Figure 6.1.3-1 illustrates an extension procedure of 5GC-MT-LR procedure for the regulatory location service defined in
clause 6.1.1.
This procedure is applicable for providing multiple location estimates of the target UE to LCS client.
Step 1.
Steps 1-7 for 5GC-MT-LR procedure for the regulatory location service
clause 6.1.1 are performed with the following differences:
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At step 1 in clause 6.1.1 the request from external location services client may include acceptance of INTERMEDIATE response and maximum response time.
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At step 4 in clause 6.1.1 Namf_Location_ProvidePositioningInfo service operation invoked by GMLC may include the acceptance of INTERMEDIATE response and maximum response time, GMLC contact address and LIR reference number. The LIR reference number is allocated by GMLC based on predefined rule.
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At step 7 in clause 6.1.1 Nlmf_Location_DetermineLocation service operation invoked by AMF may include additionally include acceptance of INTERMEDIATE response and maximum response time, GMLC contact address, LIR reference number for the INTERMEDIATE response. AMF can overwrite maximum response time to avoid timeout.
Step 2.
LMF performs positioning procedures and determines multiple location estimates during the session.
Step 2.1.
This step is executed if the INTERMEDIATE result is available. The LMF invokes an Nlmf_Location_EventNotify service operation towards GMLC and provides the INTERMEDIATE location of the UE during the session and timestamp of the location estimate, and LIR reference number, and INTERMEDIATE event type.
Step 2.2.
This step is executed if step 2.1 was executed. The GMLC sends the INTERMEDIATE location of the UE and timestamp of the location estimate to external location services client.
Step 3.
Based on step 9 in
clause 6.1.1 the LMF returns the
Nlmf_Location_DetermineLocation Response towards the AMF to return the FINAL location of the UE. LMF ensures that FINAL location will be transferred towards AMF within the maximum response time.
Step 4.
Steps 10-11 for 5GC-MT-LR procedure for the regulatory location service
clause 6.1.1 are performed with the following differences:
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At step 11 the FINAL location is sent from GMLC to LCS client.