The group management client or the VAL server requests location-based group create operation to the group management server. The location criteria for determining the identities of the users or UEs to be combined shall be included in this message and the location criteria may be the VAL service area identified by the VAL service area ID.
The group management server requests the location management server for obtaining the users or UEs corresponding to the location information or the VAL service area identified by the VAL service area ID.
The group management server receives the composed list of users or UEs from the location management server. The location management server may include VAL service IDs associated with the list of users or UEs.
During the group creation, the group management server creates and stores the information of the location-based 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). If an external group identifier, identifying the member UEs of the VAL group at the 3GPP core network is available, then the external group ID is stored in the newly created VAL group's configuration information. If VAL service ID list was received in step 1 as part of group formation criteria and not in step 4 for the composed list of users or UEs, the group management server shall retrieve the VAL service data from the configuration management server as described in clause 188.8.131.52 and form the group with relevant users or UEs.
The VAL server determines group information and the identity list to which the group announcement shall be sent. The decision can be based on the list of authorized UEs and other criteria (e.g. user consent, service, or vehicle driving profile).
The group management server creates an empty group based on the information provided in the Configure VAL group request. The group management server stores the mapping between the VAL group ID and the external Group Id in the VAL group document, along with a list of GPSIs corresponding to the identity list provided by the VAL server. The group management server also determines whether the group is for 5G LAN-Type communication and whether Ethernet or IP (IPv4 and/or IPv6) transport shall be used for the 5G LAN-Type communication.
If 5G LAN-Type communication is to be used, the group management server creates a 5GVN group in the 5GS via N33 using the create group procedure specified in clause 5.29.2 of TS 23.501 and clause 4.15.6 of TS 23.502. The group management server creates the 5GVN group data and the 5GVN group membership data defined in clause 184.108.40.206b of TS 23.502 to be configured in the 5GS. To create the 5GVN group data the group management server uses the 5G LAN-Type communication type information provided by the VAL server to set the PDU session type (Ethernet or IP) and maps the VAL service IDs to Application descriptors. To create the 5GVN group membership data the group management server maps the VAL group ID to the External Group ID and makes a list of GPSIs corresponding to the identity list provided by the VAL server.
The group management server announces the VAL group to the group management clients. For a 5GVN group the announcement includes the communication type (IP or Ethernet), DNN, and S-NSSAI corresponding to the 5GVN group.
The group management server sends identity list notification about the newly registered users to the other members of the group and VAL server, whose subscription to receive notifications of newly registered VAL UE IDs is successful in step 8 and step 9 respectively.
The group management server sends identity list notification about the leaving registered user to the other members of the group and the VAL server, whose subscription to receive notifications of de-registered VAL UE IDs is successful in step 7 and step 8 of the procedure in clause 10.3.8.2 respectively.