Question: In an E-UTRAN access scenario, which of the following functions is NOT directly supported by the MME for enabling MBMS support?
Option 1: Session control of MBMS bearers to the E-UTRAN access
Option 2: Transmit Session control messages towards multiple E-UTRAN nodes
Option 3: Handling service continuity when a UE leaves or enters MBMS bearer coverage
Option 4: Direct transmission of MBMS data to UEs without involving the MBMS GW function
Explanation: According to the provided context, the MME supports various functions for enabling MBMS in E-UTRAN access, including session control and transmitting session control messages. However, direct transmission of MBMS data to UEs without involving the MBMS GW function is not listed among these supported functions. Instead, the MME provides an Sm interface to the MBMS GW function for receiving MBMS service control messages and IP Multicast addresses, indicating that data transmission involves the MBMS GW. Additionally, handling service continuity (Option 3) is mentioned as a responsibility of the Service Layer, not the MME’s direct function in this context, but since it was not explicitly listed as an MME function for MBMS support, Option 4 remains the most accurate answer based on the question’s criteria.