Content for  TR 33.854  Word version:  17.1.0

This solution addresses Key Issue 4 to support the location Information veracity. USS/UTM requests the location service to 5GS with a requirement of high reliability. If the network-assisted positioning method as defined in clause 6.11.2 in TS 23.273 is chosen, the location result will not depend on the UE's report. The location result from 5GS can be utilized to verify the location information which is reported from UE side.

5GS already provides the location service (LCS). Location information for one or multiple target UEs may be requested by and reported to an LCS client or an AF within or external to a PLMN. The procedure of the location information veracity can be described as follows:

1. USS/UTM receives the location information which is reported by UE via the application layer. If UTM/USS decides to check and verify the location information, UTM/USS sends a request to the GMLC for a location and optionally a velocity for the target UE which may be identified by a GPSI. The LCS request also carries the requirement of high reliability, which indicates the 5GS to select the positioning method which is not based on the UE's report.
2. GMLC continues with the location service procedure as defined in clause 6.1.2 in TS 23.273 and indicates LMF to select Network Assisted Positioning method. Network Assisted Positioning method relies on the location measurement from NG-RAN nodes.
3. The LMF invokes the Namf_Communication_N1N2MessageTransfer service operation towards the AMF to request the transfer of a Network Positioning message to a NG-RAN node (gNB or ng-eNB) in the NG-RAN. The target NG-RAN node obtains and returns the position related information.
4. The LMF calculates the location result and responds to GMLC.
5. USS/UTM acquires the location information from GMLC and verifies the information from the application layer. USS/UTM may make decisions to control the UAV/UAVC based on the verification result.

This solution fulfils the requirement in Key Issue 4. The solution reuses the existing location service provided by 5GS. The Network Assisted Positioning method can be regarded as trusted as it does not rely on the UE's report. Based on the result of the verification, USS/UTM may make decisions to control the corresponding UAV/UAVC.