Content for  TS 23.280  Word version:  19.4.0

Figure 10.2.6.1-1 illustrates the group membership notification operations to the MC service server(s) and group management clients upon the group membership change at group management server. Pre-conditions:

1. The group management server and MC service server serve the same MC system.

Figure 10.2.6.2-1 below illustrates the group membership update operations by an authorized user/administrator/dispatcher to change the membership a MC service group (e.g. to add or delete group members). Pre-conditions:

1. The group management server and MC service server serve the same MC system;
2. The initiator of this operation is aware of the current group membership of the MC service group;
3. The Administrator/dispatcher/authorized user is aware of the users' identities which will be added to or deleted from the MC service group.

The procedures in the following subclauses describe the process for sharing group configuration from a primary MC system of the MC service group to an interconnected partner MC system of the MC service group where MC service clients receiving MC service in the partner MC system of the MC service group need to make use of the MC service group. The group management server in the primary MC system of the MC service group provides group configuration information to the group management server in the partner MC system of the MC service group. The group management server in the primary MC system of the MC service group may modify the configuration before providing it to that partner MC system in accordance with policies and requirements within the primary MC system (for example the list of members of the group within the primary MC system or within other partner MC systems might not be exposed to that partner system). The means by which the group management server in the primary system determines which configuration parameters are changed is outside the scope of the present document. The group management server in the partner MC system of the MC service group may modify the configuration before storing it in accordance with policies and requirements within that MC system (for example the priority of the group within that partner MC system, or permitted locations for service within that partner MC system). The group management server in the partner MC system of the MC service group will be the source of group configuration information to the group management clients of any MC service user who is receiving MC service in the partner MC system of the MC service group and who is defined as a member of the MC service group. The list of groups in the user profile for those group members in the partner MC system of the MC service group will contain the address of this group management server in the partner MC system of the MC service group as the address of the server from which to obtain the MC service group configuration for this MC service group. The procedures in the following subclauses describe the cases where the provision of configuration information is initiated by the group management server in the primary MC system of the MC service group, and where the configuration is requested by the group management server in the partner MC system of the MC service group. There may be additional proxy servers in between the two group management servers on the edges of one or both MC systems so that each group management server is not aware of the network topology of the other MC system. These additional proxy servers are not shown in these procedures.

Figure 10.2.7.2-1 below illustrates the case where the primary MC system of the MC service group provides the group configuration to the partner MC system of the MC service group, e.g. due to an action by an administrator or because the primary MC system of some of the MC service group members is the partner MC system of the MC service group. Preconditions

• The MC service group is defined in its primary MC system.
• One or more MC service group members are defined in the partner MC system.
• The primary MC system of the MC service group has been configured with addressing information for the group management server in the partner MC system of the MC service group.
• The primary MC system of the MC service group is authorized to provide group configuration information to the partner MC system of the MC service group.

Figure 10.2.7.3-1 below illustrates the case where the partner MC system of the MC service group requests the group configuration from the primary MC system of the MC service group, for example because an MC service user receiving service in the partner MC system of the MC service group has the group configured in the user profile. Preconditions

• The MC service group is defined in its primary MC system.
• The MC service group is configured in the MC service user profiles of one or more MC service users in the partner MC system of the MC service group.
• At least one of the MC service users in the partner MC system of the MC service group that is listed as an MC service group member of the MC service group has become MC service authorized with the MC service server in the partner MC system of the MC service group.
• The group management server in the partner MC system of the MC service group does not have the configuration for the MC service group stored.
• The partner MC system of the MC service group has been configured with addressing information for the group management server in the primary MC system of the MC service group.
• The partner MC system of the MC service group is authorized to request group configuration information from the primary MC system of the group.

The procedure for subscription from the group management server in the partner system for group configuration information to the group management server in the primary MC system of the MC service group is shown in Figure 10.2.7.4-1. Pre-conditions:

• The MC service group is defined in its primary MC system.
• One or more MC service group members are defined in the partner MC system.
• The GMS in the partner MC system of the MC service group has received group configuration information from the GMS in the primary MC system of the MC service group.

The procedure for notification of group configuration information from the group management server in the primary MC system of the MC service group to the group management server in the partner MC system of the MC service group is shown in Figure 10.2.7.5-1. Pre-conditions:

• The group management server in the partner MC system of the MC service group has subscribed to the group configuration information for the MC service group in the group management server in the primary MC system of the MC service group.
• The group management server in the primary MC system of the MC service group has received and stored new group configuration information for the MC service group, or the group management server in the primary MC system of the MC service group has generated and stored new key material, or both of these have occurred.

Following completion of the notification procedure, the group management server in the partner MC system of the MC service group stores the group configuration information and any key material provided.