Question: What is the primary purpose of the transport channels used by the Medium Access Control (MAC) protocol in E-UTRA?
Option 1: To manage the transmission of control signals between eNodeBs.
Option 2: To facilitate the exchange of user data between User Equipment (UE) and the network.
Option 3: To provide a mechanism for handover procedures between different cells.
Option 4: To define the mapping of logical channels to physical resources in the E-UTRA air interface.
Explanation: The transport channels used by MAC are responsible for defining how logical channels, which carry user data and control signals, are mapped onto physical resources such as resource blocks and modulation schemes. This is essential for efficient transmission of data over the E-UTRA air interface.