Question: In a Next Generation Radio Access Network (NG-RAN), what parameters does the Uplink Angle of Arrival (UL-AoA) positioning method primarily utilize from measurements at multiple Reception Points (RPs) to estimate a User Equipment's (UE) location?
Option 1: Downlink Signal Strength and UE Transmission Power
Option 2: Azimuth Angle of Departure (A-AoD) and Zenith Angle of Departure (Z-AoD)
Option 3: Uplink Shared Channel (UL-SCH) Throughput and Scheduling Request Periodicity
Option 4: Azimuth Angle of Arrival (A-AoA) and/or Zenith Angle of Arrival (Z-AoA)
Explanation: The UL-AoA positioning method in NG-RAN relies on the precise measurement of signal arrival angles at multiple points to triangulate the UE's location. Specifically, it utilizes the Azimuth Angle of Arrival (A-AoA), which indicates the horizontal direction from which a signal arrives, and/or the Zenith Angle of Arrival (Z-AoA), indicating the vertical angle, to accurately estimate the UE's position. These angles, measured at RPs for uplink signals transmitted by the UE, are crucial for determining the device's location in the network.