Question: In OTDOA (Observed Time Difference of Arrival) positioning for User Equipment (UE) in NG-RAN, what is primarily utilized from multiple Transmission Points (TPs) to determine the UE's location?
Option 1: Signal Strength (RSSI) measurements from ng-eNBs and eNBs
Option 2: Uplink transmission latency to PRS-only TPs and ng-eNBs
Option 3: Downlink data throughput from neighboring TPs
Option 4: Measured timing of downlink signals from multiple TPs (including eNBs, ng-eNBs, and PRS-only TPs)
Explanation: OTDOA positioning relies on the principle of measuring the time difference in receiving downlink signals from multiple known locations. By analyzing these time differences, the UE's location can be triangulated. This method does not primarily depend on signal strength, uplink latency, or data throughput but rather on the timing of received downlink signals.