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Content for  TS 23.281  Word version:  19.1.0

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1…   5…   6…   7…   7.1.2.3…   7.1.2.3.1.2…   7.1.2.3.2…   7.1.2.4…   7.1.2.5.2…   7.1.3…   7.2…   7.2.2.3…   7.2.2.4…   7.2.3…   7.3…   7.4…   7.4.3…   7.5…   7.5.2.3…   7.6…   7.7…   7.7.1.3…   7.7.1.3.2A…   7.7.1.3.4…   7.7.1.3.6…   7.7.2…   7.7.2.7…   7.7.2.9…   7.8…   7.11…   7.17…   7.19…   7.19.2.8…   7.19.3…   7.19.3.1.4…   7.19.3.2…   7.19.3.2.3…   7.19.3.2.6…   A… 
7.1.2.4 Broadcast group call  7.1.2.4.1 General  7.1.2.4.2 Common broadcast group call procedure  7.1.2.5 Emergency and imminent peril procedures  7.1.2.5.1 MCVideo emergency group call  7.1.2.5.1.1 MCVideo emergency group call commencement  7.1.2.5.1.2 MCVideo group call upgraded to an MCVideo emergency group call  7.1.2.5.1.3 MCVideo in-progress emergency group state cancel 
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7.1.2.4  Broadcast group call  p. 42

7.1.2.4.1  General  p. 42
A broadcast group call is a special group call where the initiating MCVideo user expects no response from the other MCVideo users, i.e. no response from the recipients is required to start media transmission and the call ends when the media transmission is complete.
7.1.2.4.2  Common broadcast group call procedure  p. 42
Only the call originator can transmit media during the broadcast group call and the broadcast group call is released when the transmission is complete.
Figure 7.1.2.4.2-1 illustrates the common procedure both for broadcast group call on group-broadcast group, user-broadcast group, broadcast regrouped group, and pre-arranged groups.
Pre-condition:
  1. MCVideo client 1 and MCVideo client 2 are members of a group-broadcast group/user-broadcast group.
Reproduction of 3GPP TS 23.281, Fig. 7.1.2.4.2-1: Broadcast group call
Figure 7.1.2.4.2-1: Broadcast group call
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Step 1.
MCVideo user at MCVideo client 1 initiates the broadcast group call setup procedure with the indication of broadcast group call. The signalling procedure is identical to the group call setup as described in subclause 7.1.2.3.1.1 with the inclusion of the parameter for broadcast group call indicator.
Step 2.
MCVideo client 1 starts to transmit media.
Step 3.
If the media transmission from call originating MCVideo user is complete, the broadcast group call is released.
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7.1.2.5  Emergency and imminent peril procedures  p. 43

7.1.2.5.1  MCVideo emergency group call  p. 43
7.1.2.5.1.1  MCVideo emergency group call commencement  p. 43
The procedure describes the case where an MCVideo client is initiating an MCVideo emergency group call with the affiliated MCVideo group members of that MCVideo group. An MCVideo client in the MCVideo emergency state gains elevated access privilege for all of the MCVideo user's mission critical applications. Initiating an MCVideo emergency group call puts the MCVideo group into the in-progress emergency state. While in the in-progress emergency state, all MCVideo group calls in the MCVideo group are processed as MCVideo emergency group calls by the MCVideo server until the emergency state of the MCVideo group is cancelled.
Figure 7.1.2.5.1.1-1 shows the procedures for the MCVideo client initiating establishment of an MCVideo emergency group call with an MCVideo group i.e., MCVideo users on MCVideo client 1, MCVideo client 2 and MCVideo client 3 belong to the same MCVideo group which is defined on group management server.
Pre-conditions:
  1. The MCVideo group is previously defined on the group management server with MCVideo client 2 and MCVideo client 3 affiliated to that MCVideo group.
  2. All members of the MCVideo group belong to the same MC system.
  3. The initiating MCVideo client 1 has been provisioned with an MCVideo group that has been designated via provisioning as the MCVideo emergency group.
  4. MCVideo client 1, MCVideo client 2 and MCVideo client 3 may have an activated functional alias to be used during the emergency group communication.
