Question: In UL-AoA (Uplink Angle of Arrival) positioning in NG-RAN, what triggers the User Equipment (UE) to transmit Sounding Reference Signals (SRS) for uplink positioning measurements?
Option 1: The UE autonomously decides to transmit SRS based on its location needs.
Option 2: The Location Management Function (LMF) directly instructs the UE to transmit SRS signals.
Option 3: The gNB (next-generation Node Base) directs the UE to transmit SRS signals after being informed by the LMF of the need for uplink positioning measurements.
Option 4: TRPs (Transmission Reception Points) independently request UEs to send SRS for positioning purposes.
Explanation: In UL-AoA positioning, the Location Management Function (LMF) identifies the need for uplink measurements and informs the serving gNB. The gNB then decides on resource allocation for the UE to transmit SRS signals, crucial for uplink positioning measurements at TRPs, ensuring efficient resource use and accurate positioning.