Question: Under what circumstances does the eNodeB (eNB) initiate the Uplink Positioning Information Update Procedure to inform the E-SMLC in an E-UTRAN?
Option 1: When the UE's SRS transmission configuration changes for one or more cells, or when a handover of the target UE is triggered.
Option 2: Only when the UE transitions from idle to connected mode, requiring an update of its location.
Option 3: Whenever the E-SMLC requests a periodic update of all UEs' positioning information within the eNB's coverage area.
Option 4: Exclusively in response to a change in the UE's QoS requirements, impacting its SRS transmission needs.
Explanation: The correct answer is Option 1 because the eNB initiates the Uplink Positioning Information Update Procedure either when there is a change in the UE's SRS transmission configuration for one or more cells (indicating an update is necessary for accurate positioning) or when a handover of the target UE is triggered (ensuring continuity and accuracy of positioning information during mobility events).