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Content for  TS 23.379  Word version:  17.5.0

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10.6.2.7 Location of current talker  10.6.2.8 Temporary group call - user regroup 
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10.6.2.7  Location of current talker

Figure 10.6.2.7-1 shows the high level procedure to for MCPTT service to provide the location information about the current talking user to all the receiving MCPTT users.
Precondition:
  1. There is on-going group call involving MCPTT client 1 and MCPTT client 2.
  2. MCPTT client 1 is the current talking user.
  3. MCPTT server has obtained the location information of MCPTT client 1 according to subclause 10.9 in TS 23.280.
(not reproduced yet)
Figure 10.6.2.7-1: Providing location information of the current talker
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Step 1.
MCPTT client 1 gets the floor to transmit voice media.
Step 2.
MCPTT server checks the privacy policy (authorisation to provide location information to other MCPTT users on a call when talking, as defined in Annex A.3) of the current talking MCPTT user to decide if the location information of MCPTT client 1 can be provided to other MCPTT users on the call. MCPTT server acquires the location of the current talker from the location management server as described in subclause 10.9.3.6 of TS 23.280. Optionally, the MCPTT server acquires the location of the current talker directly from the floor request received from MCPTT client 1 in step 1.
Step 3.
MCPTT server provides the location information of MCPTT client 1 to MCPTT client 2. Optionally, the location information may be provided in the floor taken message sent to MCPTT client 2 according to subclause 10.9.1.3.1.
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10.6.2.8  Temporary group call - user regroup |R17|  Word‑p. 97
10.6.2.8.1  General
The temporary group call performed by user regroup can be initiated by an authorized user inviting a list of MCPTT users. The group ID for this temporary group may be obtained during call setup, or prior to call setup. The users being invited are implicitly affiliated to this temporary group during call setup, and can be implicitly de-affiliated with the release of the group call. The group call is terminated by either the MCPTT server releasing the call or the authorized user ending the call. The release of the call may be followed by release of the temporary group ID.
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10.6.2.8.2  Group call setup
Figure 10.6.2.8.2-1 below illustrates the group call setup procedure initiated by an authorized user.
Pre-conditions:
  1. The authorized user is aware of the MCPTT users who will be invited to the temporary group call.
  2. The MCPTT server is allowed to perform implicit affiliation/de-affiliation operation for this type of group call based on relevant configurations.
  3. The MCPTT users being invited have relevant configurations that allow them to be implicitly affiliated for this type of group call.
  4. A group ID may be available prior to group call setup.
(not reproduced yet)
Figure 10.6.2.8.2-1: Group call setup for temporary group call - user regroup
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Step 1.
MCPTT client 1 (of an authorized user) initiates the group call by sending the group call request to the MCPTT server.
Step 2.
The MCPTT server checks whether the MCPTT client 1 can initiate the group call.
Step 3.
The MCPTT server implicitly affiliates the clients to the group.
Step 4.
The MCPTT server sends the group call requests towards the MCPTT clients. The message contains the temporary group indicator.
Step 5.
The receiving MCPTT clients are notified about the incoming group call. The users verify they are authorized to participate in the temporary group call.
Step 6.
The receiving MCPTT clients accept the group call requests and send group call responses to the MCPTT server. This response may contain an acknowledgement. The conditions for sending acknowledgement may be based on configuration.
Step 7.
The MCPTT server sends the group call response to MCPTT client 1 through the signalling path to inform about successful call establishment.
Step 8.
MCPTT client 1, client 2 and client 3 establish media plane and floor control resources.
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10.6.2.8.3  Group call end (by authorized user)  Word‑p. 98
Figure 10.6.2.8.3-1 below illustrates the group call end requested by the authorized user.
Pre-conditions:
  1. The MCPTT server is allowed to perform implicit affiliation/de-affiliation operation for this type of group call.
  2. MCPTT users on MCPTT client 1, client 2 and client 3 are already part of the ongoing temporary group call.
(not reproduced yet)
Figure 10.6.2.8.3-1: Group call end (by authorized user) for temporary group call - user regroup
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Step 1.
The MCPTT client 1 (of an authorized user) requests to end the group call by sending group call release request to MCPTT server.
Step 2.
The MCPTT server checks whether the MCPTT client 1 can end the group call.
Step 3.
In this optional step the MCPTT server resolves the MCPTT group ID to determine the members of the group based upon the information from group management server.
Step 4.
The MCPTT server sends group call release requests to MCPTT clients of the group members.
Step 5.
The MCPTT clients are notified about the group call release.
Step 6.
The MCPTT clients send the group call release responses to MCPTT server to acknowledge the group call release. For a multicast call scenario, these acknowledgements are not sent.
Step 7.
The MCPTT server sends the group call release response to MCPTT client 1 to confirm the call is released.
Step 8.
MCPTT client 1, client 2 and client 3 released the floor control and media plane resources associated with the group call.
Step 9.
MCPTT server implicitly de-affiliates MCPTT clients to the group. The group management server releases the temporary group ID. This step is optional.
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