.3 is already in progress.
The participants of the MCPTT ad hoc group call belong to the single MCPTT system.
The MCPTT users on MCPTT client 1, MCPTT client 3 to MCPTT client n are on an ongoing ad hoc group call.
The MCPTT user at MCPTT client 1 determines to remove the user of MCPTT client 3 from the ad hoc group call and add user of MCPTT client 2 into the on-going ad hoc group call.
The MCPTT user at the MCPTT client 1 is authorized and requests to modify ad hoc group call participants. The MCPTT client 1 sends the modify ad hoc group call participants request to the MCPTT server in order to remove MCPTT client 3 from the ongoing ad hoc group call and add MCPTT client 2 into it.
The MCPTT server verifies whether the MCPTT client 1 is authorized to add or remove (modify) the participants of the on-going ad hoc group call regardless of the original group call setup parameters. When the group participants were initially determined by the MCPTT server with criteria and MCPTT users are to be removed, the MCPTT server removes MCPTT clients and marks them so that the MCPTT server will not add them back to the ad hoc group call based on the criteria. Participants to be added shall be marked and kept in the ad hoc group call and shall not be removed by the MCPTT server even if they do not meet the call criteria.
The MCPTT client 2 accepts the ad hoc group call request and send ad hoc group call responses to the MCPTT server. The response may also contain a functional alias of the responding MCPTT user, which is verified (valid and activated for the user) by the MCPTT server. The MCPTT server considers the MCPTT user as implicitly affiliated to the ad hoc group.
The MCPTT server may notify the initiating MCPTT user of all the users who are added to the on-going ad hoc group call. This notification may be sent to the initiating MCPTT user by the MCPTT server more than once during the call when MCPTT users join or leave the ad hoc group call.
Figure 10.19.3.1.5-1 below illustrates the modification of ad hoc group call participants procedure by the MCPTT server.
Pre-conditions:
The MCPTT client 1 is the initiator of the ad hoc group call.
MCPTT server 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.
MCPTT server 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.
The MCPTT server detects that the MCPTT client 5 satisfies the criteria and MCPTT client 4 stops to meet the criteria specified by the MCPTT client 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 participants list is determined by the MCPTT server based on the criteria specified by the MCPTT client 1 while initiating the call.
The MCPTT server detects that the MCPTT client 5 satisfies the criteria specified by the MCPTT client 1 and checks whether it has been previously removed by an authorized user as described in clause 10.19.3.1.4. If MCPTT client 5 has already been removed by an authorized user, the MCPTT server does not add the MCPTT client 5 back to the ad hoc group call and it skips step 3 to step 6. If MCPTT client 5has not been already removed by an authorized user, the procedure continues with step 3.
The MCPTT server detects that the MCPTT client 4 is no more satisfying the criteria to be the participant of the ad hoc group call and checks whether it has been previously added by an authorized user as described clause 10.19.3.1.4. If MCPTT client 4 has already been added by an authorized user, the MCPTT server does not remove it from the ad hoc group call and skips step 8 to step 11. If MCPTT client 4 has not been already added by an authorized user, the procedure continues with step 8.
The MCPTT user at the MCPTT client 1 is authorized and requests to modify the criteria for determining the list of participants. The MCPTT client 1 sends the modify ad hoc group call criteria request to the MCPTT server which contains an updated criteria to determine the list of participants.
The MCPTT server verifies whether the MCPTT client 1 is authorized to modify the criteria which determines the list of participants during on-going ad hoc group voice communication. The MCPTT server determines the list of ad hoc group call participants based on the criteria provided and the added/removed participant by the authorized user as marked in clause 10.19.3.1.4.
If MCPTT client 3 satisfies the new criteria to be removed and
has been already added by an authorized user, the MCPTT server does not remove it from the call and skips the step 4 to step 6.
has not been already added by an authorized user, the procedure continues with step 4.
If MCPTT client 2 satisfies the new criteria to be added and
has been previously removed by an authorized user, the MCPTT server does not add it back to the call and skips the step 7 to step 9.
has not been already removed by an authorized user, the procedure continues with step 4.
Depending on the criteria provided and based on local policy, the MCPTT server may modify the content of the criteria received in step 1 to determine the list of participants.
The MCPTT server sends modify ad hoc group call criteria response containing the call resulting criteria used by the MCPTT server to determine the list of participants to be invited to MCPTT client 1.
The MCPTT client 2 accepts the ad hoc group call request and send ad hoc group call responses to the MCPTT server. The response may also contain a functional alias of the responding MCPTT user, which is verified (valid and activated for the user) by the MCPTT server. The MCPTT server considers the MCPTT user as implicitly affiliated to the ad hoc group.
The MCPTT server may notify the initiating MCPTT user of all the users who are added to the on-going ad hoc group call. This notification may be sent to the initiating MCPTT user by the MCPTT server more than once during the call when MCPTT users join or leave the ad hoc group call. All ad hoc group call notify messages contain the call resulting criteria used by the MCPTT server to determine the list of participants to be invited.
The MCPTT server may notify the participants about the change in the participants list of on-going ad hoc group call. All ad hoc group call notify messages contain the call resulting criteria used by the MCPTT server to determine the list of participants to be invited.
The MCPTT server continuously checks whether other MCPTT clients meet or if participating MCPTT clients no longer meet the criteria for the ad hoc group emergency call.