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Content for  TS 23.434  Word version:  18.2.0

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10.3.3  Group creationp. 75

Figure 10.3.3-1 below illustrates the group creation operations by authorized VAL user/UE/administrator to create a group. It applies to the scenario of normal group creation by a VAL administrator or by authorized user/UE.
Pre-conditions:
  1. The group management client, group management server, VAL server and the VAL group members belong to the same VAL system.
  2. The authorized VAL user/UE/administrator is aware of the users' identities which will be combined to form the VAL group.
Reproduction of 3GPP TS 23.434, Fig. 10.3.3-1: Group creation
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Step 1.
The group management client of the authorized VAL user/UE/administrator requests group create operation to the group management server. The identities of the users or UEs being combined and the information of the VAL services that are enabled on the group shall be included in this message.
Step 2.
During the group creation, the group management server creates and stores the information of the group. The group management server performs the check on the policies e.g. maximum limit of the total number of VAL group members for the VAL group(s). The external group identifier, identifying the member UEs of the VAL group at the 3GPP core network, is stored in the newly created VAL group's configuration information.
Step 3.
The group management server may conditionally notify the VAL server regarding the group creation with the information of the group members.
Step 4.
The VAL group members of the VAL group are notified about the newly created VAL group configuration data.
Step 5.
The group management server provides a group creation response to the group management client of the administrator/authorized VAL user/UE.
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10.3.4  Group information queryp. 76

10.3.4.1  Generalp. 76

A VAL user/UE can request the membership list on an VAL group regardless the user or UE's group membership.

10.3.4.2  Procedurep. 76

Figure 10.3.4.2-1 below illustrates the group information query on a VAL group.
Reproduction of 3GPP TS 23.434, Fig. 10.3.4.2-1: Group information query
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Step 1.
The group management client of the VAL user/UE requests the group information on the VAL group from the group management server by sending a group information query request. The query type is included.
Step 2.
The group management server checks whether the VAL user/UE is authorized to perform the query. If authorized, then the group management server retrieves the requested group information based on the query type.
Step 3.
The group management server sends a group information query response including the retrieved group information to the group management client.
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10.3.5  Group membershipp. 76

10.3.5.1  Group membership notificationp. 76

Figure 10.3.5.1-1 illustrates the group membership notification operations to the VAL server(s) and group management clients upon the group membership change at group management server.
Pre-conditions:
  1. VAL group is created on the group management server.
Reproduction of 3GPP TS 23.434, Fig. 10.3.5.1-1: group membership notification
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Step 1.
The membership of a specific VAL group is changed at group management server.
Step 2.
The group management server notifies the VAL server(s) regarding the group membership change with the information of the updated group members.
Step 3.
The group management server updates the group management clients of the VAL users/UEs who have been added to or removed from the group.
Step 4.
The group management client requests to retrieve the relevant group configurations from group management server, if the user or UE is added to the group. If the user or UE is deleted from the group, the locally stored group configurations in the VAL UE may be removed.
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10.3.5.2  Group membership update by authorized user/UE/VAL serverp. 77

Figure 10.3.5.2-1 below illustrates the group membership update operations by an authorized user/UE/administrator/VAL server to change the membership of a VAL group (e.g. to add or delete group members).
Pre-conditions:
  1. The group management server and VAL server serve the same VAL system;
  2. The initiator of this operation is aware of the current group membership of the VAL group;
  3. The authorized user/UE/administrator/VAL server is aware of the users' identities which will be added to or deleted from the VAL group.
Reproduction of 3GPP TS 23.434, Fig. 10.3.5.2-1: Group membership update by authorized user/UE/VAL server
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Step 1.
The group management client of the authorized user/UE/administrator or VAL server requests group membership update operation to the group management server.
Step 2.
The group management server updates the group membership information. The group management server may perform the check on policies e.g. the maximum limit of the total number of VAL group members.
Step 3.
The group management server notifies the VAL server(s) regarding the group membership change with the information of the updated group members.
Step 4.
The group members that are added to or deleted from the group by this operation are notified about the group membership change. This step may be followed by retrieving group configurations.
Step 5.
The group management server provides a group membership response to the group management client of the authorized user/UE/administrator or the VAL server.
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10.3.6  Group configuration managementp. 78

10.3.6.1  Store group configurations at the group management serverp. 78

The procedure for store group configurations at the group management server is described in Figure 10.3.6.1-1.
Pre-conditions:
  • The group management server may have some pre-configuration data which can be used for online group configuration validation;
Reproduction of 3GPP TS 23.434, Fig. 10.3.6.1-1: Store group configurations at group management server
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Step 1.
The group configurations are received by the group management client of an authorized user/UE or VAL server.
Step 2.
The received group configurations are sent to the group management server for storage using a store group configuration request.
Step 3.
The group management server may validate the group configurations before storage.
Step 4.
The group management server stores the group configurations.
Step 5.
The group management server provides a store group configuration response indicating success or failure. If any validation or storage fails, the group management server provides a failure indication in the store group configuration response.
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10.3.6.2  Retrieve group configurationsp. 79

The procedure for retrieve group configurations at the group management client or the VAL server is described in Figure 10.3.6.2-1. This procedure can be used following service authorisation when the configuration management client has received the list of groups and the group management client needs to obtain the group configurations, or following a notification from the group management server that new group configuration information is available.
Pre-conditions:
  • The group management server has received configuration data for groups, and has stored this configuration data;
  • The VAL UE has registered for service and the group management client or the VAL server needs to download group configuration data applicable to the user/UE.
Reproduction of 3GPP TS 23.434, Fig. 10.3.6.2-1: Retrieve group configurations
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Step 1.
The group management client or the VAL server requests the group configuration data.
Step 2.
The group management server provides the group configuration data to the client or the VAL user.
Step 3.
The group management client or the VAL server stores the group configuration information.

10.3.6.3  Subscription and notification for group configuration datap. 80

The procedure for subscription for group configuration data as described in Figure 10.3.6.3-1 is used by the group management client to indicate to the group management server that it wishes to receive updates of group configuration data for groups for which it is authorized.
Pre-conditions:
  • The group management server has some group configurations stored.
Reproduction of 3GPP TS 23.434, Fig. 10.3.6.3-1: Subscription for group configurations
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Step 1.
The group management client subscribes to the group configuration information stored at the group management server using the subscribe group configuration request.
Step 2.
The group management server provides a subscribe group configuration response to the group management client indicating success or failure of the request.
The procedure for notification of group configuration data as described in Figure 10.3.6.3-2 is used by the group management server to inform the group management client that new group configuration data is available. It can also be used by the group management server to provide new group related key material to the group management client.
Pre-conditions:
  • The group management client has subscribed to the group configuration information
  • The group management server has received and stored new group configuration information, or the group management server has generated and stored new key material, or both of these have occurred.
Reproduction of 3GPP TS 23.434, Fig. 10.3.6.3-2: Notification of group configurations
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Step 1.
The group management server provides the notification to the group management client, who previously subscribed for the group configuration information. Optionally, the notify group configuration request may contain group related key material for the group management client.
Step 2.
The group management client provides a notify group configuration response to the group management server.
Step 3.
If the group management server had provided group related key material to the group management client, the group management client stores the key material.
If the group management server has notified the group management client about new group configuration information through this procedure, the group management client may then follow the procedure described in subclause 10.3.6.2 in order to retrieve that group configuration information.
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10.3.6.4  Structure of group configuration datap. 81

The group configuration data contains group configuration data common to all VAL services and group configuration data specific to each VAL service.

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