The VAL server sends Monitor Location Subscription Request to LMS server including VAL UE Identifier, predetermined area of interest information, notification interval and notification URI where the VAL server intends to receive the notifications from LMS server regarding VAL UE's presence in a given area.
"Area of interest" is the location information, which the VAL server wishes to monitor the VAL UE's location adherence. This parameter can include an area of interest information and other relevant parameters.
"Notify_Interval" represents the periodic interval in which the LMS server needs to notify VAL UE's location information to the VAL server. When the VAL UE moves away from the "Area of interest", then the LMS server ignores the "Notify_Interval" and sends the location notification to the VAL server immediately.
LMS processes the Area of interest information in the request, and then subscribes to UE location monitoring as specified in TS 23.502
with appropriate parameters mapping. Based on the subscription, the LMS receives the VAL UE location information periodically from the 3GPP core network.
LMS shall use the Location information procedures as specified in clause 9.3.7
and clause 9.3.10
, to periodically obtain the VAL UE location information. Based on the geographic information from the VAL server, the LMS server may determine to additionally include the positioning methods in SEAL LMS procedures to obtain location information.
LMS server, after successful subscription according to steps 2 and 3, sends Monitor Location Subscription response, indicating that the LMS server accepts VAL server's request and will monitor the location of the VAL UE to verify if the VAL UE is in the area of interest.
Step 5a and 5b.
LMS server processes the location information received from SEAL Location Information procedures and the core network, and validates the information. If the location information is matching, then the LMS shall check if the VAL UE's current location is within the area of interest received in step 1. The UAE server will continue with step 6, step 7 and step 8 as applicable.
If the location information received from Location management client and the core network do not match, then the LMS server shall consider the VAL UE as outside from its specified area of interest and shall notify ("Notify Mismatch Location" message) the VAL server of the same, including VAL UE ID and the location information from LMS and the core network in the notification message.
If the VAL UE's current location is from Location management client and the core network matches, and not in the area of interest received from VAL server in Monitor Location Subscription Request message, then the LMS considers the VAL UE as outside from its specified area of interest and shall notify the VAL server that the VAL UE's current location is outside of area of interest and VAL UE ID in "Notify Absence" message.
When the VAL UE's current location is in area of interest, then the LMS shall notify ("Notify Presence" message) the VAL server periodically, according to the "Notify_Interval" value in "Monitor Location Subscription Request" message, indicating the VAL server that the VAL UE is within the area of interest, along with VAL UE's current location information.