Question: What triggers an eNode B to make measurements of radio signals for a target User Equipment (UE) in the context of UE positioning in E-UTRAN?
Option 1: Periodic self-initiated scans by the eNode B
Option 2: Receipt of location assistance data from another eNode B
Option 3: Requests received from the E-SMLC (Evolved Serving Mobile Location Centre), which can be either on demand or periodic
Option 4: Configuration updates from the UE itself
Explanation: In the context of E-UTRAN positioning, the eNode B plays a crucial role in measuring radio signals for target UEs. These measurements are not initiated by the eNode B autonomously (excluding periodic requests from E-SMLC) or due to interactions with other eNode Bs or the UE directly. Instead, the eNode B's measurement actions are responsive to external directives, specifically requests from the E-SMLC, which can be either one-time (on demand) or recurring (periodic), highlighting the E-SMLC's central role in orchestrating positioning processes.