Question: In UTRAN, how does the network notify an RRC connected UE about an additional MBMS session during an ongoing MBMS session?
Option 1: The SGSN sends a direct notification to the UE.
Option 2: The UTRAN's RNS notifies the UE based on the list of activated MBMS bearer services received from the SGSN.
Option 3: The UE periodically polls the network for updates on additional MBMS sessions.
Option 4: Notification is sent over the UE's dedicated channel, interrupting the ongoing session.
Explanation: This option correctly reflects the process. The SGSN shares the list of activated MBMS bearer services with the UTRAN, which then uses this information (via its RNS) to notify RRC connected UEs about additional MBMS sessions, ensuring efficient use of resources and targeted notification based on user subscriptions.