Question: In DL-AoD (Downlink Angle of Departure) positioning, what does a User Equipment (UE) primarily utilize from multiple Transmission Points (TPs) to determine its location?
Option 1: Uplink Signal Strength Indications (SSI) transmitted back to the TPs
Option 2: Measured Downlink Positioning Reference Signal Received Power (DL-PRS-RSRP) of received downlink signals
Option 3: Scheduling Request (SR) resources allocated by the TPs for positioning
Option 4: Random Access Channel (RACH) preambles specifically designed for location discovery
Explanation: In DL-AoD positioning, the UE's location is determined based on the angles of arrival at multiple TPs. To calculate these angles, the UE measures the power of downlink signals it receives from these TPs, specifically focusing on the Downlink Positioning Reference Signal Received Power (DL-PRS-RSRP). This measurement, possibly complemented by DL-PRS-RSRPP (if available), is crucial for triangulating the UE's position relative to the neighboring TPs.