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Content for  TS 23.379  Word version:  19.0.0

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10.6.2.10  User regroup using group creation procedure |R16|p. 111

10.6.2.10.1  Generalp. 111
User regroup using the group creation procedure can be initiated by an authorized user creating a temporary group with a list of MCPTT users. The group ID for this temporary group can be provided at the time of group creation. The temporary group can be used by all MCPTT users in the list for two-way (non-broadcast) communication until deleted by an authorized user. Optionally, the group can be used for one-way (broadcast ) communication where the creator of the temporary group can make a broadcast group call, but the other MCPTT users can only listen to the group call and cannot respond.
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10.6.2.10.2  Temporary group creation and broadcast group call by authorized userp. 111
Figure 10.6.2.10.2-1 below illustrates the temporary group creation, and optional broadcast call setup procedure and temporary group deletion initiated by an authorized user.
Pre-conditions:
  1. The authorized user is aware of the MCPTT users who will be included in the temporary group.
Reproduction of 3GPP TS 23.379, Fig. 10.6.2.10.2-1: User regroup using group creation procedure
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Step 1.
The authorized user of MCPTT UE 1 makes use of the group management client of MCPTT UE 1 to create the temporary group according to the group creation procedure in subclause 10.2.3 of TS 23.280. The configuration identifies the group as a temporary group. As part of this procedure, the MCPTT users are notified of their membership to the temporary group, and the MCPTT server is notified about the creation of the group and the list of group members. Alternatively, the MCPTT client 1 (not shown in the figure) on MCPTT UE 1 can provide the criteria which allows the MCPTT server to determine the list of MCPTT users to be regrouped.
The authorized user can create the group as a broadcast group by configuring it as a broadcast group.
Step 2.
The creator of the temporary group, the authorized user of MCPTT UE 1, initiates a broadcast group call according to the procedure described in subclause 10.6.2.5.2 of the present document. The authorized user of MCPTT UE 1 is implicitly affiliated to the temporary group. The receiving MCPTT clients of MCPTT UEs 2 and 3 are implicitly affiliated to the group and are notified of this affiliation during the call setup.
Step 3.
The authorized user of MCPTT UE 1 ends the use of the temporary group according to the procedure for group deletion described in TS 23.280.
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10.6.2.10.3  Temporary group deletion by authorized userp. 112
If the authorized user wishes to end the use of the temporary group, the procedure for group deletion described in TS 23.280 is followed.

10.6.2.11  Broadcast group regroup call using preconfigured group |R16|p. 112

10.6.2.11.1  Generalp. 112
The temporary group created using a preconfigured group can be a broadcast group or a non-broadcast group. The broadcast regroup is used for one-way communication where only an authorized MCPTT user is allowed to transmit and all other regroup members are only allowed to receive the communication (e.g. a call from a dispatcher to all regroup members). The non-broadcast regroup is used for two-way communication where all regroup members can transmit and receive (i.e. the regroup group call behaves like a normal non-broadcast group call). The broadcast regroup satisfies the temporary group-broadcast group requirements defined in TS 22.280.
A broadcast group regroup call using preconfigured groups can be achieved by first regrouping MCPTT groups into an MCPTT regroup group, making the broadcast group call on the regroup group, and then cancelling the preconfigured group regroup.
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10.6.2.11.2  Broadcast group regroup call procedure using preconfigured group in a single MCPTT systemp. 112
The broadcast group regroup call procedure using preconfigured group allows an authorized MCPTT user to initiate a broadcast call to a set of MCPTT groups, which are regrouped only for the duration of the broadcast call. The regroup is cancelled at the end of the broadcast call to prevent users from talking back on the regroup group. This procedure requires that the authorized MCPTT user is a group member of at least one of the MCPTT groups included in the regroup operation.
Figure 10.6.2.11.2-1 illustrates the procedure to initiate a broadcast group regroup call using a preconfigured MCPTT group.
Pre-conditions:
  • MCPTT clients 1, 2, and 3 are registered with the MCPTT service.
  • The group configuration for the MCPTT regroup group have been preconfigured in MCPTT clients 1, 2, and 3, and MCPTT clients 1, 2 and 3 have received the relevant security related information to allow them to communicate in the regroup MCPTT group.
  • MCPTT client 1 is authorized to initiate a group regroup using the preconfigured regroup procedure.
  • MCPTT client 1 is aware of a suitable preconfigured group whose configuration has been preconfigured in the MC service UEs of the MCPTT users who will be regrouped.
  • MCPTT client 1 is affiliated to group 1, MCPTT client 2 is affiliated to group 2, and MCPTT client 3 is affiliated to group 3. Group 4 is used as the regroup group.
Reproduction of 3GPP TS 23.379, Fig. 10.6.2.11.2-1: Broadcast group regroup call using preconfigured group in a single MCPTT system
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Step 1.
The authorized user of MCPTT client 1 initiates the group regroup formation procedure using preconfigured groups as specified in clause 10.6.2.9.2.1. MCPTT groups 1, 2, and 3 are regrouped into group 4.
Step 2.
The MCPTT user at MCPTT client 1 performs the broadcast group call procedure as specified in clause 10.6.2.5.2.
Step 3.
If the broadcast group call is made on the regroup group 4, the MCPTT client 1 initiates the preconfigured group regroup cancellation procedure as specified in clause 10.6.2.9.2.2.
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10.6.2.12  User regroup with preconfigured group |R16|p. 113

