Question: In E-UTRAN, which of the following barometric pressure sensor positioning modes involves the UE calculating its vertical position without any assistance from the network?
Option 1: UE-Assisted
Option 2: UE-Based
Option 3: Standalone
Option 4: Hybrid (Combination of Network and UE)
Explanation: The correct answer is Option 3, Standalone. In Standalone mode, the UE performs barometric pressure sensor measurements and calculates its own vertical component of the position without relying on assistance from the network, distinguishing it from UE-Assisted and UE-Based modes which may or may not involve network assistance for calculation or additional data. Hybrid is not a listed mode in the provided context, making Standalone the correct choice for no network assistance.