  5. The MCVideo server may have subscribed to the MCVideo functional alias controlling server within the MC system for functional alias activation/de-activation updates.
Reproduction of 3GPP TS 23.281, Fig. 7.1.2.5.1.1-1: MCVideo emergency group call
Figure 7.1.2.5.1.1-1: MCVideo emergency group call
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Step 1.
The user at the MCVideo client 1 initiates an MCVideo emergency group call. MCVideo client 1 sets its MCVideo emergency state. The MCVideo emergency state of MCVideo client 1 is retained until explicitly cancelled by the user of MCVideo client 1.
Step 2.
MCVideo client 1 sends an MCVideo emergency group call request towards the MCVideo server. The MCVideo user at MCVideo client 1 may include a functional alias used within the MCVideo emergency group call request. The request contains an indication of the MCVideo emergency. The MCVideo server records the identity of the MCVideo user that initiated the MCVideo emergency group call until the MCVideo emergency state of the group is cancelled. Once an MCVideo emergency call has been initiated, the MCVideo group is considered to be in an in-progress emergency state until the emergency state of the group cancelled. If configured to send an MCVideo emergency alert when initiating an MCVideo emergency group call, the request also contains an indication that an MCVideo emergency alert is to be initiated. The request may contain an indication of an implicit transmit media request.
Step 3.
The MCVideo server implicitly affiliates MCVideo client 1 to the emergency group if the client is not already affiliated.
Step 4.
MCVideo server checks whether the provided functional alias is allowed to be used and has been activated for the MCVideo user, and whether the MCVideo user of MCVideo client 1 is authorized for initiation of MCVideo emergency calls on the indicated MCVideo group, and if authorized, it resolves the MCVideo group ID to determine the members of that MCVideo group and their affiliation status, based on the information from group management server.
Step 5.
The MCVideo server configures the priority of the underlying bearers for all participants in the MCVideo group.
Step 6.
MCVideo server sends the MCVideo emergency group call request towards the MCVideo clients of each of those affiliated MCVideo group members. The request contains an indication of the in-progress emergency. The request contains an indication of an MCVideo emergency alert if the request from the originator indicated MCVideo emergency alert.
Step 7.
MCVideo users are notified of the incoming MCVideo group call, and, if available, the functional alias of the initiating user is displayed.
Step 8.
The receiving MCVideo clients send the MCVideo emergency group call response to the MCVideo server to acknowledge the MCVideo emergency group call request. For a multicast call, these acknowledgements are not sent.
Step 9.
The MCVideo server sends the MCVideo emergency group call response to the MCVideo user 1 to inform the successful MCVideo emergency call establishment.
MCVideo client 1, MCVideo client 2 and MCVideo client 3 have successfully established media plane for communication. MCVideo transmission control participant 1, transmission control participant 2 and transmission control participant 3 exchange transmission control information e.g., MCVideo client 1 receives the transmit media granted information over the established media plane, while the other MCVideo client's receive media available notification with forced reception information. MCVideo client 1 indicates to the MCVideo user that the permission is granted to transmit media, while the other MCVideo clients in the MCVideo emergency group call will be receiving that media. MCVideo client 1 can override other clients in the call except those that are also in the MCVideo emergency state.
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7.1.2.5.1.2  MCVideo group call upgraded to an MCVideo emergency group call  p. 45
The procedure describes the case where an authorized MCVideo user is upgrading an MCVideo group call to an MCVideo emergency group call while the MCVideo group call is already in progress.
Procedures in Figure 7.1.2.5.1.2-1 are the signalling control plane procedures for the MCVideo client upgrading an MCVideo group call on an MCVideo group to an MCVideo emergency group call.
Pre-conditions:
  1. The MCVideo group is previously defined on the group management server with MCVideo client 2 and MCVideo client 3 affiliated to that MCVideo group.
  2. All members of the MCVideo group belong to the same MC system.
  3. An MCVideo group call is already in progress.
  4. The initiating MCVideo client 1 has been configured to send an MCVideo emergency alert when upgrading an MCVideo emergency group call.
Reproduction of 3GPP TS 23.281, Fig. 7.1.2.5.1.2-1: MCVideo group call upgraded to an MCVideo emergency group call
Figure 7.1.2.5.1.2-1: MCVideo group call upgraded to an MCVideo emergency group call
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Step 1.
