Question: In Enhanced Cell ID (E-CID) positioning for E-UTRAN access, which of the following measurement types is **NOT** solely a UE measurement as per the listed options?
Option 1: Reference Signal Received Power (RSRP)
Option 2: eNB Rx – Tx time difference
Option 3: UE Rx – Tx time difference
Option 4: Angle of Arrival (AoA)
Explanation: Enhanced Cell ID positioning utilizes both UE and E-UTRAN measurements. Among the provided options, "eNB Rx – Tx time difference" is categorized as an E-UTRAN measurement, specifically related to the eNodeB (eNB) rather than being a measurement taken solely by the User Equipment (UE). This distinguishes it from the other options listed, which are either directly measured by the UE or involve UE-related calculations.