Question: In NG-RAN, what additional measurements can optionally supplement SL-RSTD for the Sidelink Time Difference of Arrival (SL-TDOA) positioning method at the target UE?
Option 1: CSI-RSRP and CSI-RSRQ from the serving cell
Option 2: SL-PRS-RSRP and/or SL-PRS-RSRPP from peer UEs
Option 3: Handover-related RACH preamble measurements
Option 4: UE-reported DL signal strength from neighboring eNBs
Explanation: The correct answer is Option 2 because, according to the SL-TDOA positioning method principles in NG-RAN, besides the mandatory SL-RSTD measurements, the target UE can also optionally utilize SL-PRS-RSRP and/or SL-PRS-RSRPP from peer UEs to enhance location determination, improving the accuracy of determining the target UE's location relative to the known locations of peer UEs.