Question: In NR Enhanced Cell ID (NR E-CID) positioning, which of the following measurement types is NOT applicable for downlink NR E-CID positioning methods when considering inter-RAT measurements?
Option 1: SS Reference Signal Received Power (SS-RSRP)
Option 2: E-UTRA Reference Signal Received Quality (RSRQ)
Option 3: CSI Reference Signal Received Power (CSI-RSRP)
Option 4: E-UTRA Reference signal received power (RSRP) for downlink NR E-CID positioning
Explanation: According to the provided context, E-UTRA measurements (including RSRP) by the UE are only used for Uplink NR E-CID positioning. This implies that for downlink NR E-CID positioning methods, these specific inter-RAT E-UTRA measurements (like RSRP) are not applicable. The other options (SS-RSRP and CSI-RSRP) are directly related to NR measurements which can be used in both uplink and downlink scenarios for NR E-CID positioning.