10.6.2.12.1  Generalp. 113
A user regroup may be achieved by regrouping MCPTT users into a new regroup group which uses the configuration of a separate preconfigured MCPTT group. The MCPTT regroup group configuration needs to be provided to the relevant MCPTT users who will be regrouped in advance of the regrouping operation. User regroup with preconfigured group satisfies user regroup requirements in TS 22.280, particularly [R-6.6.4.2-003].
The preconfigured MCPTT group that provides the configuration is not used as the MCPTT regroup group itself, it only provides configuration for one or more MCPTT regroup groups. The MCPTT group ID of the regroup group is provided by the authorized user when the preconfigured regrouping is carried out.
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10.6.2.12.2  User regroup procedures in a single MCPTT systemp. 113
10.6.2.12.2.1  User regroup formation in a single MCPTT systemp. 113
Figure 10.6.2.12.2.1-1 illustrates the procedure to initiate a user regroup procedure using a preconfigured MCPTT group. The procedure takes place prior to the establishment of a group call to the MCPTT regroup group.
Pre-conditions:
  • MCPTT clients 2 and 3 are registered with the MCPTT service.
  • An MCPTT group that will be used for configuration of the temporary user regroup group has been preconfigured in MCPTT clients 2 and 3, and MCPTT clients 2 and 3 have received the relevant security related information to allow them to communicate in the temporary user regroup group.
  • MCPTT client 1 is authorized to initiated a user regroup using the preconfigured regroup procedure.
  • MCPTT client 1 is aware of a suitable preconfigured group whose configuration has been preconfigured in the MCPTT UEs of the MCPTT users who will be regrouped.
Reproduction of 3GPP TS 23.379, Fig. 10.6.2.12.2.1-1: User regroup procedure using preconfigured group in single MCPTT system
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Step 1.
The authorized user of MCPTT client 1 initiates the user regroup procedure, specifying the list of MCPTT users to be regrouped (MCPTT clients 2 and 3), the MCPTT group ID of the regroup group (if available), and the MCPTT group ID of the group from which configuration information for the regroup group is to be taken. Alternatively, the MCPTT client 1 can provide the criteria which allows the MCPTT server to determine the list of MCPTT users to be regrouped.
Step 2.
MCPTT client 1 sends the preconfigured regroup request to the MCPTT server. The request indicates the list of users to be included in the regroup operation.
Step 3.
The MCPTT server checks that MCPTT client 1 is authorized to initiate a preconfigured regroup procedure. If the preconfigured regroup request is authorized, the MCPTT server assigns a MCPTT group ID for this regroup group call if:
  1. one is not provided in the request or
  2. the one provided in the request is not accepted.
Step 4.
The MCPTT server shall send the preconfigured regroup request return message to MCPTT client 1 containing the below:
  1. the MCPTT group ID is generated by the MCPTT server; and
  2. result of whether the ad hoc group call is authorized or not
If the preconfigured regroup request is not authorized, MCPTT client 1 shall not proceed with the rest of the steps.
Step 5.
The MCPTT server sends the preconfigured regroup requests to MCPTT clients 2 and 3 in steps 4a and 4b respectively.
Step 6.
MCPTT clients 2 and 3 notify their users of the regrouping in steps 5a and 5b respectively.
Step 7.
MCPTT clients 2 and 3 may send the preconfigured regroup response to the MCPTT server to acknowledge the regrouping action. These acknowledgements are not sent in response to a multicast transmission of the preconfigured regroup request.