The MCVideo user at MCVideo client 1 initiates a group emergency. MCVideo client 1 sets its MCVideo emergency state. The MCVideo emergency state of MCVideo client 1 is retained until explicitly cancelled by the user of MCVideo client 1.
Step 2.
MCVideo client 1 requests the MCVideo server to upgrade the MCVideo group to an in-progress emergency state by sending an MCVideo emergency group call request. If configured to send an MCVideo alert when initiating an MCVideo emergency upgrade, the request also contains an indication that an MCVideo alert is to be initiated. The request may contain an indication of an implicit transmit media request.
Step 3.
The MCVideo server adjusts the priority of the underlying bearer for all participants in the MCVideo group.
Step 4.
MCVideo server sends the MCVideo emergency group call request towards the MCVideo clients of each of those affiliated MCVideo group members. The request contains an indication of an MCVideo emergency alert if the request from the originator indicated MCVideo emergency alert.
Step 5.
MCVideo users are notified of the in-progress emergency state of the MCVideo group.
Step 6.
The receiving MCVideo clients send the MCVideo emergency group call response to the MCVideo server to acknowledge the MCVideo group emergency request. For a multicast call, these acknowledgements are not sent.
Step 7.
The MCVideo server sends the MCVideo emergency group call response to the MCVideo user 1 to confirm the upgrade request. If the MCVideo emergency request contained an implicit transmit media request, the OK message contains the result of the implicit transmit media request.
MCVideo client 1, MCVideo client 2 and MCVideo client 3 continue with the MCVideo group call, which has been transformed into an MCVideo emergency group call. MCVideo client 1 can override other clients in the call except those that are also in the MCVideo emergency state.
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7.1.2.5.1.3  MCVideo in-progress emergency group state cancel  p. 47
The procedure describes the case where an MCVideo client cancels an MCVideo group's in-progress emergency state. The emergency state of the group may alternatively be cancelled by the emergency alert cancellation procedure specified in subclause 10.10.1.2.2.2 of TS 23.280.
Procedures in Figure 7.1.2.5.1.3-1 are the signalling control plane procedures for the MCVideo client cancelling an in-progress emergency of a group.
Pre-conditions:
  1. The MCVideo group is previously defined on the group management server with MCVideo client 2 and MCVideo client 3 affiliated to that MCVideo group.
  2. All members of the MCVideo group belong to the same MC system.
  3. MCVideo group members have been notified about the in-progress emergency.
  4. The MCVideo group is in the in-progress emergency state and has prioritized bearer support.
  5. MCVideo client 1 previously initiated the in-progress emergency for the group.
Reproduction of 3GPP TS 23.281, Fig. 7.1.2.5.1.3-1: MCVideo in-progress emergency group state cancel
Figure 7.1.2.5.1.3-1: MCVideo in-progress emergency group state cancel
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Step 1.
The user at the MCVideo client 1 initiates an MCVideo in-progress emergency group state cancel.
Step 2.
MCVideo client 1 sends an MCVideo in-progress emergency group state cancel request to the MCVideo server.
Step 3.
MCVideo server resolves the MCVideo group ID to determine the members of that MCVideo group and their affiliation status, based upon the information from group management server.
Step 4.
The MCVideo server adjusts the priority of the underlying bearer; priority treatment is no longer required. The MCVideo server cancels/resets the emergency in-progress state of the MCVideo group.
Step 5.
The MCVideo server sends an MCVideo in-progress emergency group state cancel request to the MCVideo group members.
Step 6.
MCVideo group members are notified of the MCVideo in-progress emergency group state cancel.
Step 7.
The receiving MCVideo clients send the MCVideo in-progress emergency group state cancel response to the MCVideo server to acknowledge the MCVideo in-progress emergency group state cancel. For a multicast call scenario, these acknowledgements are not sent.
Step 8.
The MCVideo server sends the MCVideo in-progress emergency group state cancel response to the MCVideo user 1 to confirm the MCVideo in-progress emergency group state cancel. If the MCVideo in-progress emergency group state cancel request (in step 2) contained the "Alert indicator" IE, the MCVideo client 1 resets its local emergency status.
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