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Content for  TS 23.280  Word version:  18.1.0

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10.9.3  ProcedureWord‑p. 188

10.9.3.1  Event-triggered location reporting procedureWord‑p. 188

The location management server provides location reporting configuration to the location management clients, indicating what information the location management server expects and what events will trigger the sending of this information to the location management server. The decision to report location information can be triggered at the location management client by different conditions. The conditions could include, for example, the reception of the location reporting configuration, initial registration, distance travelled, elapsed time, cell change, MBMS SAI change, MBMS session change, leaving a specific MBMS bearer service area, tracking area change, PLMN change, call initiation, or other types of events such as emergency alert, emergency call or imminent peril calls. The location report can include information described as time of measurement, accuracy, longitude, latitude, speed, bearing, altitude, ECGI, MBMS SAIs.
Copy of original 3GPP image for 3GPP TS 23.280, Fig. 10.9.3.1-1: Event-triggered location reporting procedure
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Step 1.
The location management server sends location reporting configuration message to the location management client(s) containing the initial configuration (or a subsequent update) for reporting the location of the MC service UE. This message can be sent over a unicast bearer to a specific location management client or as a group message over an MBMS bearer to update the location reporting configuration for multiple location management clients at the same time.
Step 2.
A location reporting event occurs, triggering step 3.
Step 3.
The location management client sends a location information report to the location management server, containing location information identified by the location management server and available to the location management client.
Step 4.
Upon receiving the report, the location management server updates location of the reporting location management client. If the location management server does not have location information of the reporting location management client before, then just stores the reporting location information for that location management client. If the location information report contains an optional MC service UE label, the location management server stores it together with the location information for the reporting location management client.
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10.9.3.2  On-demand location reporting procedureWord‑p. 189

The location management server can request MC service UE location information at any time by sending a location information request to the location management client, which may trigger location management client to immediately send the location report.
Copy of original 3GPP image for 3GPP TS 23.280, Fig. 10.9.3.2-1: On-demand location information reporting procedure
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Step 1.
Based on configurations such as periodical location information timer, or location information request from other entities (e.g., another location management client, MC service server), location management server initiates the immediate request of location information to be sent from the location management client.
Step 2.
The location management server sends a location information request to the location management client.
Step 3.
MC service user is notified and asked for permission to share location information. MC service user can accept or deny the request.
Step 4.
The location management client immediately responds to the location management server with a report containing location information identified by the location management server and available to the location management client.
Step 5.
Upon receiving the report, the location management server updates location of the reporting location management client. If the location management server does not have location information of the reporting location management client, the location management server just stores the reporting location information for that location management client. If the location information report contains an optional MC service UE label, the location management server stores it together with the location information for the reporting location management client.
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10.9.3.3  Client-triggered location reporting procedureWord‑p. 189

Figure 10.9.3.3-1 illustrates the high level procedure of client-triggered location reporting.
Copy of original 3GPP image for 3GPP TS 23.280, Fig. 10.9.3.3-1: Client-triggered location reporting procedure
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Step 1.
Location management client 2 (authorized MC service user) sends a location reporting trigger to the location management server to activate a location reporting procedure for obtaining the location information of location management client 1.
Step 2.
Location management server checks whether location management client 2 is authorized to send a location reporting trigger. Depending on the information specified by the location reporting trigger, location management server initiates an on-demand location reporting procedure or an event-triggered location reporting procedure for the location of location management client 1.
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10.9.3.4  Location reporting cancel procedureWord‑p. 190

The location reporting cancel procedure reuses the information flow of location reporting configuration.
Pre-conditions:
  • The location management client has been provided with location reporting configuration information.
Copy of original 3GPP image for 3GPP TS 23.280, Fig. 10.9.3.4-1: Location reporting cancel procedure
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Step 1.
The location management server sends location reporting configuration without any information element to the location management client to stop location reporting from the MC service UE.
Step 2.
The location management client stops sending location information reports to the location management server.

10.9.3.5  Location information subscription procedureWord‑p. 191

Figure 10.9.3.5-1 illustrates the high level procedure of location information subscription request. The same procedure can be applied for location management client and other entities that would like to subscribe to MC service user location information.
Copy of original 3GPP image for 3GPP TS 23.280, Fig. 10.9.3.5-1: Location information subscription request procedure
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Step 1.
MC service server or location management client sends a location information subscription request to the location management server to subscribe location information of one or more MC service users.
Step 2.
The location management server checks if the location management client is authorized to initiate the location information subscription request.
Step 3.
The location management server replies with a location information subscription response indicating the subscription status.
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10.9.3.6  Usage of location information procedureWord‑p. 191

10.9.3.6.1  Event-trigger location information notification procedureWord‑p. 191
Figure 10.9.3.6.1-1 illustrates the high level procedure of event-trigger usage of location information. The same procedure can be applied for location management client and other entities that would like to subscribe to location information of MC service user.
Pre-condition:
  1. The MC service server or location management client has subscribed to the location information of a target MC service user.
Copy of original 3GPP image for 3GPP TS 23.280, Fig. 10.9.3.6.1-1: Event-trigger usage of location information procedure
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Step 1.
Based on configuration, e.g., subscription, periodical location information timer, the location management server is triggered to report the latest user location information of the target MC service user to the subscribed MC service server or subscribed location management client.
Step 2.
The location management server sends the location information notification including the latest location information of one MC service user to the MC service server or to the location management client. The latest location information is derived from the location report procedure as described in clause 10.9.3.1, or from PLMN operator (e.g. LCS network).If the optional MC service UE label is present, the location management server sends it, as part of the location information notification, to the MC service user.
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10.9.3.6.2  On-demand usage of location information procedureWord‑p. 192
The MC service server or the location management client can request location information at any time by sending a location information request to the location management server, which may trigger location management server to send the location information report immediately.
Figure 10.9.3.6.2-1 illustrates the high level procedure of on-demand usage of location information. The same procedure can be applied for other entities that would like to subscribe to location information at the location management server of an MC service user.
Copy of original 3GPP image for 3GPP TS 23.280, Fig. 10.9.3.6.2-1: On-demand usage of location information procedure
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Step 1.
MC service server or location management client send a location information request to the location management server.
Step 2.
The location management server checks if the location management client is authorized to request the location information.
Step 3.
The location management server acquires the latest location of the MC service clients being requested, by triggering an on-demand location report procedure as described in clause 10.9.3.2, or from PLMN operator (e.g. LCS network).
Step 4.
Then, location management server immediately sends the location information report including the latest location information acquired of one MC service user to the MC service server or to the location management client. If the optional MC service UE label is present, the location management server sends it, as part of the location information report, to the MC service user.
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10.9.3.7  Location information cancel subscription procedure |R16|Word‑p. 192

Figure 10.9.3.7-1 illustrates the high level procedure of location information cancel subscription request. The MC service server or the location management client can request the cancellation of location information subscriptions at any time from the location management server.
Pre-conditions:
  • The authorized MC service user is in possession of the MC service ID of the MC service user as well as the location information subscriptions of this MC service ID.
Copy of original 3GPP image for 3GPP TS 23.280, Fig. 10.9.3.7-1: Location information cancel subscription request procedure
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Step 1.
MC service server or location management client sends a location information cancel subscription request to the location management server to cancel the subscription for location information of one or more MC service users.
Step 2.
The location management server checks the authorization of this request.
Step 3.
The location management server replies with a location information cancel subscription response indicating the cancel subscription status.
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