Step 8.
The MCPTT server affiliates the regrouped MCPTT clients to the regroup group.
Step 9.
The MCPTT server sends a preconfigured regroup response to MCPTT client 1.
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10.6.2.12.2.2  User regroup cancellation in single MCPTT systemp. 115
Figure 10.6.2.12.2.2-1 illustrates the procedure to cancel a user regrouping that uses a preconfigured MCPTT group.
Pre-conditions:
  • MCPTT clients 2 and 3 have been regrouped into an MCPTT regroup group.
  • MCPTT client 1 is authorized to cancel a user regrouping that uses a preconfigured MCPTT group.
Reproduction of 3GPP TS 23.379, Fig. 10.6.2.12.2.2-1: Cancel preconfigured user regroup procedure in single MCPTT system
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Step 1.
The authorized user of MCPTT client 1 initiates the cancellation of the user regrouping that uses a preconfigured MCPTT group.
Step 2.
MCPTT client 1 sends the preconfigured regroup cancel request to the MCPTT server, specifying the MCPTT group ID of the regroup group.
Step 3.
The MCPTT server checks that MCPTT client 1 is authorized to cancel a regrouping that uses a preconfigured user regroup procedure.
Step 4.
The MCPTT server sends the preconfigured regroup cancel requests to MCPTT clients 2 and 3 (steps 4a and 4b respectively).
Step 5.
MCPTT clients 2 and 3 notify their users of the cancellation of the user regrouping in steps 5a and 5b respectively.
Step 6.
MCPTT clients 2 and 3 may send the preconfigured regroup cancel response to the MCPTT server to acknowledge the cancellation of the regrouping function. These acknowledgements are not sent in response to a multicast transmission of the preconfigured regroup cancel request.
Step 7.
The MCPTT server de-affiliates MCPTT clients 2 and 3 from the MCPTT regroup group.
Step 8.
The MCPTT server sends a preconfigured regroup cancel response to MCPTT client 1.
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10.6.2.12.3  User regroup MCPTT ID list update |R19|p. 116
Figure 10.6.2.12.3-1 illustrates the procedure to add or remove an MCPTT user based on the MCPTT user criteria known at the MC service server.
Preconditions:
  • A preconfigured regroup group has been established.
  • The MCPTT server has selected MCPTT user 2 to participate in the preconfigured regroup group based on MCPTT user criteria known at the MCPTT server.
Reproduction of 3GPP TS 23.379, Fig. 10.6.2.12.3-1: Procedure to update the MCPTT ID list
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Step 1.
The MCPTT server detects that MCPTT client 2, which has been earlier included in the preconfigured regroup group, no longer meets the MCPTT user criteria known at the MCPTT server.
Step 2.
The MCPTT server sends MCPTT client 2 a preconfigured user regroup remove request.
Step 3.
The MCPTT client 2 notifies the MCPTT user of the preconfigured user regroup removal.
Step 4.
The MCPTT client 2 may send the MCPTT server a preconfigured user regroup remove response to acknowledge the preconfigured user regroup removal.
Step 5.
The MCPTT server updates the preconfigured regroup group (including the MCPTT user ID list) and potential group communication.
Step 6.
The MCPTT server detects that the MCPTT client 3 meets the MCPTT user criteria.
Step 7.
The MCPTT server sends the MCPTT client 3 a preconfigured regroup request.
Step 8.
The MCPTT client 3 notifies the MCPTT user of the preconfigured regroup request.
Step 9.
The MCPTT client 3 may send the MCPTT server a preconfigured regroup response.
Step 10.
The MCPTT server updates the preconfigured regroup group (including the MCPTT ID list), and potential group communication.
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