Question: What is the primary purpose of a downlink physical signal in E-UTRA?
Option 1: To carry information originating from higher layers.
Option 2: To provide reference and synchronization for the physical layer.
Option 3: To transmit data to multiple users simultaneously.
Option 4: To perform handovers between different base stations.
Explanation: Downlink physical signals, such as Reference signal, Synchronization signal, Discovery signal, and MTC wake-up signal (MWUS), are used by the physical layer for various purposes like channel estimation, synchronization, and discovery, but they do not carry information originating from higher layers.