Question: For OTDOA (Observed Time Difference of Arrival) Positioning Support in NG-RAN, how can an LMF (Location Management Function) obtain location-related information, such as timing details for Transmission Points (TPs), from the radio access network?
Option 1: Directly via a dedicated interface between the LMF and all ng-eNBs/gNBs without intermediate nodes.
Option 2: Through a specific AMF (Access and Mobility Management Function) designated for positioning services, which alone interacts with both LMF and ng-eNB/gNB.
Option 3: Via any AMF that has signalling access to both the LMF and the targeted ng-eNB or gNB, facilitating flexible network architecture.
Option 4: By querying a centralized database that stores all NG-RAN cell and TP timing information, updated periodically by ng-eNBs/gNBs.
Explanation: This option correctly reflects the flexibility and scalability of the NG-RAN architecture for positioning support. Allowing any AMF with signalling access to both the LMF and the ng-eNB/gNB to facilitate the exchange enables efficient use of network resources and supports a wide range of deployment scenarios, ensuring that OTDOA positioning can be effectively supported whether the UE is served by an E-UTRA or NR cell.