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Content for  TS 23.280  Word version:  19.0.1

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10.10.2  Off-network emergency alertp. 230

10.10.2.1  Generalp. 230

The following subclauses specify the procedures for emergency alert initiation and emergency alert cancel that are utilised by the following MC services:
  • MCPTT
  • MCVideo
  • MCData

10.10.2.1A  Information flows |R18|p. 230

10.10.2.1A.1  MC service emergency alert announcementp. 230
Table 10.10.2.1A.1-1 describes the information flow for the MC service emergency alert announcement from the MC service client to the other MC service clients.
Information element Status Description
MC service IDMThe identity of the alerting MC service user.
MC service group IDMThe MC service group ID with which the alert is associated.
LocationOThe alerting client's location, if known.
Organization nameMThe alerting user's mission critical organization name.
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10.10.2.1A.2  MC service emergency alert cancel announcementp. 230
Table 10.10.2.1A.2-1 describes the information flow for the MC service emergency alert cancel announcement from the MC service client to other MC service clients.
Information element Status Description
MC service IDMThe identity of the cancelling MC service user.
MC service group IDMThe MC service group ID with which the alert is associated.
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10.10.2.2  MC service emergency alertp. 230

10.10.2.2.1  Emergency alert initiationp. 230
Figure 10.10.2.2.1-1 describes procedures for the MC service client initiating an MC service emergency alert with an MC service group.
This procedure will place the MC service client in the MC service emergency state if the MC service client is not already in that state.
Pre-conditions:
  1. The initiating MC service client 1 has been provisioned with an MC service group designated as the MC service emergency group.
  2. Information for ProSe direct communications corresponding to the MC service group and its mapping to ProSe Layer-2 Group ID are pre-configured in MC service client 1.
  3. MC service clients 2 and 3 belong to and are ready for off-network communications on the MC service group.
Reproduction of 3GPP TS 23.280, Fig. 10.10.2.2.1-1: Emergency alert initiation
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Step 1.
MC service client 1 sets its MC service emergency state. This MC service emergency state is retained by the MC service client until explicitly cancelled. Once MC service client1 is in the MC service emergency state, any communications initiated by MC service client 1, group or private, shall be initiated as emergency communications and shall receive priority treatment.
Step 2.
MC service client 1 sends an MC service emergency alert announcement to the other participants on the MC service emergency group. The MC service emergency alert announcement is sent periodically so that late joining MC service group members are notified.
Step 3.
MC service users are notified of the MC service emergency state of the originating MC service user.
Step 4.
The MC service clients upon receiving the emergency alert announcement message acknowledge the MC service emergency alert to the originating MC service client.
Step 5.
The originating MC service client 1 checks the responses and may inform the MC service user of the MC service group members whose MC service clients responded.
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10.10.2.2.2  Emergency alert cancelp. 232
An MC service client has initiated an MC service emergency alert, has entered the MC service emergency state and wishes to cancel the alert, informing the other MC service group members of the cancellation. As part of this process, the MC service client may also request the cancellation of the in-progress emergency state in the group if authorized to do so.
Procedures in Figure 10.10.2.2.2-1 describe procedures for the MC service client cancelling an MC service emergency alert.
Pre-conditions:
  1. The MC service client 1 has successfully initiated an MC service emergency alert and is in the MC service emergency state.
  2. Information for ProSe direct communications corresponding to the MC service group and its mapping to ProSe Layer-2 Group ID are pre-configured in MC service client 1.
  3. The initiating MC service client 1 and MC service clients 2 and 3 are still in off-network contact via the MC service group provisioned to MC service client 1 as for the MC service emergency group.
Reproduction of 3GPP TS 23.280, Fig. 10.10.2.2.2-1: Emergency alert cancel
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Step 1.
The user at the MC service client 1 initiates an MC service emergency alert cancel.
Step 2.
MC service client 1 sends an MC service emergency alert cancel announcement to the MC service group to which MC service client 1 had previously sent the emergency alert announcement message.
Step 3.
MC service users are notified of the MC service emergency alert cancellation by MC service client 1.
Step 4.
The receiving MC service clients acknowledge the MC service emergency alert cancel to the originating MC service client.
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