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Content for  TS 23.280  Word version:  19.0.1

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10.10.1.2.3  Entering MC service emergency alert area |R16|p. 227
The procedure focuses on the case where an MC service emergency alert to be triggered when an MC service UE moves into a pre-defined area. 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.
Procedures in Figure 10.10.1.2.3-1 are the signalling control plane procedures for the MC service server triggering an MC service emergency alert with an MC service group i.e., MC service users on MC service client 1, MC service client 2 and MC service client 3 belong to the same MC service group which is defined on MC service group management server. 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 MC service group is previously defined on the group management server with MC service client 2 and MC service client 3 affiliated to that MC service group.
  2. All members of the MC service group belong to the same MC system.
  3. An area in which the MC service client should send emergency alert is pre-defined in MC service server.
Reproduction of 3GPP TS 23.280, Fig. 10.10.1.2.3-1: Entering MC service emergency alert area
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Step 1.
MC service server acquires the latest location information of user at MC service client 1 from location management server as described in clause 10.9.3.6.
Step 2.
MC service server checks whether MC service client 1 has moved into a pre-defined area.
Step 3.
If so, MC service server sends an MC service emergency alert area notification to MC service client 1 to notify that it has moved into the area in potential danger.
Step 4.
MC service client 1 notifies the MC service user about the MC service emergency alert area.
Step 5.
MC service client 1 initiates MC service emergency alert procedure as described in clause 10.10.1.2.1.
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10.10.1.2.4  Leaving MC service emergency alert area |R16|p. 229
This procedure focuses on the case where a notification is sent when an MC service UE moves out of a pre-defined area. This procedure will notify the MC service client that it is now out of the pre-defined emergency alert area. It is up to the MC service user at that MC service client to determine if the emergency state is to be cleared or not.
Procedures in Figure 10.10.1.2.4-1 are the signalling control plane procedures for the MC service server sends an MC service emergency alert area notification. It is optional if the MC service user wants to initiate the MC service emergency alert cancel procedure to inform the members in the MC service group that its emergency condition is over.
Pre-conditions:
  1. The MC service group is previously defined on the group management server with MC service client 2 and MC service client 3 affiliated to that MC service group. This MC service group has been pre-defined for communicating the emergency alert in the user profile.
  2. All members of the MC service group belong to the same MC system.
  3. An area in which the emergency alert for the MC service client should remain active is pre-defined in MC service server.
Reproduction of 3GPP TS 23.280, Fig. 10.10.1.2.4-1: Leaving MC service emergency alert area
Up
Step 1.
MC service server acquires the latest location information of user at MC service client 1 from location management server as described in subclause 10.9.3.6.
Step 2.
MC service server checks whether MC service client 1 has moved out a pre-defined area.
Step 3.
If so, MC service server sends an MC service emergency alert area notification to MC service client 1 to notify that it has moved out of the area in potential danger.
Step 4.
MC service client 1 notifies the MC service user about the MC service emergency alert area cancel. It is up to the MC service user at the MC service client 1 to determine if the emergency state is clear.
Step 5.
Optionally, the MC service user of MC service client 1 initiates MC service emergency alert cancel procedure as described in clause 10.10.1.2.2.
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